Sonic Imagery Labs 252AP Discrete OpAmp API2520 drop-in upgrade replacement

Brand: API, Universal Sold By: TopSelected
$168.18 In Stock
Ships from United States Arrives in 7-14 business days
Item can be returned in its original condition for a full refund or replacement within 30 days of receipt.
Delivery:
15
July2026
-
24
July2026
delivery Delivery Guarantee arrow
check$5 Credit If Delayed
checkFull Refund If Item Is Damaged
check15-Day Full Refund If No Updates
check30-Day Full Refund If Not Delivered
Sonic Imagery Labs 252AP Discrete OpAmp API2520 drop-in upgrade replacement

Sonic Imagery Labs 252AP Discrete OpAmp API2520...

$168.18

Product Details
DESCRIPTION:

Model 252AP Discrete Operational Amplifier
No other Discrete Op-Amp on the market comes even close to our fully tested specifications.
This auction is for Qty(1) Brand New! Fully tested and assembled discrete opamp, ready to drop in and go!

This unit is available with 2 pin lengths, Standard 0.30" long or Retro/Vintage 0.50" long, Let us know at time of purchase which pin length you want. See Application Note AN-18 for more details.

Height, Pin Length OPTION's and socketing dimensions for both standard product and retro-clone or vintage upgrades.


General Description:
Model 252AP Discrete Operational Amplifier

The Sonic Imagery Labs Model 252AP is a high performance discrete operational amplifier designed for professional audio applications and areas where ultralow noise and low distortion is required. The 252AP is best suited for use in circuits with medium to high source impedances and with microphone input transformers with high turns ratios (> 1:4). The Model 252AP is a modern re-engineering and redesign of the classic 2520 discrete op-amp. It was designed as an enhanced higher performance upgrade replacement with a focus on superior AC and DC performance. The pinouts conform to the 2520/990 package, allowing direct replacement.

The all-discrete SMT design is similar to the API2520 basic topology but has been redesigned to use an ultra-precision differential super-matched input transistor pair specifically designed to meet the requirements of ultra-low noise and ultra-low THD audio systems. A variant (252AP-ULN) is also available for ultra damn low noise applications. (0.560nV/rtHz at 1kHz) Unlike the original API2520 design, the 252AP can incorporate two precision matched pair transistors as the differential input stage. A total of 4 matched devices, for ultra-ultra low noise applications. These devices are selected by the manufacturer at final test to Sonic Imagery Labs noise, Vos, Ic and Vbe matching specifications.



DC perfomance is easily a magnitude better than previous counterparts. With an offset voltage of better than ±35uV (at Av1) and input leakage better than <30nA, the Sonic Imagery Labs Model 252AP is well suited for DC coupled audio applications in which output offset errors cannot be tolerated.

In addition to the enhanced input stage, and unlike the original API2520 devices, the Sonic Imagery Labs 252AP uses precision temperature stable power supply independent current sources. Supply independent current sources allow the bias of the input and matched pair differential VAS stage to remain locked at the optimum operating point regardless of power supply voltage.

Another feature not found in the original API2520 design is the addition of matched pair active current loads which gives the Model 252AP differential input and VAS stage it’s outstanding (PSRR) power supply noise rejection ratio performance.

The Sonic Imagery Labs 252AP can be operated from ±10V to ±25V power supplies. The redesigned input stage circuitry provides outstanding common-mode rejection and maintains low input bias current over its wide input voltage range, minimizing distortion. The 252AP is unity-gain stable and provides outstanding dynamic behavior over a wide range of load conditions.

Integrated power transistor heatsinks coupled to a anodized aluminum enclosure keeps the Sonic Imagery Labs 252AP operating within a wide safe operating area (SOA) and does not suffer from Beta droop when driving heavy loads. Each amplifier is individually fully tested and meets or exceeds published specifications.

Features:

• Ultra Low Total Harmonic Distortion, 0.0003 THD+N @ 1kHz
• Ultra Low Noise 0.92nV/rtHz typical@1Khz Rs=150 ohm
• High Current Output Drive (250mA peak)
• +28dBu Output Levels (into 600 ohms)
• Standard Gain Block Footprint
• Operates over ±10V to ±28V supply rails
• Much lower output offset voltage than existing counterparts
• Lower input leakage current than existing counterparts
• Particular emphasis on audio performance
• Designed, assembled and produced in the USA
• 3 Year Warranty

Applications:

• Low Impedance Line Amplifiers and Drivers
• Active Filters and Equalizers
• Summing/Mixer Amplifiers
• High Performance Microphone Preamplifiers
• High Performance A/D and D/A front end Preamplifier
• High Performance D/A I-V convertors
• High Current Buffer Amplifier


Specifications:

Height, Pin Length OPTION's and socketing dimensions for both standard product and retro-clone or vintage upgrades.

DOMESTIC SHIPPING AND HANDLING:
Shipping and handling charges: Items can be shipped First Class Parcel for $5.85 tracking or USPS Flat Rate Priority Mail for $10.20 with tracking.

INTERNATIONAL SHIPPING AND HANDLING:
USPS First Class International Parcel ---> for $19.70

USPS International Flat Rate Priority Mail ---> for $44.80

CANADA and MEXICO ships USPS International Flat Rate Priority Mail $31.45, customs tracking to the border. All other countries- Contact us directly if you would rather use your own FEDEX, DHL or UPS carrier account.

CONDITIONS OF SALE:
Please read our terms carefully. Failure to understand our terms and conditions will delay your shipment of your items.  All items are sold with a 14 day satisfaction, money back, guarantee. Payment is due within 10 business days of auction's end. 

PAYMENT INFO:
We accept Visa, Mastercard, American Express and Discover thru the eBay payment system. Payments from outside the US should be payable in US Dollars. 

See Also

Sonic Imagery Labs Model 992Enh-Ticha- Discrete Op Amp DIP8
Sonic Imagery Labs Model 994Enh-Ticha- Dual Discrete Op Amp DIP8
Sonic Imagery Labs Model 995FET-Ticha- FET Discrete Op Amp 990/2520
Sonic Imagery Labs Model 990Enh-Ticha- Discrete Op Amp 990/2520
Sonic Imagery Labs Model 312A VCA Module -Voltage Controlled Amplifier
 Sonic Imagery Labs Model 898B 16 Channel Level Translator -Balanced - Unbalanced Cable Driver

Contact us directly for OEM and quantity pricing.

Shipping Overview: 

• Shipping: Standard Domestic Shipping within the United States charges first item USD 6.99 and additional item USD 3.0 each. Standard International Shipping from United Kingdom, Germany, Italian and Japan to the United States charges first item USD 11.99 and additional item USD 4.0 each.

• Import Duty: Everymarket collects applicable duties and taxes on goods imported into the U.S. at checkout, it's calculated based on the goods value multiply by the rate. For United Kingdom and China goods is 10%, Germany, Italian and Japan goods is 15%. We are committed to making your U.S. shopping experience simple and transparent. The method of delivery—either Delivered Duty Paid (DDP) or Delivered Duty Unpaid (DDU)—depends on whether duties and taxes are collected at the time of your purchase.

• Order Processing: Please allow 1-2 business days for order processing and preparation before shipment. 

• Domestic Shipping: Orders within the U.S. are shipped via USPS or FedEx, depending on the origin of the product. Average transit times to the United States is 3 - 7 Business days and average transit times to International is 7 - 14 Business days 

• International Shipping: Currently, we only ship within the USA. 

• Tracking Information: Every order is trackable. You will receive a tracking number once your order has been shipped. Products may be shipped from various global fulfillment centers.

Shipping Delays: 

Please note that shipping times may vary due to factors beyond our control, such as weather conditions, natural disasters, or peak holiday periods. While we strive to ensure timely delivery, the exact arrival time cannot be guaranteed and is managed by the shipping carrier.

Shipping Options:

  • Standard Delivery: Most orders are shipped within 3-7 business days. Larger items may utilize LTL shipping for safe handling.

  • Handling Time: We handle shipments on business days (Monday - Friday), with a preparation time of 1-2 days.

  • Additional Charges: Some items require additional shipping charges due to their size, weight, or special handling. These charges are specified on the product pages and are not eligible for shipping discounts.

  • Exclusions: Gift cards, packaging, taxes, and prior purchases do not count toward the minimum purchase requirement for free shipping. This offer is valid only for shipments to U.S. addresses, including Puerto Rico.

Delivery Details:

  • Estimates: Standard shipping within the US typically takes 3-7 business days. These are estimates and not guarantees.

  • Shipping Restrictions: We ship to all 50 states, Washington, DC, U.S. territories, and APO/FPO/DPO addresses. Shipping options vary based on the delivery address.

  • Remote Areas: Shipments to remote areas may incur additional charges or require pickup from a nearby shipping partner’s location.

Shipping Confirmation:

You will receive a shipping confirmation email with a tracking number as soon as your order is dispatched. If you do not receive this email immediately, please be assured that your items will arrive within the estimated delivery window provided at checkout.

Order Modifications:

If you need to cancel or modify your order, please contact our customer support immediately.

Issues with Delivery:

If your order shows as delivered but you have not received it, please contact the shipping carrier directly to resolve the issue. For persistent problems, contact our customer service at cs@everymarket.com.

Customer Support:

Our team is available 24/7 to assist you with any questions or concerns regarding your order. We are committed to ensuring a smooth shopping experience.

Return & Refund Policy Overview

Please review our return and refund policies below to ensure a smooth transaction process.

Return Policy

  • Duration: You have 30 days from receiving your item to initiate a return.

  • Condition: Items must be unworn, unwashed, with original tags and packaging intact.

  • Shipping Costs:
    - If your return is approved due to a defective, damaged, or incorrect item, we will provide a prepaid return shipping label at no cost.

    - If the item has no quality issues and matches the product listing and description, please contact our Customer Service team before returning it. Once your return is authorized, you must return the item according to the provided instructions. In this case, the return shipping cost is the customer's responsibility.

    - We are not responsible for return shipping costs for items returned without prior authorization.

  • Packaging: Ensure returned items are well-packaged to avoid damage during transit.

  • Tracking: Use a trackable and insured shipping method as we are not liable for items lost or damaged on return.

  • Initiating a Return: Contact us at cs@everymarket.com to start your return. We will provide a return shipping label and instructions upon approval. Returns without prior approval will not be accepted.

How to Return

  • Method: Returns must be sent back by mail to the address provided in the return instructions.

Return Label

  • Please contact us to get return labels.

Product Conditions for Return

  • Eligible Products: Returns are only accepted for items in new condition.

Nonreturnable Items

Certain items are not eligible for return:

  • Electronic devices after 30 days (e.g., computers, laptops, Kindles)

  • Gift cards, prepaid game cards

  • Perishable goods, live insects, some jewelry, some health and personal care items

  • Customized or personalized products

  • Items with special shipping restrictions

Refund Policy

  • Window: Eligible products may be returned within 30 days of delivery for a refund.

  • Refund Method: Refunds are processed to the original payment method or as store credit for items purchased with gift cards.

  • Processing Time: Refunds are processed within 3-5 business days after we receive the return; please allow additional time for shipping and bank processing.

Claims

Inspect your order upon arrival and report any defects, damages, or incorrect items immediately to allow us to address the issue. For claims, contact our support team with details of the issue.

Exchange Policy

For the quickest service, return your original item and place a new order for the desired product once your return is accepted.

Return Address

EveryMarket Customer Service 2101 E Terra Ln, O'Fallon, MO 63366

Customer Support

Available 24/7 for any questions or assistance needed:

  • Phone: +1 (800) 660-3783

  • Email: cs@everymarket.com

 

DESCRIPTION:

Model 252AP Discrete Operational Amplifier
No other Discrete Op-Amp on the market comes even close to our fully tested specifications.
This auction is for Qty(1) Brand New! Fully tested and assembled discrete opamp, ready to drop in and go!

This unit is available with 2 pin lengths, Standard 0.30" long or Retro/Vintage 0.50" long, Let us know at time of purchase which pin length you want. See Application Note AN-18 for more details.

Height, Pin Length OPTION's and socketing dimensions for both standard product and retro-clone or vintage upgrades.


General Description:
Model 252AP Discrete Operational Amplifier

The Sonic Imagery Labs Model 252AP is a high performance discrete operational amplifier designed for professional audio applications and areas where ultralow noise and low distortion is required. The 252AP is best suited for use in circuits with medium to high source impedances and with microphone input transformers with high turns ratios (> 1:4). The Model 252AP is a modern re-engineering and redesign of the classic 2520 discrete op-amp. It was designed as an enhanced higher performance upgrade replacement with a focus on superior AC and DC performance. The pinouts conform to the 2520/990 package, allowing direct replacement.

The all-discrete SMT design is similar to the API2520 basic topology but has been redesigned to use an ultra-precision differential super-matched input transistor pair specifically designed to meet the requirements of ultra-low noise and ultra-low THD audio systems. A variant (252AP-ULN) is also available for ultra damn low noise applications. (0.560nV/rtHz at 1kHz) Unlike the original API2520 design, the 252AP can incorporate two precision matched pair transistors as the differential input stage. A total of 4 matched devices, for ultra-ultra low noise applications. These devices are selected by the manufacturer at final test to Sonic Imagery Labs noise, Vos, Ic and Vbe matching specifications.



DC perfomance is easily a magnitude better than previous counterparts. With an offset voltage of better than ±35uV (at Av1) and input leakage better than <30nA, the Sonic Imagery Labs Model 252AP is well suited for DC coupled audio applications in which output offset errors cannot be tolerated.

In addition to the enhanced input stage, and unlike the original API2520 devices, the Sonic Imagery Labs 252AP uses precision temperature stable power supply independent current sources. Supply independent current sources allow the bias of the input and matched pair differential VAS stage to remain locked at the optimum operating point regardless of power supply voltage.

Another feature not found in the original API2520 design is the addition of matched pair active current loads which gives the Model 252AP differential input and VAS stage it’s outstanding (PSRR) power supply noise rejection ratio performance.

The Sonic Imagery Labs 252AP can be operated from ±10V to ±25V power supplies. The redesigned input stage circuitry provides outstanding common-mode rejection and maintains low input bias current over its wide input voltage range, minimizing distortion. The 252AP is unity-gain stable and provides outstanding dynamic behavior over a wide range of load conditions.

Integrated power transistor heatsinks coupled to a anodized aluminum enclosure keeps the Sonic Imagery Labs 252AP operating within a wide safe operating area (SOA) and does not suffer from Beta droop when driving heavy loads. Each amplifier is individually fully tested and meets or exceeds published specifications.

Features:

• Ultra Low Total Harmonic Distortion, 0.0003 THD+N @ 1kHz
• Ultra Low Noise 0.92nV/rtHz typical@1Khz Rs=150 ohm
• High Current Output Drive (250mA peak)
• +28dBu Output Levels (into 600 ohms)
• Standard Gain Block Footprint
• Operates over ±10V to ±28V supply rails
• Much lower output offset voltage than existing counterparts
• Lower input leakage current than existing counterparts
• Particular emphasis on audio performance
• Designed, assembled and produced in the USA
• 3 Year Warranty

Applications:

• Low Impedance Line Amplifiers and Drivers
• Active Filters and Equalizers
• Summing/Mixer Amplifiers
• High Performance Microphone Preamplifiers
• High Performance A/D and D/A front end Preamplifier
• High Performance D/A I-V convertors
• High Current Buffer Amplifier


Specifications:

Height, Pin Length OPTION's and socketing dimensions for both standard product and retro-clone or vintage upgrades.

DOMESTIC SHIPPING AND HANDLING:
Shipping and handling charges: Items can be shipped First Class Parcel for $5.85 tracking or USPS Flat Rate Priority Mail for $10.20 with tracking.

INTERNATIONAL SHIPPING AND HANDLING:
USPS First Class International Parcel ---> for $19.70

USPS International Flat Rate Priority Mail ---> for $44.80

CANADA and MEXICO ships USPS International Flat Rate Priority Mail $31.45, customs tracking to the border. All other countries- Contact us directly if you would rather use your own FEDEX, DHL or UPS carrier account.

CONDITIONS OF SALE:
Please read our terms carefully. Failure to understand our terms and conditions will delay your shipment of your items.  All items are sold with a 14 day satisfaction, money back, guarantee. Payment is due within 10 business days of auction's end. 

PAYMENT INFO:
We accept Visa, Mastercard, American Express and Discover thru the eBay payment system. Payments from outside the US should be payable in US Dollars. 

See Also

Sonic Imagery Labs Model 992Enh-Ticha- Discrete Op Amp DIP8
Sonic Imagery Labs Model 994Enh-Ticha- Dual Discrete Op Amp DIP8
Sonic Imagery Labs Model 995FET-Ticha- FET Discrete Op Amp 990/2520
Sonic Imagery Labs Model 990Enh-Ticha- Discrete Op Amp 990/2520
Sonic Imagery Labs Model 312A VCA Module -Voltage Controlled Amplifier
 Sonic Imagery Labs Model 898B 16 Channel Level Translator -Balanced - Unbalanced Cable Driver

Contact us directly for OEM and quantity pricing.

Shipping Overview: 

• Shipping: Standard Domestic Shipping within the United States charges first item USD 6.99 and additional item USD 3.0 each. Standard International Shipping from United Kingdom, Germany, Italian and Japan to the United States charges first item USD 11.99 and additional item USD 4.0 each.

• Import Duty: Everymarket collects applicable duties and taxes on goods imported into the U.S. at checkout, it's calculated based on the goods value multiply by the rate. For United Kingdom and China goods is 10%, Germany, Italian and Japan goods is 15%. We are committed to making your U.S. shopping experience simple and transparent. The method of delivery—either Delivered Duty Paid (DDP) or Delivered Duty Unpaid (DDU)—depends on whether duties and taxes are collected at the time of your purchase.

• Order Processing: Please allow 1-2 business days for order processing and preparation before shipment. 

• Domestic Shipping: Orders within the U.S. are shipped via USPS or FedEx, depending on the origin of the product. Average transit times to the United States is 3 - 7 Business days and average transit times to International is 7 - 14 Business days 

• International Shipping: Currently, we only ship within the USA. 

• Tracking Information: Every order is trackable. You will receive a tracking number once your order has been shipped. Products may be shipped from various global fulfillment centers.

Shipping Delays: 

Please note that shipping times may vary due to factors beyond our control, such as weather conditions, natural disasters, or peak holiday periods. While we strive to ensure timely delivery, the exact arrival time cannot be guaranteed and is managed by the shipping carrier.

Shipping Options:

  • Standard Delivery: Most orders are shipped within 3-7 business days. Larger items may utilize LTL shipping for safe handling.

  • Handling Time: We handle shipments on business days (Monday - Friday), with a preparation time of 1-2 days.

  • Additional Charges: Some items require additional shipping charges due to their size, weight, or special handling. These charges are specified on the product pages and are not eligible for shipping discounts.

  • Exclusions: Gift cards, packaging, taxes, and prior purchases do not count toward the minimum purchase requirement for free shipping. This offer is valid only for shipments to U.S. addresses, including Puerto Rico.

Delivery Details:

  • Estimates: Standard shipping within the US typically takes 3-7 business days. These are estimates and not guarantees.

  • Shipping Restrictions: We ship to all 50 states, Washington, DC, U.S. territories, and APO/FPO/DPO addresses. Shipping options vary based on the delivery address.

  • Remote Areas: Shipments to remote areas may incur additional charges or require pickup from a nearby shipping partner’s location.

Shipping Confirmation:

You will receive a shipping confirmation email with a tracking number as soon as your order is dispatched. If you do not receive this email immediately, please be assured that your items will arrive within the estimated delivery window provided at checkout.

Order Modifications:

If you need to cancel or modify your order, please contact our customer support immediately.

Issues with Delivery:

If your order shows as delivered but you have not received it, please contact the shipping carrier directly to resolve the issue. For persistent problems, contact our customer service at cs@everymarket.com.

Customer Support:

Our team is available 24/7 to assist you with any questions or concerns regarding your order. We are committed to ensuring a smooth shopping experience.

Return & Refund Policy Overview

Please review our return and refund policies below to ensure a smooth transaction process.

Return Policy

  • Duration: You have 30 days from receiving your item to initiate a return.

  • Condition: Items must be unworn, unwashed, with original tags and packaging intact.

  • Shipping Costs:
    - If your return is approved due to a defective, damaged, or incorrect item, we will provide a prepaid return shipping label at no cost.

    - If the item has no quality issues and matches the product listing and description, please contact our Customer Service team before returning it. Once your return is authorized, you must return the item according to the provided instructions. In this case, the return shipping cost is the customer's responsibility.

    - We are not responsible for return shipping costs for items returned without prior authorization.

  • Packaging: Ensure returned items are well-packaged to avoid damage during transit.

  • Tracking: Use a trackable and insured shipping method as we are not liable for items lost or damaged on return.

  • Initiating a Return: Contact us at cs@everymarket.com to start your return. We will provide a return shipping label and instructions upon approval. Returns without prior approval will not be accepted.

How to Return

  • Method: Returns must be sent back by mail to the address provided in the return instructions.

Return Label

  • Please contact us to get return labels.

Product Conditions for Return

  • Eligible Products: Returns are only accepted for items in new condition.

Nonreturnable Items

Certain items are not eligible for return:

  • Electronic devices after 30 days (e.g., computers, laptops, Kindles)

  • Gift cards, prepaid game cards

  • Perishable goods, live insects, some jewelry, some health and personal care items

  • Customized or personalized products

  • Items with special shipping restrictions

Refund Policy

  • Window: Eligible products may be returned within 30 days of delivery for a refund.

  • Refund Method: Refunds are processed to the original payment method or as store credit for items purchased with gift cards.

  • Processing Time: Refunds are processed within 3-5 business days after we receive the return; please allow additional time for shipping and bank processing.

Claims

Inspect your order upon arrival and report any defects, damages, or incorrect items immediately to allow us to address the issue. For claims, contact our support team with details of the issue.

Exchange Policy

For the quickest service, return your original item and place a new order for the desired product once your return is accepted.

Return Address

EveryMarket Customer Service 2101 E Terra Ln, O'Fallon, MO 63366

Customer Support

Available 24/7 for any questions or assistance needed:

  • Phone: +1 (800) 660-3783

  • Email: cs@everymarket.com

 

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