BD679A

Description：TRANS NPN DARL 80V 4A TO-126
Series：-

SKU:d0ec66347004 Category: Single Bipolar Transistors Brand: onsemi

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Product introduction

Product Detailed Parameters

Description：TRANS NPN DARL 80V 4A TO-126
Series：-
Mfr：onsemi
Package：Bulk
Transistor Type：NPN - Darlington
Current - Collector (Ic) (Max)：4:00 AM
Voltage - Collector Emitter Breakdown (Max)：80 V
Vce Saturation (Max) @ Ib, Ic：2.8V @ 40mA, 2A
Current - Collector Cutoff (Max)：500µA
DC Current Gain (hFE) (Min) @ Ic, Vce：750 @ 2A, 3V
Power - Max：40 W
Frequency - Transition：-
Operating Temperature：150°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-225AA, TO-126-3
Supplier Device Package：TO-126
Grade：-
Qualification：-

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BD679A

Overview

The BD679A is an NPN power Darlington transistor manufactured using planar base island technology. It features a monolithic Darlington configuration with an integrated antiparallel collector-emitter diode. The device offers good hFE linearity and high fT frequency performance. Key electrical parameters include a maximum continuous collector current of 4 A, a maximum collector-emitter voltage of 80 V, and a minimum DC current gain (hFE) of 750. It operates within a temperature range of -65°C to 150°C.

Feature Summary

Monolithic Darlington configuration with integrated antiparallel collector-emitter diode
Good hFE linearity for stable amplification
High fT frequency capability

Applications

Power switching applications requiring high current gain
Amplifier circuits utilizing the linear hFE characteristics
Industrial control systems operating in wide temperature ranges

Procurement Notes

Verify the manufacturer origin, as BD679A parts are produced by multiple vendors including NEC and Magnatec. Confirm that the specific unit received matches the required pinout and package dimensions for SOT-32. Ensure compliance with project specifications regarding the monolithic construction and integrated diode functionality before integration.

Selection Notes

Select this component when high current drive capability is needed with minimal input current. The integrated antiparallel diode simplifies circuit design for inductive loads. Consider the 80V voltage rating and 4A current limit against load requirements. The wide operating temperature range supports harsh environment deployment.

Part Context

This part belongs to the broader category of complementary silicon power Darlington transistors. It is often paired with PNP variants like the BD677A in push-pull or bridge configurations. The series provides solutions for applications needing high gain and robust switching performance in industrial and consumer electronics.

Replacement Considerations

Check for direct equivalents from other manufacturers such as Magnatec BD679. Verify pin compatibility and thermal characteristics when substituting. Ensure the replacement maintains the monolithic Darlington structure and integrated diode requirement.

How to buy

Online and offline orders are supported. If the item is available for online purchase, you can place it in the cart; for wholesale pricing, please contact our product manager for a quote.

Payment Method

Payment methods: T/T, WeChat Pay, credit cards, Google Pay, Apple Pay . Buyer covers shipping, fees, duties, and taxes; contact our product manager if you need a contract/procurement process.

Delivery time

In-stock items usually ship within 24 hours. Otherwise, shipment is arranged 1 to 2 days after the items arrive at our warehouse. Timing depends on destination and shipping method.

Freight calculation

Freight cost depends on destination, package size, and weight . We offer shipping options via DHL, FedEx, UPS, and TNT , and can ship using your freight account upon request.

Mode of Transportation

We ship via DHL, FedEx, UPS, and TNT. If you prefer a specific logistics provider, we can ship using your designated carrier.

Return and Refund

Returns are accepted within 60 days of invoice with RMA approval. Items must be resalable; original invoice and test report are required. No returns for customer errors.