BD645-S

Description：TRANS NPN DARL 60V 8A TO-220
Series：-

SKU:8adeea157829 Category: Single Bipolar Transistors Brand: Bourns Inc.

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Product introduction

Product Detailed Parameters

Description：TRANS NPN DARL 60V 8A TO-220
Series：-
Mfr：Bourns Inc.
Package：Tube
Transistor Type：NPN - Darlington
Current - Collector (Ic) (Max)：8:00 AM
Voltage - Collector Emitter Breakdown (Max)：60 V
Vce Saturation (Max) @ Ib, Ic：2.5V @ 50mA, 5A
Current - Collector Cutoff (Max)：500µA
DC Current Gain (hFE) (Min) @ Ic, Vce：750 @ 3A, 3V
Power - Max：2 W
Frequency - Transition：-
Operating Temperature：-65°C ~ 150°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-220-3
Supplier Device Package：TO-220
Grade：-
Qualification：-

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BD645-S

Overview

The BD645-S is an NPN Darlington transistor manufactured by Bourns Inc. It features a maximum collector current of 8 A and a collector-emitter breakdown voltage of 60 V. The device supports a power dissipation of 62.5 W at a case temperature of 25°C. It exhibits a minimum DC current gain (hFE) of 750 when tested at 3 V and 3 A. These specifications define its electrical limits and operational capabilities.

Feature Summary

Darlington configuration providing high current amplification
Capable of handling continuous collector currents up to 8 A
Supports significant power dissipation for robust thermal operation

Applications

High-power switching circuits
Motor control systems
Industrial automation interfaces

Procurement Notes

Verify the part status before procurement as this component may be classified as obsolete in official catalogs. Confirm that the required electrical parameters, specifically the 60 V breakdown and 8 A current ratings, align with the design requirements. Ensure the package type matches the intended PCB layout and thermal management strategy.

Selection Notes

Select this component for applications requiring high current gain and substantial power handling capabilities. The Darlington structure offers superior amplification compared to single transistors. Consider thermal derating requirements for free air temperatures exceeding 25°C to maintain safe operating conditions within the specified limits.

Part Context

This component belongs to the BD645 series of NPN Darlington transistors from Bourns Inc. It is designed for general-purpose high-power applications. The series includes related models such as BD646, BD647, BD649, and BD651, which share similar structural characteristics but may differ in specific electrical ratings or configurations.

Replacement Considerations

Direct substitutes include BD646, BD647, BD649, and BD651. Verify compatibility regarding pinout and specific electrical limits before substitution. Cross-reference datasheets to ensure the alternative part meets the original circuit's voltage and current requirements.

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.