BD437S

Description：TRANS NPN 45V 4A TO-126-3
Series：-

SKU:4d677bc012e8 Category: Single Bipolar Transistors Brand: onsemi

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Product introduction

Product Detailed Parameters

Description：TRANS NPN 45V 4A TO-126-3
Series：-
Mfr：onsemi
Package：Bulk
Transistor Type：NPN
Current - Collector (Ic) (Max)：4:00 AM
Voltage - Collector Emitter Breakdown (Max)：45 V
Vce Saturation (Max) @ Ib, Ic：600mV @ 200mA, 2A
Current - Collector Cutoff (Max)：100µA
DC Current Gain (hFE) (Min) @ Ic, Vce：30 @ 10mA, 5V
Power - Max：36 W
Frequency - Transition：3MHz
Operating Temperature：150°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-225AA, TO-126-3
Supplier Device Package：TO-126-3
Grade：-
Qualification：-

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BD437S

Overview

The BD437S is an NPN epitaxial silicon power transistor manufactured by onsemi, housed in a TO-126 package. It supports a maximum collector current of 4 A and a collector-emitter voltage of 45 V. The device handles up to 36 W of power dissipation at 25°C case temperature. Key electrical characteristics include a DC current gain ranging from 30 to 130 depending on operating conditions, a saturation voltage of 0.6 V maximum, and a transition frequency of 3 MHz.

Feature Summary

Designed for medium power linear and switching applications
Complementary PNP type available as BD438

Applications

Medium power linear circuits
Switching applications

Procurement Notes

Verify the specific ordering suffix 'S' corresponds to the TO-126 bulk packaging configuration. Confirm that the component is sourced from authorized distributors to ensure authenticity, as counterfeit parts may exhibit substandard performance or failed applications. Cross-reference the datasheet revision with the manufacturer's official website for any updates regarding product status or pinout definitions.

Selection Notes

Select this component when a robust NPN power transistor with a 45 V rating and 4 A continuous current capability is required. Ensure the application design accommodates the specified 36 W thermal dissipation limits at the intended case temperature. Consider the complementary BD438 if a matched PNP pair is needed for push-pull configurations.

Part Context

This part belongs to the BD433/435/437 series of NPN epitaxial silicon transistors. The BD437 variant specifically offers a 45 V breakdown voltage, distinguishing it from the lower-voltage BD433 (22 V) and BD435 (32 V). The series is intended for general-purpose medium power applications within the semiconductor portfolio.