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Product Detailed Parameters
- Description：TRANS NPN 60V 4A TO-126
- Series：-
- Mfr：onsemi
- Package：Bulk
- Transistor Type：NPN
- Current - Collector (Ic) (Max)：4:00 AM
- Voltage - Collector Emitter Breakdown (Max)：60 V
- Vce Saturation (Max) @ Ib, Ic：800mV @ 300mA, 3A
- Current - Collector Cutoff (Max)：100µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce：40 @ 500mA, 1V
- Power - Max：36 W
- Frequency - Transition：3MHz
- Operating Temperature：-55°C ~ 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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Overview
The BD439G is a silicon NPN power transistor manufactured by onsemi, designed for medium-power linear and switching applications. It features a maximum collector current of 4 A and a collector-emitter voltage rating of 45 V. The device operates within a temperature range of -55°C to +150°C and offers a gain-bandwidth product of 3 MHz. With a power dissipation capacity of 36 W and a minimum DC current gain (hFE) of 30, it is housed in a TO-225-3 package suitable for through-hole mounting.
Feature Summary
- Designed for medium-power linear and switching applications
- High thermal stability with extended operating temperature range
- Robust current handling capability for power circuits
Applications
- Audio amplifier output stages
- General-purpose power switching circuits
- Complementary pairs with PNP transistors like the BD440G
Procurement Notes
Verify the specific datasheet revision and RoHS compliance status directly from onsemi documentation before integration. Confirm that the TO-225-3 package dimensions match your PCB footprint requirements. Ensure thermal management solutions are adequate for the 36 W power dissipation rating under expected load conditions.
Selection Notes
Select this component when a robust NPN transistor with 4 A continuous current capability is required. It serves as the complementary counterpart to the BD440G PNP transistor in push-pull configurations. Consider its 45 V voltage rating and 3 MHz bandwidth for audio and general-purpose power control tasks.
Part Context
The BD439G belongs to the BD43x series of plastic medium-power silicon NPN transistors. This family is widely used in consumer electronics and industrial equipment where reliable power amplification or switching is needed. It complements the BD44x series of PNP transistors to form matched pairs for balanced circuit designs.
Replacement Considerations
The BD439 is the base part number; verify if the 'G' suffix denotes specific lead-free or packaging variations. Check for direct equivalents from other manufacturers such as Fairchild or STMicroelectronics, ensuring pinout compatibility and matching electrical ratings.
