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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 onsemi BD439 is a plastic medium power silicon NPN transistor designed for linear and switching applications. It serves as the complementary device to the BD440 and BD442 PNP transistors within the same family. The component is manufactured using epitaxial silicon technology, providing robust performance for general-purpose amplification and control circuits.
Feature Summary
- Complementary pairing with BD440 and BD442 PNP transistors for balanced circuit design
- Epitaxial silicon construction for reliable medium power operation
- Plastic encapsulation suitable for through-hole mounting
Applications
- Medium power linear amplifier circuits
- General purpose switching applications
- Complementary output stages in audio or signal processing
Procurement Notes
Verify the specific manufacturer source, as Fairchild Semiconductor originally produced this part before its acquisition by onsemi. Confirm that the datasheet revision matches the required manufacturing era, as specifications may vary slightly between legacy Fairchild and current onsemi production runs. Ensure compliance with RoHS directives if applicable to the target assembly.
Selection Notes
Select the BD439 when a medium power NPN transistor is required to complement a BD440 or BD442 PNP device. This pairing ensures matched characteristics for push-pull configurations. Consider the plastic package constraints and thermal dissipation requirements relative to the specific linear or switching load expected in the design.
Part Context
The BD439 belongs to a family of medium power silicon transistors widely used in analog and digital circuits. Historically associated with Fairchild Semiconductor, it is now part of onsemi's portfolio. These devices are standard components for general-purpose amplification, offering a balance of gain, voltage handling, and current capacity for non-high-frequency applications.
Replacement Considerations
Public confirmed substitute part numbers: BD439G (onsemi), BD439M (STMicroelectronics). Verify pinout compatibility and electrical limits against the original design requirements before substitution.
