BC33725BU

Single Bipolar Transistors Overview

The BC33725BU is an NPN silicon epitaxial planar transistor manufactured by Fairchild Semiconductor. It features a maximum collector-emitter voltage of 45 V and a continuous DC collector current rating of 0.8 A. The device operates within a temperature range of -55°C to +150°C. Key electrical parameters include a transition frequency of 100 MHz and a minimum DC current gain (hFE) of 160 at 100 mA. It is housed in a TO-92-3 through-hole package with a maximum power dissipation of 625 mW.

Single Bipolar Transistors Feature Summary

• NPN silicon epitaxial construction for general-purpose amplification
• High DC current gain suitable for driver applications
• Low collector-emitter saturation voltage for efficient switching

Single Bipolar Transistors Applications

• General-purpose amplifier circuits
• Switching applications requiring moderate current handling
• Driver transistors in logic interfaces

Single Bipolar Transistors Procurement Notes

Verify the manufacturer marking on the component body to confirm Fairchild Semiconductor origin, as this part number is widely produced by multiple vendors including onsemi. Ensure the suffix 'BU' corresponds to the specific binning or packaging configuration required for your design. Cross-reference datasheets from different manufacturers to confirm pinout compatibility and exact hFE grading specifications before finalizing procurement.

Single Bipolar Transistors Selection Notes

Select this component when a standard NPN transistor with 0.8 A current capability and 45 V breakdown voltage is required. The BC33725BU variant specifically targets applications needing a guaranteed minimum hFE of 160, distinguishing it from lower-gain variants like the BC337-16. Consider the TO-92 package constraints for thermal management if operating near the maximum power dissipation limit.

Single Bipolar Transistors Part Context

The BC337 series represents a family of general-purpose NPN bipolar junction transistors widely used in consumer electronics and industrial control. The BC33725BU belongs to the higher gain subgroup of this family, offering improved performance over standard variants. It serves as a direct replacement for older Motorola and Siemens designs, maintaining compatibility with legacy circuit schematics while providing modern manufacturing standards.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include BC337-25 and BC33725TAR. Verify that alternative manufacturers meet the same 0.8 A Ic and 45 V Vceo ratings. Check for identical TO-92 pinout configurations to ensure mechanical interchangeability without PCB redesign.