BC548B

Single Bipolar Transistors Overview

The onsemi BC548B is an NPN silicon epitaxial planar transistor designed for general-purpose amplifier and switching applications. It operates with a maximum collector-emitter voltage of 30 Vdc and continuous collector current of 100 mAdc. The device dissipates up to 625 mW at 25°C ambient temperature, featuring a transition frequency (fT) of 300 MHz. DC current gain (hFE) ranges from 200 to 450 at Ic = 2.0 mA and Vce = 5.0 V. It utilizes a TO-92 (Case 29) through-hole package.

Single Bipolar Transistors Feature Summary

• NPN epitaxial silicon planar design suitable for low-noise audio and signal processing
• High DC current gain classification (B grade) for consistent amplification performance
• Complementary PNP devices available in the BC558 series for push-pull configurations

Single Bipolar Transistors Applications

• General-purpose small-signal amplification
• Low-noise audio pre-amplifier stages
• Electronic switching circuits

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm packaging type and lead-free status. Confirm that the component matches the Case 29 mechanical dimensions and pinout configuration required by the target circuit board layout prior to integration.

Single Bipolar Transistors Selection Notes

Select this component when a minimum hFE of 200 is required at low currents. Ensure the application voltage does not exceed the 30 V collector-emitter breakdown rating. Consider thermal derating if operating above 25°C ambient temperature to maintain safe junction temperatures within the specified range.

Single Bipolar Transistors Part Context

This part belongs to the BC546/BC547/BC548 family of NPN transistors. The 'B' suffix denotes a specific binning category for DC current gain, distinguishing it from the 'A' and 'C' variants which offer different gain ranges. It serves as the NPN counterpart to the BC558 PNP transistor.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include BC548B-E7 (Vishay) and BC548B A1 G (Taiwan Semiconductor). Verify electrical parameters and package compatibility before substitution.