BC557A

Single Bipolar Transistors Overview

The BC557A is a PNP silicon planar epitaxial transistor manufactured by onsemi, housed in a TO-92-3 through-hole package. It features a maximum collector-emitter voltage (VCEO) of -45 V and a collector-base voltage (VCBO) of -50 V. The device supports a continuous collector current of -100 mA with a power dissipation rating of 500 mW at 25°C ambient temperature. Key electrical characteristics include a transition frequency (fT) of 150 MHz and an emitter-base voltage (VEBO) limit of 5 V. The component operates within a junction temperature range up to +150°C.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration for general-purpose signal amplification
• Silicon planar epitaxial construction for stable performance
• Through-hole mounting capability via standard leaded package

Single Bipolar Transistors Applications

• General-purpose small-signal amplification circuits
• Switching applications requiring low current control
• Audio pre-amplifier stages

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer lot and RoHS compliance status directly with onsemi or authorized distributors, as historical production data indicates potential end-of-life transitions for certain variants. Confirm that the received components match the exact BC557A designation and packaging type required for your assembly process.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with a 45V breakdown voltage and 100mA current capacity is required in a TO-92 form factor. Ensure the application design accounts for the 500mW thermal dissipation limit and verify that the hFE gain band meets the circuit's amplification requirements without excessive variation.

Single Bipolar Transistors Part Context

This part belongs to the BC556/BC557/BC558 series of PNP transistors, differentiated primarily by their DC current gain (hFE) bins. The 'A' suffix typically denotes a specific gain range within the family. It serves as a complementary counterpart to NPN devices like the BC547A in standard analog circuit topologies.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include BC557BTA and BC557ABU from onsemi, which share identical electrical ratings and pinouts. Other manufacturers such as Diotec Semiconductor offer equivalent parts under the same model number.