BC557ATA

Single Bipolar Transistors Overview

The BC557ATA is a PNP silicon epitaxial planar transistor manufactured by onsemi, housed in a TO-92-3 through-hole package with kinked leads. It features a maximum collector-emitter voltage (VCEO) of 45 V and a continuous collector current of 100 mA. The device has a power dissipation rating of 500 mW and a transition frequency (fT) of 150 MHz. Key electrical limits include a collector-base voltage of 50 V, an emitter-base voltage of 5 V, and a saturation voltage of 250 mV. It operates at temperatures up to +150°C.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration for signal amplification and switching applications
• Through-hole mounting capability via TO-92-3 package with kinked leads
• Silicon epitaxial planar construction for reliable performance

Single Bipolar Transistors Applications

• General-purpose amplifier circuits
• Electronic switching applications
• Small-signal processing tasks

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer designation, as the BC557ATA part number appears associated with multiple vendors including onsemi, Fairchild, and WinStar in public records. Confirm RoHS compliance status and datasheet version directly with the supplier, as specifications may vary between manufacturers offering this component code. Ensure the package type matches the required kinked lead configuration for your assembly process.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with 45 V breakdown and 100 mA current handling is required in a standard through-hole form factor. Consider the 500 mW thermal limit and ensure adequate heat dissipation for high-duty cycles. Verify that the hFE gain band meets circuit requirements, as values differ across manufacturers using this base model number.

Single Bipolar Transistors Part Context

This component belongs to the BC557 series of general-purpose PNP transistors. The 'A' suffix typically denotes a specific DC current gain (hFE) binning range defined by the manufacturer. The BC557 series is widely used in consumer electronics and industrial control systems requiring small-signal amplification or low-power switching functions.

Single Bipolar Transistors Replacement Considerations

BC557BTA and BC557BTF are parameter-equivalent replacements from onsemi. Other manufacturers offer compatible parts such as Diotec's BC557A or Vishay's BC557ABU, though gain ranges and packaging may differ.