BC557A

Single Bipolar Transistors Overview

The BC557A is a PNP silicon planar epitaxial transistor manufactured by Diotec Semiconductor. It operates with a maximum collector current of 100 mA and a collector-emitter voltage (VCEO) of 45 V. The device features three distinct DC current gain groups, with the 'A' group providing a minimum hFE of 110 at IC = -2 mA. Maximum power dissipation is rated at 500 mW, and the junction temperature range spans from -55°C to +150°C. The component utilizes a TO-92 plastic package.

Single Bipolar Transistors Feature Summary

• General-purpose design suitable for signal processing, switching, and amplification applications
• Available in three standardized current gain groups for precise selection
• Compliant with RoHS directives without exemption and REACH regulations

Single Bipolar Transistors Applications

• Signal processing circuits
• Electronic switching functions
• Amplification stages

Single Bipolar Transistors Procurement Notes

Verify that the specific part number matches the required current gain group, as the BC557A designation corresponds to a specific hFE range within the broader BC557 family. Confirm compliance requirements such as AEC-Q101 if automotive standards are necessary, noting that standard versions do not inherently include this qualification. Ensure the ordering suffix aligns with the desired packaging format, such as ammo pack or bulk.

Single Bipolar Transistors Selection Notes

Select the BC557A when a PNP transistor with a 45 V collector-emitter breakdown voltage and 100 mA continuous current capability is required. The 'A' suffix indicates a specific gain bin, ensuring predictable performance for linear amplification tasks. Consider the complementary BC556A/B/C series for matched NPN/PNP pairs in differential or push-pull configurations.

Single Bipolar Transistors Part Context

This component belongs to the BC556 through BC559 series of general-purpose PNP transistors. These devices share similar physical characteristics but differ in voltage ratings and gain specifications. The BC557 variant specifically offers a 45 V rating, distinguishing it from the higher-voltage BC556 and lower-voltage BC558/BC559 models within the same product line.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include BC557B and BC557C from Diotec, which offer different gain ranges. Other manufacturers produce equivalent parts under the same base model numbers, provided the voltage, current, and gain specifications meet the circuit requirements.