BC557B

Single Bipolar Transistors Overview

The Diotec Semiconductor BC557B is a general-purpose PNP silicon planar epitaxial transistor designed for commercial and industrial applications. It operates with a maximum collector current of 100 mA and a collector-emitter breakdown voltage of 45 V. The device features three distinct DC current gain groups, with the 'B' group providing a minimum hFE of 200 at an emitter current of -2 mA. Key electrical characteristics include a transition frequency of 150 MHz, a power dissipation rating of 500 mW, and a junction temperature range from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• General-purpose PNP bipolar junction transistor suitable for signal processing, switching, and amplification tasks.
• Offers three selectable current gain groups (A, B, C) to accommodate varying circuit requirements.
• Compliant with RoHS directives without exemptions and adheres to REACH regulations.

Single Bipolar Transistors Applications

• Signal processing circuits
• Electronic switching applications
• Amplification stages

Single Bipolar Transistors Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, such as standard ammo packs or bulk configurations. Confirm compliance with AEC-Q101 standards if automotive-grade reliability is necessary, as this requires specific suffix designations. Ensure the selected variant aligns with the intended commercial or industrial operating environment.

Single Bipolar Transistors Selection Notes

Select the BC557B when a moderate current gain is required alongside a 45 V collector-emitter voltage rating. This component serves as a direct complement to the BC547 NPN transistor within the same series. Consider the specific hFE group needed for the application, as the 'B' designation ensures a minimum gain of 200 under specified test conditions.

Single Bipolar Transistors Part Context

The BC557B belongs to the BC556 through BC559 family of universal PNP transistors manufactured by Diotec Semiconductor. These devices share a common TO-92 plastic package and are engineered for standard commercial and industrial grade reliability. The series provides a versatile solution for discrete semiconductor applications requiring small-signal handling capabilities.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes within the same manufacturer's lineup include the BC557A and BC557C, which offer different current gain ranges. Other manufacturers producing equivalent specifications may also serve as alternatives, provided the pinout and absolute maximum ratings match the original design requirements.

Single Bipolar Transistors FAQ

What is the minimum DC current gain for the BC557B?

The minimum DC current gain (hFE) for the BC557B is 200, measured at an emitter current of -2 mA and a collector-emitter voltage of -5 V.

Is the BC557B available in an automotive-grade version?

Yes, Diotec offers versions compliant with AEC-Q101 standards. These variants typically carry specific suffixes such as '-Q' for compliant parts or '-AQ' for qualified parts.

What is the recommended complementary NPN transistor?

The recommended complementary NPN transistor for the BC557B is the BC547, which shares similar electrical characteristics and package dimensions.