BC558B

Single Bipolar Transistors Overview

The Diotec Semiconductor BC558B is a PNP silicon epitaxial planar transistor designed for general-purpose switching and amplification applications. It operates with a maximum collector current of 100 mA and a collector-emitter voltage (VCEO) of -30 V. The device features three distinct DC current gain groups, with the 'B' group providing a minimum hFE of 200 at IC = -2 mA. It is housed in a TO-92 plastic package and supports a junction temperature range from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• General-purpose design suitable for signal processing, switching, and amplification tasks
• Three selectable current gain groups (A, B, C) to accommodate varying circuit requirements
• Compliant with RoHS directives without exemption and REACH regulations

Single Bipolar Transistors Applications

• Signal processing circuits
• General purpose switching applications
• Amplification stages

Single Bipolar Transistors Procurement Notes

Verify that the specific ordering suffix matches the required AEC-Q101 qualification status if automotive grade compliance is necessary. Confirm the package marking code corresponds to the intended gain group. Ensure the procurement documentation references the correct datasheet version to validate absolute maximum ratings and thermal characteristics.

Single Bipolar Transistors Selection Notes

Select the BC558B variant when a collector-emitter voltage rating of -30 V is sufficient for the application. Choose this component over higher voltage counterparts like the BC556 or BC557 specifically for cost-sensitive designs where lower breakdown voltages are acceptable. Verify that the Group B gain range aligns with the biasing requirements of the target amplifier or switch topology.

Single Bipolar Transistors Part Context

This component belongs to the BC556 through BC559 series of universal PNP transistors manufactured by Diotec Semiconductor. These devices share a common TO-92 mechanical footprint but differ in their voltage ratings and current gain specifications. The BC558B represents the medium-voltage option within this family, offering a balance between breakdown capability and gain performance for standard commercial and industrial electronics.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include the BC558B from other manufacturers such as NXP Semiconductors or ON Semiconductor, provided they adhere to the same TO-92 pinout and electrical limits. Cross-referencing with the BC557B may be possible if the application can tolerate the higher -45 V collector-emitter voltage rating.