BC550

Single Bipolar Transistors Overview

The BC550 is an NPN epitaxial silicon transistor manufactured by Fairchild Semiconductor, housed in a TO-92 package. It features a collector-emitter voltage of 45 V and a maximum collector current of 100 mA. The device exhibits low noise characteristics with a minimum DC current gain (hFE) ranging from 110 to 800. Key electrical parameters include a collector-base voltage of 50 V, emitter-base voltage of 5 V, and power dissipation of 500 mW. The transition frequency is typically 300 MHz, with a junction temperature rating up to 150 °C.

Single Bipolar Transistors Feature Summary

• Low-noise design suitable for sensitive signal amplification
• High-voltage capability with 45 V collector-emitter breakdown
• Wide DC current gain range for flexible biasing options
• Complementary pairing with PNP BC560 series transistors

Single Bipolar Transistors Applications

• General-purpose switching circuits
• Audio pre-amplifier stages
• Signal conditioning modules
• Linear amplifier applications

Single Bipolar Transistors Procurement Notes

Verify the specific hFE binning suffix required for your circuit's gain requirements, as the base part number covers a wide gain range. Confirm lead-free compliance status, as older stock may differ from current RoHS-compliant manufacturing runs. Ensure the TO-92 through-hole package aligns with your PCB footprint specifications before finalizing procurement orders.

Single Bipolar Transistors Selection Notes

Select this component when low noise performance is critical alongside moderate voltage handling. The broad hFE variation necessitates checking datasheet bins for precise gain control. Consider the complementary BC560 for push-pull configurations. Verify thermal management needs given the 500 mW dissipation limit in enclosed environments.

Single Bipolar Transistors Part Context

Part of the BC546–BC550 NPN and BC556–BC560 PNP family designed for general-purpose switching and amplification. The BC550 specifically targets low-noise applications within this lineup, distinguishing it from higher-voltage variants like the BC546. Manufactured using epitaxial silicon processes for reliable performance in consumer and industrial electronics.

Single Bipolar Transistors Replacement Considerations

BC550BTA and BC550CBU are verified alternative part numbers offering similar electrical characteristics. BC550CBU provides high-gain variants. Ensure pinout compatibility and package type match when substituting across different manufacturers or gain bins.