BC547BBU

Single Bipolar Transistors Overview

The BC547BBU is an NPN epitaxial silicon transistor from the BC546/547/548/549/550 series, manufactured by ON Semiconductor. It features a collector-emitter voltage (VCEO) of 45 V and a maximum DC collector current (IC) of 100 mA. The device operates with a junction temperature up to +150 °C and power dissipation of 500 mW. The B-grade classification specifies a minimum DC current gain (hFE) of 110 at IC = 2 mA. Key electrical parameters include a collector-base voltage (VCBO) of 50 V, emitter-base voltage (VEBO) of 6 V, and a transition frequency (fT) of 300 MHz.

Single Bipolar Transistors Feature Summary

• NPN epitaxial silicon construction for switching and amplifier applications
• High-voltage capability with 45 V collector-emitter rating
• B-grade binning ensures a minimum DC current gain of 110
• Low noise figure suitable for general signal processing

Single Bipolar Transistors Applications

• General-purpose switching circuits
• Small-signal amplification stages
• Audio pre-amplifier inputs
• Logic interface buffers

Single Bipolar Transistors Procurement Notes

Verify the part number suffix BU indicates bulk packaging in TO-92. Confirm the manufacturer is ON Semiconductor, noting the integration history from Fairchild Semiconductor. Ensure the datasheet revision matches the specific ordering information provided. Check for RoHS compliance status if required by your assembly process. Validate that the B-grade hFE range meets your circuit design requirements before finalizing procurement.

Single Bipolar Transistors Selection Notes

Select this component when a standard NPN small-signal transistor with moderate voltage ratings is required. The B-grade gain binning provides better consistency than the A-grade for linear applications. Consider the BC547BBU over higher voltage variants like the BC546 if cost or specific gain characteristics are prioritized. Ensure the TO-92 package fits the thermal and spatial constraints of the PCB layout.

Single Bipolar Transistors Part Context

This component belongs to the widely used BC54x family of NPN transistors. It serves as the complement to the PNP BC557. The BC547 variant specifically offers a 45 V rating, distinguishing it from the lower voltage BC548/BC549 and the higher voltage BC546. The 'BU' suffix denotes bulk packing in a standard TO-92 leaded package.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include BC547B, BC547BT, and BC547CT depending on gain binning needs. Cross-reference with equivalent parts from other manufacturers such as MMBT3904 if pinout compatibility allows. Verify that replacement parts meet the same 45 V VCEO and 100 mA IC specifications.