BC849CW

Overview

The BC849CW is an NPN general-purpose bipolar junction transistor manufactured by Taiwan Semiconductor Corporation. It utilizes a silicon epitaxial planar design housed in the SOT-323 surface-mount package. The device supports a maximum collector-emitter voltage of 30 V and a collector-base voltage of 30 V, with a maximum emitter-base voltage of 5 V. It handles a continuous collector current of 100 mA and dissipates up to 200 mW of power. Key electrical characteristics include a transition frequency of 100 MHz and a collector-emitter saturation voltage of 600 mV. The component operates within a temperature range of -55°C to +150°C.

Feature Summary

• NPN epitaxial silicon planar construction for reliable switching and amplification
• Compact SOT-323 surface-mount packaging suitable for space-constrained designs
• High DC current gain capability for efficient signal processing
• Wide operating temperature range ensuring stability in varied environments

Applications

• General purpose amplifier circuits
• Electronic switching applications
• Signal conditioning stages

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the BC849CW part number is utilized by multiple semiconductor producers including Diotec and Nexperia. Confirm that the received component matches the Taiwan Semiconductor datasheet specifications regarding pinout and electrical limits. Ensure compliance with required environmental standards such as RoHS directives before integration into final assemblies.

Selection Notes

Select this component for low-power applications requiring moderate voltage handling and small form factors. The 30 V rating and 100 mA current capacity define its operational boundaries compared to higher-voltage variants like the BC847 or BC848. Consider the thermal dissipation limits of the SOT-323 package when designing heat management strategies for dense PCB layouts.

Part Context

This transistor belongs to the broader BC846/BC847/BC848/BC849/BC850 series of NPN general-purpose transistors. Within this family, the 'C' suffix typically denotes the 30 V voltage class, distinguishing it from the 'A' (65 V) and 'B' (45 V) variants. The SOT-323 package provides a smaller footprint than the traditional SOT-23 while maintaining similar electrical performance profiles for standard signal applications.

Replacement Considerations

Cross-reference with other manufacturers offering the BC849CW specification, such as Diotec Semiconductor or Nexperia. Verify that alternative sources provide identical SOT-323 pinouts and match the 30 V / 100 mA electrical ratings to ensure functional compatibility without circuit redesign.