BC490G

Single Bipolar Transistors Overview

The BC490G is a PNP silicon epitaxial planar transistor manufactured by onsemi, designed for high current applications. It features a collector-emitter voltage rating of 45 V and a continuous collector current capacity of 1 A. The device utilizes a surface-mount SOT-89 package to facilitate compact circuit board layouts. Key electrical characteristics include a DC current gain (hFE) range typically spanning from 100 to 600 at a collector current of 10 mA. The component operates within a junction temperature range of -55°C to +150°C, ensuring reliability in diverse thermal environments.

Single Bipolar Transistors Feature Summary

• High current capability with 1 A continuous collector current rating
• Surface-mount SOT-89 package for space-efficient design
• Wide operating junction temperature range up to 150°C

Single Bipolar Transistors Applications

• General-purpose switching circuits
• Driver stages for power transistors or relays
• Linear regulator output stages

Single Bipolar Transistors Procurement Notes

Verify the specific datasheet revision when sourcing, as historical documents from Motorola and onsemi may exist. Confirm the package type matches the required footprint, as SOT-89 dimensions are standard but lead configurations should be checked against the latest manufacturer drawing. Ensure compliance with RoHS directives if required by the final assembly specifications.

Single Bipolar Transistors Selection Notes

Select this component for designs requiring moderate current handling in a small form factor. Consider the hFE variation across the specified range when designing bias networks to ensure consistent performance. Evaluate the thermal resistance of the SOT-89 package relative to the expected power dissipation to determine if additional heatsinking or copper area is necessary for stable operation.

Single Bipolar Transistors Part Context

The BC490G belongs to the BC4xx series of high-current PNP transistors originally developed by Motorola and now produced by onsemi. This series is widely recognized for its robustness in analog and digital switching applications. The G suffix typically indicates a Green/RoHS-compliant packaging variant, aligning with modern environmental standards while maintaining the electrical performance of the legacy BC490 part number.

Single Bipolar Transistors Replacement Considerations

Direct replacements include the BC490A and BC490B, which share identical pinouts and general electrical characteristics but may differ slightly in gain grouping or manufacturing lot specifications. Other compatible alternatives in the same family include the BC637, though designers must verify that the replacement meets the specific current and voltage requirements of the original circuit.