BC817K-40-QR

Overview

The Nexperia BC817K-40-QR is an NPN general-purpose bipolar junction transistor (BJT) designed for surface-mount applications. It operates with a maximum collector-emitter voltage of 45 V and supports a continuous collector current of 500 mA. The device features a minimum DC current gain (hFE) of 250, ensuring high amplification efficiency. Packaged in the compact SOT-323 form factor, it offers low thermal resistance and robust performance across a wide operating temperature range from -65°C to +150°C. This component is qualified under the AEC-Q101 standard, making it suitable for demanding automotive environments requiring reliable switching and amplification capabilities.

Feature Summary

• AEC-Q101 qualified for automotive reliability standards
• High DC current gain for efficient signal amplification
• Compact SOT-323 surface-mount package design

Applications

• Automotive electronic control units
• General-purpose switching circuits
• Audio frequency amplification stages

Procurement Notes

Verify the specific suffix 'QR' against official Nexperia documentation to confirm tape-and-reel packaging specifications and quantity per reel. Ensure the part number matches the exact electrical characteristics required for your circuit design, particularly regarding the hFE binning and thermal limits. Cross-reference the datasheet revision date to ensure compliance with current manufacturing standards and material declarations.

Selection Notes

Select this component when a small-footprint NPN transistor with high current gain is required for automotive or industrial applications. The SOT-323 package is ideal for space-constrained PCB layouts. Compare the 45V rating against system voltage peaks to ensure adequate margin. Consider the complementary PNP device for push-pull configurations if symmetrical performance is needed in the amplifier stage.

Part Context

This device belongs to the BC817 series of NPN general-purpose transistors manufactured by Nexperia. The series includes variants with different current gain bins, such as BC817-16 and BC817-25, catering to various amplification requirements. The BC817K-40-QR specifically denotes the high-gain variant packaged in SOT-323 with automotive qualification. It serves as a complement to the BC807 PNP series within the same product family.

Replacement Considerations

Direct substitutes include other AEC-Q101 qualified NPN transistors in SOT-323 packages with similar 45V/500mA ratings. Verify pinout compatibility and thermal characteristics before substitution. Generic equivalents may lack the specific automotive reliability certification required for original designs.