BC817K-40

Overview

The Diotec Semiconductor BC817K-40 is a single NPN general-purpose transistor housed in an SOT-23 (TO-236) surface-mount package. It supports a maximum collector current of 500 mA and a collector-emitter voltage of 45 V, with a power dissipation rating of up to 500 mW on a PCB. The device features a gain-bandwidth product of 170 MHz at 50 mA and offers three distinct DC current gain groups. Specifically, the -40 suffix designates a minimum hFE of 250 at 100 mA and 1 V, extending up to 630.

Feature Summary

• Low thermal resistance construction for efficient heat dissipation
• Three selectable current gain groups for precise circuit matching
• Compliant with RoHS, REACH, and Conflict Minerals regulations

Applications

• General-purpose signal processing
• Electronic switching circuits
• Amplification stages

Procurement Notes

Verify that the specific part number includes the K suffix to confirm low thermal resistance characteristics. Ensure compliance requirements such as RoHS and REACH are explicitly stated in the final purchase documentation. Confirm the manufacturing date code aligns with project timelines, as datasheet versions may update specifications without notice.

Selection Notes

Select this component when a high-gain NPN transistor is required in a compact SOT-23 footprint. The -40 designation ensures a higher minimum DC current gain compared to standard variants. Consider the 500 mA continuous collector current limit and the 500 mW power dissipation capability under optimal board mounting conditions during thermal design.

Part Context

This component belongs to the BC817K series of SMD general-purpose NPN transistors manufactured by Diotec Semiconductor. The 'K' variant specifically denotes enhanced thermal performance relative to standard packages. It serves as the NPN counterpart within the broader BC817/BC807 family, designed for commercial and industrial grade applications requiring reliable switching and amplification.

Replacement Considerations

The complementary PNP transistor for this component is the BC818K-40. For direct pin-compatible replacements from other manufacturers, verify that the substitute maintains the 500 mA current rating, 45 V breakdown voltage, and the specific high-gain (-40) classification.

FAQ

What does the 'K' suffix indicate in the BC817K-40 model?

The 'K' suffix indicates that the transistor has low thermal resistance.

What is the typical gain-bandwidth product (fT) for this device?

The typical gain-bandwidth product is 170 MHz, measured at VCE = 5 V and IC = 50 mA.

How is the marking code identified for the BC817K-40?

The marking code for the BC817K-40 is '6C' or '6CT'.