BC850B

Overview

The BC850B is a general-purpose NPN silicon epitaxial planar transistor manufactured by Diotec Semiconductor. It operates with a maximum collector current of 100 mA and a collector-emitter voltage of 45 V. The device provides three selectable DC current gain groups (A, B, C) to accommodate various amplification requirements. It features a transition frequency of 300 MHz and a power dissipation rating of 250 mW in industrial grades. The component is housed in an SOT-23 surface-mount package.

Feature Summary

• Offers three distinct DC current gain groups for flexible signal processing applications
• Utilizes gold bond wires for standard industrial and automotive grades
• Designed for high-frequency operation with a 300 MHz transition frequency
• Compliant with RoHS directives without exemptions

Applications

• General purpose amplifier circuits
• Electronic switching applications
• Signal processing tasks

Procurement Notes

Verify the specific suffix against official documentation to confirm the manufacturing grade. The absence of a suffix indicates industrial grade, while the -C suffix denotes commercial grade. Confirm AEC-Q101 compliance if automotive qualification is required. Ensure the ordering code matches the desired current gain group. Cross-reference datasheet version dates for accurate thermal and electrical specifications.

Selection Notes

Select this component based on the required collector-emitter voltage of 45 V and the 100 mA current limit. Choose the appropriate current gain group (A, B, or C) to match circuit amplification needs. Verify that the SOT-23 package fits the board layout constraints. Consider the 250 mW power dissipation capability relative to the operating temperature range.

Part Context

This part belongs to the BC846 through BC850 series of SMD universal NPN transistors. The series shares common mechanical dimensions and basic operational principles across different voltage ratings. The BC850 variant specifically targets applications requiring 45 V breakdown characteristics within the same family ecosystem.

Replacement Considerations

BC846B

FAQ

What is the difference between the BC850B and BC850B-C?

The BC850B represents the industrial grade which utilizes gold bond wires and supports up to 300 mW power dissipation. The BC850B-C is the commercial grade, which uses copper bond wires and has a reduced power dissipation rating of 200 mW.

Does the BC850B meet automotive standards?

The standard BC850B does not inherently carry automotive qualifications. Only parts with the -Q or -AQ suffixes are compliant or qualified according to the AEC-Q101 standard.

What is the typical DC current gain range for Group B?

For Group B, the minimum DC current gain is 180 at a collector current of 2 mA and a collector-emitter voltage of 5 V.