2SC3917

Overview

The onsemi 2SC3917 is a high-voltage NPN silicon epitaxial planar transistor designed for general-purpose switching and amplification applications. It features a collector-emitter voltage rating of 400V and a continuous collector current capability of 0.5A. The device incorporates an integrated base resistor, simplifying circuit design by reducing component count and board space requirements. Key electrical characteristics include a DC current gain (hFE) ranging from 10 to 60 at a collector current of 10mA, and a low saturation voltage. Packaged in a compact SOT-89 surface-mount configuration, it offers reliable performance for power management and signal processing tasks in consumer electronics and industrial equipment.

Feature Summary

• Integrated base resistor eliminates external biasing components
• High breakdown voltage suitable for demanding switching environments
• Compact surface-mount package for automated assembly

Applications

• General-purpose switching circuits
• Driver stages for relays and solenoids
• Voltage regulator output transistors
• Inverter circuits in small appliances

Procurement Notes

Verify the exact ordering suffix against the manufacturer's official datasheet to ensure correct packaging and tape-and-reel specifications. Confirm that the procurement channel provides traceable documentation matching the original onsemi manufacturing records. Check for any specific handling instructions related to electrostatic discharge protection during storage and installation.

Selection Notes

Select this component when a high-voltage NPN switch with built-in base resistance is required. Ensure the operating collector current remains within the 0.5A limit and that thermal dissipation capabilities match the application's heat sink or PCB copper area constraints. Verify that the required current gain meets the minimum threshold for the intended load drive conditions.

Part Context

This transistor belongs to onsemi's family of high-voltage bipolar junction transistors designed for robust performance in compact form factors. The SOT-89 package allows for efficient thermal transfer while maintaining a small footprint compared to traditional through-hole alternatives. It serves as a direct replacement for various legacy discrete transistors requiring similar voltage and current ratings with added integration benefits.

Replacement Considerations

• 2SC3917YFJL

FAQ

What is the function of the integrated resistor?

The integrated base resistor limits the base current, protecting the transistor from excessive drive currents and simplifying the surrounding circuit design by removing the need for an external biasing resistor.

What is the maximum collector-emitter voltage?

The maximum collector-emitter voltage (VCEO) is rated at 400V, making it suitable for high-voltage switching applications.

What package type does this component use?

The 2SC3917 is housed in a SOT-89 surface-mount package, which provides a compact solution for automated PCB assembly.