SFH620A-2

Overview

The SFH620A-2 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductors. It features an NPN phototransistor output housed in a PDIP-4 through-hole package. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 100 mA, and a power dissipation of 250 mW. The device provides an insulation voltage of 5300 Vrms with a forward voltage of 1.65 V at a maximum forward current of 60 mA. The current transfer ratio ranges from 63% to 200%, while rise and fall times are both specified at 2 µs. Operating temperatures span from -55°C to +100°C.

Feature Summary

• Provides high-voltage isolation capability via a 5300 Vrms insulation rating between input and output circuits.
• Utilizes an NPN phototransistor output stage for reliable signal transmission in digital switching applications.
• Designed for through-hole mounting in a compact PDIP-4 package suitable for standard PCB layouts.

Applications

• General-purpose signal isolation in industrial control systems
• Interface circuits for microprocessors and logic devices
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix designation against official Vishay documentation to confirm the exact Current Transfer Ratio (CTR) binning, as variants within the SFH620A series differ in gain specifications. Ensure that the procurement order matches the required isolation voltage and package type listed in the manufacturer's datasheet to prevent integration errors in the final assembly.

Selection Notes

Select this component when a single-channel isolation barrier with moderate speed and high voltage tolerance is required. The 70 V collector-emitter voltage and 100 mA collector current support standard logic-level switching loads. Consider the 2 µs transition time for timing-sensitive designs and verify thermal management requirements given the 250 mW power dissipation limit in the DIP-4 package.

Part Context

The SFH620A-2 belongs to the SFH620A family of transistor output optocouplers produced by Vishay Semiconductor Opto Division. This series is characterized by its use of gallium arsenide infrared LEDs coupled with silicon NPN phototransistors. The family offers various CTR bins to accommodate different circuit gain requirements while maintaining consistent physical dimensions and electrical interface characteristics across the lineup.

Replacement Considerations

Direct substitutes within the same family include the SFH620A-1 and SFH620A-3, which share identical pinouts and mechanical dimensions but offer different Current Transfer Ratio ranges. Verify that the alternative part number meets the specific CTR requirements of the design before substitution.