BRT21-H

Overview

The BRT21-H is a phototriac output optocoupler featuring an integrated zero-crossing detector, manufactured by Vishay Semiconductor Opto Division. It provides electrical isolation between input and output circuits with a high static dv/dt rating of 10,000 V/µs. The device utilizes a DIP-6 package and supports a peak repetitive off-state voltage (VDRM) of up to 400 V. Key electrical parameters include a maximum trigger current (IFT) of less than 2 mA and an RMS on-state current (ITRMS) of 300 mA. It operates within a temperature range of -40°C to +150°C.

Feature Summary

• Integrated zero-voltage crossing detection circuit for precise phase control
• High input sensitivity with low trigger current requirements
• High static dv/dt capability to prevent false triggering
• Electrical insulation between input and output circuits

Applications

• Solid state relays
• Motor controls
• Lighting dimmers

Procurement Notes

Verify the specific suffix 'H' indicates the DIP-6 package variant with VDRM ≤ 400 V. Confirm RoHS compliance status (-e3 designation). Ensure the application voltage does not exceed the rated 400 V limit. Check for availability through authorized distributors as stock levels vary.

Selection Notes

Select this component when zero-crossing switching is required to minimize electromagnetic interference. Compare with BRT22-H and BRT23-H if higher voltage ratings are needed. Consider surface mount alternatives like BRT21-M if PCB space is limited. Verify input current compatibility with the microcomputer interface.

Part Context

Part of the Vishay BRT21/22/23 family of phototriac output optocouplers. This series is designed for AC power switching applications requiring galvanic isolation. The BRT21-H specifically denotes the 400 V version in the standard DIP-6 through-hole package.

Replacement Considerations

Direct substitutes include BRT22-H (600 V) and BRT23-H (800 V) for higher voltage needs. Surface mount equivalents are BRT21-M, BRT22-M, and BRT23-M.