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The A2631 from Avago Technologies (now part of Broadcom Inc.) is an optocoupler (also known as an optoisolator). It's commonly used for isolated gate driving of power transistors like IGBTs or MOSFETs.

🔹 A2631 – Key Features

• Type: High-speed optocoupler / gate driver

• Function: Isolated IGBT/MOSFET gate driver

• Output Type: Open collector transistor

• Input: Infrared LED (integrated)

• Isolation Voltage: Typically 3750 Vrms

• Data Rate: Up to 10 MBd

• CTR (Current Transfer Ratio): Defined by device grade

• Propagation Delay: Typically 100–300 ns, depending on load and conditions

• Common-mode Transient Immunity (CMTI): High CMTI, suitable for fast switching

🔹 Package Options 🔹 Typical Applications

• Isolated IGBT and MOSFET gate drive

• Inverters and motor drives

• Switch-mode power supplies (SMPS)

• Industrial control systems

• UPS systems

🔹 Pinout (Typical 8-pin SO/DIP)

Note: Always consult the exact datasheet to confirm pin configuration for your variant.

🔹 Important Notes

• Often used with external gate resistors for controlling turn-on/turn-off speeds

• May include desaturation detection and fault feedback in enhanced versions (check exact part suffix)

Would you like the full datasheet, application note, or a reference design for using the A2631 with an IGBT or MOSFET?