MCR08MT1

Overview

The onsemi MCR08MT1 is a sensitive gate silicon controlled rectifier (SCR) designed for line-powered consumer applications. It operates in a surface-mount SOT-223 package and supports peak repetitive off-state voltages of 200 V (MCR08B) or 600 V (MCR08M). The device handles an RMS on-state current of 0.8 A and a peak non-repetitive surge current of 8.0 A. Key electrical characteristics include a maximum gate trigger current of 200 µA, a holding current of 5.0 mA, and a peak forward on-state voltage of 1.7 V at 1.0 A peak. It functions within a junction temperature range of -40°C to +110°C.

Feature Summary

• Sensitive gate design enables reliable triggering with minimal gate drive current.
• Glass passivated surface construction ensures reliability and uniformity under operating conditions.
• Reverse blocking capability allows operation in circuits requiring bidirectional voltage blocking.
• Surface mount packaging facilitates automated manufacturing processes.

Applications

• Relay and lamp drivers
• Small motor controls
• Gate drivers for larger thyristors
• Sensing and detection circuits

Procurement Notes

Verify the specific voltage rating suffix required for the application: 'B' indicates a 200 V rating, while 'M' indicates a 600 V rating. Confirm that the ordering part number includes the 'G' suffix to ensure the component is lead-free and RoHS compliant. Check the tape and reel specifications brochure for correct part orientation and tape dimensions before placing orders.

Selection Notes

Select the MCR08B variant for circuits requiring a 200 V blocking voltage, or the MCR08M variant for up to 600 V. Ensure the gate trigger circuit can supply at least 200 µA to guarantee turn-on. Design the PCB copper tab area according to thermal resistance curves to manage heat dissipation effectively within the specified junction temperature limits.

Part Context

This component belongs to the MCR08 series of sensitive gate SCRs manufactured by onsemi. It shares the same physical SOT-223 footprint and general electrical structure as the MCR08B and MCR08M variants, differing primarily in their rated blocking voltage capabilities. The series is intended for compact, automated assembly in consumer electronics.

Replacement Considerations

Direct pin-compatible replacements must match the SOT-223 package and sensitive gate characteristics. Verify that any substitute SCR meets or exceeds the 0.8 A RMS current rating and the specific voltage requirement (200 V or 600 V). Ensure the replacement's gate trigger current remains low enough for the existing driver circuitry.

FAQ

What is the difference between the MCR08B and MCR08M variants?

The primary difference is the peak repetitive off-state voltage rating. The MCR08B is rated for 200 V, while the MCR08M is rated for 600 V. All other listed electrical characteristics and physical dimensions remain consistent between the two variants.

How is the pinout configured for the SOT-223 package?

Pin 1 is the Cathode, Pin 2 is the Anode, Pin 3 is the Gate, and Pin 4 is also connected to the Anode. This configuration allows the anode tab to serve as a secondary connection point for improved thermal performance.

What is the maximum allowable soldering temperature?

The maximum device temperature for soldering purposes is 260°C, with a maximum duration of 10 seconds. Exceeding these limits may damage the device.