Description

Thyristor MCR100-6 – Sensitive Gate SCR for Low-Power Control Applications

The MCR100-6 Thyristor is a compact and reliable Silicon Controlled Rectifier (SCR) designed for low-power switching and control applications. Known for its sensitive gate triggering, compact size, and stable electrical characteristics, the MCR100-6 is widely used in light dimmers, motor speed controllers, power regulators, alarm circuits, and industrial control systems.

With a repetitive peak off-state voltage of 600V and an average on-state current rating of 0.8A, the MCR100-6 offers dependable performance in AC and DC control circuits where precise triggering and efficient power handling are required. Its small signal SCR design makes it ideal for compact electronic assemblies and cost-sensitive designs.

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What Is a Thyristor (SCR)?

A thyristor, also known as a Silicon Controlled Rectifier, is a four-layer semiconductor device used primarily for power control and switching. Once triggered via the gate terminal, the SCR remains in the ON state until the current drops below a certain holding value.

SCRs like the MCR100-6 are commonly used in:

• AC power control

• Phase-angle control circuits

• Over-voltage protection

• Switching and latching applications

Learn more about how thyristors work:
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-7/thyristors/

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Sensitive Gate Triggering

One of the most important features of the MCR100-6 is its sensitive gate, which allows the device to be triggered using very low gate current. This makes it compatible with:

• Logic-level control circuits

• Microcontrollers

• Low-power driver stages

Sensitive gate SCRs reduce the need for additional driver components, simplifying circuit design and improving efficiency.

Understanding gate triggering in SCRs:
https://www.electronics-tutorials.ws/power/silicon-controlled-rectifier.html

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600V Blocking Voltage for Reliable Operation

The “-6” suffix in MCR100-6 indicates a 600V peak repetitive off-state voltage (VDRM / VRRM). This high voltage capability ensures safe and reliable operation in AC mains-related circuits and environments with voltage transients.

High blocking voltage allows the thyristor to withstand:

• AC line fluctuations

• Inductive load spikes

• Switching transients

This makes the MCR100-6 suitable for both residential and industrial control systems.

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0.8A On-State Current Rating

The MCR100-6 is rated for an average on-state current of approximately 0.8A, making it ideal for low to moderate power loads. While compact in size, it provides sufficient current handling for many control and switching applications without the need for bulky power devices.

It is commonly used where:

• Load currents are under 1 amp

• Compact design is required

• Low power dissipation is preferred

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Compact TO-92 Package

The thyristor is typically supplied in a TO-92 through-hole package, which offers:

• Small footprint

• Easy PCB mounting

• Low manufacturing cost

• Simple heat management for low-power circuits

The TO-92 package is widely used in consumer electronics and control modules, making the MCR100-6 easy to integrate into new designs or use as a replacement component.

More about semiconductor packages:
https://www.electronics-notes.com/articles/electronic_components/packages/semiconductor-packages.php

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Thermal Stability and Reliability

Manufactured using high-quality silicon processes, the MCR100-6 thyristor provides stable performance across a wide operating temperature range. Proper heat dissipation and operation within rated limits ensure long service life and reliable switching behavior.

Its rugged construction allows it to perform well in repetitive switching and phase-control applications.

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Common Applications

The MCR100-6 SCR is widely used in:

• Light dimmer circuits

• Motor speed controllers

• AC power control modules

• Battery chargers

• Alarm and triggering circuits

• Relay drivers

• Industrial automation systems

• Educational and hobby electronics projects

Its sensitive gate and compact design make it especially popular in low-power AC control applications.

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Key Specifications Overview

• Device type: Thyristor / SCR

• Model: MCR100-6

• Peak repetitive off-state voltage: 600V

• Average on-state current: ~0.8A

• Gate sensitivity: Sensitive gate

• Package type: TO-92

• Mounting type: Through-hole

• Application: Power control and switching

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Why Choose the MCR100-6 Thyristor?

The MCR100-6 offers an excellent balance of high voltage capability, low gate trigger current, compact size, and dependable performance. It is an ideal choice for designers and technicians who need reliable SCR functionality in low-power applications without complex drive circuitry.

Whether used in consumer electronics, industrial controls, or educational projects, the MCR100-6 thyristor delivers consistent and efficient operation.