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MCR68-2G
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Product Detailed Parameters
- Description：SCR 50V 12A TO220AB
- Series：-
- Mfr：Littelfuse Inc.
- Package：Box
- Voltage - Off State：50 V
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：30 mA
- Current - Hold (Ih) (Max)：50 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：100A @ 60Hz
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220AB
- Voltage - On State (Vtm) (Max)：2.2 V
- Current - On State (It (AV)) (Max)：8:00 AM
- Current - On State (It (RMS)) (Max)：12:00 AM
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse MCR68-2G is a silicon-controlled rectifier (SCR) designed for overvoltage protection in crowbar circuits. It features glass-passivated junctions and center-gate geometry to ensure parameter stability and uniform current spreading. The device operates within a junction temperature range of -40°C to +125°C and utilizes a TO-220AB package. Key electrical ratings include a peak repetitive off-state voltage of 50 V, an on-state RMS current of 12 A, and a high peak discharge current capability of 300 A.
Feature Summary
- Glass-passivated junctions provide enhanced parameter stability and long-term reliability.
- Center-gate geometry enables uniform current spreading for high discharge current handling.
- Thermowatt package construction ensures low thermal resistance and maximum power dissipation.
Applications
- Overvoltage protection in crowbar circuits
- High capacitor discharge applications
Procurement Notes
Verify the specific ordering suffix against the manufacturer's documentation before purchase. Confirm that the required package variant matches the project specifications. Ensure the component meets all necessary environmental standards for the intended deployment environment.
Selection Notes
Select this component when a 50 V blocking voltage and 12 A RMS current rating are required. The high 300 A peak discharge current makes it suitable for demanding crowbar applications. Verify that the TO-220AB package fits the available board space and mounting constraints.
Part Context
This part belongs to the MCR68 series of silicon-controlled rectifiers from Littelfuse. The series is characterized by rugged construction and high surge capabilities. The MCR68-2G specifically denotes the lead-free version of the standard MCR68-2 device.
Replacement Considerations
Direct replacements must match the 50 V rating, 12 A RMS current, and TO-220AB package. Verify gate trigger characteristics and thermal resistance values to ensure circuit compatibility.
FAQ
What is the peak non-repetitive surge current rating?
The peak non-repetitive surge current (ITSM) is rated at 100 A for a 1/2 cycle sine wave at 60 Hz with a junction temperature of 125°C.
How does the center-gate geometry benefit the device?
The center-gate geometry allows for uniform current spreading across the silicon wafer, which enables the device to handle higher discharge currents compared to standard designs.
What is the maximum operating junction temperature?
The operating junction temperature range extends up to +125°C.
