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MCR69-3G
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Product Detailed Parameters
- Description：SCR 100V 25A TO220AB
- Series：-
- Mfr：Littelfuse Inc.
- Package：Tube
- Voltage - Off State：100 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)：300A @ 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)：1.8 V
- Current - On State (It (AV)) (Max)：16 A
- Current - On State (It (RMS)) (Max)：25 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse MCR69-3G is a lead-free Silicon Controlled Rectifier (SCR) housed in a TO-220AB thermowatt package. It features glass-passivated junctions and center-gate geometry for uniform current spreading. The device supports a peak repetitive off-state voltage of 100V, with a peak discharge current capability of 750A and an on-state RMS current of 25A at 85°C case temperature. Thermal resistance from junction to case is 1.5°C/W, allowing operation within a junction temperature range of -40°C to +125°C.
Feature Summary
- Center-gate geometry enables high discharge current handling through uniform current spreading.
- Glass-passivated junctions provide enhanced parameter stability and long-term reliability.
- Thermowall package construction ensures low thermal resistance and maximum power dissipation durability.
Applications
- Overvoltage protection in crowbar circuits
- High capacitor discharge current applications
- General overvoltage protection systems
Procurement Notes
Verify the specific suffix 'G' indicates a lead-free package configuration as documented in the ordering information. Confirm that the TO-220AB mechanical dimensions align with the target PCB mounting requirements. Ensure gate trigger parameters meet the driving circuit specifications before finalizing component selection.
Selection Notes
Select this component when a 100V blocking voltage rating is required alongside high surge current capabilities up to 750A. The TO-220AB package is suitable for applications requiring robust heat dissipation via a heatsink. Verify that the gate trigger current and voltage limits are compatible with the control logic interface.
Part Context
This part belongs to the MCR69 series of silicon controlled rectifiers designed for high-reliability industrial applications. The series utilizes a rugged thermowall package to manage significant power dissipation. The MCR69-3 variant specifically targets lower voltage blocking requirements compared to higher-rated siblings in the same family.
Replacement Considerations
The MCR69-2 serves as a functional alternative within the same series, offering identical mechanical and thermal characteristics but with a reduced peak repetitive off-state voltage rating of 50V instead of 100V.
FAQ
What is the peak discharge current capability of the MCR69-3?
The device can handle a peak discharge current of 750 Amps.
How does the center-gate geometry benefit performance?
It ensures uniform current spreading across the silicon chip, which enables the device to handle high discharge currents effectively.
What is the thermal resistance from junction to case?
The thermal resistance (RθJC) is specified as 1.5 °C/W.
