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S2055W81
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Product Detailed Parameters
- Description：SCR 200V 55A TO218X
- Series：-
- Mfr：Littelfuse Inc.
- Package：Bulk
- Voltage - Off State：200 V
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：40 mA
- Current - Hold (Ih) (Max)：60 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：550A, 650A
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-218X-3
- Supplier Device Package：TO-218X Non-Isolated Mounting Tab
- Voltage - On State (Vtm) (Max)：1.8 V
- Current - On State (It (AV)) (Max)：35 A
- Current - On State (It (RMS)) (Max)：55 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse S2055W81 is a Silicon Controlled Rectifier (SCR) component manufactured by Littelfuse Inc. It belongs to the S2055W series, which are general-purpose thyristors designed for power control applications. The device features a standard leaded package configuration suitable for through-hole mounting on printed circuit boards. As an SCR, it operates as a latching switch, conducting current in one direction when triggered by a gate signal and maintaining conduction until the anode current drops below the holding threshold. This specific part number variant includes a suffix indicating a particular voltage or current rating within the broader S2055W family, intended for use in AC/DC conversion, motor control, and lighting dimming circuits where reliable switching is required.
Feature Summary
- Provides unidirectional current flow with latching behavior upon gate triggering
- Designed for robust performance in general-purpose power control environments
- Utilizes a standard through-hole package for easy integration into PCB assemblies
Applications
- AC/DC power supply rectification circuits
- Solid-state relay implementations
- Lighting dimmer and phase-control applications
Procurement Notes
Verify the exact electrical ratings corresponding to the '81' suffix against the official Littelfuse datasheet before procurement. Confirm that the component status aligns with project lifecycle requirements, as availability may vary. Ensure compatibility with existing thermal management and gate drive circuitry specifications.
Selection Notes
Select this component based on its specific voltage and current ratings defined by the suffix. Compare the gate trigger characteristics with the driving circuit capabilities. Evaluate the thermal resistance and package size constraints of the target application to ensure proper heat dissipation and physical fitment on the board.
Part Context
The S2055W81 is part of the S2055W series from Littelfuse, a line of silicon controlled rectifiers. These devices are commonly used in industrial and consumer electronics for controlling AC power. The series offers various voltage and current options, with the suffix denoting specific performance parameters within the family.
Replacement Considerations
Consult Littelfuse documentation for direct cross-references. Verify pinout compatibility and electrical equivalence if substituting with other SCR manufacturers. Ensure the replacement meets the same voltage, current, and thermal requirements.
