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S4055R
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Product Detailed Parameters
- Description：SCR 400V 55A TO220
- Series：-
- Mfr：Littelfuse Inc.
- Package：Bulk
- Voltage - Off State：400 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-220-3
- Supplier Device Package：TO-220 Non-Isolated 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 S4055R is a Silicon Controlled Rectifier (SCR) from the Teccor Sxx55x series, designed for high-current power control applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an RMS on-state current (IT(RMS)) of 55 A. The device utilizes a TO-220-2 through-hole package for robust mounting. Key electrical characteristics include a maximum gate trigger current (IGT) of 40 mA and a forward voltage drop (VF) of 1.8 V at rated current. It operates within a junction temperature range of -40°C to +125°C and exhibits a holding current (IH) maximum of 60 mA.
Feature Summary
- High current handling capability with 55 A RMS rating for demanding power loads
- Robust thermal management via TO-220-2 through-hole packaging
- Low gate sensitivity requiring minimal trigger current for reliable switching
Applications
- Industrial motor speed control systems
- AC power regulation circuits
- Lighting dimmer applications
Procurement Notes
Verify the specific suffix against official Littelfuse documentation to confirm exact pinout and mechanical dimensions. Ensure the selected variant matches the required voltage and current ratings for the target circuit design. Cross-reference datasheet revisions to confirm compliance with current RoHS standards before finalizing procurement specifications.
Selection Notes
Select this component when a 400 V blocking voltage and 55 A continuous current capacity are required in a through-hole configuration. Evaluate the thermal resistance of the TO-220-2 package against the expected heat dissipation in the application. Confirm that the gate trigger requirements align with the driving circuit's output capabilities to ensure reliable turn-on under all operating conditions.
Part Context
The S4055R belongs to the Teccor Sxx55x family of SCRs, which are engineered for general-purpose power switching. This series provides a balance of high current density and ruggedness suitable for industrial environments. The part represents a standard solution for AC phase control where moderate voltage blocking and high current throughput are primary design constraints.
Replacement Considerations
Direct replacements must match the 55 A IT(RMS), 400 V VDRM, and TO-220-2 package. Verify equivalent gate trigger characteristics and thermal performance. Consult Littelfuse or distributor databases for cross-referenced parts with identical electrical ratings and physical footprint compatibility.
