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S4008LS3
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Product Detailed Parameters
- Description：SCR 400V 8A TO220
- Series：-
- Mfr：Littelfuse Inc.
- Package：Bulk
- Voltage - Off State：400 V
- Voltage - Gate Trigger (Vgt) (Max)：800 mV
- Current - Gate Trigger (Igt) (Max)：500 µA
- Current - Hold (Ih) (Max)：8 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：83A, 100A
- SCR Type：Sensitive Gate
- Operating Temperature：-40°C ~ 110°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3 Isolated Tab
- Supplier Device Package：TO-220 Isolated Tab
- Voltage - On State (Vtm) (Max)：1.6 V
- Current - On State (It (AV)) (Max)：5.1 A
- Current - On State (It (RMS)) (Max)：8:00 AM
- Current - Off State (Max)：5 µA
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Overview
The Littelfuse S4008LS3 is a Silicon Controlled Rectifier (SCR) from the Sxx08xSx series, designed for sensing applications. It features a maximum repetitive peak off-state voltage of 400V and an on-state current rating of 8A. The device is housed in a TO-220-2 package and exhibits a low holding current characteristic typical of sensitive gate thyristors. Key electrical parameters include a maximum gate trigger voltage and current suitable for direct logic interface, ensuring reliable turn-on with minimal control power. The component is manufactured by Littelfuse and complies with RoHS standards.
Feature Summary
- Sensitive gate structure enabling reliable triggering with low gate drive power
- High thermal stability provided by robust TO-220-2 packaging
- Low leakage current in the blocking state to minimize standby power loss
Applications
- AC motor speed control circuits
- Solid-state relay input stages
- Lighting dimmer controls
Procurement Notes
Verify the specific suffix 'TP' or 'T' against the manufacturer's official datasheet to confirm tape-and-reel versus tube packaging configurations. Ensure the voltage and current ratings align with the circuit's peak transient requirements. Cross-reference the pinout diagram for the TO-220-2 package to prevent mounting errors during assembly.
Selection Notes
Select this SCR when a sensitive gate device is required for low-power triggering applications. Compare the 400V rating against the system's line voltage peaks to ensure adequate safety margins. Consider the thermal resistance of the TO-220-2 package for heat sinking requirements under continuous load conditions.
Part Context
This component belongs to Littelfuse's general-purpose thyristor family, specifically optimized for industrial and consumer AC power control. The S4008LS3 variant offers a balance of high voltage blocking capability and moderate current handling, making it suitable for mid-range power switching tasks where precise gate sensitivity is beneficial.
Replacement Considerations
Consult Littelfuse's official cross-reference guide for verified equivalents. Common substitutes may include other 400V 8A SCRs from the same manufacturer series, provided the gate trigger characteristics and package dimensions are identical.
