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S4008LTP
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Product Detailed Parameters
- Description：SCR 400V 8A TO220AB-L
- Series：-
- Mfr：Littelfuse Inc.
- Package：Tube
- Voltage - Off State：400 V
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：15 mA
- Current - Hold (Ih) (Max)：30 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：83A, 100A
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3 Isolated Tab
- Supplier Device Package：TO-220AB-L
- 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)：10 µA
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Overview
The Littelfuse S4008LTP is a silicon controlled rectifier (SCR) designed for high-power switching applications. It features an 8 A RMS on-state current and a 400 V repetitive peak off-state voltage rating. The device utilizes a sensitive gate structure with a maximum gate trigger current of 500 uA, enabling efficient control with low drive power. Housed in a TO-220AB package, it supports through-hole mounting and operates within a junction temperature range of -40 °C to +110 °C. Key electrical characteristics include a forward voltage drop of 1.6 V and a non-repetitive peak on-state current capability of 100 A.
Feature Summary
- Sensitive gate architecture requiring minimal trigger current for reliable activation
- Robust thermal management via flange-mountable TO-220AB package
- High surge current handling capacity for transient protection scenarios
Applications
- Industrial motor speed control circuits
- Solid-state relay designs
- General purpose AC power switching
Procurement Notes
Verify the specific datasheet revision when sourcing, as Littelfuse product specifications may undergo updates. Confirm that the TO-220AB package dimensions match your PCB footprint requirements. Ensure the sensitive gate characteristic aligns with your driver circuit's output impedance to prevent false triggering during operation.
Selection Notes
Select this component for applications requiring moderate current switching with precise gate control. The 400 V rating suits lower voltage AC systems. Consider thermal derating at elevated ambient temperatures. Compare against standard gate variants if higher noise immunity is required for harsh environments.
Part Context
This SCR belongs to the S4008 series, which provides standardized 8 A performance levels. The 'L' suffix typically denotes the leaded package configuration. This part serves as a fundamental building block for thyristor-based power control modules within Littelfuse's broader circuit protection portfolio.
Replacement Considerations
Direct substitutes include the S4008FS3112 or S4008DS3RP from Littelfuse, provided the package and pinout compatibility are verified. Cross-brand replacements must match the 8 A RMS current and 400 V voltage ratings precisely.
