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S4X8ES1AP
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Product Detailed Parameters
- Description：SCR 400V 800MA TO92
- Series：-
- Mfr：Littelfuse Inc.
- Package：Tape & Box (TB)
- Voltage - Off State：400 V
- Voltage - Gate Trigger (Vgt) (Max)：800 mV
- Current - Gate Trigger (Igt) (Max)：5 µA
- Current - Hold (Ih) (Max)：5 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：8A, 10A
- SCR Type：Sensitive Gate
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Supplier Device Package：TO-92
- Voltage - On State (Vtm) (Max)：1.7 V
- Current - On State (It (AV)) (Max)：510 mA
- Current - On State (It (RMS)) (Max)：800 mA
- Current - Off State (Max)：3 µA
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Overview
The Littelfuse S4X8ES1AP is a silicon-controlled rectifier (SCR) from the SxX8xS series, designed for sensitive gate triggering applications. It features an RMS on-state current of 800 mA and a rated repetitive off-state voltage of 400 V. The device operates within a temperature range of -40°C to +125°C and utilizes a surface-mount SOT-223-3 package. Key electrical parameters include a maximum holding current of 5 mA, a forward voltage of 1.7 V, and a gate trigger current of 200 µA at 800 mV. It exhibits a low leakage current of 3 µA under rated voltage conditions.
Feature Summary
- Sensitive gate architecture enabling reliable triggering with low input power requirements
- Surface-mount construction optimized for automated PCB assembly processes
- High thermal stability supporting operation in elevated temperature environments
Applications
- AC power control circuits requiring compact form factors
- Solid-state relay driver stages
- Lighting dimmer modules
Procurement Notes
Verify the specific suffix AP against official Littelfuse documentation to confirm exact tape-and-reel specifications or marking variations. Ensure compatibility with standard reflow soldering profiles compatible with SOT-223 packages. Cross-reference datasheet revisions to confirm RoHS compliance status prior to procurement.
Selection Notes
Select this component when a 400 V blocking capability and 800 mA continuous current are required in a small footprint. The sensitive gate characteristic simplifies drive circuit design by reducing the necessary trigger current compared to standard gate devices. Verify that the SOT-223 thermal dissipation meets the application's junction temperature constraints.
Part Context
This SCR belongs to the SxX8xS family, which provides various voltage and current ratings in standardized packages. The S4 prefix indicates the 400 V voltage class, while the X8 denotes the 800 mA current rating. This series is engineered for general-purpose switching applications where space efficiency and reliable latching behavior are prioritized.
Replacement Considerations
Direct pin-compatible substitutes may exist within the same SxX8xS series with different voltage ratings, such as S6X8ES1AP for 600 V applications. Verify that any replacement maintains the same sensitive gate trigger characteristics and package outline dimensions.
