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S4040RQTP
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Product Detailed Parameters
- Description：SCR 400V 40A TO220AB
- Series：Teccor®
- Mfr：Littelfuse Inc.
- Package：Tube
- Voltage - Off State：400 V
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：35 mA
- Current - Hold (Ih) (Max)：70 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：430A, 520A
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 125°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220AB
- Voltage - On State (Vtm) (Max)：1.8 V
- Current - On State (It (AV)) (Max)：25 A
- Current - On State (It (RMS)) (Max)：40 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse S4040RQTP is a 40 Amp, 400 Volt Silicon Controlled Rectifier (SCR) from the S4040xQx series, designed for fast turn-off time applications. It features a TO-220AB package with a non-isolated mounting tab and matte tin-plated leads. The device supports an RMS on-state current of 40 A at 100°C case temperature and an average on-state current of 25.0 A. Peak non-repetitive surge current reaches 520 A at 60 Hz. Gate trigger current ranges from 15 to 35 mA, with a maximum gate trigger voltage of 1.5 V. The junction-to-case thermal resistance is 0.6 °C/W, and the operating junction temperature range spans -40°C to 125°C.
Feature Summary
- Fast turn-off time characteristics suitable for high-frequency switching circuits exceeding 1000 PPS.
- High dv/dt capability of 650 V/µs minimum at 100°C for reliable operation in noisy environments.
- Glass-passivated junctions provide robust protection against environmental stressors.
- RoHS compliant construction utilizing copper alloy leads with 100% matte tin plating.
Applications
- Multi-phase voltage regulator circuits
- DC/AC inverters
- Higher frequency pulsing power supplies
Procurement Notes
Verify the specific suffix 'TP' indicates tube packaging containing 50 units per tube, totaling 500 units per base quantity. Confirm the 'R' designation corresponds to the TO-220AB lead form option. Ensure the component matches the S4040xQx series specifications for low turn-off time requirements before procurement.
Selection Notes
Select this component when fast turn-off times are critical for circuit performance. The S4040RQ variant offers a maximum turn-off time of 15 µs. Designers should ensure the application operates within the 75% continuous current rating limit to extend device life. Proper heat sinking is required to manage the 0.6 °C/W junction-to-case thermal resistance effectively.
Part Context
This part belongs to the Teccor brand S4040xQx series of 40 Amp Low Tq SCRs manufactured by Littelfuse. The series includes variants with different turn-off times (Q, Q2, Q3) and packages (TO-220AB, TO-263). The S4040RQTP specifically denotes the standard sensitivity version in a tube-packed TO-220AB package.
Replacement Considerations
Substitutes must match the 40A current rating, 400V blocking voltage, and TO-220AB package. Verify that alternative devices offer comparable turn-off times (tq) and gate trigger currents to maintain circuit stability in high-frequency applications.
