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S4040RQ2TP
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Product Detailed Parameters
- Description：SCR 400V 40A TO220
- Series：-
- Mfr：Littelfuse Inc.
- Package：Tube
- 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)：430A, 520A
- 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)：25 A
- Current - On State (It (RMS)) (Max)：40 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse S4040RQ2TP is a Teccor brand SCR from the S4040xQx series, rated for 40 A RMS on-state current and 400 V blocking voltage. It features a low turn-off time (tq) of 12 µs maximum, making it suitable for high-frequency switching applications. The device utilizes a TO-220AB package with non-isolated mounting tab. Key electrical characteristics include a gate trigger current (IGT) range of 30 to 45 mA, peak non-repetitive surge current of 520 A at 60 Hz, and a critical rate of rise of on-state current (di/dt) of 175 A/µs. It operates within a junction temperature range of -40°C to 125°C.
Feature Summary
- Fast turn-off time (tq) optimized for power inverters and switching regulators
- High dv/dt and di/dt capabilities for high-frequency pulse circuits
- Glass-passivated junctions for parameter stability and reliability
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 500 units per base quantity as documented in the manufacturer's packing options table. Confirm the 'Q2' designation corresponds to the 12 µs turn-off time variant. Ensure the ordering part number matches the required TO-220AB package form factor for the target application design.
Selection Notes
Select this component when a 40 A SCR with a 12 µs turn-off time is required. The Q2 variant offers a gate trigger current range of 30 to 45 mA, distinct from the standard Q or fast Q3 variants. Consider the TO-220AB package dimensions and thermal resistance values (RθJC of 0.6 °C/W) for heat sink design. Verify that the application's peak surge currents remain below the 520 A limit at 60 Hz.
Part Context
This part belongs to the S4040xQx series of 40 Amp Low Tq SCRs manufactured by Littelfuse under the Teccor brand. The series includes variants with different turn-off times (Q, Q2, Q3) and packages (TO-220AB, TO-263). The S4040RQ2TP specifically denotes the 400V, 40A device with 12 µs tq in a TO-220AB tube package.
Replacement Considerations
Direct substitutes within the same series include S4040RQ (15 µs tq) and S4040RQ3 (5 µs tq), provided the gate trigger current and turn-off time requirements align. Cross-package replacements like S4040NQ2TP are available in TO-263 but require PCB layout adjustments.
