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SJ4020RTP
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Product Detailed Parameters
- Description：HIGH TJ 400V 20A SCR TO220R
- Series：SJ
- Mfr：Littelfuse Inc.
- Package：Tube
- Voltage - Off State：600 V
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：35 mA
- Current - Hold (Ih) (Max)：75 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：225A, 300A
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 150°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220AB
- Voltage - On State (Vtm) (Max)：1.6 V
- Current - On State (It (AV)) (Max)：12.8 A
- Current - On State (It (RMS)) (Max)：20 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse SJ4020RTP is a Silicon Controlled Rectifier (SCR) belonging to the SJxx20xx series, designed for through-hole mounting in TO-220-2 packages. It features a rated repetitive off-state voltage (VDRM) of 400 V and an RMS on-state current (It RMS) of 20 A. Key electrical parameters include a forward voltage drop (Vf) of 1.6 V, a gate trigger voltage (Vgt) of 1.5 V, and a gate trigger current (Igt) of 35 mA. The device exhibits a holding current (Ih) maximum of 75 mA and supports non-repetitive on-state currents up to 300 A. Operating temperatures range from -40°C to +150°C, with a maximum off-state leakage current of 10 µA at VDRM.
Feature Summary
- High thermal stability enabling operation at junction temperatures up to 150°C
- Robust surge handling capability with 300 A non-repetitive on-state current rating
- Standardized TO-220-2 through-hole package for efficient heat dissipation
Applications
- Industrial motor control circuits requiring high current switching
- AC power regulation systems utilizing phase control techniques
- Solid-state relay implementations for load management
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number SJ4020RTP with official Littelfuse documentation. Confirm that the physical marking on the TO-220-2 package matches the specified series designation. Ensure the supplier provides traceability data consistent with Littelfuse manufacturing standards before finalizing acquisition.
Selection Notes
Select this SCR when circuit requirements demand a 400 V blocking voltage and 20 A continuous current capacity in a standard through-hole form factor. Evaluate the 1.6 V forward voltage drop against thermal management constraints. Verify that the 35 mA gate trigger current aligns with the driving circuit's output capabilities for reliable turn-on performance.
Part Context
This component belongs to the SJxx20xx series of thyristors manufactured by Littelfuse. The series is categorized under general-purpose SCRs within the broader power control portfolio. The specific model utilizes a two-terminal silicon controlled rectifier architecture optimized for industrial power applications.
Replacement Considerations
Consult Littelfuse official substitution guides for compatible alternatives. Verify that any replacement maintains identical voltage ratings, current capacities, and package dimensions to ensure mechanical and electrical compatibility.
