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SK255KDTP
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Product Detailed Parameters
- Description：SCR 1.2KV 55A TO218AC
- Series：-
- Mfr：Littelfuse Inc.
- Package：Tube
- Voltage - Off State：1.2 kV
- Voltage - Gate Trigger (Vgt) (Max)：1.5 V
- Current - Gate Trigger (Igt) (Max)：50 mA
- Current - Hold (Ih) (Max)：120 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm)：-
- SCR Type：Standard Recovery
- Operating Temperature：-40°C ~ 125°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Through Hole
- Package / Case：TO-218-3
- Supplier Device Package：TO-218AC
- Voltage - On State (Vtm) (Max)：1.6 V
- Current - On State (It (AV)) (Max)：35 A
- Current - On State (It (RMS)) (Max)：55 A
- Current - Off State (Max)：10 µA
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Overview
The Littelfuse SK255KDTP is a standard silicon-controlled rectifier (SCR) designed for phase control applications. It features an electrically isolated TO-218AC package with a 1200 V repetitive peak off-state voltage rating and a 55 A RMS on-state current capability at 60°C case temperature. The device requires a gate trigger current of up to 50 mA and supports a non-repetitive surge current of 620 A at 60 Hz. It operates within a junction temperature range of -40°C to 125°C and includes UL recognition for isolation requirements.
Feature Summary
- Electrically isolated KD package recognized by UL for 2500 VRMS isolation
- Sensitive gate triggering requiring minimal current for activation
- High surge current capability suitable for demanding switching environments
Applications
- AC solid-state switches
- Industrial power tools
- Line rectification at 50/60 Hz
- Heating controls
- Motor speed controls
Procurement Notes
Verify the specific ordering suffix 'TP' corresponds to tube packaging containing 30 units per base, totaling 3600 units per base quantity. Confirm that the component meets RoHS compliance standards and matches the exact electrical ratings required for the target circuit design before finalizing procurement orders.
Selection Notes
Select this SCR for applications requiring high voltage blocking and moderate current handling in isolated configurations. Ensure the thermal management system maintains the case temperature below 60°C to sustain the full 55 A RMS rating. Verify that the gate drive circuit can supply the necessary 50 mA trigger current under all operating temperature conditions.
Part Context
This component belongs to the SK255KD Series of 55 Amp Standard SCRs manufactured by Littelfuse. The series provides robust switching solutions for industrial and consumer electronics. The specific model utilizes the TO-218AC form factor, which facilitates mounting on heat sinks while providing electrical isolation between the main terminals and the mounting surface.
Replacement Considerations
Substitute components must match the 1200 V voltage rating, 55 A current capacity, and TO-218AC isolated package type. Verify that any replacement device offers comparable gate sensitivity and surge current capabilities to ensure circuit compatibility without redesigning the thermal or control interfaces.
