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Littelfuse, S6055R, Thyristor, 600V 55A, 40mA 3-Pin, TO-220


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Overview of S6055R

The S6055R is a high-power silicon controlled rectifier (SCR) designed for high-current applications where precise control of alternating current (AC) power is required. This SCR is commonly used in industrial equipment, power supplies, motor controls, and other systems that demand reliable and efficient power regulation.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • Anode: Main terminal where the anode connection is made
  • Cathode: Main terminal where the cathode connection is made
  • Gate: Control terminal to trigger the SCR into conduction
  • A1: Auxiliary terminal 1 for additional functions
  • A2: Auxiliary terminal 2 for additional functions
  • K1: Thermal connection (heatsink)
  • K2: Thermal connection (heatsink)
  • GND: Ground connection
  • V+: Positive power supply connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the S6055R SCR for a visual representation.

Key Features

  • High Power Handling Capacity: The S6055R can handle high current loads, making it suitable for power control applications.
  • Triggering Options: Offers precise control with gate triggering for regulating power flow.
  • Robust Construction: Designed to withstand high temperatures and rugged operating conditions.
  • Reliable Performance: Ensures stable and consistent operation in demanding environments.
  • Wide Voltage Range: Compatible with a wide range of voltage inputs for versatile application scenarios.

Note: For detailed technical specifications, please refer to the S6055R datasheet.


  • Industrial Power Control: Ideal for controlling power in industrial machinery and equipment.
  • AC Motor Drives: Used in motor control circuits for precise speed and torque regulation.
  • Power Supplies: Applied in power supply units for voltage regulation and current control.
  • Heating Systems: Utilized in heating systems for accurate temperature control.


The S6055R SCR is a high-power semiconductor device that controls the flow of AC current in various electronic systems. It provides stable and efficient power regulation, making it essential for critical applications requiring precise current handling.

Usage Guide

  • Power Connection: Connect the anode and cathode terminals to the main power circuit.
  • Gate Control: Use the gate terminal to regulate the conduction of the SCR for power adjustment.
  • Thermal Management: Ensure proper heatsinking by connecting the thermal terminals to suitable heatsinks.

Frequently Asked Questions

Q: Is the S6055R suitable for high-temperature environments?
A: Yes, the S6055R is designed to operate reliably in high-temperature conditions, making it suitable for industrial applications.


For similar functionalities, consider these alternatives to the S6055R:

  • S6010R: A high-power SCR with comparable current handling capabilities and triggering options.
  • S8010R: This SCR offers enhanced power control features and reliability for demanding applications.
  • S6060R: An alternative high-power SCR with similar performance characteristics to the S6055R.


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Pbfree Code No Rohs Code Yes
Part Life Cycle Code Obsolete Ihs Manufacturer LITTELFUSE INC
Part Package Code TO-220AB Package Description FLANGE MOUNT, R-PSFM-T3
Pin Count 3 Reach Compliance Code
ECCN Code EAR99 HTS Code 8541.30.00.80
Samacsys Manufacturer LITTELFUSE Additional Feature HIGH RELIABILITY
Case Connection ANODE Circuit Commutated Turn-off Time-Nom 35 µs
Configuration SINGLE Critical Rate of Rise of Off-State Voltage-Min 375 V/us
DC Gate Trigger Current-Max 40 mA DC Gate Trigger Voltage-Max 1.5 V
Holding Current-Max 50 mA JEDEC-95 Code TO-220AB
JESD-30 Code R-PSFM-T3 JESD-609 Code e3
Leakage Current-Max 1 mA Non-Repetitive Pk On-state Cur 650 A
Number of Elements 1 Number of Terminals 3
On-state Current-Max 55000 A Operating Temperature-Max 125 °C
Operating Temperature-Min -40 °C Package Body Material PLASTIC/EPOXY
Package Shape RECTANGULAR Package Style FLANGE MOUNT
Peak Reflow Temperature (Cel) 260 Qualification Status Not Qualified
RMS On-state Current-Max 55 A Repetitive Peak Off-state Voltage 600 V
Repetitive Peak Reverse Voltage 600 V Surface Mount NO
Terminal Finish MATTE TIN Terminal Form THROUGH-HOLE
Terminal Position SINGLE Time@Peak Reflow Temperature-Max (s) 40
Trigger Device Type SCR

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