LDR31454 Discrete Semiconductor Products

Current - On State (It (AV)) (Max):	540A
Package / Case:	POW-R-BLOK™ Module
Mounting Type:	Chassis Mount
Operating Temperature:	-40°C ~ 130°C (TJ)
Current - Hold (Ih) (Max):	300mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	18000A, 17000A
Current - Gate Trigger (Igt) (Max):	250mA
Voltage - Gate Trigger (Vgt) (Max):	2.5V
Current - On State (It (RMS)) (Max):	845A
Series:	--
Voltage - Off State:	1.4kV
Number of SCRs, Diodes:	2 SCRs
Structure:	Series Connection - All SCRs
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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.Introduction The LDR31454 is an SCR module designed for medium and high power AC switch applications. The module combines an SCR with a sensing circuit in a single compact, energy efficient package. The module works with a wide range of input voltages and has a high reverse voltage tolerance. It is designed to provide robust protection against hot spot effects and input overvoltage. It offers high levels of reliability and can be used in a variety of applications including remote switching, motor controllers and lighting applications.Application Fields The LDR31454 is suitable for a variety of applications that require switching of medium and high power AC loads. It is particularly well suited for remote switching applications such as lighting controls, heating and air conditioning systems, motor controllers and industrial automation systems. The module is also suitable for a wide range of contactors, solenoids, rectifiers and other AC load switching applications.Working Principle The LDR31454 is a thyristor-based module that combines an SCR with a sensing circuit in a single compact package. The module operates as a bidirectional switch, allowing current to flow in either direction. A bias current is applied to the gate of the module, and the current flow is monitored by the sensing circuit. The module will remain off until a voltage is applied above the minimum gate trigger voltage, at which point it will become conducting. Once conducting, the module will remain on until the voltage falls below the minimum holding current, at which point it will again turn off.The module is designed to provide protection against hot spot and input overvoltage effects. It has a built-in temperature alarm that will sound an alarm and shut off the module if the internal temperature of the module exceeds a predetermined threshold. It is also designed to automatically shut off in the event of an overvoltage or an input current spike.Conclusion The LDR31454 is an SCR module designed for medium and high power AC switch applications. It is well suited for remote switching applications such as lighting controls, heating and air conditioning systems, motor controllers and industrial automation systems. The module operates as a bidirectional switch, allowing current to flow in either direction. It offers protection against hot spot and input overvoltage effects, as well as an integrated temperature alarm feature.

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