Lambda / TDK / EMI LPD425

The Lambda LPD425 is an EMI filter and power supply unit engineered to suppress electromagnetic interference across industrial and electronic applications. It delivers constant voltage or constant current operation with automatic crossover, supported by integrated metering and precision current limiting control. Built for regulatory compliance and field reliability, the unit combines compact architecture with effective noise attenuation to meet demanding EMI suppression requirements.

Technical Specifications

• AC input: 105–132 VAC at 47–440 Hz


• Derating applies for 47–53 Hz operation (10% current reduction); 57–63 Hz ratings apply nominally


• Maximum DC voltage capability: 500 V between +DC or −DC terminal and chassis ground; 300 V maximum between either output terminal and ground Operating Modes


• Constant Voltage or Constant Current with automatic crossover


• Single ten-turn potentiometer for current limiter adjustment

Key Features

• Integrated voltmeter and ammeter on all LPD series models


• Selectable grounding: negative, positive, or floating output terminal configurations


• Excellent EMI attenuation characteristics for noise suppression


• Compact footprint enabling space-constrained installations


• RoHS compliant construction


• Safety agency approvals

Typical Applications The LPD425 serves applications demanding precision voltage or current regulation with integrated EMI filtering - industrial control systems, test benches, laboratory power distribution, and equipment requiring regulatory electromagnetic compatibility certification.

Compatibility & Integration The unit supports negative or positive grounding schemes, providing flexible integration into systems with varied ground architectures. Integrated metering eliminates the need for external monitoring instrumentation in bench and production environments.