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LDTC Series

The LDTC Laser Diode Driver and Temperature Controller combines Wavelength’s proprietary FL500 and highly stable WTC3243 in one compact module.

Additional information

  • Low noise LD current of 500 mA (LDTC0520) or 1 A (LCTC1020)
  • Slow-Start & Brownout Protection
  • Constant Current or Constant Power
  • Adjustable Laser Diode Current Limit
  • Remote TTL Shutdown or Interlock
  • Small package 2.35" x 2.9" x 1.075"
  • Failsafe Setpoint default for D/A
  • Drive ±2.2 A of TEC or RH Current
  • Single Power Supply Operation
  • Chassis mount includes all cables

LDTC modules are in use around the world providing trouble-free reliability in range finders, telecom laser modules, military-aerospace research and development, airborne metrology, academic research, laser diode LIV testers, and more.


The LDTC module requires minimal overhead electronics, so your engineers can focus on high-level design features that differentiate you from your competitor. The compact LDTC is easily mounted in your laser system, with latching connectors for easy manufacturing. The flexibility of the LDTC design allows the controller to be operated from a single power supply. The power supplies can also be separated, if your application requires higher compliance voltage.


The laser driver is based on the popular FL500, known for low noise output and trouble-free operation. Two models are available, providing either 500 mA (LDTC0520) or 1.0 A output current (LDTC1020). The current limit circuit cleanly clamps laser diode current without ringing or overshoot, and recovers without inducing a phase shift in a modulated laser signal.

The temperature controller is designed around the WTC3243, the ultra-stable temperature control module known for the ability to sweep load temperature across ambient. Independent cooling- and heating-current limits allow the LDTC to be used with thermoelectric coolers or resistive heaters and either negative or positive temperature coefficient sensors.

Remote computer control is available using the USBKIT, which also allows graphing and datalogging.


+44 (0) 1829 773155

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Next day delivery for UK webshop orders received before 12 noon, subject to stock availability.

All prices shown exclude VAT and delivery.

Delivery charge for UK webshop orders - £8.50 excl VAT.

Non-UK orders - Delivery is based on weight of order.

Non-UK orders - Local import duties and taxes are not included.