WLD3343 3 A Laser Diode Driver

  • Small Size: 1.30" X 1.28" X 0.313"
  • Slow Start Laser Diode Protection
  • TTL Compatible Shutdown Pin
  • Adjustable Laser Diode Current Limit
  • Over temperature output shutdown
  • 14 pin DIP PCB mount
  • Up to 3.0 A CW laser diode current
  • Constant Current or Constant Power Mode
  • Voltage Controlled Setpoint
  • Bandwidth 2 MHz (CC, sine wave)

From: $124.00

Bulk Pricing (2 - 9): $119.00

Contact Factory for OEM Pricing
Price adjustments will be reflected in the cart. For availability information please contact us. All prices are in US dollars and are subject to change without notice. Prices do not include shipping charges. An additional OEM discount applies on orders over 9 pieces. Contact factory for pricing. If ordering from or shipping to Australia, China, Hong Kong or Israel please contact your distributor.

This driver is not recommended for new designs.  It is being transitioned to a new version with more robust pins: WLD33ND-3A. A description of the changes and list of affected products can be found here.

The WLD3343-3A is a general purpose laser diode driver that maintains precision laser diode current (Constant Current mode) or stable photodiode current (Constant Power mode) using electronics that are compatible with any laser diode type. It delays and slowly ramps the current for maximum protection. Supply up to 3.0 A of current to your laser diode from a single +5 V power source.

An internal thermostat shuts down the WLD safely if the device temperature exceeds 105°C. This device operates to 45°C ambient temperature. Remotely enable or disable current. Current range is scaled by an external resistor.

For 2.2 A operation, the WLD3343 is available. These drivers have noise above 45 µA. To drive with lower noise in Constant Current Mode only, the WLD3343-2L and WLD3343-3L drive up to 2.2 A and 3 A, respectively. A circuit calculator tool speeds selection of external component values (see Design Tools tab). An evaluation board is available to simplify prototyping: WLD3393. Ask for the 3 A current range when ordering the evaluation board. Heatsinking solutions to use the WLD3343-3A at full current are available.

This laser diode driver is ideal for applications where space is tight. It is widely used in electro-optic qualificationRaman spectroscopy, medical diagnostic equipment, range finders, eye-safe atmospheric lidar and on research benches.

Free, effective, and responsive technical support is available to simplify integration of Wavelength products into your OEM design. Standard product can be easily modified to meet your application requirements.

1 Hour Current Stability at ambient 25°C: 200 ppm

Supply Range: +5 to +12 V

Package: 14 pin DIP PCB mount (33 x 32 x 8 mm)

Laser Diode Output Current: up to 3.0 A

Delay: 240 msec.
Current Ramp: 10 msec
Rise time: 460 nsec
Fall time: 320 nsec
Noise: >45 µA (100 mA, 100 kHz)
For low noise operation in Constant Current mode, see WLD3343-2L and WLD3343-3L.

TTL Compatible RESET / ENABLE input is active LO.

Bandwidth: 2 MHz – Constant Current sine wave

Maximum Power Dissipation 9 W (with full thermal kit)

Heatspreader Temperature Rise: 30°C / W without external heatsinking

Circuit Diagram Example: WLD3343 in Constant Current mode with a Type A/B Laser Diode (Top View)


WEV300WEV300 Thermal Solution Kit$23
WEV301WEV301 Thermal Solution Kit with +5 V Fan$48
WEV302WEV302 Thermal Solution Kit with +12 V Fan$48


WLD3393Evaluation PCB for WLD3343 Laser Diode Driver$150
WHS302WHS302 Heatsink for WXX Controllers$15
WTW002WTW002 Thermal Washer for Wxx Controllers$3
WXC303WXC303 +5 V Fan$31
WXC304WXC304 +12 V Fan$31
WXC305WXC305 Screw Kit$6

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