WHY56ND 2.2 A Temperature Controller

  • Low cost
  • Master/Booster for more current
  • Single supply operation: +5 to +26 V
  • Linear PI control
  • Drive ±2.2A of TEC or RH current
  • Small size: 1.3" x 1.28" x 0.313"
  • Heat and cool current limits
  • 14 pin DIP PCB mount

From: $78.00

Bulk Pricing (6 - 14): $76.00

Contact Factory for High Volume 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 14 pieces. Contact factory for pricing. If ordering from or shipping to Australia, China, Hong Kong or Israel please contact your distributor.

The WHY56ND is a general purpose, low cost, analog PI (Proportional, Integral) control loop for use in thermoelectric or resistive heater temperature control applications. The WHY maintains precision temperature regulation using an active resistor bridge circuit that operates directly with thermistors or RTD temperature sensors. Supply up to 2.2 Amps of heat and cool current to your thermoelectric from a single power supply. Accessories include a heatsink WHS302, thermal washer WTW002, and fans WXC303 (5 V), WXC304 (12 V), and an evaluation board WHY5690.

Connect two or more WHY units together and drive higher output currents. A single resistor or trimpot sets the temperature setpoint. Independent heat and cool current limits are set by single resistors. A single resistor sets proportional gain. A resistor/capacitor in series sets the integrator time constant.

WHY56ND vs. WTC32ND:
– The WTC32ND incorporates remote voltage control and temperature monitor. The WHY56ND does not.
– The WTC32ND supports AD590 and LM335.
– The WHY56ND requires external circuits to operate anything other than resistive sensors.
– Two or more WHY56NDs can be used together for more output current.
– If you do not need all the features of the WTC32ND, the WHY56ND is a lower cost solution.
NOTE: The WHY56ND and WTC32ND do NOT have the same pin configuration.

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.

Supply Range: +5 to +26 V
Temperature Control Output Current: up to ±2.2 A
Temperature Stability: 0.005°C (10 kΩ thermistor at 25°C) over one hour

Setpoint vs. Actual Temperature Accuracy: Can be <1% depending on external circuit precision – no actual temperature monitor point

-Heat and Cool Current Limits
-PI controller minimizes overshoot and time to temperature
-Compatible with resistive sensors (thermistors, RTDs)
-Can operate with unipolar current for Resistive Heaters

Maximum Power Dissipation: 9 W
Heatspreader Temperature Rise: 30°C / W without external heatsinking

14 pin DIP PCB Mount size: 1.3″ x 1.28″ x 0.31″

WHY56ND Temperature Controller Pinout – Top View








NOTE: The WHY56ND and WTC32ND do NOT have the same pin configuration.

Related FAQs

FAQ1007: What limits the temperature control range of a temperature controller?
FAQ1009: Why won't my temperature controller settle my load to temperature?
FAQ1010: Why does it take so long to settle to the setpoint temperature?
FAQ1011: Why won't my load stabilize to your temperature controller specification?
FAQ1012: Why is my load heating when it should be cooling?
FAQ1014: What DC power supplies do you recommend to achieve the stability specifications listed in your manuals?
FAQ1015: Should I use a switching power supply for my application?
FAQ1016: How do I view and print your manuals on-line?
FAQ1017: An empty screen appears when I try opening a PDF manual. What does this mean?
FAQ1019: Which address do I use to remit payment or a purchase order?
FAQ1022: Where do I send my unit for repair or calibration?
FAQ1050: I use the WLD3343 in collaboration with the WHY5640 and a Peltier element to keep the laser diode temperature constant. After I set the LD current to 40 mA and start changing the temperature from about 16°C to 50°C the LD current starts to rise to 60 mA. Does that have to do with the characteristic's of the LD? I know that some things vary depending on the temperature but then I would expect the WLD3343 to adjust the current. It does keep the current constant very well if the temperature stays constant.
FAQ1057: I am planning on using the WHY5640 with the WEV302 heatsink/fan assembly. How is the WXC304 fan terminated (i.e. what type of connector, if any, is on it)?
FAQ1085: Do the temperature controllers always provide full current to the driven element (a TEC or Peltier device, or resistive heater) when the actual temperature does not equal the set point temperature?
FAQ1093: What is the thickness of the plastic on the Wxx products' case (WLD3343 Laser Driver, WTC3243 Temperature Controller or WHY5640 Temperature Controller) and what is the thermal conductivity of the plastic case?
FAQ1117: The temperature of my resistive heater is slow to stabilize and is not within specification.
FAQ1120: What does the Compliance Voltage specification in temperature controllers mean?
FAQ1158: What software can I use for mechanical downloads?
FAQ1161: What are some important parameters to consider before purchasing a product?
FAQ1163: How does grounding the thermoelectric cooler cable on temperature controllers affect the noise level?
FAQ1169: At what temperature, and for how long can I solder the pins on the WLD, WTC, WTCP, and WHY products?
FAQ1171: How do I connect multiple drivers or controllers to a single power supply?


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


WHY56ND-EVEvaluation PCB for WHY56ND Temperature Controller$188
WTW002WTW002 Thermal Washer for Wxx Controllers$3
WHS302WHS302 Heatsink for WXX Controllers$15
WXC303WXC303 +5 V Fan$31
WXC304WXC304 +12 V Fan$31
WXC305WXC305 Screw Kit$6
TCS10K5TCS10K5 10 kΩ Thermistor (0.5x3mm) Sold in 5-packs$97
TCS610TCS610 10 kΩ Thermistor (2x3mm) Sold in 10-packs$97
TCS620TCS620 20 kΩ Thermistor (2x3mm) Sold in 10-packs$97
TCS650TCS650 50 kΩ Thermistor (2x3mm) Sold in 10-packs$97
TCS651TCS651 100 kΩ Thermistor (2x3mm) Sold in 10-packs$97