WTC32ND 2.2 A Temperature Controller

  • Ultrastable PI control
  • Drive ±2.2A of TEC or RH current
  • Linear Stability: 0.0009°C
  • Small size: 1.3" x 1.28" x 0.313"
  • Heat and cool current limits
  • Supports Thermistors, RTDs, IC sensors
  • Single supply operation: +5 V to +30 V
  • Adjustable sensor bias current
  • 14 pin DIP PCB mount
  • Monitor Actual Temperature

From: $99.00

Bulk Pricing (6 - 14): $97.00

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 compact design of the WTC32ND Temperature Controller achieves 0.0009°C temperature stability. Its award winning package can be integrated with a heatsink WHS302, thermal washer WTW002, and fans WXC303 (+5 V) or WXC304 (+12 V) for easy prototyping. The linear, PI control loop offers maximum stability while the bipolar current source has been designed for higher efficiency. The WTC32ND drives up to 2.2 A for either Thermoelectrics (bipolar) or Resistive Heaters (unipolar). An evaluation board simplifies prototyping: WTC32ND-EV. A model compatible with Li-ion batteries is available: WTC32ND-HB.

The WTC32ND temperature controller is easily configured for any design. A circuit calculator tool speeds selection of external component values (see Design Tools tab). Virtually any type of temperature sensor can be used with it and a built in sensor bias current source simplifies use with resistive temperature sensors. The Proportional Gain (P) and Integrator Time Constant (I) are set by external resistors and can be modified to optimize temperature overshoot and stability.

Other features offer added flexibility. Independent heat and cool current limits are set by single resistors. An onboard reference voltage simplifies potentiometer control of the temperature setpoint. You can also choose to operate remotely with an external setpoint voltage. Monitor actual sensor voltage at pin 9.

The robust and reliable WTC32ND-HB is designed into handheld electro-optical systems, eye-safe atmospheric lidar, airborne instrumentation, Raman spectrometers and medical diagnostic equipment. The WTC is particularly suited to applications where temperature is scanned across ambient.

Wavelength provides the free LabVIEW Virtual Instrument executable file for use with the WTC32ND-EV Evaluation Board. Click here to download. The executable VI also requires the 2017 LabVIEW Run-Time Engine, available for free download from the National Instruments website:, as well as the DAQmx Viewer also available for free from the NI website:

The source code for the LabVIEW Virtual Instrument module is available for free in case you wish to modify the program yourself. Alternately, Wavelength can customize the Virtual Instrument to suit your application. Contact a Sales Engineer for assistance.

WTC32ND vs. WHY56ND:
– 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. The standard product can be easily modified to meet your application requirements.

Supply Range: +5 to +30 V
Temperature Control Output Current: up to ±2.2 A
Temperature Stability: 0.0009°C (10 kΩ thermistor at 25°C) over one hour
Stability across ambient: 0.002°C (10 kΩ thermistor at 25°C) over an hour – Ideal for scanning applications

Setpoint vs. Actual Temperature Accuracy: 2 mV typical

-Heat and Cool Current Limits
-PI controller minimizes overshoot and time to temperature
-Compatible with multiple sensors
-Adjustable sensor bias current optimizes sensor feedback voltage
-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: 33 x 32 x 8 mm

WTC32ND 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?
FAQ1048: How do I know whether or not I need a heat sink or a fan on my WTC3243 thermoelectric temperature controller?
FAQ1055: I'm using the WTC3243 to drive a TEC using a 10kΩ thermistor. How do I get a measurement of the actual temperature (or something proportional to it)?
FAQ1060: My question has to do with the EXT VSET connector on the WTC3243. How is the voltage I apply to the EXT VSET related to the temperature setting? What is the relationship between this applied voltage and the temperature that will result as the set value? I cannot find a transfer function in the manual.
FAQ1063: I have a 4.5 V TEC that can draw (up to) 2.85 A. Based on your WTC3243 datasheet I believe I would require a supply voltage of 6.06 V. I will limit the current applied to 2.3 A via the current-limit resistors. Based on the info in your datasheet I will be running in zone 2 (middle shade of blue) of your "Safe Operating Area" plot. This indicates to me that my design will require a heatsink plus a 3.5 CFM fan. Am I more or less correct here?
FAQ1064: I have a WTC set up so the current limiting is set to 1.2 A (3.12 kΩ) on the cooling side (LIMA) and 0 A (1.5 kΩ) on the heating side (LIMB). Why is the WTC3243 able to put out as much as 1.8 A when the set point called for more cooling current than the LIMA setting was supposed to allow? Just how 'hard' is the current limiting---brick wall cutoff or really soft, or somewhere in between?
FAQ1066: I am using the WTC3243 and I would like to know if I could use a single power supply for both VDD and VS?
FAQ1067: Using the WTC3243 for controlling the temperature of an aluminum block, at 1 A with a 12 V power supply, what is the power generated?
FAQ1068: I am developing a new design with the WTC3243 and WLD3343. Is it necessary to feed both circuits with a regulated power supply? Is a rectified voltage with a "smoothing" capacitor sufficient?
FAQ1071: Would any overheating issues arise from placing the WLD3343 and WTC3243 in a closed area ~ 7"x5"x3"? If so, would the associated thermal solution kits help to relieve this problem?
FAQ1076: We would like to use the WLD and WTC to control a fiber-coupled laser diode which has laser diode anode ground. This ground is connected via the case to the thermistor ground. We are not using the photodiode, we scan through a range of currents to wavelength-tune the laser. When I look at your specification for the WLD, the picture on page 13 shows the laser diode anode connected to pin 14 i.e. 5 V. None of the other circuits show a grounded laser anode. Is the WLD in fact compatible with an anode ground system? I'm worried because I can't see how it can be, if its supply is 0 and 5 V, yet I need to connect the cathode to something less than 0 V.
FAQ1082: What sensor would you recommend to be used with the WTC series temp controller: an AD590 temp transducer or a thermistor? Would a larger mass increase the stability?
FAQ1083: Battery power for Laser Drivers and Temperature Controllers - can the laser diode driver and temperature controller be powered by batteries directly?
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?
FAQ1094: What is the thickness of the plastic on the WTC3243 case and what is its (the plastic case's) thermal conductivity?
FAQ1096: I am looking for a temperature controller so that I can maintain a constant 37°C in a petri dish. This application would require internal immersion heaters.
FAQ1105: We operate a WLD and a WTC together from one power supply and want to build this in series and need to specify the power supply:
  1. What stability of the power supply is necessary, what ripple is allowed?
  2. Do you have any kind of overload protection?
  3. Would it do any harm to have a capacitor (i.e. 470 pF) in parallel to the laser diode?

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


WTC32ND-EVEvaluation PCB for WTC32ND 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

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