WHY5640 2.2 A Temperature Controller

  • Low cost
  • Master/Slave 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 (2 - 9): $69.00

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.

The WHY5640 is a general purpose, low cost, analog PI (Proportional, Integral) control loop for use in thermoelectric or resistive heater temperature control applications. The WHY5640 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 WHY5640 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.

WHY5640 vs. WTC3243:
– The WTC3243 incorporates remote voltage control and temperature monitor. The WHY5640 does not.
– The WTC3243 supports AD590 and LM335.
– The WHY5640 requires external circuits to operate anything other than resistive sensors.
– Two or more WHY5640s can be used together for more output current.
– If you do not need all the features of the WTC3243, the WHY5640 is a lower cost solution.
NOTE: The WHY5640 and WTC3243 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: 33 x 32 x 8 mm

WHY5640 Temperature Controller Pinout – Top View








NOTE: The WHY5640 and WTC3243 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?
FAQ1013: Why is there electrical noise on the device I'm trying to temperature control?
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)?
FAQ1065: What is the heatspreader temperature rise with the heatsink and fan attached?
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?
FAQ1128: What is the best way to wire a resistive heater to my temperature controller to gain compliance voltage?
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?


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


WHY5690Evaluation PCB for WHY5640 Temperature Controller$97
WTW002WTW002 Thermal Washer for Wxx Controllers$3
WHS302WHS302 Heatsink for WXX Controllers$15
WXC303WXC303 +5 V Fan$29
WXC304WXC304 +12 V Fan$29
WXC305WXC305 Screw Kit$6
TCS10K5TCS10K5 10 kΩ Thermistor (0.5x3mm) Sold in 5-packs$97
TCS605TCS605 5 kΩ Thermistor (2x3mm) Sold in 10-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

Related Parts

WLD3343WLD3343 2.2 A Laser Diode Driver$99WLD3343 2.2 A Laser Diode Driver
WTC3243WTC3243 2.2 A Temperature Controller$97wtc3243