ORDERING INFORMATION
PART NO DESCRIPTION
WTC32ND ±2.2 A Temperature Controller
WTC32ND-HB ±2.2 A Li-Ion Battery-Compatible
Temperature Controller
WTC32ND-EV Evaluation Board for WTC32ND
Temperature Controller
WEV300 Thermal Management Kit, no fan
WEV301 Thermal Management Kit, 5 V fan
WEV302 Thermal Management Kit, 12 V fan
PRECISION, STABILITY & VERSATILITY
The WTC32ND is a compact, analog PI (Proportional,
Integral) control loop circuit optimized for use in ultrastable
thermoelectric temperature control applications. It easily
handles variable operating conditions with a stability of better
than 0.0009ºC. The temperature setpoint is set by a remote
voltage signal. It is capable of controlling both thermoelectric
The WTC32ND-EV Evaluation Board is available to quickly
integrate the WTC32ND into your system and can be
optimized for sensor type. Use the adjustable trimpots to
integrator time constant.
BUILT-IN SAFETY
To protect the device, heat and cool limits can be set
independently. This safety feature guarantees that your
thermoelectric cooler will never be driven beyond your
LEADING EDGE APPLICATIONS
The robust and reliable WTC32ND has been designed
into electro-optical systems, airborne instrumentation,
spectroscopic monitors, and medical diagnostic
equipment. It is particularly well-suited to applications
where temperature is scanned across ambient.
FEATURES AND BENEFITS
• Linear PI Control Stability of 0.0009°C
• Heat and Cool Current Limits
• Adjustable Sensor Bias Current
• Drive ±2.2 A of TEC or Resistive Heater Current
• Small Size of 1.3” X 1.28” X 0.313”
• Supports Thermistors, RTDs, and IC Sensors
• Single Supply Operation: +5 V to +30 V
• 14-pin DIP PCB Mount
•Monitor Actual Temperature
• Quickly and easily integrated with WTC32ND-EV
Evaluation Board
CONTENTS
QUICK CONNECT GUIDE 2
WTC32ND-EV EVALUATION BOARD SCHEMATIC 4
PIN DESCRIPTIONS — WTC32ND 5
PIN DESCRIPTIONS — WTC32ND-EV EVAL BOARD 6
ELECTRICAL SPECIFICATIONS — WTC32ND 8
SAFETY INFO & THERMAL CONSIDERATIONS 11
OPERATING INSTRUCTIONS — WTC32ND + EVAL 12
DESIGN GUIDE — WTC32ND 20
ADDITIONAL TECHNICAL NOTES 28
TROUBLESHOOTING 32
MECHANICAL SPECIFICATIONS 34
CABLING SPECIFICATIONS 36
CERTIFICATION AND WARRANTY 37
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WTC32ND & WTC32ND-EV
Ultrastable TEC Controller & Evaluation Board
DATASHEET AND OPERATING GUIDE
WTC32ND
WTC32ND-EV
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