temperature control unit (tcu)

Temperature Control Units (TCUs) provide precise temperature regulation for wafer chucks, process chambers, and other critical process zones. **Precision**: Control to fractions of a degree celsius. Process uniformity depends on temperature stability. **Applications**: Electrostatic chuck temperature in etch/deposition, photoresist bake plates, CVD chamber walls, implanter targets. **Technology**: Recirculating fluid (water, glycol, oil) or thermoelectric elements. PID control loops. **Heating and cooling**: Many TCUs can both heat and cool, allowing rapid temperature transitions. **Heat transfer fluid**: Water for near-ambient, oil for high temperature applications. Fluid selection based on temperature range. **Response time**: Fast response for dynamic processes. Minimize thermal lag. **Integration**: Communicate with tool controller for recipe-based temperature profiles. **Maintenance**: Fluid changes, pump service, temperature sensor calibration. **Setpoint range**: Different units for different ranges - near ambient, elevated temperature, cryogenic. **Control stability**: Better than 0.1 degrees C stability typical for critical processes.