View lm355 datasheet:

July 2003 WTC3243 (BOTTOM VIEW) Ultrastable Temperature Controller GENERAL DESCRIPTION FEATURES • Small Package (1.30” x 1.26” x 0.313”) The WTC3243 is an analog PI (Proportional, Integral) control loop hybrid circuit for use in • Ultrastable PI Control ultrastable temperature control applications. • High ±2 Amps Output Current The WTC3243 maintains precision temperature regulation using an adjustable sensor bias • Control Above and Below Ambient current and error amplifier circuit that operates • Voltage Controlled Setpoint directly with thermistors, RTDs, AD590 and LM335 type temperature sensors. Supply up to • Adjust Sensor Bias Current Source 2 Amps of heat and cool current to your • Adjustable Sensor Gain thermoelectric from a single +5 to +12 V