TC621

Features:

• User Programmable Hysteresis and Temperature Set Point
• Easily Programs with 2 External Resistors
• Wide Temperature Detection Range:
-0to 70: (TC620/TC621CCX)
-40 to +125: (TC620/TC621CVX)
-40 to +85: (TC620/TC621CEX)
-55to +125: (TC620/TC621CMX)
• Onboard Temperature Sensing Applications (TC620X)
• External NTC Thermistor for Remote Sensing Applications (TC621X)
• Available in 8-Pin PDIP and SOIC Packages




Application

• Power Supply Over Temperature Detection
• Consumer Equipment
• Temperature Regulators
• CPU Thermal Protection




Pinout

Specifications

Parameter NameValueTypical Accuracy (°)1Max Input/ Supply Current (A)400Max. Accuracy @ 25° (°)3Temp. Range (°C)-55 to 125Operating Voltage Range (V)4.5 to 18Device DescriptionLogic Output Temp Sensor

Parameter Name	Value
Typical Accuracy (°)	1
Max Input/ Supply Current (A)	400
Max. Accuracy @ 25° (°)	3
Temp. Range (°C)	-55 to 125
Operating Voltage Range (V)	4.5 to 18
Device Description	Logic Output Temp Sensor

Supply Voltage .............................................................. 20V
Input Voltage Any Input ......... (GND 0.3V) to (V_DD +0.3V)
Package Power Dissipation (T_A 70)
PDIP ..................................................................730mW
SOIC..................................................................470mW
Derating Factors:
Plastic .............................................................. 8mW/
Operating Temperature:
M Version................................................ -55to +125
V Version .............................................. -40 to +125
E Version ................................................ -40 to +85
C Version .................................................... 0 to +70
Storage Temperature .................................. -65 to +150

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

Description

TC620 and TC621 are programmable logic output temperature detectors designed for use in thermal management applications. The TC620 features an on-board temperature sensor, while the TC621 connects to an external NTC thermistor for remote sensing applications. Both devices feature dual thermal interrupt outputs (HIGH LIMIT and LOW LIMIT), each of which program with a single external resistor. On the TC620, these outputs are driven active (high) when measured temperature equals the user-programmed limits. The CONTROL (hysteresis) output of TC621 is driven high when temperature equals the high limit setting, and returns low when temperature falls below the low limit setting. This output can be used to provide simple ON/OFF control to a cooling fan or heater. The TC621 provides the same output functions except that the logical states are inverted. The TC620/621 are usable over a maximum temperature range of 40C to +125C.