TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
Package Type
8-PDIP
• User Programmable Hysteresis and
Temperature Set Point
NC
V
1
2
3
4
8
DD
• Easily Programs with Two External Resistors
• Wide Temperature Detection Range:
- 0°C to 70°C: (TC620/TC621CCX)
HIGH LIMIT
LOW SET
HIGH SET
GND
7
6
5
TC620XCPA
TC620XEPA
LOW LIMIT
CONTROL
- -40°C to +125°C: (TC620/TC621CVX)
- -40°C to +85°C: (TC620/TC621CEX)
8-PDIP
• Onboard Temperature Sensing Applications
(TC620X)
THERMISTOR
V
1
8
DD
HIGH LIMIT
2
3
4
HIGH SET
LOW SET
GND
7
6
5
TC621XCPA
TC621XEPA
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
LOW LIMIT
CONTROL
• Available in 8-Pin PDIP and SOIC Packages
8-SOIC
V
NC
LOW SET
HIGH SET
GND
1
2
3
4
8
7
6
5
Applications
DD
LOW LIMIT
HIGH LIMIT
TC620XCOA
TC620XEOA
TC620CVOA
• Power Supply Over Temperature Detection
• Consumer Equipment
CONTROL
• Temperature Regulators
8-SOIC
• CPU Thermal Protection
THERMISTOR
V
1
2
3
4
8
DD
HIGH LIMIT
HIGH SET
LOW SET
GND
7
6
5
Device Selection Table
TC621XCOA
TC621XEOA
LOW LIMIT
CONTROL
Temperature
Range
Part Number
Package
TC620X*COA
TC620X*CPA
TC620X*EOA
TC620X*EPA
TC620C*VOA
TC621X*COA
TC621X*CPA
TC621X*EOA
TC621X*EPA
TC621C*VOA
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
0°C to +70°C
0°C to +70°C
General Description
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal
management applications. The TC620 features an
onboard temperature sensor, while the TC621
connects to an external NTC thermistor for remote
sensing applications.
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
0°C to +70°C
0°C to +70°C
Both devices feature dual thermal interrupt outputs
(HIGH LIMIT and LOW LIMIT), each of which is pro-
grammed 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 is driven high when tem-
perature equals the high limit setting and returns low
when temperature falls below the low limit setting. This
output can be used to provide ON/OFF control to a
cooling fan or heater. The TC621 provides the same
output functions except that the logical states are
inverted.
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
Note:
*The part code will be C or H (see
Functional Block Diagrams).
The TC620/TC621 are usable over operating
temperature ranges of 0°C to 70°C, -40°C to +125°C.
2001-2015 Microchip Technology Inc.
DS20001439E-page 1