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TELCOM SEMICONDUCTOR, INC.

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LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR

FEATURES

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Temperature Set Point Easily Programs with a

Single External Resistor

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Operates with 2.7V Power Supply (TC624)

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TO-220 Package for Direct Mounting to Heatsink

(TC622xAT) or Standard 8-Pin PDIP and SOIC

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Cost Effective

APPLICATIONS

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Power Supply Over-temperature Detection

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Consumer Electronics

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Fire/ Heat Detection

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UPS's, Amplifiers, Motors

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CPU Thermal Management in PC's

FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

The TC622 and TC624 are programmable solid state

temperature switches designed to replace mechanical

switches in sensing and control applications. Both devices

integrate the temperature sensor along with a voltage refer-

ence and all required detector circuitry to form a stand-alone

temperature switch. The desired temperature set point is

set by the user with a single external resistor.

Ambient temperature is sensed and compared to the

programmed setpoint. The OUT and OUT outputs are

driven to their active state when the measured temperature

exceeds the programmed setpoint.

GND

OUT

OUT

TEMPERATURE

TO VOLTAGE

CONVERTER

VOLTAGE

REFERENCE

GENERATOR

TEMP

SENSOR

ORDERING INFORMATION

Part No.

Voltage Operation

Package

Ambient Temperature

TC622COA

4.5V to 18V

8-Pin SOIC

0

°C to +70°C

TC622CPA

4.5V to 18V

8-Pin Plastic DIP

0

°C to +70°C

TC622EAT

4.5V to 18V

5-Pin TO-220

– 40

°C to +85°C

TC622EOA

4.5V to 18V

8-Pin SOIC

– 40

°C to +85°C

TC622EPA

4.5V to 18V

8-Pin Plastic DIP

– 40

°C to +85°C

TC622VAT

4.5V to 18V

5-Pin TO-220

– 40

°C to +125°C

TC622VOA

4.5V to 18V

8-Pin SOIC

– 40

°C to +125°C

TC622VPA

4.5V to 18V

8-Pin Plastic DIP

– 40

°C to +125°C

TC624COA

2.7V to 4.5V

8-Pin SOIC

0

°C to +70°C

TC624CPA

2.7V to 4.5V

8-Pin Plastic DIP

0

°C to +70°C

TC624EOA

2.7V to 4.5V

8-Pin SOIC

– 40

°C to +85°C

TC624EPA

2.7V to 4.5V

8-Pin Plastic DIP

– 40

°C to +85°C

TC624VOA

2.7V to 4.5V

8-Pin SOIC

– 40

°C to +125°C

TC624VPA

2.7V to 4.5V

8-Pin Plastic DIP

– 40

°C to +125°C

The TC622 has a power supply voltage range of 4.5V to

18.0V while the TC624 operates over a power supply range

of 2.7V to 4.5V. Both devices are usable over a temperature

range of – 40

°C to +125°C (TC622Vxx, TC624Vxx). Both

devices feature low supply current making them suitable for

many portable applications.

Eight-pin through-hole and surface mount packages are

available. The TC622 is also offered in a 5-pin TO-220

package.

TC622/24-4

9/25/96

TC622

TC624