What is Thermoflagger™ ?

Thermoflagger™ Configuration

Thermoflagger™ provides a simple solution for detecting overtemperature conditions in conjunction with PTC thermistors.

Thermoflagger™ outputs the FLAG signal when it detects a change in the characteristics of a PTC thermistor.
Since multiple PTC thermistors can be connected in series with Thermoflagger™, it can monitor multiple locations for overtemperature conditions.
Thermoflagger™ allows you to realize overtemperature detection easily.

Example of PTC thermistor characteristics Resistance vs temperature

A PTC thermistor is a type of electronic device whose resistance increases dramatically when its temperature exceeds a certain point. 

※PTC : Positive Temperature Coefficient

Lineup of Thermoflagger™
We plan to expand our lineup with various voltage resistances and packages in the future.

Part number

PTCO
Output current
[Note 1]

PTC thermistor resistance range

FLAG output latch

 FLAG output configuration
[Note 2]

TCTH011AE

1μA

4.7kΩ ~ 10kΩ

-

Push-pull

TCTH012AE

1μA

4.7kΩ ~ 10kΩ

✔

Push-pull

TCTH021AE

10μA

470Ω ~ 1kΩ

-

Push-pull

TCTH022AE

10μA

470Ω ~ 1kΩ

✔

Push-pull

TCTH011BE

1μA

4.7kΩ ~ 10kΩ

-

Open-drain

TCTH012BE

1μA

4.7kΩ ~ 10kΩ

✔

Open-drain

TCTH021BE

10μA

470Ω ~ 1kΩ

-

Open-drain
TCTH022BE 10μA 470Ω ~ 1kΩ ✔ Open-drain

[Note 1] PTCO output current is a constant current supplied from Thermoflagger™ to the PTC thermistor.
[Note 2] When Thermoflagger™ detects an abnormality, it outputs a FLAG signal. The push-pull type consists of two MOSFETs stacked vertically, and the output current can flow in either direction. The open-drain type consists of one MOSFET, and the output current can only flow in one direction.

Basic of Thermoflagger™

The need for overheating (temperature) monitoring
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Basic operations of Thermoflagger™
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Using Thermoflagger™
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Feature 1: Simplifies circuit design for overtemperature detection
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Feature 2: Low-cost solution for monitoring multiple locations for overtemperature conditions
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Feature 3: Supports failsafe design (1)
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Feature 3: Supports failsafe design (2)
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Application example for Thermoflagger™
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Application of Thermoflagger™ (reference design)
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Related information

Back to Basic of Thermoflagger™

* Thermoflagger™ is a trademark of Toshiba Electronic Devices & Storage Corporation.
* Other company names, product names, and service names may be trademarks of their respective companies.

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