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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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How do I select a PTC thermistor to use with Thermoflagger™?
The PTC thermistor used with Thermoflagger™ should be selected considering the IC detect voltage/constant current and PTC thermistor characteristic.
The TCTH0 series is provided with a constant current of IPTCO10μA/1μA (Typ.) at the PTCO terminal.
A FLAG signal is output when the voltage at the PTCO voltage (PTC thermistor combined resistance×IPTCO) exceeds the detect voltage VDET 0.5V (Typ.).
The PTC thermistor combined resistance×IPTCO > VDET
For the TCTH01 Series. When the PTC thermistor combined resistance exceeds 500kΩ (Typ.), the IC outputs a FLAG signal.
For the TCTH02 series. When the PTC thermistor combined resistance exceeds 50kΩ (Typ.), the IC outputs a FLAG signal.
The temperature at which the combined resistance of the PTC thermistor becomes 500kΩ/50kΩ is the reference for the detection temperature.
| Characteristics | Symbol | Test condition | Tj = 25°C | Tj = -40 to 125°C | Unit | |||
|---|---|---|---|---|---|---|---|---|
| Min | Typ. | Max | Min | Max | ||||
| PTCO output current | IPTCO | TCTH01xxE, VDD = 1.7V to 5.5V | 0.8 | 1.00 | 1.22 | 0.72 | 1.32 | μA |
| TCTH02xxE, VDD = 1.7V to 5.5V | 8.0 | 10.0 | 12.2 | 7.2 | 13.2 | |||
| Detect Voltage | VDET | VDD = 3.3V | 0.42 | 0.50 | 0.58 | 0.36 | 0.64 | V |
The following table shows the selection table for Thermoflagger™ and Murata Manufacturing PTC thermistors (POSISTOR).
The detection temperature depends on the board conditions, so please verify thoroughly before use.
| Thermoflagger™ Product name |
Murata Manufacturing POSISTOR product name |
Overheat detection temperature (Reference) |
|---|---|---|
TCTH021AE |
PRF18AR471QB5RB | 150ºC |
| PRF18BA471QB5RB | 140ºC | |
| PRF18BB471QB5RB | 130ºC | |
| PRF18BC471QB5RB | 120ºC | |
| PRF18BD471QB5RB | 110ºC | |
| PRF18BE471QB5RB | 100ºC | |
| PRF18BF471QB5RB | 90ºC | |
| PRF18BG471QB5RB | 80ºC | |
| PRF15BA102RB6RC | 136ºC | |
| PRF15BB102RB6RC | 126ºC | |
| PRF15BC102RB6RC | 116ºC | |
| PRF15BD102RB6RC | 106ºC | |
| PRF03BB541NB7RL | 135ºC | |
TCTH011AE |
PRF15BB103RB6RC | 122ºC |
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