Toshiba Expands Line-up of Thermoflagger
Toshiba has expanded its line-up of “TCTH0xxxE
series” Thermoflagger over-temperature detection ICs that can be
used in a simple circuit with positive temperature coefficient (PTC)
thermistors to detect temperature rises in electronic equipment. Shipments of
the six new products start today.
For electronic equipment to perform as specified,
semiconductors and other electronic components must operate within design
parameters. Internal temperature is a crucial parameter, especially if it
becomes higher than that assumed during the design process; it can be a major
safety and reliability problem, and an overheating monitoring solution is
needed to detect any rise in temperature.
Thermoflagger over-temperature detection ICs detect
temperature rises when configured in a simple circuit with PTC thermistors,
whose resistance value changes with the temperature. The ICs also detect
changes in the resistance of PTC thermistors placed near heat sources, and
output a FLAG signal in case of over-temperature. When a Thermoflagger™ detects
abnormal heat generation and sends a FLAG to an MCU, for example, the MCU will
shut down the equipment or change the operation of the equipment or
semiconductor that is generating heat. Connecting PTC thermistors in series
realizes over-temperature detection for multiple locations.
The six new products are TCTH011AE, TCTH012AE, TCTH021AE, TCTH022AE, TCTH011BE and TCTH012BE. These join the already released TCTH021BE and TCTH022BE and bring the TCTH0xxxE series line-up to eight products. The new products expand the range of PTC thermistors that can be selected by supporting two types of PTCO output current[1]. Push-pull or open-drain FLAG signal output types can be selected, as can the use or non-use of a FLAG signal latch function. Extending the range of product selections enables flexible circuit designs with low current consumption.
The new products are packaged in a small,
industry-standard SOT-553 (Toshiba’s package name: ESV), ensuring that the
TCTH0xxxE series supports easy configuration of over-temperature detection for
complete sets of electronic equipment, and helps to reduce size and power
consumption.
Alongside an already published reference design,
the Thermoflagger Over-temperature Detection IC Application Circuit
(TCTH021BE/Open Drain version), Toshiba has made a new reference
design available on its website today: the Thermoflagger™ Over-temperature Detection IC Application Circuit
(TCTH021AE/Push-Pull version).
Toshiba uses technical information from Murata
Manufacturing Co., Ltd. regarding PTC thermistors for the over-temperature
detect solution. Murata recommends Thermoflagger™ for use with PTC thermistors.
Murata's List of Recommended ICs
Murata's PTC thermistors
Toshiba will continue to expand its product line-up
with various packages and improved device characteristics that contribute to
design flexibility and carbon neutrality.
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