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ISOTMP35-Q1

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Automotive 1.5°C basic isolated temperature sensor with 10mV/°C analog output

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Data sheet

ISOTMP35-Q1

ACTIVE
Data sheet Order now

Product details

Isolation rating Basic Withstand isolation voltage (VISO) (Vrms) 3000 Transient isolation voltage (VIOTM) (VPK) 4250 Surge isolation voltage (VIOSM) (VPK) 6500 Creepage (min) (mm) 4 Clearance (min) (mm) 4 Interface type Analog output Integrated isolated power Yes Local sensor accuracy (max) 1.5 Sensor gain (mV/°C) 10 Supply current (max) (µA) 12 Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 5.5 Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable
Isolation rating Basic Withstand isolation voltage (VISO) (Vrms) 3000 Transient isolation voltage (VIOTM) (VPK) 4250 Surge isolation voltage (VIOSM) (VPK) 6500 Creepage (min) (mm) 4 Clearance (min) (mm) 4 Interface type Analog output Integrated isolated power Yes Local sensor accuracy (max) 1.5 Sensor gain (mV/°C) 10 Supply current (max) (µA) 12 Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 5.5 Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable
SOIC (DFQ) 7 29.4 mm² 4.9 x 6

  • AEC-Q100 qualified with:

    • Temperature grade 0: –40°C to 150°C Ambient Operating Temperature Range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C5
  • Functional Safety-Capable
    • – Documentation available to aid functional safety system design
  • Robust integrated isolation barrier:
    • Withstand isolation voltage: 3000VRMS
    • Isolation working voltage: 500VRMS
  • Isolation barrier life: > 50 years
  • Temperature sensor accuracy
    • ±0.5°C typical at 25°C
    • ±1.5°C maximum from 0°C to 70°C
    • ±2.0°C maximum from –40°C to 150°C
  • Operating supply range: 2.3V to 5.5V
  • Positive slope sensor gain: 10mV/°C, with 500mV offset at 0°C
  • Fast thermal response: < 2 seconds
  • Short circuit protected output
  • Low power consumption: 9µA (typical)
  • DFQ (SOIC-7) package
  • Safety-related certifications (planned):
    • 3kVRMS isolation for 1 minute per UL 1577

  • AEC-Q100 qualified with:

    • Temperature grade 0: –40°C to 150°C Ambient Operating Temperature Range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C5
  • Functional Safety-Capable
    • – Documentation available to aid functional safety system design
  • Robust integrated isolation barrier:
    • Withstand isolation voltage: 3000VRMS
    • Isolation working voltage: 500VRMS
  • Isolation barrier life: > 50 years
  • Temperature sensor accuracy
    • ±0.5°C typical at 25°C
    • ±1.5°C maximum from 0°C to 70°C
    • ±2.0°C maximum from –40°C to 150°C
  • Operating supply range: 2.3V to 5.5V
  • Positive slope sensor gain: 10mV/°C, with 500mV offset at 0°C
  • Fast thermal response: < 2 seconds
  • Short circuit protected output
  • Low power consumption: 9µA (typical)
  • DFQ (SOIC-7) package
  • Safety-related certifications (planned):
    • 3kVRMS isolation for 1 minute per UL 1577

The ISOTMP35-Q1 is the industry’s first isolated temperature sensor IC, combining an integrated isolation barrier, up to 3000VRMS withstand voltage, with an analog temperature sensor featuring a 10mV/°C slope from –40°C to 150°C. This integration enables the sensor to be co-located with high voltage heat sources (for example: HV FETs, IGBTs, or HV contactors) without requiring expensive isolation circuitry. The direct contact with the high-voltage heat source also provides greater accuracy and faster thermal response compared with approaches where the sensor is placed further away to meet isolation requirements.

Operating from a non-isolated 2.3V to 5.5V supply, the ISOTMP35-Q1 allows easy integration into applications where sub-regulated power is not available on the high-voltage plane.

The integrated isolation barrier satisfies UL 1577 requirements. The surface mount package (7-pin SOIC) provides excellent heat flow from the heat source to the embedded thermal sensor, minimizing thermal mass and providing more accurate heat-source measurement. This reduces the need for time-consuming thermal modeling and improves system design margin by reducing mechanical variations due to manufacturing and assembly.

The ISOTMP35-Q1 class-AB output driver provides a strong 500µA maximum output to drive capacitive loads up to 1000pF and is designed to directly interface with analog-to-digital converter (ADC) sample and hold inputs.

The ISOTMP35-Q1 is the industry’s first isolated temperature sensor IC, combining an integrated isolation barrier, up to 3000VRMS withstand voltage, with an analog temperature sensor featuring a 10mV/°C slope from –40°C to 150°C. This integration enables the sensor to be co-located with high voltage heat sources (for example: HV FETs, IGBTs, or HV contactors) without requiring expensive isolation circuitry. The direct contact with the high-voltage heat source also provides greater accuracy and faster thermal response compared with approaches where the sensor is placed further away to meet isolation requirements.

Operating from a non-isolated 2.3V to 5.5V supply, the ISOTMP35-Q1 allows easy integration into applications where sub-regulated power is not available on the high-voltage plane.

The integrated isolation barrier satisfies UL 1577 requirements. The surface mount package (7-pin SOIC) provides excellent heat flow from the heat source to the embedded thermal sensor, minimizing thermal mass and providing more accurate heat-source measurement. This reduces the need for time-consuming thermal modeling and improves system design margin by reducing mechanical variations due to manufacturing and assembly.

The ISOTMP35-Q1 class-AB output driver provides a strong 500µA maximum output to drive capacitive loads up to 1000pF and is designed to directly interface with analog-to-digital converter (ADC) sample and hold inputs.
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Technical documentation

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Type Title Date
* Data sheet ISOTMP35-Q1 Automotive ±1.5°C , 3-kVRMS Isolated Temperature Sensor With Analog Output With < 2 Seconds Response Time and 500VRMS Working Voltage datasheet (Rev. A) PDF | HTML 07 Jun 2024
Circuit design Circuit for driving an ADC with an instrumentation amplifier in high gain (Rev. A) PDF | HTML 24 Sep 2024
Circuit design Driving a SAR ADC directly without a front-end buffer circuit (Rev. B) PDF | HTML 23 Sep 2024
Functional safety information ISOTMP35-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 11 Jun 2024
EVM User's guide ISOTMP35B Evaluation Module User's Guide PDF | HTML 29 Aug 2023

Design & development

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Evaluation board

ISOTMP35BEVM — ISOTMP35 evaluation module

The ISOTMP35BEVM evaluation module (EVM) enables designers to evaluate the performance of ISOTMP35 analog isolated temperature sensor, using a USB interface and onboard MSP430F5528 microcontroller (MCU) for control and data logging. The sensor may be separated from the main board, which allows for (...)
User guide: PDF | HTML
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SOIC (DFQ) 7 Ultra Librarian
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