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ISOTMP35-Q1: What should be taken great care when using isolated temperature sensor compared with using NTC on traction inverter applications?

Part Number: ISOTMP35-Q1
Other Parts Discussed in Thread: ISOTMP35

Dear team,

My customer used to use NTC for temperature sensing on IGBT device on traction inverters, What should be taken great care when using isolated temperature sensor compared with using NTC on traction inverter applications? 

  • And do we have reinforced isolation ISOTMP part? 

  • Zoe,

    The main advantage of ISOTMP35 is that it can directly connect to the IGBT devices. An NTC must be electrically isolated from the high voltage FETs, which requires distance from the heat source and hence poor response time and lower accuracy. One side of the ISOTMP35 is for high vbltage, and the other is for low voltage. So care must be taken to layout the placement of the IGBT devices so that the low voltage Vout signal from the ISOTMP35 remains electrically isolated from the HV side. Other than that, the ISOTMP35 HV side can directly connect to the IGBT for a much faster and more accurate temperature measurement.

    Are the IGBT devices a part of a separate packaged module, or does the customer have the freedom to have them directly connect to ISOTMP35?

    We do not have a reinforced ISOTMP part at this time, but it is being developed.

    -Alex Thompson