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Thermal Test Chip Instruments

The temperature sensing diodes built into TEA’s Thermal Test Chips(TTC) are designed for operation at a 1mA Measurement Current (IM). The current must be very stable and have low electrical noise. The current source voltage compliance has to be less than 2V to minimize potential damage to the diodes if the current polarity is mistakenly reversed.


The TMM-100 Temperature Measurement Module is a USB unit that has:

  • eight combination 1mA current source/voltage measurement channels
  • two 10KOhm Negative Temperature Coefficient Thermistor channels
  • two Type-T thermocouple channels

The supplied software allows the user to select which channels are read, set a 0.1s, 1s, or 10s time base, and data log to a file for up to 10,000 seconds. The software runs in WindowsTM XP, 7, 8 or 10.

LabViewTM Virtual Instrument (VI) drivers are optionally available for integration of the TMM-100 into more extensive test and measurement systems.

Further details can be found in the TMM-100 User Manual which can be downloaded by clicking here.

The 1mA Current Source Reference Design described in Tech Brief TB-18 is also available in an extended and assembled version as a hand-held unit shown on the right. This unit has a digital voltmeter display with 1mV resolution, a built-in 9V battery for completely isolated and portable operation, and is supplied with an external power supply for extended operation off the wall AC mains.

Phone: 650-961-5900
FAX: 650-227-3814
Santa Clara, CA, USA



1mA Current Source

TEA 1mA Current Source