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LM35: LM35CAZ/NOPB

Trevor Shiels
Prodigy 10 points
Part Number: LM35

As a business we manufacture temperature sensors, one product we provide consists of an LM35CAZ/NOPB element with 3 x 1.000mtr 7/02 flexible silver plated copper leads,

a customer has reported that 10 pieces have failed (see below)

Sensors were rejected due to

  • Consistently reading 150°C
  • Intermittently reading 150°C
  • Reading random temperatures.

 One fail reported in January 2017.

 Nine fails reported between June & September 2017.

 We tested 3 x Temperature Sensors.

 3 of the sensors were verified as failing during retest.

Notes attached contain details of findings - Sensor reported temperature values at ambient environment eg. Sensor # 1 read 24.1°C, Sensor # 2 read 23.7°C etc.

Return

  • Sensor # 3 (150°C), 5 (random) and 8 (150°C) were deemed as defective

Does anybody know of a test proceder we could adopt to confirm the finished units are working correctly, please note we manufacture 1,000 per despatch so test would need to be speedy.

 

  • 0
    TI__Expert 7355 points
    Trevor,

    Let me ask our test team.

    -Kelvin
  • 0
    TI__Expert 7355 points

    Trevor,

    What is your current test procedure for your end product? How long has your end product been in production?
    Is this problem isolated for just this one customer?
    Have you used LM35 before in other designs and were there issues?

    After the validation, the production test typically includes measuring the output at room temperature.
     
    -Kelvin