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TLV342: 動作不具合

KIMURA MASAYA
Prodigy 10 points
Part Number: TLV342

2021年6月に TLV342IRUGR をTI Store から11,950個購入しました。

①2,950個 LOT:未記録
②3,000個 LOT:1080507UT2
③3,000個 LOT:1080507UT2
④3,000個 LOT:1060340UT2

①②から36個の動作不具合品が出ています。
症状は「LEDが消えない」になります。
・良品とのクロスチェックで症状が逆転することより、部品に関連する不具合と判断しました。
・電気的症状はOP AMPの1OUTに電圧異常がみられました。下記表の通り電気を通していないのに出力されています。

④を1,500個使用しましたが不具合品は出ませんでした。
LOT:1080507UT2 に問題があると思われます。
・不具合現品の解析をお願いします。
・②③の未使用品 4,650個の交換をお願いします。

以上、よろしくお願いいたします。

  • 0
    TI__Mastermind 22361 points

    Masaya-san,

    If possible, could you please post this question or further responses in English? We can run this question through a translator but do not want to lose anything in translation.

    If the translator is correct though, the issue is the LED's are not turning off completely. If you have a voltage offset of up to 4mV and a gain of 100, you may see up to 400mV on the output of the op amp, which may explain why your op amp is not turning off completely.

    Best,
    Jerry

  • 0 in reply to Jerry Madalvanos
    Prodigy 10 points

    TLV342IRUGR ←Is the Input Offset Voltage of this model number 0.3 mV?

    Below is the data sheet.

    Because This circuit have a voltage offset of up to 3mV and a gain of 100, the output of the op amp see up to 300mV margin of error?

  • 0 in reply to KIMURA MASAYA
    TI__Mastermind 22361 points

    Masaya-san,

    The typical is 0.3mV, so you would see a 30mV output, however the max offset voltage for the non-A version of the part is 4mV (4.5mV over temperature)

    4.5mV *101 gain is going to be up to 454mV. This needs to be considered for your end application. To ensure this does not happen you would need to use a device with a lower max rating, or lower the gain of your circuit so it does not multiply the offset so much.

    Best,
    Jerry