Abnormal problem
1. When using SN74HC04DR abnormal lot number LTC#: 15C9QPK, 15C9QKK, the RF Switch cannot be driven at the applied voltage of 4.95V (cannot be switched)
2. Replace the LTC# with the following lot number: OBATXSK/OBATXSK/9CA5HSK/9CA5HTK and all are PASS
3. It is also found that abnormal materials (LTC#: 15C9QPK, 15C9QKK) have a rising trend in resistance value with pressure drop
This material has been produced many times, why only these 2 batch numbers are abnormal? Please tell me how to find out the cause of the abnormality? We can provide test data, please provide FAE mailbox