Hi Pololu Team,
I’m having an issue with a batch of the logic level shifters product # 2595. I have quantity 16 of these shifters, with the HV pins connected to a common 5V bus, and the LV pins connected to common a 3.3V bus. 7 of these shifters have a soft shorting resistance between the HV and LV of anywhere between 2 kohm to 16 kohm, whereas on the remaining 9, I measured the resistance between HV and LV to be ~1.6 Mohm. It seems like the short between the HV and LV is causing my 5V and 3.3V bus to short together, in this case, blowing a 1A fuse connected in series to my 5V power supply (just my current theory). This issue was repeated even without the Lx and Hx lines connected to anything.
Can you advise what is the nominal and appropriate resistance range between the HV and LV pins, and maximum allowable current?