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SN74AHCT138Q-Q1: SN74AHCT138Q-Q1

Part Number: SN74AHCT138Q-Q1
Other Parts Discussed in Thread: SN74HCS138-Q1


I am using SN74AHCT138QDRQ1 (3*8 line demux) for one of my application. In that absolute max rating Vcc showing -0.5V to 7V and recommended operating condition Vcc is 4.5V to 5.5V only. I have designed my power supply with 3.6Vdc output. So I want to operate it on 3.6Vcc.

Kindly share the adverse effect (in terms of reliability etc) if any. 


Munesh Tripathi

  • The "T" indicates a device with TTL-compatible inputs, and TTL runs only at 5 V.

    When you go outside the recommended operating conditions, neither the electrical characteristics nor correct operation are guaranteed. Use the SN74HCS138-Q1 instead.