The 74hc138 IC is a high-speed CMOS device. The device accepts a three bit binary weighted address on input pins A0, A1 and A2 and when enabled will produce one active low output with the remaing seven being high. There are two active LOW enable inputs E1 and E2, and one active HIGH enable input E3. The disabled device state results in all outputs being high. The enable state occurs with E1 and E2 asserted low and E3 asserted high. The multiple enable lines allow for the parallel expansion of decoders to create 4-to-16 line versions with no additional parts and 5-to-32 versions with the addition of a single inverter.

Features of 74hc138 IC:

  • Wide Supply Voltage Range from 2.0V to 6.0V
  • Sinks or sources 8 mA at VCC = 4.5V
  • CMOS low power consumption
  • Schmitt Trigger Action at All Inputs
  • Inputs Accept up to 6.0V
  • Exceeds 200-V Machine Model (A115-A)
  • ESD Protection Tested per JESD 22
  • Exceeds 2000-V Human Body Model (A114-A)
  • Exceeds 1000-V Charged-Device Model (C101C)
  • Latch-Up Exceeds 100mA per JESD 78D, Class II


  • Memory chip select decoding
  • Demultiplexing
  • Single line peripheral control
  • Allow simple serial bitstreams from a microcontroller to control as many peripheral lines as needed


Package Includes:

1 x 74hc138 IC

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Additional information

Weight 0.1 kg


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