Product details

Technology family HC Number of channels 1 Operating temperature range (°C) -40 to 85 Rating Catalog Supply current (max) (µA) 80
Technology family HC Number of channels 1 Operating temperature range (°C) -40 to 85 Rating Catalog Supply current (max) (µA) 80
SSOP (DB) 16 48.36 mm² (6.2 mm × 7.8 mm) SOIC (D) 16 59.4 mm² (9.9 mm × 6 mm) TSSOP (PW) 16 32 mm² (5 mm × 6.4 mm) PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm) SOP (NS) 16 79.56 mm² (10.2 mm × 7.8 mm)
  • Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Wide Operating Voltage Range (2 V to 6 V)
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 15 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1-µA Maximum
  • Active Low Outputs ( Selected Output is Low)
  • Incorporate Three Enable Inputs to Simplify Cascading or Data Reception
  • Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Wide Operating Voltage Range (2 V to 6 V)
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 15 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1-µA Maximum
  • Active Low Outputs ( Selected Output is Low)
  • Incorporate Three Enable Inputs to Simplify Cascading or Data Reception

The SNx4HC138 devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories using a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

The SNx4HC138 devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories using a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

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SN74AHC138 ACTIVE 2V-to-5.5V 3-line to 8-line decoder and demultiplexer Voltage range 2V to 5.5V, average propagation delay 12ns, average drive strength 9mA

Technical documentation

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Top documentation Type Title Format options Date
* Data sheet SNx4HC138 3-Line To 8-Line Decoders/Demultiplexers datasheet (Rev. G) PDF | HTML Oct 8, 2021
Application brief Using Linear Interpolation to Estimate Specification Values PDF | HTML Apr 13, 2026

Design & development

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Evaluation board

14-24-LOGIC-EVM — Logic product generic evaluation module for 14-pin to 24-pin D, DB, DGV, DW, DYY, NS and PW packages

The 14-24-LOGIC-EVM evaluation module (EVM) is designed to support any logic device that is in a 14-pin to 24-pin D, DW, DB, NS, PW, DYY or DGV package,

User guide: PDF | HTML
Supported products & hardware
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Package Pins CAD symbols, footprints & 3D models
SSOP (DB) 16 Ultra Librarian
SOIC (D) 16 Ultra Librarian
TSSOP (PW) 16 Ultra Librarian
PDIP (N) 16 Ultra Librarian
SOP (NS) 16 Ultra Librarian

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