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74AHCT138BQ

3-to-8 line decoder/demultiplexer; inverting

The 74AHC138; 74AHCT138 are high-speed Si-gate CMOS devices and are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard No. 7A.

The 74AHC138; 74AHCT138 is a 3-to-8 line decoder/demultiplexer. It accepts three binary weighted address inputs (A0, A1 and A2) and, when enabled, provides eight mutually exclusive outputs (Y0 to Y7) that are LOW when selected.

There are three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH.

This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four 74AHC138; 74AHCT138 devices and one inverter. The 74AHC138; 74AHCT138 can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state.

Features and benefits

  • Balanced propagation delays

  • All inputs have Schmitt-trigger action

  • Demultiplexing capability

  • Multiple input enable for easy expansion

  • Ideal for memory chip select decoding

  • Inputs accepts voltages higher than VCC

  • For 74AHC138 only: operates with CMOS input levels

  • For 74AHCT138 only: operates with TTL input levels

  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V

  • Multiple package options

  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Parametrics

Type number Product status VCC (V) Logic switching levels Output drive capability (mA) tpd (ns) Power dissipation considerations Tamb (°C) Rth(j-a) (K/W) Ψth(j-top) (K/W) Rth(j-c) (K/W) Package name
74AHCT138BQ Production 4.5 - 5.5 TTL ± 8 4.4 low -40~125 93 13.8 62 DHVQFN16

PCB Symbol, Footprint and 3D Model

Model Name Description

Package

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
74AHCT138BQ 74AHCT138BQ,115
(935285573115)
Active AHT138 SOT763-1
DHVQFN16
(SOT763-1)
SOT763-1 SOT763-1_115

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
74AHCT138BQ 74AHCT138BQ,115 74AHCT138BQ rohs rhf rhf
Quality and reliability disclaimer

Documentation (10)

File name Title Type Date
74AHC_AHCT138 3-to-8 line decoder/demultiplexer; inverting Data sheet 2024-02-29
AN11106 Pin FMEA for AHC/AHCT family Application note 2019-01-09
SOT763-1 3D model for products with SOT763-1 package Design support 2019-10-03
ahct138 ahct138 IBIS model IBIS model 2013-04-07
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
DHVQFN16_SOT763-1_mk plastic, dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 0.85 mm body Marcom graphics 2017-01-28
SOT763-1_115 DHVQFN16; Reel pack, SMD, 7" Q1/T1 product orientation Packing information 2020-04-21
74AHCT138BQ_Nexperia_Product_Reliability 74AHCT138BQ Nexperia Product Reliability Quality document 2023-05-29

Support

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Models

File name Title Type Date
ahct138 ahct138 IBIS model IBIS model 2013-04-07
SOT763-1 3D model for products with SOT763-1 package Design support 2019-10-03

PCB Symbol, Footprint and 3D Model

Model Name Description

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
74AHCT138BQ 74AHCT138BQ,115 935285573115 Active SOT763-1_115 3,000 Order product

Sample

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How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74AHCT138BQ 74AHCT138BQ,115 935285573115 SOT763-1 Order product