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74HC138BQ

3-to-8 line decoder/demultiplexer; inverting

Nexperia B.V. All rights reserved 

74HC138; 74HCT138

3-to-8 line decoder/demultiplexer; inverting

Rev. 8 — 7 April 2020

Product data sheet

1. General description

The 74HC138; 74HCT138 decodes three binary weighted address inputs (A0, A1 and A2) to

eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1, E2 and

E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable

function allows easy parallel expansion to a 1-of-32 (5 to 32 lines) decoder with just four '138 ICs

and one inverter. The '138 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. Inputs include

clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in

excess of VCC.

2. Features and benefits

• Complies with JEDEC standard no. 7A

• Input levels:

• For 74HC138: CMOS level

• For 74HCT138: TTL level

• Demultiplexing capability

• Multiple input enable for easy expansion

• Ideal for memory chip select decoding

• Active LOW mutually exclusive outputs

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• Multiple package options

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

3. Ordering information

Table 1. Ordering information

Type number

Package

Temperature range Name

Description

74HC138D

74HCT138D

-40 °C to +125 °C SO16

plastic small outline package; 16 leads;

body width 3.9 mm

74HC138DB

74HCT138DB

-40 °C to +125 °C

SSOP16

plastic shrink small outline package; 16 leads;

body width 5.3 mm

74HC138PW

74HCT138PW

-40 °C to +125 °C

TSSOP16 plastic thin shrink small outline package; 16 leads;

body width 4.4 mm

74HC138BQ

74HCT138BQ

-40 °C to +125 °C

DHVQFN16 plastic dual in-line compatible thermal enhanced

very thin quad flat package; no leads; 16 terminals;

body 2.5 × 3.5 × 0.85 mm

Version

SOT109-1

SOT338-1

SOT403-1

SOT763-1

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