74AHC138BQ PCB Symbol, Footprint & ECAD Model

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.

3-to-8 line decoder/demultiplexer; inverting

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Features

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 V_CC
For 74AHC138 only: operates with CMOS input levels
For 74AHCT138 only: operates with TTL input levels
ESD protection:
- HBM JESD22-A114E exceeds 2000 V
- MM JESD22-A115-A exceeds 200 V
- CDM JESD22-C101C exceeds 1000 V
Multiple package options
Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Target applications

Parametrics

Type number	Product status	V_CC (V)	Logic switching levels	Output drive capability (mA)	t_pd (ns)	Power dissipation considerations	T_amb (°C)	R_th(j-a) (K/W)	Ψ_th(j-top) (K/W)	R_th(j-c) (K/W)	Package name
74AHC138BQ	Production	2.0 - 5.5	CMOS	± 8	4.4	low	-40~125	93	13.8	62	DHVQFN16

Package

Type number	Orderable part number, (Ordering code (12NC))	Status	Marking	Package	Outline version	Reflow-/Wave soldering	Packing
74AHC138BQ	74AHC138BQ,115 ( 9352 855 72115 )	Active	AHC138	DHVQFN16 (SOT763-1)	SOT763-1		Reel 7" Q1/T1

Quality, reliability & chemical content

Type number	Orderable part number	Chemical content	RoHS / RHF	EFR	IFR	MTBF (hour)	MSL	MSL leadfree
74AHC138BQ	74AHC138BQ,115	74AHC138BQ		84.9	6.62	1.51E8	1	1

Quality and reliability disclaimer

Series

74AHC138; 74AHCT138 - 3-to-8 line decoder/demultiplexer; inverting

Documentation (5)

File name	Title	Type	Date
74AHC_AHCT138	3-to-8 line decoder/demultplexer; inverting	Data sheet	2017-04-07
AN11106	Pin FMEA for AHC/AHCT family	Application note	2019-01-09
ahc138	ahc138 IBIS model	IBIS model	2013-04-07
SOT763-1_115	DHVQFN16; Reel pack, SMD, 7" Q1/T1 standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115	Packing	2016-07-05
SOT763-1	plastic, leadless 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 1 mm body	Outline drawing	2018-11-14

Support

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Models

File name	Title	Type	Date
ahc138	ahc138 IBIS model	IBIS model	2013-04-07

Ordering, pricing & availability

Type number	Orderable part number	Ordering code (12NC)	Packing	Buy online
74AHC138BQ	74AHC138BQ,115	935285572115	Reel 7" Q1/T1	Order product

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