74HCT138BQ

3-to-8 line decoder/demultiplexer; inverting

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 V_CC.

3-to-8 line decoder/demultiplexer; inverting

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Features

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

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
74HCT138BQ	Production	4.5 - 5.5	TTL	± 4	19	low	-40~125	93	14.3	63	DHVQFN16

Package

Type number	Orderable part number, (Ordering code (12NC))	Status	Marking	Package	Outline version	Reflow-/Wave soldering	Packing
74HCT138BQ	74HCT138BQ,115 ( 9352 744 71115 )	Active	HCT138	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
74HCT138BQ	74HCT138BQ,115	74HCT138BQ		84.9	6.62	1.51E8	1	1

Quality and reliability disclaimer

Series

74HC(T)138 - 3-to-8 line decoder/demultiplexer; inverting

Documentation (6)

File name	Title	Type	Date
74HC_HCT138	3-to-8 line decoder/demultiplexer; inverting	Data sheet	2018-03-26
AN11044	Pin FMEA 74HC/74HCT family	Application note	2019-01-09
hc	hc Spice model	SPICE model	2013-05-06
HCT_USER_GUIDE	HC/T User Guide	User manual	1997-10-31
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

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Models

File name	Title	Type	Date
hc	hc Spice model	SPICE model	2013-05-06

Ordering, pricing & availability

Type number	Orderable part number	Ordering code (12NC)	Packing	Buy online
74HCT138BQ	74HCT138BQ,115	935274471115	Reel 7" Q1/T1	Order product

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