74HC238; 74HCT238

3-to-8 line decoder/demultiplexer

The 74HC238; 74HCT238 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 and E2 and E3). Every output will be LOW 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 '238 ICs and one inverter. The '238 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.

Features and benefits

Wide supply voltage range from 2.0 to 6.0 V
CMOS low power dissipation
High noise immunity
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active HIGH mutually exclusive outputs
Input levels:
- For 74HC238: CMOS level
- For 74HCT238: TTL level
Complies with JEDEC standards
- JESD8C (2.7 V to 3.6 V)
- JESD7A (2.0 V to 6.0 V)
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
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	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
74HC238BQ	Production	2.0 - 6.0	CMOS	± 5.2	14	low	-40~125	94	14.4	63	DHVQFN16
74HC238D	Production	2.0 - 6.0	CMOS	± 5.2	14	low	-40~125	93	10.0	53	SO16
74HC238PW	Production	2.0 - 6.0	CMOS	± 5.2	14	low	-40~125	126	4.8	55.6	TSSOP16
74HCT238BQ	Production	4.5 - 5.5	TTL	± 4	18	low	-40~125	94	14.4	63	DHVQFN16
74HCT238D	Production	4.5 - 5.5	TTL	± 4	18	low	-40~125	93	10.0	53	SO16
74HCT238PW	Production	4.5 - 5.5	TTL	± 4	18	low	-40~125	126	4.8	55.6	TSSOP16

Package

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC238BQ	DHVQFN16 (SOT763-1)	SOT763-1		SOT763-1_115	Active	HC238	74HC238BQ,115 ( 9352 836 81115 )
74HC238D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HC238D	74HC238D,653 ( 9337 146 40653 )
74HC238PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	HC238	74HC238PW,118 ( 9351 890 00118 )
74HCT238BQ	DHVQFN16 (SOT763-1)	SOT763-1		SOT763-1_115	Active	HCT238	74HCT238BQ,115 ( 9352 836 82115 )
74HCT238D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HCT238D	74HCT238D,653 ( 9337 151 20653 )
74HCT238PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	HCT238	74HCT238PW,118 ( 9351 895 60118 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC238D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_652	Withdrawn / End-of-life	74HC238D	74HC238D,652 ( 9337 146 40652 )
74HC238PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_112	Withdrawn / End-of-life	HC238	74HC238PW,112 ( 9351 890 00112 )
74HCT238D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_652	Withdrawn / End-of-life	74HCT238D	74HCT238D,652 ( 9337 151 20652 )
74HCT238PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_112	Withdrawn / End-of-life	HCT238	74HCT238PW,112 ( 9351 895 60112 )

Discontinuation information

Type number	Orderable part number, (Ordering code (12NC))	Last time buy date	Last time delivery date	Replacement product
74HC238D	933714640652	2021-12-31	2022-06-30	74HC238D
74HC238PW	935189000112	2021-12-31	2022-06-30	74HC238PW
74HCT238D	933715120652	2021-12-31	2022-06-30	74HCT238D
74HCT238PW	935189560112	2021-12-31	2022-06-30	74HCT238PW

Environmental information

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC238BQ	74HC238BQ,115	74HC238BQ	Always Pb-free
74HC238D	74HC238D,653	74HC238D	week 12, 2005
74HC238PW	74HC238PW,118	74HC238PW	week 10, 2005
74HCT238BQ	74HCT238BQ,115	74HCT238BQ	Always Pb-free
74HCT238D	74HCT238D,653	74HCT238D	week 6, 2004
74HCT238PW	74HCT238PW,118	74HCT238PW	week 10, 2005

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC238D	74HC238D,652	74HC238D	week 12, 2005
74HC238PW	74HC238PW,112	74HC238PW	week 10, 2005
74HCT238D	74HCT238D,652	74HCT238D	week 6, 2004
74HCT238PW	74HCT238PW,112	74HCT238PW	week 10, 2005

Quality and reliability disclaimer

Documentation (10)

File name	Title	Type	Date
74HC_HCT238	3-to-8 line decoder/demultiplexer	Data sheet	2024-03-21
AN11044	Pin FMEA 74HC/74HCT family	Application note	2019-01-09
HCT_USER_GUIDE	HC/T User Guide	User manual	1997-10-31
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	Package information	2023-05-11
SO-SOJ-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SO-SOJ-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
WAVE_BG-BD-1	Wave soldering profile	Wave soldering	2021-09-08
SOT109-1	plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body	Package information	2023-11-07
SOT403-1	plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body	Package information	2023-11-08
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08

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