74HC138; 74HCT138
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 VCC.
Features and benefits
Wide supply voltage range from 2.0 to 6.0 V
CMOS low power dissipation
High noise immunity
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active LOW mutually exclusive outputs
Input levels:
For 74HC138: CMOS level
For 74HCT138: TTL level
Complies with JEDEC standards:
JESD8C (2.7 V to 3.6 V)
JESD7A (2.0 V to 6.0 V)
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 | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Package name |
|---|---|---|---|---|---|---|---|
| 74HC138BQ | 2.0 - 6.0 | CMOS | ± 5.2 | 12 | low | -40~125 | DHVQFN16 |
| 74HC138D | 2.0 - 6.0 | CMOS | ± 5.2 | 12 | low | -40~125 | SO16 |
| 74HC138PW | 2.0 - 6.0 | CMOS | ± 5.2 | 12 | low | -40~125 | TSSOP16 |
| 74HCT138BQ | 4.5 - 5.5 | TTL | ± 4 | 19 | low | -40~125 | DHVQFN16 |
| 74HCT138D | 4.5 - 5.5 | TTL | ± 4 | 19 | low | -40~125 | SO16 |
| 74HCT138PW | 4.5 - 5.5 | TTL | ± 4 | 19 | low | -40~125 | TSSOP16 |
Package
| Type number | Orderable part number, (Ordering code (12NC)) | Status | Marking | Package | Package information | Reflow-/Wave soldering | Packing |
|---|---|---|---|---|---|---|---|
| 74HC138BQ | 74HC138BQ,115 (935273778115) |
Active | HC138 |
DHVQFN16 (SOT763-1) |
SOT763-1 | SOT763-1_115 | |
| 74HC138D | 74HC138D,653 (933713400653) |
Active | 74HC138D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
Not available |
| 74HC138PW | 74HC138PW,118 (935174380118) |
Active | HC138 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
SOT403-1_118 |
| 74HCT138BQ | 74HCT138BQ,115 (935274471115) |
Active | HCT138 |
DHVQFN16 (SOT763-1) |
SOT763-1 | SOT763-1_115 | |
| 74HCT138D | 74HCT138D,653 (933713410653) |
Active | 74HCT138D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
Not available |
| 74HCT138PW | 74HCT138PW,118 (935187320118) |
Active | HCT138 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
SOT403-1_118 |
All type numbers in the table below are discontinued.
| Type number | Orderable part number, (Ordering code (12NC)) | Status | Marking | Package | Package information | Reflow-/Wave soldering | Packing |
|---|---|---|---|---|---|---|---|
| 74HC138D | 74HC138D,652 (933713400652) |
Withdrawn / End-of-life | 74HC138D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
SOT109-1_652 |
| 74HC138DB | 74HC138DB,112 (935174410112) |
Obsolete | HC138 |
SSOP16 (SOT338-1) |
SOT338-1 |
SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE |
Not available |
| 74HC138DB,118 (935174410118) |
Withdrawn / End-of-life | HC138 | Not available | ||||
| 74HC138PW | 74HC138PW,112 (935174380112) |
Withdrawn / End-of-life | HC138 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
Not available |
| 74HCT138D | 74HCT138D,652 (933713410652) |
Withdrawn / End-of-life | 74HCT138D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
SOT109-1_652 |
| 74HCT138PW | 74HCT138PW,112 (935187320112) |
Withdrawn / End-of-life | HCT138 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
Not available |
Environmental information
| Type number | Orderable part number | Chemical content | RoHS | RHF-indicator |
|---|---|---|---|---|
| 74HC138BQ | 74HC138BQ,115 | 74HC138BQ |
|
|
| 74HC138D | 74HC138D,653 | 74HC138D |
|
|
| 74HC138PW | 74HC138PW,118 | 74HC138PW |
|
|
| 74HCT138BQ | 74HCT138BQ,115 | 74HCT138BQ |
|
|
| 74HCT138D | 74HCT138D,653 | 74HCT138D |
|
|
| 74HCT138PW | 74HCT138PW,118 | 74HCT138PW |
|
|
All type numbers in the table below are discontinued.
| Type number | Orderable part number | Chemical content | RoHS | RHF-indicator |
|---|---|---|---|---|
| 74HC138D | 74HC138D,652 | 74HC138D |
|
|
| 74HC138DB | 74HC138DB,112 | 74HC138DB |
|
|
| 74HC138DB | 74HC138DB,118 | 74HC138DB |
|
|
| 74HC138PW | 74HC138PW,112 | 74HC138PW |
|
|
| 74HCT138D | 74HCT138D,652 | 74HCT138D |
|
|
| 74HCT138PW | 74HCT138PW,112 | 74HCT138PW |
|
|
Documentation (22)
| File name | Title | Type | Date |
|---|---|---|---|
| 74HC_HCT138 | 3-to-8 line decoder/demultiplexer; inverting | Data sheet | 2024-02-26 |
| AN11044 | Pin FMEA 74HC/74HCT family | Application note | 2019-01-09 |
| 001aae059 | Block diagram: 74HC138BQ, 74HC138D, 74HC138DB, 74HC138N, 74HC138PW, 74HC138U, 74HCT138BQ, 74HCT138D, 74HCT138DB, 74HCT138N, 74HCT138PW | Block diagram | 2009-11-03 |
| SOT763-1 | 3D model for products with SOT763-1 package | Design support | 2019-10-03 |
| SOT109-1 | 3D model for products with SOT109-1 package | Design support | 2020-01-22 |
| SOT403-1 | 3D model for products with SOT403-1 package | Design support | 2020-01-22 |
| 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 |
| SO16_SOT109-1_mk | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm body | Marcom graphics | 2017-01-28 |
| SSOP16_SOT338-1_mk | plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm body | Marcom graphics | 2017-01-28 |
| TSSOP16_SOT403-1_mk | plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body | Marcom graphics | 2017-01-28 |
| 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 |
| 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 |
| SOT338-1 | plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm body | Package information | 2022-06-20 |
| 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 |
| SO-SOJ-REFLOW | Footprint for reflow soldering | Reflow soldering | 2009-10-08 |
| SSOP-TSSOP-VSO-REFLOW | Footprint for reflow soldering | Reflow soldering | 2009-10-08 |
| hc | HC/HCT Spice model | SPICE model | 2022-02-17 |
| HCT_USER_GUIDE | HC/T User Guide | User manual | 1997-10-31 |
| SO-SOJ-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
| WAVE_BG-BD-1 | Wave soldering profile | Wave soldering | 2021-09-08 |
| SSOP-TSSOP-VSO-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
Support
If you are in need of design/technical support, let us know and fill in the answer form we'll get back to you shortly.
Models
| File name | Title | Type | Date |
|---|---|---|---|
| SOT763-1 | 3D model for products with SOT763-1 package | Design support | 2019-10-03 |
| SOT109-1 | 3D model for products with SOT109-1 package | Design support | 2020-01-22 |
| SOT403-1 | 3D model for products with SOT403-1 package | Design support | 2020-01-22 |
| hc | HC/HCT Spice model | SPICE model | 2022-02-17 |
Ordering, pricing & availability
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