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74HC138; 74HCT138
General description
The 74HC138; 74HCT138 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL).
The 74HC138; 74HCT138 decoder accepts three binary weighted address inputs (A0, A1 and A3) and when enabled, provides 8 mutually exclusive active LOW outputs (Y0 to Y7).
The 74HC138; 74HCT138 features 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 74HC138; 74HCT138 to a 1-of-32 (5 lines to 32 lines) decoder with just four 74HC138; 74HCT138 ICs and one inverter.
The 74HC138; 74HCT138 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. Not used enable inputs must be permanently tied to their appropriate active HIGH- or LOW-state.
The 74HC138; 74HCT138 is identical to the 74HC238; 74HCT238 but has inverting outputs.
Features
- Demultiplexing capability
- Multiple input enable for easy expansion
- Complies with JEDEC standard no. 7A
- Ideal for memory chip select decoding
- Active LOW mutually exclusive outputs
- ESD protection:
- HBM EIA/JESD22-A114-C exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel
Products/packages
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74HC138BQ | 74HC138BQ,115 | 9352 737 78115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74HC138BQ
| Always Pb-free |
| 74HC138D | 74HC138D,652 | 9337 134 00652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HC138D
| week 12, 2005 |
| 74HC138D | 74HC138D,653 | 9337 134 00653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HC138D
| week 12, 2005 |
| 74HC138DB | 74HC138DB,112 | 9351 744 10112 | Volume production | SOT338-1
(SSOP16) | Tube | Standard Marking | 74HC138DB
| week 12, 2005 |
| 74HC138DB | 74HC138DB,118 | 9351 744 10118 | Volume production | SOT338-1
(SSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HC138DB
| week 12, 2005 |
| 74HC138N | 74HC138N,652 | 9336 692 90652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HC138N
| Always Pb-free |
| 74HC138PW | 74HC138PW,112 | 9351 743 80112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74HC138PW
| week 10, 2005 |
| 74HC138PW | 74HC138PW,118 | 9351 743 80118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HC138PW
| week 10, 2005 |
| 74HC138U | 74HC138U,029 | 9338 243 20029 | Volume production | Uncased die | 74HC138U
| week 18, 2005 | ||
| 74HCT138BQ | 74HCT138BQ,115 | 9352 744 71115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74HCT138BQ
| Always Pb-free |
| 74HCT138D | 74HCT138D,652 | 9337 134 10652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HCT138D
| week 12, 2005 |
| 74HCT138D | 74HCT138D,653 | 9337 134 10653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HCT138D
| week 12, 2005 |
| 74HCT138DB | 74HCT138DB,112 | 9351 744 20112 | Volume production | SOT338-1
(SSOP16) | Tube | Standard Marking | 74HCT138DB
| week 12, 2005 |
| 74HCT138DB | 74HCT138DB,118 | 9351 744 20118 | Volume production | SOT338-1
(SSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HCT138DB
| week 12, 2005 |
| 74HCT138N | 74HCT138N,652 | 9336 699 20652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HCT138N
| Always Pb-free |
| 74HCT138PW | 74HCT138PW,112 | 9351 873 20112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74HCT138PW
| week 10, 2005 |
| 74HCT138PW | 74HCT138PW,118 | 9351 873 20118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HCT138PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HC138BQ | 9352 737 78115 | 74HC138BQ,115 | 0.2900 | NA | DIGI-KEY CORPORATION | 4,799 | 7/3/2009 | Buy online | Order samples | |
| 74HC138D | 9337 134 00652 | 74HC138D,652 | 0.1900 | EU | FARNELL | 2,450 | 7/3/2009 | Buy online | not available | |
| NA | DIGI-KEY CORPORATION | 1,677 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 5,029 | 7/4/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 50,949 | 7/3/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 4,321 | 7/2/2009 | Buy online | ||||||
| 74HC138D | 9337 134 00653 | 74HC138D,653 | 0.1900 | NA | NEWARK | 275 | 7/3/2009 | Buy online | Order samples | |
| NA | ARROW ELECTRONICS | 50,000 | 7/2/2009 | Buy online | ||||||
| ASIA | WPI | 7,500 | 2500 | 07/03/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 11,442 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 39 | 7/4/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 1,900 | 7/3/2009 | Buy online | ||||||
| 74HC138DB | 9351 744 10112 | 74HC138DB,112 | 0.1900 | not available | ||||||
| 74HC138DB | 9351 744 10118 | 74HC138DB,118 | 0.1900 | not available | ||||||
| 74HC138N | 9336 692 90652 | 74HC138N,652 | 0.1900 | NA | NEWARK | 1,243 | 7/3/2009 | Buy online | Order samples | |
| NA | ARROW ELECTRONICS | 10,827 | 7/2/2009 | Buy online | ||||||
| EU | FARNELL | 1,968 | 7/3/2009 | Buy online | ||||||
| ASIA | WPI | 250 | 25 | 07/03/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 1,457 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 2,595 | 7/4/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 22,705 | 7/3/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 7,156 | 7/2/2009 | Buy online | ||||||
| 74HC138PW | 9351 743 80112 | 74HC138PW,112 | 0.1900 | not available | ||||||
| 74HC138PW | 9351 743 80118 | 74HC138PW,118 | 0.1900 | ASIA | SAC - Taiwan | yes | 2500 | 07/04/2009 | Buy online | Order samples |
| NA | DIGI-KEY CORPORATION | 4,353 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 335 | 7/4/2009 | Buy online | ||||||
| 74HC138U | 9338 243 20029 | 74HC138U,029 | not available | |||||||
| 74HCT138BQ | 9352 744 71115 | 74HCT138BQ,115 | 0.3200 | not available | ||||||
| 74HCT138D | 9337 134 10652 | 74HCT138D,652 | 0.1900 | NA | NEWARK | 1,675 | 7/3/2009 | Buy online | not available | |
| NA | ARROW ELECTRONICS | 11,550 | 7/2/2009 | Buy online | ||||||
| EU | FARNELL | 1,934 | 7/3/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 7,560 | 7/3/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 16,946 | 7/2/2009 | Buy online | ||||||
| 74HCT138D | 9337 134 10653 | 74HCT138D,653 | 0.1900 | NA | ARROW ELECTRONICS | 20,000 | 7/2/2009 | Buy online | not available | |
| ASIA | WPI | 2,500 | 2500 | 07/03/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 5,788 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 2,100 | 7/4/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 2,400 | 7/3/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 5,000 | 7/2/2009 | Buy online | ||||||
| 74HCT138DB | 9351 744 20112 | 74HCT138DB,112 | 0.2400 | Order samples | ||||||
| 74HCT138DB | 9351 744 20118 | 74HCT138DB,118 | 0.2400 | not available | ||||||
| 74HCT138N | 9336 699 20652 | 74HCT138N,652 | 0.1900 | NA | NEWARK | 1,154 | 7/3/2009 | Buy online | Order samples | |
| NA | ARROW ELECTRONICS | 3,826 | 7/2/2009 | Buy online | ||||||
| EU | FARNELL | 1,241 | 7/3/2009 | Buy online | ||||||
| ASIA | WPI | 75 | 25 | 07/03/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 271 | 7/3/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 588 | 7/4/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 2,306 | 7/3/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 6,490 | 7/2/2009 | Buy online | ||||||
| 74HCT138PW | 9351 873 20112 | 74HCT138PW,112 | 0.1900 | Order samples | ||||||
| 74HCT138PW | 9351 873 20118 | 74HCT138PW,118 | 0.1900 | ASIA | SAC - Taiwan | yes | 2500 | 07/04/2009 | Buy online | not available |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74HC138BQ | SOT763-1
(DHVQFN16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 12@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 12@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC138DB | SOT338-1
(SSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 12@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC138N | SOT38-4
(DIP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 12@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC138PW | SOT403-1
(TSSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 12@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC138U | Uncased die
| 3-to-8 Line Decoder/Demultiplexer; Inverting | 15 | 5 Volts + | 16 | Low Power or Battery Applications | CMOS | Low |
| 74HCT138BQ | SOT763-1
(DHVQFN16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 17 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 4 mA |
| 74HCT138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 17 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 4 mA |
| 74HCT138DB | SOT338-1
(SSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 17 | 4.5-5.5V | 16 | Low Power | TTL | +/- 4 mA |
| 74HCT138N | SOT38-4
(DIP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 17 | 4.5-5.5V | 16 | Low Power | TTL | +/- 4 mA |
| 74HCT138PW | SOT403-1
(TSSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 17 | 4.5-5.5V | 16 | Low Power | TTL | +/- 4 mA |
Similar products
74HC138; 74HCT138
links to the similar products page containing an overview of products that are similar in
function or related to the type number(s) as listed on this page.
The similar products page includes products from the same catalog tree(s),
relevant selection guides and products from the same functional category.
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