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.
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74AHC138BQ | 74AHC138BQ-G | 9352 855 72115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74AHC138BQ
| |
| 74AHC138D | 74AHC138D | 9352 629 99112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHC138D
| week 35, 2004 |
| 74AHC138D | 74AHC138D-T | 9352 629 99118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC138D
| week 35, 2004 |
| 74AHC138PW | 74AHC138PW | 9352 630 00112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHC138PW
| week 10, 2005 |
| 74AHC138PW | 74AHC138PW-T | 9352 630 00118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC138PW
| week 10, 2005 |
| 74AHCT138BQ | 74AHCT138BQ-G | 9352 855 73115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74AHCT138BQ
| |
| 74AHCT138D | 74AHCT138D | 9352 629 97112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHCT138D
| week 35, 2004 |
| 74AHCT138D | 74AHCT138D-T | 9352 629 97118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT138D
| week 35, 2004 |
| 74AHCT138PW | 74AHCT138PW | 9352 629 98112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHCT138PW
| week 10, 2005 |
| 74AHCT138PW | 74AHCT138PW-T | 9352 629 98118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT138PW
| week 10, 2005 |
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74AHC138BQ | 9352 855 72115 | Order samples | ||||||
| 74AHC138D | 9352 629 99112 | 0.1900 | NA | ARROW ELECTRONICS | 150 | 7/4/2008 | Buy online | not available |
| 74AHC138D | 9352 629 99118 | 0.1900 | NA | FUTURE ELECTRONICS | 26,500 | 7/4/2008 | Buy online | Order samples |
| 74AHC138PW | 9352 630 00112 | 0.1900 | not available | |||||
| 74AHC138PW | 9352 630 00118 | 0.1900 | NA | AVNET ELECTRONICS MARKETING | 55,000 | 7/4/2008 | Buy online | Order samples |
| NA | ARROW ELECTRONICS | 30,000 | 7/4/2008 | Buy online | ||||
| NA | FUTURE ELECTRONICS | 5,700 | 7/4/2008 | Buy online | ||||
| 74AHCT138BQ | 9352 855 73115 | Order samples | ||||||
| 74AHCT138D | 9352 629 97112 | 0.1900 | NA | AVNET ELECTRONICS MARKETING | 4,000 | 7/4/2008 | Buy online | not available |
| 74AHCT138D | 9352 629 97118 | 0.1900 | Order samples | |||||
| 74AHCT138PW | 9352 629 98112 | 0.1900 | NA | AVNET ELECTRONICS MARKETING | 7,200 | 7/4/2008 | Buy online | not available |
| 74AHCT138PW | 9352 629 98118 | 0.1900 | not available |
| Type number | Package | Description | Propagation Delay(ns) | Voltage | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|
| 74AHC138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 4.4@5V | 2.0-5.5 V | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHC138PW | SOT403-1
(TSSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 4.4@5V | 2.0-5.5 V | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHCT138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 4.4 | 4.5-5.5 V | Low Power | TTL | +/- 8 mA |
| 74AHCT138PW | SOT403-1
(TSSOP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled | 4.4 | 4.5-5.5 V | Low Power | TTL | +/- 8 mA |
74AHC138; 74AHCT138 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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