Select site:
- English
74AHC138; 74AHCT138
General description
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.
Features
- Balanced propagation delays
- All inputs have Schmitt-trigger action
- Demultiplexing capability
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- Inputs accepts voltages higher than VCC
- For 74AHC138 only: operates with CMOS input levels
- For 74AHCT138 only: operates with TTL input levels
- ESD protection:
- HBM JESD22-A114E exceeds 2000 V
- MM JESD22-A115-A exceeds 200 V
- CDM JESD22-C101C exceeds 1000 V
- Multiple package options
- Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel
Products/packages
| 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 |
Pricing/ordering/availability
| 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 |
Parametrics/similar products
| 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 |
Similar products
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.
Disclaimer
The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.
The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.
As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.
- http://www.philips.semiconductors.com use http://www.nxp.com
- http://www.semiconductors.philips.com use http://www.nxp.com (Internet)
- sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)
The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-
If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.