SN74AHCT138N Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments SN74AHCT138N is a 3-to-8 line inverting decoder and demultiplexer operating from a 4.5V to 5.5V supply. It features 3 enable inputs for cascading and output enable control, with a 50 pF load capacitance rating. Packaged in a 16-pin PDIP for easy through-hole assembly in address decoding and bus expansion designs.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74AHCT138N Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3563(MOQ 25)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74AHCT138N?
- 3-to-8 line inverting decoder / demultiplexer logic function
- Supply voltage range: 4.5V to 5.5V (AHCT family)
- 3 enable inputs for cascading and chip-select control
- Maximum output low current: 8 mA per output pin
- 50 pF load capacitance rating for standard bus loads
- 16-pin PDIP through-hole package for breadboard and prototype use
What is SN74AHCT138N used for?
SN74AHCT138N is widely used in address decoding circuits for microprocessor memory maps, enabling 8 independently selectable outputs from 3 binary address lines. It also serves in demultiplexing applications, bus expansion, and peripheral chip-select generation in embedded and digital logic systems operating at 5V.
What are the specifications of SN74AHCT138N?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | 3 ENABLE INPUTS |
| Family | AHCT/VHCT/VT |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 3-LINE TO 8-LINE DECODER |
| Max I(ol) | 0.008A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 12ns |
| Propagation Delay (tpd) | 13ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Where can I find the SN74AHCT138N datasheet?
SN74AHCT138N Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHCT138N?
Compatible alternatives and drop-in replacements for SN74AHCT138N:
Frequently Asked Questions
How many outputs does SN74AHCT138N drive, and what logic level does each output assert when selected?
SN74AHCT138N drives 8 outputs in a 3-to-8 inverting configuration, asserting each selected output LOW (active-low) while the remaining 7 outputs stay HIGH. The maximum output low current is 8 mA at 4.5V to 5.5V supply.
For a 5V microcontroller address bus, how does SN74AHCT138N compare to a 74HC138 in terms of supply compatibility?
SN74AHCT138N operates from 4.5V to 5.5V and accepts TTL-level inputs (AHCT family), making it directly compatible with 5V microcontrollers and 3.3V logic outputs without level-shifting, unlike 74HC138 which typically requires 2V to 6V supply and CMOS-level inputs.
Can SN74AHCT138N be cascaded to decode more than 8 addresses?
Yes. SN74AHCT138N includes 3 enable inputs that can be connected to address lines or outputs of another decoder, enabling straightforward cascading to build 4-to-16 or larger address decoders using 2 or more devices across a 16-pin PDIP footprint.
Which PCB assembly method does the SN74AHCT138N PDIP package support?
The 16-pin PDIP package uses a 2.54 mm through-hole pitch with a 7.62 mm row spacing, supporting manual insertion and wave soldering. This makes SN74AHCT138N easy to use on breadboards and standard through-hole PCBs in prototype and low-volume production runs.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 25+ | $0.4454 | $11.13 |
| 100+ | $0.4119 | $41.19 |
| 250+ | $0.3563 | $89.08 |
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