SN74AHCT138NE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The SN74AHCT138NE4 is a 3-to-8 line decoder and demultiplexer from Texas Instruments' AHCT logic family. It features three enable inputs for cascading and active-low outputs, with 50 pF load capacitance and 8 mA output sink current. Ideal for address decoding and memory chip-select generation in digital systems.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHCT138NE4 Datasheet PDF
- Category
- Integrated Circuit
- 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 SN74AHCT138NE4?
- 3-to-8 line decoder with 8 active-low outputs for address demultiplexing
- Three enable inputs (2 active-low, 1 active-high) allow easy cascading to 4-to-16 decoder
- AHCT family: accepts 5 V CMOS inputs, operates from 4.5 V to 5.5 V supply
- 50 pF rated load capacitance for driving typical PCB traces
- AEC-Q100-qualified (E4 suffix) for automotive-grade reliability
What is SN74AHCT138NE4 used for?
The SN74AHCT138NE4 is commonly deployed in microprocessor address bus decoding to select among up to 8 memory banks or peripheral chip-selects from a 3-bit address. Its three enable inputs make it straightforward to expand to 4-to-16 or larger decode trees by cascading two devices with minimal external logic. Automotive ECUs, industrial controllers, and embedded computing boards leverage the E4 automotive qualification to ensure operation across the -40°C to +125°C temperature range.
What are the specifications of SN74AHCT138NE4?
| YTEOL | 0 |
| 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 | 8542.39.00.60 |
| Country of Origin | Malaysia, Mexico |
Where can I find the SN74AHCT138NE4 datasheet?
SN74AHCT138NE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHCT138NE4?
Compatible alternatives and drop-in replacements for SN74AHCT138NE4:
Frequently Asked Questions
How many enable inputs does the SN74AHCT138NE4 provide, and how do they affect cascading?
The SN74AHCT138NE4 has 3 enable inputs — 2 active-low and 1 active-high — allowing two devices to be cascaded to build a 4-to-16 line decoder without additional logic gates, which simplifies address-bus expansion designs.
What supply voltage and output sink current does the SN74AHCT138NE4 support?
The device operates from a 4.5 V to 5.5 V supply and can sink up to 8 mA per output, sufficient to drive standard TTL or CMOS loads at 50 pF on each of its 8 active-low decoder outputs.
Is the SN74AHCT138NE4 qualified for automotive applications, and over what temperature range does it operate?
Yes, the E4 suffix confirms AEC-Q100 automotive qualification, and the device operates reliably from -40°C to +125°C, making it suitable for under-hood automotive ECUs and industrial control panels with harsh thermal environments.
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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.
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