SN74AHCT138QDRG4Q1 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74AHCT138QDRG4Q1 is an automotive-grade 3-to-8 line decoder/demultiplexer from Texas Instruments in the AHCT logic family. It features 3 enable inputs, active-low outputs, and an 8 mA IOL drive capability. Supplied in a 16-pin SOIC package, it supports address decoding and chip-select generation in AEC-Q100 qualified automotive systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHCT138QDRG4Q1 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74AHCT138QDRG4Q1?
- AEC-Q100 automotive qualification for use in safety-critical vehicle electronics
- 3-to-8 line decoder with 3 enable inputs for flexible chip-select and address decoding
- Active-low outputs with 8 mA IOL drive strength compatible with AHCT/VHCT logic levels
- 50 pF rated load capacitance for stable high-speed switching on automotive PCB traces
- 16-pin SOIC package for compact SMT integration in space-constrained automotive modules
What is SN74AHCT138QDRG4Q1 used for?
The SN74AHCT138QDRG4Q1 is designed for automotive body control modules, infotainment systems, and ADAS sensor interface boards requiring AEC-Q100 qualified address decoding. Its 3 enable inputs and 8-output structure make it ideal for memory map decoding, peripheral chip-select generation, and bus demultiplexing in harsh automotive operating environments.
What are the specifications of SN74AHCT138QDRG4Q1?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | 3 ENABLE INPUTS |
| Family | AHCT/VHCT/VT |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 3-LINE TO 8-LINE DECODER |
| Max I(ol) | 0.008A |
| Number of Functions | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 13ns |
| Propagation Delay (tpd) | 13ns |
| Qualification Status | Not Qualified |
| Screening Level | AEC-Q100 |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74AHCT138QDRG4Q1 datasheet?
SN74AHCT138QDRG4Q1 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHCT138QDRG4Q1?
Compatible alternatives and drop-in replacements for SN74AHCT138QDRG4Q1:
Frequently Asked Questions
What AEC-Q100 grade does SN74AHCT138QDRG4Q1 meet, and which automotive temperature range does it cover?
The SN74AHCT138QDRG4Q1 is part of the Texas Instruments Q1 automotive-qualified series, targeting AEC-Q100 Grade requirements for automotive applications. Its AHCT logic family is designed for operation across the extended automotive temperature range, making it suitable for under-hood and body-module environments that see temperatures beyond commercial -40°C to 85°C limits.
How do the 3 enable inputs on SN74AHCT138QDRG4Q1 simplify multi-chip address decoding in an MCU system?
With 3 enable inputs (two active-low, one active-high), the SN74AHCT138QDRG4Q1 allows direct connection to address bus lines without external glue logic. A designer can cascade multiple decoders using the enable pins to expand from 8 chip-selects to 64 or more, reducing total component count while maintaining 8 mA drive strength per output.
Is SN74AHCT138QDRG4Q1 a drop-in pin-compatible replacement for SN74HC138 in an existing SOIC-16 footprint?
Yes, the SN74AHCT138QDRG4Q1 uses the same 16-pin SOIC (PDSO-G16) pinout as the standard SN74HC138, making it a functional pin-compatible upgrade. The AHCT family accepts 5 V TTL-level inputs while operating from a 3.3 V to 5 V supply, enabling it to replace HC138 in existing designs that require automotive qualification without PCB layout changes.
What load capacitance and output current specs should engineers verify when driving multiple CMOS inputs from SN74AHCT138QDRG4Q1 outputs?
Each output of the SN74AHCT138QDRG4Q1 is rated for 50 pF load capacitance and a maximum IOL of 8 mA, which supports driving 4 to 6 standard CMOS gate inputs on typical PCB traces. For heavier fanout loads or longer traces, a 33-ohm series termination resistor is recommended to preserve signal integrity and keep propagation delay within AHCT specification.
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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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