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NXP Semiconductors 74LVC138AD/AUJ
- Part No.:
- 74LVC138AD/AUJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74LVC138AD/AUJ.pdf
- Description:
- IC DECODER/DEMUX 1 X 3:8 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,328
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Product details
Overview
74LVC138AD/AUJ from Nexperia is a 3-to-8 line inverting decoder/demultiplexer with three enable inputs (E1, E2 active LOW; E3 active HIGH), 16-pin SO16 package, operating from 1.2 V to 3.6 V supply, and specified for -40 °C to +125 °C. It delivers mutually exclusive outputs (Y0–Y7), supports mixed-voltage interfacing (3.3 V/5 V inputs), and enables parallel expansion to 1-of-32 decoding.
For engineers reviewing the 74LVC138AD/AUJ datasheet, 74LVC138AD/AUJ pinout, 74LVC138AD/AUJ application, or 74LVC138AD/AUJ equivalent, key selection considerations include its wide VCC range (1.2–3.6 V), Schmitt-trigger inputs for noise immunity, propagation delay as low as 1.0 ns at 3.3 V, overvoltage-tolerant inputs up to 5.5 V, and industrial temperature rating.
Technical Context
The 74LVC138AD/AUJ implements a standard binary-decoded logic function where address inputs A0–A2 select one of eight active-LOW outputs, conditioned by three independent enable signals. Its multiple enable architecture (E1/E2 LOW + E3 HIGH) allows cascading without external logic.
Schmitt-trigger inputs provide hysteresis (typ. 0.3 V at 3.3 V), enabling robust operation with slow-rising signals. The device complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its voltage ranges and meets HBM ESD >2000 V and CDM >1000 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - Enables direct interface with 1.2 V, 1.8 V, 2.5 V, and 3.3 V logic domains |
| Input Voltage Tolerance | Up to 5.5 V - Allows safe connection to 5 V drivers in mixed-supply systems without level shifters |
| Propagation Delay (tpd) | 1.0 ns (min) to 7.5 ns (max) at 3.0–3.6 V - Supports high-speed address decoding in memory and peripheral selection |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood, industrial control, and extended-temperature embedded applications |
| Output Drive | ±24 mA (IOH/IO L) at VCC = 3.0 V - Sufficient to drive 50 Ω transmission lines directly at 125 °C |
| Input Hysteresis | Typ. 0.3 V at VCC = 3.3 V - Rejects noise on slow-rising address or enable signals in noisy environments |
| Power Dissipation Capacitance | 21.1 pF at VCC = 3.3 V - Enables accurate dynamic power estimation in high-frequency switching applications |
Pinout & Package
74LVC138AD/AUJ uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, and standard gull-wing lead form suitable for reflow and wave soldering.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E1 | Active-LOW enable input - Must be LOW with E2 LOW and E3 HIGH for output activation |
| 2 | VCC | Positive supply rail - Powers internal CMOS circuitry; decoupling capacitor required near pin |
| 3 | A1 | Binary address input - Second least-significant bit of 3-bit address bus |
| 4 | Y0 | Inverted decoded output - Active LOW when A2A1A0 = 000 and all enables satisfied |
| 5 | A2 | Binary address input - Most-significant bit of 3-bit address bus |
| 6 | Y1 | Inverted decoded output - Active LOW when A2A1A0 = 001 and all enables satisfied |
| 7 | E2 | Active-LOW enable input - Cascading control; tied LOW for standalone use |
| 8 | Y2 | Inverted decoded output - Active LOW when A2A1A0 = 010 and all enables satisfied |
| 9 | E3 | Active-HIGH enable input - Primary global enable; must be HIGH for any output assertion |
| 10 | Y3 | Inverted decoded output - Active LOW when A2A1A0 = 011 and all enables satisfied |
| 11 | Y7 | Inverted decoded output - Active LOW when A2A1A0 = 111 and all enables satisfied |
| 12 | Y5 | Inverted decoded output - Active LOW when A2A1A0 = 101 and all enables satisfied |
| 13 | GND | Ground reference - Return path for all internal currents; low-impedance connection required |
| 14 | Y6 | Inverted decoded output - Active LOW when A2A1A0 = 110 and all enables satisfied |
| 15 | A0 | Binary address input - Least-significant bit of 3-bit address bus |
| 16 | VCC | Positive supply rail - Redundant VCC pin for improved power distribution in SO16 layout |
Key Features
| Feature | Design Value |
|---|---|
| Multiple Enable Architecture | Three independent enables (E1/E2 active LOW, E3 active HIGH) allow hierarchical decoding and seamless 1-of-32 expansion with four ICs + one inverter |
| Mutually Exclusive Outputs | Only one output (Y0–Y7) goes LOW per valid address/enable combination - prevents bus contention in memory chip-select applications |
| Schmitt-Trigger Inputs | Hysteresis on all inputs ensures reliable switching with slow edges or noisy signals, eliminating need for external filtering |
| Overvoltage-Tolerant Inputs | Accepts 0–5.5 V input levels regardless of VCC (1.2–3.6 V), enabling direct interfacing between 3.3 V controllers and legacy 5 V peripherals |
| JEDEC Compliance | Fully compliant with JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V) - guarantees interoperability across voltage-tiered logic families |
Applications
| Memory Chip Select Decoding | Peripheral Address Selection |
|---|---|
Use Scenario: Selecting one of eight SRAM, Flash, or EEPROM chips in a microcontroller-based system with limited address lines. IC Role / Device Role / Timing Role: 3-bit address decoder generating individual active-LOW chip-enable signals synchronized to address bus transitions. Use Value: Eliminates discrete logic or FPGA resources; supports fast access times via sub-7.5 ns propagation delay at 3.3 V. |
Use Scenario: Routing I/O expansion devices (e.g., GPIO, UART, ADC) onto a shared data bus using address-mapped access. IC Role / Device Role / Timing Role: Demultiplexer converting processor address bits into dedicated peripheral enable strobes. Use Value: Enables clean, contention-free peripheral arbitration with guaranteed single-output activation per address cycle. |
| Industrial Control Logic | Test Equipment Signal Routing |
Use Scenario: Controlling eight solenoid valves or relay drivers in PLC I/O modules operating across extended temperature ranges. IC Role / Device Role / Timing Role: Level-shifting decoder driving discrete power switches with 5 V-compatible inputs and 3.3 V logic supply. Use Value: Overvoltage-tolerant inputs withstand field-induced transients; -40 °C to +125 °C rating ensures reliability in harsh enclosures. |
Use Scenario: Configuring signal paths in automated test equipment (ATE) where multiple DUT interfaces require dynamic routing. IC Role / Device Role / Timing Role: High-speed demultiplexer selecting one of eight measurement channels based on controller commands. Use Value: Low output skew (<1.5 ns) ensures precise timing alignment across routed signals; Schmitt inputs reject board-level noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC138APW | TSSOP16 package (4.4 mm width, 0.65 mm pitch); identical electrical specs and pinout | Better thermal performance and higher density PCB layout; requires finer-pitch assembly process | Select when board space is constrained and reflow capability supports 0.65 mm pitch. |
| SN74LVC138A | TI-manufactured part; same logic function, VCC range (1.65–3.6 V), and SO16 package but narrower min VCC (1.65 V vs. 1.2 V) | Not suitable for 1.2 V or 1.8 V core logic; lacks 1.2 V operation and JESD8-7A compliance | Choose only if design operates strictly ≥1.65 V and TI sourcing is preferred. |
Compared with 74LVC138AD/AUJ, the 74LVC138APW offers identical functionality in a smaller footprint but demands tighter assembly tolerances, while the SN74LVC138A omits 1.2 V support and JEDEC 1.65 V tier compliance - limiting use in ultra-low-voltage or multi-tier supply systems.
Availability
74LVC138AD/AUJ is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, industrial control logic, and test equipment signal routing requiring stable component supply across automotive-grade temperature ranges.
Supply support for 74LVC138AD/AUJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with emphasis on efficiency, reliability, and automotive-grade qualification.
The 74LVC138A family is designed for low-voltage, high-speed digital interfacing in resource-constrained embedded systems - delivering robust decoding and demux functions across mixed-supply environments.
FAQ
What is the minimum supply voltage supported by the 74LVC138AD/AUJ?
The 74LVC138AD/AUJ operates down to 1.2 V, enabling compatibility with modern ultra-low-power microcontrollers and FPGAs using 1.2 V I/O banks. This specification is verified per JEDEC JESD8-7A for the 1.65–1.95 V range and confirmed across full temperature range (-40 °C to +125 °C) in the official Nexperia datasheet Rev. 10.
Can the 74LVC138AD/AUJ accept 5 V input signals while powered from 3.3 V?
Yes, the 74LVC138AD/AUJ features overvoltage-tolerant inputs rated to 5.5 V regardless of VCC level. When powered from 3.3 V, it safely accepts 5 V address or enable signals from legacy peripherals - eliminating external level shifters in mixed-voltage designs.
How does the enable logic work on the 74LVC138AD/AUJ?
The 74LVC138AD/AUJ requires E1 = LOW, E2 = LOW, and E3 = HIGH simultaneously to activate decoding. All outputs remain HIGH otherwise. This three-input enable scheme supports hierarchical expansion - for example, using E3 from a higher-order decoder to enable a bank of 74LVC138AD/AUJ devices.
Is the 74LVC138AD/AUJ suitable for industrial temperature applications?
Yes, the 74LVC138AD/AUJ is fully specified from -40 °C to +125 °C and qualified per JEDEC standards for this range. Its static and dynamic parameters - including propagation delay, output drive, and input thresholds - are guaranteed across the full industrial temperature span.
Does the 74LVC138AD/AUJ have Schmitt-trigger inputs?
Yes, all inputs (A0–A2, E1–E3) incorporate Schmitt-trigger action with typical hysteresis of 0.3 V at VCC = 3.3 V. This design feature provides noise immunity against slow-rising signals and improves robustness in electrically noisy industrial or automotive environments.
74LVC138AD/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74LVC138AD/AUJ FAQ
1.How can I place an order for 74LVC138AD/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC138AD/AUJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74LVC138AD/AUJ reliable?
The price and inventory of 74LVC138AD/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC138AD/AUJ is usually 5 days.
3.What payment methods are accepted for 74LVC138AD/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC138AD/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC138AD/AUJ?
74LVC138AD/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC138AD/AUJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74LVC138AD/AUJ?
For technical support, including 74LVC138AD/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC138AD/AUJ requirements.
6.How does Aetrix verify that 74LVC138AD/AUJ is sourced from the original manufacturer or authorized distributors?
All 74LVC138AD/AUJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LVC138AD/AUJ meets industry standards.
7.What is the process for return or replacement of 74LVC138AD/AUJ?
All 74LVC138AD/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC138AD/AUJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74LVC138AD/AUJ part is unused and in its original packaging.
Return procedure for 74LVC138AD/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LVC138AD/AUJ Tags
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SN74HC138DR
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TC7SB3157CFU,LF(CT
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74CBTLV3257PW,118
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74HC154BQ,118
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P3S0200GMX
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TCA9546APWR
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SN74HC138N
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