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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SNJ54LVC138AW

Name: SNJ54LVC138AW
Brand: Texas Instruments
SKU: SNJ54LVC138AW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54LVC138AW

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-CFlatPack

Datasheet:: SNJ54LVC138AW.pdf

Description:: 3-LINE TO 8-LINE DECODER/DEMULTI

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Product details

Overview

SNJ54LVC138AW from Texas Instruments is a 3-line to 8-line decoder/demultiplexer with active-high and dual active-low enables, operating over –55°C to 125°C at 2.7 V–3.6 V supply. It features 5.8 ns max propagation delay at 3.3 V, 5.5 V-tolerant inputs, and outputs driven low for selected channel (Y0–Y7) while others remain high. It is used in military-grade memory decoding and LED column scanning where deterministic low-latency address selection is required.

For engineers reviewing the SNJ54LVC138AW datasheet, SNJ54LVC138AW pinout, SNJ54LVC138AW application, or SNJ54LVC138AW equivalent, key selection criteria include its CFP-16 package, –55°C to 125°C temperature rating, 5.5 V input tolerance, enable logic configuration (G1 high-active, G2A/G2B low-active), and compatibility with legacy 54LVC logic families in harsh-environment systems.

Technical Context

The SNJ54LVC138AW implements standard 3-to-8 binary decoding with three select inputs (A, B, C) and three enable terminals (G1, G2A, G2B). Its function table requires G1 = HIGH and G2A = G2B = LOW for output activation; any enable violation forces all eight outputs high. The device uses CMOS technology with balanced drive strength and supports demultiplexing by repurposing an enable input as data path.

It operates strictly within the SN54LVC family specification: VCC = 2.7 V–3.6 V, guaranteed operation across –55°C to 125°C, and absolute maximum input voltage of 6.5 V. Input thresholds scale with VCC (VIH ≥ 0.65×VCC), and output drive capability is ±24 mA at 3.0 V, enabling direct interface with TTL loads and LED sinks without external buffers.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7 V to 3.6 V - Validated for full military temperature range (–55°C to 125°C); not rated for 1.65 V operation like commercial SN74LVC variants.
Propagation Delay (tpd)	5.8 ns max at VCC = 3.3 V - Enables synchronization with high-speed memory access cycles and real-time LED matrix refresh below 100 ns system latency budgets.
Input Voltage Tolerance	Up to 5.5 V - Allows direct interfacing with 5-V microcontrollers or legacy logic without level-shifting circuitry.
Output Drive Strength	±24 mA at VCC = 3.0 V - Sufficient to sink LED columns or drive TTL-compatible inputs without external transistors.
Enable Logic Configuration	G1 (active-high), G2A & G2B (active-low) - Supports hierarchical decoding expansion (e.g., 24-line decoder without inverters) and flexible demux control.
Operating Temperature	–55°C to 125°C - Qualified per MIL-PRF-38535 for aerospace, defense, and industrial control applications requiring extended thermal reliability.
ESD Rating (HBM)	2000 V - Meets JEDEC JS-001 Class 2; suitable for assembly environments with standard ESD controls.

Pinout & Package

SNJ54LVC138AW is supplied in a 16-pin Ceramic Flatpack (CFP) package (W package), body size 10.30 mm × 6.73 mm, with metal lid hermetic sealing for moisture and particle resistance.

Pin/Terminal	Circuit Role	Design Meaning
1	G2B	Active-low enable input - Must be LOW with G2A and G1 asserted to activate decoding; used for cascade control in multi-chip systems.
2	G2A	Active-low enable input - Dual enable architecture reduces external gate count when expanding to larger decoder trees.
3	G1	Active-high enable input - Primary chip-select signal; ties directly to address decode bus or microcontroller GPIO.
4	C	Most significant select input (MSB) - Determines upper half (Y4–Y7) vs lower half (Y0–Y3) of decoded outputs.
5	B	Middle select input - Combined with A and C, selects one of eight unique output lines per binary combination.
6	A	Least significant select input (LSB) - Provides fine-grained output selection; critical for sequential scanning timing alignment.
7	Y7	Active-low decoded output - Driven LOW when A=B=C=1; used for high-side or low-side switching depending on load topology.
8	GND	Ground reference - Requires low-inductance connection to minimize ground bounce affecting VOLP & VOHV specs.
9	Y6	Active-low decoded output - Shares same timing and drive characteristics as Y7; matched skew ≤1 ns ensures uniform column activation.
10	Y5	Active-low decoded output - Electrically identical to Y0–Y7; all outputs exhibit consistent VOL/VOLP under load.
11	Y4	Active-low decoded output - Enabled only when G1=HIGH, G2A=G2B=LOW, and C=1, B=0, A=0.
12	Y3	Active-low decoded output - Used in LED matrix column drivers where single-output activation prevents crosstalk.
13	Y2	Active-low decoded output - Matches Y0–Y7 in capacitive loading (Ci = 5 pF typical), supporting high-frequency switching up to 100 MHz.
14	Y1	Active-low decoded output - Output disable time (tPHZ/tPZH) ≤6.5 ns ensures fast blanking between scan phases.
15	Y0	Active-low decoded output (LSB) - Asserted when A=B=C=0; lowest propagation delay path among outputs.
16	VCC	Positive supply - Requires local 0.1-µF ceramic bypass capacitor; power integrity directly impacts tpd consistency and noise immunity.

Key Features

Feature	Design Value
3-to-8 decoding with triple enable	Enables hierarchical address decoding (e.g., 24-line using two SNJ54LVC138AWs) without external inverters, reducing board area and signal routing complexity.
5.5 V-tolerant inputs	Eliminates need for level shifters when interfacing with 5-V microcontrollers or FPGAs, simplifying mixed-voltage system design and improving signal integrity.
5.8 ns max tpd at 3.3 V	Supports sub-100 ns memory access cycles and real-time LED multiplexing at >10 kHz frame rates without pipeline stalls or timing margin violations.
–55°C to 125°C operation	Qualified to MIL-PRF-38535 Class V, enabling use in avionics, downhole tools, and engine control units where commercial-grade parts fail.
Low ground bounce (VOLP < 0.8 V)	Ensures stable logic thresholds during simultaneous output switching, preventing false triggering in adjacent digital or analog circuits.

Applications

LED Matrix Column Driver	Military Memory Address Decoder
Use Scenario: Driving 8-column LED displays in cockpit instrumentation panels requiring high reliability under vibration and thermal cycling. IC Role / Device Role / Timing Role: Low-side column selector that activates exactly one Yx output per A/B/C cycle while maintaining all others high, enabling precise current-controlled LED illumination. Use Value: Eliminates need for discrete transistor arrays; 24 mA sink capability directly drives LEDs at 20 mA, and 5.8 ns tpd ensures flicker-free 120 Hz refresh.	Use Scenario: Selecting memory banks in radiation-hardened flight computers where deterministic decode latency and wide temperature operation are mandatory. IC Role / Device Role / Timing Role: High-speed address decoder placed between CPU address bus and SRAM/ROM chips, minimizing added system access time. Use Value: Propagation delay <6.7 ns at 3.3 V ensures effective decode overhead remains below 5% of typical 120 ns SRAM access time.
Industrial I/O Multiplexer	Avionics Signal Router
Use Scenario: Routing sensor inputs (thermocouples, RTDs) to a single ADC channel in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Demultiplexer configured with G1 as data input and A/B/C as channel address, enabling 1-to-8 analog signal selection. Use Value: 5.5 V-tolerant inputs accept direct connection to industrial 24 V sensor interfaces via resistive dividers, reducing component count.	Use Scenario: Managing discrete signal paths (discrete warnings, status flags) in aircraft warning systems where failure modes must be bounded. IC Role / Device Role / Timing Role: Fault-isolated decoder ensuring only one output asserts at a time; triple-enable logic prevents spurious activation during power-up or reset. Use Value: Hermetic CFP package and –55°C to 125°C rating guarantee uninterrupted operation during rapid cabin depressurization or extreme ambient conditions.

LED Matrix Column Driver

Military Memory Address Decoder

Use Scenario: Driving 8-column LED displays in cockpit instrumentation panels requiring high reliability under vibration and thermal cycling.

IC Role / Device Role / Timing Role: Low-side column selector that activates exactly one Yx output per A/B/C cycle while maintaining all others high, enabling precise current-controlled LED illumination.

Use Value: Eliminates need for discrete transistor arrays; 24 mA sink capability directly drives LEDs at 20 mA, and 5.8 ns tpd ensures flicker-free 120 Hz refresh.

Use Scenario: Selecting memory banks in radiation-hardened flight computers where deterministic decode latency and wide temperature operation are mandatory.

IC Role / Device Role / Timing Role: High-speed address decoder placed between CPU address bus and SRAM/ROM chips, minimizing added system access time.

Use Value: Propagation delay <6.7 ns at 3.3 V ensures effective decode overhead remains below 5% of typical 120 ns SRAM access time.

Industrial I/O Multiplexer

Avionics Signal Router

Use Scenario: Routing sensor inputs (thermocouples, RTDs) to a single ADC channel in programmable logic controllers deployed in factory automation.

IC Role / Device Role / Timing Role: Demultiplexer configured with G1 as data input and A/B/C as channel address, enabling 1-to-8 analog signal selection.

Use Value: 5.5 V-tolerant inputs accept direct connection to industrial 24 V sensor interfaces via resistive dividers, reducing component count.

Use Scenario: Managing discrete signal paths (discrete warnings, status flags) in aircraft warning systems where failure modes must be bounded.

IC Role / Device Role / Timing Role: Fault-isolated decoder ensuring only one output asserts at a time; triple-enable logic prevents spurious activation during power-up or reset.

Use Value: Hermetic CFP package and –55°C to 125°C rating guarantee uninterrupted operation during rapid cabin depressurization or extreme ambient conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC138AD	SOIC-16 package, commercial temp range (–40°C to 85°C), 1.65 V–3.6 V supply, RoHS-compliant NiPdAu finish.	Targeted at cost-sensitive industrial and telecom equipment; lacks military qualification and hermetic sealing.	Select SN74LVC138AD only for non-mission-critical applications where extended temperature and reliability are not required.
SNJ54HC138W	CFP-16 package, same military temp range, but 2 V–6 V supply, slower 23 ns tpd at 4.5 V, TTL-compatible inputs.	Used in legacy 54HC-based systems; higher power consumption and reduced noise margin versus LVC family.	Choose SNJ54HC138W only when backward compatibility with existing 54HC designs is mandatory and speed is secondary.

Compared with SN74LVC138AD and SNJ54HC138W, SNJ54LVC138AW uniquely combines military temperature range, hermetic CFP packaging, 5.5 V-tolerant inputs, and 5.8 ns speed-making it irreplaceable in new high-reliability designs where all three attributes are simultaneously required.

Availability

SNJ54LVC138AW is available at Aetrix Electronics and suitable for military avionics, downhole instrumentation, and ruggedized industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54LVC138AW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions, with decades of heritage in space-qualified and military-grade components.

SNJ54LVC138AW belongs to TI's 54LVC logic family, engineered specifically for high-speed, low-voltage military and aerospace applications demanding robust performance across extreme temperatures and harsh environments.

FAQ

What is the operating temperature range of the SNJ54LVC138AW?

The SNJ54LVC138AW is fully specified and qualified for continuous operation from –55°C to 125°C. This military-grade temperature range is validated per MIL-PRF-38535 requirements and applies across all electrical parameters including propagation delay, output drive, and input thresholds. The SNJ54LVC138AW achieves this using hermetic CFP packaging and process controls distinct from commercial SN74LVC variants.

Does the SNJ54LVC138AW support 5-V input signals?

Yes, the SNJ54LVC138AW accepts input voltages up to 5.5 V regardless of VCC level, enabling direct interface with 5-V logic families without level shifters. This 5.5 V tolerance is explicitly tested and guaranteed in the datasheet, and applies to all inputs (A, B, C, G1, G2A, G2B). The feature is implemented via robust input protection structures inherent to the 54LVC process.

What package type is used for the SNJ54LVC138AW?

The SNJ54LVC138AW is packaged in a 16-pin Ceramic Flatpack (CFP), designated as the W package, with dimensions 10.30 mm × 6.73 mm. It features a metal lid and glass-sealed leads for hermeticity, meeting MIL-STD-883 requirements for moisture resistance and particle exclusion-critical for aerospace and defense deployments.

How does the enable logic work on the SNJ54LVC138AW?

The SNJ54LVC138AW uses three enable inputs: G1 (active-high), G2A (active-low), and G2B (active-low). All three must be simultaneously asserted-G1 = HIGH, G2A = LOW, G2B = LOW-for decoding to occur. If any enable is violated, all eight outputs (Y0–Y7) go HIGH. This architecture allows cascading multiple devices without external inverters, e.g., building a 24-line decoder using two SNJ54LVC138AWs.

What is the maximum propagation delay for the SNJ54LVC138AW?

The maximum propagation delay (tpd) for the SNJ54LVC138AW is 5.8 ns when measured from any select input (A, B, or C) or enable input (G1, G2A, G2B) to any output (Y0–Y7) at VCC = 3.3 V ± 0.3 V and TA = 25°C. This value is guaranteed across the full military temperature range, with worst-case delay increasing to 7.9 ns at –55°C and 125°C per characterization data.

SNJ54LVC138AW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LVC

Package/Case:: 16-CFlatPack

Packaging:: Tube

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:: 2V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-CFP

SNJ54LVC138AW FAQ

1.How can I place an order for SNJ54LVC138AW through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54LVC138AW 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 SNJ54LVC138AW reliable?

The price and inventory of SNJ54LVC138AW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LVC138AW is usually 5 days.

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Once your SNJ54LVC138AW 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 SNJ54LVC138AW?

For technical support, including SNJ54LVC138AW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LVC138AW requirements.

6.How does Aetrix verify that SNJ54LVC138AW is sourced from the original manufacturer or authorized distributors?

All SNJ54LVC138AW 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 SNJ54LVC138AW meets industry standards.

7.What is the process for return or replacement of SNJ54LVC138AW?

All SNJ54LVC138AW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVC138AW, 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 SNJ54LVC138AW part is unused and in its original packaging.

Return procedure for SNJ54LVC138AW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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