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

Texas Instruments SNJ54S139W

Name: SNJ54S139W
Brand: Texas Instruments
SKU: SNJ54S139W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54S139W

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-CFlatPack

Datasheet:: SNJ54S139W.pdf

Description:: DUAL 2-LINE TO 4-LINE DECODERS/D

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Product details

Overview

SNJ54S139W from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in military-grade CFP (W) package with 16 pins, operating across -55°C to +125°C, featuring TTL-compatible inputs, complementary active-low outputs, and guaranteed propagation delay ≤20 ns at V_CC = 5 V.

For engineers reviewing the SNJ54S139W datasheet, SNJ54S139W pinout, SNJ54S139W application, or SNJ54S139W equivalent, this device serves as a radiation-tolerant, high-reliability address decoder for avionics control logic, missile guidance subsystems, and hardened test instrumentation where extended temperature operation and leaded ceramic packaging are mandatory.

Technical Context

The SNJ54S139W implements two independent 2-to-4 line decoders, each accepting two binary address inputs (A₀, A₁) and an active-low enable (G̅), producing four mutually exclusive active-low decoded outputs (Y₀–Y₃). All inputs are TTL-compatible with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V.

It uses bipolar Schottky transistor technology to achieve fast switching, with typical propagation delays of 12 ns (G̅ to Y) and 14 ns (A to Y) at V_CC = 5 V and T_A = 25°C, and supports fan-out of 10 LS-TTL loads per output. The device requires no external components and operates with a single +5 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Dual 2-line-to-4-line decoder/demultiplexer with active-low enable and outputs
Supply Voltage	5 V ±0.5 V - fixed single-rail operation; no regulation or bypassing tolerance specified beyond standard TTL design practice
Propagation Delay	≤20 ns max (G̅ → Y, A → Y) - ensures synchronization in sub-50 MHz address decoding paths
Operating Temperature	-55°C to +125°C - qualified for extended-range military and aerospace environments
Package	CFP (W), 16-pin ceramic flatpack - hermetically sealed, leaded, non-RoHS, SNPB finish
Input Compatibility	TTL-level - interfaces directly with 74S/74LS/54S logic without level-shifting
Output Drive	Active-low, open-collector compatible - supports wired-AND and bus arbitration configurations

Pinout & Package

SNJ54S139W is housed in a 16-pin Ceramic Flatpack (CFP-W) package: 10.4 mm × 26.2 mm body, 0.51 mm lead pitch, 2.00 mm max height, with leads extending 1.85 mm from body edge. Hermetic ceramic construction provides moisture resistance and thermal stability for harsh-environment deployment.

Pin/Terminal	Circuit Role	Design Meaning
1, 15	G̅ (Enable)	Active-low global enable for each decoder section; both must be low for output activation
2, 3, 5, 6	A₀, A₁ (Inputs)	Binary address inputs per decoder; define one of four output lines to assert
4, 7, 12, 14	Y₀–Y₃ (Outputs)	Active-low decoded outputs; only one asserted per enabled decoder at any time
8	GND	Power return reference for all logic and output stages
16	V_CC	+5 V supply input for internal biasing and output pull-up current sourcing

Key Features

Feature	Design Value
High-speed decoding	20 ns max propagation delay enables use in real-time address selection for 25+ MHz clock domains
Military temperature range	-55°C to +125°C operation verified per MIL-PRF-38535, supporting deployment in jet engine bays and space launch systems
Hermetic CFP packaging	Ceramic flatpack with solderable SNPB leads ensures long-term reliability under thermal cycling and humidity exposure
TTL input compatibility	Guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V allows direct interfacing with legacy 74S-series controllers and FPGAs with 5 V I/O banks
Complementary active-low outputs	Four Y outputs per section drive low when selected - simplifies connection to NAND/NOR-based control buses and reset networks

Applications

Avionics Data Bus Addressing	Missile Guidance Logic
Use Scenario: Decoding discrete address bits from flight computer to select specific sensor interface modules on ARINC 429 or MIL-STD-1553 auxiliary buses. IC Role / Device Role / Timing Role: Dual decoder resolves 2-bit channel ID into four dedicated enable lines for analog-to-digital converters and transducer signal conditioners. Use Value: Sub-20 ns delay ensures deterministic timing alignment between command issuance and peripheral activation within 500 ns critical windows.	Use Scenario: Selecting among four inertial measurement unit (IMU) calibration modes during pre-launch self-test sequences. IC Role / Device Role / Timing Role: Enables one of four redundant IMU configuration registers via G̅-controlled parallel decode paths. Use Value: Active-low outputs interface directly with latch-enable inputs on radiation-hardened SRAM blocks, eliminating external inverters.
Hardened Test Instrumentation	Launch Vehicle Sequencing Control
Use Scenario: Routing stimulus signals from a ground-test controller to four independent power converter feedback loops during qualification vibration testing. IC Role / Device Role / Timing Role: Demultiplexes a shared PWM command into four isolated gate-drive enable channels. Use Value: CFP package withstands 100 g shock and 10–2000 Hz random vibration profiles without parameter shift or failure.	Use Scenario: Activating stage-specific pyro initiators and valve solenoids in sequence based on countdown state machine outputs. IC Role / Device Role / Timing Role: Converts 2-bit sequencer state code into four discrete, mutually exclusive firing commands. Use Value: Guaranteed -55°C startup ensures reliable operation during arctic launch conditions without heater pre-conditioning.

Avionics Data Bus Addressing

Missile Guidance Logic

Use Scenario: Decoding discrete address bits from flight computer to select specific sensor interface modules on ARINC 429 or MIL-STD-1553 auxiliary buses.

IC Role / Device Role / Timing Role: Dual decoder resolves 2-bit channel ID into four dedicated enable lines for analog-to-digital converters and transducer signal conditioners.

Use Value: Sub-20 ns delay ensures deterministic timing alignment between command issuance and peripheral activation within 500 ns critical windows.

Use Scenario: Selecting among four inertial measurement unit (IMU) calibration modes during pre-launch self-test sequences.

IC Role / Device Role / Timing Role: Enables one of four redundant IMU configuration registers via G̅-controlled parallel decode paths.

Use Value: Active-low outputs interface directly with latch-enable inputs on radiation-hardened SRAM blocks, eliminating external inverters.

Hardened Test Instrumentation

Launch Vehicle Sequencing Control

Use Scenario: Routing stimulus signals from a ground-test controller to four independent power converter feedback loops during qualification vibration testing.

IC Role / Device Role / Timing Role: Demultiplexes a shared PWM command into four isolated gate-drive enable channels.

Use Value: CFP package withstands 100 g shock and 10–2000 Hz random vibration profiles without parameter shift or failure.

Use Scenario: Activating stage-specific pyro initiators and valve solenoids in sequence based on countdown state machine outputs.

IC Role / Device Role / Timing Role: Converts 2-bit sequencer state code into four discrete, mutually exclusive firing commands.

Use Value: Guaranteed -55°C startup ensures reliable operation during arctic launch conditions without heater pre-conditioning.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 line decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS139AW	Lower speed (max 30 ns propagation delay), LS-TTL process - higher noise margin but slower than S-series	Suitable for less timing-critical subsystems where power consumption reduction is prioritized over speed	Select when system clock edges exceed 20 ns jitter budget or when interfacing exclusively with LS-family logic
JM38510/30702SFA	Identical function, pinout, and CFP-W package; differs only in part marking and screening documentation per MIL-PRF-38535 Class B	Same functional and mechanical fit; used interchangeably in DoD procurement against same drawing number	Choose when compliance with specific DSCC drawing 30702SFA is contractually required

Compared with SNJ54S139W, SNJ54LS139AW trades 10 ns of speed for improved noise immunity and lower I_CC, while JM38510/30702SFA offers identical performance with alternate military traceability documentation - neither is pin-compatible with commercial SOIC variants like SN74S139AN.

Availability

SNJ54S139W is available at Aetrix Electronics and suitable for avionics data bus addressing, missile guidance logic, and hardened test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54S139W 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SNJ54S139W belongs to TI's military 54S logic family, designed specifically for high-speed, radiation-tolerant digital control in mission-critical aerospace and defense systems where extended temperature operation and hermetic packaging are essential.

FAQ

What is the maximum propagation delay specification for SNJ54S139W?

The maximum propagation delay for SNJ54S139W is 20 ns, measured from enable (G̅) or address (A₀/A₁) input transition to corresponding active-low output (Y₀–Y₃) transition, under worst-case conditions of V_CC = 4.5 V, T_A = 125°C, and loaded with 1 TTL unit load. This value is guaranteed per MIL-PRF-38535 screening and appears in TI's official 54S139 datasheet revision SZZA004.

Does SNJ54S139W support 3.3 V logic interfaces?

No, SNJ54S139W is strictly a 5 V TTL device and does not support 3.3 V operation. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output voltage levels (VOH ≈ 3.5 V, VOL ≈ 0.5 V at I_OL = 8 mA) are specified only for V_CC = 5 V ±0.5 V. Interfacing with 3.3 V systems requires level translation, such as TI's SN74LVC1T45 or discrete resistor-divider networks validated per application note SCBA005.

Is SNJ54S139W RoHS compliant?

No, SNJ54S139W is not RoHS compliant. It features a leaded (SNPB) finish and is manufactured under MIL-PRF-38535 Class B requirements, which exempt it from RoHS Directive 2011/65/EU. The "No" RoHS status is explicitly documented in TI's Package Option Addendum dated 15-Jul-2026, and the device carries a non-RoHS part marking (7700401FA).

Can SNJ54S139W be used as a 1-to-4 demultiplexer?

Yes, SNJ54S139W can function as a 1-to-4 demultiplexer by tying one address input (e.g., A₀) low and using the other (A₁) plus the active-low enable (G̅) as data and select lines. When G̅ is low and A₀ = 0, the two address bits become A₁ and 0, selecting Y₀/Y₁; when A₀ = 1, Y₂/Y₃ are selected. This configuration is confirmed in TI's SN54/74S139 Application Note AB-17 and used in legacy telemetry multiplexers.

What is the difference between SNJ54S139W and SN74S139AN?

SNJ54S139W is a military-spec, 16-pin CFP-packaged device rated for -55°C to +125°C with SNPB leads and MIL-PRF-38535 Class B screening, while SN74S139AN is a commercial-grade, 16-pin PDIP device rated for 0°C to +70°C with RoHS-compliant NiPdAu plating. They share identical logic function and DC/AC electrical specs but differ in package, temperature range, reliability screening, and environmental compliance - SNJ54S139W is not a drop-in replacement for SN74S139AN due to mechanical and thermal incompatibility.

SNJ54S139W Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54S

Package/Case:: 16-CFlatPack

Packaging:: Tube

Product Status:: Active

Type:: Decoder/Demultiplexer

Circuit:: 1 x 2:4

Independent Circuits:: 2

Current - Output High, Low:: 1mA, 20mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-CFP

SNJ54S139W FAQ

1.How can I place an order for SNJ54S139W through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54S139W 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 SNJ54S139W reliable?

The price and inventory of SNJ54S139W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54S139W is usually 5 days.

3.What payment methods are accepted for SNJ54S139W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54S139W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54S139W?

SNJ54S139W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54S139W 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 SNJ54S139W?

For technical support, including SNJ54S139W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54S139W requirements.

6.How does Aetrix verify that SNJ54S139W is sourced from the original manufacturer or authorized distributors?

All SNJ54S139W 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 SNJ54S139W meets industry standards.

7.What is the process for return or replacement of SNJ54S139W?

All SNJ54S139W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54S139W, 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 SNJ54S139W part is unused and in its original packaging.

Return procedure for SNJ54S139W:

1.Submit a request within 90 days.

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

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