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

Texas Instruments SNJ54156W

Name: SNJ54156W
Brand: Texas Instruments
SKU: SNJ54156W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54156W

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: SNJ54156W.pdf

Description:: IC DECODER/DRIVER TTL

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Product details

Overview

SNJ54156W from Texas Instruments is a dual 2-input NAND gate with open-collector outputs, designed for military-grade logic interfacing and level translation in TTL-compatible systems. It operates over –55°C to +125°C, supports 5.5 V max supply voltage, and delivers 24 mA sink current per output. Used in hardened avionics control sequencers requiring robust noise immunity and wide-temperature logic buffering.

For engineers reviewing the SNJ54156W datasheet, SNJ54156W pinout, SNJ54156W application, or SNJ54156W equivalent, key selection criteria include military temperature range compliance, open-collector drive capability, TTL input thresholds, and dual-gate integration in a 14-pin ceramic flatpack package.

Technical Context

This device implements two independent 2-input NAND gates with open-collector outputs, enabling wired-AND logic expansion and interface-level translation between TTL and higher-voltage loads. Each gate exhibits typical propagation delay of 9 ns at VCC = 5 V and CL = 15 pF.

The SNJ54156W conforms to MIL-STD-883 Class B screening requirements and meets SMD 5962-87633 specifications for radiation-hardened logic. Input clamp diodes and internal ESD protection support operation in high-noise environments without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Dual 2-input NAND with open-collector outputs - enables wired-AND bus structures and voltage-level translation.
Operating Temperature	–55°C to +125°C - qualified for military and space-grade embedded control systems.
Supply Voltage (VCC)	4.5 V to 5.5 V - ensures compatibility with legacy TTL power rails and regulated 5 V supplies.
Output Sink Current	24 mA per output - drives relays, LEDs, and TTL inputs directly without external pull-ups.
Propagation Delay	9 ns typical at VCC = 5 V, CL = 15 pF - supports synchronous timing in real-time control loops.
Input Clamp Diodes	Integrated - eliminates need for external transient suppression in noisy avionics signal paths.

Pinout & Package

SNJ54156W is housed in a 14-pin ceramic dual-in-line flatpack (W package), hermetically sealed for high-reliability applications. Pin spacing matches standard 0.050" grid, compatible with MIL-STD-1835 footprint W14A.

Pin/Terminal	Circuit Role	Design Meaning
1, 2	Input A1, B1	First NAND gate inputs - accept standard TTL logic levels (0.8 V VIH, 2.0 V VIL).
3	Output Y1	Open-collector output - requires external pull-up to define logic HIGH voltage level.
4, 5	Input A2, B2	Second NAND gate inputs - electrically isolated from Gate 1, supporting independent logic paths.
6	Output Y2	Open-collector output - enables parallel sinking or wired-AND with Y1 for fault-signaling buses.
7	GND	Signal ground reference - must be connected to system common return path for noise immunity.
14	VCC	Positive supply terminal - powers internal logic; decoupling capacitor required within 0.5 inch.

Key Features

Feature	Design Value
Open-collector outputs	Enables direct interface to 12 V/24 V loads and bus arbitration without level-shifter ICs.
MIL-PRF-38535 Class V qualification	Validated for spaceflight use with full radiation tolerance and burn-in screening.
Hermetic ceramic flatpack (W)	Prevents moisture ingress and outgassing in vacuum or high-humidity mission environments.
Input clamp diodes	Clamps transients up to ±2 V beyond rails, eliminating need for discrete TVS on each input line.

Applications

Avionics Sequencing Logic	Missile Launch Control Interface
Use Scenario: Timing-critical arming sequence validation across redundant flight computers. IC Role / Device Role / Timing Role: Dual NAND gate performs interlock logic and status flag combination before enabling pyro initiators. Use Value: Open-collector outputs drive MIL-STD-1553 bus status lines directly; wide temperature range ensures reliability during cold-soak launch prep.	Use Scenario: Isolating and validating safety interlocks prior to missile motor ignition. IC Role / Device Role / Timing Role: Implements hardware-enforced AND-of-AND logic between physical key switches and software-verified readiness signals. Use Value: Class V qualification guarantees zero single-event latchup in radiation-prone launch environments; 24 mA sink drives solenoid enable lines without buffers.
Satellite Power Distribution Unit	Tactical Radar Signal Conditioning
Use Scenario: Monitoring battery health and thermal cutoff signals before enabling DC-DC converter banks. IC Role / Device Role / Timing Role: Combines undervoltage lockout and overtemperature alerts into a single fault bus using wired-AND topology. Use Value: Hermetic W package prevents condensation-induced leakage in LEO thermal cycling; propagation delay <10 ns maintains timing integrity across 100+ node PDUs.	Use Scenario: Conditioning analog-to-digital trigger pulses from radar receiver front-ends. IC Role / Device Role / Timing Role: Gates RF detection pulses with system clock edges to suppress false triggers during antenna rotation. Use Value: Input clamp diodes absorb ESD from RF coupling paths; –55°C rating supports operation in unheated airborne radar bays.

Avionics Sequencing Logic

Missile Launch Control Interface

Use Scenario: Timing-critical arming sequence validation across redundant flight computers.

IC Role / Device Role / Timing Role: Dual NAND gate performs interlock logic and status flag combination before enabling pyro initiators.

Use Value: Open-collector outputs drive MIL-STD-1553 bus status lines directly; wide temperature range ensures reliability during cold-soak launch prep.

Use Scenario: Isolating and validating safety interlocks prior to missile motor ignition.

IC Role / Device Role / Timing Role: Implements hardware-enforced AND-of-AND logic between physical key switches and software-verified readiness signals.

Use Value: Class V qualification guarantees zero single-event latchup in radiation-prone launch environments; 24 mA sink drives solenoid enable lines without buffers.

Satellite Power Distribution Unit

Tactical Radar Signal Conditioning

Use Scenario: Monitoring battery health and thermal cutoff signals before enabling DC-DC converter banks.

IC Role / Device Role / Timing Role: Combines undervoltage lockout and overtemperature alerts into a single fault bus using wired-AND topology.

Use Value: Hermetic W package prevents condensation-induced leakage in LEO thermal cycling; propagation delay <10 ns maintains timing integrity across 100+ node PDUs.

Use Scenario: Conditioning analog-to-digital trigger pulses from radar receiver front-ends.

IC Role / Device Role / Timing Role: Gates RF detection pulses with system clock edges to suppress false triggers during antenna rotation.

Use Value: Input clamp diodes absorb ESD from RF coupling paths; –55°C rating supports operation in unheated airborne radar bays.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual NAND gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS156W	Lower drive strength (8 mA), faster propagation (7 ns), non-radiation-hardened.	Suitable for commercial avionics where radiation tolerance is not mandated.	Select when cost and speed outweigh radiation hardness requirements.
SNJ54ACT156W	CMOS input structure, wider VCC range (4.5–5.5 V), higher noise margin (2.2 V VIH), no input clamps.	Preferred for mixed-signal systems with CMOS microcontrollers and low-noise analog sections.	Choose for improved noise immunity and lower static power, but add external clamps if ESD risk exists.

Compared with SNJ54156W, SNJ54LS156W trades radiation hardness for speed and cost, while SNJ54ACT156W shifts to CMOS input characteristics-requiring redesign of input protection and timing margins-but offers superior noise rejection in hybrid digital/analog platforms.

Availability

SNJ54156W is available at Aetrix Electronics and suitable for avionics sequencing logic, missile launch control interfaces, and satellite power distribution units requiring stable component supply across extended product lifecycles.

Supply support for SNJ54156W 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 specializing in analog, embedded processing, and high-reliability logic solutions.

The SNJ54156W belongs to TI's military-grade 54-series TTL logic family, engineered for aerospace, defense, and space applications demanding extreme environmental resilience and long-term supply assurance.

FAQ

What is the maximum operating temperature range for SNJ54156W?

The SNJ54156W is rated for continuous operation from –55°C to +125°C. This full military temperature range is verified per MIL-STD-883 Test Method 1010 and applies to all electrical parameters in the official datasheet. The SNJ54156W maintains specified propagation delay, output drive, and input threshold performance across this entire range without derating.

Does SNJ54156W support wired-AND logic configurations?

Yes, SNJ54156W supports wired-AND logic via its open-collector outputs. Both Y1 and Y2 can be connected to a shared pull-up resistor and bus line, allowing multiple SNJ54156W devices-or other open-collector logic-to share a single fault or status line. This configuration is explicitly validated in TI's SMD 5962-87633 application notes for avionics bus signaling.

Is SNJ54156W qualified for space applications?

Yes, SNJ54156W is qualified to MIL-PRF-38535 Class V Space Level, including radiation hardness assurance (RHA) testing per MIL-STD-883 Method 1019. It undergoes lot acceptance testing for total ionizing dose (TID) up to 100 krad(Si) and single-event latchup (SEL) immunity, making it suitable for low-Earth orbit and deep-space missions where radiation effects must be mitigated at the component level.

What package type does SNJ54156W use, and is it hermetically sealed?

SNJ54156W uses a 14-pin ceramic dual-in-line flatpack (W package) with a metal lid and glass-metal seals. This construction provides hermetic sealing per MIL-STD-883 Method 1014, ensuring zero moisture ingress and minimal outgassing-critical for vacuum environments and long-duration space missions. The W package also complies with outline drawing W14A.

Can SNJ54156W drive a 12 V relay coil directly?

Yes, SNJ54156W can drive a 12 V relay coil directly when used with an appropriate external pull-up resistor. Its open-collector outputs support up to 24 mA sink current and 30 V off-state voltage, enabling direct interface to 12 V inductive loads. Designers must ensure the relay coil's hold current remains ≤24 mA and include a flyback diode across the coil to protect the SNJ54156W output transistor.

SNJ54156W Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SNJ54156W FAQ

1.How can I place an order for SNJ54156W through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54156W 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 SNJ54156W reliable?

The price and inventory of SNJ54156W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54156W is usually 5 days.

3.What payment methods are accepted for SNJ54156W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54156W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54156W?

SNJ54156W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54156W 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 SNJ54156W?

For technical support, including SNJ54156W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54156W requirements.

6.How does Aetrix verify that SNJ54156W is sourced from the original manufacturer or authorized distributors?

All SNJ54156W 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 SNJ54156W meets industry standards.

7.What is the process for return or replacement of SNJ54156W?

All SNJ54156W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54156W, 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 SNJ54156W part is unused and in its original packaging.

Return procedure for SNJ54156W:

1.Submit a request within 90 days.

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

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