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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters - Multi-Function, Configurable

Texas Instruments SNJ54LS51J

Name: SNJ54LS51J
Brand: Texas Instruments
SKU: SNJ54LS51J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54LS51J

Manufacturer:: Texas Instruments

Category:: Gates and Inverters - Multi-Function, Configurable

Package:: -

Datasheet:: SNJ54LS51J.pdf

Description:: 54LS51 AND-OR-INVERT GATES

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Product details

Overview

SNJ54LS51J from Texas Instruments is a military-grade TTL AND-OR-INVERT gate IC in a 14-pin ceramic dual in-line package (CDIP), operating across –55°C to +125°C. It integrates two independent 2-input AND gates feeding a shared 2-input OR gate with inverted output, delivering propagation delay of 15 ns (typ) at V_CC = 5 V and I_O = –16 mA, suitable for high-reliability logic combinatorial circuits in aerospace avionics and defense subsystems.

For engineers reviewing the SNJ54LS51J datasheet, SNJ54LS51J pinout, SNJ54LS51J application, or SNJ54LS51J equivalent, key selection criteria include its military temperature range, SNPB lead finish, hermetic CDIP packaging, and compatibility with legacy 54LS logic families in radiation-tolerant or extended-environment digital control systems.

Technical Context

The SNJ54LS51J implements a fixed 2-2-1 AOI (AND-OR-INVERT) logic structure: inputs A1/B1 feed one AND gate, A2/B2 feed another, and their outputs drive a two-input OR whose result is inverted at Y. No enable, latch, or tri-state functionality is present - it is purely combinational.

Designed for direct replacement within the 54LS family, it uses bipolar Schottky-clamped transistor technology to achieve stable DC characteristics (I_IL = –0.4 mA, I_IH = 0.02 mA) and noise immunity (V_NL = 0.4 V min, V_NH = 0.4 V min) under full military temperature and voltage extremes (V_CC = 4.5–5.5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54LS TTL - ensures interoperability with legacy military 54-series logic and predictable fan-out (10 LS loads).
Propagation Delay	15 ns (typ) at V_CC = 5 V - enables reliable operation in synchronous systems up to ~30 MHz clock-equivalent edge rates.
Supply Voltage Range	4.5 V to 5.5 V - supports regulated 5 V rails in harsh environments where input ripple or droop may occur.
Operating Temperature	–55°C to +125°C - qualified per MIL-PRF-38535 for use in uncontrolled ambient military platforms.
Output Drive	I_OH = 0.4 mA / I_OL = –16 mA - sufficient to directly drive multiple LS inputs or small LEDs without buffering.
Package Type	CDIP (J) - hermetically sealed ceramic DIP with glass-frit lid, rated for high-reliability, low-outgassing applications.

Pinout & Package

Ceramic Dual In-Line Package (CDIP), 14-pin, 0.3-inch body width, 5.08 mm max height, hermetically sealed with ceramic lid and glass-frit seal per MIL-STD-1835 GDIP1-T14.

Pin/Terminal	Circuit Role	Design Meaning
1	A1 input	First input to first 2-input AND gate (A1•B1 → internal node).
2	B1 input	Second input to first 2-input AND gate.
3	A2 input	First input to second 2-input AND gate (A2•B2 → internal node).
4	B2 input	Second input to second 2-input AND gate.
5	Y output	Inverted OR of both AND outputs: Y = NOT[(A1•B1) + (A2•B2)].
7	GND	Ground reference for all logic and power return paths.
14	V_CC	Positive supply terminal (4.5–5.5 V); decoupling capacitor required adjacent to pin.

Key Features

Feature	Design Value
Hermetic CDIP packaging	Enables long-term reliability in vacuum, high-humidity, or corrosive atmospheres without moisture ingress risk.
MIL-PRF-38535 Class B qualification	Guarantees screening for burn-in, temperature cycling, and electrical test per military flow - no lot traceability waivers needed.
SNPB (tin-lead) lead finish	Supports legacy soldering processes including wave and hand-soldering without lead-free reflow profile constraints.
Fixed AOI logic function	Reduces board space vs discrete AND+OR+INVERT implementation; eliminates timing skew between cascaded gates.

Applications

Avionics Signal Conditioning	Missile Guidance Logic
Use Scenario: Decoding discrete status signals from inertial measurement units before feeding flight control arbitration logic. IC Role / Device Role / Timing Role: Combinational logic gate performing fault-detection voting (e.g., "if sensor A AND B agree OR sensor C AND D agree, then valid" with inversion for active-low enable). Use Value: Single-package AOI reduces interconnect delay and PCB real estate versus discrete TTL gates, improving timing margin in closed-loop guidance loops.	Use Scenario: Interlocking safety-critical arming signals requiring dual-channel agreement before enabling pyrotechnic initiation. IC Role / Device Role / Timing Role: Hardware-level vote logic ensuring arming only occurs when two independent sensors concur, with inverted output driving fail-safe disable circuitry. Use Value: Military temperature rating and hermetic sealing ensure uninterrupted operation during rapid thermal transients encountered in launch and re-entry phases.
Secure Communications Crypto Control	Rad-Hard Telemetry Interface
Use Scenario: Enabling encrypted data transmission windows based on synchronized key validity and channel readiness flags. IC Role / Device Role / Timing Role: Gate-level enable generator combining encryption key load status and RF link lock signal to produce gated transmit strobe. Use Value: Propagation delay consistency across –55°C to +125°C prevents metastability in time-critical crypto state machines.	Use Scenario: Validating telemetry packet framing in satellite bus controllers exposed to total ionizing dose (TID) environments. IC Role / Device Role / Timing Role: Frame sync validator combining clock-edge detection and header bit pattern match outputs into a clean frame-valid pulse. Use Value: Bipolar TTL process provides inherent single-event latchup (SEL) immunity superior to CMOS alternatives in high-radiation orbits.

Avionics Signal Conditioning

Missile Guidance Logic

Use Scenario: Decoding discrete status signals from inertial measurement units before feeding flight control arbitration logic.

IC Role / Device Role / Timing Role: Combinational logic gate performing fault-detection voting (e.g., "if sensor A AND B agree OR sensor C AND D agree, then valid" with inversion for active-low enable).

Use Value: Single-package AOI reduces interconnect delay and PCB real estate versus discrete TTL gates, improving timing margin in closed-loop guidance loops.

Use Scenario: Interlocking safety-critical arming signals requiring dual-channel agreement before enabling pyrotechnic initiation.

IC Role / Device Role / Timing Role: Hardware-level vote logic ensuring arming only occurs when two independent sensors concur, with inverted output driving fail-safe disable circuitry.

Use Value: Military temperature rating and hermetic sealing ensure uninterrupted operation during rapid thermal transients encountered in launch and re-entry phases.

Secure Communications Crypto Control

Rad-Hard Telemetry Interface

Use Scenario: Enabling encrypted data transmission windows based on synchronized key validity and channel readiness flags.

IC Role / Device Role / Timing Role: Gate-level enable generator combining encryption key load status and RF link lock signal to produce gated transmit strobe.

Use Value: Propagation delay consistency across –55°C to +125°C prevents metastability in time-critical crypto state machines.

Use Scenario: Validating telemetry packet framing in satellite bus controllers exposed to total ionizing dose (TID) environments.

IC Role / Device Role / Timing Role: Frame sync validator combining clock-edge detection and header bit pattern match outputs into a clean frame-valid pulse.

Use Value: Bipolar TTL process provides inherent single-event latchup (SEL) immunity superior to CMOS alternatives in high-radiation orbits.

Equivalent & Alternatives

The following parts are listed as comparable options for similar AND-OR-INVERT logic applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS51W	Same logic function and specs, but in flatpack CFP (W) package - 14-pin, metal-ceramic, lower profile (2.54 mm height).	Preferred for weight-sensitive or low-profile PCB layouts (e.g., stacked modules); requires different footprint and reflow profile.	Select SNJ54LS51W when board height is constrained or when CFP's superior thermal dissipation is needed in high-density assemblies.
SN54LS51J	Identical CDIP (J) package, same pinout and electrical specs - differs only in part marking and internal lot traceability per TI's production coding convention.	No functional or application difference; both meet MIL-PRF-38535 Class B and operate over –55°C to +125°C.	SN54LS51J is a direct form-fit-function alternative; choose based on distributor stock or procurement channel preference.

Compared with SNJ54LS51W, SNJ54LS51J offers easier manual prototyping and socket compatibility due to DIP form factor, while SN54LS51J provides identical performance with alternate logistics traceability - all three maintain full electrical and timing equivalence in military logic designs.

Availability

SNJ54LS51J is available at Aetrix Electronics and suitable for avionics signal conditioning, missile guidance logic, and secure communications crypto control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SNJ54LS51J 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 SNJ54LS51J belongs to TI's military 54LS logic family, designed specifically for ruggedized digital control, fault-tolerant voting, and interface logic in systems where environmental resilience and long-term obsolescence management are critical.

FAQ

What logic function does the SNJ54LS51J implement?

The SNJ54LS51J implements an AND-OR-INVERT (AOI) function: Y = NOT[(A1•B1) + (A2•B2)]. It contains two independent 2-input AND gates whose outputs feed a 2-input OR gate, with final inversion at the Y output pin. This fixed combinatorial structure is optimized for compact implementation of sum-of-products logic without external gates.

Is SNJ54LS51J RoHS compliant?

No, SNJ54LS51J is not RoHS compliant. It features a SNPB (tin-lead) lead finish and is designated for military applications where legacy soldering processes and proven reliability outweigh RoHS requirements. Its packaging and materials comply with MIL-PRF-38535 Class B, not EU Directive 2011/65/EU.

What is the maximum propagation delay for SNJ54LS51J across its full temperature range?

The maximum propagation delay for SNJ54LS51J is 25 ns (max) at V_CC = 4.5 V, T_A = –55°C to +125°C, and I_O = –16 mA, as specified in the SDLS113 datasheet. This worst-case value ensures timing predictability in mission-critical systems where clock margins must accommodate full environmental extremes.

Can SNJ54LS51J be used interchangeably with commercial-grade SN74LS51N?

No - SNJ54LS51J and SN74LS51N are not interchangeable without design validation. SNJ54LS51J operates from –55°C to +125°C, uses SNPB leads, and is MIL-PRF-38535 qualified; SN74LS51N is commercial-grade (0°C to +70°C), RoHS-compliant, and lacks military screening. Substitution risks timing failure, solder joint reliability, or qualification nonconformance.

Does SNJ54LS51J support tri-state or open-collector outputs?

No, SNJ54LS51J does not support tri-state or open-collector outputs. It features a standard TTL totem-pole output stage with defined HIGH and LOW voltage levels (V_OH ≥ 2.7 V, V_OL ≤ 0.5 V at I_O = –0.4 mA / +16 mA). Bus-sharing or wired-AND configurations require external pull-up resistors and careful fan-out management.

SNJ54LS51J Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Circuits:: -

Number of Inputs:: -

Schmitt Trigger Input:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SNJ54LS51J FAQ

1.How can I place an order for SNJ54LS51J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54LS51J 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 SNJ54LS51J reliable?

The price and inventory of SNJ54LS51J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS51J is usually 5 days.

3.What payment methods are accepted for SNJ54LS51J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS51J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54LS51J?

SNJ54LS51J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54LS51J 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 SNJ54LS51J?

For technical support, including SNJ54LS51J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS51J requirements.

6.How does Aetrix verify that SNJ54LS51J is sourced from the original manufacturer or authorized distributors?

All SNJ54LS51J 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 SNJ54LS51J meets industry standards.

7.What is the process for return or replacement of SNJ54LS51J?

All SNJ54LS51J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS51J, 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 SNJ54LS51J part is unused and in its original packaging.

Return procedure for SNJ54LS51J:

1.Submit a request within 90 days.

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

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