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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

Texas Instruments SNJ54LS38J

Name: SNJ54LS38J
Brand: Texas Instruments
SKU: SNJ54LS38J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54LS38J

Manufacturer:: Texas Instruments

Category:: Gates and Inverters

Package:: 14-CDIP (0.300", 7.62mm)

Datasheet:: SNJ54LS38J.pdf

Description:: IC GATE NAND 4CH 2-INP 14CDIP

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Product details

Overview

SNJ54LS38J from Texas Instruments is a military-grade quadruple 2-input positive-NAND buffer with open-collector outputs, designed for level-shifting, wired-AND logic, and bus interface applications in harsh environments. It operates over –55°C to +125°C, delivers 8 mA sink current per output, and features TTL-compatible input thresholds with LS-series low power consumption.

For engineers reviewing the SNJ54LS38J datasheet, SNJ54LS38J pinout, SNJ54LS38J application, or SNJ54LS38J equivalent, this device supports high-reliability digital interfacing where wide temperature range, radiation tolerance, and direct drive of LEDs, relays, or other loads are required.

Technical Context

The SNJ54LS38J implements four independent NAND gates, each with open-collector output topology enabling wired-AND configuration and voltage-level translation across different logic families. Its inputs accept standard TTL voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and outputs support up to 8 mA DC sink current at V_CC = 5 V.

It belongs to the 54LS logic family, offering lower power than standard 54-series while maintaining compatible propagation delay (t_PLH/t_PHL ≤ 25 ns typical at V_CC = 5 V, T_A = 25°C) and fan-out capability of 20 LS-TTL loads per output.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54LS - Low-power Schottky TTL, optimized for military temperature range and reduced static power vs. 54-series.
Function	Quadruple 2-input positive-NAND with open-collector outputs - enables wired-AND, bus arbitration, and load driving without external pull-ups in some configurations.
Supply Voltage	V_CC = 4.5 V to 5.5 V - ensures robust operation under varying power rail conditions in avionics and defense systems.
Output Sink Current	I_OL = 8 mA max per output at V_OL ≤ 0.5 V - sufficient to directly drive LEDs, small relays, or TTL inputs without buffering.
Propagation Delay	t_PD = 25 ns typical (max 35 ns) - supports reliable timing in synchronous control logic up to ~20 MHz edge rates.
Operating Temperature	–55°C to +125°C - qualified per MIL-PRF-38535 for extended environmental survivability in aerospace and ground vehicle systems.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - ensures compatibility with legacy TTL, LSTTL, and mixed-signal interface circuits.

Pinout & Package

Ceramic Dual-In-Line Package (CDIP), 14-pin, hermetically sealed with glass-frit lid (package code J). Height ≤ 5.08 mm, lead pitch 2.54 mm, body width 7.62 mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 9, 10, 12, 13	Input A/B per gate	Eight total inputs (two per NAND gate); TTL-compatible, no internal pull-up; require external termination for defined logic state when unused.
3, 6, 8, 11	Open-collector output	Four independent open-collector outputs; must be externally pulled up to V_CC or another logic rail to achieve HIGH state; enable wired-AND and level translation.
7	GND	Ground reference for all logic and output stages; requires low-impedance connection to minimize noise coupling in high-reliability systems.
14	V_CC	Positive supply terminal; decoupling capacitor (0.1 µF ceramic) recommended adjacent to pin for transient suppression in switching applications.

Key Features

Feature	Design Value
Open-collector outputs	Enable direct wired-AND bus structures and interface to higher-voltage logic families (e.g., 12 V CMOS) using external pull-up resistors.
Military temperature range	–55°C to +125°C operation validated per MIL-PRF-38535 Class B, supporting deployment in engine bays, radar housings, and space-qualified electronics.
Low-power Schottky design	Typical I_CC = 19 mA at 5 V - reduces thermal load and improves system-level power efficiency compared to standard 54-series equivalents.
TTL-compatible inputs	Accept standard TTL logic levels without level-shifting circuitry, simplifying integration into legacy digital subsystems and test equipment.
Hermetic CDIP packaging	Ceramic-glass seal provides moisture resistance and long-term reliability in high-humidity or vacuum environments where plastic packages degrade.

Applications

Industrial Control Bus Interface	Aerospace Sensor Signal Conditioning
Use Scenario: Interfacing microcontroller GPIOs to industrial PLC backplane buses requiring wired-AND arbitration and 24 V load driving. IC Role / Device Role / Timing Role: Level-translating NAND buffer providing open-collector outputs to sink PLC input currents while enabling shared-bus conflict detection. Use Value: Eliminates need for discrete transistors or additional logic; supports direct 24 V pull-up via external resistor, reducing component count and board area.	Use Scenario: Conditioning discrete fault signals from multiple redundant sensors in flight control computers operating across extreme thermal cycles. IC Role / Device Role / Timing Role: Glue logic element performing NAND-based voting and signal conditioning before feeding to radiation-hardened FPGA inputs. Use Value: Guaranteed operation at –55°C to +125°C with stable propagation delay ensures deterministic timing behavior in safety-critical avionics subsystems.
Test Equipment Digital I/O Expansion	Military Radio Front-End Control
Use Scenario: Expanding digital I/O channels on automated test equipment (ATE) platforms requiring high-noise immunity and direct LED/relay actuation. IC Role / Device Role / Timing Role: Output driver stage converting low-current logic signals into robust 8 mA sink outputs for panel indicators and relay coils. Use Value: Single IC replaces multiple discrete drivers; open-collector architecture allows flexible voltage selection (3.3 V, 5 V, or 12 V) for diverse peripheral types.	Use Scenario: Controlling RF switch matrices and filter bank selectors in tactical radios exposed to shock, vibration, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Logic interface between baseband processor and analog front-end components, implementing enable/disable sequencing with fail-safe defaults. Use Value: Hermetic CDIP package resists moisture ingress and mechanical stress; LS-series low power minimizes self-heating during continuous transmit mode.

Industrial Control Bus Interface

Aerospace Sensor Signal Conditioning

Use Scenario: Interfacing microcontroller GPIOs to industrial PLC backplane buses requiring wired-AND arbitration and 24 V load driving.

IC Role / Device Role / Timing Role: Level-translating NAND buffer providing open-collector outputs to sink PLC input currents while enabling shared-bus conflict detection.

Use Value: Eliminates need for discrete transistors or additional logic; supports direct 24 V pull-up via external resistor, reducing component count and board area.

Use Scenario: Conditioning discrete fault signals from multiple redundant sensors in flight control computers operating across extreme thermal cycles.

IC Role / Device Role / Timing Role: Glue logic element performing NAND-based voting and signal conditioning before feeding to radiation-hardened FPGA inputs.

Use Value: Guaranteed operation at –55°C to +125°C with stable propagation delay ensures deterministic timing behavior in safety-critical avionics subsystems.

Test Equipment Digital I/O Expansion

Military Radio Front-End Control

Use Scenario: Expanding digital I/O channels on automated test equipment (ATE) platforms requiring high-noise immunity and direct LED/relay actuation.

IC Role / Device Role / Timing Role: Output driver stage converting low-current logic signals into robust 8 mA sink outputs for panel indicators and relay coils.

Use Value: Single IC replaces multiple discrete drivers; open-collector architecture allows flexible voltage selection (3.3 V, 5 V, or 12 V) for diverse peripheral types.

Use Scenario: Controlling RF switch matrices and filter bank selectors in tactical radios exposed to shock, vibration, and wide ambient temperature swings.

IC Role / Device Role / Timing Role: Logic interface between baseband processor and analog front-end components, implementing enable/disable sequencing with fail-safe defaults.

Use Value: Hermetic CDIP package resists moisture ingress and mechanical stress; LS-series low power minimizes self-heating during continuous transmit mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS00J	Quad 2-input NAND gate with totem-pole (not open-collector) outputs; identical speed/power but lacks wired-AND capability.	Not suitable for bus arbitration or level translation; requires external pull-ups only if interfacing to higher voltages.	Select SNJ54LS00J only when push-pull drive is preferred and wired-AND is unnecessary.
SNJ54LS10J	Triple 3-input NAND gate with open-collector outputs; same temperature range and package, but different input count and gate count.	Used where 3-input logic functions or fewer gates per package are acceptable; not pin-compatible with SNJ54LS38J.	Choose SNJ54LS10J when system logic requires three-input NAND operations or board layout favors triple-gate density.

Compared with SNJ54LS00J and SNJ54LS10J, SNJ54LS38J uniquely combines quad 2-input NAND functionality with open-collector outputs in a 14-pin CDIP, making it irreplaceable for bus-oriented designs requiring both flexibility and military-grade reliability.

Availability

SNJ54LS38J is available at Aetrix Electronics and suitable for industrial control bus interface, aerospace sensor signal conditioning, and military radio front-end control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54LS38J 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 logic solutions with deep heritage in military-qualified components since the 1960s.

The SNJ54LS38J belongs to TI's 54LS logic product line, engineered specifically for high-reliability applications demanding extended temperature operation, hermetic packaging, and compliance with MIL-PRF-38535 standards.

FAQ

What is the maximum sink current per output of the SNJ54LS38J?

The SNJ54LS38J supports a maximum DC output sink current (I_OL) of 8 mA per open-collector output when V_OL ≤ 0.5 V at V_CC = 5 V. This rating is verified across the full –55°C to +125°C operating range and enables direct drive of LEDs, small relays, and TTL-compatible inputs without external amplification. The SNJ54LS38J maintains this performance under worst-case voltage and temperature conditions per MIL-PRF-38535 testing.

Does the SNJ54LS38J require external pull-up resistors on its outputs?

Yes, the SNJ54LS38J requires external pull-up resistors on all four open-collector outputs (pins 3, 6, 8, 11) to establish a valid HIGH logic level. The value depends on the target logic family and speed requirements - typical values range from 1 kΩ (for fast rise times into capacitive loads) to 10 kΩ (for low-power interfaces). Without pull-ups, outputs remain floating and undefined. The SNJ54LS38J does not include internal pull-ups.

Is the SNJ54LS38J RoHS compliant?

No, the SNJ54LS38J is not RoHS compliant. It uses SnPb (tin-lead) lead finish per the manufacturer's packaging data, and is designated as "No" under RoHS in TI's official packaging addendum. This reflects its qualification for military and aerospace applications where Pb-free exemptions apply per JEDEC J-STD-609 Category 2. The SNJ54LS38J remains fully compliant with MIL-PRF-38535 Class B requirements.

Can the SNJ54LS38J be used as a direct replacement for SN5438J in existing designs?

Yes, the SNJ54LS38J is functionally and pin-compatible with SN5438J, sharing identical CDIP-14 packaging, pinout, and electrical specifications - but with LS-series improvements: lower power consumption (19 mA typical I_CC vs. 34 mA for SN5438J) and faster propagation delay (25 ns typical vs. 30 ns). No PCB changes are required; however, verify timing margins due to reduced t_PD. The SNJ54LS38J retains full backward compatibility with SN5438J-based systems.

What is the meaning of the 'J' suffix in SNJ54LS38J?

The 'J' suffix in SNJ54LS38J denotes the Ceramic Dual-In-Line Package (CDIP) variant with 14 leads, per TI's standard package coding. It indicates a hermetically sealed ceramic body with glass-frit lid, rated for military temperature range (–55°C to +125°C), and intended for high-reliability applications. This distinguishes it from plastic packages (e.g., 'N' for PDIP) or surface-mount variants (e.g., 'D' for SOIC). The SNJ54LS38J meets MIL-STD-883 test requirements for this package type.

SNJ54LS38J Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LS

Package/Case:: 14-CDIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Logic Type:: NAND Gate

Number of Circuits:: 4

Number of Inputs:: 2

Features:: Open Collector

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Max):: 12 mA

Current - Output High, Low:: -, 12mA

Input Logic Level - Low:: 0.7V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 32ns @ 5V, 45pF

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-CDIP

SNJ54LS38J FAQ

1.How can I place an order for SNJ54LS38J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54LS38J 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 SNJ54LS38J reliable?

The price and inventory of SNJ54LS38J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS38J is usually 5 days.

3.What payment methods are accepted for SNJ54LS38J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS38J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54LS38J?

SNJ54LS38J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54LS38J 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 SNJ54LS38J?

For technical support, including SNJ54LS38J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS38J requirements.

6.How does Aetrix verify that SNJ54LS38J is sourced from the original manufacturer or authorized distributors?

All SNJ54LS38J 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 SNJ54LS38J meets industry standards.

7.What is the process for return or replacement of SNJ54LS38J?

All SNJ54LS38J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS38J, 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 SNJ54LS38J part is unused and in its original packaging.

Return procedure for SNJ54LS38J:

1.Submit a request within 90 days.

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

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