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HomeProductsIntegrated Circuits (ICs)Logic - Buffers, Drivers, Receivers, TransceiversSNJ54LS540J
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SNJ54LS540J - Texas Instruments

Manufacturer Part Number
SNJ54LS540J
Manufacturer
Texas Instruments
Allelco Part Number
32D-SNJ54LS540J
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,840 pcs available, New & Original
Parts Description
54LS540 OCTAL BUFFERS AND LINE D
Package
Bulk
Data sheet
SNJ54LS540J.pdf

Datasheets

Datasheet.pdf

HTML Datasheet

Datasheet.pdf
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Specifications

SNJ54LS540J Tech Specifications
Texas Instruments - SNJ54LS540J technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SNJ54LS540J

Product Attribute Attribute Value
Manufacturer Texas Instruments
Series *
Product Attribute Attribute Value
Package Bulk
Base Product Number 54LS540

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

SNJ54LS540J Image
SNJ54LS540J (1)

Manufacturer Part Number

SNJ54LS540J

Manufacturer

Texas Instruments

Introduction

High-performance logic buffer with Schmitt-trigger inputs and 3-state outputs designed for digital signal processing.

Product Features and Performance

Inverting buffer logic function

Eight-bit wide buffer with Schmitt-trigger inputs

Three-state outputs for bidirectional bus applications

High current output capability for driving multiple loads

Robust operating temperature range suitable for industrial applications

Product Advantages

Compatible with multiple supply voltages

Suitable for harsh operating environments due to wide temperature range

Direct interface capability with a wide range of microprocessors and digital systems

Reduced signal reflection with Schmitt-trigger inputs

Key Technical Parameters

Logic Type: Buffer, Inverting

Number of Elements: 1

Number of Bits per Element: 8

Input Type: Schmitt Trigger

Output Type: 3-State

Current - Output High, Low: 12mA

Voltage - Supply: 4.5V ~ 5.5V

Operating Temperature: -55°C ~ 125°C

Quality and Safety Features

Built to military specifications for high reliability

Tested over an extensive temperature range ensuring stable performance

Compliance with environmental standards and regulations

Compatibility

Interface compatible with a broad range of digital circuitry

Through-hole mounting design for general-purpose PCB applications

Application Areas

Military and aerospace technology

Industrial and automation systems

Digital signal processing

Complex logic circuits

Communication infrastructure

Product Lifecycle

Active status indicating current production with ongoing manufacturer support

Availability of replacement or upgrades may vary, consult manufacturer for lifecycle updates

Several Key Reasons to Choose This Product

Reliable high-speed operation suitable for critical applications

Durable design optimized for demanding operational conditions

Proven technology from Texas Instruments, a leading semiconductor manufacturer

Efficient interfacing with logic systems without need for additional components

Robust construction for long-term deployment in a variety of systems

Frequently Asked Questions(FAQ)

How does the SNJ54LS540J handle signal integrity in high-speed digital systems operating near its maximum temperature range of 125°C?
The SNJ54LS540J maintains reliable signal integrity across its full operating temperature span due to its Schmitt Trigger inputs, which provide hysteresis that reduces noise susceptibility and ensures clean transitions even as ambient temperatures approach 125°C. This characteristic is particularly valuable in military or industrial environments where thermal cycling and elevated operating conditions are common. The 3-state outputs further support bus architecture designs by preventing data corruption during contention periods, while the consistent propagation delay performance across temperature ensures predictable timing behavior in clocked systems.
What are the key differences between the SNJ54LS540J and standard commercial-grade LS-series buffers like the SN74LS540N in terms of reliability and application suitability?
The SNJ54LS540J is a military-grade variant designed for extended reliability under harsh conditions, with tighter manufacturing controls and enhanced screening compared to the SN74LS540N. While both devices share identical electrical characteristics—including 8-bit inverting buffers with Schmitt-trigger inputs and 3-state outputs—the SNJ54LS540J operates across a wider temperature range (-55°C to 125°C) and meets stricter environmental testing standards. This makes it suitable for aerospace and defense applications where long-term stability and fault tolerance are critical, whereas the commercial-grade part is optimized for cost-sensitive consumer or industrial electronics within more moderate thermal envelopes.
Can the SNJ54LS540J be used safely in 5V systems without additional level-shifting circuitry?
Yes, the SNJ54LS540J supports operation from 4.5V to 5.5V directly, making it fully compatible with standard 5V TTL logic systems. Its input thresholds are compatible with 5V logic families, and the Schmitt Trigger design ensures robust noise immunity even at supply voltages at the lower end of this range. No external level translation is required when interfacing between 5V logic stages, simplifying board layout and reducing component count in legacy or embedded system designs.
What impact does enabling the three-state output feature have on power consumption in the SNJ54LS540J during typical bus-based communication protocols?
When the output enable (OE) pin is asserted, the SNJ54LS540J draws approximately 12mA sink/source current per channel under active drive conditions. However, when OE is deasserted, the outputs enter a high-impedance state, effectively isolating the device from the bus. In such states, quiescent current drops significantly—typically below microamps—reducing overall power dissipation during idle periods. This dynamic power management is essential in multi-device bus architectures like I²C or parallel memory interfaces, where multiple drivers contend for shared lines.
How should PCB layout considerations differ when mounting the SNJ54LS540J in a through-hole design versus surface-mount alternatives?
Although the SNJ54LS540J uses a 20-CDIP package intended for through-hole mounting, proper thermal relief and trace spacing must be observed due to its relatively large footprint (0.300", 7.62mm). Signal traces connected to Schmitt-trigger inputs should avoid coupling with noisy lines to preserve transition clarity, especially over long runs. Decoupling capacitors should be placed close to the VCC and GND pins to suppress supply transients. While not MSL-rated, handling care is still necessary during wave soldering due to potential lead warpage.
Is the SNJ54LS540J suitable for use in automotive applications requiring AEC-Q100 qualification?
No, the SNJ54LS540J is classified as a military-grade component and does not carry AEC-Q100 certification. While its extended temperature range (-55°C to 125°C) overlaps with some automotive requirements, automotive-specific qualifications involve rigorous reliability testing beyond standard MIL-STD parameters. For automotive use cases, engineers should select components explicitly qualified to AEC-Q100 Grade 2 (up to 125°C) or higher, ensuring compliance with industry-specific failure modes and stress tests.
What are the implications of using the SNJ54LS540J in a daisy-chained configuration across multiple clock domains?
Daisy-chaining the SNJ54LS540J across asynchronous clock domains introduces significant risk of metastability due to asynchronous input signals crossing clock boundaries. Although the Schmitt Trigger improves noise margins and glitch filtering, it does not resolve timing synchronization issues. Without careful handshake protocols or FIFO buffering, data may become corrupted. Therefore, such configurations require either synchronous clocking throughout the chain or intermediate synchronizer circuits to prevent race conditions and ensure reliable operation.
How does the propagation delay variation of the SNJ54LS540J compare across its supply voltage range, and what engineering trade-offs does this present?
The SNJ54LS540J exhibits slightly increased propagation delay as supply voltage decreases from 5.5V toward 4.5V due to reduced internal transistor switching speeds. While exact values depend on load capacitance and fan-out, typical delays range from 15ns to 25ns under standard conditions. Designers must balance power savings against timing budgets—using lower voltages can extend battery life but may compromise speed in high-throughput applications. This trade-off necessitates margin analysis in real-time systems where worst-case timing must be guaranteed across all operating points.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SNJ54LS540J

Product Attribute SNJ54LS540J SNJ54LS541W SNJ54LS592FK SNJ54LS593FK
Part Number SNJ54LS540J SNJ54LS541W SNJ54LS592FK SNJ54LS593FK
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Base Product Number 54LS540 54LS541 54LS592 54LS593
Series * * * *
Package Bulk Bulk Bulk Bulk

SNJ54LS540J Datasheet PDF

Download SNJ54LS540J pdf datasheets and Texas Instruments documentation for SNJ54LS540J - Texas Instruments.

Datasheets
Datasheet.pdf
HTML Datasheet
Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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SNJ54LS540J Image

SNJ54LS540J

Texas Instruments
32D-SNJ54LS540J

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