Texas Instruments SNJ54LS241FK

Overview

SNJ54LS241FK from Texas Instruments is a military-grade octal non-inverting 3-state line driver with dual independent 4-bit channels, designed for high-reliability bus interfacing in aerospace and defense systems. It features PNP inputs (reducing DC loading), input hysteresis (400-mV noise margin), 15 ns max propagation delay at 5 V, and operates across –55°C to +125°C. It drives terminated lines down to 133 Ω in memory address and clock distribution applications.

For engineers reviewing the SNJ54LS241FK datasheet, SNJ54LS241FK pinout, SNJ54LS241FK application, or SNJ54LS241FK equivalent, key selection criteria include its LCCC-20 (FK) hermetic package, dual-channel 3-state enable control (1G/2G), compatibility with 3.3-V/5-V mixed logic, and MIL-PRF-38535 compliance for radiation-hardened environments.

Technical Context

The SNJ54LS241FK implements two independent 4-bit non-inverting buffer sections, each with active-low output-enable (1G and 2G). When an enable input is low, corresponding Y outputs replicate A-side inputs; when high, outputs enter high-impedance state. Inputs tolerate down to 2 V and exhibit hysteresis for robust noise immunity.

It uses Schottky TTL (LS) logic with PNP input stages to minimize bus loading. All parameters are tested per MIL-PRF-38535 requirements, including absolute maximum ratings (VCC ≤ 7 V, VI ≤ 7 V), ESD tolerance (500-V HBM), and thermal performance (RθJA = 50.6°C/W in PDIP-equivalent test condition).

Key Specifications

Pinout & Package

LCCC-20 (FK) package: 8.89 mm × 8.89 mm ceramic leadless chip carrier with solderable metallized terminations; suitable for high-reliability, high-vibration, and hermetic sealing requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.

Compared with SNJ54LS244FK and SNJ54S241FK, SNJ54LS241FK uniquely balances low power (46 mA max ICC), dual-channel independence, and MIL-qualified reliability-making it optimal for fault-isolated, thermally constrained, multi-bus military systems.

Availability

SNJ54LS241FK is available at Aetrix Electronics and suitable for aerospace data bus interface, avionics memory address buffering, and defense system clock distribution requiring stable component supply across extended temperature and radiation-hardened environments.

Supply support for SNJ54LS241FK 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and aerospace markets.

The SNJ54LS241FK belongs to TI's military-grade logic family designed specifically for high-reliability bus interfacing in aerospace, defense, and space applications where extended temperature range, hermetic packaging, and MIL-PRF-38535 compliance are mandatory.

FAQ

What is the operating temperature range for SNJ54LS241FK?

The SNJ54LS241FK is rated for operation from –55°C to +125°C, meeting MIL-PRF-38535 Class B requirements. This full military temperature range is validated across all electrical parameters-including propagation delay, output drive, and noise margin-and makes SNJ54LS241FK suitable for deployment in jet engine bays, satellite payloads, and ground vehicle electronics exposed to extreme thermal cycling.

Does SNJ54LS241FK support 3.3-V logic inputs?

Yes, SNJ54LS241FK accepts 3.3-V logic inputs directly due to its input tolerance down to 2 V and compatibility with 3.3-V or 2.5-V logic families. This eliminates the need for external level shifters in mixed-voltage systems, such as interfacing modern FPGAs to legacy 5-V bus architectures-a capability confirmed in TI's SDLS144D datasheet Section 1 and Feature list.

How does the dual output-enable architecture of SNJ54LS241FK improve system design?

The SNJ54LS241FK provides two independent active-low output-enable inputs (1G and 2G), allowing separate control of its two 4-bit channel groups. This enables precise bus arbitration-for example, holding one channel in high-Z while driving the other-critical in time-triggered avionics networks where deterministic access to shared resources must be guaranteed without software overhead.

What package type is used for SNJ54LS241FK and why is it significant?

SNJ54LS241FK uses the LCCC-20 (FK) package: an 8.89 mm × 8.89 mm hermetically sealed ceramic leadless chip carrier. Its significance lies in superior moisture resistance, thermal stability, and mechanical robustness-key for aerospace and defense applications subject to humidity, vibration, and thermal shock where plastic packages would risk delamination or parameter drift.

Can SNJ54LS241FK drive terminated transmission lines, and if so, what is the minimum impedance?

Yes, SNJ54LS241FK can drive terminated transmission lines down to 133 Ω, as explicitly stated in the TI SDLS144D datasheet Applications section and Description. This capability stems from its 12 mA minimum sink current (IOL) and low output impedance, enabling reliable signal integrity over longer PCB traces common in backplane and chassis-level interconnects in military computing systems.