Texas Instruments SNJ54S258J

Overview

SNJ54S258J from Texas Instruments is a military-grade quadruple 2-line to 1-line data selector/multiplexer IC used for digital signal routing in high-reliability logic systems. It features four independent 2:1 multiplexers, TTL-compatible inputs/outputs, -55°C to +125°C operating temperature, and CDIP-16 package with through-hole mounting - deployed in avionics timing control, missile guidance interface logic, and radiation-tolerant test instrumentation.

For engineers reviewing the SNJ54S258J datasheet, SNJ54S258J pinout, SNJ54S258J application, or SNJ54S258J equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed military-spec performance boundaries, and direct alternative part comparisons for legacy system sustainment and obsolescence mitigation.

Technical Context

The SNJ54S258J implements four identical 2:1 data selectors sharing a common select (S) input and active-low enable (G̅) control. Each channel routes either I₀ or I₁ to its output Y based on S state when G̅ is low; all outputs are forced high-impedance when G̅ is high. Its Schottky-clamped TTL circuitry ensures fast propagation (t_pd = 5 ns typical at V_CC = 5 V), low power dissipation (I_CC = 34 mA max), and noise immunity suitable for mixed-signal board-level interconnects.

Designed for military applications, it meets MIL-PRF-38535 Class B requirements with 100% screening, hermetic CDIP (J) ceramic dual-in-line packaging, and guaranteed operation across -55°C to +125°C without derating. Input thresholds align with standard TTL logic families, enabling direct interfacing with SN54LS, SN54S, and compatible controllers without level-shifting.

Key Specifications

Pinout & Package

Ceramic Dual-In-Line Package (CDIP), 16-pin, through-hole, hermetically sealed, with 0.3-inch body width and 0.1-inch pin pitch. Pin 1 identified by notch or dot marking; pins arranged in two parallel rows.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar data selector/multiplexer applications.

Compared with SNJ54S258J, SNJ54LS258BJ trades speed for lower power and noise margin, while JM38510/30906BEA retains identical logic behavior but shifts to surface-mount LCCC for enhanced mechanical robustness and thermal performance in compact modules.

Availability

SNJ54S258J is available at Aetrix Electronics and suitable for avionics signal routing, missile guidance interface, and radiation-tolerant instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54S258J 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 SNJ54S258J belongs to TI's military-grade TTL logic family designed specifically for ruggedized digital control, real-time signal selection, and legacy system compatibility in mission-critical aerospace and defense platforms.

FAQ

What is the maximum clock frequency supported by SNJ54S258J?

The SNJ54S258J does not operate on a clock signal - it is a combinational logic device. Its usable data rate depends on propagation delay (5 ns typical) and system setup/hold timing. For clean 2:1 selection with minimal skew, it supports data transitions up to approximately 100 MHz in well-designed layouts with proper termination and decoupling. The SNJ54S258J remains stable under these conditions due to its Schottky-clamped TTL architecture and tight parameter guarantees across temperature.

Is SNJ54S258J RoHS compliant?

No, SNJ54S258J is not RoHS compliant. It uses leaded solder (SNPB finish) and is manufactured under MIL-PRF-38535 Class B specifications, which permit leaded terminations for hermetic ceramic packages. This makes SNJ54S258J suitable for high-reliability applications where lead-free compliance is secondary to long-term reliability and thermal cycling performance.

Can SNJ54S258J be used with 3.3 V logic systems?

No, SNJ54S258J requires a 4.5 V to 5.5 V supply and is not 3.3 V tolerant. Its input thresholds and output drive levels are specified only for 5 V TTL operation. Interfacing with 3.3 V systems requires level-shifting circuitry or a compatible 5 V supply domain. Using SNJ54S258J directly with 3.3 V logic risks undriven inputs, marginal noise margins, and potential damage over time.

What is the meaning of the "J" suffix in SNJ54S258J?

The "J" suffix in SNJ54S258J denotes the Ceramic Dual-In-Line Package (CDIP) variant - a hermetically sealed, through-hole 16-pin package with 0.3-inch width. This distinguishes it from "W" (CFP), "FK" (LCCC), and plastic "N" or "D" packages. The "J" package ensures long-term reliability in harsh environments and is standard for MIL-SPEC versions like SNJ54S258J.

How does SNJ54S258J differ from SN74S258N?

SNJ54S258J is the military-grade version with -55°C to +125°C operation, 100% screening, hermetic CDIP packaging, and MIL-PRF-38535 qualification. SN74S258N is the commercial version: PDIP package, 0°C to +70°C range, no screening, and lower cost. Both share identical logic function and DC/AC specs within their respective temperature ranges, but SNJ54S258J is required for defense, aerospace, and extended-environment applications where SN74S258N would fail prematurely.