Texas Instruments SNJ54HC368J

Overview

SNJ54HC368J from Texas Instruments is a military-grade hex inverting buffer and 3-state line driver IC designed for memory address bus driving, clock distribution, and bidirectional bus interfacing in high-reliability systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, features typical propagation delay of 10 ns (VCC = 4.5 V), and consumes ≤80 µA ICC max.

For engineers reviewing the SNJ54HC368J datasheet, SNJ54HC368J pinout, SNJ54HC368J application, or SNJ54HC368J equivalent, this page provides verified functional modes, thermal metrics for CDIP-16 packaging, 3-state enable timing (ten/tdis), input voltage thresholds across supply range, and validated alternatives for aerospace and defense designs requiring –55°C to +125°C operation.

Technical Context

The SNJ54HC368J implements dual independent 3-state buffer groups: one 4-line (A1–A4 → Y1–Y4) and one 2-line (A5–A6 → Y5–Y6), each with active-low output-enable (1OE, 2OE). Inversion occurs only on data path - OE logic is non-inverting.

It uses silicon-gate CMOS technology enabling TTL-compatible input thresholds, rail-to-rail output swing, and high noise immunity. The CDIP-16 package provides hermetic sealing and 68.6°C/W junction-to-ambient thermal resistance, supporting sustained operation under military temperature cycling and vibration profiles.

Key Specifications

Pinout & Package

SNJ54HC368J is housed in a 16-pin Ceramic Dual In-line Package (CDIP) measuring 24.38 mm × 6.92 mm with through-hole leads and hermetic ceramic body - suitable for high-reliability PCB mounting in aerospace, defense, and downhole instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SNJ54HC368J, SN74HC368N offers identical functionality at lower cost but lacks extended temperature and reliability validation, while SNJ54ACT368J trades CMOS input compatibility and low power for raw speed and TTL-level robustness - selection depends on whether environmental ruggedness, voltage flexibility, or propagation delay is the dominant design constraint.

Availability

SNJ54HC368J is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and downhole instrumentation requiring stable component supply across long product lifecycles and extreme environmental conditions.

Supply support for SNJ54HC368J 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 high-reliability logic solutions with over 50 years of aerospace and defense component heritage.

The SNJ54HC368J belongs to TI's military-qualified HC logic family, engineered for high-density, low-power 3-state bus interfacing in mission-critical systems where extended temperature operation and hermetic packaging are mandatory.

FAQ

What is the maximum operating temperature range for SNJ54HC368J?

The SNJ54HC368J is fully specified and tested from –55°C to +125°C per MIL-PRF-38535 requirements. This extended range is enabled by its hermetic CDIP package and process-controlled silicon, making it suitable for engine-mounted controllers, space-rated payloads, and other high-thermal-stress environments where commercial-grade variants would fail.

Does SNJ54HC368J support mixed-voltage interfacing between 3.3 V and 5 V logic domains?

Yes, SNJ54HC368J supports mixed-voltage operation: its input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and outputs swing rail-to-rail. When powered at 3.3 V, it reliably accepts 5 V-tolerant inputs via internal clamping diodes (rated ±20 mA), and when powered at 5 V, it drives 3.3 V CMOS inputs with guaranteed VOH > 3.84 V at 6 mA load.

How many independent 3-state control inputs does SNJ54HC368J provide?

The SNJ54HC368J provides two independent active-low 3-state enable inputs: 1OE controls outputs Y1–Y4, and 2OE controls outputs Y5–Y6. This dual-enable architecture allows selective gating of address sub-buses or time-multiplexed peripheral interfaces without requiring external logic to partition the enable signal.

What is the recommended bypass capacitor for SNJ54HC368J?

Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) and GND (Pin 13) of SNJ54HC368J. For high-noise environments, paralleling with a 1 µF tantalum or ceramic capacitor improves low-frequency decoupling. The CDIP package's lead inductance makes proximity critical - trace length should be ≤2 mm.

Is SNJ54HC368J pin-compatible with SN74HC368N?

Yes, SNJ54HC368J and SN74HC368N share identical pinout, logic function, and electrical behavior across their respective temperature ranges. Both use 16-pin DIP footprints (CDIP vs. PDIP), though mechanical dimensions differ slightly (24.38 × 6.92 mm vs. 19.31 × 6.35 mm). PCB layout must account for CDIP's wider body and longer leads, but no netlist or schematic changes are needed.