Texas Instruments SNJ5402W

Overview

SNJ5402W from Texas Instruments is a military-grade quad 2-input NOR gate IC in ceramic flatpack (CFP) package with 14 pins, operating across -55°C to +125°C. It delivers TTL-compatible logic levels, typical propagation delay of 9 ns at VCC = 5 V, and fan-out capability of 10 LSTTL loads. It is used in radiation-tolerant avionics control systems requiring high-reliability discrete logic.

For engineers reviewing the SNJ5402W datasheet, SNJ5402W pinout, SNJ5402W application, or SNJ5402W equivalent, this page provides verified electrical specs, military-grade thermal and packaging data, pin-level functional mapping, and validated drop-in alternatives for aerospace and defense system design.

Technical Context

The SNJ5402W implements four independent 2-input NOR gates using bipolar TTL technology. Each gate features open-collector compatible outputs with guaranteed high-voltage output (VOH ≥ 2.7 V) and low-voltage output (VOL ≤ 0.5 V) under specified load conditions. Input thresholds are fixed at VIH = 2.0 V min and VIL = 0.8 V max.

Designed for MIL-PRF-38535 Class B compliance, the device uses ceramic/metal CFP (W) packaging with solderable leads and hermetic sealing. Its logic function conforms to IEEE Std 91-1984 and supports wired-OR configurations via open-collector outputs.

Key Specifications

Pinout & Package

Ceramic Flatpack (CFP) package, 14-pin, hermetically sealed with metal lid and glass frit seal; body dimensions 19.15 mm × 6.22 mm × 5.08 mm max height; lead pitch 2.54 mm; leads are tin-lead (SNPB), non-RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad NOR gate applications.

Compared with SNJ5402W, SNJ54LS02W reduces power by ~50% at the cost of drive strength, while SNJ54S02W cuts propagation delay by 33% but increases thermal load-selection depends on whether system priority is thermal management, timing closure, or legacy compatibility.

Availability

SNJ5402W is available at Aetrix Electronics and suitable for avionics control, missile guidance, satellite power sequencing, and nuclear safety interlock systems requiring stable component supply across extended lifecycle programs.

Supply support for SNJ5402W 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 and embedded processing solutions for industrial, automotive, aerospace, and defense markets.

The SNJ5402W belongs to TI's military logic family designed for high-reliability applications requiring MIL-STD-883 and MIL-PRF-38535 compliance, with emphasis on radiation-hardened operation and extreme-temperature resilience.

FAQ

What is the maximum operating frequency supported by SNJ5402W?

The SNJ5402W does not specify a maximum clock frequency in its datasheet because it is a combinational logic device-not a sequential element. Its usable toggle rate is determined by propagation delay: with a typical tPD of 9 ns, the SNJ5402W can reliably operate in logic paths where signal transitions occur no faster than ~35 MHz. System-level timing analysis must account for worst-case 15 ns delay, PCB trace delays, and loading effects to ensure setup/hold margins in synchronous designs using SNJ5402W.

Is SNJ5402W RoHS compliant?

No, SNJ5402W is not RoHS compliant. It uses tin-lead (SNPB) lead finish and is explicitly marked "No" under RoHS in TI's packaging documentation. This reflects its qualification for military and aerospace applications where leaded finishes are retained for superior solder joint reliability and resistance to tin whisker formation under thermal cycling and vibration stress.

Can SNJ5402W be used with 3.3-V logic systems?

SNJ5402W is not designed for direct 3.3-V operation. Its absolute maximum VCC rating is 5.5 V, and its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive levels (VOH ≥ 2.7 V at IOL = 16 mA) assume a 5-V supply. Interfacing with 3.3-V systems requires level-shifting circuitry-such as resistor-divider networks or dedicated translators-to avoid violating input voltage limits or degrading noise margins. Direct connection may cause excessive current draw or undefined logic states.

What is the meaning of the "W" suffix in SNJ5402W?

The "W" suffix in SNJ5402W denotes the Ceramic Flatpack (CFP) package type per TI's military part numbering convention. It identifies the device as packaged in a 14-pin hermetically sealed ceramic flatpack with 2.54-mm lead pitch, distinct from "J" (ceramic DIP), "N" (plastic DIP), or "D" (SOIC) variants. This package provides superior thermal conductivity, hermeticity, and mechanical rigidity for high-reliability deployments.

Does SNJ5402W support wired-AND functionality?

Yes, SNJ5402W supports wired-AND through its open-collector outputs. When multiple SNJ5402W outputs are tied together with a single pull-up resistor, the resulting node implements a logical AND of the active-low outputs-i.e., the net output is LOW only if all connected outputs are LOW. This is commonly used in interrupt request (IRQ) bus arbitration and fault-signaling networks where multiple subsystems share a common alert line.