Texas Instruments SNJ54AHC574W

Overview

SNJ54AHC574W from Texas Instruments is a military-grade octal edge-triggered D-type flip-flop with 3-state outputs, operating from 2 V to 5.5 V, featuring ±25 mA output drive per channel, 2000 V HBM ESD rating, and –55°C to +125°C temperature range. It serves as a bus-interface register in high-reliability data acquisition and control systems.

For engineers reviewing the SNJ54AHC574W datasheet, SNJ54AHC574W pinout, SNJ54AHC574W application, or SNJ54AHC574W equivalent, key selection criteria include its CFP-20 package, MIL-PRF-38535 compliance, latch-up immunity (>250 mA), 3-state output timing (tPLH/tPHL ≤11 ns at 5 V), and compatibility with 3.3 V/5 V mixed-voltage bus architectures.

Technical Context

The SNJ54AHC574W implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its CMOS AHC logic family ensures low static current (ICC ≤40 µA) and rail-to-rail output swing (VOH ≥4.4 V at VCC = 4.5 V, VOL ≤0.1 V).

Designed for military and aerospace applications, it supports full parametric testing per MIL-PRF-38535, includes JESD17 latch-up immunity, and operates reliably under extreme thermal stress (RθJA = 53.3°C/W in DW package). Input tolerance up to 5.5 V enables 5 V → 3.3 V level translation without external circuitry.

Key Specifications

Pinout & Package

SNJ54AHC574W uses a 20-pin Ceramic Flatpack (CFP) package with 0.050″ lead pitch, hermetically sealed for high-reliability mil-aero use. Body size is 12.8 mm × 10.3 mm; total package footprint includes leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74AHC574DW, SNJ54AHC574W delivers guaranteed parametric testing, hermetic sealing, and extended temperature validation-critical for mission-critical platforms. Against SNJ54ACT574W, it provides improved noise immunity and 60% lower static current, making it preferable for modern low-power avionics designs.

Availability

SNJ54AHC574W is available at Aetrix Electronics and suitable for avionics data acquisition, secure communications terminals, tactical vehicle control units, and missile guidance interfaces requiring stable component supply across extended product lifecycles.

Supply support for SNJ54AHC574W 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 for aerospace, defense, and industrial markets.

The SNJ54AHC574W belongs to TI's military logic portfolio, designed specifically for high-integrity digital interfacing in safety-critical systems where parameter stability, radiation tolerance, and long-term supply assurance are essential.

FAQ

What is the maximum clock frequency supported by SNJ54AHC574W?

The SNJ54AHC574W supports a maximum clock frequency of 75 MHz when driving a 50 pF load at VCC = 5 V, based on its specified propagation delay (tPLH/tPHL ≤11 ns) and minimum pulse width (tw ≥5 ns). This limit assumes proper layout, decoupling, and termination to maintain signal integrity across the full –55°C to +125°C operating range. The SNJ54AHC574W datasheet confirms fMAX = 75 MHz under these conditions.

Does SNJ54AHC574W require external pull-up resistors on its 3-state outputs?

No, SNJ54AHC574W does not require external pull-up resistors on its 3-state outputs. Its outputs enter true high-impedance (Z) state when OE is low, presenting >10⁹ Ω impedance - sufficient to prevent bus contention without passive termination. Pull-ups are only needed if a defined logic level is required during high-Z periods for system-level default behavior, which is application-specific and not inherent to SNJ54AHC574W functionality.

Is SNJ54AHC574W compatible with 3.3 V-only systems?

Yes, SNJ54AHC574W is fully compatible with 3.3 V-only systems: it operates down to VCC = 2 V, meets VIH/VIL thresholds for 3.3 V logic (VIH = 2.1 V min, VIL = 0.9 V max at VCC = 3 V), and delivers rail-aligned VOH/VOL (VOH ≥2.58 V, VOL ≤0.36 V at IO = ±4 mA). Its 5.5-V tolerant inputs also allow safe connection to 5 V signals without damage, making SNJ54AHC574W ideal for mixed-voltage board designs.

What packaging and marking information identifies SNJ54AHC574W?

SNJ54AHC574W is supplied in a 20-pin Ceramic Flatpack (CFP) package with part marking "5962-9685401QSA" and "SNJ54AHC574W" laser-etched on the top surface. The CFP body measures 12.8 mm × 10.3 mm; leads are tin-lead (SNPB) finished and non-RoHS compliant. It ships in tubes of 25 units and is qualified to MIL-PRF-38535 Class V standards - all verified on the official TI product folder for SNJ54AHC574W.

How does SNJ54AHC574W handle unused input pins?

Per TI's design guidance, all unused inputs of SNJ54AHC574W - including D inputs, CLK, and OE - must be tied to a valid logic level (VCC or GND) to prevent floating nodes that cause increased ICC, oscillation, or undefined output states. For example, unused D inputs should connect to GND or VCC depending on desired default latch value; OE must be held high to enable outputs or low to force high-Z. This requirement is explicitly stated in the SNJ54AHC574W datasheet Section 5.3 note and applies across the full temperature range.