Texas Instruments SNJ54LVC374AFK

Overview

SNJ54LVC374AFK from Texas Instruments is a military-grade octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2.7-V to 3.6-V V_CC operation. It features 8 independent D-flip-flop channels, clock-controlled positive-edge latching, output-enable (OE) control, and 5.5-V tolerant inputs - enabling mixed-voltage interfacing in ruggedized systems such as aerospace data buses and defense avionics.

For engineers reviewing the SNJ54LVC374AFK datasheet, SNJ54LVC374AFK pinout, SNJ54LVC374AFK application, or SNJ54LVC374AFK equivalent, key selection criteria include its –55°C to 125°C operating range, 6.5 ns max t_pd at 3.3 V, I_off support for live insertion, and LCCC (FK) package compatibility with high-reliability board-level hermetic sealing.

Technical Context

This device implements eight synchronous D-type latches with a common clock (CLK) and shared 3-state output enable (OE). Each Q output reflects the corresponding D input on the rising edge of CLK, while OE independently places all outputs in high-impedance mode without affecting internal state retention.

It supports mixed-mode signal operation: inputs tolerate up to 5.5 V regardless of V_CC (1.65–3.6 V), enabling translation from 5-V logic to 3.3-V domains. The I_off feature disables outputs and blocks current backflow when V_CC = 0 V, supporting partial-power-down and hot-swap scenarios.

Key Specifications

Pinout & Package

LCCC (FK) package: 20-terminal ceramic leadless chip carrier, hermetically sealed, lead-free SNPB finish, no moisture sensitivity level (MSL N/A), body size 8.89 mm × 8.89 mm × 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SNJ54LVC374AFK, SN74LVC374APWR lacks military temperature rating and hermetic packaging but offers lower cost and surface-mount flexibility, while 5962-9757401QRA delivers identical reliability in a through-hole form factor suited for repairable chassis-mounted systems.

Availability

SNJ54LVC374AFK is available at Aetrix Electronics and suitable for aerospace data acquisition, defense radar interface, avionics display drivers, and tactical radio baseband applications requiring stable component supply across extended temperature and long lifecycle commitments.

Supply support for SNJ54LVC374AFK 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 with over 50 years of analog and logic innovation, serving aerospace, defense, industrial, and automotive markets with high-reliability components.

SNJ54LVC374AFK belongs to TI's military logic portfolio, engineered specifically for high-integrity digital interfacing in safety-critical platforms where extended temperature operation, hermetic packaging, and MIL-STD-883 compliance are mandatory.

FAQ

What is the maximum clock frequency supported by SNJ54LVC374AFK?

The SNJ54LVC374AFK supports a maximum clock frequency of 100 MHz at V_CC = 3.3 V and TA = 25°C. At full military temperature range (–55°C to 125°C), timing characterization confirms reliable operation up to 80 MHz per SN54LVC374A specifications. This makes SNJ54LVC374AFK suitable for high-speed data capture in telemetry and radar subsystems where deterministic timing is essential.

Does SNJ54LVC374AFK support 1.8-V operation?

No, SNJ54LVC374AFK is specified only for 2.7-V to 3.6-V V_CC operation per its SN54LVC374A designation. Unlike the commercial SN74LVC374A variant, it is not characterized or guaranteed below 2.7 V. Attempting 1.8-V operation may result in undefined logic states, increased propagation delay, or failure to meet setup/hold timing - use SN74LVC374A variants for sub-2.7-V applications.

Can SNJ54LVC374AFK be used as a level shifter between 5-V and 3.3-V systems?

Yes, SNJ54LVC374AFK accepts input voltages up to 5.5 V regardless of V_CC (2.7–3.6 V), making it suitable for translating 5-V logic signals down to 3.3-V domains. Its outputs swing rail-to-rail between GND and V_CC, so external pull-ups are unnecessary. However, it does not translate upward - 3.3-V inputs cannot drive 5-V loads without additional buffering.

What is the purpose of the I_off feature in SNJ54LVC374AFK?

The I_off feature in SNJ54LVC374AFK disables all outputs and blocks current flow when V_CC = 0 V, preventing back-driving of powered circuitry during hot insertion or partial power-down. This protects upstream 5-V sources and downstream 3.3-V receivers in modular avionics systems, satisfying MIL-STD-1553B and ARINC 429 interface robustness requirements.

Is SNJ54LVC374AFK pin-compatible with other LCCC-20 logic devices?

SNJ54LVC374AFK uses standard LCCC-20 mechanical dimensions (8.89 mm × 8.89 mm) and pinout per TI's FK package drawing, ensuring physical compatibility with LCCC sockets and footprints used for other 20-terminal logic ICs. However, electrical functionality (e.g., clock edge, output enable polarity, drive strength) differs from non-LVC families - verify logic mapping before substitution.