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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SNJ54F374FK

Name: SNJ54F374FK
Brand: Texas Instruments
SKU: SNJ54F374FK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54F374FK

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54F374FK.pdf

Description:: 54F374 OCTAL EDGE-TRIGGERED D-TY

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Product details

Overview

SNJ54F374FK from Texas Instruments is a military-grade 8-bit edge-triggered D-type flip-flop with 3-state bus-driver outputs, designed for high-capacitance load driving in aerospace and defense systems. It operates across −55°C to 125°C, features buffered OE and CLK inputs, supports 100 MHz max clock frequency, and delivers ±40 mA output drive capability.

For engineers reviewing the SNJ54F374FK datasheet, SNJ54F374FK pinout, SNJ54F374FK application, or SNJ54F374FK equivalent, this page provides verified functional specifications, LCCC-20 package layout, bus-interface timing behavior, and qualified military alternatives aligned with MIL-PRF-38535 Class B requirements.

Technical Context

The SNJ54F374FK implements eight independent D-type latches triggered on the positive edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its internal logic retains stored data regardless of OE state, enabling concurrent register update and bus isolation.

Designed for high-noise, wide-temperature environments, it uses TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), guarantees tPLH/tPHL ≤ 8.5 ns at VCC = 5 V, and maintains output leakage < ±50 µA in high-impedance mode - critical for fault-tolerant backplane and avionics data bus architectures.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	F-series TTL - ensures compatibility with legacy 5 V digital systems and predictable noise margins in mixed-signal avionics subsystems.
Operating Temperature	−55°C to 125°C - qualified per MIL-PRF-38535 Class B for deployment in engine control units, radar signal processors, and space-qualified payloads.
Max Clock Frequency	100 MHz - enables real-time sampling and buffering of high-speed telemetry streams without pipeline stalls.
Output Drive	±40 mA per output - sufficient to directly drive terminated 50 Ω transmission lines or multiple CMOS/TTL loads without external buffers.
Propagation Delay	tPLH/tPHL ≤ 8.5 ns (VCC = 5 V, CL = 50 pF) - supports tight setup/hold timing budgets in synchronous bus arbitration logic.
3-State Enable Delay	tPZH ≤ 11.5 ns, tPLZ ≤ 5.5 ns - ensures rapid bus release during dynamic reconfiguration, minimizing contention windows in time-critical I/O multiplexing.

Pinout & Package

LCCC (Leadless Ceramic Chip Carrier) package, 20-terminal, hermetically sealed, 8.89 mm × 8.89 mm footprint, 1.27 mm pitch, 2.03 mm max height - optimized for high-reliability PCB mounting in vibration-prone military platforms.

Pin/Terminal	Circuit Role	Design Meaning
1D–8D (Pins 1, 3–4, 7–8, 13–14, 17–18)	Data inputs	Asynchronous parallel data loading path; each tied to corresponding Q output; accepts standard TTL logic levels.
1Q–8Q (Pins 2, 5–6, 9, 12, 15–16, 19)	True buffered outputs	3-state capable; driven only when OE = LOW; high-drive strength supports direct bus connection without pull-ups.
CLK (Pin 11)	Clock input	Positive-edge-triggered master clock; synchronizes all eight flip-flops simultaneously; Schmitt-triggered for noise immunity.
OE (Pin 10)	Output enable	Active-low control; places all Q outputs in high-Z state without affecting internal latch state or CLK sensitivity.
VCC (Pin 20)	Power supply	+4.5 V to +5.5 V operation; decoupling required within 10 mm due to fast transient current demands.
GND (Pin 10)	Ground reference	Common return for logic and output drivers; must be low-inductance connection to minimize ground bounce in multi-channel switching.

Key Features

Feature	Design Value
Full military temperature range	Qualified from −55°C to 125°C per MIL-PRF-38535 - eliminates derating concerns in jet engine bays or satellite thermal extremes.
Edge-triggered D-latch architecture	Single-cycle data capture on CLK rising edge - enables deterministic timing in synchronous FIFO and register-file implementations.
Independent OE control	OE does not affect internal storage - allows background register updates while maintaining bus isolation during read-modify-write sequences.
High-current 3-state outputs	40 mA sink/source per output - drives terminated buses or fan-out >10 TTL loads without external drivers, reducing component count.
Buffered control inputs	CLK and OE inputs include input buffers - improves noise rejection and reduces capacitive loading on upstream logic in dense layouts.

Applications

Avionics Data Bus Interface	Radar Signal Processing Buffer
Use Scenario: Interfacing ADC/DAC modules to ARINC 429 or MIL-STD-1553B bus controllers in flight control computers. IC Role / Device Role / Timing Role: Synchronizes sampled sensor data into a deterministic timing domain and isolates bus segments during arbitration cycles. Use Value: Eliminates need for discrete bus transceivers and level shifters; 100 MHz clock tolerance supports oversampling rates up to 40 MSPS.	Use Scenario: Capturing and staging pulse-Doppler IF samples prior to FFT processing in airborne radar front ends. IC Role / Device Role / Timing Role: Acts as a high-speed input register bank, capturing parallel 12-bit words synchronized to system clock and holding data until DMA transfer. Use Value: ±40 mA drive ensures clean signal integrity across 15 cm backplane traces; tPLH ≤ 8.5 ns enables sub-10 ns sampling jitter control.
Secure Communication Crypto Module	Tactical Vehicle Control Unit
Use Scenario: Managing key schedule registers and round-data latches in hardware AES engines deployed in encrypted radio modems. IC Role / Device Role / Timing Role: Provides tamper-resistant storage for intermediate cipher states with simultaneous bus isolation during cryptographic key rotation. Use Value: Military temp rating ensures stable operation inside armored vehicle RF enclosures; OE-controlled high-Z prevents side-channel leakage during key wipe operations.	Use Scenario: Buffering CAN and discrete I/O signals between microcontroller and ruggedized actuator interfaces in tracked combat vehicles. IC Role / Device Role / Timing Role: Serves as programmable I/O port expander with glitch-free state retention during power sequencing or reset propagation delays. Use Value: −55°C to 125°C operation avoids thermal shutdown in desert or arctic deployments; LCCC package withstands 20 g mechanical shock per MIL-STD-810.

Avionics Data Bus Interface

Radar Signal Processing Buffer

Use Scenario: Interfacing ADC/DAC modules to ARINC 429 or MIL-STD-1553B bus controllers in flight control computers.

IC Role / Device Role / Timing Role: Synchronizes sampled sensor data into a deterministic timing domain and isolates bus segments during arbitration cycles.

Use Value: Eliminates need for discrete bus transceivers and level shifters; 100 MHz clock tolerance supports oversampling rates up to 40 MSPS.

Use Scenario: Capturing and staging pulse-Doppler IF samples prior to FFT processing in airborne radar front ends.

IC Role / Device Role / Timing Role: Acts as a high-speed input register bank, capturing parallel 12-bit words synchronized to system clock and holding data until DMA transfer.

Use Value: ±40 mA drive ensures clean signal integrity across 15 cm backplane traces; tPLH ≤ 8.5 ns enables sub-10 ns sampling jitter control.

Secure Communication Crypto Module

Tactical Vehicle Control Unit

Use Scenario: Managing key schedule registers and round-data latches in hardware AES engines deployed in encrypted radio modems.

IC Role / Device Role / Timing Role: Provides tamper-resistant storage for intermediate cipher states with simultaneous bus isolation during cryptographic key rotation.

Use Value: Military temp rating ensures stable operation inside armored vehicle RF enclosures; OE-controlled high-Z prevents side-channel leakage during key wipe operations.

Use Scenario: Buffering CAN and discrete I/O signals between microcontroller and ruggedized actuator interfaces in tracked combat vehicles.

IC Role / Device Role / Timing Role: Serves as programmable I/O port expander with glitch-free state retention during power sequencing or reset propagation delays.

Use Value: −55°C to 125°C operation avoids thermal shutdown in desert or arctic deployments; LCCC package withstands 20 g mechanical shock per MIL-STD-810.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit D-type latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS374FK	Lower drive (24 mA), slower speed (fmax = 40 MHz), reduced power (ICCZ = 35 mA vs. 86 mA)	Better suited for low-power, lower-bandwidth legacy systems where thermal budget is constrained	Select when system clock ≤ 30 MHz and total supply current must stay below 100 mA
5962-9759001QRA	Same F-family specs but CDIP-20 package; larger footprint (24.2 mm × 6.9 mm vs. LCCC's 8.9 mm × 8.9 mm); identical electrical behavior	Preferred for through-hole prototyping or legacy board rework where LCCC reflow capability is unavailable	Choose for manual assembly, test fixtures, or backward-compatible upgrades where PCB real estate is not constrained

Compared with SNJ54F374FK, SNJ54LS374FK trades speed and drive for lower static/dynamic power, while 5962-9759001QRA offers identical functionality in a through-hole package - enabling design reuse without logic redesign but requiring board-level mechanical adaptation.

Availability

SNJ54F374FK is available at Aetrix Electronics and suitable for avionics data acquisition, radar signal buffering, secure crypto module development, and tactical vehicle control systems requiring stable component supply under extended temperature and long lifecycle commitments.

Supply support for SNJ54F374FK 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 60 years of analog and logic innovation, delivering high-reliability components for aerospace, defense, and industrial markets.

The SNJ54F374FK belongs to TI's military-grade F-series TTL logic family, engineered specifically for deterministic timing, high-noise immunity, and extreme environmental resilience in mission-critical embedded control systems.

FAQ

What is the maximum clock frequency supported by SNJ54F374FK?

The SNJ54F374FK supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification is guaranteed across the full military temperature range (−55°C to 125°C) per its characterization data, making SNJ54F374FK suitable for high-speed data capture in radar and telemetry applications where timing predictability is essential.

Does SNJ54F374FK require external pull-up resistors on its outputs?

No, SNJ54F374FK does not require external pull-up resistors on its outputs. Its 3-state outputs provide active high and low drive (±40 mA) and enter true high-impedance when OE is HIGH, eliminating bus contention without passive termination. This feature is confirmed in the functional description and electrical characteristics tables of the SDFS077A datasheet for SNJ54F374FK.

Is SNJ54F374FK RoHS compliant?

SNJ54F374FK is not RoHS compliant, as indicated in TI's Package Option Addendum: lead finish is SNPB (tin-lead), and RoHS status is marked "No". It is manufactured to MIL-PRF-38535 Class B standards and intended for applications where legacy Pb-based soldering processes or reliability under thermal cycling are prioritized over RoHS compliance.

How does the output enable (OE) function interact with internal latch state in SNJ54F374FK?

In SNJ54F374FK, the OE input affects only output driver state - not internal flip-flop operation. When OE is HIGH, all Q outputs go high-impedance, but stored data remains intact and continues to respond to CLK transitions. This allows concurrent register updates and bus isolation, a behavior explicitly documented in the device description and function table of the SDFS077A datasheet.

What package type is used for SNJ54F374FK, and what are its key mechanical dimensions?

SNJ54F374FK uses the LCCC (Leadless Ceramic Chip Carrier) FK package: 20-terminal, 8.89 mm × 8.89 mm body, 1.27 mm pin pitch, and 2.03 mm maximum height. Its hermetic ceramic construction and land-grid layout are defined in TI's FK package outline drawing (4229370/A), supporting high-reliability surface-mount assembly in demanding military environments.

SNJ54F374FK Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SNJ54F374FK FAQ

1.How can I place an order for SNJ54F374FK through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54F374FK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SNJ54F374FK reliable?

The price and inventory of SNJ54F374FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54F374FK is usually 5 days.

3.What payment methods are accepted for SNJ54F374FK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54F374FK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54F374FK?

SNJ54F374FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54F374FK order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SNJ54F374FK?

For technical support, including SNJ54F374FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54F374FK requirements.

6.How does Aetrix verify that SNJ54F374FK is sourced from the original manufacturer or authorized distributors?

All SNJ54F374FK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SNJ54F374FK meets industry standards.

7.What is the process for return or replacement of SNJ54F374FK?

All SNJ54F374FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54F374FK, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SNJ54F374FK part is unused and in its original packaging.

Return procedure for SNJ54F374FK:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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