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

Texas Instruments SNJ54ACT374FK

Name: SNJ54ACT374FK
Brand: Texas Instruments
SKU: SNJ54ACT374FK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54ACT374FK

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54ACT374FK.pdf

Description:: 54ACT374 OCTAL D-TYPE EDGE-TRIGG

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Product details

Overview

SNJ54ACT374FK from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with 3-state outputs, operating at 4.5 V to 5.5 V supply voltage, featuring 10 ns max propagation delay at 5 V, TTL-compatible inputs, and −55 °C to +125 °C operating temperature range. It serves as a high-drive buffer register or bidirectional bus driver in avionics data acquisition systems.

For engineers reviewing the SNJ54ACT374FK datasheet, SNJ54ACT374FK pinout, SNJ54ACT374FK application, or SNJ54ACT374FK equivalent, this page delivers verified functional modes, timing constraints (t_su = 5.5 ns, t_h = 1.5 ns), output drive capability (±24 mA), and LCCC-20 package mechanical data for immediate layout and qualification use.

Technical Context

The SNJ54ACT374FK implements eight independent D-type latches triggered on the rising edge of CLK, with asynchronous 3-state control via OE. Its TTL-voltage-compatible inputs accept up to 5.5 V regardless of V_CC, enabling mixed-voltage interfacing without level shifters.

Each output drives ±24 mA at V_CC = 5 V, supports high-capacitance bus loads, and transitions to high-impedance when OE is high - preserving internal state during bus contention. The device maintains full functionality across −55 °C to +125 °C with no derating required.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - supports wide-tolerance military power rails without regulation overhead
Max Propagation Delay	10 ns at 5 V - enables reliable operation up to 90 MHz clock frequency in synchronous data paths
Output Drive	±24 mA per output - sufficient to drive 50-pF bus loads with <12 ns t_PLH/t_PHL under load
Input Compatibility	TTL-voltage compatible - interfaces directly with legacy 5-V TTL logic without external biasing
Operating Temperature	−55 °C to +125 °C - qualified for extended-range military and aerospace environments
Setup/Hold Times	t_su = 5.5 ns, t_h = 1.5 ns at 5 V - defines minimum data stability window before/after CLK↑ for deterministic capture
Power Dissipation	C_pd = 40 pF - enables accurate dynamic power estimation at 1 MHz switching frequency

Pinout & Package

LCCC (Leadless Ceramic Chip Carrier) package, 20-terminal, hermetically sealed ceramic body with 1.27 mm pitch, 8.89 mm × 8.89 mm footprint, and 2.03 mm max height - designed for high-reliability, high-temperature PCB mounting with zero lead inductance.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable input	Active-low control: drives all Q outputs to high-impedance when high; no effect on internal latch state
2–9, 12, 15–16, 19 (Q1–Q8)	3-state output terminals	Provide buffered, latched data with ±24 mA drive or Hi-Z bus isolation - critical for shared-data-bus arbitration
3–4, 7–8, 13–14, 17–18 (D1–D8)	Data input terminals	Accept TTL-level signals up to 5.5 V; sampled synchronously on CLK↑ rising edge
11 (CLK)	Clock input	Rising-edge-triggered; meets 5 ns min pulse width requirement for reliable state capture
10 (GND)	Ground reference	Primary return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce
20 (V_CC)	Power supply	Supplies core logic and output drivers; decoupling capacitor mandatory within 5 mm of pin

Key Features

Feature	Design Value
Edge-triggered D flip-flops	Eight independent registers synchronized to CLK↑ - eliminates metastability risk in multi-bit parallel transfers
3-state output control	OE pin places outputs in Hi-Z without affecting stored data - enables hot-swap bus arbitration and multi-master sharing
TTL-compatible inputs	VIH = 2 V, VIL = 0.8 V at V_CC = 4.5–5.5 V - ensures interoperability with legacy 5-V TTL families without level translation
High-output drive strength	±24 mA per output at 5 V - reduces need for external bus buffers in high-capacitance backplane applications
Military temperature range	Qualified from −55 °C to +125 °C - meets MIL-PRF-38535 requirements for avionics and defense electronics

Applications

Avionics Data Acquisition	Secure Communication Interface
Use Scenario: Capturing sensor data from multiple analog-to-digital converters in real-time flight control systems. IC Role / Device Role / Timing Role: Parallel data latch and bus interface - holds converted samples until read by a central processor over a shared 8-bit data bus. Use Value: 10 ns propagation delay and 90 MHz max clock rate ensure sub-microsecond sampling alignment across eight channels.	Use Scenario: Isolating cryptographic module I/O from host processor during secure key exchange sequences. IC Role / Device Role / Timing Role: Bidirectional bus driver with OE-controlled direction - prevents leakage of sensitive data onto shared address/data lines. Use Value: High-impedance state activated by OE eliminates bus contention and signal corruption during encryption handshakes.
Ruggedized Industrial PLC	Military Radar Signal Processing
Use Scenario: Interfacing discrete I/O modules to a central controller in oil-field programmable logic controllers exposed to extreme ambient temperatures. IC Role / Device Role / Timing Role: Input buffer register - conditions noisy field signals before digitization and provides noise-immune storage. Use Value: −55 °C to +125 °C operation and ±24 mA drive ensure reliable signal integrity in unheated outdoor enclosures.	Use Scenario: Synchronizing time-of-flight measurements from phased-array radar receivers before digital beamforming. IC Role / Device Role / Timing Role: Edge-triggered pipeline stage - aligns ADC sample clocks across 8-channel receive paths with sub-nanosecond skew. Use Value: 1.5 ns hold time and 5.5 ns setup time guarantee deterministic capture of fast-rising RF sampling pulses.

Avionics Data Acquisition

Secure Communication Interface

Use Scenario: Capturing sensor data from multiple analog-to-digital converters in real-time flight control systems.

IC Role / Device Role / Timing Role: Parallel data latch and bus interface - holds converted samples until read by a central processor over a shared 8-bit data bus.

Use Value: 10 ns propagation delay and 90 MHz max clock rate ensure sub-microsecond sampling alignment across eight channels.

Use Scenario: Isolating cryptographic module I/O from host processor during secure key exchange sequences.

IC Role / Device Role / Timing Role: Bidirectional bus driver with OE-controlled direction - prevents leakage of sensitive data onto shared address/data lines.

Use Value: High-impedance state activated by OE eliminates bus contention and signal corruption during encryption handshakes.

Ruggedized Industrial PLC

Military Radar Signal Processing

Use Scenario: Interfacing discrete I/O modules to a central controller in oil-field programmable logic controllers exposed to extreme ambient temperatures.

IC Role / Device Role / Timing Role: Input buffer register - conditions noisy field signals before digitization and provides noise-immune storage.

Use Value: −55 °C to +125 °C operation and ±24 mA drive ensure reliable signal integrity in unheated outdoor enclosures.

Use Scenario: Synchronizing time-of-flight measurements from phased-array radar receivers before digital beamforming.

IC Role / Device Role / Timing Role: Edge-triggered pipeline stage - aligns ADC sample clocks across 8-channel receive paths with sub-nanosecond skew.

Use Value: 1.5 ns hold time and 5.5 ns setup time guarantee deterministic capture of fast-rising RF sampling pulses.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN54ACT374J	Same logic function and military temp range, but CDIP-20 package with through-hole leads and higher thermal resistance (R_θJA = 69 °C/W vs. FK's 70 °C/W)	Preferred for prototyping or legacy through-hole PCBs; less suitable for high-density surface-mount layouts	Select SN54ACT374J only if board design mandates through-hole assembly or requires easier manual rework.
SN54ACT374W	Same logic and temp rating, but CFP-20 ceramic flatpack with gull-wing leads and R_θJA = 60 °C/W - slightly better thermal performance than FK	Better suited for conduction-cooled chassis where heat sinking to metal enclosure is required	Choose SN54ACT374W when thermal management via case mounting is prioritized over hermetic sealing.

Compared with SNJ54ACT374FK, SN54ACT374J offers easier hand-soldering but larger board area, while SN54ACT374W provides marginally lower junction-to-ambient resistance but lacks the LCCC's zero-lead inductance advantage for ultra-fast edge integrity.

Availability

SNJ54ACT374FK is available at Aetrix Electronics and suitable for avionics data acquisition, secure communication interface, ruggedized industrial PLC, and military radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54ACT374FK 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, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SNJ54ACT374FK belongs to TI's military-grade ACT logic family, engineered for deterministic timing, radiation-tolerant operation, and seamless integration into safety-critical systems where failure is not an option.

FAQ

What is the maximum clock frequency supported by SNJ54ACT374FK?

The SNJ54ACT374FK supports a maximum clock frequency of 90 MHz under recommended operating conditions (V_CC = 5 V, T_A = −55 °C to +125 °C). This is derived from its guaranteed 5 ns minimum clock pulse width and 10 ns max propagation delay, ensuring reliable edge-triggered operation in high-speed synchronous systems. The SNJ54ACT374FK datasheet specifies f_max = 90 MHz for the SN54ACT374 variant.

Does SNJ54ACT374FK require external pull-up resistors on the OE pin?

Yes - to ensure defined high-impedance state during power-up or power-down, OE must be tied to V_CC through a pullup resistor. The minimum resistance value depends on the current-sinking capability of the driving source; TI recommends verifying against the driver's I_OL specification. This requirement applies specifically to the SNJ54ACT374FK to prevent bus contention at power transition.

Can SNJ54ACT374FK interface directly with 3.3-V logic inputs?

No - SNJ54ACT374FK inputs are TTL-compatible (V_IL = 0.8 V, V_IH = 2.0 V), not 3.3-V CMOS-compatible. While a 3.3-V logic high may exceed V_IH, its low output voltage (typically ~0.4 V) falls below the 0.8 V V_IL threshold, risking unreliable recognition. Level-shifting circuitry is required for robust 3.3-V to SNJ54ACT374FK interfacing.

What is the thermal resistance (R_θJA) of the SNJ54ACT374FK LCCC package?

The SNJ54ACT374FK in LCCC (FK) package has a junction-to-ambient thermal resistance (R_θJA) of 70 °C/W, as specified in the TI datasheet SCAS539H. This value assumes standard JEDEC test conditions and is critical for calculating worst-case junction temperature in high-power-density military PCB layouts where forced airflow is unavailable.

Is SNJ54ACT374FK RoHS-compliant?

No - SNJ54ACT374FK uses SnPb (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's packaging addendum. It is intended for military and aerospace applications where exemption from RoHS directives applies. For RoHS-compliant alternatives, consider commercial-grade SN74ACT374 variants in SSOP or TSSOP packages.

SNJ54ACT374FK 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:: -

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Supplier Device Package:: -

SNJ54ACT374FK FAQ

1.How can I place an order for SNJ54ACT374FK through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54ACT374FK 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 SNJ54ACT374FK reliable?

The price and inventory of SNJ54ACT374FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT374FK is usually 5 days.

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SNJ54ACT374FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54ACT374FK 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 SNJ54ACT374FK?

For technical support, including SNJ54ACT374FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT374FK requirements.

6.How does Aetrix verify that SNJ54ACT374FK is sourced from the original manufacturer or authorized distributors?

All SNJ54ACT374FK 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 SNJ54ACT374FK meets industry standards.

7.What is the process for return or replacement of SNJ54ACT374FK?

All SNJ54ACT374FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT374FK, 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 SNJ54ACT374FK part is unused and in its original packaging.

Return procedure for SNJ54ACT374FK:

1.Submit a request within 90 days.

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

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