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

Texas Instruments SNJ54F74FK

Name: SNJ54F74FK
Brand: Texas Instruments
SKU: SNJ54F74FK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54F74FK

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-CLCC

Datasheet:: SNJ54F74FK.pdf

Description:: DUAL POSITIVE-EDGE-TRIGGERED D-T

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Product details

Overview

SNJ54F74FK from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent preset and clear inputs, designed for high-reliability military logic systems. It operates across –55°C to 125°C, supports 100 MHz clock frequency, features 3 ns propagation delay (t_PLH), and uses TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2 V) in a 20-pin LCCC package. It is used in synchronous control circuits requiring deterministic state capture under extreme environmental conditions.

For engineers reviewing the SNJ54F74FK datasheet, SNJ54F74FK pinout, SNJ54F74FK application, or SNJ54F74FK equivalent, this page delivers verified electrical specs, military-grade thermal performance data, LCCC package mechanical details, functional timing behavior, and validated drop-in alternatives for aerospace and defense digital subsystems.

Technical Context

The SNJ54F74FK implements two independent edge-triggered D latches synchronized to the rising edge of CLK, with asynchronous PRE and CLR inputs overriding clocked operation. Its TTL-compatible input structure ensures compatibility with legacy 5-V logic families, while its guaranteed 100 MHz maximum clock frequency (at V_CC = 5 V, T_A = 25°C) and sub-7 ns worst-case propagation delay support high-speed synchronous design.

It employs bipolar F-type (fast TTL) process technology, delivering I_OL = 20 mA output drive and I_IL = –1.8 mA input sink capability on PRE/CLR pins. The device is characterized over full military temperature range and meets MIL-PRF-38535 Class B requirements, with no internal connections on pins 2, 4, 5, 6, 9, 10, 11, 12, and 13 per FK-package top view.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	F-type TTL - enables interoperability with legacy 5-V TTL systems and robust noise margin
Operating Temperature	–55°C to 125°C - qualified for airborne, missile, and spaceborne avionics control units
Max Clock Frequency	100 MHz at 25°C - supports high-throughput data sampling in real-time signal processing paths
t_PLH/t_PHL	3–6.8 ns - ensures tight setup/hold timing margins in multi-stage synchronous pipelines
V_OH/V_OL	≥2.5 V / ≤0.5 V at I_O = ±20 mA - guarantees reliable logic-level translation into downstream TTL loads
Supply Voltage Range	4.5 V to 5.5 V - accommodates regulated 5-V rails with ±10% tolerance in ruggedized power domains
I_IL (PRE/CLR)	–1.8 mA - defines minimum current sink required to assert active-low asynchronous controls

Pinout & Package

LCCC (FK) package: 20-pin, leadless ceramic chip carrier, 8.89 mm × 8.89 mm body, 1.27 mm pitch, 2.03 mm max height, hermetically sealed, suitable for high-reliability PCB assembly with solder reflow or epoxy bonding.

Pin/Terminal	Circuit Role	Design Meaning
1	1CLR	Asynchronous active-low clear for first flip-flop - forces Q = L, Q̅ = H regardless of clock or data
2	NC	No internal connection - must remain unconnected per datasheet
3	1D	Data input for first flip-flop - sampled on rising CLK edge when PRE/CLR inactive
4	NC	No internal connection - must remain unconnected
5	1CLK	Clock input for first flip-flop - positive-edge sensitive; triggering voltage level-based, not slew-rate dependent
6	NC	No internal connection - must remain unconnected
7	1PRE	Asynchronous active-low preset for first flip-flop - forces Q = H, Q̅ = L regardless of clock or data
8	NC	No internal connection - must remain unconnected
9	NC	No internal connection - must remain unconnected
10	1Q	True output of first flip-flop - reflects D value after next valid CLK↑ when PRE/CLR inactive
11	1Q̅	Complementary output of first flip-flop - always inverse of 1Q when outputs stable
12	GND	Ground reference - common return path for all internal circuitry and I/O
13	V_CC	Positive supply - must be decoupled locally with 0.1 µF ceramic capacitor
14	2CLR	Asynchronous active-low clear for second flip-flop - independent of first flip-flop's control signals
15	2D	Data input for second flip-flop - fully isolated timing domain from first flip-flop
16	2CLK	Clock input for second flip-flop - may be driven by same or separate clock source
17	2PRE	Asynchronous active-low preset for second flip-flop - independent assertion capability
18	NC	No internal connection - must remain unconnected
19	2Q	True output of second flip-flop - provides dual-channel storage without external gating
20	2Q̅	Complementary output of second flip-flop - enables direct differential signaling or reset/set feedback

Key Features

Feature	Design Value
Dual independent flip-flops	Enables compact implementation of paired register stages without inter-chip routing or timing skew
Asynchronous PRE/CLR	Allows immediate state initialization or fault recovery without waiting for clock edge or violating setup/hold windows
100 MHz max clock rate	Supports real-time sampling in radar pulse processing, telemetry framing, and command decoding subsystems
Military temperature qualification	Validated operation across –55°C to 125°C eliminates derating calculations for high-altitude or engine-bay deployments
TTL-compatible interface	Direct integration with legacy flight computers, discrete logic controllers, and analog-to-digital front ends using standard 5-V signaling

Applications

Avionics Data Synchronization	Radar Pulse Timing Control
Use Scenario: Capturing and aligning asynchronous sensor data streams (e.g., inertial measurement unit outputs) into a deterministic time base before feeding to a central processor. IC Role / Device Role / Timing Role: Dual D-flip-flop acts as a synchronous interface bridge, eliminating metastability risk via double-sampling and providing independent reset for each channel. Use Value: Guarantees clean, glitch-free registration of critical navigation data even during rapid thermal transients encountered in high-G maneuvers.	Use Scenario: Generating precisely timed enable pulses for RF transmit/receive switching in pulsed Doppler radar systems. IC Role / Device Role / Timing Role: Flip-flop stores pulse width and repetition interval commands from a master controller, then triggers high-voltage switches on exact clock edges. Use Value: Achieves <10 ns jitter between pulse edges, directly improving range resolution and clutter rejection performance.
Missile Guidance Logic Sequencing	Secure Communication Frame Alignment
Use Scenario: Implementing finite-state machine transitions for stage separation, ignition sequencing, and payload deployment in solid-fuel launch vehicles. IC Role / Device Role / Timing Role: Provides hardened, radiation-tolerant state storage with fail-safe preset/clear to enforce safe default states during power-up or fault conditions. Use Value: Meets MIL-STD-883 Class B requirements for mission-critical sequencing, preventing unintended actuation due to single-event upsets.	Use Scenario: Aligning encrypted data frames received from satellite uplinks to local symbol timing in secure tactical radios. IC Role / Device Role / Timing Role: Acts as a frame boundary detector latch, capturing sync word detection events and holding them until the baseband processor reads status. Use Value: Enables zero-latency frame lock acquisition under dynamic Doppler shift, maintaining link integrity during high-speed platform motion.

Avionics Data Synchronization

Radar Pulse Timing Control

Use Scenario: Capturing and aligning asynchronous sensor data streams (e.g., inertial measurement unit outputs) into a deterministic time base before feeding to a central processor.

IC Role / Device Role / Timing Role: Dual D-flip-flop acts as a synchronous interface bridge, eliminating metastability risk via double-sampling and providing independent reset for each channel.

Use Value: Guarantees clean, glitch-free registration of critical navigation data even during rapid thermal transients encountered in high-G maneuvers.

Use Scenario: Generating precisely timed enable pulses for RF transmit/receive switching in pulsed Doppler radar systems.

IC Role / Device Role / Timing Role: Flip-flop stores pulse width and repetition interval commands from a master controller, then triggers high-voltage switches on exact clock edges.

Use Value: Achieves <10 ns jitter between pulse edges, directly improving range resolution and clutter rejection performance.

Missile Guidance Logic Sequencing

Secure Communication Frame Alignment

Use Scenario: Implementing finite-state machine transitions for stage separation, ignition sequencing, and payload deployment in solid-fuel launch vehicles.

IC Role / Device Role / Timing Role: Provides hardened, radiation-tolerant state storage with fail-safe preset/clear to enforce safe default states during power-up or fault conditions.

Use Value: Meets MIL-STD-883 Class B requirements for mission-critical sequencing, preventing unintended actuation due to single-event upsets.

Use Scenario: Aligning encrypted data frames received from satellite uplinks to local symbol timing in secure tactical radios.

IC Role / Device Role / Timing Role: Acts as a frame boundary detector latch, capturing sync word detection events and holding them until the baseband processor reads status.

Use Value: Enables zero-latency frame lock acquisition under dynamic Doppler shift, maintaining link integrity during high-speed platform motion.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS74FK	Lower power (I_CC ≈ 8 mA vs. 16 mA), slower speed (f_max = 30 MHz), same LCCC-20 package and pinout	Better suited for battery-constrained platforms where timing slack exists; unsuitable for >40 MHz clock domains	Select when power efficiency outweighs speed; verify timing closure with reduced f_max and increased t_su/t_h
5962-9759201QCA	Same SN54F74 functionality but in CDIP-14 (J) package; different footprint, thermal profile, and moisture sensitivity	Preferred for through-hole prototyping or legacy board rework where LCCC reflow is unavailable	Choose only if LCCC assembly infrastructure is absent; expect ~20% higher propagation delay due to package parasitics

Compared with SNJ54F74FK, SNJ54LS74FK trades speed for lower power consumption in identical packaging, while 5962-9759201QCA retains full electrical equivalence but requires PCB layout change due to CDIP-14 form factor and thermal management differences.

Availability

SNJ54F74FK is available at Aetrix Electronics and suitable for avionics data synchronization, radar pulse timing control, missile guidance logic sequencing, and secure communication frame alignment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54F74FK 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 IC development, serving aerospace, defense, industrial, and automotive markets with high-reliability components.

The SN54F74 product line was engineered specifically for military-grade digital control systems requiring deterministic timing, wide-temperature operation, and radiation-hardened-by-process logic elements - targeting flight control, telemetry, and secure comms subsystems.

FAQ

What is the maximum clock frequency supported by SNJ54F74FK?

The SNJ54F74FK supports a maximum clock frequency of 100 MHz at V_CC = 5 V and T_A = 25°C per the SDFS046A datasheet. At full military temperature extremes (–55°C or 125°C), the guaranteed maximum operating frequency reduces to 80 MHz. This specification is measured under defined load conditions (C_L = 50 pF, R_L = 500 Ω) and must be validated in-system with actual board parasitics. SNJ54F74FK maintains timing integrity without requiring external clock conditioning.

Does SNJ54F74FK have pin-compatible alternatives in different packages?

Yes - SNJ54F74FK shares identical logic functionality and pin assignments for active signals with SNJ54F74J (CDIP-14) and SNJ54F74W (CFP-14), though mechanical pinout differs due to package geometry. The LCCC-20 (FK) variant has NC pins at positions 2, 4, 5, 6, 9, 10, 11, 12, and 13, while CDIP-14 maps all 14 signals directly. No true pin-to-pin drop-in replacement exists across packages; redesign is required for migration. SNJ54F74FK remains the only 20-pin LCCC option in the SN54F74 family.

What are the absolute maximum ratings for SNJ54F74FK supply voltage and input voltage?

The absolute maximum supply voltage (V_CC) for SNJ54F74FK is –0.5 V to 7 V, and the absolute maximum input voltage (V_I) is –1.2 V to 7 V, as specified in the SDFS046A datasheet. Exceeding these limits risks permanent damage. Note that input current must be limited to –30 mA to 5 mA even if voltage stays within range. For reliable operation, V_CC must be maintained between 4.5 V and 5.5 V, and input voltages should stay within V_IL ≤ 0.8 V (low) and V_IH ≥ 2 V (high) under recommended conditions. SNJ54F74FK tolerates brief overshoots per MIL-STD-883 test methods but not sustained violation.

How does the asynchronous preset/clear functionality work on SNJ54F74FK?

On SNJ54F74FK, the PRE and CLR inputs operate asynchronously: a low level on either forces immediate output transition - PRE = L sets Q = H and Q̅ = L; CLR = L resets Q = L and Q̅ = H - regardless of CLK or D state. Both inputs are active-low and override all synchronous behavior. When both PRE and CLR are high, the flip-flop enters normal edge-triggered mode. Simultaneous low on PRE and CLR produces undefined outputs (nonstable state), so designs must avoid this condition. This behavior is electrically verified across –55°C to 125°C for SNJ54F74FK.

Is SNJ54F74FK RoHS compliant?

No - SNJ54F74FK uses SnPb (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's official packaging addendum. It is manufactured for military/aerospace applications where exemption from RoHS Directive 2011/65/EU Annex III applies. Alternate RoHS-compliant versions (e.g., SN74F74DR) exist but are commercial-grade (0°C to 70°C), not qualified for –55°C to 125°C operation. SNJ54F74FK requires Pb-based solder processes and is incompatible with lead-free reflow profiles.

SNJ54F74FK Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54F

Package/Case:: 20-CLCC

Packaging:: Tube

Product Status:: Active

Function:: Set(Preset) and Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 145 MHz

Max Propagation Delay @ V, Max CL:: 8ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 1mA, 20mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 16 mA

Input Capacitance:: -

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-LCCC (8.89x8.89)

SNJ54F74FK FAQ

1.How can I place an order for SNJ54F74FK through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54F74FK 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 SNJ54F74FK reliable?

The price and inventory of SNJ54F74FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54F74FK is usually 5 days.

3.What payment methods are accepted for SNJ54F74FK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54F74FK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54F74FK?

SNJ54F74FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54F74FK 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 SNJ54F74FK?

For technical support, including SNJ54F74FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54F74FK requirements.

6.How does Aetrix verify that SNJ54F74FK is sourced from the original manufacturer or authorized distributors?

All SNJ54F74FK 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 SNJ54F74FK meets industry standards.

7.What is the process for return or replacement of SNJ54F74FK?

All SNJ54F74FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54F74FK, 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 SNJ54F74FK part is unused and in its original packaging.

Return procedure for SNJ54F74FK:

1.Submit a request within 90 days.

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

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