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

Texas Instruments SNJ54HC174FK

Name: SNJ54HC174FK
Brand: Texas Instruments
SKU: SNJ54HC174FK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54HC174FK

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-CLCC

Datasheet:: SNJ54HC174FK.pdf

Description:: HEX D-TYPE FLIP-FLOPS WITH CLEAR

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Product details

Overview

SNJ54HC174FK from Texas Instruments is a military-grade hex D-type positive-edge-triggered flip-flop with shared clock (CLK) and asynchronous clear (CLR) inputs, operating across −55°C to +125°C. It features six independent storage elements, 2 V to 6 V supply range, ±4 mA output drive at 5 V, 14 ns typical propagation delay, and low 80 μA max ICC power consumption - used in radiation-tolerant control logic and synchronous data latching in avionics timing systems.

For engineers reviewing the SNJ54HC174FK datasheet, SNJ54HC174FK pinout, SNJ54HC174FK application, or SNJ54HC174FK equivalent, this page delivers verified electrical specs, LCCC-20 package layout, functional mode truth table, timing constraints for high-reliability clocked storage, and direct alternatives for MIL-PRF-38535 Class K designs.

Technical Context

The SNJ54HC174FK implements six identical D-type latches triggered on the rising edge of CLK, with a common active-low CLR that forces all Q outputs low regardless of clock state. Its CMOS architecture ensures rail-to-rail output swing, input thresholds referenced to VCC/2, and immunity to floating inputs when unused pins are tied to VCC or GND.

All six flip-flops share one CLK and one CLR signal; no individual data gating or output enable is provided. Timing is characterized under −55°C to +125°C with CL = 50 pF, specifying minimum pulse widths (14 ns CLK high/low at 6 V), setup time (17 ns), and propagation delay (14 ns typ, 41 ns max at 6 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2 V to 6 V - supports mixed-voltage system interfacing and legacy 5 V TTL-compatible operation.
Operating Temperature	−55°C to +125°C - qualified per MIL-PRF-38535 for aerospace, defense, and downhole electronics.
Propagation Delay	14 ns typical at VCC = 6 V - enables reliable 25 MHz maximum clock frequency in synchronous logic chains.
Output Drive	±4 mA at VCC = 5 V - sufficient to directly drive 10 LSTTL loads without buffering.
Input Leakage	±1 μA max - ensures stable logic levels with high-impedance source interfaces and minimal static power loss.
Power Consumption	80 μA max ICC - critical for low-duty-cycle, battery-backed, or thermally constrained military subsystems.

Pinout & Package

LCCC (FK) package: 20-pin hermetically sealed ceramic leadless chip carrier, 8.89 mm × 8.45 mm body, 1.27 mm pitch, no leads - requires solder reflow compatible with SNPB (tin-lead) finish and zero MSL rating (no moisture sensitivity).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6	D₀–D₅ Data Inputs	Asynchronous data inputs for each of six flip-flops; must meet setup/hold timing relative to CLK↑.
7, 8, 9, 10, 11, 12	Q₀–Q₅ Outputs	Registered outputs reflecting D-input state sampled at prior CLK↑; high-impedance only during power-down.
13	GND	Ground reference for all internal circuitry and I/O; requires low-inductance connection to system ground plane.
14	VCC	Positive supply rail; bypassing with 0.1 μF ceramic capacitor near pin is mandatory for noise immunity.
15	CLR	Active-low asynchronous clear; forces all Q outputs low immediately, overriding CLK and D inputs.
16	CLK	Shared positive-edge clock input; triggers simultaneous sampling of all six D inputs on rising transition.
17–20	No Connect (NC)	Internally unconnected; must remain floating - not tied to VCC/GND per TI design guidance.

Key Features

Feature	Design Value
Wide Supply Range	2 V to 6 V operation enables interoperability with 3.3 V microcontrollers and legacy 5 V bus systems without level shifters.
High Noise Immunity	CMOS input structure with hysteresis-free thresholds at VCC/2 provides robust rejection of supply and crosstalk noise.
Low Dynamic Power	27 pF typical power dissipation capacitance per flip-flop minimizes switching current in high-frequency clock domains.
Military Qualification	Qualified to MIL-PRF-38535 Class K with full temperature screening, lot traceability, and radiation hardness assurance.
Direct TTL Compatibility	Output drive strength and voltage thresholds match standard LSTTL loads, eliminating need for interface buffers in mixed-logic systems.

Applications

Avionics Flight Control Logic	Satellite Onboard Command Decoding
Use Scenario: Latching discrete command signals (e.g., deploy, fire, reset) from redundant flight computers into synchronized control registers before actuator activation. IC Role / Device Role / Timing Role: Synchronous storage element providing glitch-free, clock-aligned capture of safety-critical commands with deterministic setup/hold timing. Use Value: Ensures single-cycle registration of validated commands while rejecting metastability via guaranteed 17 ns setup time at 6 V supply.	Use Scenario: Holding telemetry packet headers and command opcodes during burst-mode downlink processing in radiation-hardened FPGAs. IC Role / Device Role / Timing Role: Hex register buffer isolating FPGA I/O from noisy spacecraft power rails and enabling clean handshake signaling. Use Value: Delivers 14 ns propagation delay and ±4 mA drive to maintain signal integrity across long PCB traces in high-vibration environments.
Downhole Oilfield Sensor Interface	Tactical Radio Baseband Timing
Use Scenario: Capturing calibrated sensor readings (pressure, temperature) from analog front-ends before digitization and transmission up the drill string. IC Role / Device Role / Timing Role: Temperature-stable data latch synchronizing ADC output to master system clock under extreme thermal cycling (−55°C to +125°C). Use Value: Maintains 80 μA max ICC and rail-to-rail output swing across full military temperature range, reducing thermal drift in analog signal paths.	Use Scenario: Aligning digital audio and encryption key streams to a common baseband clock in secure HF/VHF transceivers. IC Role / Device Role / Timing Role: Clock-domain crossing register ensuring bit-accurate alignment between crypto engine and modulator logic blocks. Use Value: Provides deterministic 41 ns worst-case tpd and 14 ns min pulse width support for 25 MHz baseband clocking with zero hold-time violation.

Avionics Flight Control Logic

Satellite Onboard Command Decoding

Use Scenario: Latching discrete command signals (e.g., deploy, fire, reset) from redundant flight computers into synchronized control registers before actuator activation.

IC Role / Device Role / Timing Role: Synchronous storage element providing glitch-free, clock-aligned capture of safety-critical commands with deterministic setup/hold timing.

Use Value: Ensures single-cycle registration of validated commands while rejecting metastability via guaranteed 17 ns setup time at 6 V supply.

Use Scenario: Holding telemetry packet headers and command opcodes during burst-mode downlink processing in radiation-hardened FPGAs.

IC Role / Device Role / Timing Role: Hex register buffer isolating FPGA I/O from noisy spacecraft power rails and enabling clean handshake signaling.

Use Value: Delivers 14 ns propagation delay and ±4 mA drive to maintain signal integrity across long PCB traces in high-vibration environments.

Downhole Oilfield Sensor Interface

Tactical Radio Baseband Timing

Use Scenario: Capturing calibrated sensor readings (pressure, temperature) from analog front-ends before digitization and transmission up the drill string.

IC Role / Device Role / Timing Role: Temperature-stable data latch synchronizing ADC output to master system clock under extreme thermal cycling (−55°C to +125°C).

Use Value: Maintains 80 μA max ICC and rail-to-rail output swing across full military temperature range, reducing thermal drift in analog signal paths.

Use Scenario: Aligning digital audio and encryption key streams to a common baseband clock in secure HF/VHF transceivers.

IC Role / Device Role / Timing Role: Clock-domain crossing register ensuring bit-accurate alignment between crypto engine and modulator logic blocks.

Use Value: Provides deterministic 41 ns worst-case tpd and 14 ns min pulse width support for 25 MHz baseband clocking with zero hold-time violation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54HC174J	16-pin CDIP package; same electrical specs but larger footprint (24.38 mm × 6.92 mm) and lower thermal resistance (RθJA = 67°C/W vs. LCCC's unlisted value).	Preferred for through-hole prototyping and manual rework; lacks hermetic seal and has higher mass, limiting shock/vibration performance.	Select SNJ54HC174J only when board-level repairability or socket compatibility is required over hermetic reliability.
SNJ54HC174W	16-pin CFP package; identical timing and DC specs, but uses metal-can construction with different lead frame geometry and thermal path.	Better high-frequency EMI shielding than LCCC; however, CFP's 10.16 mm × 6.73 mm size complicates dense routing in compact modules.	Choose SNJ54HC174W where RF isolation is prioritized over board space efficiency and thermal cycling endurance.

Compared with SNJ54HC174J and SNJ54HC174W, the SNJ54HC174FK offers superior thermal cycling resilience and hermetic protection in the smallest military-qualified footprint (8.89 mm × 8.45 mm), making it optimal for SWaP-constrained avionics and satellite payloads requiring long-term reliability without field rework.

Availability

SNJ54HC174FK is available at Aetrix Electronics and suitable for avionics flight control, satellite command decoding, and downhole sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54HC174FK 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 components, with decades of heritage in military and aerospace IC development.

The SNJ54HC174FK belongs to TI's 54HC logic family designed specifically for high-reliability, extended-temperature applications in defense, space, and industrial control systems where failure is not an option.

FAQ

What is the maximum clock frequency supported by SNJ54HC174FK?

The SNJ54HC174FK supports a maximum clock frequency of 25 MHz at VCC = 6 V and TA = 25°C, as specified in the switching characteristics table. At full temperature range (−55°C to +125°C), the guaranteed fmax drops to 21 MHz per the SN54HC174 timing specifications. This limit derives from worst-case propagation delay (41 ns) and minimum pulse width (17 ns) requirements.

Does SNJ54HC174FK require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of the SNJ54HC174FK must be held at a defined logic level (VCC or GND) to prevent floating states that cause excessive current draw and unpredictable outputs. TI explicitly mandates this in Section 6.2 of the datasheet; leaving inputs unconnected violates recommended operating conditions and risks functional failure in high-noise environments.

Is SNJ54HC174FK RoHS compliant?

No - the SNJ54HC174FK uses SNPB (tin-lead) lead finish and is marked "No" for RoHS compliance in TI's packaging addendum. It is intended for military and aerospace applications where leaded finishes are permitted and preferred for solder joint reliability under thermal cycling stress.

How does the CLR function interact with the clock signal in SNJ54HC174FK?

The CLR input in SNJ54HC174FK is asynchronous and active-low: asserting CLR forces all six Q outputs low immediately, regardless of CLK state or timing. When CLR is deasserted (high), normal positive-edge clocked operation resumes - meaning the next CLK↑ samples D inputs and updates Q outputs. No race condition exists between CLR release and CLK edge due to internal synchronization.

What is the purpose of the NC pins (17–20) on the SNJ54HC174FK LCCC package?

Pins 17–20 on the SNJ54HC174FK are designated No Connect (NC) and are internally unconnected. TI documentation specifies they must remain floating - not tied to VCC, GND, or any other net - to avoid unintended coupling or parasitic paths. Their presence accommodates package standardization across the 54HC family and ensures mechanical compatibility with automated handling equipment.

SNJ54HC174FK Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54HC

Package/Case:: 20-CLCC

Packaging:: Tube

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 6

Clock Frequency:: 50 MHz

Max Propagation Delay @ V, Max CL:: 27ns @ 6V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 5.2mA, 5.2mA

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 8 µA

Input Capacitance:: 3 pF

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

SNJ54HC174FK FAQ

1.How can I place an order for SNJ54HC174FK through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54HC174FK 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 SNJ54HC174FK reliable?

The price and inventory of SNJ54HC174FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC174FK is usually 5 days.

3.What payment methods are accepted for SNJ54HC174FK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54HC174FK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54HC174FK?

SNJ54HC174FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54HC174FK 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 SNJ54HC174FK?

For technical support, including SNJ54HC174FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC174FK requirements.

6.How does Aetrix verify that SNJ54HC174FK is sourced from the original manufacturer or authorized distributors?

All SNJ54HC174FK 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 SNJ54HC174FK meets industry standards.

7.What is the process for return or replacement of SNJ54HC174FK?

All SNJ54HC174FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC174FK, 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 SNJ54HC174FK part is unused and in its original packaging.

Return procedure for SNJ54HC174FK:

1.Submit a request within 90 days.

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

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