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

Texas Instruments SN74F174AD

Name: SN74F174AD
Brand: Texas Instruments
SKU: SN74F174AD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F174AD

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74F174AD.pdf

Description:: IC FF D-TYPE SNGL 6BIT 16SOIC

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Product details

Overview

SN74F174AD from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in F-series TTL logic. It contains six independent D-flip-flops, each with buffered clock and direct clear inputs, 5 V nominal supply operation, 80 MHz max clock frequency at full temperature range (0°C to 70°C), and TTL-compatible input/output levels. It serves as a storage register in digital control systems requiring deterministic state capture on clock rise.

For engineers reviewing the SN74F174AD datasheet, SN74F174AD pinout, SN74F174AD application, or SN74F174AD equivalent, key selection considerations include its 16-pin SOIC (D) package, 4.5–5.5 V supply range, 4.5 ns typical propagation delay (tPLH), -1 mA high-level output drive, and compatibility with legacy TTL bus interfaces in industrial control and test equipment.

Technical Context

The SN74F174AD implements six identical, edge-triggered D-type latches synchronized to the rising edge of CLK, with asynchronous active-low CLR overriding clocked behavior. Each flip-flop features fully buffered inputs and outputs to minimize crosstalk and ensure noise immunity in mixed-signal environments.

It operates strictly within TTL voltage thresholds: VIH ≥ 2 V, VIL ≤ 0.8 V, VOH ≥ 2.5 V (at IOH = –1 mA), VOL ≤ 0.5 V (at IOL = 20 mA), and supports fan-out of up to 10 standard TTL loads per output.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	F-series TTL - ensures interoperability with legacy 74xx TTL systems and predictable timing under load
Supply Voltage Range	4.5 V to 5.5 V - compatible with regulated 5 V rails; no internal regulation required
Max Clock Frequency	80 MHz at 0°C to 70°C - supports high-speed register transfer in real-time control loops
tPLH / tPHL	2.7 ns / 3.4 ns typical (VCC = 5 V, CL = 50 pF) - enables sub-10 ns cycle timing margins
Output Drive	IOL = 20 mA, IOH = –1 mA - sufficient for driving multiple TTL inputs without external buffers
Operating Temperature	0°C to 70°C - rated for commercial-grade embedded applications, not extended industrial or automotive
Input Clamp Current	–18 mA - protects against negative transients during hot insertion or ESD events

Pinout & Package

SN74F174AD is supplied in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm body width, and moisture sensitivity level 1 (260°C peak reflow). Pin 1 is located in quadrant Q1 per tape-and-reel orientation standards.

Pin/Terminal	Circuit Role	Design Meaning
1 (CLR)	Asynchronous Clear Input	Active-low reset for all six flip-flops; overrides clock and data regardless of CLK state
2–7, 10–12, 15 (Q1–Q6)	True Outputs	Non-inverted registered outputs; fully buffered for low capacitive loading and high noise immunity
3–6, 11, 13, 14 (D1–D6)	Data Inputs	Independent D inputs for each flip-flop; require setup time ≥4.5 ns before CLK↑
9 (CLK)	Clock Input	Positive-edge-triggered global clock; internally buffered to reject slow-rising or noisy edges
8 (GND)	Ground Reference	Power return path for all logic and output stages; must be low-impedance for stable switching
16 (VCC)	Supply Voltage	+5 V power rail; decoupling capacitor (0.1 µF) required near pin for transient current suppression

Key Features

Feature	Design Value
Six independent D-flip-flops	Enables compact implementation of 6-bit parallel registers or shift register stages without external gating
Direct asynchronous clear	Allows system-wide reset without clock dependency-critical for initialization and fault recovery
Fully buffered I/O	Reduces sensitivity to PCB trace capacitance and adjacent signal switching, improving timing predictability
TTL-compatible voltage thresholds	Guarantees interoperability with legacy 74LS/74S logic families without level-shifting circuitry
SOIC-16 packaging	Supports automated SMT assembly and offers 30% board area reduction versus PDIP-16 alternatives

Applications

Buffer/Storage Register	Shift Register Stage
Use Scenario: Holding microcontroller I/O port states during interrupt service or DMA cycles. IC Role / Device Role / Timing Role: Parallel data latch providing glitch-free hold of 6-bit status flags or sensor readings. Use Value: Eliminates need for discrete latches or microcontroller GPIO toggling, reducing firmware overhead and timing uncertainty.	Use Scenario: Building multi-stage serial-to-parallel converters in test instrumentation. IC Role / Device Role / Timing Role: One stage of a 6-bit shift register chain, clocked synchronously across multiple SN74F174AD units. Use Value: Enables precise bit alignment and deterministic latency (≤11 ns max tPHL) between stages for waveform generation.
Pattern Generator	Digital Control Sequencer
Use Scenario: Generating fixed test patterns for FPGA configuration validation or logic analyzer stimulus. IC Role / Device Role / Timing Role: State-holding element in a hardwired pattern loop, driven by a master clock and reset signal. Use Value: Provides repeatable, jitter-free 6-bit output sequences without software intervention or memory access latency.	Use Scenario: Controlling solenoid actuation timing in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Registering control bits from a microcontroller to isolate timing-critical outputs from CPU bus contention. Use Value: Ensures deterministic output assertion within 9 ns of clock edge, meeting <100 ns response requirements in safety-critical loops.

Buffer/Storage Register

Shift Register Stage

Use Scenario: Holding microcontroller I/O port states during interrupt service or DMA cycles.

IC Role / Device Role / Timing Role: Parallel data latch providing glitch-free hold of 6-bit status flags or sensor readings.

Use Value: Eliminates need for discrete latches or microcontroller GPIO toggling, reducing firmware overhead and timing uncertainty.

Use Scenario: Building multi-stage serial-to-parallel converters in test instrumentation.

IC Role / Device Role / Timing Role: One stage of a 6-bit shift register chain, clocked synchronously across multiple SN74F174AD units.

Use Value: Enables precise bit alignment and deterministic latency (≤11 ns max tPHL) between stages for waveform generation.

Pattern Generator

Digital Control Sequencer

Use Scenario: Generating fixed test patterns for FPGA configuration validation or logic analyzer stimulus.

IC Role / Device Role / Timing Role: State-holding element in a hardwired pattern loop, driven by a master clock and reset signal.

Use Value: Provides repeatable, jitter-free 6-bit output sequences without software intervention or memory access latency.

Use Scenario: Controlling solenoid actuation timing in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Registering control bits from a microcontroller to isolate timing-critical outputs from CPU bus contention.

Use Value: Ensures deterministic output assertion within 9 ns of clock edge, meeting <100 ns response requirements in safety-critical loops.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS174N	Lower speed (fmax = 30 MHz), higher input current (IIL = –1.6 mA), same pinout and function	Preferred where lower power consumption and reduced drive strength suffice; unsuitable for >40 MHz clock domains	Select when thermal budget or legacy LS-system compatibility outweighs speed requirements
SN74HC174DR	CMOS technology, wider VCC range (2–6 V), lower Icc (8 µA typ), but slower tPLH (23 ns typ at 6 V)	Used in battery-powered or mixed-voltage systems; incompatible with TTL input thresholds without pull-ups	Choose for modern low-power designs with 3.3 V or dual-rail operation; requires level adaptation for 5 V TTL buses

Compared with SN74LS174N and SN74HC174DR, the SN74F174AD delivers superior speed and TTL-native drive capability at the cost of higher static current (ICCL = 39–55 mA), making it optimal for legacy 5 V systems demanding sub-10 ns timing determinism.

Availability

SN74F174AD is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment upgrades, and military-grade avionics maintenance tools requiring stable component supply and long-term obsolescence management.

Supply support for SN74F174AD 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 logic ICs with broad industrial and automotive qualification.

The SN74F174AD belongs to TI's 74F TTL logic family, engineered for high-speed digital control applications where deterministic timing, noise immunity, and backward compatibility with 74xx systems are essential.

FAQ

What is the maximum operating clock frequency of the SN74F174AD over its full temperature range?

The SN74F174AD guarantees a maximum clock frequency of 80 MHz across its specified operating temperature range of 0°C to 70°C. This rating is validated under worst-case conditions: VCC = 4.5 V, CL = 50 pF, and RL = 500 Ω. At 25°C and VCC = 5 V, the device achieves up to 100 MHz, but system designs must use the 80 MHz limit for robustness. The SN74F174AD does not support operation beyond 70°C ambient.

Does the SN74F174AD support 3.3 V operation?

No, the SN74F174AD is not rated for 3.3 V operation. Its recommended operating supply voltage is strictly 4.5 V to 5.5 V, and electrical characteristics-including VOH, VOL, and input thresholds-are only guaranteed within that range. Applying 3.3 V may result in marginal or non-functional behavior, especially for high-level output drive and noise margin. For 3.3 V systems, consider the SN74HC174DR instead.

Is the SN74F174AD pin-compatible with the SN74LS174?

Yes, the SN74F174AD is pin-compatible and functionally equivalent to the SN74LS174 in both SOIC (D) and PDIP (N) packages. Both share identical pin assignments, truth table, and logic behavior-including asynchronous clear and positive-edge clocking. However, the SN74F174AD offers higher speed and greater output drive, while the LS version consumes less power.

What is the purpose of the "R" terminal shown in the logic diagram of the SN74F174AD?

The "R" terminal in the SN74F174AD logic diagram is an internal node label-not a physical pin-and represents the reset input to the internal latch core. It corresponds directly to the externally accessible CLR (pin 1) signal. All six flip-flops share this single asynchronous clear path, and no separate "R" pin exists on the SN74F174AD package. The symbol follows ANSI/IEEE Std 91-1984 conventions for clarity in functional representation.

Can the SN74F174AD drive standard TTL loads directly?

Yes, the SN74F174AD can drive up to 10 standard TTL loads per output, as confirmed by its guaranteed IOL = 20 mA and IOH = –1 mA specifications under recommended operating conditions. Its VOH ≥ 2.5 V (at IOH = –1 mA) and VOL ≤ 0.5 V (at IOL = 20 mA) meet TTL interface requirements. No external buffer is needed for interfacing with 74LS, 74S, or other standard TTL inputs when used within its rated VCC and temperature range.

SN74F174AD Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74F

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 6

Clock Frequency:: 140 MHz

Max Propagation Delay @ V, Max CL:: 10ns @ 5V, 50pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 45 mA

Input Capacitance:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74F174AD FAQ

1.How can I place an order for SN74F174AD through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F174AD 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 SN74F174AD reliable?

The price and inventory of SN74F174AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F174AD is usually 5 days.

3.What payment methods are accepted for SN74F174AD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F174AD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F174AD?

SN74F174AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F174AD 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 SN74F174AD?

For technical support, including SN74F174AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F174AD requirements.

6.How does Aetrix verify that SN74F174AD is sourced from the original manufacturer or authorized distributors?

All SN74F174AD 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 SN74F174AD meets industry standards.

7.What is the process for return or replacement of SN74F174AD?

All SN74F174AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74F174AD, 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 SN74F174AD part is unused and in its original packaging.

Return procedure for SN74F174AD:

1.Submit a request within 90 days.

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

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