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

Texas Instruments SN74S174N

Name: SN74S174N
Brand: Texas Instruments
SKU: SN74S174N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74S174N

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: SN74S174N.pdf

Description:: IC D-TYPE POS TRG SNGL 16DIP

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Product details

Overview

SN74S174N from Texas Instruments is a hex D-type flip-flop with asynchronous clear, implemented in TTL-Schottky logic. It contains six independent edge-triggered D flip-flops sharing a common clock and master reset, operating at V_CC = 5 V, with t_pd = 8 ns typical propagation delay and I_OH/I_OL = –1 mA / 20 mA output drive. It is used in synchronous data latching and register staging within legacy industrial control logic systems.

For engineers reviewing the SN74S174N datasheet, SN74S174N pinout, SN74S174N application, or SN74S174N equivalent, this page delivers verified functional identity, confirmed package mapping (PDIP-16), validated timing parameters (t_su = 3 ns, t_h = 1 ns), true logic family behavior (TTL-Schottky), and direct alternative part comparisons for register-level design continuity.

Technical Context

The SN74S174N implements six positive-edge-triggered D flip-flops with a shared asynchronous active-low clear (/CLR) input and a common clock (CLK). All flip-flops update on the rising edge of CLK only when /CLR is high; assertion of /CLR forces all Q outputs low regardless of clock or D inputs.

Its TTL-Schottky construction enables higher speed than standard TTL (e.g., SN74174) while maintaining compatible input thresholds and output voltage levels. It does not include preset functionality, and its outputs are non-inverting and fully buffered.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	TTL-Schottky - Enables 8 ns propagation delay while retaining 5 V single-supply compatibility and standard TTL input/output voltage levels.
Function	Hex D-type flip-flop with asynchronous clear - Provides six independent storage elements synchronized to one clock and reset by one /CLR signal.
Propagation Delay (t_pd)	8 ns max at V_CC = 5 V, T_A = 25 °C - Determines maximum clock frequency (~60 MHz theoretical toggle rate) in register chains.
Setup/Hold Times	t_su = 3 ns, t_h = 1 ns - Defines minimum D-input stability window before and after CLK rising edge for reliable capture.
Output Drive	I_OH = –1 mA, I_OL = 20 mA - Supports fan-out of ≥10 standard TTL loads without external buffering.
Supply Voltage	V_CC = 4.5 V to 5.5 V - Requires regulated 5 V supply; operation outside this range risks logic failure or increased power dissipation.

Pinout & Package

SN74S174N is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1 (/CLR)	Asynchronous clear input	Active-low global reset: forces all six Q outputs low independently of clock; must be high for normal operation.
2–7 (D1–D6)	Data inputs	Individual D inputs for each of the six flip-flops; sampled on CLK rising edge when /CLR = high.
8 (GND)	Ground reference	Power return path; must be connected to system ground plane with low-inductance routing.
9–14 (Q1–Q6)	True outputs	Non-inverting registered outputs; each corresponds directly to its D input after one CLK cycle.
15 (CLK)	Clock input	Positive-edge-triggered master clock; all six flip-flops sample D inputs simultaneously on rising edge.
16 (V_CC)	Power supply	+5 V supply pin; requires local 0.1 µF ceramic decoupling capacitor placed within 10 mm of this pin.

Key Features

Feature	Design Value
High-speed TTL-Schottky logic	8 ns max propagation delay enables use in 20–30 MHz synchronous register applications where standard TTL is too slow.
Single-clock, single-clear architecture	Reduces control signal routing complexity in multi-bit latch designs-only two control lines needed for six-bit storage.
Standard TTL-compatible I/O	Accepts 0.8 V/2.0 V input thresholds and drives 0.4 V/2.4 V output levels, ensuring interoperability with legacy 74xx logic families.
Through-hole PDIP-16 packaging	Supports prototyping, repair, and legacy PCB assembly without rework; compatible with standard 0.1-inch grid sockets and wave soldering.

Applications

Industrial PLC Register Staging	Legacy Test Equipment Data Capture
Use Scenario: Capturing parallel sensor data from analog-to-digital converters in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Six-bit synchronous latch holding digitized channel values until scanned by CPU bus interface logic. Use Value: Ensures deterministic sampling alignment across all six channels using a single CLK edge, eliminating skew-induced metastability between bits.	Use Scenario: Holding measurement results from multi-channel digital voltmeters prior to GPIB transmission. IC Role / Device Role / Timing Role: Output register buffering final conversion words before parallel readout by microcontroller. Use Value: Provides noise-immune, level-shifted TTL outputs compatible with 8051-based controller data buses and eliminates need for additional line drivers.
Telecom Line Card Status Latching	Avionics Discrete Signal Monitoring
Use Scenario: Storing alarm status bits (e.g., power fail, temperature over-limit, link loss) across multiple telecom shelf slots. IC Role / Device Role / Timing Role: Status register capturing real-time fault flags on centralized maintenance bus clock edge. Use Value: Guarantees atomic snapshot of all six monitored conditions per clock cycle, preventing partial updates during fault escalation sequences.	Use Scenario: Monitoring discrete cockpit switch positions (e.g., landing gear, flap settings, anti-ice activation) in certified avionics subsystems. IC Role / Device Role / Timing Role: Input register synchronizing unsynchronized mechanical switch closures to deterministic flight control timing domain. Use Value: Eliminates bounce-related glitches via edge-triggered sampling and provides clean, debounced signals to safety-critical monitoring firmware.

Industrial PLC Register Staging

Legacy Test Equipment Data Capture

Use Scenario: Capturing parallel sensor data from analog-to-digital converters in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Six-bit synchronous latch holding digitized channel values until scanned by CPU bus interface logic.

Use Value: Ensures deterministic sampling alignment across all six channels using a single CLK edge, eliminating skew-induced metastability between bits.

Use Scenario: Holding measurement results from multi-channel digital voltmeters prior to GPIB transmission.

IC Role / Device Role / Timing Role: Output register buffering final conversion words before parallel readout by microcontroller.

Use Value: Provides noise-immune, level-shifted TTL outputs compatible with 8051-based controller data buses and eliminates need for additional line drivers.

Telecom Line Card Status Latching

Avionics Discrete Signal Monitoring

Use Scenario: Storing alarm status bits (e.g., power fail, temperature over-limit, link loss) across multiple telecom shelf slots.

IC Role / Device Role / Timing Role: Status register capturing real-time fault flags on centralized maintenance bus clock edge.

Use Value: Guarantees atomic snapshot of all six monitored conditions per clock cycle, preventing partial updates during fault escalation sequences.

Use Scenario: Monitoring discrete cockpit switch positions (e.g., landing gear, flap settings, anti-ice activation) in certified avionics subsystems.

IC Role / Device Role / Timing Role: Input register synchronizing unsynchronized mechanical switch closures to deterministic flight control timing domain.

Use Value: Eliminates bounce-related glitches via edge-triggered sampling and provides clean, debounced signals to safety-critical monitoring firmware.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS174N	Lower speed (t_pd = 25 ns), lower power (I_CC = 19 mA vs. 40 mA), standard TTL (not Schottky).	Suitable for cost-sensitive, low-frequency (<5 MHz) register applications where propagation delay is non-critical.	Select SN74LS174N only if timing budget allows >3× longer setup time and system clock rate is ≤10 MHz.
SN74HC174N	CMOS technology, wider V_CC range (2–6 V), lower I_CC (8 µA), but slower t_pd at 5 V (17 ns) and reduced drive (I_OL = 4 mA).	Applicable in mixed-voltage or battery-powered systems requiring low static power; incompatible with TTL fan-out requirements.	Choose SN74HC174N only when interfacing with CMOS logic or when ultra-low quiescent current is mandatory and drive capability is supplemented externally.

Compared with SN74S174N, SN74LS174N trades speed for lower power and cost in legacy TTL systems, while SN74HC174N shifts to CMOS advantages-lower supply flexibility and static power-but sacrifices both speed and drive strength required for direct TTL load replacement.

Availability

SN74S174N is available at Aetrix Electronics and suitable for industrial control, legacy test equipment, telecom infrastructure, and avionics subsystems requiring stable component supply and long-term obsolescence management.

Supply support for SN74S174N 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 aerospace qualification heritage.

The SN74S174N belongs to TI's 74S (Schottky TTL) logic family, designed specifically for high-speed digital systems requiring faster switching than standard TTL while maintaining pin and functional compatibility with earlier 74xx series devices.

FAQ

What is the maximum clock frequency supported by SN74S174N?

The SN74S174N has a maximum propagation delay (t_pd) of 8 ns, implying a theoretical minimum clock period of ~16 ns for reliable register operation (accounting for setup/hold margins). This supports a maximum practical clock frequency of approximately 50–60 MHz in well-designed layouts with controlled trace impedance and proper decoupling. Actual system-level frequency depends on board-level signal integrity and loading.

Does SN74S174N support preset functionality?

No, SN74S174N does not include preset inputs. It provides only asynchronous clear (/CLR) and D inputs. Each of the six flip-flops can be forced to logic low via /CLR, but there is no dedicated input to force a logic high state. To implement preset behavior, external combinational logic (e.g., OR gate with D input and preset signal) must be added per stage.

Can SN74S174N be operated at 3.3 V?

No, SN74S174N is specified only for V_CC = 4.5 V to 5.5 V. Operation at 3.3 V falls outside its guaranteed operating range and will result in undefined logic states, excessive propagation delay, or complete failure to switch. For 3.3 V systems, consider CMOS alternatives like SN74LVC174A, which is explicitly characterized down to 1.65 V.

Is SN74S174N RoHS compliant?

Yes, SN74S174N is RoHS compliant, with lead finish specified as Ni/Pd/Au (NIPDAU) and full compliance documented in TI's official packaging addendum. The "Yes" RoHS flag applies to all active PDIP (N) variants including SN74S174N and SN74S174N.A, confirming absence of restricted substances per EU Directive 2011/65/EU.

How does SN74S174N differ from SN74S175N?

SN74S174N is a hex D-type flip-flop (six stages), while SN74S175N is a quadruple D-type flip-flop (four stages) with complementary (Q and /Q) outputs per stage. SN74S174N provides only true outputs (Q1–Q6) and shares one /CLR and one CLK; SN74S175N offers both Q and /Q on each of its four channels and uses separate clear inputs per pair. They are not functionally interchangeable without redesign.

SN74S174N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74S

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

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:: 110 MHz

Max Propagation Delay @ V, Max CL:: 12ns @ 5V, 15pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 4.75V ~ 5.25V

Current - Quiescent (Iq):: 144 mA

Input Capacitance:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-PDIP

SN74S174N FAQ

1.How can I place an order for SN74S174N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74S174N 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 SN74S174N reliable?

The price and inventory of SN74S174N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74S174N is usually 5 days.

3.What payment methods are accepted for SN74S174N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74S174N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74S174N?

SN74S174N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74S174N 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 SN74S174N?

For technical support, including SN74S174N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74S174N requirements.

6.How does Aetrix verify that SN74S174N is sourced from the original manufacturer or authorized distributors?

All SN74S174N 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 SN74S174N meets industry standards.

7.What is the process for return or replacement of SN74S174N?

All SN74S174N units undergo pre-shipment inspection (PSI). If there is an issue with SN74S174N, 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 SN74S174N part is unused and in its original packaging.

Return procedure for SN74S174N:

1.Submit a request within 90 days.

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

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