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

Texas Instruments SN74LS175NS

Name: SN74LS175NS
Brand: Texas Instruments
SKU: SN74LS175NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS175NS

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 16-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74LS175NS.pdf

Description:: D FLIP-FLOP, LS SERIES TTL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74LS175NS from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with individual data inputs and a shared asynchronous clear, operating at 5 V with TTL-compatible I/O, 25 ns max propagation delay, and complementary Q/Q̅ outputs per stage - used in synchronous storage registers and pattern generation circuits.

For engineers reviewing the SN74LS175NS datasheet, SN74LS175NS pinout, SN74LS175NS application, or SN74LS175NS equivalent, key selection criteria include TTL-level timing margins (tsu = 20 ns), output drive capability (–0.4 mA / +8 mA), quad-bit latch density in a 16-pin SOIC package, and compatibility with legacy 74LS logic families.

Technical Context

This device implements four independent D-type latches with edge-triggered clocking and a common active-low asynchronous clear (CLR̅). Each stage provides true and complemented outputs (Q and Q̅), enabling direct use in toggle, enable, or differential bus applications without external inverters.

Triggering occurs on the positive-going transition of the clock input at a defined voltage threshold, not dependent on slew rate. Input setup time (20 ns) and propagation delay (max 25 ns) are specified under 4.75–5.25 V supply and 0°C to 70°C ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.75 V to 5.25 V - ensures stable operation within standard TTL power rail tolerances
Propagation Delay t_pd	25 ns max - defines maximum clock-to-Q timing uncertainty in synchronous systems
Setup Time t_su	20 ns - minimum D-input stability required before clock edge for reliable state capture
Output Drive	–0.4 mA (I_OH) / +8 mA (I_OL) - supports fan-out of up to 20 LS-TTL loads
Static Current I_CC	18 mA typical - determines quiescent power draw in static register configurations
Logic Family	TTL - guarantees interoperability with 74LS, 74S, and 74F series without level shifting

Pinout & Package

SN74LS175NS is housed in a 16-pin plastic small-outline integrated circuit (SOIC) package (NS suffix), with 1.27 mm pitch, 10 mm body width, and surface-mount footprint compatible with JEDEC MS-012.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5	D₀–D₃ Data Inputs	Independent asynchronous data inputs for each of four D-type flip-flops
3, 6, 10, 13	Q₀–Q₃ True Outputs	Registered outputs reflecting stored D-state on positive clock edge
7, 8, 11, 14	Q̅₀–Q̅₃ Complement Outputs	Active-low mirror outputs enabling differential signaling or inverted logic paths
9	CLK Clock Input	Common positive-edge-triggered clock for all four stages
15	CLR̅ Clear Input	Asynchronous active-low reset that forces all Q outputs low regardless of clock state
16	V_CC	Positive supply terminal (4.75–5.25 V)
8	GND	Ground reference for all logic and power connections

Key Features

Feature	Design Value
Quad D-type flip-flops with complementary outputs	Enables compact 4-bit storage with native Q/Q̅ pairs - eliminates need for external inverters in toggle or enable logic
Buffered clock and clear inputs	Reduces loading on driving gates and improves noise immunity on critical control lines
TTL-compatible input/output thresholds	Guarantees interoperability with legacy 74LS/74S logic without interface components
Individual D inputs per stage	Supports independent data loading across all four bits - essential for parallel load register architectures

Applications

Buffer/Storage Registers	Shift Registers
Use Scenario: Holding parallel data from an ADC or microcontroller data bus during processing cycles. IC Role / Device Role / Timing Role: Synchronous 4-bit latch providing temporary data retention synchronized to system clock. Use Value: Eliminates bus contention and enables deterministic read/write timing with 20 ns setup margin.	Use Scenario: Serial-to-parallel conversion in LED matrix drivers or serial communication interfaces. IC Role / Device Role / Timing Role: Four-stage shift register element accepting serial input via cascaded D inputs and clocked output propagation. Use Value: Enables precise bit-aligned shifting with 25 ns max clock-to-Q delay for tight timing budgets.
Pattern Generators	State Machine Controllers
Use Scenario: Generating fixed binary sequences (e.g., 0011, 1010) for test signal injection or waveform synthesis. IC Role / Device Role / Timing Role: Deterministic 4-bit state register feeding combinational logic to produce repeatable output patterns. Use Value: Complementary Q/Q̅ outputs allow direct implementation of XOR-based sequence logic without added gates.	Use Scenario: Encoding finite states in simple control logic for industrial timers or appliance sequencers. IC Role / Device Role / Timing Role: State-holding element in Moore-type machines where next-state logic drives D inputs and CLK advances state. Use Value: Asynchronous CLR̅ allows immediate state reset on fault conditions, improving system safety response.

Buffer/Storage Registers

Shift Registers

Use Scenario: Holding parallel data from an ADC or microcontroller data bus during processing cycles.

IC Role / Device Role / Timing Role: Synchronous 4-bit latch providing temporary data retention synchronized to system clock.

Use Value: Eliminates bus contention and enables deterministic read/write timing with 20 ns setup margin.

Use Scenario: Serial-to-parallel conversion in LED matrix drivers or serial communication interfaces.

IC Role / Device Role / Timing Role: Four-stage shift register element accepting serial input via cascaded D inputs and clocked output propagation.

Use Value: Enables precise bit-aligned shifting with 25 ns max clock-to-Q delay for tight timing budgets.

Pattern Generators

State Machine Controllers

Use Scenario: Generating fixed binary sequences (e.g., 0011, 1010) for test signal injection or waveform synthesis.

IC Role / Device Role / Timing Role: Deterministic 4-bit state register feeding combinational logic to produce repeatable output patterns.

Use Value: Complementary Q/Q̅ outputs allow direct implementation of XOR-based sequence logic without added gates.

Use Scenario: Encoding finite states in simple control logic for industrial timers or appliance sequencers.

IC Role / Device Role / Timing Role: State-holding element in Moore-type machines where next-state logic drives D inputs and CLK advances state.

Use Value: Asynchronous CLR̅ allows immediate state reset on fault conditions, improving system safety response.

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
SN74LS175N	Dual-in-line package (PDIP), same electrical specs and pinout	Through-hole mounting; preferred for prototyping or legacy board assembly	Select SN74LS175N for hand-soldered evaluation or repair of through-hole designs
SN74LS175DR	Same SOIC-16 package as SN74LS175NS but in tape-and-reel (2500-unit reel)	Optimized for automated SMT production; identical timing and drive characteristics	Choose SN74LS175DR for high-volume PCB assembly requiring reel-fed placement

Compared with SN74LS175N and SN74LS175DR, the SN74LS175NS offers identical logic functionality and timing in a SOIC-16 package with tube packaging (20-unit tube), making it ideal for low-volume SMT builds, engineering validation, and replacement in existing SOIC-based systems.

Availability

SN74LS175NS is available at Aetrix Electronics and suitable for buffer/register design, legacy system repair, and educational logic labs requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS175NS 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 SN74LS175NS belongs to TI's legacy 74LS logic family, designed for cost-sensitive, medium-speed digital systems requiring TTL compatibility, predictable timing, and robust noise margins in non-critical applications.

FAQ

What is the function of the CLR̅ pin on the SN74LS175NS?

The CLR̅ (Clear) pin on the SN74LS175NS is an active-low asynchronous reset input. When pulled low, it forces all four Q outputs to logic low immediately-regardless of clock state or D-input values. This function is essential for initializing register states at power-up or recovering from error conditions. The SN74LS175NS requires no clock edge to activate CLR̅, and its behavior is electrically specified across the full 0°C to 70°C temperature range.

Does the SN74LS175NS support mixed-voltage interfacing?

No, the SN74LS175NS operates strictly at 5 V (4.75–5.25 V) and uses TTL input thresholds, so it does not support mixed-voltage interfacing with 3.3 V or lower logic families without level-shifting circuitry. Its input high threshold is ~2.0 V and input low threshold is ~0.8 V, optimized for 5 V TTL systems. Direct connection to 3.3 V CMOS outputs may result in marginal noise margins or unreliable switching, and the SN74LS175NS is not characterized for such operation.

How many clock edges does the SN74LS175NS respond to per cycle?

The SN74LS175NS responds only to the positive-going (rising) edge of the clock signal. It ignores the falling edge and holds output state constant while the clock remains high or low. This single-edge sensitivity ensures deterministic sampling of D-input data, and the SN74LS175NS is tested to meet 20 ns setup and 25 ns max propagation delay specifications under this edge-triggered behavior.

Can the SN74LS175NS be used in place of the SN74LS174?

No-the SN74LS175NS contains four D-type flip-flops with complementary Q/Q̅ outputs per stage, whereas the SN74LS174 is a hex D-type flip-flop with single-rail (Q-only) outputs. They differ in bit count (4 vs. 6), output structure, and pinout. Substituting SN74LS175NS for SN74LS174 would require redesigning output routing and logic, and the SN74LS175NS cannot replicate the 6-bit functionality or pin compatibility of the SN74LS174.

What is the maximum clock frequency supported by the SN74LS175NS?

The SN74LS175NS does not specify a maximum clock frequency in its datasheet; instead, timing is defined by minimum pulse widths and propagation delays. With a 25 ns max t_pd and 20 ns t_su, the practical maximum operating frequency is limited to approximately 12 MHz for reliable operation (assuming equal high/low clock periods and no additional path delays). This value derives directly from the sum of setup and propagation times, and the SN74LS175NS is not characterized beyond this constraint in official TI documentation.

SN74LS175NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

Package/Case:: 16-SOIC (0.209", 5.30mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 1

Number of Bits per Element:: 4

Clock Frequency:: 40 MHz

Max Propagation Delay @ V, Max CL:: 25ns @ 5V, 15pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 400µA, 8mA

Voltage - Supply:: 4.75V ~ 5.25V

Current - Quiescent (Iq):: 18 mA

Input Capacitance:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

SN74LS175NS FAQ

1.How can I place an order for SN74LS175NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS175NS 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 SN74LS175NS reliable?

The price and inventory of SN74LS175NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS175NS is usually 5 days.

3.What payment methods are accepted for SN74LS175NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS175NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS175NS?

SN74LS175NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS175NS 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 SN74LS175NS?

For technical support, including SN74LS175NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS175NS requirements.

6.How does Aetrix verify that SN74LS175NS is sourced from the original manufacturer or authorized distributors?

All SN74LS175NS 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 SN74LS175NS meets industry standards.

7.What is the process for return or replacement of SN74LS175NS?

All SN74LS175NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS175NS, 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 SN74LS175NS part is unused and in its original packaging.

Return procedure for SN74LS175NS:

1.Submit a request within 90 days.

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

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