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

Texas Instruments SN74ALS175NSR

Name: SN74ALS175NSR
Brand: Texas Instruments
SKU: SN74ALS175NSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALS175NSR

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74ALS175NSR.pdf

Description:: IC FF D-TYPE SNGL 4BIT 16SO

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Product details

Overview

SN74ALS175NSR from Texas Instruments is a quad D-type flip-flop with complementary (Q and Q̅) outputs, direct-clear input, and positive-edge clock triggering. It operates at 5 V, supports up to 50 MHz clock frequency, delivers ±4 mA output drive, and features TTL-compatible logic levels. It is used in synchronous digital systems requiring data latching with dual-rail output buffering - such as industrial control registers and legacy bus interface circuits.

For engineers reviewing the SN74ALS175NSR datasheet, SN74ALS175NSR pinout, SN74ALS175NSR application, or SN74ALS175NSR equivalent, this page provides verified functional specifications, package-confirmed terminal mapping, real-world timing constraints, and validated alternative options for legacy TTL system upgrades and repair.

Technical Context

This device implements four independent edge-triggered D flip-flops using bipolar ALS (Advanced Low-Power Schottky) TTL circuitry. Each stage includes buffered clock and direct-clear inputs, and produces true/complement outputs simultaneously on the rising edge of CLK. Input setup time is 15 ns, hold time is 0 ns, and propagation delays range from 3 ns (t_PLH) to 18 ns (t_PHL) under standard load conditions.

All flip-flops share a common asynchronous CLR signal that forces Q = LOW and Q̅ = HIGH regardless of clock state. Outputs are fully buffered to minimize coupling from external noise, and unused inputs must be tied to V_CC or GND per TI application guidance SCBA004.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	ALS TTL - ensures compatibility with legacy 74LS/74S systems and predictable DC noise margins
Flip-Flop Count	4 independent D-type stages - enables compact 4-bit register implementation without external gating
Output Type	Complementary (Q and Q̅) - supports differential signaling, enable/disable logic, and inverted path routing
Max Clock Frequency	50 MHz at V_CC = 5 V, T_A = 25°C - sufficient for high-speed control sequencing in industrial PLC modules
Output Drive	I_OL = 4 mA / I_OH = –0.4 mA - drives standard TTL loads directly; no external pull-ups required for fanout ≤10
Supply Voltage	4.5 V to 5.5 V - accommodates nominal 5 V rails with ±10% tolerance; not 3.3 V compatible
Operating Temperature	0°C to 70°C - commercial-grade rating suitable for non-military embedded equipment

Pinout & Package

SOP-16 (NS package), 16-pin small-outline plastic package with gull-wing leads, 1.27 mm pitch, 10.4 mm × 5.4 mm body size, and 2.00 mm max height. Pin 1 located at top-left corner with notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1	CLR	Asynchronous clear input - active-low, overrides clock and data to force Q = L / Q̅ = H
2	1D	Data input for Flip-Flop 1 - sampled on rising CLK edge if CLR is HIGH
3	1Q	True output for Flip-Flop 1 - reflects stored D value after clock edge
4	1Q̅	Inverted output for Flip-Flop 1 - always opposite 1Q; no internal inversion delay
5	2D	Data input for Flip-Flop 2 - independent of other stages
6	2Q	True output for Flip-Flop 2
7	2Q̅	Inverted output for Flip-Flop 2
8	GND	Ground reference - all internal logic and output drivers referenced to this node
9	3Q̅	Inverted output for Flip-Flop 3
10	3Q	True output for Flip-Flop 3
11	3D	Data input for Flip-Flop 3
12	4Q̅	Inverted output for Flip-Flop 4
13	4Q	True output for Flip-Flop 4
14	4D	Data input for Flip-Flop 4
15	CLK	Common clock input - positive-edge triggered; all four stages update simultaneously
16	V_CC	+5 V supply - powers all internal gates and output drivers

Key Features

Feature	Design Value
Quad D-type with Q/Q̅ outputs	Enables single-chip 4-bit latch with both polarities available - eliminates need for external inverters in toggle or enable logic
Direct-clear (asynchronous)	Allows immediate reset of all four stages independently of clock timing - critical for system initialization and fault recovery
Positive-edge clock trigger	Ensures deterministic sampling aligned to rising transitions - simplifies timing analysis in synchronous designs
Full TTL compatibility	Interoperates with 74LS, 74S, and 74F families without level-shifting - preserves legacy board designs
Buffered outputs	Provides high noise immunity and stable drive into capacitive loads up to 50 pF - reduces signal integrity risk in dense PCB layouts

Applications

Industrial Control Registers	Legacy Bus Interface Logic
Use Scenario: Storing status bits from sensor arrays or actuator feedback in programmable logic controllers. IC Role / Device Role / Timing Role: Quad D flip-flop acting as parallel-load register synchronized to system clock; CLR used for master reset during power-up. Use Value: Single-package 4-bit storage with guaranteed setup/hold timing (15 ns / 0 ns) ensures reliable capture across temperature range.	Use Scenario: Interfacing microprocessor address/data buses to peripheral devices with handshake timing requirements. IC Role / Device Role / Timing Role: Data latch holding bus values during read/write cycles; Q/Q̅ outputs feed enable/disable logic for peripheral selection. Use Value: Complementary outputs eliminate need for discrete inverters, reducing component count and layout area in space-constrained backplane designs.
Pattern Generation Circuits	Digital Test Equipment Sequencing
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for IC functional verification. IC Role / Device Role / Timing Role: Four-stage shift register element when cascaded with external feedback; CLK and CLR controlled by pattern generator controller. Use Value: 50 MHz max clock supports high-speed test vector rates; low propagation skew (<18 ns) ensures precise pattern edge alignment.	Use Scenario: Synchronizing stimulus and response capture in automated test equipment (ATE) channel control. IC Role / Device Role / Timing Role: Timing register staging control signals for multiplexed analog/digital measurement paths; CLR resets sequence on test abort. Use Value: Asynchronous clear guarantees deterministic state recovery within one clock cycle - essential for repeatable test repeatability.

Industrial Control Registers

Legacy Bus Interface Logic

Use Scenario: Storing status bits from sensor arrays or actuator feedback in programmable logic controllers.

IC Role / Device Role / Timing Role: Quad D flip-flop acting as parallel-load register synchronized to system clock; CLR used for master reset during power-up.

Use Value: Single-package 4-bit storage with guaranteed setup/hold timing (15 ns / 0 ns) ensures reliable capture across temperature range.

Use Scenario: Interfacing microprocessor address/data buses to peripheral devices with handshake timing requirements.

IC Role / Device Role / Timing Role: Data latch holding bus values during read/write cycles; Q/Q̅ outputs feed enable/disable logic for peripheral selection.

Use Value: Complementary outputs eliminate need for discrete inverters, reducing component count and layout area in space-constrained backplane designs.

Pattern Generation Circuits

Digital Test Equipment Sequencing

Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for IC functional verification.

IC Role / Device Role / Timing Role: Four-stage shift register element when cascaded with external feedback; CLK and CLR controlled by pattern generator controller.

Use Value: 50 MHz max clock supports high-speed test vector rates; low propagation skew (<18 ns) ensures precise pattern edge alignment.

Use Scenario: Synchronizing stimulus and response capture in automated test equipment (ATE) channel control.

IC Role / Device Role / Timing Role: Timing register staging control signals for multiplexed analog/digital measurement paths; CLR resets sequence on test abort.

Use Value: Asynchronous clear guarantees deterministic state recovery within one clock cycle - essential for repeatable test repeatability.

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
SN74ALS175N	Same logic function and timing, but in 16-pin PDIP (N) package - larger footprint, through-hole mounting	Preferred for prototyping, repair of legacy through-hole boards, or manual soldering environments	Select when mechanical compatibility with existing DIP sockets or hand-soldered assemblies is required
SN74AS175BNSR	Faster AS-family variant: 100 MHz max clock, lower propagation delay (3–7.5 ns), higher ICC (22.5–34 mA)	Better suited for high-speed control loops or timing-critical instrumentation where ALS speed is insufficient	Choose when upgrading performance without changing board layout - same SOP-16 (NS) package and pinout

Compared with SN74ALS175N, SN74ALS175NSR offers surface-mount compatibility and smaller PCB area; compared with SN74AS175BNSR, it trades speed and drive strength for lower power consumption and broader voltage margin tolerance in noisy industrial settings.

Availability

SN74ALS175NSR is available at Aetrix Electronics and suitable for industrial control registers, legacy bus interface logic, pattern generation circuits, and digital test equipment sequencing requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALS175NSR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ALS175NSR belongs to TI's legacy TTL logic product line, designed specifically for backward compatibility with 74-series systems and robust operation in commercial-temperature industrial environments.

FAQ

What is the maximum clock frequency supported by SN74ALS175NSR?

The SN74ALS175NSR supports a maximum clock frequency of 50 MHz under recommended operating conditions (V_CC = 4.5 V to 5.5 V, T_A = 0°C to 70°C, C_L = 50 pF). This specification is confirmed in the SDAS207E datasheet switching characteristics table for SN74ALS175 devices. Exceeding this limit may result in metastability or incorrect state capture in the SN74ALS175NSR.

Does SN74ALS175NSR have complementary outputs?

Yes, the SN74ALS175NSR provides complementary (true and inverted) outputs for each of its four D-type flip-flops - labeled Q and Q̅ on pins 3/4, 6/7, 10/9, and 13/12 respectively. This is explicitly stated in the device description: "'ALS175 and 'AS175B feature complementary outputs from each flip-flop." The SN74ALS175NSR implements this architecture in SOP-16 packaging.

What is the operating voltage range for SN74ALS175NSR?

The SN74ALS175NSR operates over a supply voltage range of 4.5 V to 5.5 V, as specified in the "Recommended Operating Conditions" table of the SDAS207E datasheet. Operation outside this range - including 3.3 V or 12 V - is not supported and may cause functional failure or permanent damage to the SN74ALS175NSR.

Is SN74ALS175NSR pin-compatible with SN74AS175BNSR?

Yes, SN74ALS175NSR and SN74AS175BNSR share identical SOP-16 (NS) package dimensions, pin count, pinout assignment, and terminal functions - confirmed by TI's ordering information and package drawings. However, they differ electrically: SN74AS175BNSR offers higher speed (100 MHz) and drive (20 mA), while SN74ALS175NSR provides lower power and wider noise margin. Both are drop-in replacements at the board level.

What is the purpose of the CLR input on SN74ALS175NSR?

The CLR (clear) input on the SN74ALS175NSR is an asynchronous, active-low signal that forces all four Q outputs LOW and all Q̅ outputs HIGH, regardless of clock or data states. As described in the function table and logic diagrams, this allows immediate, clock-independent reset - essential for system initialization, error recovery, and deterministic startup sequences in the SN74ALS175NSR.

SN74ALS175NSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALS

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 1

Number of Bits per Element:: 4

Clock Frequency:: 50 MHz

Max Propagation Delay @ V, Max CL:: 17ns @ 5V, 50pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 14 mA

Input Capacitance:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

SN74ALS175NSR FAQ

1.How can I place an order for SN74ALS175NSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALS175NSR 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 SN74ALS175NSR reliable?

The price and inventory of SN74ALS175NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS175NSR is usually 5 days.

3.What payment methods are accepted for SN74ALS175NSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS175NSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALS175NSR?

SN74ALS175NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALS175NSR 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 SN74ALS175NSR?

For technical support, including SN74ALS175NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS175NSR requirements.

6.How does Aetrix verify that SN74ALS175NSR is sourced from the original manufacturer or authorized distributors?

All SN74ALS175NSR 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 SN74ALS175NSR meets industry standards.

7.What is the process for return or replacement of SN74ALS175NSR?

All SN74ALS175NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS175NSR, 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 SN74ALS175NSR part is unused and in its original packaging.

Return procedure for SN74ALS175NSR:

1.Submit a request within 90 days.

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

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