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HomeProductsIntegrated Circuits (ICs)Logic - Flip FlopsSN74173N
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SN74173N - Texas Instruments

Manufacturer Part Number
SN74173N
Manufacturer
Texas Instruments
Allelco Part Number
32D-SN74173N
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
38,760 pcs available, New & Original
Parts Description
D FLIP-FLOP, 4-BIT, TTL
Package
Bulk
Data sheet
SN74173N.pdf

Datasheets

Datasheet.pdf

HTML Datasheet

Datasheet.pdf
RoHs Status
 
Our certification
In stock: 38760

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Specifications

SN74173N Tech Specifications
Texas Instruments - SN74173N technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74173N

Product Attribute Attribute Value
Manufacturer Texas Instruments
Series *
Product Attribute Attribute Value
Package Bulk
Base Product Number SN74173

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Affected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

SN74173N Image
SN74173N (1)

Manufacturer Part Number

SN74173N

Manufacturer

Texas Instruments

Introduction

The SN74173N is a 4-bit D-type flip-flop with 3-state outputs. It features high-speed operation, low power consumption, and is designed to be used in a wide range of digital logic applications.

Product Features and Performance

4-bit D-type flip-flop with 3-state outputs

High-speed operation with typical propagation delay of 15 ns

Low power consumption with typical ICC of 2 mA

Compatible with TTL and CMOS logic families

Operates from a single 5V power supply

Product Advantages

Versatile and widely applicable in digital logic circuits

Reliable and stable performance

Easy to integrate into existing designs

Key Reasons to Choose This Product

Proven reliability and quality from a trusted manufacturer

Excellent performance-to-cost ratio

Suitable for a wide range of applications, from industrial to consumer electronics

Quality and Safety Features

Rigorous quality control and testing procedures

Compliance with industry safety standards

Compatibility

Compatible with TTL and CMOS logic families

Can be used in a variety of digital logic applications

Application Areas

Digital counters and registers

Memory and data storage

Interface and control circuits

Timing and synchronization applications

Product Lifecycle

The SN74173N is an active and widely used product. Texas Instruments continues to manufacture and support this model. While there may be newer or alternative models available, the SN74173N remains a reliable and widely compatible option for many digital logic applications. If you need assistance with product selection or have questions, please contact our sales team through our website.

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the SN74173N 4-bit D flip-flop that influence timing performance in synchronous digital systems?
The SN74173N, a 4-bit D-type flip-flop from Texas Instruments, exhibits a typical propagation delay (tPHL) of approximately 20 ns and tPLH around 25 ns when operating at VCC = 5 V and TA = 25°C. These delays are critical for determining maximum clock frequency in synchronous designs, as the system must allow sufficient time for input data to stabilize before the next clock edge. The setup and hold times are typically 15 ns and 5 ns respectively under similar conditions, imposing strict timing constraints on source drivers. Engineers must ensure that input signals meet these requirements relative to the rising edge of the clock signal to avoid metastability or incorrect data capture.
How does the Moisture Sensitivity Level (MSL) rating of MSL 3 affect storage and handling procedures for the SN74173N during PCB assembly?
With an MSL 3 classification indicating that the SN74173N begins to degrade after 168 hours of exposure to ambient humidity above 60% RH, it requires controlled storage conditions prior to reflow soldering. Once removed from sealed packaging, the IC should be assembled within this window to prevent moisture-induced defects such as popcorning during thermal stress. Manufacturers typically follow JEDEC J-STD-020 guidelines by baking components if they exceed the floor life limit. This necessitates careful inventory management and traceability throughout production to ensure reliability and yield integrity.
In what scenarios would using the SN74173N be preferable over newer CMOS-based alternatives like the 74HC173?
The SN74173N may still be selected in legacy system upgrades or maintenance projects where existing TTL-compatible logic families are mandated due to board-level compatibility or certification requirements. Its bipolar transistor architecture offers robust noise immunity and faster switching than many early CMOS devices, though at higher power consumption (~20 mA per gate). For applications requiring precise control over drive strength and propagation delay in non-battery-powered environments—such as industrial control interfaces—the SN74173N can offer predictable behavior despite being RoHS non-compliant.
Can the SN74173N operate reliably in automotive environments without additional qualification testing?
While the SN74173N meets standard industrial temperature grades (-40°C to +85°C), it lacks formal automotive AEC-Q100 qualification. Deployment in automotive systems—where extended temperature ranges (-40°C to +125°C), high vibration, and long-term reliability are critical—requires supplemental validation including thermal cycling, electromigration, and functional stress tests beyond datasheet specifications. Designers considering automotive use must either supplement with external protections or select a qualified part number; otherwise, failure risk increases significantly under harsh conditions.
What impact does the non-RoHS status of the SN74173N have on supply chain strategy and regulatory compliance for new product development?
The absence of RoHS compliance means lead and other restricted substances exceed current EU directives unless exemptions apply. Introducing the SN74173N into end products destined for European markets requires either exclusion documentation or redesign using compliant alternatives. This affects procurement planning, cost estimation, and lifecycle management, potentially leading to obsolescence earlier than expected as distributors phase out non-compliant inventories. Forward-looking designs should avoid relying on this part for new developments targeting global distribution channels.
How does the base product number SN74173 relate to the full part number SN74173N, and what implications does this have for cross-referencing?
The "SN74173" denotes the core device family—a 4-bit D flip-flop with common pinout and functionality across manufacturers—while the suffix "N" indicates a plastic dual in-line package (DIP-14). This naming convention aligns with TI’s legacy numbering scheme, where letter codes denote package type, mounting style, or environmental rating. When sourcing equivalents, engineers must verify not only function but also pin configuration and package dimensions, as variations exist between vendors even within the same base number.
Is it feasible to cascade multiple SN74173N flip-flops to create wider shift registers, and what timing challenges arise?
Cascading SN74173N units is possible for building multi-bit shift registers, but cumulative propagation delays compound across stages, limiting usable clock speed. For example, four cascaded SN74173Ns could introduce up to ~100 ns total skew depending on load conditions. Additionally, asynchronous clear paths must be managed carefully to avoid race conditions. Clock distribution networks should minimize jitter and fan-out mismatch to maintain synchronization integrity across the chain—especially problematic in high-speed serial data applications where bit alignment is critical.
What considerations apply when interfacing the SN74173N directly to modern microcontroller I/O pins without level shifting?
Direct connection assumes compatible voltage levels: the SN74173N operates from 4.75 V to 5.25 V, while most microcontrollers output 3.3 V logic. Although some 3.3 V MCUs tolerate 5 V inputs (per datasheet absolute maximum ratings), sustained operation near VIH(min) (~2.0 V) risks marginal noise margins and increased susceptibility to EMI-induced errors. Pull-up resistors or dedicated translators are advisable unless the MCU explicitly supports 5 V tolerant GPIO and the application guarantees clean signal integrity.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74173N

Product Attribute SN74173N SN74174N10 SN74175N SN74170N
Part Number SN74173N SN74174N10 SN74175N SN74170N
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Package Bulk Bulk Bulk -
Base Product Number SN74173 SN74174 SN74175 -
Series * * * -

SN74173N Datasheet PDF

Download SN74173N pdf datasheets and Texas Instruments documentation for SN74173N - Texas Instruments.

Datasheets
Datasheet.pdf
HTML Datasheet
Datasheet.pdf

Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.

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Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
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SN74173N Image

SN74173N

Texas Instruments
32D-SN74173N

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