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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversSN75ALS181NSR
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SN75ALS181NSR - Texas Instruments

Manufacturer Part Number
SN75ALS181NSR
Manufacturer
Texas Instruments
Allelco Part Number
32D-SN75ALS181NSR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
21,187 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 1/1 14SOP
Package
14-SO
Data sheet
SN75ALS181NSR.pdf

PCN Design/Specification

Mult Dev 1/Nov/2022.pdf

HTML Datasheet

SN75ALS181.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 21187
  • Unit Price: $1.603
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.603 $1.60
10+ $1.394 $13.94
30+ $1.264 $37.92
100+ $1.129 $112.90
500+ $1.069 $534.50
1000+ $1.042 $1,042.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

SN75ALS181NSR Tech Specifications
Texas Instruments - SN75ALS181NSR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN75ALS181NSR

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 14-SO
Series -
Receiver Hysteresis 60 mV
Protocol RS422, RS485
Package / Case 14-SOIC (0.209", 5.30mm Width)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature 0°C ~ 70°C
Number of Drivers/Receivers 1/1
Mounting Type Surface Mount
Duplex Full
Data Rate -
Base Product Number 75ALS181

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

SN75ALS181NSR Image
SN75ALS181NSR (1)

Manufacturer Part Number

SN75ALS181NSR

Manufacturer

Texas Instruments

Introduction

The SN75ALS181NSR is a full-duplex RS422/RS485 transceiver from Texas Instruments, designed to manage communication in high-speed networks.

Product Features and Performance

Transceiver for RS422, RS485 protocols

Supports 1 Driver and 1 Receiver

Full-duplex communication

Receiver Hysteresis: 60 mV

Operates with a supply voltage of 4.75V to 5.25V

Designed for surface mount technology

Product Advantages

Ensures reliable data transmission over RS422 or RS485 protocols

Integrated receiver hysteresis enhances noise immunity

Compatibility with a wide range of industrial applications due to its operating temperature range

Promotes easy integration into designs due to its SMT mounting

Key Technical Parameters

Supply Voltage: 4.75V ~ 5.25V

Operating Temperature Range: 0°C ~ 70°C

Mounting Type: Surface Mount

Package / Case: 14-SOIC

Full-duplex RS422, RS485 communication

Quality and Safety Features

Manufactured by Texas Instruments, ensuring high reliability and performance

Compatibility

Compatible with RS422 and RS485 communication standards, suitable for digital network communications

Application Areas

Industrial control systems

Networking equipment

Data acquisition systems

Product Lifecycle

Classified as "Last Time Buy" suggesting imminent discontinuation

Customers should seek replacements or upgrades soon

Several Key Reasons to Choose This Product

Highly reliable for industrial communications due to adherence to RS422 and RS485 standards

Full-duplex capability allows for simultaneous send and receive operations

Low operating voltage and integrated hysteresis offer enhanced performance and noise immunity

Manufactured by trusted industry leader Texas Instruments

Supports a broad temperature range, making it suitable for various operating environments

Alert on product lifecycle encourages timely transition planning

Frequently Asked Questions(FAQ)

How does the SN75ALS181NSR handle noise immunity in industrial environments where electromagnetic interference is significant?
The SN75ALS181NSR incorporates a receiver hysteresis of 60 mV, which enhances noise rejection by providing a defined threshold margin between valid logic states. In typical RS422/RS485 differential signaling applications operating over long cables—such as those exceeding 30 meters—this hysteresis helps prevent false triggering due to common-mode noise or signal degradation. When deployed in environments with high EMI, such as motor drives or power electronics, the 60 mV threshold ensures stable data reception even when the differential input voltage approaches the switching point.
What are the key differences between the SN75ALS181NSR and THVD1552DR in terms of voltage tolerance and fault protection?
While both devices support RS422 and RS485 communication, the THVD1552DR offers extended supply voltage operation up to 5.5 V and includes integrated ±15 kV IEC ESD protection on all pins, making it more suitable for harsh industrial installations. In contrast, the SN75ALS181NSR operates strictly within a 4.75 V to 5.25 V range and provides only basic ESD protection. For designs requiring higher noise immunity at the physical layer and compatibility with systems powered near 5 V but subject to transient events, the THVD1552DR presents a more robust alternative.
Can the SN75ALS181NSR be used reliably in automotive-grade temperature ranges, or is its 0°C to 70°C rating too restrictive?
The SN75ALS181NSR is rated for commercial temperature operation from 0°C to 70°C, which aligns with standard industrial control panels and building automation systems. However, this range excludes most automotive applications that require AEC-Q100 qualification and wider thermal margins (-40°C to +125°C). While it may function temporarily in automotive infotainment subsystems not exposed to extreme ambient swings, long-term reliability under engine bay conditions or cold-start scenarios cannot be guaranteed without additional thermal management or derating.
What is the maximum cable length recommended when using the SN75ALS181NSR for full-duplex RS422 communication at 10 Mbps?
At 10 Mbps, the SN75ALS181NSR can reliably drive RS422 lines up to approximately 120 meters over twisted-pair cable, assuming AWG 24 or heavier conductors and proper termination. Beyond this distance, signal attenuation and intersymbol interference increase significantly. Practical implementations often limit runs to 100 meters at 10 Mbps due to connector losses and ground loops. For longer distances, reducing the data rate below 1 Mbps enables cable lengths exceeding 1 kilometer.
Does the SN75ALS181NSR support hot-plugging in multi-drop networks without risking damage to connected nodes?
No, the SN75ALS181NSR lacks built-in hot-plug protection circuits. Connecting or disconnecting transceivers while power is applied can induce voltage spikes on the bus lines, potentially exceeding the absolute maximum ratings of the device. To mitigate this risk, designers should implement series current-limiting resistors (typically 100–470 Ω) and consider using external TVS diodes rated for ±15 V clamping. Alternatively, selecting a transceiver with IEC 61000-4-2 compliance—like the THVD1552DR—is advisable for plug-and-play deployments.
How does the power consumption profile of the SN75ALS181NSR compare to modern low-power RS485 transceivers like the MAX13487E?
The SN75ALS181NSR draws typical quiescent current around 1.2 mA per channel under 5 V supply, resulting in roughly 12 mA total for full-duplex operation. In contrast, the MAX13487E consumes only about 100 µA in shutdown mode and 3.5 mA during active transmission. For battery-powered sensor networks or energy-sensitive embedded systems, this difference becomes critical. The SN75ALS181NSR remains appropriate for always-on industrial gateways but offers no sleep modes or automatic shutdown features.
Is it acceptable to use the SN75ALS181NSR in a half-duplex configuration despite being specified as full-duplex?
Yes, the SN75ALS181NSR can operate effectively in half-duplex mode by simply tying the DE and RE pins together and toggling them appropriately. However, because the driver and receiver share the same differential pair, switching delays must be carefully managed to avoid bus contention. The device’s slew-rate-controlled drivers help minimize reflections, but proper PCB layout with impedance-matched traces and termination resistors remains essential to maintain signal integrity during direction changes.
What precautions should be taken when soldering the SN75ALS181NSR due to its Moisture Sensitivity Level (MSL) rating?
The SN75ALS181NSR has an MSL rating of 1, indicating unlimited shelf life under storage conditions of <40°C and <80% relative humidity. As such, it does not require baking prior to reflow soldering unless stored outside these limits for extended periods. Nevertheless, following standard IPC/JEDEC J-STD-033 guidelines for handling moisture-sensitive devices is recommended. Avoid prolonged exposure to humid environments before assembly, and use desiccant packaging during transport if the board will undergo multiple production cycles.
How does the 14-SOIC package of the SN75ALS181NSR affect thermal performance in dense PCB layouts?
The 14-pin SOIC (5.3 mm width) package has limited exposed thermal dissipation capability compared to QFN or larger SO packages. Under continuous full-load operation at 5 V, junction temperatures may rise by 15–20°C above ambient depending on copper pour area and airflow. In most RS422/RS485 applications, however, the power dissipation is low enough that passive cooling suffices. Still, in high-node-count systems where multiple transceivers share a plane, ensure adequate ground-plane stitching and keep traces short to reduce parasitic capacitance and inductive ringing.
Can the SN75ALS181NSR interface directly with 3.3 V microcontrollers without level shifting?
The SN75ALS181NSR accepts TTL-compatible inputs down to 2.0 V minimum, which comfortably accommodates 3.3 V logic levels from modern MCUs. However, the output swing is rail-to-rail only when powered from ≥4.75 V; thus, if the MCU operates at 3.3 V while the transceiver uses a 5 V supply, the logic high from the MCU may fall below the guaranteed VIH(min) of the SN75ALS181NSR. To guarantee reliable operation, either use a 5 V microcontroller or insert a small pull-up resistor on the input pin to ensure sufficient overdrive margin.
What impact does supply voltage ripple have on the SN75ALS181NSR’s receiver sensitivity?
Within its specified 4.75 V to 5.25 V range, the SN75ALS181NSR maintains consistent receiver thresholds (±200 mV nominal for RS485). However, large supply transients or poor decoupling can introduce ground bounce and coupling into the analog front end, degrading CMRR and increasing bit error rates. It is strongly recommended to place a 0.1 µF ceramic capacitor as close as possible to the VCC pin and another bulk capacitor (e.g., 10 µF tantalum) near the board’s power entry point. This minimizes PSRR degradation and ensures stable operation under dynamic load conditions.
Are there any known limitations regarding common-mode voltage range when using the SN75ALS181NSR over ground-potential gradients?
The SN75ALS181NSR supports a common-mode voltage range of −7 V to +12 V for receivers, allowing operation in systems with significant ground offsets—a key advantage for long-distance RS485 networks. However, this assumes proper isolation or balanced current paths. If the ground potential difference exceeds 12 V continuously, damage may occur regardless of the −7 V to +12 V specification, which applies only under transient conditions. For installations spanning facilities with separate grounding systems, opt for isolated transceivers or add galvanic isolation modules to protect against sustained offset voltages.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN75ALS181NSR

Product Attribute SN75ALS181NSRG4 SN75ALS181NSE4 SN75ALS191DRG4 SN75ALS191PS
Part Number SN75ALS181NSRG4 SN75ALS181NSE4 SN75ALS191DRG4 SN75ALS191PS
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Protocol - - - -
Data Rate - - - -
Number of Drivers/Receivers - - - -
Voltage - Supply - - - -
Receiver Hysteresis - - - -
Duplex - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Base Product Number - DAC34H84 MAX500 ADS62P42
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Type - - - -

SN75ALS181NSR Datasheet PDF

Download SN75ALS181NSR pdf datasheets and Texas Instruments documentation for SN75ALS181NSR - Texas Instruments.

PCN Packaging
Carrier Tape Revision C 09/Apr/2015.pdf Carrier Tape Update 23/Feb/2015.pdf
PCN Design/Specification
Mult Dev 1/Nov/2022.pdf
HTML Datasheet
SN75ALS181.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • 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.

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SN75ALS181NSR Image

SN75ALS181NSR

Texas Instruments
32D-SN75ALS181NSR

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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