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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversMAX3291ESD+T
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MAX3291ESD+T - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX3291ESD+T
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX3291ESD+T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,412 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 1/1 14SOIC
Package
14-SOIC
Data sheet
MAX3291ESD+T.pdf

Datasheets

MAX3291,92.pdf

Part Numbering Guide

Part Numbering System.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 6412
  • Unit Price: $6.086
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $6.086 $6.09
200+ $2.356 $471.20
500+ $2.273 $1,136.50
1000+ $2.232 $2,232.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

MAX3291ESD+T Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX3291ESD+T technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX3291ESD+T

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 14-SOIC
Series -
Receiver Hysteresis 35 mV
Protocol RS422, RS485
Package / Case 14-SOIC (0.154", 3.90mm Width)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C
Number of Drivers/Receivers 1/1
Mounting Type Surface Mount
Duplex Full
Data Rate 10Mbps
Base Product Number MAX3291

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

MAX3291ESD+T Image
MAX3291ESD+T (1)

Manufacturer Part Number

MAX3291ESD+T

Manufacturer

Maxim Integrated

Introduction

The MAX3291 is a high-speed, full-duplex, RS-422/RS-485 transceiver that operates from a single 5V supply. It features ESD protection, common-mode voltage range, and enables automatic shutdown.

Product Features and Performance

Full-duplex, high-speed RS-422/RS-485 transceiver

Operates from a single 5V supply

ESD protection on all pins

Wide common-mode voltage range

Automatic shutdown on loss of driver enable

Data rates up to 10Mbps

35mV receiver hysteresis

Product Advantages

Robust ESD protection for high reliability

Wide common-mode voltage range for compatibility

Automatic shutdown feature for power savings

High-speed data rates for fast communication

Key Technical Parameters

Operating voltage: 4.75V to 5.25V

Operating temperature: -40°C to 85°C

Data rate: Up to 10Mbps

Receiver hysteresis: 35mV

Quality and Safety Features

RoHS3 compliant

14-SOIC surface mount package

Compatibility

Supports RS-422 and RS-485 protocols

Application Areas

Industrial control systems

Building automation

Instrumentation and measurement equipment

Transportation systems

Product Lifecycle

The MAX3291 is an active product and is not nearing discontinuation.

Replacement or upgrade options are available from Maxim Integrated.

Key Reasons to Choose This Product

Robust ESD protection for high reliability

Wide common-mode voltage range for compatibility

Automatic shutdown feature for power savings

High-speed data rates for fast communication

RoHS3 compliance for environmental responsibility

Frequently Asked Questions(FAQ)

How does the MAX3291ESD+T perform in noisy industrial environments requiring reliable RS485 communication over long distances?
The MAX3291ESD+T features 35 mV of receiver hysteresis, which provides a robust noise margin against common-mode voltage fluctuations typical in industrial settings. This hysteresis helps prevent false triggering from electromagnetic interference (EMI) and ground potential differences. Combined with its full-duplex RS485 protocol support and 10 Mbps data rate capability, the device is well-suited for high-speed serial communications across multi-drop networks spanning hundreds of meters. Its 4.75V to 5.25V supply range ensures compatibility with standard 5V digital logic systems commonly used in embedded control applications.
What are the key differences between the MAX3291ESD+T and similar full-duplex transceivers like the MAX3485 or MAX3081 when selecting for a low-power industrial sensor network?
Unlike the MAX3485, which operates as a half-duplex transceiver, the MAX3291ESD+T supports full-duplex communication, enabling simultaneous transmit and receive operations—critical for point-to-point or daisy-chain topologies requiring bidirectional data flow at full bandwidth. Additionally, the MAX3291ESD+T achieves up to 10 Mbps data rates compared to the MAX3485’s typical 2.5 Mbps limit, making it more suitable for high-speed applications. While both devices operate within similar supply voltage ranges (5V ±10%), the MAX3291’s higher speed and full-duplex capability come at a trade-off in power consumption, which may be a consideration in battery-powered deployments.
Can the MAX3291ESD+T be used in automotive-grade applications requiring extended temperature ranges and enhanced ESD protection?
No, the MAX3291ESD+T is rated for operation from -40°C to +85°C and is housed in a 14-SOIC package with an integrated ESD diode structure designed for basic electrostatic discharge protection. However, it does not meet AEC-Q100 qualification standards required for automotive-grade components. For automotive applications demanding wider temperature ranges (-40°C to +125°C) and higher immunity to transient surges, alternative devices such as the MAXM14850 or MAX3421EAE+ should be considered due to their automotive qualification and superior robustness.
Is the MAX3291ESD+T compatible with 3.3V logic levels, or does it require a dedicated level-shifting solution?
The MAX3291ESD+T operates from a 4.75V to 5.25V supply range, meaning its internal drivers and receivers are optimized for 5V signaling. When interfacing with 3.3V microcontroller GPIOs, direct connection may result in marginal signal integrity and potential reliability concerns due to insufficient input thresholds. A dedicated voltage-level translator or a transceiver with 3.3V-compatible I/O would be preferable unless the system includes a regulated 5V rail for peripheral support. Alternatively, some microcontrollers can tolerate 5V-tolerant inputs, but this depends on specific pin configurations and must be verified in the datasheet.
What impact does the 35 mV receiver hysteresis of the MAX3291ESD+T have on noise immunity in RS485 differential signaling?
The 35 mV hysteresis introduces intentional threshold separation between rising and falling edge detection, reducing susceptibility to noise spikes near the switching point. In typical RS485 systems where differential signals swing ±1.5V to ±5V, this 35 mV difference effectively filters out minor glitches caused by crosstalk or ground bounce. However, excessive hysteresis can lead to degraded signal fidelity at very high speeds; thus, the MAX3291ESD+T balances noise rejection with timing accuracy, maintaining reliable operation up to 10 Mbps in electrically noisy environments.
How many nodes can be supported on a single bus using the MAX3291ESD+T in a multi-drop RS485 configuration?
The MAX3291ESD+T is designed for point-to-point or short-drop RS485 links rather than large multi-drop networks. Due to its lack of built-in driver enable (DE) and receiver enable (RE) pins in a simplified configuration, it cannot easily support half-duplex multi-drop topologies without external control logic. Furthermore, RS485 standards recommend limiting the number of receivers to 32 per bus to maintain proper termination and impedance matching. Given these constraints, the MAX3291ESD+T is best suited for full-duplex point-to-point communication rather than complex network architectures.
Does the MAX3291ESD+T require external termination resistors, and how do they affect performance?
Yes, the MAX3291ESD+T requires external termination resistors at both ends of the transmission line to prevent signal reflections that degrade data integrity, especially at its 10 Mbps operating speed. For RS485 differential lines, 120Ω resistors are typically placed in parallel across the A and B signal lines. These terminations match the characteristic impedance of standard twisted-pair cables (e.g., Belden 9841), ensuring clean signal transitions. Without proper termination, bit errors increase significantly beyond approximately 10 meters, particularly at high data rates.
What precautions should be taken when routing traces for the MAX3291ESD+T to ensure signal integrity in a high-speed PCB layout?
To preserve signal integrity, differential pairs (A/B outputs) should be routed with controlled impedance (typically 120Ω differential) and matched trace lengths. The MAX3291ESD+T drives RS485 signals capable of 10 Mbps, so rise/fall times must remain under 40 ns to avoid intersymbol interference. Keep these traces away from noisy digital lines such as clock generators or switching regulators. Also, minimize stubs and use series termination close to the driver output if needed. The 14-SOIC footprint allows compact placement, but decoupling capacitors (0.1 µF ceramic) must be placed within 5 mm of VCC and GND pins to suppress power supply noise.
How does the MAX3291ESD+T compare to the MAX3290 in terms of electrical characteristics and application suitability?
Both the MAX3291ESD+T and MAX3290 are full-duplex RS422/RS485 transceivers, but the MAX3291ESD+T offers higher data rate capability (10 Mbps vs. 2.5 Mbps for MAX3290) and slightly improved receiver hysteresis (35 mV vs. 20 mV). The MAX3291 also has a broader operating temperature range (-40°C to +85°C) matching industrial requirements, while the MAX3290 may have tighter specs depending on revision. The MAX3291ESD+T’s higher speed makes it more appropriate for real-time control systems, whereas the MAX3290 might suffice for slower sensor polling applications. Package and pinout compatibility further ease migration between designs.
Can the MAX3291ESD+T be powered directly from a USB 2.0 5V rail, and what are the implications for system design?
Yes, the MAX3291ESD+T can be powered directly from a regulated 5V USB 2.0 supply since its operating voltage range (4.75V to 5.25V) aligns closely with USB specifications. However, USB ports may experience voltage drops under load, so verifying stable operation during peak data transmission is advisable. Additionally, adding bulk capacitance (e.g., 10 µF tantalum + 0.1 µF ceramic) near the IC helps filter transient currents during fast edge transitions. Care must also be taken to avoid back-powering the USB port if other circuits share the same rail, potentially violating USB host guidelines.
What is the significance of the MSL rating being Level 1 for the MAX3291ESD+T, and how does it affect handling during manufacturing?
An Moisture Sensitivity Level (MSL) of 1 indicates that the MAX3291ESD+T is not sensitive to moisture absorption and can be stored indefinitely under normal conditions without baking before assembly. This simplifies supply chain logistics and reduces post-bake requirements in high-volume production. Manufacturers can handle Tape & Reel (TR) packaged parts immediately after opening, provided soldering occurs within the recommended time frame (typically 168 hours at <30% RH). This attribute enhances process flexibility and reduces downtime in SMT lines.
Are there any known limitations when using the MAX3291ESD+T in hot-swap or live insertion scenarios?
The MAX3291ESD+T lacks built-in hot-swap protection circuitry, making it vulnerable to inrush current and voltage overshoot during live board insertion. Without series resistance on the supply line or clamping diodes, sudden connection to a powered bus can stress internal ESD structures. In such applications, adding a 1–10 Ω resistor in series with VCC and using TVS diodes on the RS485 lines are recommended mitigations. Alternatively, devices with integrated hot-swap control (e.g., MAX3295) should be evaluated for safer plug-and-play operation.
How does the MAX3291ESD+T support fault detection, and what role does receiver hysteresis play in identifying invalid states?
The MAX3291ESD+T does not include advanced diagnostics like open-circuit detection or short-to-ground alerts found in newer transceivers. Instead, its 35 mV hysteresis improves tolerance to floating inputs or unterminated lines by preventing oscillation near threshold voltages. If the receiver input exceeds valid common-mode range (±7V max), the output defaults to a known state (usually high), aiding fail-safe operation. Designers should implement software-based timeout mechanisms in the MCU to detect stalled communication, as hardware-level error reporting is limited.
What are the thermal considerations when deploying multiple MAX3291ESD+T devices on a densely populated PCB?
Although the MAX3291ESD+T consumes minimal power (typically <1 mA in sleep mode and ~5 mA active), placing several units in close proximity may elevate local junction temperatures under continuous 10 Mbps operation. The SOIC package has a θJA of approximately 100°C/W, so airflow and copper pour area around the IC help dissipate heat. In extreme cases, derating the maximum ambient temperature or spacing components adequately prevents thermal coupling. Monitoring VCC ripple and ensuring good decoupling further stabilizes performance under sustained load.
Can the MAX3291ESD+T interface with PROFIBUS or Modbus RTU protocols, and what modifications are required?
Yes, the MAX3291ESD+T physically supports RS485 differential signaling compatible with PROFIBUS DP and Modbus RTU layers. However, protocol implementation resides entirely in the microcontroller firmware. Users must configure UART baud rates (up to 10 Mbps), parity settings, and message framing according to protocol specifications. Since Modbus RTU requires precise timing and PROFIBUS uses token passing, additional logic may be needed for bus arbitration and collision avoidance—especially in half-duplex modes not natively supported by the MAX3291ESD+T.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX3291ESD+T

Product Attribute MAX3291CSD+T MAX3291ESD+ MAX3292ESD+ MAX3291EPD+
Part Number MAX3291CSD+T MAX3291ESD+ MAX3292ESD+ MAX3291EPD+
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Protocol - - - -
Receiver Hysteresis - - - -
Type - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Data Rate - - - -
Duplex - - - -
Number of Drivers/Receivers - - - -
Voltage - Supply - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

MAX3291ESD+T Datasheet PDF

Download MAX3291ESD+T pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX3291ESD+T - Analog Devices Inc./Maxim Integrated.

Datasheets
MAX3291,92.pdf
Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf
Part Numbering Guide
Part Numbering System.pdf
Application Notes
Pre-Emphasis Improves RS-485 Communications.pdf

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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MAX3291ESD+T Image

MAX3291ESD+T

Analog Devices Inc./Maxim Integrated
32D-MAX3291ESD+T

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

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