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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversMAX3440EESA+T
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MAX3440EESA+T - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX3440EESA+T
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX3440EESA+T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,193 pcs available, New & Original
Parts Description
IC TRANSCEIVER HALF 1/1 8SOIC
Package
8-SOIC
Data sheet
MAX3440EESA+T.pdf

Datasheets

MAX3440E-44E.pdf

Part Numbering Guide

Part Numbering System.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 9193
  • Unit Price: $9.534
  • Subtotal: $0.00

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1+ $9.534 $9.53
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

MAX3440EESA+T Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX3440EESA+T technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX3440EESA+T

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 8-SOIC
Series -
Receiver Hysteresis 25 mV
Protocol RS422, RS485
Package / Case 8-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 Half
Data Rate 250kbps
Base Product Number MAX3440

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

MAX3440EESA+T Image
MAX3440EESA+T (1)

Manufacturer Part Number

MAX3440EESA+T

Manufacturer

Analog Devices

Introduction

The MAX3440EESA+T is a robust RS422/RS485 half-duplex transceiver designed for digital communication and transmission systems.

Product Features and Performance

Transceiver Type: RS422, RS485

Data Rate: 250kbps

Half-duplex communication support

Receiver Hysteresis: 25 mV

Supports up to 1 Driver and 1 Receiver

Voltage Supply Range: 4.75V to 5.25V

Product Advantages

High data integrity and signal quality

Minimal external components required

Protected against Voltage spikes and surges

Key Technical Parameters

Number of Drivers/Receivers: 1/1

Operating Temperature: -40°C to 85°C

Protocol Supported: RS422, RS485

Mounting Type: Surface Mount

Package: 8-SOIC

Quality and Safety Features

ESD protected

Thermal shutdown protection

Short-circuit protection for driver and receiver

Compatibility

Compatible with other RS422 and RS485 interfaces

Utilizes standard 8-SOIC package for easy integration

Application Areas

Industrial Automation

Building Automation

Data communication systems

Networked devices control

Product Lifecycle

Product Status: Active

Not nearing discontinuation

Updates and replacements available

Several Key Reasons to Choose This Product

Reliable performance in a wide operating temperature range

Robust against electromagnetic interference and voltage variations

Low power consumption and high data rate capability

Ensures Safety and stability in various system environments

Optimized for long lifecycle and sustaining field deployment

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the MAX3440EESA+T transceiver that affect signal integrity in half-duplex RS-485 networks?
The MAX3440EESA+T operates with a 25 mV receiver hysteresis, which enhances noise immunity by providing a defined threshold window for valid logic transitions. This is particularly important in electrically noisy industrial environments where common-mode noise can otherwise cause false triggering. With a data rate of 250 kbps and a supply voltage range of 4.75V to 5.25V, the device maintains reliable communication over typical twisted-pair cabling up to several hundred meters. The 1/1 driver/receiver configuration supports single-point termination and simplifies node addressing in multi-drop topologies.
How does the MAX3440EESA+T compare to other RS-485 transceivers like the MAX3485 or MAX485 in terms of power consumption and noise performance?
While the MAX3440EESA+T shares similar voltage and temperature specifications with the MAX485 and MAX3485, it differentiates itself through its 25 mV receiver hysteresis—higher than the standard 16 mV of many basic transceivers—resulting in better noise rejection without sacrificing sensitivity. Unlike lower-cost alternatives, the MAX3440 includes integrated protection features such as ±15 kV ESD on I/O pins, which exceeds the typical ±8 kV offered by some competitive parts. At 250 kbps, it supports longer cable runs than devices limited to 100 kbps, though it consumes slightly more quiescent current than ultra-low-power variants designed for battery applications.
What layout considerations are critical when implementing the MAX3440EESA+T in a high-noise industrial control system?
Due to its half-duplex operation and reliance on differential signaling, proper PCB grounding and trace routing are essential. The MAX3440EESA+T should be placed close to the microcontroller or PLC interface to minimize stub lengths on A/B lines. Use controlled-impedance traces with 120Ω differential impedance, and ensure a solid ground plane beneath the 8-SOIC package. Decoupling capacitors (e.g., 0.1µF ceramic) must be placed within 5 mm of the VCC pin, as the 5.25V maximum supply requires stable regulation to maintain specified output levels under transient loads.
Can the MAX3440EESA+T operate reliably in automotive-grade environments, and what design precautions are necessary?
The MAX3440EESA+T is rated for -40°C to +85°C, which meets most commercial and industrial standards but falls short of AEC-Q100 Grade 2 (–40°C to +105°C). For automotive applications requiring higher reliability, additional environmental testing or component derating may be needed. However, its robust ESD protection (±15 kV HBM) and high common-mode range (–7 V to +12 V) make it suitable for non-critical automotive subsystems such as sensor networks or diagnostic interfaces where cost and space are constrained.
What termination strategies should be used when deploying the MAX3440EESA+T over long RS-485 bus lengths?
For bus lengths exceeding 50 meters at 250 kbps, a 120Ω resistor across the A and B lines near the final node is recommended to prevent reflections. The MAX3440EESA+T’s 250 kbps data rate allows shorter rise/fall times, increasing susceptibility to ringing; thus, series termination resistors (22Ω–100Ω) at the driver outputs can improve signal integrity. Avoid stub connections longer than 5 cm to reduce capacitive loading, which could degrade edge rates and exceed the slew rate limits implied by the 250 kbps maximum.
How does the MAX3440EESA+T handle bus contention scenarios, and what external circuitry is advised?
As a half-duplex transceiver, the MAX3440EESA+T disables its transmitter during receive mode to prevent bus contention, but this relies on correct enable timing from the host controller. Without external control logic, simultaneous transmission attempts could still cause internal stress. To mitigate risk, use an open-drain or tri-state driver interface with proper direction control signals. Additionally, TVS diodes rated for ±15 V clamping voltage should be placed at each node to protect against inductive kickback from motor loads or relay coils connected nearby.
Is the MAX3440EESA+T suitable for use in intrinsically safe or explosion-proof environments?
While the MAX3440EESA+T itself is not certified for hazardous locations (e.g., ATEX or IECEx), its low power dissipation (~5 mA typical) and absence of spark-generating components make it potentially compatible with zone-rated systems if installed within approved enclosures. However, full compliance would require integration into a certified subsystem and adherence to local electrical codes. Its RoHS3 compliance also ensures halogen-free construction, which aligns with safety standards for fire hazard reduction.
What impact does supply voltage variation have on the MAX3440EESA+T’s output levels, and how should this inform system design?
Operating within the 4.75V to 5.25V range ensures consistent driver output voltages (typically ±1.5 V minimum), maintaining compatibility with TTL-level logic receivers even at the lower end of the supply window. A 10% drop from 5.25V to 4.75V reduces headroom by only about 0.5 V, preserving noise margins. Designers should avoid using switching regulators without adequate filtering, as ripple above 50 mV peak-to-peak can induce jitter at 250 kbps. Linear regulators with <1% line regulation are preferred for noise-sensitive applications.
How does the MAX3440EESA+T perform in multi-drop configurations with multiple nodes sharing the same bus?
In a 32-node RS-485 network, the MAX3440EESA+T can drive the bus effectively due to its ±200 mA short-circuit protected drivers. However, each node adds capacitance, so total bus capacitance should remain below 50 pF per meter of cable. At 250 kbps, propagation delay becomes significant over 100 meters, so address-based polling rather than broadcast messaging is advisable. Termination remains critical: either one 120Ω resistor at each end or a center-tapped scheme depending on stub length distribution.
What are the implications of the MAX3440EESA+T’s Moisture Sensitivity Level (MSL) rating of 1 for manufacturing and storage?
With MSL 1, the MAX3440EESA+T can be stored indefinitely at ambient conditions without baking prior to reflow soldering. This simplifies inventory management and reduces processing steps compared to MSL 2 or higher parts. Manufacturers benefit from reduced lead time and lower handling costs, especially in high-volume production. No special packaging beyond standard anti-static measures is required, aligning with standard SMT assembly workflows.
How does the MAX3440EESA+T compare in size and thermal performance to larger SOIC packages like TSSOP or QFN?
The 8-SOIC (3.90 mm width) form factor of the MAX3440EESA+T offers a smaller footprint than TSSOP counterparts while providing adequate thermal conductivity for typical power dissipation (<100 mW). It lacks exposed pads like those found in QFN packages, so heat dissipation relies solely on conduction through leads and copper pours—adequate for continuous operation under normal conditions. In compact designs, placement near board edges or with thermal vias improves convective cooling but is rarely necessary given the modest current draw.
Are there any known limitations of the MAX3440EESA+T regarding clock recovery or synchronization in master-slave architectures?
The MAX3440EESA+T does not include built-in clock recovery circuitry, so timing synchronization must be managed externally via UART baud rate matching or hardware handshaking. At 250 kbps, tolerance to timing skew is limited to approximately ±5% between transmitter and receiver clocks; therefore, crystal oscillators with <10 ppm stability are recommended for both ends of the link. Without such precision, accumulated bit errors may occur over extended message sequences, particularly in asynchronous communication modes.
What precautions should be taken when replacing the MAX3440EESA+T with another part in an existing design?
Any replacement must match the 4.75V–5.25V supply range, 250 kbps capability, and half-duplex topology. Devices like the MAX485 lack sufficient hysteresis and ESD protection, risking misoperation in noisy settings. Similarly, faster transceivers (e.g., 10 Mbps types) introduce excessive EMI and may require redesign of termination and shielding. Always verify driver slew rate compatibility with cable type—faster edges demand lower capacitance and careful layout to avoid radiated emissions above FCC Class B limits.
How does temperature drift affect the MAX3440EESA+T’s input thresholds, and what compensation techniques exist?
Over the –40°C to +85°C range, the receiver threshold typically varies by less than ±10%, preserving logic level margins. However, extreme temperatures can shift the 25 mV hysteresis slightly, potentially affecting edge detection consistency. To compensate, designers may implement software-based baud rate calibration or use external Schmitt triggers with tighter tolerances. Alternatively, selecting cables with low thermal coefficient of attenuation minimizes signal degradation independent of the IC’s behavior.
What role does the base product number MAX3440 play in variant selection and future procurement?
The base product number MAX3440 encompasses all derivatives including the EESA+T (8-SOIC, –40°C to +85°C), ECSA+T (8-DIP), and others. Understanding this relationship helps engineers evaluate alternate packages or temperature grades during redesigns without revalidating core functionality. Procurement teams benefit from broader distributor stock coverage and simplified obsolescence planning, as changes to the base design propagate predictably across submodels while maintaining interface compatibility.
Can the MAX3440EESA+T support hot-plugging on an active RS-485 bus?
Hot insertion is possible due to the device’s robust I/O protection (±15 kV ESD, –7 V to +12 V common-mode range), but without additional circuitry like zero-crossing switches or precharge resistors, inrush currents during connection can momentarily overload drivers or disturb ongoing transmissions. For reliable hot-plug capability, consider adding MOSFET-based isolation circuits or opto-isolated interfaces that disconnect the bus until steady state is reached—critical in modular systems where nodes are frequently added or removed.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX3440EESA+T

Product Attribute MAX3440EASA+T MAX3440EESA MAX3440EEPA+ MAX3440EASA+
Part Number MAX3440EASA+T MAX3440EESA MAX3440EEPA+ MAX3440EASA+
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)
Receiver Hysteresis - - - -
Protocol - - - -
Data Rate - - - -
Type - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Number of Drivers/Receivers - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Base Product Number - DAC34H84 MAX500 ADS62P42
Duplex - - - -
Series - - - -
Voltage - Supply - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

MAX3440EESA+T Datasheet PDF

Download MAX3440EESA+T pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX3440EESA+T - Analog Devices Inc./Maxim Integrated.

Datasheets
MAX3440E-44E.pdf
Application Notes
Introduction to Programmable Logic Controllers (PL.pdf Overview of Industrial Motor Control Systems.pdf RS-485 (EIA/TIA-485) Differential Data Transmissio.pdf
Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf Red Phosphorous Certificate.pdf
Part Numbering Guide
Part Numbering System.pdf
Other Related Documents
Still the Most Robust Communication Tutorial.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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MAX3440EESA+T Image

MAX3440EESA+T

Analog Devices Inc./Maxim Integrated
32D-MAX3440EESA+T

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