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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversMAX485CUA
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MAX485CUA - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX485CUA
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX485CUA
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
19,501 pcs available, New & Original
Parts Description
RS-485/RS-422 TRANSCVR
Package
8-µMAX
Data sheet
-
RoHs Status
 
Compare
Our certification
In stock: 19501
  • Unit Price: $3.536
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $3.536 $3.54
10+ $3.081 $30.81
30+ $2.81 $84.30
100+ $2.535 $253.50
500+ $2.409 $1,204.50
1000+ $2.352 $2,352.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

MAX485CUA Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX485CUA technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX485CUA

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 8-µMAX
Series -
Receiver Hysteresis 70 mV
Protocol RS422, RS485
Product Attribute Attribute Value
Package / Case 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Package Bulk
Operating Temperature 0°C ~ 70°C (TA)
Number of Drivers/Receivers 1/1
Mounting Type Surface Mount
Duplex Half
Data Rate 2.5Mbps

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Affected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

MAX485CUA Image
MAX485CUA (1)

Manufacturer Part Number

MAX485CUA

Manufacturer

Analog Devices

Introduction

The MAX485CUA is a transceiver module designed for RS422 and RS485 communication protocols, featuring a half-duplex capability.

Product Features and Performance

Supports RS422 and RS485 protocols

Half-duplex communication

Data rate of up to 2.5Mbps

Receiver Hysteresis of 70 mV

Operates within a supply voltage range of 4.75V to 5.25V

Product Advantages

High-speed communication capability

Efficient operation with low voltage supply requirements

Compact 8-TSSOP, 8-MSOP packaging suitable for space-sensitive applications

Key Technical Parameters

Data Rate: 2.5Mbps

Receiver Hysteresis: 70 mV

Voltage Supply: 4.75V ~ 5.25V

Operating Temperature Range: 0°C ~ 70°C

Mounting Type: Surface Mount

Quality and Safety Features

Robust surface mount package for reliable soldering and durability

Built to operate efficiently within the specified temperature range

Compatibility

Compatible with RS422 and RS485 communication standards

Suitable for integration in systems requiring half-duplex communication

Application Areas

Industrial automation

Data communication systems

Networking systems in commercial and industrial environments

Product Lifecycle

Status: Obsolete

Options for replacement or upgrades might be limited due to discontinuation

Several Key Reasons to Choose This Product

Ability to communicate effectively across RS422 and RS485 protocols

High-speed data transmission capability up to 2.5Mbps

Operates on a low voltage supply, reducing power consumption

Compact form factor ideal for applications with limited space

Comprehensive operational range in temperatures from 0°C to 70°C ensures reliability in various environments

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the MAX485CUA transceiver that influence noise immunity in industrial RS-485 networks?
The MAX485CUA features a receiver hysteresis of 70 mV, which helps reject common-mode noise and improves signal integrity in electrically noisy environments typical of industrial settings. This threshold ensures reliable data interpretation even when signal levels fluctuate due to electromagnetic interference. Operating within a narrow supply range of 4.75V to 5.25V also contributes to stable performance across temperature variations from 0°C to 70°C.
How does the MAX485CUA compare to other half-duplex transceivers like the MAX485EUA+ in terms of data rate and voltage tolerance under marginal supply conditions?
While both devices support similar data rates up to 2.5 Mbps, the MAX485CUA operates at slightly lower supply voltages (4.75–5.25V) compared to some variants, making it less tolerant to voltage droop or ripple. In contrast, the MAX485EUA+ maintains compatibility over a wider range but may exhibit reduced margin in low-noise environments due to tighter input thresholds. For designs with unstable power delivery, the EUA+ variant offers greater robustness, whereas the CUA is optimized for cost-sensitive applications where clean power is assured.
Can the MAX485CUA be used in multi-drop RS-485 configurations requiring termination resistors, and what design considerations apply?
Yes, the MAX485CUA supports standard RS-485 multi-drop topologies, including those with termination resistors at each end of the bus. However, because it uses a half-duplex configuration (one driver, one receiver), proper timing between transmit and receive modes must be managed by the host controller to avoid contention. Additionally, the 8-µMAX package’s compact footprint simplifies PCB layout but requires attention to trace length and impedance matching to maintain signal integrity at data rates near 2.5 Mbps.
What impact does the limited operating temperature range of the MAX485CUA have on outdoor or harsh environment deployments?
With an operating range of 0°C to 70°C, the MAX485CUA is unsuitable for direct exposure to extreme ambient temperatures without thermal management. In outdoor or industrial environments where ambient temperatures may exceed 70°C, additional cooling or enclosure ventilation would be required. This constraint makes the device better suited for indoor or climate-controlled systems where thermal stability can be guaranteed.
How should designers account for the RoHS non-compliance status of the MAX485CUA in regulatory-sensitive markets such as Europe?
The MAX485CUA's RoHS non-compliant status indicates the presence of restricted substances like lead in its construction. Projects targeting CE marking or other EU regulations must either substitute with a RoHS-compliant variant—such as the MAX485EUA+—or obtain exemptions if applicable. Failure to address this can result in product rejection during certification, particularly for consumer or medical equipment.
What is the significance of the Moisture Sensitivity Level 1 classification for the MAX485CUA in manufacturing and storage workflows?
MSL 1 means the MAX485CUA is not sensitive to moisture and can be stored indefinitely without baking prior to reflow soldering. This simplifies inventory handling and reduces processing steps in high-volume assembly lines, lowering production costs and minimizing risk of moisture-related defects like popcorning during thermal cycling.
In a system requiring galvanic isolation, how does the MAX485CUA perform relative to isolated transceiver solutions, and what alternatives should be considered?
The MAX485CUA provides no built-in electrical isolation between transmitter and receiver circuits, making it vulnerable to ground loops and surge events in unshielded environments. For such applications, alternatives like the MAX14850 or MAX14910—which integrate optocouplers or magnetic isolators—are preferred despite higher pin counts and cost. Isolation adds bulk and complexity but is essential for safety-critical or long-distance installations.
How does the MAX485CUA handle bus contention when multiple nodes attempt to drive simultaneously, and what protection mechanisms are in place?
As a standard RS-485 half-duplex transceiver, the MAX485CUA lacks internal arbitration logic; thus, simultaneous transmission attempts cause bus contention and potential damage. Protection relies on external control: the DE (Driver Enable) and RE (Receiver Enable) pins must be carefully sequenced so only one node drives the line at a time. Adding bus contention detection circuitry or using open-collector drivers with wired-AND logic can further enhance reliability in shared-medium networks.
What trade-offs exist between using the MAX485CUA versus full-duplex RS-422 transceivers in bidirectional communication scenarios?
The MAX485CUA’s half-duplex nature limits communication to alternating transmit/receive cycles, increasing latency in two-way exchanges. Full-duplex RS-422 transceivers allow simultaneous transmission and reception, doubling throughput efficiency but requiring separate TX and RX lines and more pins. For applications like daisy-chained sensors or simple polling systems, the MAX485CUA suffices; for real-time bidirectional control, full-duplex architectures offer superior responsiveness despite added complexity.
How does the 2.5 Mbps data rate of the MAX485CUA translate to maximum cable length in practical installations, and what factors reduce this distance?
At 2.5 Mbps, the MAX485CUA supports typical RS-485 cable lengths up to approximately 400 meters using shielded twisted-pair cabling. However, actual reach depends heavily on cable quality, connector losses, number of nodes, and environmental noise. Each additional load increases capacitance, reducing rise times and degrading signal fidelity. In practice, distances above 200 meters may require repeaters or lower baud rates to ensure error-free operation.
What role does the 8-µMAX package play in space-constrained embedded designs using the MAX485CUA?
The 8-pin µMAX package measures just 3 mm wide and occupies minimal board area, enabling dense layouts in compact controllers. Its surface-mount form factor aligns well with automated assembly processes. However, routing fine-pitch traces demands careful attention to pad spacing and thermal relief to prevent soldering defects, especially in hand-assembled prototypes.
How does the MAX485CUA’s receiver hysteresis compare to that of competing parts like the SN65HVD72, and what implications does this have for noisy environments?
The MAX485CUA provides 70 mV of hysteresis, which is moderate compared to the SN65HVD72’s higher 120 mV threshold. Greater hysteresis improves noise rejection by preventing chatter near threshold crossings, benefiting systems with significant EMI. While the SN65HVD72 excels in rugged field deployments, the MAX485CUA trades off some immunity for lower power and simpler interface requirements, making it appropriate where noise margins are sufficient and cost is a priority.
Are there any known limitations in using the MAX485CUA with microcontrollers lacking dedicated UART hardware flow control?
Yes, without hardware handshaking, software-based UART implementations must manage DE/RE pin timing precisely to avoid partial transmissions or reception gaps. The MAX485CUA responds quickly to enable signals, but software delays can cause glitches if not synchronized properly. Using interrupt-driven state machines or DMA-assisted toggling helps mitigate these issues, though it increases firmware complexity compared to full-duplex UARTs with native support.
What considerations apply when cascading multiple MAX485CUA devices on the same RS-485 bus beyond basic termination and biasing?
Beyond adding 120 Ω termination resistors at bus ends, each node should include bias resistors (typically 5 kΩ pull-up on A and pull-down on B) to set default idle states and prevent floating inputs. The MAX485CUA’s differential receivers tolerate common-mode voltages from -7V to +12V, allowing flexible grounding, but excessive node count increases total bus capacitance, potentially limiting usable data rates below 2.5 Mbps.
How does the MAX485CUA perform in battery-powered systems where supply voltage drifts below 4.75V during discharge?
Operating below 4.75V violates the absolute maximum ratings and risks undefined behavior or latch-up. In Li-ion or alkaline-powered systems, voltage sag during discharge may push the supply outside safe limits. Designers should ensure the minimum operating voltage is never breached, possibly by switching to a 3.3V-compatible transceiver or implementing brown-out detection with graceful shutdown protocols.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX485CUA

Product Attribute MAX485CUA+ MAX485CUA+T MAX485ECPA MAX485ECSA
Part Number MAX485CUA+ MAX485CUA+T MAX485ECPA MAX485ECSA
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Voltage - Supply - - - -
Data Rate - - - -
Number of Drivers/Receivers - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Duplex - - - -
Receiver Hysteresis - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Protocol - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Type - - - -
Series - - - -

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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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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.
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MAX485CUA Image

MAX485CUA

Analog Devices Inc./Maxim Integrated
32D-MAX485CUA

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

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