MAX485ESA+T - 2.5Mbps RS-485/RS-422 Transceiver | ADI
料号： MAX485ESA+T ✓ 量产中MAX485ESA+T 概述
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver. These transceivers connect a host controller, PLC, sensor, or industrial endpoint to a balanced communication bus. The RS-485 standard hierarchy supports longer, noise-resistant interconnects than single-ended interfaces, while RS-422 compatibility allows the same device family to serve point-to-point links. Driver enable and receiver-enable inputs provide local control over bus direction and reception.
The MAX485ESA+T uses a 4.75V to 5.25V supply and supports data rates up to 2.5Mbps. Its driver is short-circuit-current limited and protected, an important feature when a bus fault drives a line into a low-impedance condition. The integrated receiver converts differential bus voltage into a logic-level output, while the driver converts logic-level data into differential output. This combination supports half-duplex operation, in which the same pair of conductors carries transmitted and received data at different times.
The 8-pin SOIC package keeps the implementation compact and familiar to industrial-control board designers. Because the MAX485ESA+T does not limit its slew rate, it can transmit at up to 2.5Mbps according to the provided manufacturer and distributor documentation. That speed is useful for factory automation, instrumentation, and embedded control networks, although cable length, termination, topology, and signal integrity become increasingly restrictive as data rate rises.
Typical uses include RS-485 fieldbus connections, motor-control diagnostics, industrial sensor gateways, building-control equipment, and communications between a microcontroller and remote peripheral. In a typical circuit, the transceiver sits between a UART-capable controller and a protected, twisted-pair bus. A termination resistor is placed at each end of the bus, while common-mode protection and chassis-grounding practices may be needed in electrically noisy installations.
Designers should verify that the selected cable length and topology can support the intended 2.5Mbps rate, connect the receiver and driver enables for the required half-duplex behavior, and maintain compatible logic levels across the system. The 5V supply requirement also requires a 4.75V to 5.25V regulator rather than a 3.3V rail.
This page combines the verified manufacturer and distributor information with package-level engineering guidance, practical interface considerations, pricing context, and pin-compatible replacement analysis to support faster component selection and PCB migration.
直接替换替代料： MAX485ESA+T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX485ESA+T （相同外形与封装尺寸） ——差异在于 Data Rate, Package, RoHS Status, Mounting Type, Duplex.
MAX481ESA
✅ 直接替换📋 参考替代料（不在目录中）
MAX483ESA
✅ 直接替换📋 参考替代料（不在目录中）
MAX487ESA+
✅ 直接替换联系询价
查看数据手册 →MAX1487ESA
✅ 直接替换📋 参考替代料（不在目录中）
SP485EN-L/TR
✅ 直接替换📋 参考替代料（不在目录中）
COS485ESA
✅ 直接替换📋 参考替代料（不在目录中）
MAX485ESA+T 规格参数
| Product Type | RS-485/RS-422 transceiver |
| Transceiver Configuration | 1 driver and 1 receiver |
| Operating Mode | Half-duplex |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 2.5 Mbps |
| Slew Rate Limiting | Not limited |
| Driver Short-Circuit Protection | Current limited and protected |
| Supported Standards | RS-485 and RS-422 |
| 封装 | 8-pin SOIC |
| Package Pin Count | 8 pins |
| 安装类型 | Surface mount |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
MAX485ESA+T 引脚配置
| 引脚 1 | RO — Receiver output |
| 引脚 2 | RE — Receiver enable, active low |
| 引脚 3 | DE — Driver enable, active high |
| 引脚 4 | DI — Driver input |
| 引脚 5 | GND — Ground |
| 引脚 6 | Y — Non-inverting driver output |
| 引脚 7 | A — Inverting driver output |
| 引脚 8 | VCC — Positive supply |
典型应用
MAX485ESA+T 适用于 6 应用s: Industrial PLC Fieldbus Communication, Factory Sensor Gateway, Motor Control and Diagnostics, Building Control and HVAC Equipment, Instrumentation and Measurement Systems, Remote Monitoring and Environmental Telemetry.
Industrial PLC Fieldbus Communication
The MAX485ESA+T fits PLC fieldbus modules that require a 5V half-duplex differential interface at rates up to 2.5Mbps. Its integrated driver and receiver connect the controller's UART logic to a balanced industrial bus, while the protected driver helps limit fault current when a line is shorted. The 8-pin SOIC supports compact, surface-mount assembly. In a multi-drop installation, terminate both physical ends of the bus, maintain consistent reference ground, and verify that the selected cable length preserves reliable margins at the intended data rate.
推荐
Factory Sensor Gateway
The MAX485ESA+T is suitable for a factory sensor gateway that aggregates remote RS-485 measurements over a wired industrial backbone. Its 4.75V to 5.25V operating range matches conventional industrial logic systems, while the 2.5Mbps capability supports rapid polling of multiple field devices. The transceiver is placed between the gateway UART and a protected twisted-pair bus. Designers should account for bus-stub length, common-mode transients, and the timing relationship between driver enable and receiver enable during direction changes.
推荐
Motor Control and Diagnostics
The MAX485ESA+T can serve as the communication link in a motor-control module where a controller monitors drive diagnostics or exchanges commands with a remote drive. Differential RS-485 reception improves tolerance to industrial noise compared with a single-ended link, and the 2.5Mbps rate provides ample bandwidth for control and status packets. The protected driver helps contain bus faults, but the implementation still needs appropriate surge protection, grounding, and isolation strategy when the motor environment introduces high-energy transients.
推荐
Building Control and HVAC Equipment
The MAX485ESA+T is appropriate for building-control equipment that uses an RS-485 backbone for sensors, actuators, or distributed HVAC controllers. Its one-driver, one-receiver arrangement enables half-duplex communication from a common bus, and the 8-pin SOIC package fits standard controller-board layouts. For reliable building deployments, use twisted-pair cabling, place termination only at the two bus endpoints, route communications wiring away from high-current switching circuits, and validate operation across the required temperature and ground-offset conditions.
推荐
Instrumentation and Measurement Systems
The MAX485ESA+T fits laboratory and industrial instrumentation that distributes commands or collects measurements across a multi-drop RS-485 bus. Its 2.5Mbps capability shortens transaction time and supports bursts of measurement data, while the differential receiver helps preserve signal integrity in instrument racks containing switching power supplies and motors. The transceiver requires a compatible 5V supply and logic family; designers should keep analog and digital return currents separated and use calibrated termination to minimize reflections on the bus.
推荐
Remote Monitoring and Environmental Telemetry
The MAX485ESA+T can connect environmental monitors, remote sensors, and telemetry equipment over a wired RS-485 network. The 4.75V to 5.25V supply and 2.5Mbps data capability support both slow monitoring traffic and higher-rate burst updates. The transceiver is typically connected to a microcontroller UART, with the driver and receiver enables coordinated to avoid bus contention. Long outdoor cables require deliberate protection, grounding, and surge-current handling because the verified source data does not establish the device's transient withstand ratings.
推荐
推荐产品汇总
工程参考数据： MAX485ESA+T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX481ESA | MAX483ESA | MAX487ESA | MAX1487ESA | SP485EN-L/TR | COS485ESA |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | MaxLinear | Cosine Nanoelectronics |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Product Type | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485 transceiver | RS-485/RS-422 transceiver |
关键差异点
- High-speed half-duplex operation （对比 MAX481ESA)
- No slew-rate limitation （对比 SP485EN-L/TR)
- Protected differential driver （对比 COS485ESA)
设计说明
Route the MAX485ESA+T driver and receiver connections as a closely matched differential pair. Place the bus-side protection and termination components near the transceiver or connector according to the cable interface design, and provide a short, low-impedance ground return. Keep switching-power-supply loops and high-current motor traces away from the RS-485 pair to reduce differential noise coupling and common-mode conversion.
Design the transceiver rail for 4.75V to 5.25V. Decouple the VCC pin with local high-frequency and bulk capacitance close to the device, while keeping the return current continuous. The verified source data does not state the device's supply-current limit, so calculate the regulator capacity from the manufacturer electrical characteristics before adding cable-driver load or adjacent 5V circuitry.
Do not enable the driver and receiver outputs simultaneously if multiple nodes can transmit on the same bus. Coordinate DE and /RE around the UART direction-control signal, allow the required driver and receiver settling time, and confirm that no other node begins transmitting before the previous transmission has ended. Incorrect enable polarity or timing is a common source of corrupted frames and bus contention.
Use twisted-pair cable for the differential bus and terminate only the two physical ends of the main trunk. Avoid long stub branches, particularly at the 2.5Mbps maximum rate, because reflected signals can overlap the next bit. Verify the completed cable length, topology, common-mode range, and protection scheme using the manufacturer's recommended operating conditions and appropriate test equipment.
合规信息
The supplied manufacturer and distributor search results do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements for MAX485ESA+T. No compliance status was assumed.