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Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
ADI/LINEAR MAX491ESD+T MAX491ESD
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ADI(Analog Devices) / LINEAR MAX491ESD+T
- Type
- ADI/LINEAR
- Minimum package
- 2500
Technical parameters
- Electronic Component
- ADI(Analog Devices) / LINEAR
- Electronic Component
- MAX491ESD+T
- Electronic Component
- 1
- Package
- SOIC-14
- Type
- Transceiver
- Electronic Component
- RS-485 / RS-422IC
- Electronic Component
- 0.292g
- Electronic Component
- 32
- Electronic Component
- 1
- Features
- Tx / Rx
- Electronic Component
- BM0258831997
- Operating Temperature
- 40℃~+85℃
- Operating Voltage
- 4.75V~5.25V
- Receiver
- 1
- Data
- 2.5Mbps
- Communication
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
MAX491ESD+T 产品概述
一、器件概述
MAX491ESD+T 为 ADI/LINEAR 系列的低功耗 RS-422/RS-485 收发器，采用 SOIC-14 封装。器件集成 1 路驱动器与 1 路接收器，支持全双工通信，工作电压范围为 4.75V ～ 5.25V，面向工业级应用设计，工作温度范围 -40℃ ～ +85℃，适合多节电源与严苛环境下长期可靠运行。
二、关键电气性能
- 数据速率高达 2.5Mbps，满足大多数工业现场总线与高速数据链路需求。
- 支持多点网络，最多可连接 32 个节点，适合多站点分布式系统。
- 静态电流仅约 300µA，实现低功耗待机，有利于节能系统与断电敏感场景。
- 器件采用斜率限制（slew-rate-limited）设计，有效降低驱动边沿的谐波分量，减少 EMI 干扰与反射。
三、特性与优势
- 低功耗：待机电流小，适合持续通电且对能耗敏感的工业自动化与远程终端设备。
- 抗干扰、可控辐射：斜率限制减少高速沿冲，便于满足电磁兼容（EMC）要求并简化系统滤波设计。
- 全双工通信：支持驱动器与接收器同时工作，提高链路效率与通信吞吐。
- SOIC-14 封装便于标准 PCB 工艺组装与散热管理，适合集成到现有设计平台。
四、典型应用场景
- 工业控制与现场总线（PLC、I/O 模块、传感器网络）
- 楼宇自动化、安防与门禁系统的远距离差分通信
- 串行数据聚合器、工业网关、数据采集终端（DAQ）
- 需要低 EMI 与低静态功耗的远端节点与供电受限设备
五、设计与使用建议
- 差分总线末端建议使用 120Ω 终端电阻以减小反射，并保证信号完整性。
- PCB 布线时注意差分对长度匹配与连续阻抗控制，远离高频噪声源以降低共模干扰。
- 若系统需更高 ESD 保护，可结合外部防护元件或选择带更高内置 ESD 等级的封装版本。
- 在多节点网络中，合理规划驱动器使能与上拉/下拉策略，保证总线空闲态可预测。
六、总结
MAX491ESD+T 是一款面向工业与通信终端的高性价比 RS-422/RS-485 收发器，结合低静态电流、斜率限制技术与全双工支持，能够在保证信号完整性与 EMI 控制的前提下，为多节点差分总线提供可靠的物理层解决方案。
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