MAX3490EESA+ - 12Mbps RS-485/RS-422 Transceiver | Analog Devices
料号： MAX3490EESA+ ✓ 量产中MAX3490EESA+ 概述
An RS-485/RS-422 transceiver is an interface IC that converts logic-level signals into balanced differential bus signals and converts received differential signals back into logic levels. It belongs to the communication-interface hierarchy: transceiver → RS-485/RS-422 interface IC → interface IC → integrated circuit. These transceivers are designed for longer-distance, noise-resistant data links than single-ended interfaces, making them suitable for industrial equipment, building controls, instrumentation, and long cable runs.
The MAX3490EESA+ combines 12 Mbps operation with 3.3 V power operation. Its one-driver, one-receiver arrangement allows a node to transmit and receive data, although the driver and receiver enable functions determine the operating direction. The manufacturer describes the MAX3490E family as slew-rate-limited, true RS-485/RS-422 devices with ±15 kV ESD protection. The 8-pin SOIC package supports compact surface-mount layouts while exposing the standard transceiver functions needed for balanced bus implementations.
At the system level, the MAX3490EESA+ bridges a host controller or programmable logic and a differential communication bus. The receiver evaluates the difference between the two bus conductors, providing common-mode rejection for a noise-affected industrial environment. The differential bus also enables ground-potential differences between connected equipment to be tolerated within the interface's specified operating limits. The exact common-mode range, receiver thresholds, and electrical limits must be confirmed in the manufacturer datasheet before final sign-off.
Typical uses include industrial control links, factory automation equipment, building-automation nodes, test and measurement systems, and embedded data acquisition. The 12 Mbps capability is useful when a design must transfer short, high-volume data bursts over a modest cable distance rather than operate as a slow long-distance field bus. The part can also pair with isolation or interface components when a design requires galvanic separation, surge protection, or additional bus transceivers.
Designers should verify the differential-impedance-controlled trace and cable geometry, provide the bus termination specified by the system architecture, and connect the transceiver reference or common-mode network according to the manufacturer application guidance. Placement near the connector can reduce exposure of sensitive receive paths to radiated and conducted noise. Decoupling should also follow the datasheet recommendations, while ESD protection should be evaluated at the connector rather than assumed to replace an external protection network.
This product page consolidates the verified manufacturer, distributor, and cross-reference information with practical selection guidance, packaging details, interface comparisons, and application notes. It is intended to help engineers identify the correct 8-SOIC transceiver while separating documented parameters from values that still require datasheet confirmation.
直接替换替代料： MAX3490EESA+ ——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： MAX3490EESA+ （相同外形与封装尺寸） ——差异在于 Driver Type, Package, Product Type, Supply Voltage, AEC-Q100 Qualification.
MAX3490ECSA+
✅ 直接替换📋 参考替代料（不在目录中）
MAX3490CSA+
✅ 直接替换联系询价
查看数据手册 →MAX3491EESD+
✅ 直接替换📋 参考替代料（不在目录中）
MAX3490ESA+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →MAX3491ESA+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX3490EESA+ 规格参数
| Product Type | RS-485/RS-422 transceiver |
| 电源电压 | 3.3 V |
| Maximum Data Rate | 12 Mbps |
| ESD Protection | ±15 kV |
| Driver Count | 1 driver |
| Receiver Count | 1 receiver |
| Communication Standards | RS-485 and RS-422 |
| Driver Type | Slew-rate limited |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Production Status | Production |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
MAX3490EESA+ 8-pin soic 引脚配置指南
MAX3490EESA+（8-pin soic 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MAX3490EESA+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3490EESA+ 适用于 6 应用s: Industrial Control and Automation Links, Building Automation and Environmental Control, Test and Measurement Data Acquisition, Embedded Instrument and Sensor Networks, Networking and Communication Gateways, Robust External Communication Port.
Industrial Control and Automation Links
The MAX3490EESA+ fits industrial control links that require a compact 3.3 V differential-bus interface and up to 12 Mbps operation. Its one-driver, one-receiver configuration supports bidirectional communication nodes, while the slew-rate-limited driver helps reduce cable reflections and electromagnetic interference. The documented ±15 kV ESD protection is valuable when the transceiver is positioned near control equipment or external wiring. A designer can place it between a controller UART and a factory-floor RS-485 network, using the manufacturer's enable and termination guidance. The 8-SOIC package simplifies surface-mount assembly, although common-mode range, temperature limits, and isolation requirements must be confirmed in the official data sheet before deployment.
推荐
Building Automation and Environmental Control
The MAX3490EESA+ can connect environmental controllers, room modules, and supervisory equipment over a 3.3 V RS-485 network. Its 12 Mbps maximum rate supports short, burst-oriented communications between nodes, while the differential signaling helps maintain data integrity across building wiring where ground offsets and coupled noise are possible. The slew-rate-limited driver is useful for reducing unwanted high-frequency energy on the cable. Designers should place the transceiver close to the connector, use a controlled differential bus layout, and verify the supported common-mode range. Where safety isolation is required, an isolation barrier and isolated supply should be added rather than assuming the transceiver itself provides galvanic protection.
推荐
Test and Measurement Data Acquisition
The MAX3490EESA+ is appropriate for laboratory and field-test equipment that must exchange measurement commands or data over a robust differential interface. A 12 Mbps bus can reduce transfer time for high-volume samples, while the low-power 3.3 V supply simplifies integration with modern test processors. The transmitter and receiver support a bidirectional node, allowing a central instrument to configure remote fixtures and collect results over a shared bus. Engineers should use controlled impedance, proper common-mode grounding, and termination appropriate to the cable topology. The ±15 kV ESD rating adds connector-adjacent robustness, but it does not replace surge protection or isolation for externally accessible cables.
推荐
Embedded Instrument and Sensor Networks
The MAX3490EESA+ can bridge a low-power embedded controller and an RS-485 or RS-422 instrument network. Its 3.3 V operation is compatible with systems that already use that supply, and its 8-SOIC footprint allows a compact bus interface beside the controller. The 12 Mbps capability is useful for sensor nodes that transmit bursts, whereas slower long-distance networks may be operated below the maximum rate. The differential bus provides noise immunity, and the documented ±15 kV ESD protection helps with user-accessible cabling. Designers should confirm operating-temperature limits, common-mode voltage, enable timing, and bus loading against the official data sheet because those details were not included in the verified excerpts.
推荐
Networking and Communication Gateways
The MAX3490EESA+ can serve as the industrial serial interface on a communication gateway that converts a local controller bus to RS-485 or RS-422. One driver and one receiver provide a basic bidirectional node, while the 3.3 V supply supports integration with compact embedded systems. The 12 Mbps maximum rate is valuable for local serial aggregation, although the actual usable distance depends on cable length, topology, and signal integrity. The slew-rate-limited output and documented ±15 kV ESD protection help manage a harsh interface environment. A gateway designer should provide local decoupling, preserve controlled-impedance routing, use the recommended bus topology, and verify that the operating and common-mode ranges satisfy the target installation.
推荐
Robust External Communication Port
The MAX3490EESA+ is suitable for a compact external communication port where a host must connect to a remote board over a differential cable. Its ±15 kV ESD protection is the key documented ruggedness feature for connector-adjacent placement, while slew-rate-limited operation helps limit high-frequency interference. The transceiver can support a bidirectional point-to-point link or participate in a properly designed RS-485 network. Placement near the connector shortens unprotected receive traces, but designers still need to evaluate external surge paths, chassis grounding, and isolation. The verified source set does not establish the complete external-line ratings, so the official data sheet and system-level protection design must control final approval.
推荐
推荐产品汇总
工程参考数据： MAX3490EESA+ ——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 | MAX3490ECSA+ | MAX3490CSA+ | MAX3491EESD+ | MAX3490ESA+ | MAX3491ESA+ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Interface Standards | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 |
关键差异点
- Documented high-rate operation （对比 MAX3490ESA+)
- ESD protection is explicitly documented （对比 MAX3490CSA+)
- Compact production 8-SOIC interface （对比 MAX3491EESD+)
设计说明
Place the MAX3490EESA+ close to the external connector and route the differential bus as a controlled-impedance pair with minimal stubs. Keep the receive-side network away from switching nodes and keep the ground reference continuous. The verified 12 Mbps rating applies to a suitable implementation, so board stack-up, connector geometry, cable type, and return path should be reviewed together rather than treating 12 Mbps as a board-independent guarantee.
The slew-rate-limited driver helps reduce electromagnetic interference and reflections, but the bus still requires deliberate termination and topology control. Use termination only where required by the selected RS-485 or RS-422 network, and avoid long stubs from the main cable. For especially long or noisy installations, verify whether an isolated interface such as ISO1432DWR is required; the MAX3490EESA+ itself provides ESD protection but does not establish galvanic isolation.
Do not assume that every MAX3490-family suffix is electrically identical. The supplied comparison identifies MAX3490ECSA+ and MAX3490CSA+ as package-compatible candidates, but ESD rating, enable timing, propagation delay, temperature range, and loading can still affect suitability. Before substituting, compare the exact manufacturer data-sheet revision and verify pin names, shutdown behavior, common-mode range, and bus-drive capability.
Use the manufacturer-recommended local bypass capacitor and supply layout at the transceiver, and avoid routing the 3.3 V rail through long or narrow paths shared with switching loads. Because the supplied source excerpts do not state supply current or decoupling values, those values must be obtained from the MAX3490E data sheet rather than copied from an unrelated transceiver. This is especially important when several nodes share a low-current branch of an industrial board.
合规信息
The supplied excerpts reference RoHS and REACH only as comparison fields and do not provide definitive status values for MAX3490EESA+. Compliance must be confirmed using the current manufacturer product documentation or declaration.