SP485EMN-L - 10Mbps Low-Power RS-485 Transceiver | MaxLinear
料号： SP485EMN-L ✓ 量产中SP485EMN-L 概述
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver into a physical-layer component for balanced serial communication. The SP485 belongs to the RS-422/RS-485 interface hierarchy within the broader semiconductor and industrial communications market. Half-duplex operation means the driver and receiver share the same differential pair, allowing the connected device to transmit or receive, but not both simultaneously.
Key features include support for both RS-422 and RS-485 protocols, operation across a 4.75 V to 5.25 V supply range, a maximum data rate of 10,000 kbps, and an industrial temperature range of -40°C to +125°C. The SP485EMN-L family also provides enhanced ESD tolerance of more than ±15 kV for both the human body model and the IEC 61000-4-2 air-discharge method, improving protection during cable connection and industrial installation.
The BiCMOS architecture combines bipolar and CMOS characteristics to provide low-power operation without sacrificing data-rate performance. A single driver and single receiver support point-to-point and multidrop bus arrangements when the system includes the required biasing, termination, protection, and protocol controls. The low-EMI designation is particularly relevant to industrial environments where radiated emissions and cable transients can affect neighboring equipment.
Typical applications include industrial serial buses, building automation controllers, factory data acquisition, remote sensor nodes, industrial gateways, and instrumentation links. The device can also bridge a legacy UART or microcontroller port to a balanced RS-485 network. Its wide temperature range and enhanced ESD performance make it suitable for equipment exposed to temperature variation and electrostatic discharge during field installation or maintenance.
Designers should provide termination at both ends of the bus, bias the differential pair at one location, route the driver and receiver outputs as a balanced pair, and keep unprotected cable connectors away from sensitive logic. Supply and ground decoupling should be placed close to the IC. The half-duplex DE and /RE control functions must be sequenced so that the driver is disabled while the receiver remains active during bus turnaround.
This product data combines verified distributor availability, package and electrical information, candidate drop-in comparisons, and practical implementation guidance. It is intended to help engineers evaluate the SP485EMN-L for industrial RS-485 designs, verify board compatibility, and identify the electrical and layout conditions needed for dependable field operation.
直接替换替代料： SP485EMN-L ——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： SP485EMN-L （相同外形与封装尺寸） ——差异在于 Product Type, Operating Temperature Range, Mounting Type, Package, Maximum Data Rate.
SP485EN-L
✅ 直接替换联系询价
查看数据手册 →SP485ECN-L
✅ 直接替换联系询价
查看数据手册 →SP485EEN-L
✅ 直接替换联系询价
查看数据手册 →LTC1485CS8#PBF
✅ 直接替换📋 参考替代料（不在目录中）
SN75176BDR
✅ 直接替换联系询价
查看数据手册 →SP485EMN-L 规格参数
| Product Type | Half-duplex RS-422/RS-485 transceiver |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 10,000 kbps |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-pin SOIC |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Supported Protocols | RS-422 and RS-485 |
| Duplex Mode | Half-duplex |
| Process Technology | BiCMOS |
| ESD Tolerance, Human Body Model | More than ±15 kV |
| ESD Tolerance, IEC 61000-4-2 Air Discharge | More than ±15 kV |
| 安装类型 | Surface-mount SOIC-8 |
| Operating Mode | Low-power operation |
| RoHS 状态 | Compliant |
| Automotive Qualification | Not qualified |
| Supply Connection | 5 V |
| Package Body Width | 4.9 mm |
SP485EMN-L 4.9 mm 引脚配置指南
SP485EMN-L（4.9 mm 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： SP485EMN-L.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SP485EMN-L 适用于 6 应用s: Industrial Automation Serial Buses, Building Automation Controllers, Factory Data Acquisition, Industrial Sensor and Actuator Nodes, Instrumentation and Test Equipment, Remote Monitoring Gateways.
Industrial Automation Serial Buses
The SP485EMN-L fits industrial automation links requiring a robust half-duplex differential interface. Its 10,000 kbps capability supports factory controller traffic, while the 4.75 V to 5.25 V supply range integrates with conventional 5 V logic. The -40°C to +125°C operating range covers temperature-varied equipment rooms. According to the manufacturer datasheet, ESD tolerance above ±15 kV improves protection during installation and maintenance. Designers should use balanced routing, bus-end termination, and properly placed bias resistors to preserve signal integrity and prevent idle-bus states.
推荐
Building Automation Controllers
SP485EMN-L can connect building automation controllers to balanced field buses where low EMI and electrical robustness are important. The half-duplex arrangement uses one driver and one receiver, conserving interface resources while supporting RS-485 multidrop networks. Its documented 10,000 kbps rate provides ample bandwidth for sensor and actuator commands. The enhanced ±15 kV ESD rating documented by MaxLinear helps withstand field-service transients. A practical implementation should include one bias location, termination only at physical bus ends, surge protection for exposed cable runs, and controlled DE and /RE timing during direction changes.
推荐
Factory Data Acquisition
The SP485EMN-L is appropriate for factory data-acquisition modules that exchange measurements with a supervisory controller over an RS-485 bus. Its 10,000 kbps data rate supports frequent sensor updates, and the single-driver, single-receiver structure fits the bus topology. Low-power BiCMOS operation is useful when many distributed modules share limited power budgets. According to the manufacturer datasheet, the device also provides enhanced ESD tolerance of more than ±15 kV. Engineers should keep the differential pair matched and away from switching nodes, use appropriate termination, and provide local supply decoupling to prevent simultaneous switching disturbances from appearing on the bus.
推荐
Industrial Sensor and Actuator Nodes
SP485EMN-L provides the physical layer for remote sensor and actuator nodes that communicate with a central RS-485 controller. Its half-duplex operation allows a compact node to use one physical bus for commands and telemetry, while the 10,000 kbps rate supports timely updates. The -40°C to +125°C range accommodates industrial enclosures and temperature variation. The datasheet's ±15 kV enhanced ESD performance is particularly useful where cables are repeatedly connected. Low-power behavior is advantageous in distributed installations, but designers should disable the driver except during transmission to reduce bus loading and unnecessary EMI.
推荐
Instrumentation and Test Equipment
The SP485EMN-L is suitable for laboratory and field instrumentation that must exchange commands and measurement data across a balanced RS-485 link. The enhanced low-EMI design helps limit cable emissions in shared test environments, while the 10,000 kbps rate supports high-volume instrument traffic. A 5 V supply range and industrial temperature range support embedded measurement hardware. According to the manufacturer datasheet, enhanced ESD tolerance of more than ±15 kV improves field reliability. Designers should separate the differential pair from sensitive analog inputs, use a single defined bias point, and add external surge protection for cables that leave the enclosure.
推荐
Remote Monitoring Gateways
SP485EMN-L can bridge a local UART controller to an RS-485 network in remote monitoring gateways. The 10,000 kbps rate supports aggregated telemetry, and the half-duplex topology reduces connector and transceiver count compared with separate transmit and receive paths. Its low-power BiCMOS architecture suits compact gateways, while enhanced ±15 kV ESD tolerance improves resilience during installation. According to the MaxLinear datasheet excerpt, the family is designed to meet RS-485 and RS-422 requirements with improved ESD performance. Implementers should disable the driver promptly after transmission, keep the receiver enabled during response reception, and use chassis-ground surge protection for long external cables.
推荐
推荐产品汇总
工程参考数据： SP485EMN-L ——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 | SP485EN-L | SP485ECN-L | SP485EEN-L | LTC1485CS8#PBF | SN75176BDR |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC - same footprint | 8-pin SOIC - same footprint | 8-pin SOIC - same footprint | 8-pin SOIC - same footprint | 8-pin SOIC - same footprint |
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear | Linear Technology | Texas Instruments |
| Product Type | Half-duplex RS-422/RS-485 transceiver | Half-duplex RS-485 transceiver | Half-duplex RS-485 transceiver | Half-duplex RS-485 transceiver | RS-485 transceiver | RS-485 transceiver |
关键差异点
- Higher verified data rate within the comparison set （对比 SP485EN-L)
- Enhanced ESD performance （对比 SP485EEN-L)
- Documented low-power BiCMOS implementation （对比 LTC1485CS8#PBF)
- Industrial temperature coverage （对比 SN75176BDR)
设计说明
Do not enable the driver and receiver in conflicting states on a shared bus. Use DE and /RE control so the driver is disabled except during transmission. A common implementation drives /RE low continuously for receive operation and toggles DE for transmit, but the exact controller logic must avoid bus contention. Confirm that the selected MCU supports the required I/O voltage and direction-control timing.
Route the two differential conductors as a tightly matched pair and keep the route away from switching nodes, crystal circuits, and isolated barrier regions. Place the IC near the connector and supply-decoupling capacitor so transient current from the driver does not traverse sensitive board areas. For exposed cables, add a suitably rated surge-protection network at the connector rather than relying only on the IC's internal ESD structures.
Place the local supply-decoupling network directly between the transceiver supply and ground pins, with a short ground return. Verify that the 5 V rail remains within 4.75 V to 5.25 V during driver activity. Bus termination and fail-safe biasing must be placed so they do not load the receiver excessively, and the power source should accommodate the additional current associated with repeated cable transmissions.
合规信息
The verified comparison data identifies RoHS compliance and states that the device is not automotive qualified. REACH, lead-free, halogen-free, and conflict-minerals status are not provided.