SP485EEN-L - 10Mbps Half-Duplex RS-485 IC | MaxLinear
料号： SP485EEN-L ✓ 量产中SP485EEN-L 概述
An RS-485 transceiver is an interface IC that converts logic-level transmit and receive signals into differential bus voltages. The SP485EEN-L combines one transmitter and one receiver in a half-duplex arrangement, so the driver and receiver share the same differential pair. In the hierarchy of electronic components, it belongs to interface ICs and specifically to the RS-485 transceiver family used for industrial automation, instrumentation, and building systems.
The verified manufacturer information identifies a 4.75 V to 5.25 V supply range, operation from -40 C to +85 C, and enhanced ESD tolerance exceeding 15 kV using both the Human Body Model and the IEC1000-4-2 air-discharge method. The low-power architecture is intended to reduce system consumption, while enhanced ESD capability improves robustness in electrically noisy installations. A 10,000 kbps rate also supports communication rates commonly required by RS-485 equipment.
The SP485E and SP481E family is designed as a half-duplex RS-422 and RS-485 interface with pin-to-pin compatibility with Exar SP481 and SP485 devices and other industry-standard implementations. The SOIC-8 package supports conventional surface-mount assembly. Because the device is half-duplex, firmware and external direction-control logic must prevent the transmitter and receiver from driving the bus simultaneously.
Typical uses include industrial RS-485 links between controllers and sensors, factory automation equipment, remote instrumentation, building-control networks, and data-acquisition systems. The differential interface is particularly useful where ground-potential differences and external noise could impair a single-ended communication path. Its 10,000 kbps capability allows it to serve both moderate-speed control networks and faster point-to-point links.
Designers should include bus termination, biasing, protection, and a controlled DE/RE direction sequence. The transmitter should be disabled while receiving, and enable pins should not be allowed to float. A termination resistor belongs at each end of the main bus segment rather than at every node, while transient protection may be added when the cable leaves a protected enclosure.
This product page consolidates verified manufacturer information, distributor availability and pricing, package details, cross-reference candidates, and practical RS-485 design guidance. It also distinguishes documented drop-in candidates from package-compatible parts that still require datasheet verification before substitution.
直接替换替代料： SP485EEN-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： SP485EEN-L （相同外形与封装尺寸） ——差异在于 Data Rate, Package, RoHS Status, Product Type, Protocol.
SP485ECN-L
✅ 直接替换联系询价
查看数据手册 →SP485EN-L
✅ 直接替换联系询价
查看数据手册 →SP485EN-L
✅ 直接替换联系询价
查看数据手册 →SP485EEP
✅ 直接替换📋 参考替代料（不在目录中）
MAX485ESA+
✅ 直接替换联系询价
查看数据手册 →SP485EEN-L 规格参数
| Product Type | Half-duplex RS-422/RS-485 transceiver |
| Transmitter and Receiver Count | 1 transmitter and 1 receiver |
| 数据速率 | 10,000 kbps |
| Alternate Family Data Rate | Up to 5 Mbps |
| 工作电源电压 | 4.75 V to 5.25 V |
| 工作温度范围 | -40 C to +85 C |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| ESD Tolerance, Human Body Model | Greater than 15 kV |
| ESD Tolerance, Air Discharge Method | Greater than 15 kV under IEC1000-4-2 |
| Supported Protocols | RS-422 and RS-485 |
| Duplex Mode | Half-duplex |
| Power Classification | Low-power interface IC |
| EMI Characteristics | Enhanced low-EMI design |
SP485EEN-L 引脚配置
| 引脚 1 | RO — Receiver output |
| 引脚 2 | /RE — Receiver enable, active low |
| 引脚 3 | DE — Driver enable |
| 引脚 4 | DI — Driver input |
| 引脚 5 | GND — Ground |
| 引脚 6 | A — Non-inverting differential bus terminal |
| 引脚 7 | B — Inverting differential bus terminal |
| 引脚 8 | VCC — Positive supply |
典型应用
SP485EEN-L 适用于 6 应用s: Industrial Automation RS-485 Networks, Building Control and HVAC Networks, Remote Instrumentation and Data Acquisition, Security and Access-Control Systems, Telecom Power and Monitoring Equipment, Point-of-Sale and Retail Equipment.
Industrial Automation RS-485 Networks
The SP485EEN-L fits industrial automation links that require a 10,000 kbps half-duplex RS-485 interface, a 4.75 V to 5.25 V supply, and operation from -40 C to +85 C. Place it between a controller UART and a differential field bus to convert logic-level transmit and receive signals into RS-485 bus levels. Its enhanced ESD tolerance exceeding 15 kV under the Human Body Model and IEC1000-4-2 air-discharge method is valuable when cables connect field equipment through exposed connectors. The implementation must use controlled DE and RE logic, appropriate bus termination, and protection suited to the installation environment.
推荐
Building Control and HVAC Networks
SP485EEN-L is appropriate for half-duplex building-control and HVAC networks that distribute supervisory commands over an RS-485 bus. Its 10,000 kbps capability accommodates common controller-to-controller traffic, while the -40 C to +85 C range supports equipment installed outside tightly controlled ambient conditions. The IC converts the host UART signals to differential bus voltage and receives returning data on the same pair. Engineers should arrange the bus so only one transmitter is active at a time, place termination at the physical ends, and use biasing to maintain a defined state when no node drives the line.
推荐
Remote Instrumentation and Data Acquisition
The SP485EEN-L can connect remote sensors, meters, and laboratory acquisition modules to a central controller through a half-duplex RS-485 link. Its verified 10,000 kbps product-page rate supports a balance between measurement throughput and reliable differential transmission, while enhanced ESD performance helps protect the interface from electrostatic discharge on operator-accessible cables. Connect the transceiver to the controller UART and use DE/RE control to alternate between command transmission and response reception. For long cables or large ground-potential differences, an isolated interface such as the P82B96DR may provide a more appropriate protection boundary.
推荐
Security and Access-Control Systems
SP485EEN-L can support half-duplex access-control panels, credential readers, and alarm modules distributed over an RS-485 wiring backbone. The 4.75 V to 5.25 V supply matches common 5 V controller electronics, and the enhanced ESD rating exceeding 15 kV is useful around door controllers and cables that may be exposed to electrostatic discharge. One transceiver can handle requests from a host and responses from field modules when the firmware manages direction control correctly. Shielded cable, a common reference strategy, and surge protection should be specified according to the installation rather than relying on interface ESD protection alone.
推荐
Telecom Power and Monitoring Equipment
The SP485EEN-L is useful in telecom power shelves, environmental monitors, and remote equipment interfaces that use half-duplex RS-485 management buses. Its 10,000 kbps rate supports management traffic without requiring a high-speed differential transceiver, and its -40 C to +85 C operating range is relevant to equipment installed in varied ambient conditions. The transceiver links an embedded controller UART to the management bus while enhanced ESD protection helps the interface withstand field-port discharge events. Use controlled DE/RE sequencing and verify cable length, termination, and grounding against the deployed power shelf topology.
推荐
Point-of-Sale and Retail Equipment
SP485EEN-L supports compact RS-485 peripherals used in retail systems, including scales, receipt printers, customer displays, and payment-terminal accessories. The half-duplex topology reduces wiring compared with separate differential pairs, while the 10,000 kbps rate is sufficient for typical command and response traffic. The 8-pin SOIC package allows placement close to the equipment controller, and the verified -40 C to +85 C range covers many indoor commercial environments. Firmware should maintain a strict transmitter-enable interval and wait for the final response byte before returning the bus to receive mode to prevent collisions.
推荐
推荐产品汇总
工程参考数据： SP485EEN-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 | SP485ECN-L | SP485EN-L | SP485EN | SP485EEP | MAX485ESA+ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same package | 8-SOIC - same package | 8-SOIC - same package | 8-SOIC - same package | 8-SOIC - same package |
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear | MaxLinear | Analog Devices |
| Duplex Mode | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
| Protocol Support | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 | RS-485 |
关键差异点
- Enhanced ESD protection （对比 MAX485ESA+)
- Verified industrial temperature coverage （对比 MAX485ESA+)
- Direct manufacturer continuity within the SP485E family （对比 MAX485ESA+)
设计说明
Keep the transceiver, protection devices, and bus-connection components close to the cable entry. Route the differential A and B conductors together with a consistent ground reference where the system architecture permits it, and avoid long unprotected copper traces from the SOIC-8 pins to external connectors. The manufacturer identifies enhanced ESD capability, but good placement still reduces the energy that must be clamped by external protection and lowers susceptibility to unintended bus coupling.
Never allow DE and /RE to be enabled simultaneously in a way that creates bus contention. For half-duplex operation, assert driver enable only while transmitting and release it after the stop bit; receiver enable can usually remain active unless echo elimination is required. Pull or actively drive the control inputs so they do not float during reset. Firmware should also verify that every node releases the bus before another node transmits.
Operate the interface from a supply inside the verified 4.75 V to 5.25 V range. Place local high-frequency bypass capacitance close to VCC and ground, and provide adequate system-level decoupling without relying exclusively on long traces to a distant capacitor. Check supply tolerance, startup sequencing, and transient excursions against the manufacturer limits before using the device in an industrial enclosure where an input surge could exceed the IC rating.
Install termination only at the two physical ends of the main RS-485 cable run, not at every node. Use biasing to establish a stable idle state when all transmitters are disabled, and select the bias values for the actual network topology and node count. Keep switching regulators, high-current motors, and their return paths away from the differential pair because external radiated and conducted noise can dominate the advantage of the interface even when the transceiver itself has enhanced ESD protection.
合规信息
The supplied verified data confirms enhanced ESD capability under the Human Body Model and IEC1000-4-2 air-discharge method, but it does not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than being inferred from general industry expectations.