SP3485EN-L - 10Mbps 3.3V RS-485/RS-422 Transceiver
料号： SP3485EN-L ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.2813 | $0.28 |
| 10 | $0.2813 | $2.81 |
| 100 | $0.2813 | $28.13 |
| 500 | $0.2813 | $140.65 |
| 1,000 | $0.2813 | $281.30 |
SP3485EN-L 概述
A half-duplex transceiver is a physical-layer interface IC that shares one differential bus connection between a transmitter and receiver. The driver converts logic-level signals into a differential RS-485 or RS-422 output, while the receiver converts the differential bus voltage back into a logic signal. Direction control determines whether the integrated driver, receiver, or both paths are active on a shared bus.
Key verified features include operation from a 3.135 V to 3.465 V supply, support for RS-485 and RS-422 serial protocols, a 10 Mbps data rate, and pin-to-pin compatibility claims for Exar SP481, SP483, and SP485 devices and popular industry standards. The MaxLinear page also describes the family as using BiCMOS technology for low-power operation without sacrificing performance. Additional electrical limits, protection levels, temperature range, and pin-level details were not present in the supplied evidence.
Typical uses include industrial control links, building automation, instrumentation, gateways, embedded serial networks, and RS-422 point-to-point links. The 3.3 V supply makes the part suitable for systems where a modern low-voltage controller or transceiver is used. At 10 Mbps, trace routing, connector geometry, termination, and grounding become especially important; the bus should be treated as a controlled transmission-line environment rather than an arbitrary wire length.
The principal design check is electrical compatibility with the intended bus. Confirm supply voltage, driver and receiver topology, direction-control logic, bus termination, fail-safe behavior, and transceiver pin mapping before layout release. The supplied snippets support the 3.135 V to 3.465 V supply and 10 Mbps data-rate claims, but they do not provide complete pinout, absolute-maximum-rating, or package-dimension tables.
This product page consolidates manufacturer and distributor evidence, cross-reference findings, application guidance, and design cautions into a practical engineering reference. It does not invent missing electrical parameters and clearly identifies values that still require confirmation from the complete MaxLinear datasheet.
直接替换替代料： SP3485EN-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： SP3485EN-L （相同外形与封装尺寸） ——差异在于 Package, Product Type, Data Rate, Supply Voltage Range, Mounting Type.
快速对比工具——选择替代料号进行并排对比：
SP481
✅ 直接替换📋 参考替代料（不在目录中）
SP483
✅ 直接替换📋 参考替代料（不在目录中）
SP485
✅ 直接替换✓ 有现货
$0.97 / 个
查看数据手册 →MAX3485ESA+
✅ 直接替换✓ 有现货
$1.45 / 个
查看数据手册 →SN65HVD11P
✅ 直接替换📋 参考替代料（不在目录中）
SP3485EN-L 规格参数
| Product Type | RS-485/RS-422 half-duplex transceiver |
| Supply Voltage Range | 3.135 V to 3.465 V |
| Nominal Supply | 3.3 V |
| 数据速率 | 10 Mbps |
| Driver Count | 1 |
| Receiver Count | 1 |
| Duplex Mode | Half-duplex |
| Supported Protocols | RS-485 and RS-422 |
| 封装 | 8-SOIC |
| 安装类型 | Surface mount |
| Process Technology | BiCMOS |
| Pin Compatibility | Pin-to-pin compatible with Exar SP481, SP483, and SP485 devices and popular industry standards |
| Low-Power Operation | Low-power family specification |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| Lead-Free Status | unknown |
SP3485EN-L 8-soic 引脚配置指南
SP3485EN-L（8-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： SP3485EN-L.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SP3485EN-L 适用于 6 应用s: Industrial RS-485 Control Links, Building Automation Networks, Embedded Instrumentation Interfaces, RS-422 Point-to-Point Communication, Gateway and Data-Acquisition Modules, Motor and Sensor Control Networks.
Industrial RS-485 Control Links
SP3485EN-L fits low-voltage industrial control, sensor aggregation, and actuator-control links that use RS-485 and need up to 10 Mbps operation. Its one-driver, one-receiver, half-duplex arrangement allows a controller to share a differential bus with multiple nodes while keeping the interface compact in an 8-SOIC package. The verified 3.135 V to 3.465 V supply range is compatible with 3.3 V system rails. In a practical design, use the transceiver's direction control to prevent simultaneous transmission, place it close to the connector, and verify termination and grounding against the cable impedance. The absence of a verified temperature or ESD rating means industrial qualification must be checked separately.
推荐
Building Automation Networks
SP3485EN-L can provide the physical RS-485 interface for low-voltage building-automation controllers, room modules, gateways, and field I/O nodes. The 3.3 V supply suits compact embedded equipment, while the 10 Mbps capability provides margin for short, well-controlled links between controllers and sensors. The shared half-duplex bus simplifies wiring compared with separate full-duplex pairs, but direction control must be deterministic and bus idle behavior must remain compatible with every node. Check the complete datasheet for fail-safe receiver behavior, ESD performance, and temperature limits before specifying the device for occupied building environments.
推荐
Embedded Instrumentation Interfaces
SP3485EN-L is suitable for embedded instrumentation that exchanges commands or measurements over a short differential bus. The 3.3 V operating point can simplify connection to modern microcontrollers, and the 10 Mbps rate is sufficient for many local control and measurement paths. Place the transceiver near the protected connector or cable entry, route the differential pair as a controlled impedance pair, and keep return-current paths continuous. The supplied evidence confirms protocol support and data rate but does not provide verified receiver thresholds, noise immunity, or cable-length limits, so those values must be established from the full datasheet before production release.
推荐
RS-422 Point-to-Point Communication
For point-to-point RS-422 links, SP3485EN-L provides a 3.3 V differential driver and receiver in a half-duplex arrangement. It can be used between two embedded systems when the application accepts shared transmit and receive wiring and uses proper direction control. The 10 Mbps rating is useful for short, controlled connections, while the 8-SOIC footprint keeps the interface compact. Cable length and rate are jointly constrained by loss, skew, impedance, and receiver performance, none of which are fully quantified in the supplied snippets. Validate the link budget with the actual cable and the complete receiver specifications.
推荐
Gateway and Data-Acquisition Modules
SP3485EN-L can bridge a 3.3 V host UART to an external RS-485 or RS-422 field bus in gateways, data loggers, and acquisition modules. Its single half-duplex channel is appropriate for a bus connection where the host manages transmission permission and handles protocol framing above the physical layer. A 10 Mbps capability can reduce serialization bottlenecks in short local links, but it does not replace correct termination or common-mode control. Place the transceiver near the field connector, provide a defined ground strategy, and use the host's hardware direction signal to avoid contention during bus turnaround.
推荐
Motor and Sensor Control Networks
SP3485EN-L can serve as the communication interface for a compact motor-control or sensor-control subsystem that uses a 3.3 V control board and an RS-485 bus. The one-driver, one-receiver topology supports a shared half-duplex bus, while the 10 Mbps rate is more than sufficient for many short command and feedback paths. The transceiver should be placed at the protected edge of the board, with differential routing kept continuous through connectors and away from switching nodes. Because the supplied evidence does not confirm industrial temperature, surge, or ESD limits, those requirements must be checked before using the part in a motor environment.
推荐
推荐产品汇总
工程参考数据： SP3485EN-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 | SP481 | SP483 | SP485 | MAX3485ESA | SN65HVD11P |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | Exar | Exar | Exar | Maxim Integrated | Texas Instruments |
关键差异点
- Verified 10 Mbps class for local differential links （对比 SP485)
- Low-voltage 3.3 V family positioning （对比 SP485)
- Direct pin-to-pin family compatibility （对比 SP485)
- BiCMOS low-power process positioning （对比 SP481)
设计说明
At the verified 10 Mbps data rate, route the differential pair as a controlled-impedance, tightly coupled pair from the transceiver to the connector. Minimize stubs, vias, and discontinuities, and keep the pair away from switching regulators and high-current return paths. The supplied evidence does not specify a required characteristic impedance, so use the system interconnect specification and verify with the complete datasheet and measured hardware.
Do not assume that any 8-SOIC RS-485 transceiver is automatically a substitute. The supplied evidence claims pin compatibility with SP481, SP483, and SP485, but the complete pin names, direction-control polarity, receiver thresholds, supply limits, and electrical timing must still be compared. Especially verify the exact ordering suffix and package drawing before using an alternative on an existing PCB.
Place the transceiver close to the external connector so the differential traces remain short and protected from radiated or conducted noise. Keep the connector ground and transceiver ground in the same low-impedance return path, and provide local supply decoupling according to the complete manufacturer layout guidance. The supplied snippets do not specify the required capacitor values, so do not substitute guessed values into a released schematic.
The verified SP3485EN-L supply range is 3.135 V to 3.465 V, so the system rail must remain within that range during startup, load transients, and supply tolerance. Confirm that the host UART and any protection devices use compatible 3.3 V logic levels. Supply sequencing, current budget, and transceiver quiescent current are not fully supplied and should be verified from the complete datasheet before power-budgeting the board.
For a half-duplex bus, provide deliberate control of driver enable and receiver enable or direction timing. Ensure the host cannot transmit while another node owns the bus, and allow the receiver path to settle before interpreting the first bit after direction reversal. The supplied data confirms half-duplex operation but does not provide exact enable timing, so use the manufacturer timing limits rather than relying on nominal software delays.
合规信息
The supplied verification snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for SP3485EN-L. Compliance must be confirmed from current manufacturer or distributor documentation.
