SP490CN-L - 5Mbps RS-485/RS-422 Transceiver | MaxLinear
料号： SP490CN-L ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.5831 | $1.58 |
| 10 | $1.45 | $14.50 |
| 100 | $1.2 | $120.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.95 | $950.00 |
SP490CN-L 概述
An RS-485/RS-422 transceiver is an interface IC that combines a differential line driver and differential receiver into one package. The driver converts a logic signal into a balanced differential transmission, while the receiver converts the differential pair back into a logic signal. This interface class belongs to the broader hierarchy of interface ICs, communication transceivers, and semiconductor signal-conditioning devices used in industrial control, instrumentation, and point-to-point data systems.
The verified manufacturer material identifies the SP490 as a low-power BiCMOS RS-485/RS-422 transceiver capable of operation to 5 Mbps. The receiver sensitivity is specified as ±200 mV, and the family is available in 8-pin plastic DIP and NSOIC packages. The SP491 is a related family member with additional driver and receiver tri-state enable lines, but it is not an interchangeable substitute for every SP490 design because its control-pin arrangement differs.
The SP490CN-L is suitable for industrial communication links, data acquisition equipment, instrumentation, and embedded control systems using differential buses. Its 5 V supply simplifies integration with conventional 5 V logic systems, while the differential interface helps reject common-mode noise on longer cable runs. Designers must still account for termination, biasing, grounding, and protection-network requirements in the complete RS-485 or RS-422 interface.
For PCB implementation, place the transceiver close to the connector and route the differential pair as a controlled-impedance pair with minimal stub length. Keep the ground reference continuous under the interface, use appropriate surge protection for exposed cabling, and verify that the receiver remains enabled or disabled as required by the bus architecture. The SP490CN-L datasheet is the authoritative source for electrical limits, pin assignments, and package details.
直接替换替代料： SP490CN-L ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SP490CN-L/TR
✅ 直接替换📋 参考替代料（不在目录中）
LTC490IS8#PBF
✅ 直接替换📋 参考替代料（不在目录中）
SP491CN-L
✅ 直接替换📋 参考替代料（不在目录中）
SP490CN-L 规格参数
| Product Type | RS-485/RS-422 differential line transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Maximum Data Rate | 5 Mbps |
| 电源电压 | 5 V |
| Receiver Input Sensitivity | ±200 mV |
| Receiver Common-Mode Range | Wide common-mode range |
| Logic Standard | RS-485 and RS-422 |
| Driver/Receiver Architecture | BiCMOS |
| 封装 | 8-pin SOIC |
| Package Family | NSOIC |
| Related Family Member | SP491 with driver and receiver tri-state enable lines |
| ESD Qualification | ±15 kV IEC 61000-4-2 and ±15 kV HBM |
| Operating Application | Industrial communication and instrumentation |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| AEC-Q100 Status | unknown |
SP490CN-L 引脚配置
| 引脚 1 | ROUTE — Receiver output data |
| 引脚 2 | RE — Receiver enable input |
| 引脚 3 | DE — Driver enable input |
| 引脚 4 | DI — Driver input data |
| 引脚 5 | GND — Ground |
| 引脚 6 | A — Non-inverting driver output and receiver input |
| 引脚 7 | B — Inverting driver output and receiver input |
| 引脚 8 | VCC — Positive supply |
典型应用
SP490CN-L 适用于 6 应用s: Industrial RS-485 Control Bus, Data Acquisition Instrumentation, Embedded Controller Communication, Factory Automation Equipment, Instrumentation and Test Systems, Building and Environmental Monitoring.
Industrial RS-485 Control Bus
The SP490CN-L fits industrial control and monitoring links that require a 5 V differential interface capable of operation up to 5 Mbps. Its one-driver/one-receiver arrangement supports point-to-point RS-485 or RS-422 links when the board uses the correct termination and bias network. The ±200 mV receiver sensitivity helps the system recognize the intended differential signal while rejecting common-mode noise, although cable length, topology, grounding, and connector design remain important. Because the SP490 does not provide the SP491’s separate tri-state enable lines, firmware and hardware should be designed around the SP490 control configuration.
推荐
Data Acquisition Instrumentation
Use the SP490CN-L as the physical-layer interface between an instrumentation controller and external sensors or measurement equipment. The 5 Mbps capability is suitable for transferring digitized or control data over short, properly terminated differential links, while the low-power BiCMOS implementation helps manage system power. The receiver’s ±200 mV sensitivity supports reliable detection of the differential voltage in a noisy industrial environment. PCB designers should keep the transceiver close to the connector, provide a continuous ground path, and validate the complete interface against the actual cable length and termination arrangement.
推荐
Embedded Controller Communication
The SP490CN-L can connect an embedded controller to a remote peripheral over an RS-485 or RS-422 differential bus. Its 5 V supply operation aligns with many conventional controller boards, and its 5 Mbps maximum rate provides margin for short industrial links. The interface is appropriate when the design needs noise-tolerant differential signaling instead of a single-ended UART connection. Ensure that the bus topology is compatible with the chosen standard, place termination only where required by the topology, and confirm whether the SP490’s fixed operating mode matches the controller’s bus-management requirements.
推荐
Factory Automation Equipment
SP490CN-L is appropriate for factory automation modules that exchange commands and status between controllers, remote I/O, and machine interfaces. Differential RS-485 signaling can improve immunity to industrial noise compared with a single-ended connection, particularly when cable routing passes near motors and switching equipment. The transceiver’s 5 Mbps rating supports high-speed short-distance communication, but long cables or heavily branched buses require careful analysis. Use a continuous ground reference, proper termination, surge protection at exposed connectors, and an industrial temperature/ESD review before deployment.
推荐
Instrumentation and Test Systems
The SP490CN-L can serve as a differential communications interface in test and measurement equipment that must exchange commands and results with a host controller. The 5 Mbps rate is ample for many short-distance control and status links, while RS-485/RS-422 compatibility supports use in systems designed around differential instrumentation buses. Its 5 V operation simplifies integration with conventional test electronics. For laboratory equipment, verify ground-loop strategy, cable shielding, termination values, and whether the transceiver’s receiver behavior meets the expected idle or fail-safe conditions.
推荐
Building and Environmental Monitoring
SP490CN-L can be used in distributed monitoring systems where sensor nodes or controllers communicate over short RS-485 or RS-422 links. The differential interface helps preserve data integrity when cable runs pass near building power and control systems, while the 5 Mbps limit provides adequate speed for status and command traffic. The receiver sensitivity of ±200 mV supports detection of the intended differential signal, but installers still need proper grounding and termination. If nodes are connected over longer distances, assess cable attenuation, common-mode range, surge exposure, and node isolation before finalizing the design.
推荐
推荐产品汇总
工程参考数据： SP490CN-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 | SP490CN-L/TR | LTC490IS8#PBF | SP491CN-L |
|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | Linear Technology | MaxLinear |
| Package | 8-pin SOIC | 8-pin SOIC - same | SOIC-8 - same package family | 8-pin NSOIC - same package family |
| Logic Standard | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 family candidate | RS-485 and RS-422 |
关键差异点
- SP490CN-L/TR is the same core SP490 ordering path （对比 SP490CN-L)
- SP491 family adds explicit tri-state control （对比 SP491CN-L)
- Candidate second source may support the same differential-interface class （对比 LTC490IS8#PBF)
设计说明
Route the SP490CN-L differential pair as a short, impedance-controlled pair from the transceiver to the connector. Minimize stubs and keep the A/B pair over a continuous ground reference. For RS-485, use termination only where the system topology requires it; for RS-422, follow the standard’s termination and bias requirements. Validate rise time, reflections, and receiver margin with the actual cable length and baud rate.
Do not assume SP491 behavior is available on SP490CN-L. The manufacturer describes SP491 as the related part with driver and receiver tri-state enable lines, so adding or changing enable logic can alter pin compatibility. Confirm the exact SP490 pinout and enable polarity in the official datasheet before making a PCB change or second-source substitution.
Place the transceiver and its protection components near the external connector. Keep the ground return continuous, provide a low-impedance supply path, and place any termination or bias network close to the appropriate line endpoint. For exposed cables, evaluate surge and ESD protection separately from the SP490’s verified ±15 kV IEC 61000-4-2 and ±15 kV HBM qualification claims.
合规信息
The verified cross-reference material states that the Exar/MaxLinear SP490 family is qualified up to ±15 kV IEC 61000-4-2 and ±15 kV HBM, but the supplied data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for the exact SP490CN-L ordering suffix.