ADM489AR - 250kbps Full-Duplex RS-485/422 | Analog Devices
料号： ADM489AR ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.0539 | $1.05 |
| 10 | $1.529052 | $15.29 |
| 100 | $2.6 | $260.00 |
| 500 | $2.6 | $1,300.00 |
| 1,000 | $2.6 | $2,600.00 |
ADM489AR 概述
An RS-485 transceiver is a physical-layer interface IC that converts logic-level signals into balanced differential bus voltages and receives differential bus voltages back into CMOS-compatible logic. This device belongs to the interface-IC hierarchy, alongside RS-422 transceivers and other differential data-interface products, and sits between a digital controller and a wired communications bus. Full duplex allows the transmitter and receiver to operate simultaneously, which is useful when a node cannot wait for bus turnaround.
Key features include a 250 kbps data rate, one driver and one receiver, 5 V single-supply operation, ±12 V common-mode handling, and controlled slew rate. The slew-rate limitation reduces high-frequency harmonics and reflected-signal problems by preventing excessively fast bus transitions. The 2 kV EFT protection rating is particularly relevant in industrial environments where cables may carry electrostatic-discharge transients.
The ADM489AR integrates separate differential driver outputs and receiver inputs rather than using a single shared multipoint bus segment like a half-duplex transceiver. Its architecture therefore suits point-to-point full-duplex equipment, industrial controllers, and communications links where continuous send and receive capability is required. Exact pin identities, output-disable behavior, receiver enable logic, and detailed electrical limits should be confirmed against the manufacturer datasheet before layout or firmware release.
Typical uses include industrial RS-485 links, RS-422 point-to-point interconnects, factory automation equipment, remote sensor interfaces, and embedded control systems. In a 5 V design, the transceiver can bridge a microcontroller UART and a balanced cable while maintaining compatibility with established differential-bus infrastructure. Compared with half-duplex RS-485 designs, the main system benefit is simultaneous transmission and reception without shared-driver contention.
A key design consideration is that low data rate alone does not eliminate the need for correct bus termination, controlled impedance, common-mode grounding, and transient protection. The differential pair should be routed as a balanced pair, with connector and cable arrangements selected to minimize external noise pickup. Supply decoupling should be placed close to the device, and unused or disabled inputs must be handled according to the datasheet to avoid floating digital nodes.
This product page consolidates verified manufacturer and distributor information, sourced pricing references, engineering application guidance, and honest replacement screening. It distinguishes confirmed facts from parameters that require the datasheet, helping engineers evaluate the ADM489AR for procurement and board-level design without treating merely similar RS-485 devices as verified drop-in replacements.
直接替换替代料： ADM489AR ——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： ADM489AR （相同外形与封装尺寸） ——差异在于 Data Rate, Package, Product Type, Operating Temperature Range, Supported Standards.
快速对比工具——选择替代料号进行并排对比：
ADM489ARZ
✅ 直接替换📋 参考替代料（不在目录中）
MAX489ESD+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX489EESD+
✅ 直接替换📋 参考替代料（不在目录中）
MAX485EESA+
✅ 直接替换✓ 有现货
$1.42 / 个
查看数据手册 →SP485
✅ 直接替换✓ 有现货
$0.97 / 个
查看数据手册 →SN75176BDR
✅ 直接替换✓ 有现货
$0.1055 / 个
查看数据手册 →ADM489AR 规格参数
| Product Type | Full-duplex differential line transceiver |
| Supported Standards | EIA RS-485 and RS-422 |
| 数据速率 | 250 kbps |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Bus Common-Mode Range | -12 V to +12 V |
| Minimum Input Impedance | 12 kΩ |
| EFT Protection | 2 kV |
| EFT Compliance | IEC 1000-4-4 |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Duplex Mode | Full duplex |
| Slew Rate | Slew-rate limited |
| 封装 | 14-pin SOIC, 3.90 mm width |
| 安装类型 | Surface mount |
| 生命周期状态 | Obsolete |
ADM489AR 14-pin soic, 3.90 mm width 引脚配置指南
ADM489AR（14-pin soic, 3.90 mm width 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： ADM489AR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADM489AR 适用于 6 应用s: Industrial RS-485 Control Links, Factory Automation Sensor Interfaces, Point-to-Point RS-422 Interconnect, Remote Monitoring and Telemetry, Instrumentation and Measurement Systems, Building and Automation Networks.
Industrial RS-485 Control Links
The ADM489AR fits slow industrial control links that need balanced differential signaling without sacrificing a simple 5 V interface. Its verified 250 kbps data rate is appropriate for supervisory commands, equipment-state reporting, configuration traffic, and periodic sensor data rather than high-speed streaming. The ±12 V bus common-mode range provides tolerance for grounded systems with voltage offsets, while 2 kV EFT protection addresses fast electrostatic transients commonly encountered on industrial cabling. Use separate transmit and receive pairs when continuous bidirectional communication is required, and verify the complete bus network against the manufacturer application guidance.
推荐
Factory Automation Sensor Interfaces
The ADM489AR can connect an embedded controller to remote sensors over a balanced RS-485 cable when the data rate is modest. Its 250 kbps ceiling is well above the throughput normally required for periodic temperature, pressure, position, or digital I/O reports, and the single 4.5 V to 5.5 V supply simplifies integration with 5 V industrial electronics. The controlled slew rate helps limit high-frequency bus energy, but designers must still provide suitable protection, grounding, and termination. Confirm node count, cable length, isolation requirements, and the operating temperature grade before deployment.
推荐
Point-to-Point RS-422 Interconnect
The ADM489AR is applicable to point-to-point RS-422 equipment requiring simultaneous bidirectional data over balanced conductors. Its full-duplex architecture avoids shared-driver arbitration and permits continuous communication between two fixed endpoints, making it useful for test systems, industrial controllers, and remote equipment links. The verified 250 kbps rate supports moderate command and response traffic rather than high-bandwidth payloads. Pair it with controlled-impedance routing, suitable series or termination components specified by the system design, and common-mode protection where the two devices can sit at different ground potentials.
推荐
Remote Monitoring and Telemetry
The ADM489AR can carry periodic telemetry from a remote monitoring unit when continuous transmission and reception are useful but throughput requirements are limited. A 250 kbps link provides substantial capacity for status words, configuration data, and sampled measurements, while the differential bus improves noise immunity over long industrial cables. The 2 kV EFT rating is relevant when monitoring equipment connects through exposed wiring. Engineers should still assess surge and lightning threats, cable routing, shield termination, isolation, and grounding because EFT protection alone does not replace a complete industrial protection strategy.
推荐
Instrumentation and Measurement Systems
The ADM489AR can bridge a test instrument or measurement controller to another system when a reliable balanced communication channel is required. Its full-duplex operation permits commands to be sent while results return, and its slew-rate-limited driver reduces aggressiveness on long cables compared with unrestricted high-edge-rate solutions. The 250 kbps rate is suitable for control commands, calibration records, and buffered measurement results. For laboratory or field instruments, add the required transient, surge, and isolation protection based on the cable environment, and verify grounding to avoid introducing measurement offsets through bus current.
推荐
Building and Automation Networks
The ADM489AR is suitable for low-speed building automation subnets where controllers exchange commands and sensor states over a balanced bus. Its 250 kbps limit and full-duplex operation fit supervisory communication rather than video or high-bandwidth building data. The ±12 V common-mode capability can assist interoperability among grounded equipment, and 2 kV EFT protection is relevant for cables running near motors and switching loads. Installation quality remains critical: maintain the intended bus topology, use proper termination, route the differential pair together, and protect any conductors exposed to severe surge conditions.
推荐
推荐产品汇总
工程参考数据： ADM489AR ——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 | ADM489ARZ | MAX489ESD+T | MAX489EESD+ | MAX485 | SP485 | SN75176B |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Maxim Integrated | Maxim Integrated | Maxim Integrated | Lattice Semiconductor | Texas Instruments |
| Package | SOIC-14, 3.90 mm width | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 |
关键差异点
- Verified full-duplex interface with one driver and one receiver （对比 MAX485)
- Documented industrial transient resilience （对比 SP485)
- Broader verified common-mode tolerance （对比 SN75176B)
- Known 250 kbps application class （对比 MAX489ESD+T)
设计说明
Route the differential bus as a controlled-impedance pair with minimal stubs and avoid sharing the return-current path with unrelated high-current switching nodes. Keep transceiver, protection components, and termination arranged so transient current returns through a short ground path. The 2 kV EFT rating helps only when the PCB and grounding system direct the disturbance away from sensitive logic, so enclosure, cable shield, and chassis-ground strategy must be considered together.
Place the transceiver's supply-decoupling network immediately adjacent to its power and ground pins, and route it with a short ground return. Keep the 5 V supply within the verified 4.5 V to 5.5 V range and check source impedance during bus transitions. Add bulk capacitance where remote cable charging or protection-device pulses require it, but place that energy storage away from sensitive analog sections and verify ripple at the IC rather than assuming a generic capacitor value is sufficient.
Do not assume every similarly described RS-485 or RS-422 transceiver is pin compatible. Compare driver-enable, receiver-enable, shutdown, ground, supply, and differential I/O assignments against the 14-pin ADM489AR pinout, then check voltage limits, common-mode range, data rate, fail-safe behavior, and temperature grade. Half-duplex parts may require a direction-control pin and shared bus node, while full-duplex devices route separate transmit and receive pairs, creating an immediate PCB incompatibility.
合规信息
The supplied search results do not explicitly establish RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The product is an industrial interface IC, so AEC-Q100 qualification is treated as not applicable based on the available product class, not as a manufacturer qualification claim.
