ADM485JRZ - 5V 5Mbps RS-485 Transceiver | Analog Devices
料号： ADM485JRZ ✓ 量产中ADM485JRZ 概述
An RS-485 transceiver is a physical-layer interface IC that converts logic-level signals into differential bus signals and receives differential bus signals back into logic-level outputs. In the product hierarchy, it is a differential line transceiver within interface ICs and a semiconductor. Its differential signaling improves common-mode noise immunity, while the RS-485 standard supports communication over shared multipoint cabling when correctly terminated and biased.
The ADM485 family combines a 5 Mbit/s data rate with low-power operation and short propagation delays. These characteristics suit industrial communication links where low channel skew and rapid switching help reduce timing margins and electromagnetic-interference concerns. Its 8-pin SOIC package also provides a small surface-mount footprint for compact interface sections in control systems, instrumentation, and communications equipment.
The architecture includes dedicated differential driver outputs and receiver inputs, and both functions can be enabled independently according to the cited component description. Independent control supports bus designs that need to listen without actively driving the line, as well as arrangements where transmit and receive timing is managed by external control logic. Exact propagation-delay, slew-rate, and power-consumption values are not supplied in the verified excerpts and should be taken from the manufacturer datasheet.
Typical uses include industrial RS-485 buses, RS-422 point-to-point links, factory data acquisition, building-control networks, instrumentation, and data communications between embedded controllers and peripheral modules. For multipoint RS-485 networks, cable length, topology, termination, biasing, and common-mode limits must be evaluated together; the transceiver alone does not determine reliable maximum bus distance.
The primary design consideration is verifying pin functions, supply sequencing, signal polarity, and transceiver-enable timing against the exact ADM485JRZ datasheet. Designers should also use the manufacturer-specified protection and bypass strategies, provide a clean 5 V supply, and validate termination and fail-safe behavior across cable lengths and system grounding conditions.
This page consolidates the verified manufacturer and distributor information, compares potential SOIC-8 replacements, and adds application guidance and design checks that help engineers evaluate ADM485JRZ beyond a basic distributor specification table.
直接替换替代料： ADM485JRZ ——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： ADM485JRZ （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature Range, Protocol, Supply Voltage.
ADM485ARZ
✅ 直接替换联系询价
查看数据手册 →ADM4850ARZ
✅ 直接替换📋 参考替代料（不在目录中）
ADM4856AR
✅ 直接替换📋 参考替代料（不在目录中）
THVD1550
✅ 直接替换联系询价
查看数据手册 →ADM483JRZ
✅ 直接替换📋 参考替代料（不在目录中）
ADM485JRZ 规格参数
| Product Type | RS-485/RS-422 differential line transceiver |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 5 Mbits/s |
| Communication Mode | Half-duplex |
| Supported Standards | EIA RS-485 and RS-422 |
| Driver Output Count | 1 differential driver |
| Receiver Input Count | 1 differential receiver |
| Driver and Receiver Control | Independently enabled |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Temperature Grade | Commercial and industrial temperature range |
ADM485JRZ 8-pin soic 引脚配置指南
ADM485JRZ（8-pin 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： ADM485JRZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADM485JRZ 适用于 6 应用s: Industrial RS-485 Control Bus, Factory Automation and Robotics, Building and HVAC Network, Data Acquisition and Instrumentation, Point-to-Point RS-422 Link, Embedded Communications Module.
Industrial RS-485 Control Bus
The ADM485JRZ fits an industrial controller or data-acquisition module that communicates with distributed sensors and actuators over an RS-485 bus. Its 4.75 V to 5.25 V operating range suits conventional 5 V interface sections, while its capability up to 5 Mbit/s supports fast polling and short, controlled inter-node links. The differential driver and receiver provide balanced signaling with better common-mode noise immunity than a single-ended interface. Designers should use the transceiver near the connector, apply suitable bus protection, and validate termination and cable length. The 5 Mbit/s capability is a device limit rather than a guarantee for every topology, so environmental noise, grounding, cable impedance, and propagation delay must be checked against the deployed bus.
推荐
Factory Automation and Robotics
The ADM485JRZ can connect a robot controller, programmable controller, or sensor hub to a factory network that uses balanced RS-485 links. Operation from a 4.75 V to 5.25 V rail permits use with 5 V digital interface hardware, and the 5 Mbit/s maximum data rate is useful for deterministic short-distance command and status traffic. Independent driver and receiver enable control allows the node to remain in receive mode while other devices communicate. At industrial sites, however, motor drives and switching equipment can inject substantial noise onto field cables. The implementation should include the datasheet-recommended protection network, careful grounding, a defined fail-safe state, and validation with the actual cable and enclosure. Candidate replacements must preserve enable timing and bus thresholds, not merely the nominal data rate.
推荐
Building and HVAC Network
The ADM485JRZ is appropriate for a building-control controller, HVAC gateway, or environmental monitor that exchanges reliable commands over an RS-485 backbone. Its balanced differential signaling is well suited to building wiring that may run near motors, lighting controls, or other switching loads, while the 5 V supply range integrates with common controller logic. The 5 Mbit/s capability gives design teams substantial timing headroom for short building segments, although practical network range will usually be governed by topology and environmental conditions. Firmware should include node addressing, collision or turnaround management, and bus-recovery behavior. The hardware design should reserve space for termination, fail-safe biasing, surge protection, and optional isolation. Any substitute should be checked for receiver thresholds and enable polarity because those parameters determine behavior during bus idle and startup states.
推荐
Data Acquisition and Instrumentation
The ADM485JRZ can bridge a laboratory instrument, multi-channel data logger, or test system to a host computer using an RS-485 or RS-422 connection. Its maximum 5 Mbit/s rate supports efficient transfer of synchronized measurements, while independently controlled transmit and receive paths help implement deterministic command-and-response protocols. For bench-top systems, the 8-pin SOIC package leaves useful board area for protection, isolation, and connector circuitry. The differential interface reduces susceptibility to common-mode voltage found in industrial environments, but it does not remove the need for a defined ground reference. Engineers should separate sensitive measurement paths from transceiver switching currents, provide local supply bypassing, and verify that the selected cable does not introduce excessive delay. Replacement parts should be compared for skew and propagation delay when deterministic timing is important.
推荐
Point-to-Point RS-422 Link
The ADM485JRZ can also implement an RS-422 point-to-point link between two equipment locations where full-duplex-style driver and receiver resources are managed separately. The verified product information confirms compatibility with both RS-485 and RS-422 and describes dedicated differential outputs and inputs. The 5 V supply range and 8-pin SOIC package are practical for compact peripheral boards, while the 5 Mbit/s capability supports short high-speed links. Unlike a multidrop RS-485 bus, an RS-422 design generally provides separate differential conductors for each direction, reducing contention concerns. Cabling, grounding, and common-mode limits remain critical over longer runs. Engineers should confirm the exact receiver and driver enable states, avoid leaving an output actively driving an undriven bus, and compare replacements on propagation-delay matching as well as maximum rate.
推荐
Embedded Communications Module
The ADM485JRZ is suitable for an embedded communications module that adds a robust differential port to a microcontroller or programmable logic controller. The host can use serial logic signals to enable transmission and receive data, while the physical layer handles balanced line signaling. Its 4.75 V to 5.25 V range is compatible with 5 V systems, and operation up to 5 Mbit/s allows a compact module to support high-rate command links or bridging functions. Because the transceiver can be configured for RS-422 as well as RS-485, the same hardware family can address point-to-point and multipoint networks. Firmware and hardware must define turnaround timing to prevent bus contention. Designers should also consider a watchdog, bus-fail-safe behavior, connector protection, and exposed-ground strategy. An alternative should be approved only after confirming its enable polarity, fault-state output, and exact footprint.
推荐
推荐产品汇总
工程参考数据： ADM485JRZ ——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 | ADM485ARZ | ADM4850ARZ | THVD1550 | ADM483JRZ |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same |
| Product Type | RS-485/RS-422 transceiver | RS-422/RS-485 transceiver | RS-485/RS-422 transceiver | RS-485 transceiver | RS-485/RS-422 transceiver |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Maximum Data Rate | 5 Mbit/s | 5 Mbit/s | 5 Mbit/s | 5 Mbit/s | 5 Mbit/s |
| Communication Mode | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
| Supported Standards | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 | RS-485 and RS-422 |
| Driver and Receiver Control | Independently enabled | Independently enabled | Independently enabled | Independently enabled | Independently enabled |
| Bus Topology | Multipoint bus and point-to-point | Multipoint bus and point-to-point | Multipoint bus and point-to-point | Multipoint bus | Multipoint bus and point-to-point |
关键差异点
- Verified high-speed 5 Mbit/s capability （对比 ADM485ARZ)
- 8-pin SOIC drop-in footprint （对比 THVD1550)
- Independent driver and receiver enable control （对比 ADM4850ARZ)
- Dual RS-485 and RS-422 compatibility （对比 THVD1550)
设计说明
Place the ADM485JRZ close to the bus connector and place its protection network between the transceiver pins and external connector. Keep the differential pair together, route it away from switching nodes and high-current paths, and use a continuous ground reference where the system permits it. The 5 Mbit/s capability makes trace mismatch and discontinuous return paths more consequential. Confirm the final pin arrangement, bus-side components, and connector surge requirements against the manufacturer datasheet before releasing the PCB.
Do not assume that equal package dimensions guarantee a safe drop-in replacement. Verify the numbered SOIC-8 pinout, driver-enable polarity, receiver-enable polarity, bus-idle output state, common-mode range, and propagation timing for every candidate. In particular, THVD1550 appears in the supplied material as a compatibility question rather than a confirmed substitute. Bench-test the proposed part with the intended termination, fail-safe biasing, cable, and system ground before approving a production substitution.
The ADM485's 5 Mbit/s capability enables fast differential signaling but does not remove conducted or radiated emissions. Use the shortest practical connection to the connector, provide a solid reference plane, and apply the manufacturer-recommended protection and fail-safe network. Avoid long stubs from the main bus because they can act as unterminated branches and increase reflections. Measure emissions and bus waveforms at the intended data rate with the final enclosure, power supply, cable, and loading conditions.
Design the interface around a clean nominal 5 V rail because the verified operating range is 4.75 V to 5.25 V. Place local decoupling at the transceiver supply pins and keep the supply return path continuous through the interface section. Do not power the bus directly from the transceiver; external drivers, termination, and protection components may require additional rail capability. Confirm the actual supply current, quiescent current, and driver load from the complete manufacturer datasheet before sizing the regulator and thermal margin.
合规信息
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The commercial and industrial temperature grades make AEC-Q100 qualification not applicable to the standard ADM485JRZ ordering code.