ADM485JNZ - 5V 5Mbps RS-485/422 Transceiver | Analog Devices
料号： ADM485JNZ ✓ 量产中ADM485JNZ 概述
A differential line transceiver is an interface IC that combines a transmit driver and receive comparator for balanced communication links. Within the hierarchy of interface ICs, the ADM485JNZ belongs to the RS-485/RS-422 transceiver class and converts logic-level signals into noise-resistant differential bus signals. This category supports communication between distributed nodes over longer cables than ordinary single-ended logic interfaces.
Key features include a 5 Mbps maximum data rate, low-power BiCMOS construction, fast switching behavior, a +12 V bus common-mode range, and protection against short-circuit and thermal overload. The device provides separate driver-enable and receiver-enable control, allowing the transmitter and receiver to be switched independently. These characteristics suit industrial control, instrumentation, factory automation, and other multidrop systems where reliable signaling and controlled bus contention are important.
The ADM485 uses differential signaling to improve noise immunity and reduce electromagnetic-interference emissions relative to a single-ended interface. Minimal driver propagation delay permits high-speed transmission, while low skew helps reduce EMI interference between transitions. Because the verified product description identifies one transmitter and one receiver, systems requiring multiple bus nodes must add additional transceivers rather than treating the part as a multi-drop controller.
Typical applications include RS-485 industrial networks, RS-422 point-to-point links, programmable logic controller and sensor interfaces, building-automation equipment, and factory data buses. In these systems, the ADM485JNZ can sit between a host UART or microcontroller and a twisted-pair bus. Termination, biasing, grounding, and protocol-level turnaround control remain important system-level considerations.
When implementing the interface, verify the 4.75 V to 5.25 V supply requirement and design the bus network with appropriate termination at the physical endpoints. Avoid relying on the transceiver alone for surge, ground-offset, or isolated protection. The 8-pin PDIP package is also mechanically incompatible with the SOIC and MSOP versions of the ADM485 family, making package selection critical during replacement.
This product analysis consolidates verified manufacturer information, distributor pricing, package details, lifecycle data, and pin-to-pin replacement guidance. It also distinguishes the available same-footprint alternatives from surface-mount and cross-package family variants so engineers can make a replacement decision without assuming electrical equivalence implies mechanical compatibility.
直接替换替代料： ADM485JNZ ——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： ADM485JNZ （相同外形与封装尺寸） ——差异在于 Maximum Data Rate.
ADM485JN
✅ 直接替换📋 参考替代料（不在目录中）
ADM485ANZ
✅ 直接替换📋 参考替代料（不在目录中）
ADM485JNZ 规格参数
| Transceiver Configuration | 1 transmitter and 1 receiver |
| Supported Protocols | EIA RS-485 and EIA RS-422 |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 5 Mbps |
| Bus Common-Mode Range | +12 V |
| Logic Interface | Differential driver and differential receiver |
| Driver Enable Control | Logic-controlled input |
| Receiver Enable Control | Logic-controlled input |
| Circuit Technology | Low-power BiCMOS |
| Thermal Protection | Thermal shutdown protection |
| Output Protection | Short-circuit protection |
| Package Type | 8-pin PDIP |
| Package Pitch | 7.62 mm |
| Package Form Factor | 8-DIP, 0.300 inch |
| Packaging | Tube |
| 安装类型 | Through-hole |
| RoHS 状态 | ROHS3 compliant |
ADM485JNZ 引脚配置
| 引脚 1 | RO — Receiver output |
| 引脚 2 | RE — Receiver enable input, active low |
| 引脚 3 | DE — Driver enable input, active high |
| 引脚 4 | DI — Driver data input |
| 引脚 5 | GND — Ground |
| 引脚 6 | A — Noninverting differential bus terminal |
| 引脚 7 | B — Inverting differential bus terminal |
| 引脚 8 | VCC — Positive supply |
典型应用
ADM485JNZ 适用于 6 应用s: Industrial RS-485 Control Networks, RS-422 Point-to-Point Links, PLC and Sensor Bus Interfaces, Factory Automation Equipment, Building Automation and Environmental Monitoring, Instrumentation and Test Equipment.
Industrial RS-485 Control Networks
The ADM485JNZ fits industrial control networks that require balanced differential signaling at rates up to 5 Mbps. It places one differential driver and one differential receiver between a controller and a multipoint RS-485 bus, while the 4.75 V to 5.25 V supply range matches conventional 5 V logic systems. Its +12 V common-mode capability and short-circuit protection improve robustness in factory environments, although the final system still requires termination, grounding, and external surge protection.
推荐
RS-422 Point-to-Point Links
For point-to-point RS-422 links, the ADM485JNZ provides a 5 V differential driver and receiver in an 8-pin PDIP package. The verified family supports rates up to 5 Mbps, making it appropriate for equipment-to-equipment links where balanced wiring improves noise immunity. The transmitter and receiver have separate enable inputs, allowing a system to control bus direction locally, though a complete half-duplex interface may still require external direction logic and bus termination.
推荐
PLC and Sensor Bus Interfaces
The ADM485JNZ is suitable for connecting a PLC, data-acquisition controller, or sensor gateway to a field bus. Its one-driver, one-receiver arrangement supports a practical multidrop node architecture where each participant uses an addressable protocol above the physical layer. At rates up to 5 Mbps and with a 4.75 V to 5.25 V supply range, it accommodates conventional industrial logic while differential signaling helps reject common-mode noise encountered near motors, relays, and long cable runs.
推荐
Factory Automation Equipment
Factory automation equipment benefits from the ADM485JNZ because it combines a 5 Mbps-capable differential transceiver with thermal shutdown and short-circuit protection. The device can bridge a controller UART to a distributed RS-485 network carrying position, temperature, or equipment-state information. The +12 V bus common-mode range helps accommodate normal industrial offsets, while low-power BiCMOS construction supports compact embedded modules. Engineers should still isolate noisy field wiring and validate cable length against the selected data rate.
推荐
Building Automation and Environmental Monitoring
The ADM485JNZ can connect environmental sensors, room controllers, and building-automation nodes over a shared RS-485 backbone. Its differential bus interface is useful where cable routing passes near lighting controls, pumps, and other potential noise sources, while separate driver and receiver enables permit controlled bus access. The 5 V supply simplifies integration with embedded controllers. Low-rate building networks can use the same transceiver, but cable length, termination, topology, and protocol timing must be checked rather than assuming the 5 Mbps rating applies at every distance.
推荐
Instrumentation and Test Equipment
Instrumentation systems can use the ADM485JNZ to connect a measurement controller to remote sensors, fixtures, or laboratory equipment over RS-485. The 5 Mbps maximum data rate supports high-speed laboratory data paths, while differential signaling reduces susceptibility to externally coupled noise. The 8-pin PDIP format is useful for leaded industrial modules and prototypes. Designers should define termination and fail-safe biasing for idle states, isolate external cables where appropriate, and verify that common-mode transients remain within the transceiver's stated limits.
推荐
推荐产品汇总
工程参考数据： ADM485JNZ ——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 | ADM485JN | ADM485ANZ |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin PDIP | 8-pin PDIP - same | 8-pin PDIP - same |
| Transceiver Configuration | 1 driver / 1 receiver | 1 driver / 1 receiver | 1 driver / 1 receiver |
| Supported Protocols | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 |
关键差异点
- Through-hole 8-PDIP construction （对比 ADM485ARZ)
- 5 Mbps-capable differential interface （对比 ADM485JN)
- Integrated short-circuit and thermal protection （对比 ADM485ANZ)
设计说明
Route the ADM485JNZ differential pair A and B as a tightly coupled twisted pair to minimize radiated emissions and susceptibility to coupled noise. Keep the transceiver close to the connector and place transient-protection devices at the cable entry rather than allowing unprotected traces to extend deep into the board. Provide a solid ground reference and minimize stubs from each transceiver to the main bus.
Do not allow multiple drivers to transmit simultaneously on an RS-485 bus. Because the ADM485JNZ driver and receiver have separate enable inputs, software or external logic must enforce exclusive bus access and sufficient turnaround time. Confirm whether the receiver is disabled during transmission, since leaving RE active can cause the receiver to interpret the driven bus as incoming data in some multidrop arrangements.
Termination and biasing belong in the physical network rather than in every node. Place termination at the two physical ends of the bus, normally with a resistance value selected from the cable impedance, and use only the amount of fail-safe bias required by the system. Excessive termination or multiple bias sources can overload the ADM485JNZ driver and reduce the usable common-mode margin.
Decouple the 5 V supply close to the transceiver with the capacitance recommended by the manufacturer data sheet and current Analog Devices application guidance. Keep switching-regulator or digital-supply return currents out of the A and B paths. Because the verified excerpts do not provide a complete supply-current table or recommended capacitor value, those values must be obtained from the current ADM485 data sheet before release to production.
合规信息
The verified ICSuperman listing identifies ADM485JNZ as ROHS3 compliant. No verified REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statement was supplied.