ADM485AR - Low-Power RS-485/RS-422 Transceiver | Analog Devices
MPN: ADM485AR ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ADM485AR Overview
An RS-485 transceiver is an interface IC that combines a differential line driver, differential receiver, and bidirectional bus-control logic. It converts logic-level signals between a host or controller and a balanced cable, allowing noise rejection and reliable communication over longer distances than an unbalanced interface. In the system hierarchy, the ADM485AR belongs to interface ICs and transceiver ICs, where differential signaling supports multipoint industrial, instrumentation, and automation buses.
The verified Analog Devices description confirms that the ADM485 is intended for balanced data transmission and complies with EIA RS-485 and RS-422 standards. Both the driver and receiver can be enabled according to the manufacturer result, which supports controlled bus operation and integration with external direction-control logic. The ADM485AR part number is associated with an 8-SOIC package in the DigiKey result.
Applications include industrial control systems, factory automation equipment, instrumentation, building-control networks, and other balanced multipoint communication links. The differential architecture helps reject common-mode noise, while the external bus transceiver architecture makes cable termination, biasing, grounding, and protection important design considerations.
For a new board, use the official manufacturer datasheet to verify the complete pinout, electrical limits, recommended circuit, and package dimensions before layout. This page distinguishes verified facts from parameters that require confirmation and does not infer unprovided ratings or timing values.
The useful comparison point is not merely the RS-485 label: check driver and receiver enable behavior, bus direction control, fail-safe behavior, ESD protection, common-mode range, propagation delay, and package pin compatibility. Those details determine whether another part is a true drop-in replacement.
Drop-in alternatives for ADM485AR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADM485AR (same form factor and footprint) — differing in Package, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM485ARZ
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADM4852AR
✅ Drop-In📋 Reference alternative (not in catalog)
ADM4856AR
✅ Drop-In📋 Reference alternative (not in catalog)
ADM4851AR
✅ Drop-In📋 Reference alternative (not in catalog)
ADM4853AR
✅ Drop-In📋 Reference alternative (not in catalog)
ADM485AR Specifications
| Product Type | Differential line transceiver |
| Supported Standards | EIA RS-485 and RS-422 |
| Supply Voltage | 5 V |
| Driver Count | 1 |
| Receiver Count | 1 |
| Communication Mode | High-speed bidirectional |
| Bus Architecture | Multipoint balanced transmission line |
| Driver and Receiver Enable | Driver and receiver can be enabled |
| Signal Type | Differential balanced signaling |
| Package | 8-pin SOIC |
| RoHS | unknown |
| REACH | unknown |
| AEC-Q100 | unknown |
ADM485AR 8-pin soic Pin Configuration Guide
Pin configuration for ADM485AR (8-pin soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ADM485AR.
Refer to the datasheet for full pin configuration.
Typical Applications
ADM485AR is suitable for 6 applications: Industrial Automation Bus, Building Automation Network, Instrumentation and Sensor Networks, Data Acquisition Gateways, Motor and Power-Control Equipment, Industrial Communication Modules.
Industrial Automation Bus
The ADM485AR is appropriate for a factory automation controller that must communicate over a balanced RS-485 multidrop bus. Its verified support for RS-485 and differential line transmission provides a direct interface between digital control logic and field equipment, while the external transceiver architecture allows bus direction and enable timing to be coordinated by the controller. Use controlled impedance routing, termination at physical bus ends, and bias resistors for an idle differential state. Because the supplied data does not state data rate, common-mode range, or temperature limits, those values must be checked against the manufacturer datasheet before selecting cable length and baud rate.
Recommended
Building Automation Network
The ADM485AR can be used in a building-control node for balanced communication between a controller and distributed sensors, actuators, or dimming modules. Differential signaling helps reduce sensitivity to common-mode interference encountered when cables run near power wiring or motors. The 5 V transceiver should be placed near the cable entry point, with a controlled differential pair and protection network to reduce surge exposure. The supplied verified material does not provide the device’s operating temperature, ESD rating, or fail-safe thresholds, so environmental requirements and receiver idle behavior must be confirmed from the manufacturer documentation.
Recommended
Instrumentation and Sensor Networks
The ADM485AR fits instrumentation links where a measurement device or sensor interface must exchange data over a balanced cable rather than a short point-to-point TTL connection. The receiver and driver provide the physical layer for RS-485 or RS-422-compatible equipment, allowing longer cable runs with better noise immunity than unbalanced logic. Designers should select termination values for the actual cable impedance, maintain common ground or isolation practices, and verify the maximum data rate against propagation delay. The verified source identifies the product as a 5 V, one-driver, one-receiver transceiver in an 8-SOIC package.
Recommended
Data Acquisition Gateways
The ADM485AR can be used at an edge gateway to connect a legacy RS-485 field bus to a host processor or embedded controller. Its differential transceiver role is useful when several remote acquisition modules share a cable and noise or ground-potential differences threaten a single-ended interface. The board design should isolate logic and power appropriately, add cable-side protection, and define the termination and idle-bias network for the network topology. The supplied data does not confirm isolation, surge withstand, or exact receiver thresholds; therefore, those requirements must be validated rather than inferred.
Recommended
Motor and Power-Control Equipment
The ADM485AR is suitable for control and status links around motor starters, power converters, and remote I/O when the cable is exposed to electrically noisy equipment. Differential line signaling helps reject common-mode disturbances that can corrupt an unbalanced control signal, provided the board uses a proper reference or isolation strategy and correctly terminated bus. Keep the transceiver and protection components near the external connector, avoid long unprotected stubs, and separate sensitive analog routing from the cable entry. The supplied material does not provide the device’s maximum common-mode voltage or ESD rating, so industrial protection must be designed from verified limits.
Recommended
Industrial Communication Modules
The ADM485AR can serve as the physical interface inside a compact RS-485 communication module connected to an embedded controller. Its one-driver and one-receiver arrangement matches the verified DigiKey description and supports balanced bus communication in a surface-mount 8-SOIC package. A module designer should expose the bus connector with robust grounding, add transient protection, and document whether the interface is half-duplex or controlled-direction full-duplex. The device’s enable logic, timing, and electrical ratings must be taken from the complete datasheet because the supplied snippets do not specify them.
Recommended
Recommended Products Summary
Engineering reference data for ADM485AR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM485ARZ | ADM4852AR | ADM4856AR | ADM4851AR | ADM4853AR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
Key Differentiators
- Verified RS-485 and RS-422 support (vs ADM4852AR)
- Confirmed one-driver, one-receiver architecture (vs ADM4856AR)
- Official manufacturer documentation and 8-SOIC package identification (vs ADM4851AR)
Design Notes
Route the RS-485 differential pair as a controlled-impedance pair with closely matched spacing and minimal stubs. Keep the transceiver close to the cable connector so external transient energy is clamped before it reaches sensitive logic. Add protection with low capacitance and route the return or reference path deliberately; the supplied data does not specify an ESD rating, so protection selection must be based on the actual cable exposure and verified device limits.
Do not assume that every 8-SOIC RS-485 transceiver is pin-compatible. The ADM485AR’s exact pin names, enable polarity, receiver thresholds, and timing were not included in the supplied snippets. Before substituting ADM485ARZ, ADM4852AR, ADM4856AR, ADM4851AR, or ADM4853AR, compare the official pin diagrams and verify that the external direction-control, bias, termination, and connector circuits remain valid.
The verified device is identified as a 5 V transceiver, but current consumption, driver output limits, and logic-level thresholds are not provided. Confirm the supply range, local decoupling requirements, output-current budget, and thermal performance in the manufacturer datasheet. Use separate, short supply paths for logic and bus-side protection, and verify that cable-side protection does not disturb the intended differential signal.
Termination and biasing depend on whether the board represents one bus endpoint or an interior node. Place termination so it can be enabled only at the physical ends of the multidrop cable, and provide a controlled idle differential state with bias resistors where required. Confirm resistor values using the actual cable impedance, node count, and the manufacturer’s recommended application circuit rather than copying values without checking the network topology.
Compliance Information
The supplied verified sources do not explicitly state compliance declarations for ADM485AR. Compliance should be confirmed with Analog Devices or an authorized distributor.