ADM483EAR - 250 kbps RS-485 Transceiver | Analog Devices
MPN: ADM483EAR ✓ ActiveADM483EAR Overview
An RS-485 transceiver is an interface IC that converts logic-level serial data into a differential physical signal for communication over balanced cabling. It belongs to the transceiver hierarchy within RS-485 and RS-422 interface ICs, where a differential driver transmits logic states onto a twisted-pair bus and a differential receiver converts the returning differential signal into CMOS-compatible logic. The ADM483EAR is designed for half-duplex systems in which the same pair of conductors carries data in either direction, but only one transmitter is active at a time.
The ADM483EAR supports operation from a single 4.5 V to 5.5 V supply, a 250 kbps maximum signaling rate, and a ±12 V common-mode range on the bus. These characteristics make it appropriate for industrial equipment, building controls, instrumentation, and embedded systems using balanced multipoint buses. Its ±15 kV ESD protection improves robustness at connector locations where cables can be attached or disconnected, while the reduced slew rate helps reduce edge-related EMI compared with unrestricted-speed line drivers.
The receiver incorporates communication-rate and slew-rate limiting to control bus behavior. These functions are especially useful in multipoint networks because they reduce the amount of high-frequency energy placed onto the cable. The device can participate in buses containing up to 32 transceivers, according to the manufacturer datasheet. Because its driver is intended for half-duplex operation, the design must control the driver-enable and receiver-enable inputs so that the bus is not driven during reception.
Typical applications include industrial RS-485 links between controllers and sensors, factory-floor equipment, remote I/O modules, building-automation nodes, and instrumentation connected over long shielded or unshielded twisted-pair cables. In these systems, the low 250 kbps rate provides useful tolerance for wiring, propagation delay, reflections, and electromagnetic coupling. The ±12 V bus common-mode capability also helps the receiver tolerate voltage differences between grounded systems connected through the communication cable.
PCB design should provide a continuous return path between the transceiver ground and the system ground, keep the differential pair route short where possible, and place termination and protection components near the bus connector. A common-mode choke can reduce conducted emissions when required, but it should be selected for the actual data rate and cable impedance. The supply bypass capacitor should be placed close to the VCC and GND pins to minimize high-frequency supply impedance.
This page combines the manufacturer’s electrical limits, interface guidance, verified lifecycle information, package details, drop-in alternatives, and application-oriented design notes. It is intended to help engineers assess protocol compatibility, bus topology, protection strategy, and PCB implementation before integrating the ADM483EAR into an RS-485 or RS-422 design.
Drop-in alternatives for ADM483EAR — 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 ADM483EAR (same form factor and footprint) — differing in Package, Product Type, ESD Protection, Number of Drivers, Number of Receivers.
ADM483EAN
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD3082EDR
✅ Drop-InContact for price
View Datasheet →MAX3070EESD+
✅ Drop-InContact for price
View Datasheet →SP485EMN-L/TR
✅ Drop-InContact for price
View Datasheet →ISO1042BDWR
✅ Drop-InContact for price
View Datasheet →ADM483EAR Specifications
| Product Type | RS-485/RS-422 half-duplex line transceiver |
| Supply Voltage | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Maximum Data Rate | 250 kbps |
| ESD Protection | ±15 kV |
| Bus Common-Mode Range | -12 V to +12 V |
| Maximum Bus Nodes | 32 transceivers |
| Driver and Receiver Count | 1 driver and 1 receiver |
| Duplex Mode | Half-duplex |
| Slew Rate | Slew-rate limited |
| Interface Standards | TIA/EIA RS-485 and RS-422 |
| Package | 8-pin SOIC |
| Mounting Type | Surface mount |
| Lifecycle Status | Production |
ADM483EAR Pin Configuration
| Pin 1 | RO — Receiver output |
| Pin 2 | /RE — Active-low receiver enable |
| Pin 3 | DE — Driver enable |
| Pin 4 | DI — Driver input |
| Pin 5 | GND — Ground |
| Pin 6 | Y — Driver output and receiver input for non-inverting bus line |
| Pin 7 | A — Driver output and receiver input for inverting bus line |
| Pin 8 | VCC — Positive supply voltage |
Typical Applications
ADM483EAR is suitable for 6 applications: Industrial Sensor and Controller Networks, Building Automation and Remote I/O, Factory Automation Equipment, Instrumentation and Test Equipment, Security and Access-Control Networks, Embedded Communications Modules.
Industrial Sensor and Controller Networks
The ADM483EAR is suited to half-duplex RS-485 links connecting industrial controllers, remote sensors, and actuator modules over a twisted-pair bus. Its 250 kbps maximum rate is adequate for periodic measurement and command traffic, while the slew-rate-limited driver reduces high-frequency cable energy. The -12 V to +12 V common-mode range helps the receiver tolerate voltage differences between grounded industrial equipment. Designers should preserve a continuous ground reference, use a termination strategy appropriate to the bus topology, and verify surge protection at the cable entry.
Recommended
Building Automation and Remote I/O
In building-control systems, the ADM483EAR can connect room controllers, lighting interfaces, HVAC modules, and remote I/O units over a balanced RS-485 network. The 250 kbps rate supports management and status traffic without requiring a high-speed differential PHY, and the ±15 kV ESD protection adds robustness where field wiring connects to external equipment. The half-duplex architecture requires firmware to arbitrate transmitter access, and the board layout should keep the differential route continuous and away from switching power nodes.
Recommended
Factory Automation Equipment
The ADM483EAR is appropriate for factory equipment that exchanges commands and diagnostic data with programmable controllers over a multipoint bus. Its 32-node capability supports a network of distributed field devices, while the reduced slew rate limits EMI on cables running near motors and switching converters. The 5 V supply integrates easily with embedded control systems, although half-duplex direction control must prevent bus contention. Keep the transceiver close to the connector, provide local bypassing, and use surge and common-mode protection where the cable leaves the enclosure.
Recommended
Instrumentation and Test Equipment
The ADM483EAR can link laboratory instruments, data loggers, and calibration equipment using RS-485 or RS-422. The 250 kbps rate is appropriate for commands, measurement results, and status reporting, and the balanced interface helps reject common-mode noise coupled from test equipment. For RS-422 point-to-point links, the device can operate without multiple active drivers, but enable logic and termination still require careful configuration. Shielding, a common ground path, and controlled cable routing are important near switching supplies and high-energy test sources.
Recommended
Security and Access-Control Networks
The ADM483EAR can support half-duplex communication between access-control panels, card readers, door controllers, and alarm modules. The 250 kbps class is suitable for low-bandwidth command traffic, while the reduced slew rate and ±12 V common-mode range improve compatibility with building wiring that may connect equipment at different ground potentials. The interface is not an isolated safety barrier, so installations with very large ground offsets should evaluate an isolated transceiver. Firmware should enforce bus-access timing and prevent simultaneous transmitter activation.
Recommended
Embedded Communications Modules
The ADM483EAR provides a simple physical layer for embedded modules that must exchange command and telemetry data with a host controller over a multipoint cable. Its single 5 V supply, 250 kbps limit, and 8-pin SOIC footprint simplify implementation in compact control boards. The microcontroller must drive the driver-enable and receiver-enable inputs, and the bus protocol should include node addressing and collision avoidance. Place the device near the connector, preserve differential trace symmetry, and provide adequate copper grounding to stabilize return currents.
Recommended
Recommended Products Summary
Engineering reference data for ADM483EAR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM483EAN | SN65HVD3082EDR | MAX3070EESD+ | SP485EMN-L/TR |
|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices | Microchip Technology |
| Duplex Mode | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
| Isolation | Non-isolated | Non-isolated | Non-isolated | Non-isolated | Non-isolated |
Key Differentiators
- Documented ESD protection for connector-side exposure (vs SP485EMN-L/TR)
- Defined multipoint-bus capability (vs SN65HVD3082EDR)
- Low 250 kbps rate improves long-cable and EMC margin (vs MAX3070EESD+)
- Direct non-isolated interface without an isolation barrier (vs ISO1042BDWR)
Design Notes
Place the ADM483EAR close to the RS-485 connector and route the A and Y conductors as a tightly coupled differential pair. Keep the pair away from switching nodes and maintain a continuous ground reference beneath or beside the route where practical. Place the local VCC bypass capacitor directly between pins 8 and 5, and place bus-side protection or termination components near the connector rather than beside the transceiver.
Do not allow multiple nodes to enable their drivers simultaneously. The ADM483EAR is a half-duplex interface, so firmware must control DE and /RE correctly and provide enough turnaround time before the receiver samples the bus. Tie unused enable inputs to defined logic levels instead of leaving them floating, and verify that the selected alternative uses the same enable polarity before replacing the device.
The reduced slew rate helps lower cable emissions, but system EMC performance still depends on cable construction, termination, common-mode impedance, and connector shielding. Use the 250 kbps operating limit when calculating propagation delay and reflection timing. A common-mode choke can improve conducted-noise performance, but its impedance must remain compatible with the cable, baud rate, and termination network.
The single 5 V supply simplifies system power design, but the VCC rail must remain within 4.5 V to 5.5 V at the transceiver pins. Use low-impedance decoupling close to the package and avoid sharing a long, narrow supply path with motors, relays, or switching converters. Account for startup current and bus-driver loading when choosing the regulator and bulk capacitance.
Compliance Information
The ADM483 family is listed as production by Analog Devices. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the manufacturer’s current material-compliance documentation.