Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Signal isolation | 2500 V rms for 1 minute (UL 1577) |
| Data rate | 20 Mbps |
| Duplex | Half duplex |
| Logic-side supply | 3 V or 5 V (VDD1) |
| Bus-side supply | External isolated 5 V (VDD2) |
| Bus nodes | 50 |
| CMTI | >25 kV/µs |
| Protocol note | PROFIBUS compliant |
| Package | 16-lead SOIC_W, RW-16 |
| Operating temperature | −40°C to +85°C |
Product Overview
ADM2486BRWZ-REEL is a high-speed galvanically isolated half-duplex RS-485 transceiver specified to 20 Mbps and for PROFIBUS operation. It integrates the digital isolation barrier with the differential driver and receiver.
Unlike isoPower-equipped transceivers, ADM2486 does not generate isolated bus-side power internally. VDD1 can use a 3 V or 5 V logic supply, while VDD2 requires a separately isolated 5 V source. This is a major architecture decision when comparing isolated RS-485 parts.
Key Features
- 20 Mbps half-duplex isolated RS-485 operation.
- 2.5 kV rms signal isolation and >25 kV/µs CMTI.
- PROFIBUS compliance and up to 50 bus nodes.
- Separate logic-side and isolated bus-side supplies.
Functional Highlights
Signal isolation and power isolation are separate responsibilities with ADM2486; an external isolated 5 V rail is required on the bus side.
At 20 Mbps, termination, stub length, connector discontinuities, and driver-enable timing have a larger effect on signal integrity than in slower links.
Application Fit
- Isolated RS-485/RS-422 interfaces.
- PROFIBUS networks.
- Industrial field networks.
- High-speed multipoint data transmission systems.
Design Considerations
- Provide a properly isolated 5 V VDD2 supply; do not assume integrated isoPower.
- Use controlled bus routing and correct termination for 20 Mbps signaling.
- Coordinate driver-enable timing to avoid contention.
- Maintain the RW-16 isolation barrier in the PCB layout.
Product Status
Manufacturer status: PRODUCTION
Analog Devices currently lists ADM2486BRWZ-REEL as PRODUCTION.
Related Engineering Resources
Alternative Candidates for Engineering Evaluation
| MPN | Manufacturer | Package |
|---|---|---|
| ADM2486BRWZ | ADI | SOIC-16-300mil |
| ISO1176TDWR | TI | SOIC-16-300mil |
| ISO1176DWR | TI | SOIC-16-300mil |
| ISO3088DWR | TI | SOIC-16-300mil |
| ISO3088DW | TI | SOIC-16-300mil |
| MAX14939GWE+ | MAXIM | SOIC-16-300mil |
| MAX14940GWE+T | MAXIM | SOIC-16-300mil |
| MAX14940GWE+ | MAXIM | SOIC-16-300mil |
| CA-IS3088WX | Chipanalog | SOIC-16-300mil |
Candidate alternative parts require engineering verification before substitution. Electrical characteristics, pinout, package, qualification, and application requirements should be verified before use.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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To request a quotation, provide the exact manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
