ADM2491EBRWZ - Isolated RS-485 Transceiver | Analog Devices
MPN: ADM2491EBRWZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
Drop-in alternatives for ADM2491EBRWZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM2491EBRWZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2491EBRWZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2483BRWZ
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →ADM2483BRWZ-RL7
✅ Drop-In✓ In Stock
$4.16 / Unit
View Datasheet →ISO3082DW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO35DW
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2491EBRWZ Maximum Ratings & Electrical Characteristics
| Technology | RS485 |
| Device Type | Transceiver |
| Supply Voltage | 5 V |
| Operating Temperature | -40 to 105 °C |
| Package Type | SOIC-16 (0.295", 7.50mm Width) |
| Pins | 16 |
| Isolation Voltage | 5000 Vrms |
| Number of Channels | 3 |
| Data Rate | 16 Mbps |
| CMTI | 25 kV/µs |
| ESD Protection | ±8 kV |
| Duplex | Half/Full |
| RoHS | Compliant |
| Lead Free | Yes |
| Mounting Type | Surface Mount |
ADM2491EBRWZ Pin Configuration
| Pin 1 | VDD1 — Logic-side supply voltage (3.0V to 5.5V) |
| Pin 2 | GND1 — Logic-side ground |
| Pin 3 | DI — Driver input |
| Pin 4 | RO — Receiver output |
| Pin 5 | RE — Receiver enable (active low) |
| Pin 6 | DE — Driver enable (active high) |
| Pin 7 | GND1 — Logic-side ground |
| Pin 8 | NC — No connect |
| Pin 9 | VISO — Isolated-side supply voltage (5V) |
| Pin 10 | GND2 — Isolated-side ground |
| Pin 11 | A — Receiver input non-inverting |
| Pin 12 | B — Receiver input inverting |
| Pin 13 | Z — Driver output inverting |
| Pin 14 | Y — Driver output non-inverting |
| Pin 15 | GND2 — Isolated-side ground |
| Pin 16 | VISO — Isolated-side supply voltage (5V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADM2491EBRWZ is suitable for 6 applications: Industrial Fieldbus Networks, Motor Control and Drives, Building Automation, Isolated Data Acquisition, Power Inverters and Solar, Transportation and Rail.
Industrial Fieldbus Networks
The ADM2491EBRWZ is ideal for industrial fieldbus networks such as PROFIBUS and Modbus. Its 16 Mbps data rate and 5000 Vrms isolation ensure reliable communication over long distances in noisy industrial environments. The high CMTI of 25 kV/µs prevents data corruption from fast transients, while ±8 kV ESD protection safeguards the bus pins. The device supports both half-duplex and full-duplex operation, making it versatile for various network topologies. Its wide operating temperature range (-40°C to +105°C) ensures performance in harsh conditions.
Recommended
Motor Control and Drives
In motor control systems, the ADM2491EBRWZ provides galvanic isolation between the controller and the motor drive, protecting sensitive electronics from high-voltage transients and ground loops. Its 16 Mbps data rate supports high-speed communication for real-time control, while the 5000 Vrms isolation ensures safety in high-voltage environments. The device's high CMTI (25 kV/µs) is crucial in motor drives where fast switching creates significant common-mode noise. The wide temperature range and robust ESD protection make it suitable for industrial motor control cabinets.
Recommended
Building Automation
The ADM2491EBRWZ is well-suited for building automation systems, including HVAC, lighting, and access control. Its 5000 Vrms isolation protects against ground potential differences between floors and buildings, while the 16 Mbps data rate supports high-speed communication for real-time monitoring and control. The device's low power consumption and wide temperature range make it ideal for always-on systems. The ±8 kV ESD protection ensures reliability in environments where static discharge is common, such as when technicians connect or disconnect cables.
Recommended
Isolated Data Acquisition
For data acquisition systems, the ADM2491EBRWZ provides isolation between sensors and the data acquisition unit, preventing ground loops and reducing noise. Its 16 Mbps data rate allows high-speed sampling, while the 5000 Vrms isolation protects against high common-mode voltages in industrial settings. The device's high CMTI ensures accurate data transmission even in the presence of fast transients. The full-duplex capability enables simultaneous data transmission and reception, which is useful for real-time monitoring systems.
Recommended
Power Inverters and Solar
In power inverters and solar systems, the ADM2491EBRWZ provides isolation between the control electronics and the high-voltage power stage. Its 5000 Vrms isolation ensures safety and prevents ground loops, while the 16 Mbps data rate supports fast communication for monitoring and control. The high CMTI (25 kV/µs) is essential in power electronics where switching transients are common. The device's wide temperature range and robust ESD protection make it suitable for outdoor installations.
Recommended
Transportation and Rail
The ADM2491EBRWZ is suitable for transportation and rail applications, including train control and monitoring systems. Its 5000 Vrms isolation protects against high common-mode voltages in traction systems, while the 16 Mbps data rate supports high-speed communication for safety-critical data. The device's wide temperature range (-40°C to +105°C) and high CMTI ensure reliable operation in harsh environments. The ±8 kV ESD protection is crucial in applications where cables are frequently connected and disconnected.
Recommended
Recommended Products Summary
Engineering reference data for ADM2491EBRWZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM2491EBRWZ-REEL7 | ADM2483BRWZ | ISO3082DW |
|---|---|---|---|---|
| Package | SOIC-16 | SOIC-16 | SOIC-16 | SOIC-16 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 2500 Vrms | 4000 Vrms |
| Data Rate | 16 Mbps | 16 Mbps | 500 kbps | 20 Mbps |
| Duplex | Half/Full | Half/Full | Half | Half |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 50 kV/µs |
| ESD Protection | ±8 kV | ±8 kV | ±8 kV | ±16 kV |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- Higher isolation voltage (5000 Vrms) compared to ADM2483BRWZ (2500 Vrms) (vs ADM2483BRWZ)
- Supports full-duplex operation, unlike ADM2483BRWZ which is half-duplex only (vs ADM2483BRWZ)
- Higher data rate (16 Mbps) compared to ADM2483BRWZ (500 kbps) (vs ADM2483BRWZ)
Design Notes
For optimal isolation performance, maintain a minimum creepage distance of 8 mm between the logic-side and isolated-side copper areas. Use a slot in the PCB under the isolator to increase creepage. Place decoupling capacitors (0.1 µF and 10 µF) close to both VDD1 and VISO pins. Ensure the isolated ground (GND2) is connected to the bus ground at a single point to avoid ground loops.
Keep the RS-485 bus lines (A, B, Y, Z) as short as possible and route them as a differential pair with controlled impedance (typically 120 Ω). Avoid routing these lines near high-speed digital signals or power traces to minimize crosstalk. Place the termination resistor (120 Ω) at the far end of the bus, not at the transceiver.
Do not exceed the absolute maximum ratings for supply voltage (6 V) or isolation voltage (5000 Vrms). Ensure the logic-side supply (VDD1) is within 3.0 V to 5.5 V. For half-duplex operation, remember to connect Y to A and Z to B externally. Failure to do so will result in no communication. Also, ensure the enable pins (RE and DE) are properly driven to avoid bus contention.
Compliance Information
RoHS compliant and lead-free per DigiKey and datasheet. Other compliance information not specified in the provided data.
