ADM2490EBRWZ - Isolated RS-485 Transceiver | Analog Devices
MPN: ADM2490EBRWZ ✓ 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 |
ADM2490EBRWZ Overview
An isolated RS-485 transceiver is a component that combines a differential bus transceiver with galvanic isolation, allowing data communication between systems with different ground potentials while preventing ground loops and protecting against common-mode voltage differences. It is a key building block in industrial automation, building control, and instrumentation networks, where robust and reliable data transmission over long distances is required. The isolation barrier is typically implemented using capacitive or magnetic coupling, as in Analog Devices' iCoupler technology.
Key features of the ADM2490EBRWZ include a 16 Mbps data rate, 25 kV/µs common-mode transient immunity (CMTI), and a wide supply voltage range of 3.0 V to 5.5 V on the logic side and 5 V on the bus side. The device also features thermal shutdown protection and a three-state output for bus sharing. The iCoupler technology ensures low power consumption and high reliability compared to optocoupler-based solutions.
The ADM2490E uses iCoupler technology, which employs chip-scale transformers to transmit data across the isolation barrier, offering superior performance in terms of speed, power efficiency, and reliability compared to traditional optocouplers. The device is designed for full-duplex communication, with separate differential driver and receiver pairs, and includes a driver enable pin for half-duplex operation. The wide operating temperature range of -40°C to +105°C makes it suitable for harsh industrial environments.
Typical applications include industrial fieldbus networks, PROFIBUS, Modbus, building automation, and motor control systems. The high CMTI and ESD protection ensure reliable operation in noisy environments. The ADM2490EBRWZ is available in a 16-lead SOIC package (0.295" width, 7.50 mm) and is RoHS compliant.
When designing with this device, ensure proper decoupling on both sides of the isolation barrier and consider the common-mode voltage range to avoid exceeding the device's specifications. The bus side should be terminated according to the transmission line impedance to minimize reflections.
Drop-in alternatives for ADM2490EBRWZ — 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 ADM2490EBRWZ (same form factor and footprint) — differing in Number of Channels, Supply Voltage (Logic Side), Isolation Voltage, Package, Data Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM2490EBRWZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2483BRWZ
✅ Drop-In✓ In Stock
$3.8182 / Unit
View Datasheet →ISO3082DW
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISO3088DW
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADM2491EBRWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.55 / Unit
View Datasheet →ADM2490EBRWZ Specifications
| Type | Isolated RS-485/RS-422 Transceiver |
| Number of Channels | 2 |
| Data Rate | 16 Mbps |
| Isolation Voltage | 5000 Vrms |
| CMTI | 25 kV/µs |
| ESD Protection | ±8 kV (IEC 61000-4-2) |
| Supply Voltage (Logic Side) | 3.0 V to 5.5 V |
| Supply Voltage (Bus Side) | 5 V |
| Duplex | Full-Duplex |
| Number of Drivers/Receivers | 1/1 |
| Package | 16-SOIC (0.295", 7.50mm Width) |
| Operating Temperature | -40°C to +105°C |
| Standards | ANSI TIA/EIA-485-A-1998, ISO 8482: 1987 (E) |
| RoHS | Compliant |
| Mounting Type | Surface Mount |
ADM2490EBRWZ 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 | DE — Driver enable (active high) |
| Pin 5 | RE — Receiver enable (active low) |
| Pin 6 | RO — Receiver output |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
| Pin 9 | VDD2 — Bus side supply voltage (5V) |
| Pin 10 | GND2 — Bus side ground |
| Pin 11 | A — Non-inverting bus line |
| Pin 12 | B — Inverting bus line |
| Pin 13 | Y — Driver output (non-inverting) |
| Pin 14 | Z — Driver output (inverting) |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Typical Applications
ADM2490EBRWZ is suitable for 6 applications: Industrial Fieldbus Networks, Building Automation, Motor Control Systems, Instrumentation and Data Acquisition, Transportation and Rail, Smart Grid and Energy Management.
Industrial Fieldbus Networks
The ADM2490EBRWZ is ideal for industrial fieldbus networks such as PROFIBUS and Modbus, where high-speed, isolated RS-485 communication is required. Its 16 Mbps data rate and 5000 Vrms isolation ensure reliable data transfer over long distances in noisy factory environments. The high CMTI of 25 kV/µs prevents data corruption from common-mode transients caused by motor drives and other switching equipment. The device's full-duplex capability allows simultaneous transmit and receive, improving network efficiency. Its wide operating temperature range (-40°C to +105°C) suits harsh industrial conditions.
Recommended
Building Automation
In building automation systems, the ADM2490EBRWZ provides isolated RS-485 communication between HVAC controllers, lighting systems, and security panels. Its 5000 Vrms isolation protects against ground potential differences between floors and buildings. The 16 Mbps data rate supports fast polling of multiple devices, while the ±8 kV ESD protection ensures robustness during installation and maintenance. The device's small 16-SOIC package saves PCB space, and its low power consumption reduces heat in enclosed control panels. The full-duplex operation enables real-time monitoring and control.
Recommended
Motor Control Systems
The ADM2490EBRWZ is used in motor control systems to provide isolated communication between the controller and motor drives. Its high CMTI of 25 kV/µs ensures reliable data transmission despite the high-voltage transients generated by PWM switching. The 5000 Vrms isolation protects the low-voltage control circuitry from the high-voltage motor side. The 16 Mbps data rate allows real-time control commands and feedback. The device's full-duplex capability enables simultaneous command and status monitoring, improving system response. Its wide temperature range ensures operation in motor cabinets with elevated temperatures.
Recommended
Instrumentation and Data Acquisition
In instrumentation and data acquisition systems, the ADM2490EBRWZ provides isolated RS-485 links between sensors, data loggers, and host computers. Its 5000 Vrms isolation prevents ground loops that could introduce noise into sensitive measurements. The 16 Mbps data rate supports high-throughput data streaming from multiple channels. The ±8 kV ESD protection ensures reliability in field environments. The device's full-duplex operation allows simultaneous data acquisition and configuration. Its low power consumption is beneficial for battery-powered or energy-harvesting instruments.
Recommended
Transportation and Rail
The ADM2490EBRWZ is suitable for transportation and rail applications, such as train communication networks and signaling systems. Its 5000 Vrms isolation provides safety isolation between different subsystems. The 16 Mbps data rate supports high-speed data exchange for diagnostics and control. The device's wide operating temperature range (-40°C to +105°C) withstands extreme outdoor conditions. The high CMTI ensures reliable operation in the presence of electromagnetic interference from traction motors. The full-duplex capability enables bidirectional communication for real-time monitoring.
Recommended
Smart Grid and Energy Management
In smart grid and energy management systems, the ADM2490EBRWZ provides isolated RS-485 communication between smart meters, inverters, and central controllers. Its 5000 Vrms isolation ensures safety and prevents ground loops in distributed installations. The 16 Mbps data rate supports fast data collection from multiple meters. The ±8 kV ESD protection is crucial for outdoor installations. The device's full-duplex operation enables simultaneous data reading and firmware updates. Its wide temperature range suits outdoor enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ADM2490EBRWZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM2490EBRWZ-REEL7 | ADM2483BRWZ | ISO3082DW | ISO3088DW | ADM2491EBRWZ |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (same) | 16-SOIC (same) | 16-SOIC (same) | 16-SOIC (same) | 16-SOIC (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Analog Devices |
| Data Rate | 16 Mbps | 16 Mbps | 500 kbps | 20 Mbps | 20 Mbps | 16 Mbps |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms |
| Duplex | Full-Duplex | Full-Duplex | Half-Duplex | Full-Duplex | Full-Duplex | Full-Duplex |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 50 kV/µs | 50 kV/µs | 25 kV/µs |
| ESD Protection | ±8 kV | ±8 kV | ±8 kV | ±16 kV | ±16 kV | ±8 kV |
| Supply Voltage (Logic) | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.15V to 5.5V | 3.15V to 5.5V | 3.0V to 5.5V |
Key Differentiators
- Higher isolation voltage (5000 Vrms) compared to ADM2483BRWZ (2500 Vrms) (vs ADM2483BRWZ)
- Full-duplex operation vs half-duplex in ADM2483BRWZ (vs ADM2483BRWZ)
- Higher data rate (16 Mbps) vs ADM2483BRWZ (500 kbps) (vs ADM2483BRWZ)
Design Notes
Place decoupling capacitors (0.1 µF and 10 µF) close to both VDD1 and VDD2 pins to ensure stable operation. Use a solid ground plane on both sides of the isolation barrier, but do not connect GND1 and GND2 together on the PCB; they are isolated internally. Keep the isolation barrier clear of copper traces to maintain the specified isolation voltage.
Route the differential bus lines (A, B, Y, Z) as a twisted pair or closely coupled traces to minimize EMI. Terminate the bus with appropriate resistors (typically 120 Ω) at both ends to match the characteristic impedance of the cable. Avoid stubs longer than 1 inch to prevent reflections.
Do not exceed the absolute maximum ratings for supply voltage or bus voltage. Ensure the common-mode voltage on the bus side stays within the specified range (-7V to +12V) to avoid damage. When using the driver enable (DE) and receiver enable (RE) pins, ensure proper timing to avoid bus contention.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance data not specified in provided sources.
