ADUM1421ARWZ-RL7 - 4-Ch Digital Isolator 3750Vrms | Analog Devices
MPN: ADUM1421ARWZ-RL7 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for ADUM1421ARWZ-RL7 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesADUM1421ARWZ-RL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Isolation Voltage | 3750 Vrms |
| Data Rate | 2 Mbps |
| Common-Mode Transient Immunity | 25 kV/us |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Propagation Delay | 100 ns (typical) |
| Pulse Width Distortion | 10 ns (typical) |
| Channel Directionality | 3 forward, 1 reverse |
| Operating Temperature Range | -40C to +125C |
| Package Type | 20-Lead SOIC-W |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Technology | iCoupler |
| Power Consumption | 1.8 mA per channel (typical) |
ADUM1421ARWZ-RL7 Pin Configuration
| Pin 1 | VDD1 β Supply voltage for side 1 |
| Pin 2 | GND1 β Ground for side 1 |
| Pin 3 | VIA β Input channel A |
| Pin 4 | VIB β Input channel B |
| Pin 5 | VIC β Input channel C |
| Pin 6 | VOD β Output channel D |
| Pin 7 | GND1 β Ground for side 1 |
| Pin 8 | NC β No connect |
| Pin 9 | NC β No connect |
| Pin 10 | NC β No connect |
| Pin 11 | NC β No connect |
| Pin 12 | NC β No connect |
| Pin 13 | GND2 β Ground for side 2 |
| Pin 14 | VOD β Output channel D |
| Pin 15 | VIC β Input channel C |
| Pin 16 | VIB β Input channel B |
| Pin 17 | VIA β Input channel A |
| Pin 18 | GND2 β Ground for side 2 |
| Pin 19 | VDD2 β Supply voltage for side 2 |
| Pin 20 | NC β No connect |
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
ADUM1421ARWZ-RL7 is suitable for 6 applications: Industrial Fieldbus Communication, Isolated SPI Interface, Motor Control, Medical Equipment, Power Supply Monitoring, Communication Systems.
Industrial Fieldbus Communication
The ADUM1421ARWZ-RL7 provides galvanic isolation for industrial fieldbus interfaces such as RS-485 and CAN. Its 3750Vrms isolation and 25kV/us CMTI ensure reliable communication in harsh industrial environments with high voltage transients and ground potential differences. The 2Mbps data rate is sufficient for most fieldbus protocols, and the low power consumption makes it suitable for remote I/O modules. The 3/1 channel configuration allows isolation of data and control signals, improving system robustness.
Recommended
Isolated SPI Interface
The ADUM1421ARWZ-RL7 is ideal for isolating SPI buses between microcontrollers and peripheral devices such as ADCs, DACs, and sensors. With 3 forward channels for MOSI, SCLK, and CS, and 1 reverse channel for MISO, it provides complete SPI isolation. The 2Mbps data rate supports standard SPI speeds, and the low propagation delay ensures accurate timing. This application is common in industrial control systems and medical devices where isolation is required for safety and noise immunity.
Recommended
Motor Control
In motor control systems, the ADUM1421ARWZ-RL7 isolates the control signals from the power stage, protecting the microcontroller from high voltage transients and noise. The high CMTI of 25kV/us ensures reliable operation in the presence of fast switching transients. The 4-channel configuration can isolate PWM signals, fault signals, and communication lines. The wide operating temperature range of -40C to +125C makes it suitable for industrial motor drives.
Recommended
Medical Equipment
The ADUM1421ARWZ-RL7 provides galvanic isolation in medical devices to ensure patient safety and prevent electrical shock. Its 3750Vrms isolation rating meets safety standards for medical equipment. The low power consumption is beneficial for portable devices, and the high CMTI ensures reliable operation in the presence of interference from electrosurgical equipment. Typical applications include patient monitoring, diagnostic devices, and isolated data acquisition systems.
Recommended
Power Supply Monitoring
The ADUM1421ARWZ-RL7 is used to isolate monitoring signals in power supply systems, allowing safe measurement of voltages and currents on high-voltage rails. The 4-channel configuration can isolate multiple analog or digital signals, such as voltage sense, current sense, and fault indicators. The high isolation voltage and CMTI ensure accurate monitoring in noisy power environments. The device's low power consumption is advantageous for always-on monitoring circuits.
Recommended
Communication Systems
The ADUM1421ARWZ-RL7 provides isolation in communication systems to prevent ground loops and protect sensitive components. It is used in isolated UART, SPI, and I2C interfaces in networking equipment, base stations, and telecommunication systems. The 2Mbps data rate supports standard communication protocols, and the high CMTI ensures reliable data transmission in the presence of electromagnetic interference. The compact SOIC-W package is suitable for space-constrained designs.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1421ARWZ-RL7 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM1441ARSZ-RL7 | ADUM1401ARWZ | ADUM1411ARWZ | ISO7741DW | Si8641BB-B-IS1 |
|---|---|---|---|---|---|---|
| Package | 20-Lead SOIC-W | 20-Lead SSOP | 16-Lead SOIC-W | 16-Lead SOIC-W | 16-Lead SOIC | 16-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Silicon Labs |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms | 2500 Vrms |
| Data Rate | 2 Mbps | 150 Mbps | 90 Mbps | 10 Mbps | 100 Mbps | 150 Mbps |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| CMTI | 25 kV/us | 25 kV/us | 25 kV/us | 25 kV/us | 100 kV/us | 35 kV/us |
| Supply Voltage Range | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 2.25V to 5.5V | 2.5V to 5.5V |
| Propagation Delay | 100 ns | 13 ns | 50 ns | 100 ns | 10 ns | 10 ns |
Key Differentiators
- Higher isolation voltage than ADUM1401ARWZ (vs ADUM1401ARWZ)
- Lower power consumption than ISO7741DW (vs ISO7741DW)
- Wider operating temperature range than Si8641BB-B-IS1 (vs Si8641BB-B-IS1)
Design Notes
Ensure proper PCB layout with adequate creepage and clearance distances to maintain the 3750Vrms isolation rating. The SOIC-W package has a minimum creepage of 8mm, so maintain at least this distance between the high-voltage and low-voltage sides. Use a solid ground plane on each side and avoid routing traces across the isolation barrier.
Bypass the VDD1 and VDD2 pins with 0.1uF ceramic capacitors placed as close as possible to the pins. Additionally, use a 10uF bulk capacitor on each supply rail to handle transient currents. The device consumes approximately 1.8mA per channel, so ensure the power supply can provide sufficient current without significant voltage drop.
Do not exceed the absolute maximum supply voltage of 7V on VDD1 or VDD2. Also, ensure that the input signals do not exceed the supply voltage range. When using the device for SPI isolation, verify that the data rate and timing meet the requirements of the SPI slave device. Incorrect channel directionality can cause communication failures.
Compliance Information
RoHS compliant per Analog Devices product page. Lead-free. Not AEC-Q100 qualified.
