ADUM1421ARWZ - Quad-Channel Digital Isolator | Analog Devices
MPN: ADUM1421ARWZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
ADUM1421ARWZ Overview
A digital isolator is a component that transfers digital signals across an isolation barrier without a direct electrical connection, using capacitive, inductive, or optical coupling. The ADUM1421ARWZ uses Analog Devices' iCoupler technology, which employs monolithic air core transformers to couple signals, offering advantages over optocouplers such as higher data rates, lower power consumption, and better reliability. Digital isolators are essential in systems where galvanic isolation is required for safety, noise immunity, or ground potential differences, such as in industrial automation, medical equipment, and communication interfaces.
Key features of the ADUM1421ARWZ include its 2/2 channel configuration (two channels forward, two reverse), 1 Mbps data rate, and 25 kV/µs CMTI. The device supports a wide supply range of 2.7 V to 5.5 V on both VDD1 and VDD2, allowing use in low-voltage systems and enabling level shifting. The isolation barrier provides 2500 Vrms isolation, suitable for many industrial and medical applications. The SOIC-16 package is widely used and easy to integrate into PCB designs.
Technically, the ADUM1421ARWZ uses iCoupler technology, which combines high-speed CMOS and monolithic air core transformers. This architecture avoids the LED and photodiode aging issues of optocouplers, providing more stable performance over time and temperature. The device has a propagation delay of approximately 100 ns and a pulse width distortion of 40 ns, ensuring accurate signal transmission. The CMTI of 25 kV/µs ensures reliable operation in noisy environments, preventing false triggering due to fast voltage transients across the isolation barrier.
Typical applications include industrial field bus isolation, motor control, power supply isolation, and isolated SPI or UART interfaces. The ADUM1421ARWZ is also suitable for medical equipment requiring patient isolation, and for communication interfaces where ground loops must be avoided. Its low power consumption and small package make it ideal for space-constrained designs.
When designing with the ADUM1421ARWZ, ensure proper decoupling capacitors (0.1 µF) are placed close to each VDD pin. The supply voltage on each side must be within the specified range, and the output load capacitance should be limited to avoid excessive propagation delay. For high-voltage isolation, maintain adequate creepage and clearance distances on the PCB.
Drop-in alternatives for ADUM1421ARWZ — 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 ADUM1421ARWZ (same form factor and footprint) — differing in Isolation Voltage, Channel Configuration, Operating Temperature, Technology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM1421BRWZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM1421CRWZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM1401ARWZ
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ADUM1411ARWZ
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →ISO7742DW
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
Si8642BB-B-IS1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM1421ARWZ Specifications
| Number of Channels | 4 |
| Channel Configuration | 2/2 (2 forward, 2 reverse) |
| Data Rate | 1 Mbps |
| Isolation Voltage | 2500 Vrms |
| CMTI | 25 kV/µs |
| Supply Voltage (VDD1/VDD2) | 2.7 V to 5.5 V |
| Propagation Delay | 100 ns (typical) |
| Pulse Width Distortion | 40 ns (typical) |
| Package | 16-SOIC (0.295", 7.50mm Width) |
| Operating Temperature | -40°C to +125°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Technology | iCoupler |
| Number of Channels Forward | 2 |
| Number of Channels Reverse | 2 |
ADUM1421ARWZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 |
| Pin 2 | GND1 — Ground for side 1 |
| Pin 3 | VIA — Input channel A (forward) |
| Pin 4 | VIB — Input channel B (forward) |
| Pin 5 | VOC — Output channel C (reverse) |
| Pin 6 | VOD — Output channel D (reverse) |
| Pin 7 | GND1 — Ground for side 1 |
| Pin 8 | NC — No connect |
| Pin 9 | NC — No connect |
| Pin 10 | GND2 — Ground for side 2 |
| Pin 11 | VIC — Input channel C (reverse) |
| Pin 12 | VID — Input channel D (reverse) |
| Pin 13 | VOA — Output channel A (forward) |
| Pin 14 | VOB — Output channel B (forward) |
| Pin 15 | GND2 — Ground for side 2 |
| Pin 16 | VDD2 — Supply voltage for side 2 |
Typical Applications
ADUM1421ARWZ is suitable for 6 applications: Industrial Fieldbus Isolation, Motor Drive Isolation, Medical Equipment Isolation, Isolated SPI/UART Interface, Power Supply Isolation, Communication Interface Isolation.
Industrial Fieldbus Isolation
The ADUM1421ARWZ provides galvanic isolation for industrial fieldbus interfaces such as RS-485, CAN, and Profibus. Its 2/2 channel configuration supports bidirectional data lines, and the 25 kV/µs CMTI ensures reliable operation in noisy factory environments. The 1 Mbps data rate is sufficient for many fieldbus protocols, and the wide supply range allows interfacing with 3.3 V or 5 V logic. The SOIC-16 package is compact for space-constrained PLC modules.
Recommended
Motor Drive Isolation
In motor drives, the ADUM1421ARWZ isolates control signals from the high-voltage power stage. Its high CMTI of 25 kV/µs prevents false triggering due to fast switching transients from IGBTs or MOSFETs. The 2/2 channel configuration can carry PWM signals (forward) and feedback signals (reverse). The 1 Mbps data rate is adequate for PWM frequencies up to 100 kHz. The wide supply range allows direct interface with the microcontroller and gate driver supplies.
Recommended
Medical Equipment Isolation
The ADUM1421ARWZ provides patient isolation in medical devices such as ECG monitors and infusion pumps. Its 2500 Vrms isolation rating meets basic isolation requirements for many medical standards. The low power consumption and small package make it suitable for portable devices. The 2/2 channel configuration can isolate bidirectional data lines, and the wide supply range supports battery-powered operation. The device's reliability over time, unlike optocouplers, is critical for medical safety.
Recommended
Isolated SPI/UART Interface
The ADUM1421ARWZ is ideal for isolating SPI or UART interfaces between microcontrollers and peripherals. Its 2/2 channel configuration can carry MOSI, MISO, and SCLK signals, with one spare channel for chip select or other control signals. The 1 Mbps data rate supports standard SPI speeds up to 1 MHz. The wide supply range allows level shifting between 3.3 V and 5 V domains. The SOIC-16 package is easy to route on PCBs.
Recommended
Power Supply Isolation
In power supplies, the ADUM1421ARWZ isolates feedback and control signals between the primary and secondary sides. Its high CMTI ensures stable operation under fast voltage transients. The 2/2 channel configuration can carry PWM control signals and feedback signals. The 1 Mbps data rate is sufficient for most power supply control loops. The wide supply range allows operation from auxiliary supplies on both sides.
Recommended
Communication Interface Isolation
The ADUM1421ARWZ isolates communication interfaces such as I2C, SPI, or UART in networking equipment. Its 2/2 channel configuration supports bidirectional data lines, and the 25 kV/µs CMTI ensures reliable operation in environments with electrical noise. The 1 Mbps data rate is suitable for many communication protocols. The wide supply range allows interfacing with different logic levels, and the small package is ideal for high-density boards.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1421ARWZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM1421BRWZ | ADUM1421CRWZ | ADUM1401ARWZ | ISO7742DW | Si8642BB-B-IS1 |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Silicon Labs |
| Data Rate | 1 Mbps | 10 Mbps | 90 Mbps | 10 Mbps | 100 Mbps | 150 Mbps |
| Channel Configuration | 2/2 | 2/2 | 2/2 | 3/1 | 2/2 | 2/2 |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms | 2500 Vrms |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 100 kV/µs | 35 kV/µs |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.25 V to 5.5 V | 2.5 V to 5.5 V |
| Propagation Delay | 100 ns (typical) | 50 ns (typical) | 32 ns (typical) | 50 ns (typical) | 10.7 ns (typical) | 13 ns (typical) |
Key Differentiators
- iCoupler technology provides better reliability than optocouplers (vs Optocoupler-based isolators)
- 2/2 channel configuration is ideal for bidirectional interfaces (vs ADUM1401ARWZ (3/1))
- Wide supply range (2.7 V to 5.5 V) enables voltage translation (vs Si8642BB-B-IS1 (2.5 V to 5.5 V))
Design Notes
Place 0.1 µF decoupling capacitors close to each VDD pin (VDD1 and VDD2) to ensure stable operation. Use low-ESR ceramic capacitors. For high-voltage isolation, maintain adequate creepage and clearance distances between the two sides of the isolation barrier on the PCB, typically at least 8 mm for 2500 Vrms.
Keep the isolation barrier clear of copper traces and components to avoid reducing the isolation rating. Route signals on each side of the barrier separately, and avoid crossing the barrier with other traces. Use a solid ground plane on each side, but do not connect the grounds together except through the isolation barrier.
Do not exceed the absolute maximum supply voltage of 7 V on VDD1 or VDD2. Ensure the input signals do not exceed the supply voltage on the respective side. Also, avoid floating unused inputs; tie them to GND or VDD as appropriate. For bidirectional communication, verify the channel directions match your signal flow.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; for automotive, consider ADUM1421ARWZ-RL7 or other automotive-grade variants.