ADUM6422ABRNZ3 - 4ch Digital Isolator w/ isoPower DC-DC | ADI
MPN: ADUM6422ABRNZ3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.62 | $762.00 |
| 500 | $7.33 | $3,665.00 |
| 1,000 | $6.85 | $6,850.00 |
ADUM6422ABRNZ3 Overview
A digital isolator is a semiconductor device that transfers data across an galvanic isolation barrier using high-frequency carriers, transformers, or optical coupling while blocking DC and low-frequency potentials. The ADuM6422A belongs to the iCoupler family, which integrates planar micro-transformers on-chip. Integrated isolated power devices combine a digital isolator with an isolated DC-DC converter in one package, simplifying isolated power-supply designs by eliminating discrete transformer windings, optocouplers, and secondary-side LDO stages. The ADUM6422ABRNZ3 uses the same iCoupler isoPower technology, delivering up to 5 kV rms isolation and meeting CISPR 32/EN 55032 Class B EMI limits on a 2-layer PCB with ferrite beads.
Key features of the ADUM6422ABRNZ3 include four isolation channels configured as 2 transmit / 2 receive, support for 3.3 V or 5 V level translation, and an integrated regulated isolated DC-DC converter capable of supplying enough current to power downstream isolators, gate drivers, or sensor signal chains. The DC-DC converter operates from a wide VDD1 supply range and provides a regulated VISO output, eliminating the need for a separate isolated supply.
The device uses Analog Devices' iCoupler chip-scale transformer technology for both data isolation and power transfer, replacing discrete optocouplers and transformer modules. The 75 kV/us minimum CMTI ensures data integrity in high-noise environments such as motor drive, solar inverter, and industrial fieldbus applications. The part is rated for -40C to +125C operation and supports 100 Mbps NRZ signaling across all four channels.
Typical applications include isolated SPI or RS-485 interfaces in industrial PLCs, isolated gate-drive bias supplies for IGBT/MOSFET bridges in motor drives, isolated analog front-end power for medical equipment, isolated power and data for solar inverters, and functional isolation in EV charging modules. The integrated DC-DC converter simplifies PCB layout and reduces BOM count by 30-50% versus discrete solutions.
When designing with the ADUM6422ABRNZ3, follow Analog Devices' decoupling guidance: place VDD1 and VISO bypass capacitors (1 uF minimum) close to their pins, add ferrite beads between VISO and the load when targeting strict EMI margins, and respect the creepage/clearance of the 7.5 mm wide-body BSSOP for end-system safety certifications. The exposed pad (EP) must be soldered to the PCB ground plane for thermal dissipation.
This page synthesizes distributor pricing, drop-in alternatives from the ADuM642xA family and competing isolator families, and practical PCB layout guidance that complements the manufacturer datasheet.
Drop-in alternatives for ADUM6422ABRNZ3 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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ADUM6422ABRNZ3 Maximum Ratings & Electrical Characteristics
| Isolation Voltage | 5000 Vrms |
| Number of Channels | 4 |
| Channel Configuration | 2/2 (2 Tx / 2 Rx) |
| Maximum Data Rate | 100 Mbps |
| Common-Mode Transient Immunity (CMTI) | 75 kV/us minimum |
| Package | 28-BSSOP (0.295", 7.50 mm width) |
| Mounting Type | Surface Mount |
| Integrated Isolated DC-DC Converter | Yes (isoPower) |
| Operating Temperature Range | -40C to +125C |
| RoHS Status | Compliant |
ADUM6422ABRNZ3 Pin Configuration
| Pin 1 | VDD1 — Primary-side supply voltage |
| Pin 2 | GND1 — Primary-side ground (pin 1 side) |
| Pin 3 | VIA — Primary-side data input/output channel A |
| Pin 4 | VIB — Primary-side data input/output channel B |
| Pin 5 | VIC — Primary-side data input/output channel C |
| Pin 6 | VID — Primary-side data input/output channel D |
| Pin 7 | GND1 — Primary-side ground |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | GND1 — Primary-side ground |
| Pin 10 | DIS — DC-DC converter disable |
| Pin 11 | GND1 — Primary-side ground |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | GND1 — Primary-side ground (pin 14 side) |
| Pin 15 | GNDiso — Isolated-side ground (pin 15 side) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | GNDiso — Isolated-side ground |
| Pin 19 | VOD — Isolated-side data input/output channel D |
| Pin 20 | VOC — Isolated-side data input/output channel C |
| Pin 21 | VOB — Isolated-side data input/output channel B |
| Pin 22 | VOA — Isolated-side data input/output channel A |
| Pin 23 | GNDiso — Isolated-side ground |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | GNDiso — Isolated-side ground |
| Pin 26 | VISO — Isolated DC-DC output voltage |
| Pin 27 | GNDiso — Isolated-side ground |
| Pin 28 | GNDiso — Isolated-side ground (pin 28 side) |
Typical Applications
ADUM6422ABRNZ3 is suitable for 8 applications: Isolated SPI Interface for Industrial PLCs, Isolated Gate-Drive Bias for Motor Drives, Solar Inverter Power Conversion, Medical Patient-Monitoring Equipment, EV Charging Module Isolation, Industrial Fieldbus and RS-485 Isolation, Isolated DAC/ADC Reference Power Supply, Battery Management System (BMS) Isolation.
Isolated SPI Interface for Industrial PLCs
The ADUM6422ABRNZ3 is well suited for isolating SPI buses between a microcontroller and remote sensors in industrial PLC and DCS systems. Its 2 Tx / 2 Rx channel count directly maps to SPI signals (MOSI, SCLK transmit, MISO, CS receive) without requiring extra glue logic. The 100 Mbps data rate supports SPI clocks above 25 MHz, while the 5000 Vrms isolation and 7.5 mm creepage meet IEC 61131-2 reinforced isolation requirements for factory-floor analog I/O modules. The integrated isoPower converter eliminates a discrete isolated DC-DC module, reducing PCB area by up to 40% and BOM count by 6-8 components. The 75 kV/us CMTI ensures SPI data integrity even when adjacent relay coils or motor phases switch.
Recommended
Isolated Gate-Drive Bias for Motor Drives
The ADUM6422ABRNZ3 provides both isolated bias and PWM signaling for IGBT or SiC MOSFET gate drivers in three-phase motor-drive inverters. The integrated isoPower DC-DC converter supplies the +15 V/-5 V rails for high-side gate drivers without an external gate-drive transformer. Its 75 kV/us minimum CMTI is critical in motor drives where high-side phases can slew at 5-10 kV/us during hard switching - a lower CMTI would corrupt PWM data and risk shoot-through. Four channels at 100 Mbps comfortably carry 3 PWM signals plus one fault feedback path. The 5000 Vrms isolation meets IEC 61800-5-1 requirements for adjustable-speed drives up to 690 V AC bus voltage when paired with proper PCB creepage design.
Recommended
Solar Inverter Power Conversion
In solar string inverters and micro-inverters, the ADUM6422ABRNZ3 isolates the high-voltage DC bus-side control loops from the low-voltage grid-side monitoring circuits. The 5000 Vrms isolation supports 1500 V DC string inverters when used in conjunction with reinforced PCB spacings. Its integrated isoPower DC-DC converter powers isolated gate drivers and current-sense amplifiers on the high-voltage side, eliminating a bulky discrete flyback converter. The 2 Tx / 2 Rx channel count supports bidirectional data such as PWM gate-drive signals and isolated current-sense feedback from the DC bus. Meeting CISPR 32 Class B on a 2-layer PCB reduces the inverter's overall cost and complexity.
Recommended
Medical Patient-Monitoring Equipment
Patient monitors, infusion pumps, and diagnostic ECG equipment use the ADUM6422ABRNZ3 to provide 5000 Vrms reinforced isolation between patient-applied circuits and the main host electronics. The 7.5 mm wide-body package delivers the creepage and clearance needed to qualify for 2 MOPP per IEC 60601-1 when paired with the recommended PCB layout. The integrated isoPower DC-DC converter simplifies the isolated power architecture, saving PCB area in compact bedside monitors where space is at a premium. Four channels at 100 Mbps support isolated SPI between a host MCU and isolated ADC, plus a fault or alarm signal. The -40C to +125C operating range supports both portable battery-powered units and cart-mounted systems.
Recommended
EV Charging Module Isolation
EV charging stations and on-board chargers (OBCs) use the ADUM6422ABRNZ3 to isolate the high-voltage DC-link side from the low-voltage CAN/control side per IEC 61851 and ISO 15118. The integrated isoPower DC-DC converter powers isolated gate drivers and current-sense amplifiers on the HV side, reducing the BOM by 5-7 components and improving reliability in high-vibration automotive environments. Four channels at 100 Mbps support isolated CAN-FD plus additional PWM control signals between the charger and vehicle ECU. The 75 kV/us CMTI is essential for SiC MOSFET chargers with fast-switching waveforms. The -40C to +125C operating range covers the under-hood automotive thermal envelope.
Recommended
Industrial Fieldbus and RS-485 Isolation
PROFIBUS, Modbus RTU, and RS-485 industrial networks use the ADUM6422ABRNZ3 to provide reinforced isolation between the physical-layer transceiver and the host MCU. The integrated isoPower DC-DC converter powers the isolated RS-485 transceiver on the field side without a separate isolated bias supply, reducing component count. Four channels at 100 Mbps support two full-duplex RS-485 channels or one RS-485 plus one UART debug port. The 5000 Vrms isolation meets IEC 61131-2 industrial control standards and protects against ground potential differences up to 5 kV in factory-floor installations. The -40C to +125C range supports outdoor cabinet deployments.
Recommended
Isolated DAC/ADC Reference Power Supply
Precision data-acquisition systems use the ADUM6422ABRNZ3 to provide isolated, low-noise bias for ADC and DAC reference circuits in multi-channel measurement equipment. The integrated isoPower DC-DC converter supplies a clean isolated 5 V or 3.3 V rail to the secondary-side signal chain, with the device's CISPR 32 Class B compliance ensuring low noise injection into sensitive analog paths. Four channels at 100 Mbps support isolated SPI for ADC configuration and readback plus a synchronization signal. The 5000 Vrms isolation allows safe measurement of 1000 V+ battery stacks or solar arrays. The 7.5 mm wide-body creepage maintains measurement accuracy by minimizing leakage across the isolation barrier.
Recommended
Battery Management System (BMS) Isolation
Battery management systems for high-voltage Li-ion packs (e-mobility, grid storage) use the ADUM6422ABRNZ3 to isolate the cell-monitoring MCU from the main controller. The integrated isoPower DC-DC converter powers the isolated AFE on the high-voltage cell stack side, eliminating a discrete isolated supply that would otherwise need to be qualified for high-altitude, high-humidity operation. Four channels at 100 Mbps support isolated SPI plus one fault/interrupt signal. The 5000 Vrms isolation supports 800 V and 1000 V battery architectures per ISO 6469-3 and IEC 62619. The -40C to +125C operating range covers under-hood automotive and outdoor stationary storage conditions.
Recommended
Recommended Products Summary
Engineering reference data for ADUM6422ABRNZ3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM6422ACRNZ3 | ADUM6421ABRNZ3 | ADUM6420ABRNZ3 | ADUM6423ABRNZ3 | ADUM6424ABRNZ3 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-BSSOP (7.5 mm wide-body) | 28-BSSOP (7.5 mm wide-body) | 28-BSSOP (7.5 mm wide-body) | 28-BSSOP (7.5 mm wide-body) | 28-BSSOP (7.5 mm wide-body) | 28-BSSOP (7.5 mm wide-body) |
| Channel Configuration | 2 Tx / 2 Rx | 2 Tx / 2 Rx | 3 Tx / 1 Rx | 0 Tx / 4 Rx | 1 Tx / 3 Rx | 4 Tx / 0 Rx |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| Maximum Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| CMTI (minimum) | 75 kV/us | 75 kV/us | 75 kV/us | 75 kV/us | 75 kV/us | 75 kV/us |
| Integrated isoPower DC-DC | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| 1ku List Price (USD) | 7.33 | 7.33 | 7.33 | 7.33 | 7.33 | 7.33 |
Key Differentiators
- Only wide-body 28-BSSOP part with both 2/2 channel count and integrated isoPower DC-DC (vs ADUM6421ABRNZ3 (3/1) and ADUM6423ABRNZ3 (1/3))
- Integrated DC-DC converter eliminates transformer design effort (vs Discrete isolator + transformer module (e.g., ADuM141E + custom transformer))
- 75 kV/us CMTI preserves data integrity in high-dV/dt environments (vs ADuM140D digital isolator family (25 kV/us typical))
- No cross-brand drop-in equivalent exists with integrated isoPower (vs Silicon Labs Si88xx or TI ISOW7841)
Design Notes
Place a 1 uF low-ESR ceramic bypass capacitor (X7R, 25 V minimum) on VDD1 (Pin 1) and a 1 uF capacitor on VISO (Pin 26), located within 2 mm of the respective pins. The internal isoPower DC-DC converter requires adequate input and output capacitance to maintain regulation under load steps; insufficient capacitance causes VISO droop and potential data corruption on the isolated channels. A 10 uF bulk capacitor in parallel is recommended for applications with transient loads above 50 mA.
Maintain a clearance of at least 7.5 mm (matching the package creepage) between primary-side and isolated-side copper on all PCB layers, including inner layers. The 28-BSSOP wide-body package provides the necessary internal clearance; the PCB must not reduce this with traces or copper pours routed under the device. Avoid routing any signal or power trace beneath the package body. Both GND1 (primary) and GNDiso (isolated) planes should be solid pours to minimize EMI.
To meet CISPR 32 Class B limits on a 2-layer PCB, install ferrite beads on the VDD1 input and VISO output, as shown in the ADuM642xA datasheet application schematic. Place the ferrite beads in series with the supply lines, immediately adjacent to the bypass capacitors. The device uses spread-spectrum modulation for the DC-DC converter, which significantly reduces peak EMI compared to fixed-frequency converters, but ferrite beads are still required for compliance in industrial systems.
Do not connect primary ground (GND1) and isolated ground (GNDiso) anywhere on the PCB - this defeats the galvanic isolation and creates a safety hazard. The exposed pad (EP) on the bottom of the package is internally connected to GNDiso; solder it to the isolated ground plane for thermal dissipation. Excessive load current on VISO (above the datasheet rating) will trigger the internal current limit, causing VISO to droop and potentially latch the converter off; respect the maximum VISO load current specification.
Estimated: at full 5 kV isolation and maximum data rate (100 Mbps all four channels), the ADUM6422ABRNZ3 dissipates approximately 0.5-0.8 W. The 28-BSSOP package has a typical theta_JA of 50-60 C/W on a 2-layer JEDEC test board, giving a junction temperature rise of 25-48 C above ambient. For applications near the 125 C maximum junction temperature, ensure adequate PCB copper area (at least 100 mm^2) on GNDiso to act as a thermal spreader.
Compliance Information
RoHS and REACH compliant per Analog Devices product page; the ADUM6422ABRNZ3 is NOT AEC-Q100 qualified - for automotive-grade applications requiring AEC-Q100, select the ADuM6422AWBRNZ3 automotive variant or contact Analog Devices. The 7.5 mm wide-body package provides the creepage/clearance needed for reinforced insulation at 5000 Vrms per IEC 60747-17 and UL 1577.
