ADUM121N0WBRZ-RL7 - 150Mbps Dual Digital Isolator, 3kV | Analog Devices
MPN: ADUM121N0WBRZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.89 | $28.90 |
| 100 | $2.55 | $255.00 |
| 500 | $2.28 | $1,140.00 |
| 1,000 | $2.05 | $2,050.00 |
| 3,000 | $1.82 | $5,460.00 |
ADUM121N0WBRZ-RL7 Overview
A digital isolator is a semiconductor device that transfers digital signals between two circuit domains while providing galvanic isolation - a safety barrier that blocks DC and low-frequency fault currents while allowing high-speed data to pass through transformer, capacitive, or optical coupling. iCoupler technology integrates a chip-scale air-core transformer on a CMOS die, replacing the LED/photodiode stack used in optocouplers. Compared with optocouplers, iCoupler parts like the ADuM121N offer 10x to 100x faster data rates, tighter pulse-width distortion, lower power, and no LED-degradation aging effects. Digital isolators sit in the signal-conditioning block between sensors/MCUs and the rest of the system.
Key features of the ADuM121N0WBRZ-RL7 include 25 ns typical propagation delay, 2 ns typical pulse-width distortion, 4 mA per-channel supply current at 3.3 V, and 100 kV/us minimum CMTI. The wide-body SOIC package provides the 3 kVrms reinforced isolation needed for industrial and renewable-energy applications while exposing the part to standard 8-pin SMD assembly. The -RL7 suffix denotes a 7-inch tape-and-reel packaging for high-volume production.
From an architectural standpoint, the ADuM121N uses a differential transformer coupling path with on-chip encoding that refreshes the input state on every clock cycle, eliminating the run-length limitations of competing edge-based architectures. The wide supply range (1.7 V to 5.5 V) allows direct connection to 1.8 V, 2.5 V, 3.3 V, or 5 V logic without level shifters, simplifying mixed-voltage isolation. The 150 Mbps data rate supports SPI, I2C (via bit-banging), RS-485, and high-speed GPIO up to about 10 MHz NRZ.
Typical applications include isolated SPI interfaces for motor drives, isolated gate-drive signal paths in solar inverters, RS-485/RS-232 isolation in industrial PLCs, isolated ADC front-ends for medical and test equipment, and digital control links in EV battery management systems. Designers favor this part when 3 kVrms isolation, high CMTI, and 150 Mbps throughput must coexist in a wide-body SOIC footprint.
When designing with the ADuM121N0WBRZ-RL7, place decoupling capacitors (typically 0.1 uF) on both VDD1 and VDD2 within 2 mm of the supply pins, and route the input/output traces on opposite sides of the isolation barrier to maintain creepage. Confirm that PCB layout preserves the 4 mm minimum clearance required by the 8-SOIC wide-body package for 3 kVrms reinforced isolation.
Drop-in alternatives for ADUM121N0WBRZ-RL7 — 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 ADUM121N0WBRZ-RL7 (same form factor and footprint) — differing in Common-Mode Transient Immunity (CMTI), Package, Propagation Delay, RoHS Status, Technology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM121N1BRZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM121N0BRZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM120N1BRZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM120N0BRZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7721DWR
✅ Drop-In📋 Reference alternative (not in catalog)
SI8422BB-D-IS
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →ADUM121N0WBRZ-RL7 Specifications
| Isolation Voltage | 3000 Vrms |
| Number of Channels | 2 |
| Channel Configuration | 1/1 (one forward, one reverse) |
| Data Rate | 150 Mbps |
| Common-Mode Transient Immunity (CMTI) | 100 kV/us minimum |
| Propagation Delay | 25 ns typical |
| Pulse-Width Distortion | 2 ns typical |
| Supply Voltage Range (both sides) | 1.7 V to 5.5 V |
| Supply Current per Channel | 4 mA typical at 3.3 V |
| Operating Temperature Range | -40C to +125C |
| Package | 8-SOIC (NSOIC) wide-body, 0.154" (3.90 mm) width |
| Mounting Type | Surface Mount |
| Technology | iCoupler (CMOS + monolithic air-core transformer) |
| RoHS Status | Compliant |
ADUM121N0WBRZ-RL7 Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 (input side), 1.7 V to 5.5 V |
| Pin 2 | VIA — Logic input A (side 1) |
| Pin 3 | VIB — Logic input B (side 1) |
| Pin 4 | GND1 — Ground reference for side 1 (isolation barrier at pin 4/5) |
| Pin 5 | GND2 — Ground reference for side 2 (isolation barrier at pin 4/5) |
| Pin 6 | VOB — Logic output B (side 2) |
| Pin 7 | VOA — Logic output A (side 2) |
| Pin 8 | VDD2 — Supply voltage for side 2 (output side), 1.7 V to 5.5 V |
Typical Applications
ADUM121N0WBRZ-RL7 is suitable for 6 applications: Isolated SPI Interface for Motor Drives, Isolated Gate Drive Signal Path in Solar Inverters, Industrial PLC Isolated I/O and RS-485 Links, Isolated ADC Front-End for Medical and Test Equipment, EV Battery Management System (BMS) Isolation, Isolated Digital Control for Renewable Energy Microinverters.
Isolated SPI Interface for Motor Drives
The ADUM121N0WBRZ-RL7's 150 Mbps data rate and 100 kV/us CMTI make it ideal for isolating high-speed SPI links between a microcontroller and a gate-driver or feedback ASIC in industrial motor drives. The 1/1 channel configuration supports full-duplex SPI (MOSI/MISO) through a single isolator, and the 3 kVrms reinforced isolation meets IEC 61800-5-1 requirements for adjustable-speed drives. Designers typically place the part between the control MCU and the low-side gate driver, with 0.1 uF bypass capacitors on each VDD pin within 2 mm.
Recommended
Isolated Gate Drive Signal Path in Solar Inverters
Photovoltaic inverters require galvanic isolation between the DC-side control board and the AC-side IGBT/MOSFET gate drivers for safety and level translation. The ADUM121N0WBRZ-RL7 delivers 3 kVrms isolation and 100 kV/us CMTI to withstand the high dV/dt switching transients of IGBT bridges at 20 kHz+. The 25 ns propagation delay keeps PWM timing accuracy within budget for grid-tie inverter control loops. The wide-body 8-SOIC package is widely accepted in solar inverter reference designs.
Recommended
Industrial PLC Isolated I/O and RS-485 Links
Programmable logic controllers isolate fieldbus connections, digital I/O, and serial communication ports to protect the backplane from field-side faults. The ADUM121N0WBRZ-RL7 supports isolated half-duplex RS-485 at up to 150 Mbps, well beyond PROFIBUS, Modbus, and EtherCAT physical-layer requirements. The 1.7 V to 5.5 V supply range lets the part run directly from 3.3 V backplane logic without level shifters. Its 8-SOIC wide-body footprint matches the standard PLC isolation-channel allocation.
Recommended
Isolated ADC Front-End for Medical and Test Equipment
Patient-connected medical devices and precision test instruments require analog and digital isolation to protect operators and downstream circuitry. The ADUM121N0WBRZ-RL7 isolates the digital control signals (SPI clock, sync, data-ready) between a precision ADC and an FPGA, providing 3 kVrms patient protection per IEC 60601-1. The 150 Mbps data rate supports simultaneous-sampling ADC sample rates up to 10 MSPS, and the 2 ns pulse-width distortion preserves sample-to-sample timing integrity for accurate FFT analysis.
Recommended
EV Battery Management System (BMS) Isolation
Electric-vehicle battery management systems isolate high-voltage stack monitoring from the 12 V vehicle bus for safety. The ADUM121N0WBRZ-RL7 provides 3 kVrms isolation between the cell-monitoring ASIC and the MCU, transmitting SPI commands and response data at speeds up to 150 Mbps for daisy-chained BMS topologies. The wide-body SOIC package is qualified for the under-hood thermal environment (-40C to +125C) and supports the AEC-Q100 grade-1 flow used by automotive tier-1 suppliers. The 1/1 channel direction matches half-duplex BMS communication patterns.
Recommended
Isolated Digital Control for Renewable Energy Microinverters
Microinverters and string inverters in residential and commercial solar installations use digital isolators to break ground loops between the high-voltage DC input and the AC-grid-tie control section. The ADUM121N0WBRZ-RL7's wide-body 8-SOIC footprint and 3 kVrms rating satisfy UL 1741 and IEC 62109 isolation requirements for grid-tied inverters. The 150 Mbps bandwidth supports rapid PWM feedback and grid-synchronization signal transfer with negligible propagation delay. Industrial designers pair it with isolated gate drivers to achieve full-stack isolation in a compact PCB footprint.
Recommended
Recommended Products Summary
Engineering reference data for ADUM121N0WBRZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM121N1BRZ-RL7 | ADUM121N0BRZ-RL7 | ADUM120N1BRZ-RL7 | ADUM120N0BRZ-RL7 | ISO7721DWR | SI8422BB-D-IS |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Silicon Labs |
| Package | 8-SOIC (NSOIC) wide-body | 8-SOIC wide-body (same) | 8-SOIC narrow-body (different footprint) | 8-SOIC wide-body (same) | 8-SOIC wide-body (same) | 8-SOIC wide-body (same) | 8-SOIC wide-body (same) |
| Isolation Voltage | 3000 Vrms | 3000 Vrms | 570 Vrms (narrow-body) | 3000 Vrms | 3000 Vrms | 3000 Vrms | 2500 Vrms |
| Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 100 Mbps | 150 Mbps |
| Channel Configuration | 1/1 | 1/1 | 1/1 | 2/0 | 2/0 | 2/1 | 1/1 |
| CMTI (Minimum) | 100 kV/us | 100 kV/us | 100 kV/us | 100 kV/us | 100 kV/us | 100 kV/us | 50 kV/us |
| Propagation Delay (typ) | 25 ns | 25 ns | 25 ns | 25 ns | 25 ns | 18 ns | 30 ns |
| Supply Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 2.25 V to 5.5 V | 2.5 V to 5.5 V |
| Default Output Polarity | Low (0) | High (1) | Low (0) | High (1) | Low (0) | High (1) | High (1) |
Key Differentiators
- Highest data rate in 8-SOIC wide-body dual-channel digital isolator class (vs ISO7721DWR)
- 1/1 channel configuration in same package as 2/0 ADuM120N (vs ADUM120N1BRZ-RL7)
- Reinforced 3000 Vrms isolation in narrow-body option (vs ADUM121N0BRZ-RL7)
Design Notes
Place 0.1 uF bypass capacitors on both VDD1 (pin 1) and VDD2 (pin 8) within 2 mm of the device to keep the high-speed digital isolator switching currents from inducing voltage drops on the supply traces. Route input-side and output-side traces on opposite PCB layers with a clear keep-out zone across the isolation barrier. The 8-SOIC wide-body package requires at least 4 mm of creepage distance across the top surface between pins 4 (GND1) and pin 5 (GND2) to maintain the 3000 Vrms rating per IEC 60747-17.
Do not connect decoupling capacitors across the isolation barrier (from VDD1 to GND2), as this defeats the isolation rating and creates a safety hazard. Also avoid routing high-speed signals (greater than 50 Mbps) near the barrier without a ground guard trace, since capacitive coupling across the barrier can introduce data corruption. For CMTI-sensitive applications, ensure both VDD1 and VDD2 are decoupled with bulk capacitance (1 uF to 10 uF) in addition to the 0.1 uF high-frequency cap.
The 8-SOIC wide-body package has a thermal resistance (theta_JA) of approximately 110 C/W on a standard 2-layer JEDEC test board. At the maximum 4 mA per-channel supply current and 5.5 V VDD, the device dissipates roughly 44 mW per channel, well below thermal limits. In high-density layouts with multiple isolators in close proximity, ensure each part has adequate copper pour for heat spreading; the part's thermal performance is not a bottleneck at typical operating loads.
At 150 Mbps data rates, treat VIA, VIB, VOA, and VOB traces as 50 ohm transmission lines and series-terminate at the source end with a 33 ohm to 50 ohm resistor for cable lengths greater than 50 mm or when routing to a remote connector. Keep input and output traces short and matched to minimize propagation-delay mismatch; per the ADuM121N datasheet, channel-to-channel matching is 2 ns typical. Adding a small RC snubber (10 ohm + 33 pF) at the receiver can suppress ringing on long traces.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified - this part targets industrial and renewable-energy applications; automotive-grade variants are available in the ADuM121N family as separate suffix options. Lead-free reflow profile per JEDEC J-STD-020.
