My Inquiry
My Account
Analog Devices Inc. ADUM1281WBRZ
- Part No.:
- ADUM1281WBRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1281WBRZ.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADUM1281WBRZ from Analog Devices is a 3 kVRMS dual-channel digital isolator based on iCoupler® transformer technology, providing bidirectional signal isolation with default-high output logic state. It supports up to 100 Mbps NRZ data rate, exhibits 23 ns typical propagation delay, and operates across 3.135 V to 5.5 V supply rails on both sides - enabling 3.3 V/5 V level translation. It is used in motor drive control interfaces where high common-mode transient immunity (>25 kV/µs) and AEC-Q100 qualification are required.
For engineers reviewing the ADUM1281WBRZ datasheet, ADUM1281WBRZ pinout, ADUM1281WBRZ application, or ADUM1281WBRZ equivalent, this page delivers verified specifications, functional pin mapping, automotive-grade safety certifications (UL 1577, VDE 0884-17, IEC 62368-1), and real-world use context for industrial and automotive isolation design.
Technical Context
The ADUM1281WBRZ implements two independent galvanic isolation channels using monolithic air-core transformers, eliminating LED aging and timing drift inherent in optocouplers. Its patented refresh circuit ensures DC-correct output behavior even during static input conditions or power-up sequencing.
It features reinforced insulation rated at 3000 VRMS for 1 minute and 565 VPEAK working voltage, with thermal derating support up to +125°C ambient. Channel-to-channel matching is ≤5 ns (codirectional), and pulse width distortion remains ≤2 ns at 100 Mbps - critical for high-fidelity serial bus timing in CAN FD or SPI-isolated systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 100 Mbps NRZ - supports high-speed SPI, RS-485, and digital encoder interfaces without oversampling. |
| Propagation Delay | 23 ns typical - enables tight timing budgets in closed-loop motor control and real-time feedback paths. |
| Common-Mode Transient Immunity | >25 kV/µs - maintains signal integrity in noisy inverter gate-drive environments with fast dV/dt switching. |
| Isolation Rating | 3000 VRMS for 1 min, VIORM = 565 VPEAK - meets reinforced insulation requirements per DIN EN IEC 60747-17 (VDE 0884-17). |
| Supply Range | 3.135 V to 5.5 V on both sides - allows flexible interfacing between 3.3 V microcontrollers and 5 V field-side peripherals. |
| Default Output State | High - ensures fail-safe logic-high default on isolated outputs during power loss or initialization. |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
Pinout & Package
Narrow-body 8-lead SOIC package (SOIC_N), RoHS-compliant, with creepage and clearance ≥4.0 mm per IEC 62368-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side supply rail | Power source for side 1 logic and transformer driver; accepts 3.135–5.5 V with UVLO thresholds at 2.65 V/2.75 V. |
| 2 - VOA | Output A (isolated side) | Default-high logic output driven by input A; compatible with CMOS loads up to 3.2 mA sink/source. |
| 3 - VIB | Input B (primary side) | Logic-level input referenced to GND1; threshold at 0.3×VDD1 (low) / 0.7×VDD1 (high). |
| 4 - GND1 | Input-side ground reference | Return path for VDD1 and side-1 signals; must be separated from GND2 by ≥4.0 mm PCB spacing. |
| 5 - GND2 | Output-side ground reference | Return path for VDD2 and side-2 signals; electrically isolated from GND1 by reinforced insulation barrier. |
| 6 - VOB | Output B (isolated side) | Default-high logic output driven by input B; matches VOA timing within ≤5 ns channel-to-channel skew. |
| 7 - VIA | Input A (primary side) | Logic-level input referenced to GND1; identical electrical characteristics to VIB. |
| 8 - VDD2 | Output-side supply rail | Power source for side 2 logic and transformer receiver; supports independent 3.135–5.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional isolation channels | Two independent, unidirectional signal paths (A and B) with no shared logic - enables full-duplex SPI or dual-signal feedback. |
| DC-correct refresh architecture | Patented internal refresh cycle (1.6 µs period) guarantees output state retention during static input or power interruptions. |
| Level translation capability | Supports mixed-voltage operation (e.g., 3.3 V MCU ↔ 5 V sensor interface) without external level shifters. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery monitoring and motor control units operating at 125°C ambient. |
| High CMTI robustness | Immunity >25 kV/µs ensures reliable operation in high-dV/dt environments such as IGBT/SiC gate drivers and inverters. |
Applications
| Motor Drive Feedback Isolation | SPI Interface Isolation |
|---|---|
|
Use Scenario: Isolating position encoder signals and current sense feedback from high-voltage inverter stages in EV traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator conveying quadrature encoder A/B signals and analog-to-digital converter status with sub-5 ns channel matching. Use Value: Prevents ground loop noise injection while preserving 100 Mbps timing fidelity required for real-time torque control loops. |
Use Scenario: Isolating SPI clock, MOSI, MISO, and CS lines between an MCU and isolated ADC or DAC in industrial PLC modules. IC Role / Device Role / Timing Role: Provides four isolated signal paths (using two ADUM1281WBRZ devices) with matched propagation delay to maintain SPI timing margins. Use Value: Enables safe, high-speed communication across isolation barriers without violating setup/hold timing at 20+ MHz SPI clocks. |
| Automotive Battery Management System (BMS) | Industrial Fieldbus Isolation |
|
Use Scenario: Isolating cell voltage measurement data and balancing command signals between high-side battery stack monitors and low-side controller in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator handling differential voltage sampling triggers and fault reporting signals with AEC-Q100 validated reliability. Use Value: Meets reinforced insulation requirements (VIORM = 565 VPEAK) and withstands continuous 400 VRMS working voltage per IEC 62368-1. |
Use Scenario: Galvanically isolating RS-485 transceiver control lines and data lines in factory automation networks exposed to ESD and surge events. IC Role / Device Role / Timing Role: Isolates DE/RE control and RX/TX data paths to break ground loops while maintaining 25 Mbps data throughput. Use Value: Delivers >25 kV/µs CMTI and UL/VDE safety approvals required for Class I Division 2 hazardous location deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8621ED-B-IS | 2.5 kVRMS isolation rating; lower CMTI (20 kV/µs); no AEC-Q100 qualification. | Suitable for industrial but not automotive BMS or motor drive applications requiring 3 kVRMS and 125°C operation. | Select when cost sensitivity outweighs automotive qualification and higher CMTI needs. |
| ISO7721DWR | 5000 VRMS isolation; higher propagation delay (32 ns typ); different pinout (VIA/VIB on pins 2/3 vs. 7/3 in ADUM1281WBRZ). | Preferred for medical or high-voltage industrial systems needing greater dielectric strength, but requires PCB layout change. | Choose only if 5 kVRMS rating is mandatory and board redesign is acceptable. |
Compared with SI8621ED-B-IS and ISO7721DWR, ADUM1281WBRZ uniquely balances AEC-Q100 qualification, 3 kVRMS reinforced insulation, 100 Mbps speed, and pin-compatible drop-in replacement for legacy ADuM1201 designs in automotive and industrial motor control.
Availability
ADUM1281WBRZ is available at Aetrix Electronics and suitable for motor drive feedback isolation, SPI interface isolation, and automotive battery management systems requiring stable component supply and long-term lifecycle assurance.
Supply support for ADUM1281WBRZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADuM1281WBRZ belongs to the iCoupler® digital isolator product line, engineered specifically for high-reliability, high-speed galvanic isolation in safety-critical automotive and industrial systems demanding AEC-Q100 compliance and reinforced insulation.
FAQ
What is the default output state of ADUM1281WBRZ?
The ADUM1281WBRZ has a default-high output state on both VOA and VOB pins when input power is absent or during power-up sequencing. This behavior is confirmed in the truth tables (Table 23) and ensures fail-safe operation in motor control and BMS applications where a logic-high default prevents unintended actuation.
Does ADUM1281WBRZ support mixed-voltage operation between 3.3 V and 5 V domains?
Yes, ADUM1281WBRZ supports mixed-voltage operation: VDD1 may be 3.3 V while VDD2 is 5 V (or vice versa), enabling seamless level translation without external components. Electrical characteristics for this configuration are fully specified in Tables 7 and 10 of the Rev. E datasheet.
What safety certifications does ADUM1281WBRZ hold?
ADUM1281WBRZ is certified to UL 1577 (3000 VRMS, 1 min), DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 565 VPEAK), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1. The "W" in the part number denotes VDE 0884-17 approval, marked by an asterisk on the package.
How does the refresh feature of ADUM1281WBRZ ensure DC correctness?
The ADUM1281WBRZ incorporates a patented internal refresh circuit that cycles every 1.6 µs to sample and retransmit the last valid input state. This guarantees DC-correct output behavior during static input conditions or extended periods without signal transitions - a key advantage over optocouplers and competing capacitive isolators.
Is ADUM1281WBRZ pin-compatible with other ADuM128x family members?
ADUM1281WBRZ shares the same 8-pin SOIC package and pinout as ADUM1280WBRZ (Table 21), but differs from ADUM1285/ADUM1286 which have default-low outputs and alternate pin configurations. Pin compatibility is limited to same-output-default variants; substitution requires verification of truth table behavior and default state requirements.
ADUM1281WBRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 35ns, 35ns
- Pulse Width Distortion (Max):
- 3ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADUM1281WBRZ FAQ
1.How can I place an order for ADUM1281WBRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1281WBRZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADUM1281WBRZ reliable?
The price and inventory of ADUM1281WBRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1281WBRZ is usually 5 days.
3.What payment methods are accepted for ADUM1281WBRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1281WBRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1281WBRZ?
ADUM1281WBRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1281WBRZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADUM1281WBRZ?
For technical support, including ADUM1281WBRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1281WBRZ requirements.
6.How does Aetrix verify that ADUM1281WBRZ is sourced from the original manufacturer or authorized distributors?
All ADUM1281WBRZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADUM1281WBRZ meets industry standards.
7.What is the process for return or replacement of ADUM1281WBRZ?
All ADUM1281WBRZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1281WBRZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADUM1281WBRZ part is unused and in its original packaging.
Return procedure for ADUM1281WBRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1281WBRZ Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
