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Analog Devices Inc. ADUM1281WCRZ
- Part No.:
- ADUM1281WCRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1281WCRZ.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,619
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Product details
Overview
ADUM1281WCRZ 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 industrial field bus interfaces where high common-mode transient immunity (>25 kV/µs) and AEC-Q100 qualification are required.
For engineers reviewing the ADUM1281WCRZ datasheet, ADUM1281WCRZ pinout, ADUM1281WCRZ application, or ADUM1281WCRZ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in motor drive and battery monitoring systems, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The ADUM1281WCRZ 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 per DIN EN IEC 60747-17 (VDE 0884-17), with channel-to-channel matching of ≤5 ns (codirectional) and ≤10 ns (opposing-direction) at C-grade performance. The device supports mixed-voltage operation (e.g., 5 V side 1 / 3.3 V side 2) without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 100 Mbps NRZ - enables high-speed SPI, RS-485, and CAN FD interface isolation without bandwidth bottleneck. |
| Propagation Delay | 23 ns typical - supports tight-timing control loops in motor drives and real-time feedback systems. |
| Common-Mode Transient Immunity | >25 kV/µs - maintains signal integrity in noisy industrial environments with fast-switching power electronics. |
| Isolation Rating | 3000 VRMS for 1 min, VIORM = 565 VPEAK - meets reinforced insulation requirements for IEC/EN/CSA 62368-1 and 61010-1 safety standards. |
| Supply Voltage Range | 3.135 V to 5.5 V per side - allows interoperability between 3.3 V microcontrollers and 5 V analog front-ends or field buses. |
| Default Output State | High - ensures fail-safe logic-high assertion on isolated outputs during power-up or input-side brownout. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
Narrow-body, RoHS-compliant 8-lead SOIC package (SOIC_N) with creepage and clearance ≥4.0 mm, rated for reinforced insulation per VDE 0884-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side power supply | Supplies 3.135–5.5 V to Side 1 logic and transformer driver; powers inputs VIA/VIB. |
| 2 - VOA | Output A signal | Isolated output corresponding to input VIA; default-high when unpowered or static. |
| 3 - VIB | Input B signal | Logic input on Side 1; referenced to GND1 and powered by VDD1. |
| 4 - GND1 | Input-side ground reference | Return path for Side 1 signals and supply; must be separated from GND2 by ≥4 mm PCB clearance. |
| 5 - GND2 | Output-side ground reference | Return path for Side 2 signals and supply; galvanically isolated from GND1. |
| 6 - VOB | Output B signal | Isolated output corresponding to input VIB; maintains default-high state during input-side power loss. |
| 7 - VIA | Input A signal | Logic input on Side 1; controls VOA output across isolation barrier. |
| 8 - VDD2 | Output-side power supply | Supplies 3.135–5.5 V to Side 2 logic and transformer receiver; powers outputs VOA/VOB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel independence | Two fully isolated, non-interacting signal paths enable simultaneous upstream/downstream communication (e.g., SPI MISO/MOSI). |
| DC-correct refresh architecture | Patented internal refresh ensures output remains valid during prolonged static input - no optocoupler-like output decay. |
| Level translation capability | Accepts 3.3 V inputs while driving 5 V outputs (or vice versa), eliminating external level shifters in mixed-voltage systems. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and motor control units operating at 125°C ambient. |
| High CMTI robustness | Withstands >25 kV/µs common-mode transients - critical for gate driver feedback in SiC/GaN inverters and industrial PLC I/O modules. |
Applications
| Industrial Field Bus Isolation | Motor Drive Feedback Interface |
|---|---|
Use Scenario: Isolating RS-485 or CAN transceiver data lines in programmable logic controllers and distributed I/O modules exposed to high EMI. IC Role / Device Role / Timing Role: Dual-channel digital isolator providing galvanic separation between controller MCU and bus PHY, preserving signal integrity at up to 100 Mbps. Use Value: Enables reliable communication over long cable runs in factory automation, avoiding ground loop errors and meeting IEC 61000-4-4 surge immunity requirements. |
Use Scenario: Transmitting PWM feedback and fault signals from isolated gate drivers to MCU in 3-phase inverter stages. IC Role / Device Role / Timing Role: Isolating high-speed current-sense ADC outputs and overcurrent trip signals with <23 ns delay to maintain closed-loop timing margins. Use Value: Supports precise timing-critical protection response (<100 ns total latency) while maintaining 3000 VRMS isolation between low-voltage control and 600 V+ power domains. |
| Battery Management System (BMS) | Hybrid Electric Vehicle Onboard Charger |
Use Scenario: Isolating cell voltage measurement data and pack contactor control signals in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Providing reinforced insulation between 400–800 V battery stack monitoring ICs and 3.3 V microcontroller domain. Use Value: Meets UL 1577 and VDE 0884-17 requirements for functional safety in ASIL-B systems, with default-high outputs ensuring safe open-contact state on failure. |
Use Scenario: Isolating digital control signals between AC/DC PFC stage and DC/DC LLC converter in vehicle onboard chargers. IC Role / Device Role / Timing Role: Transmitting gate drive enable/disable and fault flags across isolation barrier with <5 ns channel-to-channel skew. Use Value: Enables synchronized multi-phase switching with minimal timing jitter, improving efficiency and reducing EMI in 11 kW+ OBC designs. |
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 | Capacitive isolation; 5000 VRMS rating; 150 Mbps max; no default-high output - requires external pull-up for fail-safe state. | Higher isolation voltage but lacks integrated refresh and default-high behavior; less suitable for power-loss-safe BMS monitoring. | Select when higher isolation voltage is prioritized over guaranteed fail-safe output state during brownout. |
| ISO7721DWR | Capacitive isolation; 5000 VRMS; 100 Mbps; default-low output; no AEC-Q100 qualification. | Not automotive-qualified; unsuitable for under-hood HEV applications requiring 125°C operation and AEC-Q100 compliance. | Choose for cost-sensitive industrial applications where automotive qualification and default-high logic are not required. |
Compared with SI8621ED-B-IS and ISO7721DWR, ADUM1281WCRZ uniquely combines AEC-Q100 Grade 1 qualification, default-high output, and iCoupler® transformer-based DC correctness - making it the only option among the three qualified for fail-safe battery monitoring and motor control in hybrid electric vehicles.
Availability
ADUM1281WCRZ is available at Aetrix Electronics and suitable for industrial field bus isolation, motor drive feedback interfaces, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADUM1281WCRZ 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 precision instrumentation, industrial automation, and automotive markets.
The ADuM128x family was designed specifically for high-reliability, high-speed digital isolation in safety-critical systems - emphasizing low propagation delay, tight channel matching, and reinforced insulation compliance for automotive and industrial applications.
FAQ
What is the default output state of ADUM1281WCRZ during power-up or input-side undervoltage?
The ADUM1281WCRZ has a default-high output configuration. When VDD1 is unpowered or below UVLO threshold (2.65 V), both VOA and VOB assert logic high after a maximum 1.6 µs refresh period. This behavior is intrinsic to the ADUM1281/ADUM1286 variant group and ensures fail-safe signaling in battery monitor and motor control applications where open-circuit detection is critical. The ADUM1281WCRZ maintains this behavior across all operating temperatures and supply voltages within specification.
Does ADUM1281WCRZ support mixed-voltage operation between 3.3 V and 5 V domains?
Yes, ADUM1281WCRZ supports true mixed-voltage operation: VDD1 may be 3.3 V while VDD2 is 5 V (or vice versa), with full 100 Mbps data rate and specified timing performance. Tables 7 and 10 in the Rev. E datasheet confirm propagation delay (20–27 ns typical) and supply current remain within spec under 3.3 V/5 V and 5 V/3.3 V configurations. This eliminates need for external level shifters in interfaces between 3.3 V MCUs and 5 V analog front-ends or field bus transceivers.
What safety certifications apply to ADUM1281WCRZ?
ADUM1281WCRZ carries UL 1577 (3000 VRMS, 1 min), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) approvals. It is rated for reinforced insulation with VIORM = 565 VPEAK and VIOWM = 400 VRMS. The "W" in ADUM1281WCRZ denotes VDE 0884-17 certification - confirmed by the * marking on the package and test voltage of ≥1050 VPEAK per Method B1.
How does ADUM1281WCRZ achieve DC correctness without optical components?
ADUM1281WCRZ uses Analog Devices' iCoupler® technology: monolithic air-core transformers with integrated CMOS interface circuitry. Its patented refresh circuit periodically samples input states and retransmits them across the barrier - ensuring output remains accurate during static input conditions. Unlike optocouplers, this architecture avoids LED degradation and provides guaranteed DC correctness with no output drift, validated across −40°C to +125°C and 10-year lifetime per insulation lifetime modeling.
Is ADUM1281WCRZ pin-compatible with other members of the ADuM128x family?
No - ADUM1281WCRZ uses the pinout defined in Figure 5 and Table 21 (VDD1, VOA, VIB, GND1, GND2, VOB, VIA, VDD2), which differs from ADUM1280/ADUM1285 (Figure 4). Specifically, input pins VIA/VIB and output pins VOA/VOB are rearranged. Swapping ADUM1281WCRZ for ADUM1280WCRZ without PCB revision will cause functional failure. Pin compatibility exists only within same variant group: ADUM1281/ADUM1286 share identical pinout; ADUM1280/ADUM1285 share another.
ADUM1281WCRZ 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:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 24ns, 24ns
- Pulse Width Distortion (Max):
- 2ns
- 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
ADUM1281WCRZ FAQ
1.How can I place an order for ADUM1281WCRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1281WCRZ 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 ADUM1281WCRZ reliable?
The price and inventory of ADUM1281WCRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1281WCRZ is usually 5 days.
3.What payment methods are accepted for ADUM1281WCRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1281WCRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1281WCRZ?
ADUM1281WCRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1281WCRZ 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 ADUM1281WCRZ?
For technical support, including ADUM1281WCRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1281WCRZ requirements.
6.How does Aetrix verify that ADUM1281WCRZ is sourced from the original manufacturer or authorized distributors?
All ADUM1281WCRZ 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 ADUM1281WCRZ meets industry standards.
7.What is the process for return or replacement of ADUM1281WCRZ?
All ADUM1281WCRZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1281WCRZ, 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 ADUM1281WCRZ part is unused and in its original packaging.
Return procedure for ADUM1281WCRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1281WCRZ Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
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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
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