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Analog Devices Inc. ADUM1281WCRZ-RL7
- Part No.:
- ADUM1281WCRZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1281WCRZ-RL7.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,603
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Product details
Overview
ADUM1281WCRZ-RL7 from Analog Devices is a 3 kVRMS dual-channel digital isolator with iCoupler® technology, providing bidirectional signal isolation between two independent circuits. It delivers 100 Mbps data rate, 23 ns typical propagation delay, and 3.3 V to 5 V level translation across the isolation barrier. It is used in industrial field bus interfaces and hybrid electric vehicle battery monitoring systems where high common-mode transient immunity (>25 kV/µs) and AEC-Q100 qualification are required.
For engineers reviewing the ADUM1281WCRZ-RL7 datasheet, ADUM1281WCRZ-RL7 pinout, ADUM1281WCRZ-RL7 application, or ADUM1281WCRZ-RL7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, automotive-grade safety certifications (UL 1577, VDE 0884-17, IEC 62368-1), and confirmed alternative options for dual-channel isolated communication paths.
Technical Context
The ADUM1281WCRZ-RL7 implements two independent air-core transformer-based isolation channels using Analog Devices' proprietary iCoupler® process. Its patented refresh circuit ensures DC correctness without input transitions, and its default-high output behavior on both channels distinguishes it from ADuM1285/ADuM1286 variants.
It supports mixed-voltage operation (e.g., 5 V on Side 1 / 3.3 V on Side 2), operates from −40°C to +125°C, and meets reinforced insulation requirements per DIN EN IEC 60747-17 (VDE 0884-17) with VIORM = 565 VPEAK and VISO = 3000 VRMS for 1 minute.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 100 Mbps NRZ - enables high-speed SPI, RS-485, or CAN FD interface isolation without timing bottlenecks. |
| Propagation Delay | 23 ns typical - ensures tight timing alignment in motor control feedback loops and real-time sensor interfaces. |
| 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 - satisfies reinforced insulation requirements for functional safety in battery management and grid-connected inverters. |
| Supply Voltage Range | 3.135 V to 5.5 V per side - supports interoperability between legacy 5 V logic and modern 3.3 V microcontrollers without external level shifters. |
| Default Output State | High on both outputs - prevents undefined states during power-up or brownout conditions in critical control paths. |
| Operating Temperature | −40°C to +125°C - certified for under-hood automotive use and industrial ambient conditions without derating. |
| Safety Certifications | UL 1577, VDE 0884-17 (reinforced), IEC 62368-1, IEC 61010-1 - enables direct integration into safety-critical systems without additional certification overhead. |
Pinout & Package
Narrow-body, RoHS-compliant 8-lead SOIC package (SOIC_N), 5.3 mm width, creepage/clearance ≥4.0 mm, reinforced insulation barrier separating Pins 1–4 (Side 1) from Pins 5–8 (Side 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side supply | Power source for Side 1 logic and transformers; must be stable within 3.135 V–5.5 V for reliable refresh and output drive. |
| 2 - VOA | Output A | Isolated output channel A, default-high; drives downstream logic or transceiver inputs on Side 2. |
| 3 - VIB | Input B | Logic input on Side 1 for Channel B; accepts CMOS levels referenced to VDD1/GND1. |
| 4 - GND1 | Input-side ground | Reference return for Side 1 supplies and inputs; must be separated from GND2 by ≥4.0 mm PCB clearance. |
| 5 - GND2 | Output-side ground | Reference return for Side 2 supplies and outputs; galvanically isolated from GND1; forms safety barrier boundary. |
| 6 - VOB | Output B | Isolated output channel B, default-high; synchronized with VOA for dual-signal isolation (e.g., differential clock/data pairs). |
| 7 - VIA | Input A | Logic input on Side 1 for Channel A; functionally identical to VIB but assigned to first channel in truth table. |
| 8 - VDD2 | Output-side supply | Power source for Side 2 logic and output drivers; supports independent voltage domain (e.g., 3.3 V while VDD1 = 5 V). |
Key Features
| Feature | Design Value |
|---|---|
| Patented refresh circuit | Maintains DC-correct output state indefinitely without input toggling - eliminates need for external watchdog or periodic polling in low-duty-cycle systems. |
| Bidirectional channel independence | Each channel operates fully independently - allows asymmetric data flow (e.g., UART TX/RX or SPI SCLK/MOSI on separate paths) without crosstalk or skew coupling. |
| Level translation capability | Supports 3.3 V ↔ 5 V translation across isolation barrier - enables direct interfacing between mixed-voltage subsystems (e.g., MCU at 3.3 V driving 5 V ADC or actuator driver). |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications up to +125°C ambient - permits use in battery monitors, motor control units, and charging systems without requalification. |
| High CMTI with low jitter | 25 kV/µs common-mode immunity + 1 ns jitter - preserves signal edge integrity in high-dV/dt environments like SiC/GaN inverter gate drives. |
| Reinforced insulation architecture | Dual-molded transformer structure with VIORM = 565 VPEAK - satisfies single-fault safety requirements per ISO 26262 ASIL-B/C without external redundancy. |
Applications
| Industrial Field Bus Isolation | Automotive Battery Monitor Interface |
|---|---|
Use Scenario: Isolating RS-485 or CAN transceivers from host MCU in PLC backplanes or distributed I/O modules. IC Role / Device Role / Timing Role: Dual-channel isolator bridging controller-side logic and bus-side transceiver, preserving signal timing and fault containment. Use Value: Prevents ground loop currents and high-voltage transients from propagating to the controller, enabling reliable communication in factory automation with 25 kV/µs noise immunity. |
Use Scenario: Isolating cell voltage and temperature sensing signals from battery management system (BMS) MCU in EV traction batteries. IC Role / Device Role / Timing Role: Providing reinforced isolation for analog front-end digitization clocks and digital status lines between high-voltage battery stack and low-voltage control domain. Use Value: Meets IEC 62368-1 reinforced insulation requirements and supports AEC-Q100 operation at 125°C ambient, ensuring functional safety compliance without derating. |
| Motor Drive Feedback Isolation | Industrial Data Converter Interface |
Use Scenario: Isolating encoder quadrature signals and current-sense ADC outputs in servo drives with IGBT/SiC inverters. IC Role / Device Role / Timing Role: Transmitting high-fidelity position and current feedback across isolation barrier with ≤23 ns propagation delay and <2 ns pulse width distortion. Use Value: Enables precise closed-loop control with minimal latency impact, supporting >20 kHz PWM switching frequencies in real-time motion control systems. |
Use Scenario: Isolating serial interface (SPI/I²C) between precision ADC/DAC and host processor in medical or test equipment. IC Role / Device Role / Timing Role: Electrically separating sensitive analog measurement circuitry from noisy digital processing domains while maintaining synchronous data transfer. Use Value: Eliminates measurement errors caused by ground bounce or RF coupling, achieving >16-bit effective resolution in isolated data acquisition systems. |
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; 150 Mbps max data rate; no AEC-Q100 qualification; different pinout (VOA/VIA swapped vs. ADUM1281WCRZ-RL7). | Targeted at industrial automation, not automotive; lacks reinforced insulation certification for battery systems. | Choose when higher speed is needed and safety certification is not required; requires PCB layout change due to pin mismatch. |
| ISO7721DWR | 5000 VRMS isolation; 100 Mbps; 100 kV/µs CMTI; AEC-Q100 qualified; same 8-pin SOIC package but different pin mapping (GND1/GND2 positions differ). | Higher isolation and CMTI suited for HV inverter gate drive, but default output state is low - incompatible with ADUM1281WCRZ-RL7's default-high logic. | Consider for enhanced noise immunity in solar inverters; verify truth table compatibility before substitution - not drop-in. |
Compared with SI8621ED-B-IS and ISO7721DWR, ADUM1281WCRZ-RL7 uniquely combines AEC-Q100 qualification, default-high outputs, and VDE 0884-17 reinforced certification in an industry-standard SOIC footprint - making it optimal for automotive BMS and industrial safety-rated designs requiring predictable startup behavior and regulatory traceability.
Availability
ADUM1281WCRZ-RL7 is available at Aetrix Electronics and suitable for industrial field bus isolation, automotive battery monitor interfaces, and motor drive feedback systems requiring stable component supply, long-term lifecycle support, and full traceability.
Supply support for ADUM1281WCRZ-RL7 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 with precision and reliability.
The ADuM128x family was designed specifically for robust, high-speed digital isolation in safety-critical systems - emphasizing AEC-Q100 qualification, reinforced insulation, and deterministic default-state behavior for automotive and industrial control applications.
FAQ
What is the default output state of ADUM1281WCRZ-RL7?
The ADUM1281WCRZ-RL7 has a default-high output state on both VOA and VOB pins when power is applied only to VDD2 or during input-side undervoltage conditions. This behavior is confirmed in the ADuM1281 truth table (Table 23) and ensures defined logic levels at startup - a key differentiator from ADuM1285/ADuM1286 variants which default low. The refresh circuit maintains this state without input transitions.
Does ADUM1281WCRZ-RL7 support mixed-supply operation?
Yes, ADUM1281WCRZ-RL7 supports mixed-supply operation: VDD1 and VDD2 may operate independently at 3.135 V to 5.5 V each, including combinations such as 5 V on Side 1 and 3.3 V on Side 2. Electrical characteristics for mixed 5 V/3.3 V operation are specified in Table 7 and Table 8 of the Rev. E datasheet, confirming full functionality and timing compliance across all supported data rates up to 100 Mbps.
What safety certifications apply to ADUM1281WCRZ-RL7?
ADUM1281WCRZ-RL7 carries UL 1577 (3000 VRMS, 1 min), DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation (VIORM = 565 VPEAK), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1 certifications. These are explicitly listed in Table 14 and validated in Tables 15–16 of the datasheet. The "W" in the part number denotes VDE 0884-17 approval, marked by an asterisk on the package.
How does ADUM1281WCRZ-RL7 achieve DC correctness without input toggling?
ADUM1281WCRZ-RL7 uses a patented internal refresh circuit that periodically samples and retransmits the last valid input state across the isolation barrier - ensuring output remains accurate even during prolonged static input conditions. This feature is documented in the General Description section and enables reliable operation in low-activity control loops, such as enable/disable signaling or fault status latching, without external supervision.
What is the maximum continuous working voltage for ADUM1281WCRZ-RL7?
The maximum continuous working voltage for ADUM1281WCRZ-RL7 is 565 VPEAK (bipolar AC waveform), as specified in Table 19 and confirmed under DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation requirements. This value defines the highest steady-state voltage the isolation barrier can sustain continuously while maintaining safety integrity - critical for battery stack monitoring and industrial HV bus interfaces.
ADUM1281WCRZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-RL7 FAQ
1.How can I place an order for ADUM1281WCRZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1281WCRZ-RL7 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-RL7 reliable?
The price and inventory of ADUM1281WCRZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1281WCRZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADUM1281WCRZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1281WCRZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1281WCRZ-RL7?
ADUM1281WCRZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1281WCRZ-RL7 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-RL7?
For technical support, including ADUM1281WCRZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1281WCRZ-RL7 requirements.
6.How does Aetrix verify that ADUM1281WCRZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADUM1281WCRZ-RL7 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-RL7 meets industry standards.
7.What is the process for return or replacement of ADUM1281WCRZ-RL7?
All ADUM1281WCRZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1281WCRZ-RL7, 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-RL7 part is unused and in its original packaging.
Return procedure for ADUM1281WCRZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1281WCRZ-RL7 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
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