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Analog Devices Inc. ADUM1281WARZ-RL7
- Part No.:
- ADUM1281WARZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1281WARZ-RL7.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
ADUM1281WARZ-RL7 from Analog Devices is a 3 kVRMS dual-channel digital isolator using iCoupler® transformer-based technology, providing bidirectional signal isolation with 100 Mbps data rate, 23 ns typical propagation delay, and 3.3 V to 5 V level translation. It operates across −40°C to +125°C and features default-high output logic for robust power-up behavior in industrial motor drives and battery monitoring systems.
For engineers reviewing the ADUM1281WARZ-RL7 datasheet, ADUM1281WARZ-RL7 pinout, ADUM1281WARZ-RL7 application, or ADUM1281WARZ-RL7 equivalent, this page delivers verified specifications, safety-certified insulation parameters, channel-level timing behavior, and automotive-grade (AEC-Q100) design context for high-noise industrial and HEV subsystems.
Technical Context
The ADUM1281WARZ-RL7 implements two independent air-core transformer isolation channels with patented refresh circuitry ensuring DC-correct output states during input inactivity. Its architecture supports mixed-voltage operation (e.g., 3.3 V side 1 / 5 V side 2), enabling level translation without external logic.
It achieves <2 ns pulse width distortion and 5 ns codirectional channel matching at C-grade performance, with common-mode transient immunity exceeding 25 kV/µs - critical for gate driver feedback and isolated ADC interfaces in high-dV/dt environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 100 Mbps NRZ - supports high-speed SPI, RS-485, and CAN FD isolation without protocol overhead. |
| Propagation Delay | 23 ns typical - enables tight-timing control loops in motor phase current sensing and PWM feedback paths. |
| Isolation Rating | 3000 VRMS for 1 minute - certified reinforced insulation per UL 1577, VDE 0884-17, and IEC 62368-1. |
| Common-Mode Immunity | >25 kV/µs - maintains signal integrity in noisy inverters and battery management systems with fast-switching SiC/GaN FETs. |
| Supply Range | 3.135 V to 5.5 V per side - allows interoperability between 3.3 V microcontrollers and 5 V analog front-ends. |
| Default Output State | High - ensures fail-safe logic state on power-up or input-side brownout in safety-critical monitoring circuits. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial PLC applications. |
| AEC-Q100 Grade | Qualified - meets stress testing requirements for automotive electronics including temperature cycling and HTOL. |
Pinout & Package
Narrow-body 8-lead SOIC package (SOIC_N), RoHS-compliant, with creepage/clearance ≥4.0 mm and internal insulation gap ≥18 µm per VDE 0884-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side supply | 3.135–5.5 V power for side 1 logic and transformers; UVLO threshold at 2.75 V. |
| 2 - VOA | Output A | Isolated logic output driven by input A; default-high when VDD1 powered and input inactive. |
| 3 - VIB | Input B | Logic input referenced to GND1; accepts 0.3×VDD1 to 0.7×VDD1 thresholds for noise margin. |
| 4 - GND1 | Input-side ground | Reference return for side 1; must be separated from GND2 by ≥4.0 mm PCB clearance. |
| 5 - GND2 | Output-side ground | Reference return for side 2; galvanically isolated from GND1; defines output voltage domain. |
| 6 - VOB | Output B | Isolated logic output driven by input B; synchronized with VOA within 5 ns codirectional skew. |
| 7 - VIA | Input A | Logic input referenced to GND1; controls VOA; supports 100 Mbps with <2 ns PWD. |
| 8 - VDD2 | Output-side supply | 3.135–5.5 V power for side 2 logic; enables level translation when VDD1 ≠ VDD2. |
Key Features
| Feature | Design Value |
|---|---|
| Patented refresh circuitry | Maintains DC-correct output state indefinitely without input transitions - eliminates optocoupler-style drift in static control signals. |
| Reinforced insulation | VIORM = 565 VPEAK, VISO = 3000 VRMS - satisfies single protection barrier requirements for functional safety in IEC 61800-5-2 drives. |
| High CMTI | >25 kV/µs - prevents false triggering in gate driver feedback paths exposed to >100 V/ns switching transients. |
| Low propagation skew | 5 ns codirectional channel matching - enables precise dual-signal timing alignment for isolated encoder or resolver interfaces. |
| Wide supply compatibility | 3.135–5.5 V per side - supports direct connection to 3.3 V MCU GPIO and 5 V analog sensors without level shifters. |
| AEC-Q100 qualification | Automotive-grade reliability - validated for 15-year lifetime in hybrid electric vehicle battery monitors and onboard chargers. |
Applications
| Motor Drive Feedback Isolation | Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating phase current sense signals and PWM gate drive feedback in 400 V traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator conveying high-side current measurement and low-side PWM status with <5 ns inter-channel skew. Use Value: Enables real-time overcurrent detection with 23 ns latency, supporting SIL-2 compliant fault response in ISO 26262 ASIL-C systems. |
Use Scenario: Isolating cell voltage and temperature measurements from microcontroller in 800 V EV battery packs. IC Role / Device Role / Timing Role: Providing reinforced insulation barrier between high-voltage battery stack and low-voltage MCU domain. Use Value: Meets 565 VPEAK working voltage requirement per IEC 62619, enabling safe 1000 VDC system compliance. |
| Industrial Fieldbus Interface | Isolated Data Converter Interface |
Use Scenario: Isolating RS-485 transceiver control lines and data paths in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional isolator handling DE/RE control and differential data with 100 Mbps capability. Use Value: Eliminates ground loop errors and withstands >25 kV/µs transients induced by nearby VFDs and welding equipment. |
Use Scenario: Isolating SPI clock, data, and frame sync between MCU and isolated ADC in precision current shunt measurement. IC Role / Device Role / Timing Role: Dual-channel isolator preserving SPI timing integrity with <2 ns pulse width distortion. Use Value: Maintains 16-bit ADC accuracy by preventing jitter-induced sampling error in 1 MSPS 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 | Capacitive isolation; 5000 VRMS rating; 150 Mbps max; no default-high output on power-up. | Lacks AEC-Q100 qualification; higher CMTI (75 kV/µs) but unqualified for automotive under-hood use. | Select for cost-sensitive industrial designs requiring higher isolation voltage but not automotive qualification. |
| ISO7721DWR | Capacitive isolation; 5000 VRMS; 100 Mbps; default-low output; lower quiescent current (1.5 mA per side @ 3.3 V). | No AEC-Q100 grade; VIORM = 800 VPEAK - insufficient for 800 V BMS applications requiring 565 VPEAK. | Prefer for non-automotive 3.3 V systems where ultra-low power dominates over reinforced insulation voltage. |
Compared with SI8621ED-B-IS and ISO7721DWR, ADUM1281WARZ-RL7 uniquely combines AEC-Q100 qualification, default-high output behavior, and 565 VPEAK VIORM - making it the only option among the three qualified for functional safety in automotive battery monitoring and motor control.
Availability
ADUM1281WARZ-RL7 is available at Aetrix Electronics and suitable for industrial motor drives, automotive battery management systems, and isolated data converter interfaces requiring stable component supply across extended temperature and regulatory-compliant isolation performance.
Supply support for ADUM1281WARZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADuM128x family delivers transformer-based digital isolation optimized for high-noise, safety-critical applications - designed specifically for motor control feedback, BMS monitoring, and industrial fieldbus systems demanding AEC-Q100 and reinforced insulation compliance.
FAQ
What is the maximum data rate supported by ADUM1281WARZ-RL7?
ADUM1281WARZ-RL7 supports up to 100 Mbps in NRZ format, verified across all operating conditions (−40°C to +125°C, 3.135 V to 5.5 V supplies). This enables high-speed SPI, RS-485, and CAN FD isolation without protocol overhead or timing degradation. The 23 ns typical propagation delay and <2 ns pulse width distortion ensure signal fidelity at full rate.
Does ADUM1281WARZ-RL7 support level translation between different supply voltages?
Yes, ADUM1281WARZ-RL7 supports true bidirectional level translation: side 1 (VDD1) and side 2 (VDD2) operate independently from 3.135 V to 5.5 V. Mixed-supply configurations - such as 3.3 V MCU interfacing to 5 V analog sensors - are fully supported per Tables 7 and 10 in the datasheet, with no external components required.
What safety certifications does ADUM1281WARZ-RL7 hold?
ADUM1281WARZ-RL7 is certified to UL 1577 (3000 VRMS), DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 565 VPEAK), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1. It is also AEC-Q100 qualified for automotive applications, with full test reports available from Analog Devices.
How does the default-high output behavior of ADUM1281WARZ-RL7 improve system safety?
ADUM1281WARZ-RL7 asserts high logic levels on both outputs (VOA and VOB) when VDD1 is powered but inputs are inactive or floating - a fail-safe state critical for disabling gate drivers or enabling watchdog timeout paths. This behavior is guaranteed by internal refresh circuitry and eliminates reliance on external pull-ups in safety-critical startup sequences.
What is the common-mode transient immunity (CMTI) specification for ADUM1281WARZ-RL7?
ADUM1281WARZ-RL7 guarantees >25 kV/µs common-mode transient immunity, tested per IEC 61000-4-4 with 800 V transients at 1000 V common-mode bias. This performance is essential for maintaining signal integrity in high-dV/dt environments like SiC inverter gate driver feedback and isolated current sensing in motor drives.
ADUM1281WARZ-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:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 50ns, 50ns
- Pulse Width Distortion (Max):
- 10ns
- 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
ADUM1281WARZ-RL7 FAQ
1.How can I place an order for ADUM1281WARZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1281WARZ-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 ADUM1281WARZ-RL7 reliable?
The price and inventory of ADUM1281WARZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1281WARZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADUM1281WARZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1281WARZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1281WARZ-RL7?
ADUM1281WARZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1281WARZ-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 ADUM1281WARZ-RL7?
For technical support, including ADUM1281WARZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1281WARZ-RL7 requirements.
6.How does Aetrix verify that ADUM1281WARZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADUM1281WARZ-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 ADUM1281WARZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADUM1281WARZ-RL7?
All ADUM1281WARZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1281WARZ-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 ADUM1281WARZ-RL7 part is unused and in its original packaging.
Return procedure for ADUM1281WARZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1281WARZ-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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