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Analog Devices Inc. ADUM1285WCRZ
- Part No.:
- ADUM1285WCRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1285WCRZ.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
ADUM1285WCRZ from Analog Devices is a 3 kVRMS dual-channel digital isolator based on iCoupler® transformer technology, providing bidirectional signal isolation with default-low output logic state. It supports up to 100 Mbps NRZ data rate, 23 ns typical propagation delay, and operates across 3.135 V–5.5 V supply ranges on both sides for level translation. It is used in high-noise industrial field bus interfaces requiring reinforced insulation and automotive battery monitoring systems.
For engineers reviewing the ADUM1285WCRZ datasheet, ADUM1285WCRZ pinout, ADUM1285WCRZ application, or ADUM1285WCRZ equivalent, this page delivers verified specifications, safety-certified isolation parameters, channel-level timing behavior, and real-world design context for AEC-Q100-compliant automotive and industrial embedded systems.
Technical Context
The ADUM1285WCRZ implements two independent galvanic isolation channels using monolithic air-core transformers, enabling dc-correct signal transmission without optical components. Its patented refresh circuit maintains output state during input inactivity, ensuring reliable default-low behavior when inputs are static or unpowered.
It supports mixed-voltage operation (e.g., 5 V side 1 / 3.3 V side 2), delivers >25 kV/μs common-mode transient immunity, and meets reinforced insulation requirements per DIN EN IEC 60747-17 (VDE 0884-17) with VIORM = 565 VPEAK and VISO = 3000 VRMS.
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 real-time control loops and motor drive feedback paths. |
| Common-Mode Transient Immunity | >25 kV/μs - sustains signal integrity in noisy environments like inverters and battery management systems. |
| Isolation Rating | 3000 VRMS for 1 minute - certified for reinforced insulation per UL 1577 and IEC/EN/CSA 62368-1. |
| Default Output State | Low - prevents unintended activation of downstream logic or power stages during power-up or fault conditions. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
| Supply Voltage Range | 3.135 V to 5.5 V per side - supports interoperability between 3.3 V microcontrollers and 5 V analog/sensor domains. |
Pinout & Package
Narrow-body, RoHS-compliant 8-lead SOIC package (SOIC_N) with creepage and clearance ≥4.0 mm, rated for reinforced insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side supply | Power domain for side 1 logic inputs; accepts 3.135–5.5 V; enables level translation from side 1 to side 2. |
| 2 - VIA | Input A | Primary logic input channel on side 1; drives isolated output VOA on side 2. |
| 3 - VIB | Input B | Secondary logic input channel on side 1; drives isolated output VOB on side 2. |
| 4 - GND1 | Input-side ground | Reference return for side 1; must be separated from GND2 to maintain galvanic isolation barrier. |
| 5 - GND2 | Output-side ground | Reference return for side 2; electrically isolated from GND1; defines output logic thresholds. |
| 6 - VOB | Output B | Isolated replica of VIB; default-low state ensures safe deactivation if side 1 loses power. |
| 7 - VOA | Output A | Isolated replica of VIA; synchronized with VOB within 2 ns pulse width distortion at 100 Mbps. |
| 8 - VDD2 | Output-side supply | Power domain for side 2 outputs; independent of VDD1; supports asymmetric voltage operation. |
Key Features
| Feature | Design Value |
|---|---|
| Patented refresh circuit | Maintains dc-correct output state indefinitely without input transitions - eliminates need for external watchdog or clock injection. |
| High CMTI (>25 kV/μs) | Rejects fast transients from motor switching or lightning surges without data corruption or latch-up. |
| Default-low output configuration | Ensures fail-safe behavior in safety-critical applications such as battery disconnect control or gate driver enable lines. |
| AEC-Q100 qualification | Validated for automotive use including temperature cycling, humidity, and vibration - suitable for BMS and EV traction inverters. |
| Reinforced insulation certification | Meets VDE 0884-17 (VIORM = 565 VPEAK) and UL 1577 (3000 VRMS) - eliminates need for external creepage/clearance reinforcement. |
Applications
| Industrial Field Bus Isolation | Automotive Battery Monitor Interface |
|---|---|
Use Scenario: Isolating RS-485 or CAN transceivers in PLC backplanes exposed to 4 kV surge events and ground potential differences. IC Role / Device Role / Timing Role: Dual-channel signal isolator bridging controller and bus PHY; provides matched propagation delay (<5 ns skew) for differential pair integrity. Use Value: Prevents ground loop currents and common-mode noise from disrupting communication while maintaining <100 ns total latency at 25 Mbps. |
Use Scenario: Connecting cell voltage measurement ICs to MCU in high-voltage battery packs (up to 900 V DC). IC Role / Device Role / Timing Role: Galvanically isolates analog front-end ADC serial interface (SPI) and alert signals from MCU domain. Use Value: Enables safe, accurate cell monitoring under fast dv/dt conditions (>10 kV/μs) with no data loss during pack switching events. |
| Motor Drive Feedback Isolation | Industrial Data Converter Interface |
Use Scenario: Isolating encoder quadrature signals and current-sense amplifier outputs in servo drives operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: Bidirectional isolator preserving edge timing of position feedback; supports 100 Mbps for high-resolution resolvers. Use Value: Delivers sub-25 ns propagation delay and <2 ns pulse width distortion - critical for closed-loop position accuracy below ±0.1°. |
Use Scenario: Isolating SPI interface between precision SAR ADC (e.g., AD7682) and host processor in medical imaging or test equipment. IC Role / Device Role / Timing Role: Clock and data channel isolator supporting 1 MSPS conversion rates with deterministic timing. Use Value: Maintains SNR >90 dB by eliminating ground-borne noise coupling into analog measurement path via isolation barrier. |
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; default-high output. | Lacks AEC-Q100 qualification; higher CMTI (75 kV/μs) but no default-low safety state. | Prefer for non-automotive high-speed industrial comms where default-high is acceptable. |
| ISO7721DWR | Capacitive isolation; 5000 VRMS; 100 Mbps; default-low output; 125°C rating. | No VDE 0884-17 certification; only UL/IEC 62368-1; lower CMTI (42 kV/μs). | Acceptable for cost-sensitive industrial designs where full VDE compliance is not mandated. |
Compared with SI8621ED-B-IS and ISO7721DWR, the ADUM1285WCRZ uniquely combines AEC-Q100 qualification, VDE 0884-17 reinforced insulation, and guaranteed default-low output - making it the only drop-in option for automotive BMS and ISO 26262 ASIL-B signal isolation.
Availability
ADUM1285WCRZ 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 certified safety compliance.
Supply support for ADUM1285WCRZ 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 ADUM1285WCRZ belongs to the iCoupler® digital isolator product line, engineered specifically for replacing optocouplers in safety-critical, high-noise, and high-reliability applications demanding low latency, low power, and regulatory compliance.
FAQ
What is the default output state of the ADUM1285WCRZ?
The ADUM1285WCRZ has a default-low output state on both channels (VOA and VOB) when input power is absent or inputs are static. This behavior is intrinsic to the device architecture and ensures fail-safe operation in safety-critical circuits such as battery disconnect controls. The ADUM1285WCRZ maintains this state until valid logic transitions are applied to VIA or VIB, or until side 1 supply is restored.
Does the ADUM1285WCRZ support mixed-voltage operation?
Yes, the ADUM1285WCRZ supports true mixed-voltage operation: side 1 (VDD1) and side 2 (VDD2) can operate independently at 3.135 V–5.5 V, enabling level translation between 3.3 V microcontrollers and 5 V sensor or actuator domains. This capability is validated across all operating temperatures and data rates up to 100 Mbps, as confirmed in Tables 7 and 10 of the Rev. E datasheet.
What safety certifications does the ADUM1285WCRZ hold?
The ADUM1285WCRZ is certified to UL 1577 (3000 VRMS, 1 min), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation with VIORM = 565 VPEAK. These approvals are explicitly listed in Table 14 and Table 16 of the datasheet, and the "W" grade suffix denotes automotive qualification per AEC-Q100.
How does the ADUM1285WCRZ handle power-loss scenarios on one side?
When VDD1 is unpowered, the ADUM1285WCRZ outputs (VOA, VOB) default to low and remain stable; when VDD2 is unpowered, outputs become indeterminate but recover within 1.6 µs after VDD2 restoration. This behavior is documented in Table 24 (ADUM1285 Truth Table) and ensures predictable failure modes in partial-power-loss conditions common in automotive and industrial systems.
What is the maximum common-mode transient immunity (CMTI) of the ADUM1285WCRZ?
The ADUM1285WCRZ guarantees >25 kV/μs common-mode transient immunity, tested per IEC 61000-4-4 with 1000 V common-mode voltage and 800 V transient magnitude. This value is specified across all grades (A/WA to C/WC) and operating voltages (3.3 V, 5 V, and mixed), and is critical for reliable operation in motor drives and inverters where fast dv/dt noise is present.
ADUM1285WCRZ 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:
- 2/0
- 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
ADUM1285WCRZ FAQ
1.How can I place an order for ADUM1285WCRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1285WCRZ 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 ADUM1285WCRZ reliable?
The price and inventory of ADUM1285WCRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1285WCRZ is usually 5 days.
3.What payment methods are accepted for ADUM1285WCRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1285WCRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1285WCRZ?
ADUM1285WCRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1285WCRZ 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 ADUM1285WCRZ?
For technical support, including ADUM1285WCRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1285WCRZ requirements.
6.How does Aetrix verify that ADUM1285WCRZ is sourced from the original manufacturer or authorized distributors?
All ADUM1285WCRZ 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 ADUM1285WCRZ meets industry standards.
7.What is the process for return or replacement of ADUM1285WCRZ?
All ADUM1285WCRZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1285WCRZ, 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 ADUM1285WCRZ part is unused and in its original packaging.
Return procedure for ADUM1285WCRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1285WCRZ 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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