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Analog Devices Inc. ADUM2281CRIZ
- Part No.:
- ADUM2281CRIZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADUM2281CRIZ.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:124
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Product details
Overview
ADuM2281CRIZ from Analog Devices is a 5 kVRMS dual-channel digital isolator based on iCoupler® transformer technology, providing bidirectional signal isolation between two galvanically separated domains. It supports up to 100 Mbps data rate, features 24 ns maximum propagation delay, 3 V to 5.5 V supply compatibility per side, and default-high output logic state - enabling robust RS-485 transceiver isolation in industrial power supplies.
For engineers reviewing the ADuM2281CRIZ datasheet, ADuM2281CRIZ pinout, ADuM2281CRIZ application, or ADuM2281CRIZ equivalent, this page delivers verified specifications, safety-certified insulation parameters, channel-level truth table behavior, and design-critical thermal and transient immunity data for high-reliability embedded isolation.
Technical Context
The ADuM2281CRIZ implements monolithic air-core transformer coupling with integrated refresh circuitry to maintain DC correctness during input inactivity - a key differentiator from optocouplers. Its dual-channel architecture supports independent signal paths with tight channel-to-channel matching (≤5 ns skew) and low pulse width distortion (≤2 ns).
It operates across mixed-voltage configurations (e.g., 5 V side 1 / 3 V side 2), enabling level translation without external components. Safety compliance includes reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 (5000 VRMS), and IEC 60601-1 (2 MOPP), supporting medical and industrial system certification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS (1-minute withstand); enables safe operation in 600 VRMS mains-connected systems per IEC 61010-1. |
| Data Rate | Up to 100 Mbps (C grade); supports high-speed serial interfaces like isolated SPI or RS-485 at full line rate. |
| Propagation Delay | ≤24 ns max (5 V operation); ensures timing-critical control loops remain closed with minimal latency. |
| Common-Mode Transient Immunity | >25 kV/μs; maintains signal integrity in noisy motor drive or power converter environments. |
| Supply Range | 3.0 V to 5.5 V per side; allows direct interfacing with both legacy 5 V and modern low-voltage microcontrollers. |
| Default Output State | High (VOA/VOB = high when unpowered or during power-up); prevents undefined states in fail-safe control circuits. |
| Operating Temperature | −40°C to +125°C; qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
ADuM2281CRIZ uses a 16-lead SOIC wide-body package with enhanced creepage (8.7 mm) and clearance, optimized for reinforced insulation in high-voltage applications. Pin 1–8 form Side 1 (input side), Pin 9–16 form Side 2 (output side), with internal ground separation and no internal connection on NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, GND1 | Input-side ground reference | Provides low-impedance return path for Side 1 logic; must be decoupled locally to minimize noise coupling. |
| 3, VDD1 | Input-side supply | Accepts 3.0–5.5 V; powers input receivers and internal refresh logic; requires 0.1 µF bypass capacitor. |
| 4, VOA | Output A (Side 2) | Isolated logic output driven by input A; default-high behavior ensures safe state during power loss. |
| 5, VIB | Input B (Side 1) | CMOS-compatible input accepting 0.3×VDD1 to 0.7×VDD1 thresholds; supports 3 V/5 V logic families. |
| 12, VOB | Output B (Side 2) | Independent isolated output synchronized to input B; matches VOA timing within ≤5 ns skew. |
| 13, VIA | Input A (Side 1) | Primary input channel; drives VOA with sub-24 ns delay; shares same default-high recovery as VOB. |
| 14, VDD2 | Output-side supply | Independent 3.0–5.5 V rail; enables level translation (e.g., 5 V MCU → 3.3 V FPGA) across barrier. |
| 9, 16, GND2 | Output-side ground reference | Galvanically isolated return for Side 2; must not be connected to GND1 on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Patented refresh circuitry | Maintains DC-correct output state indefinitely without input toggling - critical for watchdog or enable signals. |
| Reinforced insulation rating | VIORM = 645 VPEAK per VDE 0884-17; eliminates need for external creepage barriers in medical 2-MOPP designs. |
| Bidirectional channel independence | Each channel operates autonomously; no shared timing or reset dependencies between A and B paths. |
| Low dynamic power consumption | 0.09 mA/Mbps (input), 0.04 mA/Mbps (output); reduces thermal load in dense isolation layouts. |
| High temperature reliability | Specified up to +125°C ambient; validated for 10-year insulation lifetime at 125°C per IEC 60747-17. |
Applications
| Industrial Motor Drives | Medical Patient Monitoring |
|---|---|
Use Scenario: Isolating gate driver control signals and current-sense feedback in 3-phase inverters operating at 600 V bus voltage. IC Role / Device Role / Timing Role: Dual-channel isolator separating PWM inputs (VIA/VIB) from gate driver outputs (VOA/VOB) with <24 ns delay to preserve dead-time integrity. Use Value: Enables compact, high-efficiency SiC/MOSFET drivers while meeting IEC 61800-5-1 reinforced insulation requirements. |
Use Scenario: Isolating UART communication between patient-connected ECG front-end and main processing unit in Class II medical devices. IC Role / Device Role / Timing Role: Providing 2-MOPP isolation (per IEC 60601-1) for bidirectional serial data with default-high outputs preventing spurious actuation during power sequencing. Use Value: Eliminates need for discrete optocouplers and level shifters, reducing BOM count and improving long-term reliability in life-critical systems. |
| Programmable Logic Controller I/O Modules | Isolated RS-485 Transceivers |
Use Scenario: Digitally isolating 24 V DC input sensing and relay output control in DIN-rail mounted PLC backplanes. IC Role / Device Role / Timing Role: Replacing two single-channel isolators with one ADuM2281CRIZ to reduce footprint and inter-channel skew in multi-point I/O scanning. Use Value: Achieves <5 ns channel matching for deterministic scan timing across 16+ I/O points without calibration. |
Use Scenario: Isolating differential data lines and control signals (DE/RE) in industrial RS-485 nodes exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Providing 100 Mbps-capable isolation for full-duplex RS-485 with >25 kV/μs CMTI to suppress bus noise during switching events. Use Value: Prevents data corruption in factory-floor networks where common-mode transients exceed 10 kV/μs. |
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 |
|---|---|---|---|
| ADuM2201ARWZ | Lower isolation rating (2.5 kVRMS), slower max data rate (10 Mbps), no refresh circuitry. | Suitable only for non-safety-critical, low-speed digital isolation (e.g., sensor interface). | Select when cost sensitivity outweighs safety certification needs and speed requirements are ≤10 Mbps. |
| SI8621ED-IS | Capacitive isolation, 5 kVRMS rating, 100 Mbps, but default-low output and no VDE 0884-17 certification. | Lacks reinforced insulation validation for medical 2-MOPP; requires external filtering for EMI-sensitive environments. | Prefer for high-volume consumer applications where UL-only approval suffices and default-low logic aligns with system architecture. |
Compared with ADuM2281CRIZ, ADuM2201ARWZ sacrifices isolation robustness and DC correctness for lower cost, while SI8621ED-IS trades VDE-certified reinforced insulation and default-high safety for capacitive-isolator integration density - making ADuM2281CRIZ uniquely suited for certified industrial and medical isolation where both performance and regulatory compliance are mandatory.
Availability
ADuM2281CRIZ is available at Aetrix Electronics and suitable for industrial motor drives, medical patient monitoring systems, and isolated RS-485 transceiver designs requiring stable component supply, long-term lifecycle support, and certified reinforced insulation.
Supply support for ADuM2281CRIZ 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 healthcare markets.
The ADuM228x family was designed specifically for high-reliability, safety-certified digital isolation in harsh environments - emphasizing low propagation delay, ultra-high CMTI, and guaranteed DC correctness without input activity.
FAQ
What is the default output state of ADuM2281CRIZ during power-up or input-side undervoltage?
ADuM2281CRIZ has a default-high output configuration: when VDD1 is unpowered or below UVLO threshold (2.4 V), both VOA and VOB assert logic high after a maximum 1.6 µs refresh period. This behavior is confirmed in Table 23 (ADuM2281 Truth Table) and ensures fail-safe operation in control-enable or reset circuits. The ADuM2281CRIZ maintains this state until valid input transitions occur or VDD1 stabilizes above 2.6 V.
Does ADuM2281CRIZ support mixed-voltage operation, and what are the valid combinations?
Yes, ADuM2281CRIZ supports mixed-voltage operation across its isolation barrier: VDD1 and VDD2 may each independently operate from 3.0 V to 5.5 V. Valid combinations include 5 V/3.3 V, 3.3 V/5 V, 5 V/5 V, and 3.3 V/3.3 V - all specified in Tables 7–12 of the datasheet. This enables seamless level translation between legacy 5 V controllers and modern 3.3 V FPGAs without external level shifters, and the ADuM2281CRIZ maintains full 100 Mbps data rate and timing specs across all combinations.
What safety certifications does ADuM2281CRIZ hold, and which standards do they cover?
ADuM2281CRIZ is certified to UL 1577 (5000 VRMS), IEC/CSA 62368-1, IEC/CSA 61010-1, IEC/CSA 60601-1 (2 MOPP), CQC GB 4943.1, and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. These approvals validate its use in medical equipment (IEC 60601-1), test & measurement (IEC 61010-1), and industrial power systems (IEC 62368-1). The ADuM2281CRIZ achieves VIORM = 645 VPEAK per VDE 0884-17, enabling compact PCB layouts meeting creepage/clearance requirements without additional barriers.
How does the refresh circuitry in ADuM2281CRIZ ensure DC correctness without input toggling?
The ADuM2281CRIZ incorporates patented refresh circuitry that periodically samples and retransmits the last valid input state across the isolation barrier - even when inputs are static. With a maximum refresh period of 1.6 µs (Table 4, 6, 9, 12), it guarantees continuous DC output fidelity without requiring external clocking or input activity. This feature distinguishes ADuM2281CRIZ from optocouplers and basic capacitive isolators, and is essential for maintaining safe states in enable, fault, or watchdog signals where input transitions may be infrequent or absent.
What is the maximum common-mode transient immunity (CMTI) specification for ADuM2281CRIZ, and how is it measured?
ADuM2281CRIZ specifies >25 kV/μs common-mode transient immunity (CMTI), tested per Table 3/4/6/9/12 with VCM = 1000 V, transient magnitude = 800 V, and VIx = VDDx. This value represents the maximum slew rate the isolation barrier can sustain while maintaining VO > 0.8×VDDx - ensuring reliable operation in high-noise environments like motor drives and switch-mode power supplies. The ADuM2281CRIZ achieves this via monolithic transformer coupling and proprietary noise rejection circuitry, outperforming typical optocouplers (<15 kV/μs) and many competing digital isolators.
ADUM2281CRIZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 5000Vrms
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADUM2281CRIZ FAQ
1.How can I place an order for ADUM2281CRIZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM2281CRIZ 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 ADUM2281CRIZ reliable?
The price and inventory of ADUM2281CRIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM2281CRIZ is usually 5 days.
3.What payment methods are accepted for ADUM2281CRIZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM2281CRIZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM2281CRIZ?
ADUM2281CRIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM2281CRIZ 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 ADUM2281CRIZ?
For technical support, including ADUM2281CRIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM2281CRIZ requirements.
6.How does Aetrix verify that ADUM2281CRIZ is sourced from the original manufacturer or authorized distributors?
All ADUM2281CRIZ 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 ADUM2281CRIZ meets industry standards.
7.What is the process for return or replacement of ADUM2281CRIZ?
All ADUM2281CRIZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM2281CRIZ, 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 ADUM2281CRIZ part is unused and in its original packaging.
Return procedure for ADUM2281CRIZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM2281CRIZ Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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