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Analog Devices Inc. ADUM2281ARIZ-RL
- Part No.:
- ADUM2281ARIZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADUM2281ARIZ-RL.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:341
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Product details
Overview
ADUM2281ARIZ-RL from Analog Devices is a 5 kVRMS dual-channel digital isolator using iCoupler® transformer-based technology, providing bidirectional signal isolation between two independent 3 V–5.5 V domains. It delivers up to 100 Mbps data rate, 24 ns max propagation delay, and default-high output logic state on both channels. It is used in isolated RS-485 transceivers and medical power supply feedback loops where high common-mode transient immunity (>25 kV/μs) and reinforced insulation (645 VPEAK) are required.
For engineers reviewing the ADUM2281ARIZ-RL datasheet, ADUM2281ARIZ-RL pinout, ADUM2281ARIZ-RL application, or ADUM2281ARIZ-RL equivalent, this page provides verified technical context, exact pin functions, safety-certified insulation parameters, and validated alternative options for industrial and medical isolation designs.
Technical Context
The ADUM2281ARIZ-RL implements monolithic air-core transformers per channel with integrated CMOS interface circuitry, enabling galvanic isolation without optocoupler aging or LED drive complexity. Its patented refresh circuit maintains DC-correct output states during input inactivity, eliminating the need for external watchdog or refresh signals.
It supports asymmetric supply operation (e.g., 5 V on Side 1, 3 V on Side 2), provides level translation across the barrier, and features undervoltage lockout (2.4 V–2.6 V thresholds) on both sides. Channel-to-channel matching is ≤5 ns (C grade), and pulse width distortion is ≤2 ns - critical for timing-sensitive serial interfaces like SPI and isolated UART.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS for 1 minute - meets UL 1577 and reinforced insulation requirements per IEC 60747-17 (VDE 0884-17) |
| Data Rate | Up to 100 Mbps - supports high-speed isolated communication in motor drives and PLC backplanes |
| Propagation Delay | ≤24 ns maximum - enables sub-40 ns round-trip latency in closed-loop isolated feedback paths |
| Common-Mode Transient Immunity | >25 kV/μs - sustains reliable operation in noisy industrial environments with fast-switching power stages |
| Supply Voltage Range | 3.0 V to 5.5 V per side - allows interoperability between legacy 5 V and modern low-voltage MCU domains |
| Default Output State | High on both outputs when unpowered - ensures fail-safe high-level signaling in power-loss scenarios |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control cabinet deployment |
Pinout & Package
ADUM2281ARIZ-RL is housed in a 16-lead SOIC wide-body package (7.5 mm creepage/clearance) with enhanced insulation spacing. Pin 1–8 form the input-side domain (Side 1); pins 9–16 form the output-side domain (Side 2). Pins marked NC have no internal connection and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, GND1 | Input-side ground reference | Provides return path for Side 1 logic; must be connected to local input-domain ground plane |
| 3, VDD1 | Input-side supply voltage | Accepts 3.0–5.5 V; powers input receiver and transformer driver circuitry |
| 4, VOA | Output A (from Side 1) | Isolated output channel A - driven by input VIA; default-high when unpowered |
| 5, VIB | Input B (to Side 1) | Logic input channel B on Side 1; referenced to GND1 and VDD1 |
| 12, VOB | Output B (from Side 1) | Isolated output channel B - driven by input VIB; default-high when unpowered |
| 13, VIA | Input A (to Side 1) | Logic input channel A on Side 1; referenced to GND1 and VDD1 |
| 14, VDD2 | Output-side supply voltage | Accepts 3.0–5.5 V; powers output buffer and transformer receiver |
| 9, 16, GND2 | Output-side ground reference | Provides return path for Side 2 logic; must be connected to isolated output-domain ground |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel configuration | Each channel operates independently in either direction - eliminates need for separate transmit/receive isolators in full-duplex links |
| Patented refresh circuit | Maintains correct DC output level indefinitely without input toggling - essential for static control signals and safety interlocks |
| Reinforced insulation certification | VIORM = 645 VPEAK, VIOWM = 456 VRMS - satisfies 2 MOPP requirements for medical equipment per IEC 60601-1 |
| Low dynamic power consumption | IDDI(D) = 0.09 mA/Mbps, IDDO(D) = 0.04 mA/Mbps - reduces thermal load in dense PCB layouts |
| Pin compatibility | Matches ADuM2201/ADuM2211 footprints - enables drop-in replacement in existing designs without layout change |
Applications
| Industrial Motor Drive | Medical Power Supply Feedback |
|---|---|
Use Scenario: Isolating gate driver enable and fault signals between MCU and high-voltage IGBT half-bridge. IC Role / Device Role / Timing Role: Dual-channel digital isolator providing timing-aligned, noise-immune signal transfer across 1200 V DC bus. Use Value: 24 ns max propagation delay and 5 ns channel matching preserve PWM dead-time integrity; >25 kV/μs CMTI prevents false triggering during switching transients. |
Use Scenario: Transmitting isolated voltage and current sense data from secondary-side controller to primary-side MCU in Class II medical AC/DC supplies. IC Role / Device Role / Timing Role: Reinforced-isolation barrier for analog-to-digital interface signals requiring 2 MOPP compliance. Use Value: 645 VPEAK VIORM and IEC 60601-1 certification ensure patient safety; default-high outputs prevent unsafe default states during brownout. |
| Isolated RS-485 Transceiver | PLC Digital I/O Module |
Use Scenario: Galvanically isolating UART lines between microcontroller and RS-485 transceiver in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional signal isolator enabling full-duplex communication at up to 100 Mbps while blocking ground loops. Use Value: 3 V–5.5 V dual-supply flexibility allows direct interfacing with 3.3 V MCUs and 5 V transceivers; 8.7 mm creepage meets IEC 61000-4-5 surge requirements. |
Use Scenario: Isolating digital input/output signals between field-side sensors/actuators and backplane CPU in modular PLC chassis. IC Role / Device Role / Timing Role: Dual-channel isolator handling discrete status and command signals with deterministic latency. Use Value: −40°C to +125°C operation supports extended temperature range deployment; low quiescent current (<2.6 mA per side at 1 Mbps) minimizes module power budget. |
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 |
|---|---|---|---|
| ADUM2281BRIZ-RL | Same pinout and function; tighter propagation delay skew (≤12 ns vs. ≤16 ns) and lower PWD (≤2 ns vs. ≤2.5 ns) - B grade vs. A grade | Preferred for timing-critical SPI isolation where channel matching <12 ns is required | Select when design requires guaranteed ≤12 ns channel-to-channel skew over full temperature range |
| SI8621ED-B-IS | Capacitive isolation; 5 kVRMS rating; 150 Mbps max data rate; different pinout (SOIC-8); no default-high output behavior | Suitable for higher-speed links but lacks fail-safe default output and medical 2-MOPP certification | Choose only if speed >100 Mbps is mandatory and regulatory compliance permits capacitive-only isolation |
Compared with ADUM2281ARIZ-RL, ADUM2281BRIZ-RL offers tighter timing specs for precision control loops, while SI8621ED-B-IS trades default-state safety and medical certification for higher bandwidth and smaller footprint - neither is pin-compatible, and both require board redesign.
Availability
ADUM2281ARIZ-RL is available at Aetrix Electronics and suitable for industrial motor drives, medical power supplies, and isolated communications requiring stable component supply, long-term lifecycle support, and certified reinforced insulation.
Supply support for ADUM2281ARIZ-RL 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 ADuM228x family was designed specifically for high-reliability, safety-critical isolation in medical, industrial, and energy infrastructure systems - emphasizing reinforced insulation, fail-safe defaults, and robust CMTI performance.
FAQ
What is the default output state of ADUM2281ARIZ-RL when power is not applied?
ADUM2281ARIZ-RL has a default-high output state on both channels (VOA and VOB) when either VDD1 or VDD2 is unpowered. This behavior is intrinsic to the ADuM2281/ADuM2286 variant and ensures fail-safe signaling in brownout or startup conditions. The output returns to the input state within 1.6 µs after power restoration, as confirmed in the truth table and functional description sections of the Rev. D datasheet.
Does ADUM2281ARIZ-RL support mixed-voltage operation between 3 V and 5 V domains?
Yes, ADUM2281ARIZ-RL supports mixed-voltage operation: it can operate with VDD1 = 5 V and VDD2 = 3 V, or vice versa, while maintaining full 100 Mbps capability (C grade) and specified timing performance. Electrical characteristics tables for mixed 5 V/3 V and 3 V/5 V operation are explicitly provided in the datasheet (Tables 7–12), confirming interoperability and level translation across the isolation barrier.
What safety certifications does ADUM2281ARIZ-RL hold?
ADUM2281ARIZ-RL 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) with VIORM = 645 VPEAK. These approvals are documented in Table 14 of the Rev. D datasheet and apply directly to the ADUM2281ARIZ-RL variant as part of the ADuM228x family.
Is ADUM2281ARIZ-RL pin-compatible with earlier ADuM220x or ADuM221x isolators?
Yes, ADUM2281ARIZ-RL is pin-compatible with ADuM2201 and ADuM2211, as confirmed in Figure 2 and the Functional Block Diagrams section of the datasheet. This allows direct replacement in existing designs without PCB modification. However, note that ADuM2281ARIZ-RL adds improved CMTI (>25 kV/μs), tighter propagation delay, and updated safety certifications compared to those legacy families.
What is the maximum continuous working voltage for ADUM2281ARIZ-RL?
The maximum continuous working voltage for ADUM2281ARIZ-RL is 456 VRMS (VIOWM) for reinforced insulation, as specified in Table 19 of the Rev. D datasheet. This value applies to bipolar AC waveforms and is derived from the VIORM = 645 VPEAK rating per DIN EN IEC 60747-17 (VDE 0884-17), ensuring long-term reliability under sustained voltage stress across the isolation barrier.
ADUM2281ARIZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 5000Vrms
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC-IC
ADUM2281ARIZ-RL FAQ
1.How can I place an order for ADUM2281ARIZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM2281ARIZ-RL 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 ADUM2281ARIZ-RL reliable?
The price and inventory of ADUM2281ARIZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM2281ARIZ-RL is usually 5 days.
3.What payment methods are accepted for ADUM2281ARIZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM2281ARIZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM2281ARIZ-RL?
ADUM2281ARIZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM2281ARIZ-RL 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 ADUM2281ARIZ-RL?
For technical support, including ADUM2281ARIZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM2281ARIZ-RL requirements.
6.How does Aetrix verify that ADUM2281ARIZ-RL is sourced from the original manufacturer or authorized distributors?
All ADUM2281ARIZ-RL 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 ADUM2281ARIZ-RL meets industry standards.
7.What is the process for return or replacement of ADUM2281ARIZ-RL?
All ADUM2281ARIZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADUM2281ARIZ-RL, 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 ADUM2281ARIZ-RL part is unused and in its original packaging.
Return procedure for ADUM2281ARIZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM2281ARIZ-RL Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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