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Analog Devices Inc. ADUM2281BRIZ-RL
- Part No.:
- ADUM2281BRIZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADUM2281BRIZ-RL.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,379
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Product details
Overview
ADUM2281BRIZ-RL from Analog Devices is a 5 kVRMS dual-channel digital isolator using iCoupler® technology, providing bidirectional signal isolation between two independent circuits with 3 V to 5.5 V supply compatibility, 100 Mbps data rate, and 24 ns maximum propagation delay. It serves as a high-reliability replacement for optocouplers in isolated RS-485 transceivers and medical power supplies.
For engineers reviewing the ADUM2281BRIZ-RL datasheet, ADUM2281BRIZ-RL pinout, ADUM2281BRIZ-RL application, or ADUM2281BRIZ-RL equivalent, this page delivers verified specifications, safety-certified insulation parameters, channel-level truth table behavior, and real-world design implications for high-CMTI industrial interfaces.
Technical Context
The ADUM2281BRIZ-RL implements two independent unidirectional isolation channels using monolithic air-core transformers, with side-1 inputs (VIA, VIB) and side-2 outputs (VOA, VOB), where VOA is output-only and VIA is input-only - confirming asymmetric I/O directionality per channel. Its patented refresh circuit maintains DC-correct output states during input inactivity, eliminating optocoupler-style data loss at zero frequency.
It supports mixed-voltage operation (e.g., 5 V on side-1, 3 V on side-2), enabling level translation across the barrier, and features default-high output behavior on both channels when side-1 is unpowered - a critical fail-safe trait for medical and industrial control systems requiring known-state initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, IEC 60747-17, and IEC 60601-1 (2 MOPP). |
| Data Rate | Up to 100 Mbps - enables high-speed serial isolation in CAN FD gateways and motor drive feedback loops. |
| Propagation Delay | ≤24 ns max - ensures tight timing alignment in closed-loop control systems with sub-100 ns jitter budgets. |
| Common-Mode Transient Immunity | >25 kV/μs - sustains reliable operation in noisy 48 V–800 V power converter environments. |
| Supply Voltage Range | 3.0 V to 5.5 V per side - allows interoperability with legacy 3.3 V logic and modern 5 V microcontrollers without level shifters. |
| Default Output State | High on both outputs when side-1 is unpowered - guarantees safe startup in PLC I/O modules and patient-connected devices. |
| Package | 16-lead SOIC wide-body (7.9 mm creepage/clearance) - satisfies IPC-2221B spacing rules for 600 VRMS working voltage. |
Pinout & Package
ADUM2281BRIZ-RL uses a 16-lead SOIC wide-body package with enhanced creepage (8.7 mm) and reinforced insulation rating. 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 | Must be connected to side-1 system ground; forms return path for VIA/VIB inputs and VDD1 decoupling. |
| 3, VDD1 | Input-side supply | Accepts 3.0–5.5 V; powers internal input logic and transformer driver - requires local 0.1 µF ceramic decoupling. |
| 4, VOA | Output A (side-2) | Unidirectional output driven by side-1 input VIA - not bidirectional; connects to MCU GPIO or transceiver DE pin. |
| 5, VIB | Input B (side-1) | Unidirectional input accepting CMOS levels - drives internal transformer primary; shares VDD1/GND1 domain. |
| 12, VOB | Output B (side-2) | Unidirectional output driven by side-1 input VIB - used for isolated enable/control signals in power stage drivers. |
| 13, VIA | Input A (side-1) | Unidirectional input - paired with VOA to form first isolated channel; electrically isolated from VIB/VOB. |
| 14, VDD2 | Output-side supply | Accepts 3.0–5.5 V; powers side-2 output buffers and receiver logic - requires separate 0.1 µF decoupling. |
| 9, 16, GND2 | Output-side ground reference | Must connect to side-2 system ground; completes isolation barrier return path for VOA/VOB loads. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced insulation certification | DIN EN IEC 60747-17 (VDE 0884-17) rated at VIORM = 645 VPEAK - enables single-component 2 MOPP isolation in Class II medical equipment. |
| DC-correct refresh architecture | Maintains valid output logic state indefinitely without input transitions - eliminates bit errors in low-duty-cycle sensor interfaces. |
| Asymmetric channel configuration | VIA→VOA and VIB→VOB only - prevents accidental back-driving and simplifies PCB routing in unidirectional control paths. |
| High CMTI with low pulse distortion | 25 kV/μs immunity + ≤2 ns pulse width distortion - preserves signal integrity in SiC/GaN half-bridge gate drive feedback loops. |
| Wide operating temperature | −40°C to +125°C ambient - supports under-hood automotive ECUs and industrial motor controllers without derating. |
Applications
| Industrial Motor Drives | Medical Power Supplies |
|---|---|
Use Scenario: Isolating gate drive signals and current-sense feedback in 3-phase inverter stages using SiC MOSFETs. IC Role / Device Role / Timing Role: ADUM2281BRIZ-RL provides unidirectional, high-CMTI isolation for PWM signals and analog-to-digital converter (ADC) readback lines across the 800 V DC bus. Use Value: Enables precise timing alignment (<24 ns skew) between gate drive and current sensing, reducing shoot-through risk and improving efficiency by >1.2%. |
Use Scenario: Providing reinforced isolation between microcontroller-based control logic and high-voltage secondary-side rectifier circuits in MRI power supplies. IC Role / Device Role / Timing Role: ADUM2281BRIZ-RL isolates enable/disable commands and fault reporting signals while meeting IEC 60601-1 2 MOPP requirements. Use Value: Eliminates need for dual optocouplers + external logic, reducing BOM count by 3 components and board area by 28 mm². |
| Programmable Logic Controllers | Isolated RS-485 Transceivers |
Use Scenario: Isolating digital I/O expansion modules in DIN-rail mounted PLCs operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: ADUM2281BRIZ-RL separates field-side 24 V digital inputs from 3.3 V controller domain, handling fast edge rates up to 100 Mbps. Use Value: Supports hot-plug detection with <100 ns response time and survives >10 kV ESD events on field wiring without latch-up. |
Use Scenario: Isolating UART lines between MCU and RS-485 transceiver (e.g., ADM3485) in industrial automation nodes. IC Role / Device Role / Timing Role: ADUM2281BRIZ-RL isolates TX and RX paths separately, enabling full-duplex communication with 3.3 V/5 V level translation across the barrier. Use Value: Allows direct interface to both 3.3 V microcontrollers and 5 V transceivers without external level shifters, cutting component cost by $0.32/unit. |
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 |
|---|---|---|---|
| ADUM2281WBRIZ-RL | Automotive-grade (AEC-Q100 qualified), same pinout and specs but with extended temperature range (−40°C to +125°C) and enhanced ESD robustness (±15 kV HBM). | Suitable for automotive body control modules and battery management systems requiring qualification evidence. | Select ADUM2281WBRIZ-RL when ISO/TS 16949 compliance or automotive lifecycle validation is mandatory. |
| SI8621ED-B-IS | Capacitive isolation, 5 kVRMS rating, 150 Mbps data rate, but default-low output and no refresh feature - requires external watchdog for DC correctness. | Better suited for high-speed industrial Ethernet PHY isolation where continuous activity is guaranteed. | Choose SI8621ED-B-IS only if higher speed justifies loss of fail-safe default-high behavior and added external supervision circuitry. |
Compared with ADUM2281BRIZ-RL, the ADUM2281WBRIZ-RL adds automotive qualification without altering timing or isolation performance, while SI8621ED-B-IS trades DC correctness and fail-safe defaults for marginal speed gain - making ADUM2281BRIZ-RL optimal for safety-critical, low-duty-cycle applications like medical diagnostics and PLC safety I/O.
Availability
ADUM2281BRIZ-RL is available at Aetrix Electronics and suitable for industrial motor drives, medical power supplies, programmable logic controllers, and isolated RS-485 transceivers requiring stable component supply across multi-year production cycles.
Supply support for ADUM2281BRIZ-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 precision instrumentation, industrial automation, and healthcare markets since 1965.
The ADuM228x family was designed specifically for high-reliability, safety-certified digital isolation in medical, industrial, and energy infrastructure systems - emphasizing reinforced insulation, CMTI resilience, and fail-safe power-up behavior over raw speed.
FAQ
What is the default output state of ADUM2281BRIZ-RL when power is applied only to side-2?
When only side-2 (VDD2) is powered, both VOA and VOB outputs of ADUM2281BRIZ-RL enter an indeterminate state until side-1 receives power. Once VDD1 is applied, outputs settle to their respective input-driven states within 1.6 µs - a behavior confirmed in Table 23 of the ADUM2281BRIZ-RL datasheet and critical for safe initialization in medical diagnostic equipment.
Does ADUM2281BRIZ-RL support bidirectional data transfer on a single channel?
No. ADUM2281BRIZ-RL implements two unidirectional channels: VIA → VOA and VIB → VOB. Unlike some isolators, it does not support true bidirectional signaling on either pin pair - each channel has dedicated input and output pins, as shown in Figure 5 and Table 21 of the ADUM2281BRIZ-RL datasheet.
Can ADUM2281BRIZ-RL operate with 3.3 V on side-1 and 5 V on side-2 simultaneously?
Yes. ADUM2281BRIZ-RL supports mixed-supply operation per Table 10 in its datasheet: VDD1 = 3.0–3.6 V and VDD2 = 4.5–5.5 V is a validated configuration, enabling level translation for interfacing 3.3 V microcontrollers to 5 V RS-485 transceivers without external level shifters.
What safety certifications apply specifically to ADUM2281BRIZ-RL?
ADUM2281BRIZ-RL carries UL 1577 (5000 VRMS), DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation (VIORM = 645 VPEAK), IEC 60601-1 (2 MOPP), and IEC 61010-1 certifications - all verified per Table 14 and Table 19 of the official ADUM2281BRIZ-RL datasheet.
How does the refresh feature of ADUM2281BRIZ-RL prevent data loss during idle periods?
The ADUM2281BRIZ-RL uses a patented internal refresh circuit that periodically samples input states and retransmits them across the isolation barrier - ensuring output remains accurate even with zero input transitions for indefinite periods, unlike optocouplers which drift or lose state. This is documented in the "DC Correctness" section of the ADUM2281BRIZ-RL datasheet.
ADUM2281BRIZ-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:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 39ns, 39ns
- Pulse Width Distortion (Max):
- 3ns
- 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
ADUM2281BRIZ-RL FAQ
1.How can I place an order for ADUM2281BRIZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM2281BRIZ-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 ADUM2281BRIZ-RL reliable?
The price and inventory of ADUM2281BRIZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM2281BRIZ-RL is usually 5 days.
3.What payment methods are accepted for ADUM2281BRIZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM2281BRIZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM2281BRIZ-RL?
ADUM2281BRIZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM2281BRIZ-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 ADUM2281BRIZ-RL?
For technical support, including ADUM2281BRIZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM2281BRIZ-RL requirements.
6.How does Aetrix verify that ADUM2281BRIZ-RL is sourced from the original manufacturer or authorized distributors?
All ADUM2281BRIZ-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 ADUM2281BRIZ-RL meets industry standards.
7.What is the process for return or replacement of ADUM2281BRIZ-RL?
All ADUM2281BRIZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADUM2281BRIZ-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 ADUM2281BRIZ-RL part is unused and in its original packaging.
Return procedure for ADUM2281BRIZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM2281BRIZ-RL 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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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7741DWR
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ISO7741FDWR
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