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Analog Devices Inc. ADUM3481ARSZ
- Part No.:
- ADUM3481ARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3481ARSZ.pdf
- Description:
- DGTL ISO 3750VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:885
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Product details
Overview
ADUM3481ARSZ from Analog Devices is a quad-channel digital isolator using iCoupler® transformer-based isolation, providing 3.75 kVRMS reinforced insulation, 25 Mbps data rate, and 25 ns typical propagation delay. It supports 1.8 V to 5.5 V I/O voltage translation across two independent supply domains (VDDL1/VDD1 and VDDL2/VDD2), with output default level selection via CTRL1/CTRL2 pins. It is used in SPI isolation for industrial PLCs where high common-mode transient immunity (>25 kV/µs) and operation up to 125°C are required.
For engineers reviewing the ADUM3481ARSZ datasheet, ADUM3481ARSZ pinout, ADUM3481ARSZ application, or ADUM3481ARSZ equivalent, this page delivers verified specifications, functional pin mapping, real-world use cases in fieldbus and data converter interfaces, and validated alternative options aligned with safety certifications including UL 1577, VDE 0884-17, and IEC 62368-1.
Technical Context
The ADUM3481ARSZ implements four unidirectional isolated channels with asymmetric configuration: three inputs (A, B, C) on Side 1 and one input (D) on Side 2, paired with corresponding outputs (A–D) distributed across both sides. Its dual-supply architecture separates core logic (3.0–5.5 V) from I/O interface rails (1.8–5.5 V), enabling level-shifting without external translators.
It integrates monolithic air-core transformers for signal coupling, delivering low pulse width distortion (≤3 ns typical), high CMTI (>25 kV/µs), and guaranteed DC correctness. The device includes dedicated CTRL pins for configurable output default states-critical for fail-safe behavior during power-up or fault conditions in motor control and energy metering systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 25 Mbps (NRZ) - supports high-speed SPI clock rates up to 12.5 MHz with margin. |
| Isolation Rating | 3.75 kVRMS for 1 minute - meets reinforced insulation requirements per UL 1577 and VDE 0884-17. |
| Propagation Delay | 25 ns typical - enables tight timing budgets in real-time industrial communication links. |
| Common-Mode Transient Immunity | >25 kV/µs - maintains signal integrity in noisy motor drive or power supply environments. |
| Supply Range | VDDLx: 1.8–5.5 V; VDDx: 3.0–5.5 V - allows direct interfacing with 1.8 V logic and 3.3/5 V microcontrollers. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions. |
| Regulatory Approvals | UL 1577, VDE 0884-17, IEC 62368-1, IEC 61010-1 - certified for safety-critical end equipment. |
Pinout & Package
ADUM3481ARSZ uses a 20-lead, RoHS-compliant SSOP package (5.3 mm × 7.2 mm, 0.65 mm pitch). Pin layout follows the ADuM3481 functional configuration with side-split power and control terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | VDDL1 / VDDL2 | I/O supply rails (1.8–5.5 V) for Side 1 and Side 2 logic interfaces; bypassed externally with 0.01–0.1 µF ceramic capacitors. |
| 2, 10, 11, 19 | GND1 / GND2 | Separate ground references for isolated sides; Pins 2/10 and 11/19 are internally shorted - both must connect to respective PCB ground planes. |
| 3–5, 15 | VIA, VIB, VIC, VID | Logic inputs: A/B/C on Side 1; D on Side 2 - support CMOS-compatible thresholds (VIH = 0.7×VDDLx). |
| 6, 16–18 | VOD, VOC, VOB, VOA | Logic outputs: D on Side 1; C/B/A on Side 2 - drive loads up to ±4 mA with VOH ≥ VDDLx − 0.4 V. |
| 7, 14 | CTRL1 / CTRL2 | Side 1 and Side 2 output default select: logic high → default high; logic low → default low - ensures safe state at power-up. |
| 8, 13 | VDD1 / VDD2 | Core supply rails (3.0–5.5 V) powering internal isolator circuitry; decoupling required. |
| 9, 12 | VDDC1 / VDDC2 | Internal regulator outputs - not for external load; bypassed to respective GND with 0.01–0.1 µF capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | 3.75 kVRMS withstand, VIORM = 560 Vpeak, certified to VDE 0884-17 - eliminates need for external creepage/clearance management. |
| Configurable Output Default | Dedicated CTRL1/CTRL2 pins set fail-safe output state during power loss or reset - critical for gate driver enable/disable sequencing. |
| Wide I/O Voltage Range | 1.8 V to 5.5 V I/O supply compatibility - interfaces directly with low-voltage FPGAs and legacy 5 V MCUs without level shifters. |
| High-Temperature Operation | Guaranteed performance from −40°C to +125°C - suitable for enclosed industrial drives and EV charging controllers. |
| Low Power at High Speed | 2.8 mA IDD1 (typ) at 25 Mbps with 5 V supplies - reduces thermal load in dense PCB layouts with multiple isolators. |
Applications
| Industrial Fieldbus Isolation | SPI Interface Isolation |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in programmable logic controllers to prevent ground loop noise and fault propagation between controller and field devices. IC Role / Device Role / Timing Role: Quad-channel isolator separating control-side logic (Side 1) from bus-side transceiver signals (Side 2), with CTRL2 configuring transceiver enable default state. Use Value: Enables reliable 25 Mbps half-duplex communication while maintaining >25 kV/µs CMTI and 3.75 kVRMS barrier integrity across harsh factory floors. |
Use Scenario: Isolating SPI lines between an MCU and isolated ADC/DAC in energy metering systems requiring reinforced insulation per IEC 62053. IC Role / Device Role / Timing Role: Provides independent isolation for SCLK, MOSI, MISO, and CS signals - three inputs on Side 1 (MCU side), one output on Side 2 (ADC side) per ADUM3481 pinout. Use Value: Maintains sub-100 ns timing skew across all four channels, preserving SPI setup/hold margins at 10+ MHz clock rates. |
| Motor Drive Gate Driver Interface | Medical Sensor Data Acquisition |
|
Use Scenario: Isolating PWM and fault feedback signals between a DSP and IGBT gate driver stage in servo inverters. IC Role / Device Role / Timing Role: Transmits three PWM inputs (A/B/C) from controller to gate driver (Side 1 → Side 2), while returning one fault signal (D) from driver to controller (Side 2 → Side 1). Use Value: 25 ns propagation delay and <3 ns pulse width distortion ensure precise edge alignment for dead-time control and overcurrent response. |
Use Scenario: Isolating analog front-end sensor signals and control lines in portable ECG monitors requiring patient-connected (CF-rated) isolation. IC Role / Device Role / Timing Role: Separates low-noise analog acquisition circuitry (Side 2) from digital processing unit (Side 1), with CTRL1 ensuring ADC ready line defaults low during boot. Use Value: Reinforced insulation rating (VIOWM = 396 VRMS) and CTI >600 V meet IEC 60601-1 creepage requirements without additional spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3482ARSZ | Same package and isolation specs; channel directionality differs - two inputs + two outputs per side vs. ADUM3481ARSZ's 3-in/1-out + 1-in/3-out split. | Better suited for bidirectional protocols like I²C or dual-SPI buses where symmetric channel usage is needed. | Select ADUM3482ARSZ when balanced input/output distribution across both sides is required; ADUM3481ARSZ remains optimal for asymmetric control/data flow. |
| SI8641ED-IS | Capacitive isolation; 5 kVRMS rating; 150 Mbps max; no integrated output default control pins. | Lacks hardware-configurable output default state - requires external pull resistors or firmware handling for fail-safe behavior. | Choose SI8641ED-IS only if higher speed or lower propagation delay (<10 ns) is prioritized over integrated safety features and qualification for medical/industrial standards. |
Compared with ADUM3481ARSZ, ADUM3482ARSZ offers identical safety certification and packaging but reassigns channel directionality for symmetric use, while SI8641ED-IS trades default-state control and regulatory alignment for raw speed - making ADUM3481ARSZ the preferred choice for safety-critical, asymmetric isolation tasks.
Availability
ADUM3481ARSZ is available at Aetrix Electronics and suitable for industrial fieldbus isolation, SPI interface protection, and motor drive gate driver interfaces requiring stable component supply, long-term lifecycle assurance, and full regulatory compliance documentation.
Supply support for ADUM3481ARSZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The ADuM348x family was designed specifically for robust, certified digital isolation in industrial automation, energy infrastructure, and medical systems - emphasizing safety compliance, wide temperature operation, and flexible I/O voltage translation.
FAQ
What is the maximum data rate supported by ADUM3481ARSZ?
ADUM3481ARSZ supports up to 25 Mbps in NRZ format, verified across all operating voltages (1.8 V, 3.0 V, and 5.0 V I/O) and temperatures (−40°C to +125°C). This rating applies to both directional channel configurations and is specified with CL = 15 pF loading and CMOS-level signals per the Rev. B datasheet Table 1–4.
Does ADUM3481ARSZ require external level shifters when interfacing 1.8 V and 5 V logic?
No. ADUM3481ARSZ natively supports 1.8 V to 5.5 V I/O voltage translation via separate VDDL1/VDDL2 rails. For example, Side 1 can operate at 1.8 V I/O (VDDL1 = 1.8 V) while Side 2 runs at 5 V (VDDL2 = 5 V), with internal circuitry maintaining signal integrity - eliminating external level shifters in mixed-voltage systems.
How does the CTRL1 and CTRL2 pin affect ADUM3481ARSZ behavior during power-up?
The CTRL1 and CTRL2 pins determine the default output state of their respective sides when input signals are invalid or absent. With CTRLx held low, outputs on that side default low; with CTRLx high, they default high. This ensures predictable, fail-safe behavior during power sequencing - a key requirement in ADUM3481ARSZ deployments such as motor enable lines or ADC ready signals.
What safety certifications apply to ADUM3481ARSZ?
ADUM3481ARSZ is certified to UL 1577 (3750 VRMS for 1 min), DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 560 Vpeak), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1. These approvals are production-tested and marked with the * symbol on the package per Analog Devices' Rev. B datasheet Section "Regulatory Approvals".
Can ADUM3481ARSZ be used in a single-supply configuration?
Yes. When the I/O voltage range overlaps with the core supply (e.g., VDDL1 = VDD1 = 3.3 V), the VDDL1 and VDD1 pins may be tied together - same for VDDL2 and VDD2 - enabling single-supply operation per the "General Description" section of the ADUM3481ARSZ datasheet. Decoupling capacitors remain mandatory on each combined rail.
ADUM3481ARSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 90ns, 90ns
- Pulse Width Distortion (Max):
- 6ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 1.8V ~ 5.5V, 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
ADUM3481ARSZ FAQ
1.How can I place an order for ADUM3481ARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3481ARSZ 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 ADUM3481ARSZ reliable?
The price and inventory of ADUM3481ARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3481ARSZ is usually 5 days.
3.What payment methods are accepted for ADUM3481ARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3481ARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3481ARSZ?
ADUM3481ARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3481ARSZ 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 ADUM3481ARSZ?
For technical support, including ADUM3481ARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3481ARSZ requirements.
6.How does Aetrix verify that ADUM3481ARSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3481ARSZ 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 ADUM3481ARSZ meets industry standards.
7.What is the process for return or replacement of ADUM3481ARSZ?
All ADUM3481ARSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3481ARSZ, 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 ADUM3481ARSZ part is unused and in its original packaging.
Return procedure for ADUM3481ARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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