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Analog Devices Inc. ADUM3481BRSZ
- Part No.:
- ADUM3481BRSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3481BRSZ.pdf
- Description:
- DGTL ISO 3750VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:467
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Product details
Overview
ADUM3481BRSZ 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 features independent 1.8 V–5.5 V I/O supply rails per side, output default selection via CTRL pins, and operates up to +125°C in industrial environments - used for SPI isolation between microcontrollers and isolated ADCs in motor drives.
For engineers reviewing the ADUM3481BRSZ datasheet, ADUM3481BRSZ pinout, ADUM3481BRSZ application, or ADUM3481BRSZ equivalent, key selection criteria include channel direction configuration (2/2 bidirectional), VIORM = 560 Vpeak, DIN EN IEC 60747-17 (VDE 0884-17) reinforced certification, and SSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The ADUM3481BRSZ implements four independent isolation channels using monolithic air-core transformers, with separate core (3.0–5.5 V) and I/O (1.8–5.5 V) supplies on each side. Its architecture supports asymmetric voltage translation - e.g., 1.8 V logic on one side interfacing with 5 V logic on the other - without level-shifter components.
It integrates dual output-default control inputs (CTRL1 on Side 1, CTRL2 on Side 2), enabling fail-safe low/high output states during power-up or signal loss. Propagation delay skew is specified at ≤17 ns (B grade), and common-mode transient immunity exceeds 25 kV/µs, ensuring robust operation in noisy industrial bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 25 Mbps (NRZ) - supports high-speed SPI clock rates up to 12.5 MHz with full duplex timing margin |
| Propagation Delay | 25 ns typical - enables tight timing budgets in real-time control loops and fast serial interfaces |
| Isolation Rating | 3750 VRMS for 1 minute - meets UL 1577 and reinforced insulation requirements per IEC 62368-1 |
| VIORM | 560 Vpeak - defines maximum continuous working voltage across barrier under reinforced insulation |
| Supply Range | VDDLx: 1.8–5.5 V; VDDx: 3.0–5.5 V - allows mixed-voltage system interfacing (e.g., 1.8 V FPGA ↔ 5 V sensor interface) |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial motor control applications |
| CM Transient Immunity | >25 kV/µs - maintains signal integrity during fast-switching transients in inverters and PLC I/O modules |
Pinout & Package
ADUM3481BRSZ uses a 20-lead, RoHS-compliant SSOP package (body size 7.2 mm × 5.3 mm, 0.65 mm pitch). Thermal resistance θJC = 50.5°C/W supports operation at full rating in compact enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | VDDL1 / VDDL2 | I/O supply rails (1.8–5.5 V) - bypassed externally; enable level translation independent of core supply |
| 2, 10, 11, 19 | GND1 / GND2 | Isolated ground references - pins internally connected in pairs; require separate PCB ground planes |
| 3–6, 15–18 | VIA–VID / VOA–VOD | Logic inputs A–D (Side 1), outputs A–D (Side 2) - 2/2 channel direction (A/B inputs → A/B outputs; C/D outputs ← C/D inputs) |
| 7, 14 | CTRL1 / CTRL2 | Output default select - TTL-compatible control; sets fail-safe state (low/high) during power loss or idle |
| 8, 13 | VDD1 / VDD2 | Core supply rails (3.0–5.5 V) - power internal transformers and logic; must be present for isolation function |
| 9, 12 | VDDC1 / VDDC2 | Regulator outputs - provide regulated bias for internal circuitry; not for external loading |
Key Features
| Feature | Design Value |
|---|---|
| iCoupler® transformer isolation | Eliminates LED aging and CTR drift of optocouplers; achieves 25 ns propagation delay vs. >100 ns in legacy isolators |
| Dual independent I/O supplies | Enables 1.8 V MCU ↔ 5 V analog front-end interfacing without external level shifters or voltage translators |
| Output default control | CTRL1/CTRL2 pins allow deterministic output state during power-up, brownout, or open-input conditions |
| VDE 0884-17 reinforced certification | Validated for 560 Vpeak working voltage and 1050 Vpeak production test - required for functional safety in IEC 61800-5-2 drives |
| High-temp operation | Specified performance maintained at +125°C ambient - suitable for placement near power stages without derating |
Applications
| SPI Interface Isolation | Industrial Field Bus Node |
|---|---|
Use Scenario: Isolating SPI communication between an ARM Cortex-M7 microcontroller and isolated 24-bit ΣΔ ADC in a servo drive. IC Role / Device Role / Timing Role: Quad-channel isolator with 2 input channels (SCLK/MOSI) and 2 output channels (MISO/CS), preserving full-duplex timing at 10 MHz. Use Value: Enables safe, noise-immune data acquisition across 3.75 kVRMS barrier while maintaining 25 ns timing alignment between clock and data edges. |
Use Scenario: Protecting RS-485 transceiver and controller in a distributed I/O module exposed to 2 kV surge events. IC Role / Device Role / Timing Role: Isolates UART TX/RX lines and control signals (EN, DE) between host MCU and isolated bus PHY. Use Value: Prevents ground loop currents and common-mode transients (>25 kV/µs) from disrupting communication or damaging the host processor. |
| Motor Control Gate Driver Interface | Programmable Logic Controller (PLC) Digital I/O |
Use Scenario: Interfacing isolated gate drivers (e.g., ADuM4135) with PWM generator in a three-phase inverter. IC Role / Device Role / Timing Role: Transmits dead-time-controlled PWM signals (CH1–CH4) with matched propagation delay (≤17 ns skew) to ensure precise phase alignment. Use Value: Eliminates shoot-through risk caused by channel-to-channel timing mismatch in high-frequency SiC/GaN switching applications. |
Use Scenario: Providing galvanic isolation for 24 V DC digital inputs/outputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Isolates status feedback (input) and actuation commands (output) between field-side terminals and CPU-side logic. Use Value: Meets IEC 61000-4-5 surge immunity (4 kV) and pollution degree 2 requirements for factory-floor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641ED-B-IS | Capacitive isolation; 25 Mbps; 3.75 kVRMS; no integrated regulator outputs; VDDIO = 2.5–5.5 V only | Lacks independent 1.8 V I/O support and CTRL-based default control; requires external bias for low-voltage logic | Preferred when board space is constrained and 1.8 V interfacing is unnecessary |
| ISO6741-Q1 | Capacitive isolation; AEC-Q100 qualified; 50 Mbps; 5 kVRMS; 1.71–5.5 V I/O; no default control pins | Automotive-grade qualification and higher speed, but no output default select - unsuitable for fail-safe industrial shutdown logic | Select for automotive body electronics where ASIL-B compliance and higher bandwidth are mandatory |
Compared with SI8641ED-B-IS and ISO6741-Q1, ADUM3481BRSZ uniquely combines 1.8 V I/O compatibility, programmable output defaults, and VDE 0884-17 reinforced certification - making it optimal for industrial motion control where deterministic power-up behavior and mixed-voltage interoperability are critical.
Availability
ADUM3481BRSZ is available at Aetrix Electronics and suitable for industrial motor drives, PLC I/O modules, and isolated data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for ADUM3481BRSZ 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 ADuM348x family was designed specifically for high-reliability, multi-channel digital isolation in harsh industrial environments - emphasizing low propagation delay, wide supply flexibility, and regulatory-compliant reinforced insulation.
FAQ
What is the maximum data rate supported by ADUM3481BRSZ?
ADUM3481BRSZ supports up to 25 Mbps in NRZ format, verified across all operating voltages (1.8 V, 3 V, and 5 V I/O) and temperature range (−40°C to +125°C). This enables reliable SPI clocking at 12.5 MHz with sufficient setup/hold margin. The 25 Mbps rating applies specifically to the B-grade version, which ADUM3481BRSZ belongs to.
Does ADUM3481BRSZ support 1.8 V logic on both sides of the isolation barrier?
No - ADUM3481BRSZ supports 1.8 V to 5.5 V on its I/O supply rails (VDDL1/VDDL2), but its core supply rails (VDD1/VDD2) require 3.0 V to 5.5 V. This allows 1.8 V logic on one side (e.g., FPGA I/O bank) to interface with 5 V logic on the other (e.g., isolated DAC), but both sides cannot operate at 1.8 V simultaneously due to core voltage constraints.
How does the CTRL1 and CTRL2 functionality work in ADUM3481BRSZ?
In ADUM3481BRSZ, CTRL1 (Pin 7) sets the default output state for Side 1 outputs (VOA–VOB), and CTRL2 (Pin 14) sets the default for Side 2 outputs (VOC–VOD). When pulled low, outputs default to logic low; when high, they default to logic high. This ensures predictable behavior during power-up, brownout, or signal loss - a critical feature for safety-critical industrial control paths.
What safety certifications apply to ADUM3481BRSZ?
ADUM3481BRSZ carries UL 1577 (3750 VRMS), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) approvals. The VDE 0884-17 certification confirms reinforced insulation with VIORM = 560 Vpeak, validated by 100% production partial-discharge testing at 1050 Vpeak.
Can ADUM3481BRSZ replace ADUM3480BRSZ or ADUM3482BRSZ on the same PCB?
No - ADUM3481BRSZ has a unique 2-input/2-output channel direction (A/B inputs → A/B outputs; C/D outputs ← C/D inputs), differing from ADUM3480 (4-input/0-output) and ADUM3482 (2-input/2-output but with reversed C/D assignment). Pinouts are identical, but signal routing and CTRL pin usage differ; direct replacement requires layout and firmware validation.
ADUM3481BRSZ 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:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 33ns, 33ns
- Pulse Width Distortion (Max):
- 3ns
- 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
ADUM3481BRSZ FAQ
1.How can I place an order for ADUM3481BRSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3481BRSZ 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 ADUM3481BRSZ reliable?
The price and inventory of ADUM3481BRSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3481BRSZ is usually 5 days.
3.What payment methods are accepted for ADUM3481BRSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3481BRSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3481BRSZ?
ADUM3481BRSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3481BRSZ 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 ADUM3481BRSZ?
For technical support, including ADUM3481BRSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3481BRSZ requirements.
6.How does Aetrix verify that ADUM3481BRSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3481BRSZ 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 ADUM3481BRSZ meets industry standards.
7.What is the process for return or replacement of ADUM3481BRSZ?
All ADUM3481BRSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3481BRSZ, 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 ADUM3481BRSZ part is unused and in its original packaging.
Return procedure for ADUM3481BRSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM3481BRSZ Tags
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