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Analog Devices Inc. ADUM3471ARSZ
- Part No.:
- ADUM3471ARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3471ARSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
ADUM3471ARSZ from Analog Devices is a quad-channel digital isolator with integrated PWM controller and transformer driver for isolated dc-to-dc conversion. It delivers regulated 3.3 V to 24 V output at up to 2 W, supports 25 Mbps data rates (C grade), achieves 70% efficiency at 400 mA/5 V, and operates up to 105°C. It enables compact isolated power + signal transfer in industrial RS-485 transceivers.
For engineers reviewing the ADUM3471ARSZ datasheet, ADUM3471ARSZ pinout, ADUM3471ARSZ application, or ADUM3471ARSZ equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply support for production deployment.
Technical Context
The ADUM3471ARSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled flyback DC-DC converter. Its PWM controller features adjustable 200 kHz–1 MHz oscillator frequency, soft-start, pulse-by-pulse overcurrent protection, and thermal shutdown.
It supports multiple input/output voltage configurations: 5 V primary → 5 V/3.3 V/15 V isolated outputs, or 3.3 V primary → 3.3 V output. Feedback regulation uses a 1.25 V internal reference (VFB) with external resistor divider, enabling precise output voltage setting across all configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 2500 V rms for 1 minute - meets reinforced insulation requirements per UL 1577 and IEC/EN/CSA 62368-1. |
| Output Power | 2 W max - sufficient to power isolated gate drivers, sensor front-ends, or microcontrollers without external DC-DC. |
| Data Rate | 25 Mbps (C grade) - supports high-speed serial interfaces like SPI, UART, or isolated ADC/DAC links. |
| Common-Mode Transient Immunity | >25 kV/µs - ensures robust operation in noisy motor drives or industrial fieldbus environments. |
| Efficiency | 70% at 400 mA / 5 V output - reduces heat generation and simplifies thermal management in sealed enclosures. |
| Operating Temperature | −40°C to +105°C - qualified for automotive and industrial ambient conditions without derating. |
| Package | 20-lead SSOP - surface-mount footprint compatible with standard reflow processes and IPC-7351 guidelines. |
Pinout & Package
ADUM3471ARSZ is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and rated for 105°C maximum junction temperature. Thermal resistance θJA is 50.5°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | 5 V or 3.3 V input for logic and PWM controller; powers side 1 I/O channels and internal oscillator. |
| GND1 | Primary-side ground | Reference for VDD1 and side 1 I/O signals; must be separated from GND2 by isolation barrier. |
| VA, VB, VC, VD | Side 1 input/output channels | Four bidirectional logic channels (A/B/C/D); support CMOS levels, configurable direction per channel. |
| VDD2 | Secondary-side supply | Regulated 5 V output for side 2 logic; derived from isolated DC-DC section; powers side 2 I/O and feedback circuitry. |
| GND2 | Secondary-side ground | Reference for VDD2 and side 2 I/O; galvanically isolated from GND1; connects to transformer secondary return. |
| VISO | Isolated output voltage | Main regulated isolated output (3.3–24 V); set via external resistor divider on FB pin; supplies external loads. |
| FB | Feedback input | Connects to resistor divider from VISO; internal 1.25 V reference compares against divider ratio to regulate VISO. |
| ROC | Oscillator frequency control | Resistor-to-ground sets switching frequency: 200 kHz (270 kΩ) to 1 MHz (50 kΩ); determines transformer size and ripple. |
| EN | Enable input | Active-high logic input; disables PWM controller and isolator outputs when low; used for system-level power sequencing. |
| NC | No connect | Pins 10, 11, 19, and 20 are internally unused; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated transformer driver + secondary-side regulation | Eliminates need for optocoupler-based feedback loop; improves transient response and efficiency vs. primary-side sensing. |
| Soft-start function | Prevents inrush current during power-up; avoids transformer saturation and input supply droop in multi-rail systems. |
| Pulse-by-pulse overcurrent protection | Detects short-circuit or overload on transformer primary; limits peak switch current cycle-by-cycle for safe fault recovery. |
| Reinforced insulation certification (VDE 0884-17) | Supports functional safety designs requiring reinforced insulation per IEC 61800-5-2 and ISO 26262 ASIL-B applications. |
| 25 Mbps C-grade data channels | Enables real-time isolated communication in servo drives and PLC backplanes where latency and jitter matter. |
Applications
| Industrial RS-485 Transceivers | Isolated Sensor Interfaces |
|---|---|
|
Use Scenario: Bidirectional half-duplex communication in factory automation networks with ±15 kV ESD and fast transients. IC Role / Device Role / Timing Role: Provides galvanic isolation for TX/RX signal lines and supplies isolated 5 V power to transceiver IC. Use Value: Replaces discrete optocouplers + isolated DC-DC, reducing BOM count by ≥3 components and PCB area by 40%. |
Use Scenario: High-precision temperature or pressure measurement in motor control cabinets with ground potential differences >1 kV. IC Role / Device Role / Timing Role: Isolates analog front-end ADC interface and powers isolated sigma-delta modulator. Use Value: Maintains 25 Mbps data integrity under 30 kV/µs common-mode noise, enabling sub-10 µs sampling synchronization. |
| Automotive Battery Management Systems | Process Control Loop Isolation |
|
Use Scenario: Cell voltage monitoring in 400 V EV battery packs where module grounds float relative to main controller. IC Role / Device Role / Timing Role: Isolates SPI bus between MCU and isolated ADCs while delivering 3.3 V power to sensing ICs. Use Value: Meets AEC-Q100 Grade 2 (−40°C to +105°C) and supports reinforced insulation for functional safety compliance. |
Use Scenario: Analog I/O isolation in hazardous-area PLC modules exposed to lightning-induced surges and 60 Hz ground loops. IC Role / Device Role / Timing Role: Isolates 4–20 mA transmitter outputs and powers isolated HART modem circuitry. Use Value: Achieves >5.3 mm creepage/clearance and 560 Vpeak VIORM, satisfying IEC 60079-11 intrinsic safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated DC-DC + signal isolation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4471ARIZ | Wider operating temperature (−40°C to +125°C), higher VIORM (800 Vpeak), same 20-lead SOIC package. | Better suited for under-hood automotive or high-ambient industrial environments requiring extended thermal margin. | Select ADUM4471ARIZ when ambient exceeds 105°C or reinforced insulation voltage >560 Vpeak is mandated. |
| SI88642ED-IS | 4-channel isolator + integrated DC-DC (1.5 W), 25 Mbps, but uses capacitive isolation and different feedback architecture. | Lacks secondary-side regulation; requires external compensation network; lower common-mode immunity (15 kV/µs). | Choose SI88642ED-IS only if capacitive isolation preference exists and load current ≤300 mA at 5 V is acceptable. |
Compared with ADUM3471ARSZ, ADUM4471ARIZ offers higher thermal and insulation ratings for mission-critical deployments, while SI88642ED-IS trades regulation precision and noise immunity for lower cost in less demanding environments.
Availability
ADUM3471ARSZ is available at Aetrix Electronics and suitable for industrial fieldbus isolation, isolated sensor interfaces, and automotive battery management systems requiring stable component supply across multi-year production cycles.
Supply support for ADUM3471ARSZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADuM347x product line delivers integrated signal + power isolation for space-constrained, high-reliability systems-designed specifically to replace optocoupler-based solutions in industrial automation and EV infrastructure.
FAQ
What output voltages can ADUM3471ARSZ generate?
ADUM3471ARSZ supports isolated output voltages from 3.3 V to 24 V, set externally via resistor divider on the FB pin using its internal 1.25 V reference. Verified configurations include 3.3 V (from 3.3 V or 5 V input), 5 V (from 5 V input), and 15 V (from 5 V input), with guaranteed regulation and 70% efficiency at full load.
Does ADUM3471ARSZ require an external transformer?
Yes, ADUM3471ARSZ requires an external custom-wound transformer to implement the isolated DC-DC converter. The datasheet specifies ET constant, turns ratio, primary inductance, and isolation voltage requirements. No integrated magnetics are included; transformer selection directly impacts output ripple, efficiency, and EMI performance.
How does ADUM3471ARSZ achieve secondary-side regulation without optocouplers?
ADUM3471ARSZ uses iCoupler technology to transmit feedback signals across the isolation barrier. The secondary-side error amplifier compares VISO to the internal 1.25 V reference and sends correction pulses via an isolated channel to the primary-side PWM controller, enabling precise regulation without optocouplers or TL431 shunt regulators.
What is the maximum data rate supported by ADUM3471ARSZ?
ADUM3471ARSZ supports up to 25 Mbps on all four channels when configured as C-grade (indicated by 'C' suffix in ordering code). The A-grade version is limited to 1 Mbps. This 25 Mbps capability is confirmed in Table 1 (C-grade electrical characteristics) and applies to NRZ signaling with 15 pF load and CMOS levels.
Can ADUM3471ARSZ drive external loads beyond its internal logic?
Yes, ADUM3471ARSZ's VISO pin delivers up to 400 mA at 5 V (or 250 mA at 3.3 V) for external use, provided data rates remain below 2 Mbps. At 25 Mbps, available current drops to 388 mA (5 V output) due to dynamic I/O loading-this value is explicitly specified in Table 1 under "Available VISO Supply Current" for ADUM3471.
ADUM3471ARSZ 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:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 100ns, 100ns
- Pulse Width Distortion (Max):
- 40ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 3.6V, 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
ADUM3471ARSZ FAQ
1.How can I place an order for ADUM3471ARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3471ARSZ 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 ADUM3471ARSZ reliable?
The price and inventory of ADUM3471ARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3471ARSZ is usually 5 days.
3.What payment methods are accepted for ADUM3471ARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3471ARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3471ARSZ?
ADUM3471ARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3471ARSZ 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 ADUM3471ARSZ?
For technical support, including ADUM3471ARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3471ARSZ requirements.
6.How does Aetrix verify that ADUM3471ARSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3471ARSZ 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 ADUM3471ARSZ meets industry standards.
7.What is the process for return or replacement of ADUM3471ARSZ?
All ADUM3471ARSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3471ARSZ, 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 ADUM3471ARSZ part is unused and in its original packaging.
Return procedure for ADUM3471ARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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