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Analog Devices Inc. ADUM3471WARSZ
- Part No.:
- ADUM3471WARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3471WARSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,103
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Product details
Overview
ADUM3471WARSZ 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 5 V isolated output at up to 400 mA (2 W), supports 25 Mbps data rates (C grade), features 20-lead SSOP package, and provides reinforced insulation rated at 2500 Vrms for 1 minute - enabling compact, self-powered isolation in industrial RS-485 transceivers and automotive sensor interfaces.
For engineers reviewing the ADUM3471WARSZ datasheet, ADUM3471WARSZ pinout, ADUM3471WARSZ application, or ADUM3471WARSZ equivalent, this device serves as a complete isolated power + signal solution eliminating external isolated DC/DC converters while maintaining high CMTI (>25 kV/µs), soft-start, pulse-by-pulse overcurrent protection, and automotive qualification.
Technical Context
The ADUM3471WARSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four logic channels and a secondary-side-controlled PWM controller driving an external transformer to generate regulated isolated power. Its oscillator frequency is adjustable from 200 kHz to 1 MHz via external resistor, and feedback is implemented using a precision 1.25 V reference (±10% tolerance) referenced to the isolated VISO rail.
It implements active secondary-side regulation via optocoupler-free architecture: the isolated output voltage is sensed and regulated directly on the secondary side, with error signal transmitted across the isolation barrier via dedicated control channel, enabling tight load/line regulation (≤2%) and 70% efficiency at full 400 mA/5 V load without optocoupler latency or drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 Vrms for 1 min (UL 1577); VIORM = 560 Vpeak (reinforced, VDE 0884-17) |
| Output Power | 2 W max at 5 V / 400 mA - sufficient to power isolated gate drivers, ADCs, or transceivers without auxiliary supply |
| Data Rate | 25 Mbps (C grade) - supports high-speed CAN FD, SPI, or RS-485 timing-critical links |
| CMTI | >25 kV/µs - ensures robust operation in noisy motor drives and inverters with fast switching transients |
| Efficiency | 70% at full 400 mA load - enables thermally constrained designs without heatsinking at 105°C ambient |
| Package | 20-lead SSOP (0.209" wide, 0.65 mm pitch) - surface-mount compatible with standard reflow profiles |
| Operating Temp | −40°C to +105°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
ADUM3471WARSZ uses a 20-lead SSOP package with 0.65 mm lead pitch and 5.3 mm minimum creepage/clearance between primary and secondary sides per IEC 60747-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply input | Accepts 3.0–5.5 V; powers internal logic and primary-side isolator channels |
| GND1 | Primary-side ground reference | Return path for VDD1 and input-side I/O; must be separated from GND2 by ≥5.3 mm |
| INA, INB, INC, IND | Primary-side digital inputs | CMOS-compatible (VIH = 2.0 V min @ 5 V); drive isolated output channels A–D |
| VDD2 | Secondary-side logic supply | Internally regulated 5.0 V (±10%) output; powers secondary-side logic and outputs |
| GND2 | Secondary-side ground reference | Return for VDD2 and isolated outputs; galvanically isolated from GND1 |
| VISO | Regulated isolated output | Adjustable 3.3–24 V via external resistor divider; 5 V nominal (±10%) at 400 mA |
| FB | Feedback input for VISO regulation | Connects to resistor divider; references internal 1.25 V bandgap (±10%) |
| ROC | Oscillator frequency setting | Resistor to GND sets fSW = 200 kHz–1 MHz; enables EMI optimization |
| EN | Enable input | Active-high; disables PWM and isolator outputs when low; includes internal pull-down |
| OUTA–OUTD | Secondary-side digital outputs | CMOS outputs (VOH = VISO − 0.3 V min); drive loads up to 4 mA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC/DC converter | Eliminates need for external isolated power supply - reduces BOM count and PCB area in space-constrained designs |
| Secondary-side regulation | Direct sensing and control on isolated side avoids optocoupler drift and temperature dependence |
| Pulse-by-pulse overcurrent protection | Shuts down switching cycle-by-cycle during overload - prevents transformer saturation and MOSFET failure |
| Soft-start function | Gradually ramps VISO at power-up to limit inrush current into downstream capacitive loads |
| Thermal shutdown with hysteresis | Triggers at 150°C (TJ), releases at 130°C - protects against sustained overloads or poor heatsinking |
Applications
| Industrial Field Bus Isolation | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in PLC backplanes exposed to ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: Provides both isolated 5 V power and four bidirectional data channels for half-duplex bus communication. Use Value: Enables single-chip isolation with 25 kV/µs CMTI and 2500 Vrms withstand, reducing component count versus discrete isolator + DC/DC solutions. |
Use Scenario: Isolating position sensors in electric power steering (EPS) modules where EMI immunity and AEC-Q100 compliance are mandatory. IC Role / Device Role / Timing Role: Supplies isolated 5 V to Hall-effect sensor and transmits analog-to-digital converted signals across barrier with <60 ns propagation delay skew. Use Value: Meets automotive temperature range (−40°C to +105°C) and safety standards (IEC 62368-1, ISO 26262 ASIL-B ready) without external regulators. |
| Power Supply Start-up Bias | Isolated Sensor Signal Conditioning |
|
Use Scenario: Providing initial bias power to gate drivers in isolated LLC resonant converters during startup before main transformer delivers energy. IC Role / Device Role / Timing Role: Generates regulated 15 V isolated output (via external transformer design) to enable high-side MOSFET turn-on sequence. Use Value: Delivers 100 mA at 15 V with 70% efficiency - sufficient to bootstrap UCC27531 gate drivers without auxiliary winding or flyback controller. |
Use Scenario: Isolating 24-bit sigma-delta ADC outputs in precision current shunt monitors used in battery management systems. IC Role / Device Role / Timing Role: Transfers serial data (SPI clock/data) across isolation barrier while powering ADC's isolated digital section from VISO. Use Value: Supports 25 Mbps data rate with <8 ns pulse width distortion - preserves timing integrity for 1 MSPS sampling without added jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4471ARIZ | Higher isolation rating (5000 Vrms), 4 W output, wider temp range (−40°C to +125°C), larger 20-lead SOIC package | Better suited for medical or high-reliability industrial systems requiring extended lifetime insulation and higher power | Select ADUM4471ARIZ when >2500 Vrms isolation or >2 W output is required; ADUM3471WARSZ remains optimal for cost-sensitive automotive and fieldbus designs. |
| SI88442ED-IS | 4-channel isolator + integrated DC/DC (1.5 W), lower CMTI (15 kV/µs), different pinout, no adjustable oscillator | Limited to lower-noise environments; lacks programmable frequency and secondary-side regulation loop | Choose SI88442ED-IS only if footprint compatibility with Si88xx family is critical; ADUM3471WARSZ offers superior regulation accuracy and transient immunity. |
Compared with ADUM4471ARIZ and SI88442ED-IS, ADUM3471WARSZ delivers best-in-class CMTI (>25 kV/µs) and secondary-side regulation in a compact SSOP package, making it ideal for automotive and industrial applications demanding high noise immunity and minimal board space - without over-specifying isolation or power.
Availability
ADUM3471WARSZ is available at Aetrix Electronics and suitable for industrial fieldbus isolation, automotive sensor interfaces, isolated power supply start-up, and precision sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADUM3471WARSZ 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 ADuM347x product line was designed to replace optocoupler-based isolated power and signal solutions with integrated, high-efficiency, high-CMTI alternatives for space-constrained and noise-immune applications.
FAQ
What is the maximum isolated output voltage supported by ADUM3471WARSZ?
ADUM3471WARSZ supports an adjustable isolated output voltage from 3.3 V to 24 V using an external resistor divider on the FB pin. The internal feedback reference is 1.25 V ±10%, and typical configurations deliver 5 V (±10%) at up to 400 mA or 15 V (±10%) at up to 100 mA. Output voltage selection is validated per Table 3 (5 V input / 3.3 V output) and Table 4 (5 V input / 15 V output) in the Rev. C datasheet.
Does ADUM3471WARSZ require an external transformer, and what are key design constraints?
Yes, ADUM3471WARSZ requires an external center-tapped transformer for isolated power generation. Key constraints include minimum ET constant (≥20 V·µs for 5 V output), primary inductance (≥12 µH), and isolation voltage rating (≥3000 Vrms). Transformer turns ratio must match selected VISO; e.g., 1:1 for 5 V output, 1:3 for 15 V output. Design guidance is provided in Figures 38–39 and Sections "Transformer Design" through "Switching Frequency".
How does the secondary-side regulation in ADUM3471WARSZ improve performance over optocoupler-based feedback?
ADUM3471WARSZ implements direct sensing and regulation on the secondary side using an internal error amplifier and dedicated control channel, eliminating optocoupler nonlinearity, CTR degradation, and temperature drift. This achieves ≤2% load regulation and stable 70% efficiency across temperature and line - unlike optocoupler-based systems where feedback accuracy degrades over time and temperature, requiring derating or recalibration.
What safety certifications apply to ADUM3471WARSZ, and what do they cover?
ADUM3471WARSZ is certified to UL 1577 (2500 Vrms/1 min), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, CQC GB 4943.1, and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 560 Vpeak). These cover dielectric strength, creepage/clearance (≥5.3 mm), material tracking resistance (CTI >600 V), and lifetime insulation performance - enabling use in safety-critical industrial and automotive end equipment.
Can ADUM3471WARSZ operate with a 3.3 V primary supply, and what is its output capability in that configuration?
Yes, ADUM3471WARSZ supports 3.0–3.6 V primary supply (VDD1). In 3.3 V input / 3.3 V isolated output mode, it delivers up to 250 mA at 70% efficiency (Table 2). Available VISO supply current drops to 244 mA at 25 Mbps due to higher dynamic loading, but remains sufficient for powering isolated microcontrollers or low-power transceivers without external regulation.
ADUM3471WARSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- Automotive
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
ADUM3471WARSZ FAQ
1.How can I place an order for ADUM3471WARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3471WARSZ 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 ADUM3471WARSZ reliable?
The price and inventory of ADUM3471WARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3471WARSZ is usually 5 days.
3.What payment methods are accepted for ADUM3471WARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3471WARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3471WARSZ?
ADUM3471WARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3471WARSZ 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 ADUM3471WARSZ?
For technical support, including ADUM3471WARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3471WARSZ requirements.
6.How does Aetrix verify that ADUM3471WARSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3471WARSZ 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 ADUM3471WARSZ meets industry standards.
7.What is the process for return or replacement of ADUM3471WARSZ?
All ADUM3471WARSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3471WARSZ, 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 ADUM3471WARSZ part is unused and in its original packaging.
Return procedure for ADUM3471WARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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