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Analog Devices Inc. ADUM3474WARSZ
- Part No.:
- ADUM3474WARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3474WARSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
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Product details
Overview
ADUM3474WARSZ from Analog Devices is a quad-channel digital isolator with integrated PWM controller and transformer driver for isolated dc-to-dc conversion. It delivers up to 2 W regulated isolated output (3.3 V–24 V), supports 25 Mbps data rate per channel, achieves 70% efficiency at 400 mA/5 V output, and operates up to 105°C. It is used in RS-485 transceiver bias supplies and industrial fieldbus isolation interfaces.
For engineers reviewing the ADUM3474WARSZ datasheet, ADUM3474WARSZ pinout, ADUM3474WARSZ application, or ADUM3474WARSZ equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options for automotive-qualified isolated power + signal transfer designs.
Technical Context
The ADUM3474WARSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled flyback DC/DC converter. Its oscillator frequency is adjustable from 200 kHz to 1 MHz via external resistor, and it implements pulse-by-pulse overcurrent protection plus thermal shutdown.
It features reinforced insulation rated VIORM = 560 V peak and VISO = 2500 V rms (1 min), certified to UL 1577, IEC/EN/CSA 62368-1, IEC/CSA 61010-1, CQC GB 4943.1, and DIN EN IEC 60747-17 (VDE 0884-17), with common-mode transient immunity >25 kV/µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 V rms (1 min); enables safe operation in industrial mains-referenced systems |
| Output Power | 2 W max; sufficient to power isolated gate drivers, ADCs, or RS-485 transceivers without external DC/DC |
| Regulated Output Range | 3.3 V to 24 V; set via external feedback resistors - supports multiple system voltage domains |
| Data Rate | 25 Mbps (C grade); meets high-speed serial interface requirements for CAN FD, SPI, and digital I/O |
| Efficiency | 70% at 400 mA / 5 V output; reduces heat generation and improves thermal margin in compact layouts |
| Operating Temperature | −40°C to +105°C; qualified for under-hood automotive and factory-floor industrial environments |
| Package | 20-lead SSOP; surface-mount compatible with standard reflow profiles and IPC-compliant board assembly |
Pinout & Package
ADUM3474WARSZ uses a 20-lead SSOP package (5.3 mm × 7.2 mm, 0.65 mm pitch) with creepage/clearance >5.3 mm between input and output sides. Pin 1 is marked with dot; pins 1–10 form the primary (input) side, pins 11–20 the secondary (output) side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply input | Accepts 3.0–5.5 V; powers internal logic and isolator transmitter circuits |
| GND1 | Primary-side ground reference | Return path for VDD1 and input-side I/O; must be separated from GND2 by isolation barrier |
| INA, INB, INC, IND | Input data channels A–D | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V); drive isolated output channels |
| VDD2 | Secondary-side linear regulator output | 5.0 V ±10% regulated output (4.6–5.7 V); powers secondary-side logic and isolator receivers |
| GND2 | Secondary-side ground reference | Return for VDD2, VISO, and output-side I/O; forms isolated domain with VDD2/VISO |
| VISO | Isolated DC/DC output | Adjustable 3.3–24 V output; supplies external loads (e.g., isolated transceivers, sensors) |
| FB | Feedback input for VISO regulation | Connects to resistor divider from VISO; sets output voltage via VFB = 1.25 V (±10%) |
| ROC | Oscillator frequency control | Resistor-to-ground sets fSW from 200 kHz to 1 MHz; determines transformer size and efficiency trade-off |
Key Features
| Feature | Design Value |
|---|---|
| Integrated transformer driver + PWM controller | Eliminates need for discrete gate driver and controller ICs - reduces BOM count and layout area by ~40% |
| Soft-start function | Prevents inrush current during power-up; avoids overshoot on VISO and stabilizes startup sequence |
| Pulse-by-pulse overcurrent protection | Detects short-circuit or overload on transformer secondary in real time; limits peak switch current per cycle |
| Reinforced insulation certification (VDE 0884-17) | Enables use in safety-critical applications requiring double insulation - e.g., motor drives, medical auxiliary power |
| 25 kV/µs common-mode transient immunity | Rejects fast noise transients from motor switching or ESD events - ensures reliable communication in noisy factories |
Applications
| Industrial Fieldbus Isolation | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in PLC backplanes and distributed I/O modules exposed to 24 V DC field wiring. IC Role / Device Role / Timing Role: Provides both isolated 5 V bias for transceiver ICs and 25 Mbps bidirectional data isolation across the bus interface. Use Value: Eliminates separate isolated DC/DC converter while maintaining 2500 V rms working voltage and <50 ns channel skew for deterministic timing. |
Use Scenario: Signal and power isolation between battery cell monitoring ICs (e.g., AD7280A) and MCU host in EV battery packs. IC Role / Device Role / Timing Role: Delivers isolated 3.3 V supply to sensing front-end and transfers cell voltage/status data with <8 ns pulse width distortion. Use Value: Meets AEC-Q100 Grade 2 temperature requirement (−40°C to +105°C) and supports functional safety architecture per ISO 26262 ASIL-B. |
| Isolated Sensor Interface | Power Supply Start-up Bias |
|
Use Scenario: Isolating analog sensor signal conditioning circuits (e.g., load cells, pressure transducers) from noisy main controller domains. IC Role / Device Role / Timing Role: Supplies clean, regulated 5 V to isolated op-amps/ADCs and transmits digitized data across barrier at 10+ Mbps. Use Value: Achieves >100 dB CMRR at 100 kHz due to >25 kV/µs CMTI - prevents measurement corruption from switching power supplies. |
Use Scenario: Providing initial start-up bias to isolated gate drivers (e.g., ADuM4122) in high-voltage inverters before main DC bus is energized. IC Role / Device Role / Timing Role: Generates 15 V isolated output (via external transformer) to enable bootstrap charging and pre-gate activation sequencing. Use Value: Supports 15 V VISO configuration with 100 mA output - sufficient to charge gate driver capacitors without auxiliary winding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated power + signal transfer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3471WARSZ | Same 20-lead SSOP package and pinout; lower isolated output current (388 mA @ 5 V vs. 382 mA for ADUM3474WARSZ) and reduced IDD1 supply current at 25 Mbps (46 mA vs. 52 mA) | Lower power consumption suits low-duty-cycle telemetry links; not rated for same automotive thermal margin at full load | Select when system-level power budget is constrained and 25 Mbps data rate is required but peak VISO load ≤350 mA |
| ADUM4471ARIZ | 44-lead QSOP package; higher isolation rating (5000 V rms), wider VISO range (up to 24 V), and improved efficiency (75% @ 5 V/400 mA) | Supports higher working voltages and longer insulation lifetime; requires PCB redesign due to larger footprint and different pin spacing | Choose for new designs needing enhanced safety margin, extended creepage, or higher reliability in harsh environments |
Compared with ADUM3474WARSZ, ADUM3471WARSZ offers lower quiescent current but reduced VISO load headroom, while ADUM4471ARIZ delivers higher isolation and efficiency at the cost of larger size and non-drop-in compatibility - making ADUM3474WARSZ optimal for space-constrained automotive and industrial modules requiring AEC-Q100 qualification and 20-lead SSOP fit.
Availability
ADUM3474WARSZ is available at Aetrix Electronics and suitable for industrial fieldbus isolation, automotive battery management systems, and isolated sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for ADUM3474WARSZ 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The ADuM347x family was designed to integrate isolated power and signal transfer into a single compact package for industrial automation, automotive electrification, and energy infrastructure systems where board space, reliability, and safety certification are critical.
FAQ
What is the maximum isolated output voltage supported by ADUM3474WARSZ?
ADUM3474WARSZ supports an adjustable isolated output voltage from 3.3 V to 24 V, set using an external resistor divider on the FB pin. The feedback voltage setpoint is 1.25 V (±10%), and the device maintains regulation across line and load variations per datasheet Table 1–4. This range allows direct powering of diverse downstream ICs including RS-485 transceivers, isolated ADCs, and gate drivers without additional regulators. ADUM3474WARSZ achieves this using its integrated transformer driver and secondary-side control loop.
Does ADUM3474WARSZ require an external transformer?
Yes, ADUM3474WARSZ requires an external custom-wound transformer to implement the isolated DC/DC converter. The device integrates the PWM controller and transformer driver but does not include magnetic components. Transformer design parameters - including turns ratio, ET constant, primary inductance, and isolation voltage - are specified in the ADUM3474WARSZ datasheet Application Information section. Analog Devices provides reference designs (e.g., ADI AN-1262) and recommended part numbers (e.g., Pulse Electronics PA0168.x series) for validated magnetics.
What safety certifications apply to ADUM3474WARSZ?
ADUM3474WARSZ is certified to UL 1577 (2500 V rms, 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. Its VIORM rating is 560 V peak, and minimum creepage/clearance exceeds 5.3 mm. These approvals support use in industrial equipment, automotive ECUs, and medical auxiliary power systems meeting basic or reinforced insulation requirements per IEC 61508 and ISO 26262.
How does the soft-start function operate in ADUM3474WARSZ?
ADUM3474WARSZ implements internal soft-start by gradually increasing the PWM duty cycle during power-up, limiting inrush current into the transformer primary and preventing output voltage overshoot on VISO and VDD2. This behavior is automatic and requires no external components. Soft-start duration is fixed and optimized to balance startup time (<10 ms typical) with stress reduction on the external transformer and output capacitors - critical for reliability in repeated cold-start scenarios in automotive and industrial applications. ADUM3474WARSZ maintains this behavior across all supported input/output configurations.
Can ADUM3474WARSZ support 15 V isolated output?
Yes, ADUM3474WARSZ supports 15 V isolated output, as confirmed in Table 4 of the datasheet (5 V primary / 15 V secondary configuration). At 15 V VISO, it delivers up to 100 mA output current with 70% efficiency. The FB pin must be configured with R1 = 49.9 kΩ and R2 = 4.02 kΩ to set VISO = 15 V. Output ripple is specified at 200 mV p-p (20 MHz BW), and noise at 500 mV p-p - acceptable for biasing gate drivers or analog front-ends when paired with local LC filtering. ADUM3474WARSZ maintains full 25 Mbps data rate capability in this configuration.
ADUM3474WARSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 0/4
- 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
ADUM3474WARSZ FAQ
1.How can I place an order for ADUM3474WARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3474WARSZ 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 ADUM3474WARSZ reliable?
The price and inventory of ADUM3474WARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3474WARSZ is usually 5 days.
3.What payment methods are accepted for ADUM3474WARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3474WARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3474WARSZ?
ADUM3474WARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3474WARSZ 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 ADUM3474WARSZ?
For technical support, including ADUM3474WARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3474WARSZ requirements.
6.How does Aetrix verify that ADUM3474WARSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3474WARSZ 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 ADUM3474WARSZ meets industry standards.
7.What is the process for return or replacement of ADUM3474WARSZ?
All ADUM3474WARSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3474WARSZ, 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 ADUM3474WARSZ part is unused and in its original packaging.
Return procedure for ADUM3474WARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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