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Analog Devices Inc. ADUM3474CRSZ
- Part No.:
- ADUM3474CRSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3474CRSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
ADUM3474CRSZ 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 up to 2 W, supports 25 Mbps data rate (C grade), achieves 70% efficiency at 400 mA/5 V, and operates up to 105°C - enabling compact isolated power + signal transfer in industrial RS-485 transceivers and automotive sensor interfaces.
For engineers reviewing the ADUM3474CRSZ datasheet, ADUM3474CRSZ pinout, ADUM3474CRSZ application, or ADUM3474CRSZ equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts for isolated power+signal designs requiring reinforced insulation, high CMTI (>25 kV/µs), and automotive qualification.
Technical Context
The ADUM3474CRSZ 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 and 3.3 V primary → 3.3 V output, with feedback setpoint fixed at 1.25 V and line/load regulation under 2%. The device implements reinforced insulation per DIN EN IEC 60747-17 (VIORM = 560 V peak) and meets UL 1577 (VISO = 2500 V rms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 V rms for 1 minute (UL 1577); 560 V peak working voltage (reinforced, VDE 0884-17) |
| Output Power | 2 W max, regulated 3.3–24 V output with 70% efficiency at 400 mA/5 V load |
| Data Rate | 25 Mbps (C grade only), NRZ format, 40 ns min pulse width, 8 ns pulse width distortion |
| CMTI | >25 kV/µs common-mode transient immunity ensures robust operation in noisy motor drives and inverters |
| Operating Temp | −40°C to +105°C ambient, qualified for automotive applications per AEC-Q100 stress testing |
| Package | 20-lead SSOP (0.150" wide), θJA = 50.5°C/W on 4-layer board |
| Regulatory | UL 1577, IEC/EN/CSA 62368-1, IEC/CSA 61010-1, CQC GB 4943.1, VDE 0884-17 certified |
Pinout & Package
ADUM3474CRSZ uses a 20-lead SSOP package (5.3 mm × 7.2 mm, 0.635 mm pitch) with input-side (Pins 1–10) and output-side (Pins 11–20) grouped for optimal creepage/clearance. Pin 1 is marked with dot; Pin 10 and Pin 11 are isolation barrier boundaries.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | 3.3 V or 5.0 V input for logic and PWM controller; UVLO thresholds at 2.6 V / 2.8 V |
| GND1 | Primary-side ground | Reference for input-side logic, PWM control, and transformer primary drive |
| VIA, VIB, VIC, VID | Input data channels A–D | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V, VIH = 1.6 V min @ 3.3 V) |
| VOA, VOB, VOC, VOD | Output data channels A–D | CMOS outputs driving isolated side; VOH = VISO − 0.3 V, VOL = 0.4 V max @ 4 mA |
| VDD2 | Secondary-side supply | Internal 5.0 V LDO output (4.6–5.7 V) powering output-side logic and feedback circuitry |
| VREG | Regulated isolated output | Adjustable 3.3–24 V via external resistor divider; feedback setpoint = 1.25 V ±10% |
| FB | Feedback input | Connects to resistor divider midpoint; internal 10 µA current sink sets VISO = 1.25 × (R1+R2)/R2 |
| ROC | Oscillator frequency control | Resistor-to-ground sets fSW: 200 kHz (270 kΩ) to 1 MHz (50 kΩ) |
| GND2 | Secondary-side ground | Isolated return for VDD2, VREG, and output-side logic; forms barrier with GND1 |
| NC | No connect | Pins 12, 13, 14, 15, 16, 17, 18, 19 are no-connect; must be left floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC-DC | Eliminates external isolated power supply; enables single-chip 2 W isolated bias + gate drive in motor controls |
| 25 Mbps C-grade isolation | Supports high-speed serial interfaces (e.g., isolated SPI, CAN FD physical layer signaling) without external buffers |
| Reinforced insulation | Meets VDE 0884-17 (560 V peak) and UL 1577 (2500 V rms) for safety-critical industrial and automotive systems |
| Pulse-by-pulse OCP | Prevents transformer saturation and MOSFET failure during short-circuit events on isolated output rail |
| Soft-start function | Reduces inrush current into output capacitors, avoiding input supply droop and transformer core reset issues |
Applications
| Industrial RS-485 Transceivers | Automotive Battery Management Systems |
|---|---|
|
Use Scenario: Isolating UART signals and power rails between MCU and RS-485 PHY in factory automation PLCs. IC Role / Device Role / Timing Role: Provides galvanically isolated 5 V power and four bidirectional data channels (TX/RX/DE/RE) across the barrier. Use Value: Enables 2500 V rms system-level isolation without discrete DC-DC + isolator combo, reducing BOM count by ≥3 components. |
Use Scenario: Signal and power isolation between high-voltage battery stack monitor ICs and low-voltage MCU in EV battery packs. IC Role / Device Role / Timing Role: Delivers reinforced-isolated 5 V supply and isolated analog monitoring/control signals (e.g., cell voltage, temperature, fault flags). Use Value: Meets automotive functional safety requirements (ASIL-B capable) with certified 560 V peak working voltage and 105°C operation. |
| Isolated Sensor Interfaces | Power Supply Start-up Bias |
|
Use Scenario: Isolating precision analog front-ends (e.g., strain gauge bridges, RTDs) from noisy digital domains in process instrumentation. IC Role / Device Role / Timing Role: Supplies clean, regulated 3.3 V isolated power to ADC drivers and provides isolated digital control lines (SPI clock/data/CS). Use Value: Achieves >25 kV/µs CMTI to reject fast transients from switching power supplies, preserving measurement integrity. |
Use Scenario: Generating initial start-up bias for main isolated DC-DC controller ICs in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Acts as auxiliary isolated supply generator using minimal external components (1 transformer, 2 resistors, 2 caps). Use Value: Reduces start-up time vs. optocoupler-based solutions due to integrated soft-start and fast 25 Mbps feedback channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated PWM controller + quad-channel isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4474CRIZ | Wider operating temp (−40°C to +125°C), higher VISO (5000 V rms), same 25 Mbps data rate and 2 W output | Better suited for under-hood automotive or high-temp industrial environments where 105°C limit is insufficient | Select ADUM4474CRIZ when extended temperature range or higher dielectric rating is required; pinout and footprint differ (20-lead SOIC-W) |
| SI88442ED-IS | 4-channel isolator + integrated DC-DC (1.5 W), 10 Mbps max data rate, 3750 V rms isolation, different PWM architecture | Limited to lower-speed interfaces (e.g., I²C, slow SPI); lacks adjustable oscillator and soft-start | Choose SI88442ED-IS for cost-sensitive, lower-power (<1.5 W), lower-data-rate applications where Analog Devices' iCoupler reliability is not mandatory |
Compared with ADUM3474CRSZ, ADUM4474CRIZ offers higher temperature and isolation ratings but requires PCB redesign, while SI88442ED-IS trades performance (10 Mbps, 1.5 W) for lower cost and simpler layout - making ADUM3474CRSZ optimal for balanced 25 Mbps/2 W industrial designs needing automotive qualification.
Availability
ADUM3474CRSZ is available at Aetrix Electronics and suitable for industrial field bus isolation, automotive battery management systems, and isolated sensor interfaces requiring stable component supply, long-term lifecycle support, and certified reinforced insulation.
Supply support for ADUM3474CRSZ 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 delivers integrated isolated power + signal solutions targeting space-constrained, safety-certified applications - specifically designed to replace discrete optocoupler + DC-DC combinations in RS-485, PLC, and BMS subsystems.
FAQ
What is the maximum isolated output voltage supported by ADUM3474CRSZ?
ADUM3474CRSZ supports an adjustable isolated output voltage range of 3.3 V to 24 V, set via 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 - e.g., 1% load regulation at 400 mA for 5 V output. Output ripple is specified at 50 mV p-p (20 MHz bandwidth) under 100 mA load.
Does ADUM3474CRSZ require an external transformer, and what are its key design parameters?
Yes, ADUM3474CRSZ requires an external center-tapped transformer for the isolated DC-DC stage. Key design parameters include ET constant (≥10 V·µs), primary inductance (≥100 µH), inter-winding isolation voltage (≥2500 V rms), and turns ratio selected based on input/output voltage combination - e.g., 1:1 for 5 V → 5 V, 1:3 for 5 V → 15 V. Transformer selection directly impacts efficiency, regulation, and EMI performance.
How does the ADUM3474CRSZ achieve 70% efficiency at full load?
ADUM3474CRSZ achieves 70% efficiency at 400 mA/5 V output through secondary-side regulation (eliminating optocoupler latency), low-RDS(on) integrated MOSFET switches (RON ≈ 0.5 Ω), and iCoupler transformer technology with low core loss. Efficiency includes quiescent power consumed by all four data channels - measured with full 25 Mbps traffic and capacitive loading per datasheet conditions.
Can ADUM3474CRSZ operate with a 3.3 V primary supply, and what is its output capability in that configuration?
Yes, ADUM3474CRSZ supports 3.3 V primary supply (VDD1 = 3.0–3.6 V) with 3.3 V isolated output (VISO = 3.0–3.6 V). In this mode, it delivers up to 250 mA at 70% efficiency. The feedback setpoint remains 1.25 V, and load regulation is 1–2% across 20–100 mA. Quiescent supply current drops to 12 mA (typical) at 25 Mbps, improving light-load efficiency.
What safety certifications apply to ADUM3474CRSZ, and how do they map to system-level requirements?
ADUM3474CRSZ holds UL 1577 (2500 V rms, 1 min), VDE 0884-17 (560 V peak reinforced), IEC/EN/CSA 62368-1, and CQC GB 4943.1 certifications. These enable compliance with end-equipment standards for industrial machinery (IEC 61800-5-1), automotive ECUs (ISO 26262), and medical devices (IEC 60601-1) - provided PCB layout meets minimum creepage (>5.3 mm) and clearance requirements per datasheet Table 7.
ADUM3474CRSZ 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:
- 0/4
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 60ns, 60ns
- Pulse Width Distortion (Max):
- 8ns
- 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
ADUM3474CRSZ FAQ
1.How can I place an order for ADUM3474CRSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3474CRSZ 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 ADUM3474CRSZ reliable?
The price and inventory of ADUM3474CRSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3474CRSZ is usually 5 days.
3.What payment methods are accepted for ADUM3474CRSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3474CRSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3474CRSZ?
ADUM3474CRSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3474CRSZ 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 ADUM3474CRSZ?
For technical support, including ADUM3474CRSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3474CRSZ requirements.
6.How does Aetrix verify that ADUM3474CRSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3474CRSZ 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 ADUM3474CRSZ meets industry standards.
7.What is the process for return or replacement of ADUM3474CRSZ?
All ADUM3474CRSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3474CRSZ, 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 ADUM3474CRSZ part is unused and in its original packaging.
Return procedure for ADUM3474CRSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM3474CRSZ Tags
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