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Analog Devices Inc. ADUM3474ARSZ-RL7
- Part No.:
- ADUM3474ARSZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3474ARSZ-RL7.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,652
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Product details
Overview
ADUM3474ARSZ-RL7 from Analog Devices is a quad-channel digital isolator with integrated PWM controller and transformer driver for isolated DC-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. It is used in RS-485 transceivers and industrial field bus isolation where compact, self-powered isolation is required.
For engineers reviewing the ADUM3474ARSZ-RL7 datasheet, ADUM3474ARSZ-RL7 pinout, ADUM3474ARSZ-RL7 application, or ADUM3474ARSZ-RL7 equivalent, key selection criteria include isolated output voltage range (3.3–24 V), 25 Mbps channel speed, 20-lead SSOP package compatibility, thermal shutdown behavior, and regulatory compliance with UL 1577, VDE 0884-17, and IEC 62368-1.
Technical Context
The ADUM3474ARSZ-RL7 integrates iCoupler® chip-scale transformers for signal isolation and a secondary-side-controlled transformer driver for high-efficiency isolated power generation. Its PWM controller features adjustable oscillator frequency (200 kHz–1 MHz), soft start, pulse-by-pulse overcurrent protection, and undervoltage lockout thresholds of 2.6 V/2.8 V.
All four isolation channels support bidirectional data transfer with <8 ns pulse width distortion (C grade), 30–60 ns propagation delay, and >25 kV/µs common-mode transient immunity. The device provides feedback-based regulation via internal 1.25 V reference (±10%) and supports external resistor programming of VISO across 3.3 V, 5 V, 15 V, and 24 V configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Channels | 4 independent unidirectional/bidirectional logic channels; enables full-duplex serial interface isolation without external buffers |
| Max Data Rate | 25 Mbps (C grade); supports high-speed UART, SPI, or digital sensor interfaces across isolation barrier |
| Isolated Output | Adjustable 3.3 V to 24 V; eliminates need for external isolated DC-DC converter in space-constrained designs |
| Output Power | 2 W max; sufficient to power downstream isolated logic, gate drivers, or small sensors |
| Efficiency | 70% at 400 mA / 5 V output; reduces thermal load and improves system-level power budgeting |
| Package | 20-lead SSOP (0.154" wide); compatible with standard surface-mount reflow processes and IPC-7351B footprint |
| Regulatory Approval | UL 1577 (2500 V rms), VDE 0884-17 (VIORM = 560 V peak), IEC 62368-1; certified for reinforced insulation in safety-critical systems |
| Operating Temp | −40°C to +105°C; qualified for automotive and industrial environments with extended thermal margin |
Pinout & Package
ADUM3474ARSZ-RL7 uses a 20-lead SSOP package (5.3 mm × 7.2 mm, 0.635 mm pitch) with creepage/clearance >5.3 mm between input and output sides per IEC 60747-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | 3.3 V or 5.0 V input for logic and PWM controller; powers input-side isolator channels and control circuitry |
| GND1 | Primary-side ground | Reference for VDD1 and input-side I/O; must be separated from GND2 by ≥5.3 mm for reinforced insulation |
| VIA, VIB, VIC, VID | Input data terminals | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V, 1.6 V @ 3.3 V); accept signals from MCU, FPGA, or transceiver TX lines |
| VOA, VOB, VOC, VOD | Output data terminals | CMOS outputs (VOH = VDD1 − 0.3 V, VOL = 0.4 V max); drive isolated-side logic, transceiver RX, or ADC/DAC interfaces |
| VDD2 | Secondary-side bias supply | 5.0 V internal LDO input; powers secondary-side isolator receivers and feedback circuitry when VISO ≠ 5 V |
| GND2 | Secondary-side ground | Reference for VISO, VDD2, and output-side I/O; galvanically isolated from GND1 |
| VISO | Regulated isolated output | Programmable 3.3–24 V supply; derived from transformer secondary and controlled via FB pin and external resistor divider |
| FB | Feedback input | Connects to resistor divider from VISO; sets output voltage via internal 1.25 V reference (VFB = 1.25 V ±10%) |
| ROC | Oscillator frequency set | Resistor-to-ground sets fSW from 200 kHz to 1 MHz; determines transformer size and EMI profile |
| EN | Enable control | Active-high logic input; disables PWM controller and isolator power to reduce quiescent current during standby |
Key Features
| Feature | Design Value |
|---|---|
| Integrated transformer driver with secondary-side control | Enables higher efficiency (>70%) and tighter regulation vs. primary-side-controlled topologies; reduces dependency on transformer tolerance |
| Soft start function | Prevents inrush current during power-up; avoids overshoot on VISO and stress on external transformer windings |
| Pulse-by-pulse overcurrent protection | Detects short-circuit or overload on transformer primary; limits duty cycle per switching cycle to prevent thermal runaway |
| Thermal shutdown with 20°C hysteresis | Shuts down at 150°C junction temperature and resumes only after cooling to 130°C; prevents permanent damage under sustained overload |
| iCoupler® transformer isolation | Eliminates optocoupler aging and CMTI limitations; achieves >25 kV/µs immunity and 10¹² Ω input-to-output resistance |
| Reinforced insulation certification | Meets VDE 0884-17 (VIORM = 560 V peak) and UL 1577 (2500 V rms) - enables single-component isolation in medical and industrial safety systems |
Applications
| Industrial Field Bus Isolation | RS-485 Transceiver Bias Supply |
|---|---|
|
Use Scenario: Isolating Modbus RTU nodes in factory automation networks with 24 V field power and noisy ground loops. IC Role / Device Role / Timing Role: Provides galvanic isolation for UART signals and generates 5 V isolated bias for RS-485 transceiver ICs (e.g., ADM3485). Use Value: Eliminates ground loop currents and common-mode noise coupling while powering transceiver logic and drivers from a single compact component. |
Use Scenario: Enabling isolated half-duplex RS-485 communication in motor drives where controller and actuator grounds differ by >100 V. IC Role / Device Role / Timing Role: Delivers 3.3 V or 5 V isolated supply to transceiver VCC and isolates DE/RE and DI/RO signal paths with matched propagation delay (<15 ns skew). Use Value: Reduces BOM count by replacing discrete isolators + isolated DC-DC, and ensures timing coherence across all four channels for synchronous protocol handling. |
| Automotive Battery Management | Isolated Sensor Interface |
|
Use Scenario: Isolating cell voltage monitoring circuits in 48 V mild-hybrid battery packs where high dv/dt and EMI require robust transient immunity. IC Role / Device Role / Timing Role: Supplies 3.3 V isolated power to precision ADC front-ends and isolates analog multiplexer control lines and status flags. Use Value: Achieves >25 kV/µs CMTI to reject switching noise from adjacent inverters, while maintaining <8 ns pulse width distortion for accurate timestamping. |
Use Scenario: Interfacing isolated pressure or temperature sensors in hydraulic control units exposed to 125°C ambient and 2 kV surge events. IC Role / Device Role / Timing Role: Powers sensor signal conditioning circuitry and isolates digital output (e.g., SPI clock/data) with guaranteed 105°C operation and reinforced insulation. Use Value: Meets AEC-Q100 Grade 1 requirements per datasheet; eliminates need for external isolated bias and reduces PCB area by >40% vs. discrete solution. |
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 | Higher isolation rating (5000 V rms), 4 W output, wider VISO range (3.3–24 V), but larger 24-lead SOIC package and higher quiescent current (55 mA vs. 18 mA) | Better suited for medical or high-voltage industrial systems requiring enhanced creepage; less optimal for space-constrained 5 V/2 W designs | Select ADUM4471ARIZ when reinforced isolation >3750 V rms or >3 W output is mandatory; ADUM3474ARSZ-RL7 remains preferred for cost-sensitive, compact 2 W applications. |
| SI88442ED-IS | 4-channel isolator + integrated DC-DC (2.5 W), 25 Mbps, but uses capacitive isolation (lower CMTI: 15 kV/µs) and lacks programmable VISO; fixed 5 V output only | Suitable for lower-noise environments (e.g., lab equipment), but not recommended for high-dv/dt motor drives or long cable runs with fast edges | Choose SI88442ED-IS for non-safety-critical, low-CMTI applications where fixed 5 V output suffices; ADUM3474ARSZ-RL7 offers superior noise immunity and design flexibility via VISO adjustment. |
Compared with ADUM4471ARIZ and SI88442ED-IS, ADUM3474ARSZ-RL7 delivers optimal balance of size (20-SSOP), programmable output voltage, 25 Mbps speed, and 25 kV/µs CMTI - making it the most suitable choice for industrial field buses and automotive BMS where board space, regulation flexibility, and transient robustness are jointly critical.
Availability
ADUM3474ARSZ-RL7 is available at Aetrix Electronics and suitable for industrial field bus isolation, RS-485 transceiver biasing, automotive battery management, and isolated sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for ADUM3474ARSZ-RL7 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 since 1965.
ADUM3474ARSZ-RL7 belongs to the iCoupler® ADuM347x family - engineered to replace optocouplers and discrete isolated power solutions in compact, high-reliability systems demanding integrated signal + power isolation.
FAQ
What is the maximum isolated output voltage supported by ADUM3474ARSZ-RL7?
ADUM3474ARSZ-RL7 supports an isolated output voltage range of 3.3 V to 24 V, set externally via the FB pin and a resistor divider. The internal feedback reference is 1.25 V ±10%, enabling precise regulation across this range. At 15 V output, maximum load is 100 mA; at 5 V, it delivers up to 400 mA - all while maintaining 70% efficiency and thermal shutdown protection.
Does ADUM3474ARSZ-RL7 support both 3.3 V and 5 V primary-side input supplies?
Yes, ADUM3474ARSZ-RL7 operates with either 3.3 V (3.0–3.6 V) or 5.0 V (4.5–5.5 V) primary-side input. Input supply voltage affects available VISO load current: at 5 V input, it delivers up to 400 mA at 5 V output; at 3.3 V input, max is 250 mA at 3.3 V output. Both configurations retain 25 Mbps data rate, soft start, and overcurrent protection functionality.
How does the oscillator frequency adjustment work on ADUM3474ARSZ-RL7?
ADUM3474ARSZ-RL7 uses an external resistor (ROC) connected from the ROC pin to GND1 to set switching frequency between 200 kHz and 1 MHz. A 50 kΩ resistor yields ~1 MHz; 270 kΩ yields ~200 kHz. This allows optimization of transformer size, EMI profile, and efficiency - critical for meeting CISPR 25 Class 5 in automotive applications or minimizing conducted emissions in industrial settings.
What safety certifications apply to ADUM3474ARSZ-RL7?
ADUM3474ARSZ-RL7 carries UL 1577 (2500 V rms, 1 min), VDE 0884-17 (reinforced insulation, VIORM = 560 V peak), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1 approvals. These enable its use in safety-critical systems including industrial PLCs and automotive BMS without requiring additional isolation barriers or derating for working voltage.
Can ADUM3474ARSZ-RL7 drive an external MOSFET gate directly?
No, ADUM3474ARSZ-RL7 does not provide high-current gate drive capability. Its VOA–VOD outputs are CMOS logic drivers (4 mA sink/source), intended for signal-level isolation only. For isolated gate driving, the device's VISO output can power a dedicated isolated gate driver IC (e.g., ADUM4120), while ADUM3474ARSZ-RL7 handles PWM signal isolation and bias generation.
ADUM3474ARSZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
ADUM3474ARSZ-RL7 FAQ
1.How can I place an order for ADUM3474ARSZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3474ARSZ-RL7 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 ADUM3474ARSZ-RL7 reliable?
The price and inventory of ADUM3474ARSZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3474ARSZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADUM3474ARSZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3474ARSZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3474ARSZ-RL7?
ADUM3474ARSZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3474ARSZ-RL7 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 ADUM3474ARSZ-RL7?
For technical support, including ADUM3474ARSZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3474ARSZ-RL7 requirements.
6.How does Aetrix verify that ADUM3474ARSZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADUM3474ARSZ-RL7 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 ADUM3474ARSZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADUM3474ARSZ-RL7?
All ADUM3474ARSZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3474ARSZ-RL7, 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 ADUM3474ARSZ-RL7 part is unused and in its original packaging.
Return procedure for ADUM3474ARSZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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