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Analog Devices Inc. ADUM3470ARSZ
- Part No.:
- ADUM3470ARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3470ARSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
ADuM3470ARSZ 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 isolated 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 enables compact isolated power + signal transfer in industrial RS-485 transceivers.
For engineers reviewing the ADuM3470ARSZ datasheet, ADuM3470ARSZ pinout, ADuM3470ARSZ application, or ADuM3470ARSZ equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative options for isolated power and signal integrity designs.
Technical Context
The ADuM3470ARSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled flyback DC-DC converter. Its adjustable oscillator (200 kHz–1 MHz) drives an internal transformer driver with soft-start and pulse-by-pulse overcurrent protection.
It implements isolated feedback via internal VFB (1.25 V ±0.125 V) and supports output regulation across multiple configurations: 5 V input → 5 V/3.3 V/15 V isolated outputs, or 3.3 V input → 3.3 V output. High common-mode transient immunity (>25 kV/µs) and reinforced insulation (VIORM = 560 V peak) meet IEC/EN/CSA 62368-1 and DIN EN IEC 60747-17 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 V rms for 1 minute (UL 1577); VIORM = 560 V peak (reinforced) |
| Output Power | 2 W max, regulated 3.3–24 V output with 70% efficiency at 400 mA/5 V |
| Data Rate | 25 Mbps (C grade), NRZ, with 30–60 ns propagation delay and <8 ns pulse width distortion |
| Switching Frequency | Adjustable 200 kHz to 1 MHz via external resistor; typical 500 kHz operation |
| Operating Temperature | −40°C to +105°C ambient, with thermal shutdown at 150°C (20°C hysteresis) |
| Common-Mode Immunity | >25 kV/µs (measured at logic high/low outputs under 800 V transient) |
| Package | 20-lead SSOP (0.154" wide), θJA = 50.5°C/W on 4-layer board |
Pinout & Package
ADuM3470ARSZ 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. Pin 1–10 form the primary (input/VDD1) side; pins 11–20 form the isolated secondary (output/VISO/VDD2) side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | 5.0 V or 3.3 V input for logic and PWM controller; UVLO thresholds at 2.6 V/2.8 V |
| GND1 | Primary-side ground | Reference for input signals, PWM control, and primary-side logic |
| INA, INB, INC, IND | Input data channels | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V, 1.6 V @ 3.3 V); ±20 µA leakage |
| VDD2 | Secondary-side auxiliary supply | 5.0 V regulator output (4.6–5.7 V) for secondary logic; dropout ≤1.5 V at 50 mA |
| GND2 | Secondary-side ground | Reference for isolated outputs, VISO regulation, and secondary logic |
| OUTA, OUTB, OUTC, OUTD | Isolated output channels | CMOS outputs (VOH ≥ VISO − 0.3 V, VOL ≤ 0.4 V @ 4 mA); matched skew ≤15 ns (C grade) |
| VISO | Regulated isolated output | Adjustable 3.3–24 V via external resistor divider; VFB = 1.25 V ±0.125 V |
| ROC | Oscillator frequency set | Resistor from ROC to GND sets fSW: 200 kHz (270 kΩ) to 1 MHz (50 kΩ) |
| TRN | Transformer driver output | Push-pull driver for external transformer primary; RON = 0.5 Ω typical |
| FB | Feedback input | Connects to VISO divider midpoint; regulates output using internal 1.25 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated power + signal | Eliminates need for external isolated DC-DC converter in ≤2 W applications |
| Secondary-side regulation | Feedback loop closed on isolated side ensures tight load/line regulation without optocoupler |
| Pulse-by-pulse OCP | Prevents transformer saturation and MOSFET failure during short-circuit or overload events |
| Soft-start function | Controls inrush current during power-up to avoid input supply droop or transformer core reset issues |
| Reinforced safety certification | Meets UL 1577, IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and VDE 0884-17 standards |
Applications
| Industrial Field Bus Isolation | Isolated Sensor Interface |
|---|---|
Use Scenario: Galvanically isolating RS-485 transceivers in PLC backplanes or motor drives exposed to ground potential differences up to 1 kV. IC Role / Device Role / Timing Role: Provides both isolated 5 V power for transceiver IC and four bidirectional data channels for TX/RX/control signals. Use Value: Enables noise-immune communication in noisy factory environments while reducing BOM count by integrating power and isolation. |
Use Scenario: Connecting high-precision analog sensors (e.g., strain gauges, RTDs) to microcontrollers across hazardous voltage barriers in process instrumentation. IC Role / Device Role / Timing Role: Delivers clean, regulated 3.3 V isolated supply to sensor front-end and isolates ADC interface lines (SPI clock/data/CS). Use Value: Maintains signal integrity with >25 kV/µs CMTI and eliminates ground loops that cause offset drift in µV-level measurements. |
| Power Supply Start-up Bias | Automotive Battery Management |
Use Scenario: Generating initial bias voltage for gate drivers or controllers in offline SMPS before main converter starts, especially where auxiliary winding is impractical. IC Role / Device Role / Timing Role: Acts as self-contained isolated start-up supply with integrated transformer driver and regulation feedback. Use Value: Reduces design complexity versus discrete transformer + controller solutions; supports 105°C operation in enclosed power enclosures. |
Use Scenario: Isolating cell monitoring ICs from MCU in 48 V mild-hybrid battery packs where functional isolation is required per ISO 26262 ASIL-B. IC Role / Device Role / Timing Role: Supplies isolated 5 V to monitoring ICs and transfers voltage/current sampling data across barrier with <60 ns channel matching. Use Value: Meets reinforced insulation requirements (VIORM = 560 V peak) and automotive qualification (AEC-Q100 Grade 2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated power + signal isolation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADuM4470ARIZ | Wider input range (3.0–5.5 V), higher isolation rating (5000 V rms), 3.5 W output, 105°C operation | Supports higher power and stricter safety requirements (e.g., medical, grid-tie inverters) | Choose when >2 W isolated power or 5 kV rms rating is mandatory; larger 20-lead SOIC package |
| Si88440ED-IS | 4-channel isolator + integrated DC-DC (up to 2.5 W), 3.75 kV rms, 150 Mbps data rate, different pinout | Lacks secondary-side regulation; uses primary-side feedback requiring optocoupler or shunt | Prefer for ultra-high-speed digital interfaces; avoid if precise isolated output regulation is required |
Compared with ADuM3470ARSZ, ADuM4470ARIZ offers higher isolation and power but requires more PCB area, while Si88440ED-IS enables faster data rates but sacrifices regulated output accuracy and adds external feedback complexity.
Availability
ADuM3470ARSZ is available at Aetrix Electronics and suitable for industrial field bus isolation, isolated sensor interfaces, power supply start-up bias, and automotive battery management requiring stable component supply and long-term lifecycle support.
Supply support for ADuM3470ARSZ 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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The ADuM3470ARSZ belongs to the iCoupler® isolated power + signal family, designed to replace optocouplers and discrete isolated DC-DC solutions in space-constrained industrial and automotive systems.
FAQ
What is the maximum isolated output voltage supported by the ADuM3470ARSZ?
The ADuM3470ARSZ supports an adjustable isolated output voltage from 3.3 V to 24 V, set via an external resistor divider on the FB pin. The internal feedback reference is 1.25 V ±0.125 V, enabling precise regulation across this full range when paired with appropriate transformer turns ratio and output capacitor selection.
Does the ADuM3470ARSZ require an external transformer?
Yes, the ADuM3470ARSZ requires an external transformer connected to the TRN pin pair. It integrates only the primary-side driver and secondary-side regulation control - the transformer must be custom-wound or selected from Analog Devices' recommended list (e.g., Pulse Electronics PA0168.x series) to meet isolation, coupling, and ET constant requirements.
What safety certifications does the ADuM3470ARSZ hold?
The ADuM3470ARSZ holds 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) approvals. It is rated for reinforced insulation with VIORM = 560 V peak and meets material group I (CTI >600 V) requirements.
Can the ADuM3470ARSZ operate from a 3.3 V primary supply?
Yes, the ADuM3470ARSZ supports 3.0–3.6 V primary input (VDD1). In this mode, it delivers up to 250 mA at 3.3 V isolated output with 70% efficiency, and logic thresholds adjust accordingly (VIH = 1.6 V min, VIL = 0.4 V max). All four isolation channels remain fully functional at 25 Mbps (C grade).
How does the ADuM3470ARSZ achieve secondary-side regulation without an optocoupler?
The ADuM3470ARSZ closes the regulation loop on the isolated secondary side using its internal error amplifier and FB pin. The FB voltage is derived from the VISO output divider and compared to the 1.25 V reference. Control signals are sent across the isolation barrier via dedicated iCoupler® channels to adjust the primary-side PWM duty cycle - eliminating optocoupler latency and aging effects.
ADUM3470ARSZ 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:
- 4/0
- 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
ADUM3470ARSZ FAQ
1.How can I place an order for ADUM3470ARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3470ARSZ 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 ADUM3470ARSZ reliable?
The price and inventory of ADUM3470ARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3470ARSZ is usually 5 days.
3.What payment methods are accepted for ADUM3470ARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3470ARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3470ARSZ?
ADUM3470ARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3470ARSZ 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 ADUM3470ARSZ?
For technical support, including ADUM3470ARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3470ARSZ requirements.
6.How does Aetrix verify that ADUM3470ARSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3470ARSZ 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 ADUM3470ARSZ meets industry standards.
7.What is the process for return or replacement of ADUM3470ARSZ?
All ADUM3470ARSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3470ARSZ, 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 ADUM3470ARSZ part is unused and in its original packaging.
Return procedure for ADUM3470ARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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