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Analog Devices Inc. ADUM3470ARSZ-RL7
- Part No.:
- ADUM3470ARSZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3470ARSZ-RL7.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
ADUM3470ARSZ-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), features 20-lead SSOP package, and provides 25 kV/µs common-mode transient immunity. It enables compact isolated power + signal transfer in industrial RS-485 transceivers.
For engineers reviewing the ADUM3470ARSZ-RL7 datasheet, ADUM3470ARSZ-RL7 pinout, ADUM3470ARSZ-RL7 application, or ADUM3470ARSZ-RL7 equivalent, key selection criteria include isolated output voltage adjustability (3.3–24 V), guaranteed 400 mA at 5 V output, 25 Mbps C-grade channel performance, thermal shutdown at 150°C, and UL/VDE-reinforced insulation compliance.
Technical Context
The ADUM3470ARSZ-RL7 integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled PWM controller driving an external transformer. Its oscillator frequency is adjustable from 200 kHz to 1 MHz via external resistor, enabling optimization of transformer size and efficiency.
It implements pulse-by-pulse overcurrent protection, soft-start at power-up, and undervoltage lockout (2.6 V/2.8 V hysteresis) on both primary (VDD1) and secondary (VDD2) supplies. The feedback voltage setpoint is fixed at 1.25 V ±0.125 V, allowing precise regulation of isolated output voltage using external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolated Output Voltage Range | 3.3 V to 24 V - Adjustable via external resistor divider; enables single part to support multiple system rail requirements. |
| Max Output Power | 2 W - Sufficient to power isolated gate drivers, sensor front-ends, or microcontrollers without external DC-DC. |
| Efficiency | 70% at 400 mA / 5.0 V - Measured under guaranteed load; reduces heat generation in thermally constrained designs. |
| Data Rate (C Grade) | 25 Mbps - Supports high-speed industrial communication (e.g., isolated SPI, CAN FD physical layer interfaces). |
| Common-Mode Transient Immunity | >25 kV/µs - Ensures robust operation in noisy motor drive or factory automation environments with fast-switching power electronics. |
| Regulatory Approvals | UL 1577 (2500 V rms), VDE 0884-17 (560 V peak reinforced), IEC 62368-1 - Certified for safety-critical industrial and automotive applications. |
| Operating Temperature | −40°C to +105°C - Qualified for under-hood automotive and extended-temperature industrial control systems. |
Pinout & Package
ADUM3470ARSZ-RL7 is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for high-density PCB layouts and automated assembly. The package provides reinforced insulation barrier between primary-side (pins 1–10) and secondary-side (pins 11–20) circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply input | Accepts 3.3 V or 5.0 V input; powers internal logic and PWM controller; UVLO threshold 2.6 V/2.8 V. |
| GND1 | Primary-side ground reference | Return path for VDD1 and input-side I/O channels; must be separated from GND2 by isolation barrier. |
| INA, INB, INC, IND | Primary-side digital input channels | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V); support DC–25 Mbps (C grade); low input leakage (±20 µA). |
| VISO | Isolated output voltage node | Regulated output (3.3–24 V); supplies external loads up to 400 mA at 5 V; connects to transformer secondary and feedback network. |
| VFB | Feedback input for output regulation | Connects to resistor divider from VISO; internal 1.25 V reference sets output voltage as VISO = 1.25 × (1 + R1/R2). |
| ROC | Oscillator frequency setting | Resistor-to-ground sets fSW from 200 kHz to 1 MHz; higher frequency allows smaller magnetics but increases switching loss. |
| OUTA, OUTB, OUTC, OUTD | Secondary-side digital output channels | CMOS outputs referenced to VISO/GND2; VOH = VISO − 0.3 V (min), VOL = 0.4 V (max @ 4 mA); matched propagation delay (≤8 ns PWD). |
| GND2 | Secondary-side ground reference | Return for VISO, VDD2, and output-side I/O; galvanically isolated from GND1; forms safety barrier per IEC 60747-17. |
| VDD2 | Secondary-side auxiliary supply | Internal LDO output (5.0 V ±0.4 V) powered from VISO; supplies secondary logic; dropout ≤1.5 V @ 50 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PWM controller + transformer driver | Eliminates need for discrete isolated DC-DC IC and external gate drivers; reduces BOM count and layout area by >40% vs. discrete solutions. |
| Quad-channel isolation (25 Mbps, C grade) | Supports full-duplex isolated communication (e.g., RS-485 TX/RX + control/status lines) with <15 ns channel-to-channel skew. |
| Reinforced insulation (560 V peak VIORM) | Meets reinforced insulation requirements per VDE 0884-17 and IEC 62368-1 for functional safety in 250 VAC mains-connected equipment. |
| Soft-start and thermal shutdown | Prevents inrush current damage during power-up; shuts down at 150°C junction temperature with 20°C hysteresis for reliable fault recovery. |
| Pulse-by-pulse overcurrent protection | Detects transformer saturation or short-circuit events cycle-by-cycle; limits peak primary current to prevent MOSFET failure. |
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 working voltage compliance while delivering 400 mA at 5 V-sufficient to power MAX1487E or SN65HVD7x transceivers directly. |
Use Scenario: Isolating cell voltage monitoring and balancing control signals between battery pack and MCU in EV traction inverters. IC Role / Device Role / Timing Role: Supplies isolated 3.3 V power and transfers ADC readouts, fault flags, and balance enable signals across high dv/dt domains. Use Value: Withstands >25 kV/µs transients from IGBT switching; operates reliably at 105°C ambient; meets automotive AEC-Q100 stress test requirements. |
| Process Control Sensor Interfaces | Isolated Gate Driver Bias Supply |
|
Use Scenario: Powering and isolating 4–20 mA loop-powered sensors in hazardous-area field instruments. IC Role / Device Role / Timing Role: Generates isolated 15 V output (via external transformer) to bias 2-wire transmitter ICs while transferring diagnostic data. Use Value: Delivers 100 mA at 15 V with 70% efficiency; eliminates need for separate isolated bias supply; maintains <2% load regulation from 20–100 mA. |
Use Scenario: Providing isolated gate drive power and level-shifted PWM signals to SiC MOSFET half-bridges in solar inverters. IC Role / Device Role / Timing Role: Supplies 12 V isolated bias to gate driver ICs (e.g., ISO5852S) and transmits dead-time-controlled PWM with <8 ns pulse width distortion. Use Value: Matches tight timing specs of high-frequency SiC switching (100+ kHz); reduces propagation delay skew to ≤8 ns between channels for accurate phase alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated PWM controller + digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4470ARIZ-RL7 | Higher isolation rating (5000 V rms), wider temp range (−40°C to +125°C), same pinout and function; requires larger transformer due to higher VISO test voltage. | Better suited for medical equipment or grid-tied inverters requiring enhanced creepage/clearance (>8 mm). | Select when UL 1577 5000 V rms or extended temperature operation is mandatory; otherwise ADUM3470ARSZ-RL7 offers lower cost and footprint. |
| SI88642EC-IS | Four-channel isolator + integrated DC-DC (1.5 W), 10 Mbps max data rate, different pinout (20-pin SOIC-W), no adjustable oscillator. | Lower power and speed; simpler design for cost-sensitive 3.3 V/5 V systems where 25 Mbps is unnecessary. | Choose for legacy 1 Mbps designs or where board space allows SOIC-W; avoid if 25 Mbps or programmable fSW is required. |
Compared with ADUM4470ARIZ-RL7 and SI88642EC-IS, the ADUM3470ARSZ-RL7 uniquely balances 25 Mbps speed, 2 W output, and 20-lead SSOP compactness-making it optimal for space-constrained industrial gate drivers and high-speed sensor interfaces where regulatory overhead and cost must be minimized.
Availability
ADUM3470ARSZ-RL7 is available at Aetrix Electronics and suitable for industrial field bus isolation, isolated sensor interfaces, and automotive battery management systems requiring stable component supply and long-term lifecycle support.
Supply support for ADUM3470ARSZ-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.
The ADuM347x family was designed to integrate isolated power and signal transfer into a single IC for compact, certified, and reliable industrial interface modules-reducing design complexity versus discrete transformer + isolator + regulator solutions.
FAQ
What output voltage ranges does the ADUM3470ARSZ-RL7 support?
The ADUM3470ARSZ-RL7 supports an isolated output voltage range of 3.3 V to 24 V, set externally via a resistor divider connected to the VFB pin. The internal feedback reference is 1.25 V ±0.125 V, enabling precise regulation across this range. For example, a 5.0 V output requires R1/R2 = 3.0; a 15 V output requires R1/R2 = 11.0. The ADUM3470ARSZ-RL7 maintains ≤2% load regulation from 50 mA to 400 mA at 5 V.
Does the ADUM3470ARSZ-RL7 require an external transformer?
Yes, the ADUM3470ARSZ-RL7 requires an external transformer to implement the isolated DC-DC converter. It integrates the PWM controller and secondary-side synchronous rectifier driver, but the magnetic component must be selected based on output voltage, current, and switching frequency. Analog Devices provides detailed guidelines for ET constant, turns ratio, and primary inductance in the datasheet's Transformer Design section.
What is the maximum data rate supported by the ADUM3470ARSZ-RL7?
The ADUM3470ARSZ-RL7 supports up to 25 Mbps per channel in C-grade versions (indicated by 'C' in ordering code), with typical propagation delay of 30–60 ns and pulse width distortion ≤8 ns. A-grade variants are limited to 1 Mbps. The ADUM3470ARSZ-RL7 datasheet confirms 25 Mbps operation at CL = 15 pF and f = 12.5 MHz, meeting requirements for isolated SPI, RS-422, and digital encoder interfaces.
How does the ADUM3470ARSZ-RL7 handle overcurrent conditions?
The ADUM3470ARSZ-RL7 implements pulse-by-pulse overcurrent protection that monitors primary-side switch current each cycle. When overcurrent is detected, the PWM output is disabled for that cycle only-allowing continued operation under transient overload while preventing MOSFET destruction. This differs from latch-off protection and ensures robustness during inrush or short-circuit events on the VISO rail.
Is the ADUM3470ARSZ-RL7 qualified for automotive applications?
Yes, the ADUM3470ARSZ-RL7 is explicitly qualified for automotive applications per the datasheet's Automotive Products section. It operates from −40°C to +105°C, meets AEC-Q100 stress testing requirements, and carries safety certifications including IEC/EN/CSA 62368-1 and DIN EN IEC 60747-17 (VDE 0884-17), making it suitable for battery management, charging control, and isolated CAN/FlexRay interfaces in vehicles.
ADUM3470ARSZ-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:
- 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-RL7 FAQ
1.How can I place an order for ADUM3470ARSZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3470ARSZ-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 ADUM3470ARSZ-RL7 reliable?
The price and inventory of ADUM3470ARSZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3470ARSZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADUM3470ARSZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3470ARSZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3470ARSZ-RL7?
ADUM3470ARSZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3470ARSZ-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 ADUM3470ARSZ-RL7?
For technical support, including ADUM3470ARSZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3470ARSZ-RL7 requirements.
6.How does Aetrix verify that ADUM3470ARSZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADUM3470ARSZ-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 ADUM3470ARSZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADUM3470ARSZ-RL7?
All ADUM3470ARSZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3470ARSZ-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 ADUM3470ARSZ-RL7 part is unused and in its original packaging.
Return procedure for ADUM3470ARSZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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