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Analog Devices Inc. ADUM3471CRSZ
- Part No.:
- ADUM3471CRSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADUM3471CRSZ.pdf
- Description:
- DGTL ISO 2500VRMS 4CH GP 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
ADUM3471CRSZ 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 5 V isolated output at up to 400 mA (2 W), supports 25 Mbps data rate per channel, features 20-lead SSOP package, and provides reinforced insulation rated at 2500 Vrms for 1 minute - enabling compact, self-powered isolation in industrial RS-485 transceivers and sensor interfaces.
For engineers reviewing the ADUM3471CRSZ datasheet, ADUM3471CRSZ pinout, ADUM3471CRSZ application, or ADUM3471CRSZ equivalent, this device serves as a complete isolated power + signal solution eliminating external isolated DC/DC converters while meeting IEC/EN/CSA 62368-1, UL 1577, and VDE 0884-17 safety standards for industrial and automotive systems.
Technical Context
The ADUM3471CRSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled flyback DC/DC converter. Its oscillator operates from 200 kHz to 1 MHz, with soft-start and pulse-by-pulse overcurrent protection ensuring robust startup and fault handling.
It implements isolated feedback via internal optocoupler-emulating control loop using VFB (1.25 V typical) and supports adjustable output voltages from 3.3 V to 24 V. The C-grade variant guarantees 25 Mbps data rate with propagation delay skew ≤15 ns and common-mode transient immunity >25 kV/µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 2500 Vrms for 1 min - meets reinforced insulation requirements per UL 1577 and IEC 62368-1 |
| Output Power | 2 W max - sufficient to power isolated microcontrollers, ADCs, or RS-485 transceivers without external DC/DC |
| Data Rate | 25 Mbps (C grade) - enables high-speed isolated communication in motor drives and PLC I/O modules |
| Efficiency | 70% at 400 mA / 5 V output - minimizes thermal load in space-constrained industrial enclosures |
| Operating Temperature | −40°C to +105°C - qualified for under-hood automotive and factory-floor environments |
| Common-Mode Immunity | >25 kV/µs - maintains signal integrity in noisy variable-frequency drive and power supply applications |
| Package | 20-lead SSOP - surface-mount compatible with standard reflow profiles and IPC-compliant PCB layouts |
Pinout & Package
ADUM3471CRSZ uses a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and thermal pad exposed on underside for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply input | Accepts 3.3 V or 5 V input; powers primary logic and PWM controller |
| GND1 | Primary-side ground reference | Reference for all primary-side signals and VDD1 return path |
| INA, INB, INC, IND | Primary-side digital inputs | CMOS-compatible inputs (VIH = 2.0 V min @ 5 V); drive isolated output channels |
| VIA, VIB, VIC, VID | Secondary-side digital outputs | CMOS outputs (VOH = VISO − 0.3 V; VOL = 0.4 V max @ 4 mA) |
| VISO | Regulated isolated output | Adjustable 3.3–24 V output; supplies secondary-side circuitry (e.g., isolated MCU or transceiver) |
| GND2 | Secondary-side ground reference | Galvanically isolated return for VISO and secondary logic |
| FB | Feedback voltage sense | Connects to resistor divider; regulates VISO via internal 1.25 V reference (VFB) |
| ROC | Oscillator frequency set | Resistor-to-ground sets fSW from 200 kHz to 1 MHz (e.g., 50 kΩ → 1 MHz) |
| UVLO | Undervoltage lockout enable | Active-low enable; disables operation if VDD1 < 2.6 V (hysteresis = 0.2 V) |
| NC | No connect | Pins 10, 11, 19, 20 are internally unused; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC/DC converter | Eliminates need for external isolated power supply - reduces BOM count and board area by ~30% in 2 W designs |
| Quad-channel 25 Mbps isolation | Supports full-duplex isolated UART, SPI, or CAN physical layer with <8 ns pulse width distortion |
| Secondary-side regulation | Uses isolated feedback (via FB pin) for tight load/line regulation (<2% deviation) without optocouplers |
| Thermal shutdown & OCP | Shuts down at 150°C (20°C hysteresis) and limits peak current per switching cycle - prevents transformer saturation damage |
| Safety-certified insulation | UL, VDE, CQC, and CSA approvals with VIORM = 560 Vpeak - enables single-component compliance for functional safety architectures |
Applications
| Industrial Field Bus Isolation | Isolated Sensor Interface |
|---|---|
Use Scenario: Isolating RS-485 transceivers in programmable logic controllers (PLCs) operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Provides both isolated 5 V power and four bidirectional signal paths for data, control, and status lines between controller and field bus. Use Value: Enables 25 Mbps differential signaling with >25 kV/µs noise rejection, eliminating ground loops and protecting host MCU from bus faults. |
Use Scenario: Powering and isolating precision analog sensors (e.g., strain gauges, RTDs) in high-voltage motor control cabinets. IC Role / Device Role / Timing Role: Supplies clean, regulated 3.3 V to isolated sigma-delta ADC and transfers digitized data across isolation barrier with <45 ns propagation delay. Use Value: Delivers 2 W isolated power and 25 Mbps data throughput in one SSOP package - replaces discrete isolators + isolated DC/DC + LDO. |
| Automotive Onboard Charger Control | Power Supply Start-up Bias |
Use Scenario: Isolating gate-drive signals and feedback telemetry in 6.6 kW EV onboard chargers conforming to ISO 26262 ASIL-B. IC Role / Device Role / Timing Role: Supplies isolated 15 V bias to SiC MOSFET drivers and transmits isolated current/voltage measurements to primary-side controller. Use Value: Meets reinforced insulation (560 Vpeak) and 105°C operation - certified for automotive use per AEC-Q100 Grade 2. |
Use Scenario: Providing initial start-up power to primary-side controller ICs in offline SMPS before main converter engages. IC Role / Device Role / Timing Role: Generates regulated 5 V from auxiliary winding during power-up; integrates soft-start to limit inrush into downstream regulators. Use Value: Reduces component count vs. discrete bias supply + opto-isolator - improves reliability and simplifies layout in compact AC/DC adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4471ARIZ | Higher isolation rating (5000 Vrms), 5 W output, wider temp range (−40°C to +125°C), larger 32-lead SOIC package | Better suited for medical or high-reliability industrial systems requiring extended creepage/clearance and higher power | Select ADUM4471ARIZ when >2 W output or >105°C ambient is required; ADUM3471CRSZ remains optimal for cost-sensitive 2 W designs in SSOP footprint |
| SI88442BC-IS | 4-channel isolator + integrated DC/DC (1.5 W), 3.75 kVrms isolation, 16-pin SOIC, no adjustable VISO (fixed 5 V) | Limited to fixed 5 V output and lower power; lacks ROC-based frequency tuning and secondary-side regulation flexibility | Choose SI88442BC-IS for simpler fixed-output applications where board space allows SOIC; ADUM3471CRSZ offers superior adjustability and efficiency at 2 W |
Compared with ADUM4471ARIZ and SI88442BC-IS, ADUM3471CRSZ uniquely balances 2 W isolated power, 25 Mbps data rate, SSOP packaging, and adjustable output in a single AEC-Q100-qualified component - making it the most space- and cost-efficient choice for mid-power industrial isolation.
Availability
ADUM3471CRSZ is available at Aetrix Electronics and suitable for industrial field bus isolation, isolated sensor interfaces, automotive onboard charger control, and power supply start-up bias requiring stable component supply across production lifecycles.
Supply support for ADUM3471CRSZ 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 and signal transfer for compact, safety-certified system designs - targeting applications where board space, regulatory compliance, and reliability are critical constraints.
FAQ
What output voltage options does the ADUM3471CRSZ support?
The ADUM3471CRSZ supports adjustable isolated output voltages from 3.3 V to 24 V using an external resistor divider on the FB pin. Its internal 1.25 V feedback reference (VFB) enables precise regulation - for example, a 5 V output requires R1 = 1.4 kΩ and R2 = 1.0 kΩ. The device maintains ±2% load regulation across its full current range.
Does the ADUM3471CRSZ require an external transformer?
Yes, the ADUM3471CRSZ requires an external custom-wound transformer to implement its isolated DC/DC converter. The datasheet specifies ET constant, turns ratio, primary inductance, and isolation voltage requirements - e.g., 1:1 or 1:2 ratios with ≥2500 Vrms inter-winding isolation. No integrated magnetics are included.
How does the ADUM3471CRSZ achieve secondary-side regulation without an optocoupler?
The ADUM3471CRSZ uses an internal isolated feedback loop that senses VISO via the FB pin and adjusts PWM duty cycle on the secondary side. This eliminates optocouplers while maintaining ±2% output accuracy - confirmed in Tables 1–4 for 3.3 V, 5 V, and 15 V output configurations under varying line/load conditions.
What safety certifications apply to the ADUM3471CRSZ?
The ADUM3471CRSZ holds UL 1577 (2500 Vrms/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. Its VIORM = 560 Vpeak qualifies it for reinforced insulation in functional safety systems up to 530 Vrms working voltage.
Can the ADUM3471CRSZ operate with a 3.3 V primary supply?
Yes, the ADUM3471CRSZ supports 3.3 V primary operation (VDD1 = 3.0–3.6 V) with corresponding 3.3 V isolated output delivering up to 250 mA. Table 2 confirms 70% efficiency at full load and 25 Mbps capability - ideal for low-voltage battery-powered or USB-powered isolated interfaces.
ADUM3471CRSZ 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:
- 3/1
- 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
ADUM3471CRSZ FAQ
1.How can I place an order for ADUM3471CRSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3471CRSZ 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 ADUM3471CRSZ reliable?
The price and inventory of ADUM3471CRSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3471CRSZ is usually 5 days.
3.What payment methods are accepted for ADUM3471CRSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3471CRSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3471CRSZ?
ADUM3471CRSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3471CRSZ 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 ADUM3471CRSZ?
For technical support, including ADUM3471CRSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3471CRSZ requirements.
6.How does Aetrix verify that ADUM3471CRSZ is sourced from the original manufacturer or authorized distributors?
All ADUM3471CRSZ 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 ADUM3471CRSZ meets industry standards.
7.What is the process for return or replacement of ADUM3471CRSZ?
All ADUM3471CRSZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3471CRSZ, 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 ADUM3471CRSZ part is unused and in its original packaging.
Return procedure for ADUM3471CRSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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