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Analog Devices Inc. ADUM4474CRIZ
- Part No.:
- ADUM4474CRIZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADUM4474CRIZ.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,226
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Product details
Overview
ADUM4474CRIZ from Analog Devices is a quad-channel digital isolator with integrated isolated DC-DC switching regulator, delivering up to 2.5 W output power at 5 V input, supporting adjustable isolated output voltages from 3.3 V to 24 V, and featuring 25 Mbps data rate per channel with 5000 Vrms isolation for industrial power supply feedback loops.
For engineers reviewing the ADUM4474CRIZ datasheet, ADUM4474CRIZ pinout, ADUM4474CRIZ application, or ADUM4474CRIZ equivalent, this device serves as a complete isolated bias and signal interface solution-replacing optocouplers and discrete isolators in gate drive, sensor, and serial transceiver designs requiring high CMTI (>25 kV/µs) and regulated secondary-side power.
Technical Context
The ADUM4474CRIZ integrates a primary-side PWM controller with internal iCoupler® transformer-based feedback, eliminating external optocouplers and enabling stable regulation across 3.3–24 V isolated outputs. Its 20-lead SOIC package provides 8.3 mm creepage and supports 200 kHz–1 MHz adjustable switching frequency via ROC resistor.
All four isolation channels operate at 25 Mbps (CRIZ grade), with propagation delay ≤60 ns, pulse width distortion ≤8 ns, and channel-to-channel skew ≤15 ns for codirectional signals-enabling precise timing in synchronous interfaces like RS-485 or motor control gate drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 Vrms - meets reinforced insulation requirements for industrial safety standards (IEC 60747-5-5, DIN V VDE V 0884-10). |
| Max Data Rate | 25 Mbps - enables high-speed serial communication (e.g., isolated UART, SPI, or encoder interfaces) without timing bottlenecks. |
| Output Power | Up to 2.5 W - sufficient to power secondary-side microcontrollers, gate drivers, or transceivers without external DC-DC stages. |
| Regulated Output Range | 3.3 V to 24 V - configurable via external resistor divider on FB pin, supporting diverse load requirements including 5 V logic and 15 V gate drive rails. |
| CMTI | >25 kV/µs - ensures robust operation in noisy motor drives or power converters with fast voltage transients across isolation barrier. |
| Switching Frequency | 200 kHz to 1 MHz - adjustable via ROC resistor; higher frequencies reduce transformer size, lower frequencies improve efficiency at light loads. |
| Efficiency | Up to 80% - reduces thermal load and improves system-level power budget vs. unregulated isolated supplies. |
Pinout & Package
ADUM4474CRIZ uses a 20-lead wide-body SOIC package (SOIC_W) with 8.3 mm creepage distance and RoHS-compliant lead finish. Pin assignments are defined per Figure 6 (ADuM4474) in the Rev. 0 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side power input | Supplies 4.5–5.5 V to internal MOSFET driver and primary controller; powers transformer primary winding. |
| VDDA | Side 1 logic supply | Provides 3.3 V or 5 V to primary-side I/O buffers (CHA–CHD inputs); referenced to GND1. |
| GND1 | Primary-side ground | Return path for VDD1 and VDDA; forms isolation barrier reference for side 1 signals. |
| I/OA–I/OD | Primary-side data I/O | Four bidirectional CMOS-compatible channels; support 25 Mbps NRZ signaling with 40 ns min pulse width. |
| VDD2 | Secondary-side auxiliary supply | Internal 5 V LDO output (VREG) powers secondary-side logic; decoupled with 1 µF capacitor. |
| GND2 | Secondary-side ground | Return path for VDD2 and VISO; isolated reference for side 2 signals and loads. |
| VISO | Regulated isolated output | Adjustable 3.3–24 V output (via FB resistor divider); delivers up to 382 mA at 25 Mbps full-load operation. |
| FB | Feedback input | Senses VISO via resistor divider; sets output voltage as VISO = VFB × (R1 + R2)/R2, where VFB = 1.25 V (typ). |
| ROC | Oscillator frequency set | Resistor-connected pin sets fSW from 200 kHz to 1 MHz; determines transformer size and efficiency trade-off. |
| OC | Overcurrent fault flag | Open-drain output asserts low during pulse-by-pulse overcurrent event; requires pull-up for system monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PWM feedback loop | Eliminates optocoupler and external compensation components, reducing BOM count and layout complexity in isolated power supplies. |
| Soft-start function | Prevents inrush current during power-up, protecting transformer and secondary-side capacitors in high-capacitance loads. |
| Pulse-by-pulse overcurrent protection | Detects and limits peak switch current on every cycle, enabling safe operation under short-circuit or overload conditions. |
| Thermal shutdown | Disables switching when junction temperature exceeds ~150°C, preventing permanent damage during sustained overload or poor heatsinking. |
| High CMTI (>25 kV/µs) | Maintains signal integrity in high-dv/dt environments such as IGBT gate drivers or variable-frequency drives without data corruption. |
Applications
| Power Supply Start-Up Bias | Isolated Sensor Interface |
|---|---|
Use Scenario: Providing initial bias power and feedback signal to isolated flyback or forward converter controllers during cold start. IC Role / Device Role / Timing Role: ADUM4474CRIZ acts as both isolated power source (VISO) and feedback channel (CHA/CHB), replacing optocoupler + auxiliary winding. Use Value: Enables compact, single-chip start-up solution with <60 ns channel matching-critical for tight-loop stability in <1 ms ramp-up applications. | Use Scenario: Isolating analog sensor outputs (e.g., current shunt amplifiers, RTD bridges) in high-noise factory automation systems. IC Role / Device Role / Timing Role: ADUM4474CRIZ delivers isolated 5 V or 15 V rail (VISO) to sensor front-end while transmitting digitized data across barrier via CHC/CHD. Use Value: Eliminates ground loops and common-mode noise pickup; >25 kV/µs CMTI prevents measurement errors during ESD or switching transients. |
| Process Control I/O Module | RS-485 Transceiver Bias |
Use Scenario: Powering and isolating digital I/O expansion modules in PLC backplanes with mixed 3.3 V/5 V/24 V logic levels. IC Role / Device Role / Timing Role: ADUM4474CRIZ supplies regulated 3.3 V or 5 V (VISO) to local FPGA/MCU and isolates status/control signals across all four channels. Use Value: Single-package solution reduces PCB area by >40% vs. discrete isolator + DC-DC; 25 Mbps supports real-time diagnostics and firmware updates. | Use Scenario: Providing isolated 5 V bias and signal isolation for half-duplex RS-485 transceivers in motor drive cabinets. IC Role / Device Role / Timing Role: ADUM4474CRIZ powers transceiver VCC and isolates DE/RE control lines (CHA/CHB) plus differential data (CHC/CHD) with matched propagation delay. Use Value: Ensures simultaneous enable/disable of driver/receiver with <15 ns inter-channel skew-preventing bus contention and data loss. |
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 |
|---|---|---|---|
| ADUM4473CRIZ | Same package and architecture but rated for 384 mA max VISO load at 25 Mbps (vs. 382 mA for ADUM4474CRIZ); identical AC/DC specs. | Functionally interchangeable in all ADUM447xCRIZ applications; differs only in internal trimming for margin allocation. | Select ADUM4473CRIZ if legacy design validation exists; ADUM4474CRIZ offers latest production binning with tighter VISO load tolerance. |
| SI88442ED-IS | Quad-channel isolator + isolated DC-DC (3.3 V out, 0.5 W); no adjustable VISO, lower CMTI (15 kV/µs), different pinout. | Suitable for low-power, fixed-voltage applications (e.g., isolated CAN nodes) but cannot replace ADUM4474CRIZ in 15 V gate drive or 2.5 W sensor bias roles. | Choose SI88442ED-IS only when output voltage is fixed at 3.3 V and power demand is ≤500 mW; not drop-in compatible. |
Compared with ADUM4473CRIZ, ADUM4474CRIZ provides marginally tighter VISO load regulation at full 25 Mbps throughput; versus SI88442ED-IS, it delivers 5× more isolated power, 1.7× higher CMTI, and programmable output voltage-making it the sole choice for high-power, high-noise industrial feedback systems.
Availability
ADUM4474CRIZ is available at Aetrix Electronics and suitable for industrial motor drives, PLC I/O modules, and isolated sensor signal conditioning requiring stable component supply, long-term lifecycle assurance, and certified 5000 Vrms isolation.
Supply support for ADUM4474CRIZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The ADuM447x product line was designed specifically for integrated isolated power and signal transfer in industrial automation, offering regulated DC-DC conversion with galvanic isolation and high-speed digital channel capability in a single SOIC package.
FAQ
What is the maximum isolated output voltage supported by ADUM4474CRIZ?
ADUM4474CRIZ 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 (typ), and the output is regulated with ±2% load regulation across 50–200 mA. This range enables direct powering of 5 V microcontrollers, 12 V gate drivers, or 24 V industrial sensors without additional regulators.
Does ADUM4474CRIZ require an external transformer?
Yes, ADUM4474CRIZ requires an external push-pull transformer to generate the isolated output voltage. The IC integrates the primary-side MOSFET driver and PWM controller but does not include magnetic components. Transformer selection must meet specified turns ratio, ET constant, and isolation voltage (≥5000 Vrms) per the ADUM4474CRIZ datasheet Section "Transformer Design".
How does the 25 Mbps data rate of ADUM4474CRIZ compare to other grades in the ADuM447x family?
ADUM4474CRIZ is the highest-speed grade in the ADuM447x family, rated for 25 Mbps per channel. Lower grades (e.g., ARIZ) support only 1 Mbps. All CRIZ-grade variants share identical timing specs: 40 ns minimum pulse width, ≤60 ns propagation delay, and ≤15 ns channel-to-channel skew for codirectional signals-ensuring deterministic performance in time-critical interfaces.
Can ADUM4474CRIZ operate with a 3.3 V primary input supply?
Yes, ADUM4474CRIZ supports 3.3 V primary input (VDD1/VDDA = 3.0–3.6 V) with corresponding 3.3 V isolated output (VISO). In this configuration, it delivers up to 238 mA at 25 Mbps, maintains >25 kV/µs CMTI, and achieves 68% efficiency at full load. The feedback setpoint (1.25 V) and regulation accuracy remain unchanged across input voltage options.
What protection features are built into ADUM4474CRIZ?
ADUM4474CRIZ integrates pulse-by-pulse overcurrent protection, thermal shutdown (~150°C), soft-start, and undervoltage lockout (UVLO) on both VDDA and VDD2 supplies. The OC pin provides open-drain fault indication. These features protect the IC and external circuitry during startup, overload, short-circuit, or overheating events-eliminating need for external protection components in most industrial designs.
ADUM4474CRIZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- IsoPower®, iCoupler®
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 0/4
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 60ns, 60ns
- Pulse Width Distortion (Max):
- 6ns
- 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-SOIC-IC
ADUM4474CRIZ FAQ
1.How can I place an order for ADUM4474CRIZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM4474CRIZ 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 ADUM4474CRIZ reliable?
The price and inventory of ADUM4474CRIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM4474CRIZ is usually 5 days.
3.What payment methods are accepted for ADUM4474CRIZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM4474CRIZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM4474CRIZ?
ADUM4474CRIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM4474CRIZ 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 ADUM4474CRIZ?
For technical support, including ADUM4474CRIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM4474CRIZ requirements.
6.How does Aetrix verify that ADUM4474CRIZ is sourced from the original manufacturer or authorized distributors?
All ADUM4474CRIZ 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 ADUM4474CRIZ meets industry standards.
7.What is the process for return or replacement of ADUM4474CRIZ?
All ADUM4474CRIZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM4474CRIZ, 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 ADUM4474CRIZ part is unused and in its original packaging.
Return procedure for ADUM4474CRIZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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