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Analog Devices Inc./Maxim Integrated MAX14431FASE+
- Part No.:
- MAX14431FASE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX14431FASE+.pdf
- Description:
- 4-CHANNEL, LOW POWER, 3.75KV DIG
- Quantity:
- Payment:
- Shipping:
Inventory:2,244
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Product details
Overview
The MAX14431FASE+ from Analog Devices is a 4-channel, unidirectional, fast digital galvanic isolator in a 16-pin narrow SOIC package with 3.75kVRMS isolation rating (60s), 200Mbps max data rate, and default-low output logic. It operates across dual independent 1.71V–5.5V supplies and supports isolated RS-485, SPI, and industrial fieldbus interfaces requiring high CMTI and low power at 1.8V.
For engineers reviewing the MAX14431FASE+ datasheet, MAX14431FASE+ pinout, MAX14431FASE+ application, or MAX14431FASE+ equivalent, this device is selected for high-speed, safety-certified isolation in battery management systems, medical equipment, and industrial automation where VIOWM = 445VRMS, CMTI ≥ 50kV/μs, and ambient operation up to +125°C are critical.
Technical Context
The MAX14431FASE+ implements capacitive-based galvanic isolation with proprietary process technology, enabling signal transfer across isolated power domains without ground loops. Its architecture supports active-low output enable and default-low output state, ensuring predictable fail-safe behavior during input loss or power-down.
It delivers 200Mbps data rate with propagation delay as low as 4.1ns (tPLH, VDD ≥ 4.5V) and pulse width distortion under 2ns, while maintaining 50kV/μs common-mode transient immunity - critical for noisy motor drive and PLC backplane environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3.75kVRMS for 60s - qualifies for reinforced insulation per UL1577 and CSA Bulletin 5A in narrow SOIC package. |
| Max Data Rate | 200Mbps - enables high-speed serial links such as isolated SPI clock/data paths or fast digital I/O in real-time control. |
| CMTI | 50kV/μs typical - suppresses false triggering in high dv/dt environments like inverters and servo drives. |
| Supply Range | 1.71V to 5.5V on both sides - allows level translation between 1.8V microcontrollers and 3.3V/5V peripherals. |
| Output Default State | Low - ensures safe deactivation of downstream drivers (e.g., gate drivers, transceivers) during power-up or fault. |
| Operating Temp | -40°C to +125°C - supports deployment in under-hood automotive modules and industrial edge controllers. |
| Power @ 1Mbps | 1.1mW per channel at 3.3V - reduces thermal load in dense PCB layouts and extends battery life in portable medical devices. |
Pinout & Package
Package: 16-pin narrow-body SOIC (package code S16MS+12), 4mm creepage/clearance, CTI > 600 (Group I).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Side A primary supply | Provides power to input-side logic and isolation transmitter; accepts 1.71V–5.5V. |
| GNDA | Side A ground reference | Return path for Side A signals; galvanically isolated from GNDB. |
| IN1–IN4 | Digital inputs (Side A) | Accept CMOS/LVTTL logic; support 1.71V–5.5V VDDA-compatible thresholds. |
| ENA | Active-low enable (Side A) | Disables all Side A outputs when pulled high; enables transmission when low. |
| VDDB | Side B primary supply | Power for output-side logic and receiver; independent 1.71V–5.5V domain. |
| GNDB | Side B ground reference | Return for Side B outputs; isolated from GNDA to maintain barrier integrity. |
| OUT1–OUT4 | Digital outputs (Side B) | Default-low CMOS outputs; sink/source up to 4mA; fail-safe low on input loss. |
| ENB | Active-low enable (Side B) | Controls output-side driver enable; synchronized with ENA for bidirectional flow control. |
Key Features
| Feature | Design Value |
|---|---|
| 200Mbps data rate | Enables full-duplex isolated SPI at ≥20MHz clock rates without timing margin violation. |
| 50kV/μs CMTI | Prevents metastability in motor control feedback loops exposed to 600V bus switching transients. |
| Fail-safe default-low outputs | Guarantees OFF-state for connected MOSFET gates or RS-485 drivers during brown-out or reset. |
| 3.75kVRMS isolation (SOIC) | Meets reinforced insulation requirements for medical (IEC 60601-1) and industrial safety standards. |
| 1.71V–5.5V dual-supply flexibility | Eliminates external level shifters when interfacing 1.8V FPGAs with 5V fieldbus transceivers. |
Applications
| Isolated SPI Interface | Industrial Fieldbus Communication |
|---|---|
Use Scenario: Isolating SPI bus between MCU and isolated ADC/DAC in programmable logic controller (PLC) analog I/O module. IC Role / Device Role / Timing Role: Provides galvanic separation between controller domain (3.3V) and sensor/actuator domain (24V), preserving signal integrity at 10MHz clock. Use Value: Prevents ground loop noise from corrupting 16-bit ADC conversions while supporting <5ns propagation skew across all four channels. | Use Scenario: Signal isolation in RS-485 node of factory-floor EtherCAT slave device operating near variable-frequency drives. IC Role / Device Role / Timing Role: Isolates UART-to-RS-485 transceiver control lines (TXEN, DE, RE) and data lines (RXD/TXD) with matched delay paths. Use Value: Maintains RS-485 half-duplex timing compliance (tEN = 3.5ns, tTRI = 6.4ns) while rejecting 50kV/μs common-mode noise from adjacent motor cables. |
| Battery Management System (BMS) | Medical Patient Monitoring Equipment |
Use Scenario: Isolating cell voltage monitoring IC (e.g., MAX17852) communication from main system MCU in EV traction battery pack. IC Role / Device Role / Timing Role: Transfers daisy-chained UART data across 400V potential difference between battery stack and controller board. Use Value: Achieves 3.75kVRMS withstand rating and 445VRMS working voltage (VIOWM) required for functional insulation in ASIL-C BMS designs. | Use Scenario: Isolating ECG front-end analog acquisition chain from digital processing unit in bedside patient monitor. IC Role / Device Role / Timing Role: Separates low-noise analog domain (±5V supplies) from noisy digital domain (3.3V MCU), meeting IEC 60601-1 creepage/clearance rules. Use Value: Provides 4mm minimum creepage/clearance and Group I CTI (>600) material - certified for patient-connected applications with single-fault protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641ED-B-IS | 4-channel, 200Mbps, 5kVRMS SOIC-16, default-high outputs, higher supply current (1.9mA @ 1Mbps, 3.3V) | Requires external pull-down for fail-safe low behavior; suited for systems needing higher isolation voltage. | Select when 5kVRMS rating is mandatory and default-high logic is acceptable. |
| ADUM140D0BRZ | 4-channel, 150Mbps, 3.75kVRMS SOIC-16, default-low, lower CMTI (35kV/μs), higher propagation delay (17.4ns min) | Limited to lower-speed protocols (e.g., isolated I²C, slow SPI); less robust in high-noise motor control. | Choose for cost-sensitive designs where 150Mbps suffices and CMTI > 40kV/μs is not required. |
Compared with SI8641ED-B-IS and ADUM140D0BRZ, the MAX14431FASE+ uniquely combines 200Mbps speed, default-low fail-safe, and 50kV/μs CMTI in a 3.75kVRMS SOIC package - making it optimal for high-reliability industrial and medical isolation where timing precision and noise immunity are co-critical.
Availability
MAX14431FASE+ is available at Aetrix Electronics and suitable for isolated SPI interfaces, industrial fieldbus nodes, battery management systems, and medical monitoring equipment requiring stable component supply across extended temperature and safety certification lifecycles.
Supply support for MAX14431FASE+ 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.
The MAX14430–MAX14432 family was designed for high-speed, low-power galvanic isolation in safety-critical industrial and medical systems where precise timing, robust noise immunity, and regulatory compliance are non-negotiable.
FAQ
What is the isolation voltage rating of the MAX14431FASE+?
The MAX14431FASE+ has a 3.75kVRMS isolation rating for 60 seconds per UL1577 and CSA Bulletin 5A, validated in its narrow SOIC package. It also supports 445VRMS maximum working isolation voltage (VIOWM) and 6kVP maximum transient isolation voltage (VIOTM), meeting reinforced insulation requirements for industrial and medical applications.
Does the MAX14431FASE+ support different supply voltages on each side?
Yes, the MAX14431FASE+ supports independent 1.71V to 5.5V supplies on Side A (VDDA/GNDA) and Side B (VDDB/GNDB). This enables seamless level translation - for example, interfacing a 1.8V FPGA I/O bank with a 5V RS-485 transceiver - without external level shifters or voltage regulators.
What is the default output state of the MAX14431FASE+ and why does it matter?
The MAX14431FASE+ features default-low outputs, meaning all OUT1–OUT4 pins drive low when inputs are unpowered or open-circuited. This fail-safe behavior prevents unintended activation of downstream circuitry - such as MOSFET gates or RS-485 drivers - during power-up, brown-out, or communication faults, enhancing system safety in BMS and medical designs.
How does the MAX14431FASE+ handle high common-mode noise in motor drive applications?
The MAX14431FASE+ achieves 50kV/μs typical common-mode transient immunity (CMTI), verified per IEC 60747-5-5. This allows it to maintain correct logic levels despite rapid voltage transients (e.g., 600V bus switching edges) coupling across the isolation barrier - a key requirement for reliable encoder feedback or current-sense isolation in servo drives and inverters.
Is the MAX14431FASE+ pin-compatible with other members of the MAX14430–MAX14432 family?
No - the MAX14431FASE+ is not pin-compatible with MAX14430 or MAX14432 variants due to differing channel direction configurations and enable logic polarity. The MAX14431FASE+ is a 4-channel unidirectional isolator with active-low enable and default-low outputs; substituting other variants requires PCB layout changes and firmware validation.
MAX14431FASE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- CAN, RS422, RS485
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs (Typ)
- Data Rate:
- 200Mbps
- Propagation Delay tpLH / tpHL (Max):
- 9.2ns, 9.4ns
- Pulse Width Distortion (Max):
- 2ns
- Rise / Fall Time (Typ):
- 1.6ns, 1.4ns (Max)
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX14431FASE+ FAQ
1.How can I place an order for MAX14431FASE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14431FASE+ 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 MAX14431FASE+ reliable?
The price and inventory of MAX14431FASE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14431FASE+ is usually 5 days.
3.What payment methods are accepted for MAX14431FASE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14431FASE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14431FASE+?
MAX14431FASE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14431FASE+ 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 MAX14431FASE+?
For technical support, including MAX14431FASE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14431FASE+ requirements.
6.How does Aetrix verify that MAX14431FASE+ is sourced from the original manufacturer or authorized distributors?
All MAX14431FASE+ 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 MAX14431FASE+ meets industry standards.
7.What is the process for return or replacement of MAX14431FASE+?
All MAX14431FASE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14431FASE+, 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 MAX14431FASE+ part is unused and in its original packaging.
Return procedure for MAX14431FASE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14431FASE+ Tags
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