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Analog Devices Inc./Maxim Integrated MAX14431FASE+T
- Part No.:
- MAX14431FASE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX14431FASE+T.pdf
- Description:
- 4-CHANNEL, LOW POWER, 3.75KV DIG
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
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Product details
Overview
The MAX14431FASE+T 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 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+T datasheet, MAX14431FASE+T pinout, MAX14431FASE+T application, or MAX14431FASE+T equivalent, this device is selected for high-speed, safety-certified signal isolation in battery management systems, medical equipment, and industrial automation where VIOWM = 445VRMS, CMTI ≥ 50kV/μs, and fail-safe delay ≤ 50μs are critical design constraints.
Technical Context
The MAX14431FASE+T implements capacitive-based galvanic isolation using Maxim's proprietary process, enabling bidirectional voltage domain separation between side A (VDDA/GNDA) and side B (VDDB/GNDB). Its architecture supports active-low enable inputs (ENA/ENB) and default-low outputs, ensuring predictable state during power loss or open-circuit input conditions.
It delivers 200Mbps operation with propagation delay as low as 4.1ns (tPLH, VDD ≥ 4.5V), pulse width distortion under 2ns, and channel-to-channel skew ≤ 1.5ns - all while maintaining 50kV/μs common-mode transient immunity and UL/cUL certification to 3750VRMS for 60 seconds in the narrow SOIC package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3.75kVRMS for 60s - meets reinforced insulation requirements per UL1577 and CSA 5A in narrow SOIC package. |
| Max Data Rate | 200Mbps - enables high-speed serial links such as isolated SPI clock domains and fast RS-485 transceiver control paths. |
| CMTI | 50kV/μs typical - ensures reliable operation in noisy motor drive or power converter environments without output glitches. |
| Supply Range | 1.71V to 5.5V per side - allows level translation between 1.8V microcontrollers and 3.3V/5V peripherals across isolation barrier. |
| Fail-Safe Delay | 50μs - guarantees defined low-state output within 50μs of input power loss or open-circuit condition. |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and medical diagnostic equipment deployment. |
| Power @ 1Mbps | 1.1mW per channel at 3.3V - reduces thermal load and extends battery life in portable isolated sensor nodes. |
Pinout & Package
Package: 16-pin narrow-body SOIC (package code S16MS+12), 4mm creepage/clearance, CTI > 600 (Group I), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Side A supply | 1.71V–5.5V logic-side power; powers IN1–IN4 and ENA inputs. |
| GNDA | Side A ground | Reference for all side A signals; must be isolated from GNDB. |
| IN1–IN4 | Input channels | CMOS-compatible digital inputs; accept 0.7×VDDA high threshold and 0.8V low threshold. |
| ENA | Enable A | Active-low enable for side A outputs; pulls outputs to default state when high. |
| VDDB | Side B supply | 1.71V–5.5V isolated-side power; powers OUT1–OUT4 and ENB. |
| GNDB | Side B ground | Reference for all side B signals; galvanically isolated from GNDA. |
| OUT1–OUT4 | Output channels | Default-low CMOS outputs; sink 4mA / source –4mA with VOL ≤ 0.4V and VOH ≥ VDDB–0.4V. |
| ENB | Enable B | Active-low enable for side B outputs; controls tristate behavior with tTRI ≤ 19.4ns (1.71V). |
Key Features
| Feature | Design Value |
|---|---|
| 200Mbps data rate | Supports real-time isolated communication in high-bandwidth applications like servo feedback loops and digital power control. |
| 50kV/μs CMTI | Prevents false triggering in high-dv/dt environments such as IGBT gate drivers and motor inverters. |
| Fail-safe default-low outputs | Ensures safe system state (e.g., disable signal asserted) during brownout or disconnected input wiring. |
| 1.71V–5.5V dual-supply flexibility | Enables direct interfacing between ultra-low-voltage MCUs (1.8V) and legacy 5V industrial buses without external level shifters. |
| UL/cUL 3750VRMS certified | Fulfills reinforced insulation requirements for medical (IEC 60601-1) and industrial safety standards without additional system-level certification effort. |
Applications
| Isolated SPI Interface | Industrial Fieldbus Communications |
|---|---|
Use Scenario: Isolating SPI bus between MCU and isolated ADC/DAC in high-noise PLC backplane. IC Role / Device Role / Timing Role: Four-channel unidirectional isolator separating MOSI/MISO/SCLK/CS signals with matched propagation delay (≤2ns skew) to preserve timing integrity. Use Value: Enables 200Mbps SPI clocking with <2ns pulse width distortion, eliminating setup/hold violations in multi-MHz sampling systems. | Use Scenario: Signal isolation for RS-485 transceiver control lines (DE/RE) and data lines in factory-floor networks. IC Role / Device Role / Timing Role: Galvanic barrier for control and data paths, supporting 200Mbps burst transfers and surviving ±10kV surge (1.2/50μs) per UL1577. Use Value: Maintains communication reliability in electrically hostile environments where ground loops induce >50kV/μs transients. |
| Battery Management Systems | Medical Diagnostic Equipment |
Use Scenario: Isolating cell voltage monitoring ICs from host MCU in EV battery packs with 400V+ common-mode potential. IC Role / Device Role / Timing Role: High-CMTI, low-power isolator for analog front-end digital control and status reporting across 3.75kVRMS barrier. Use Value: Delivers 1.1mW/channel at 1Mbps - critical for minimizing self-heating in sealed, thermally constrained battery enclosures. | Use Scenario: Isolating patient-connected ECG/EEG sensor front-ends from digital processing unit in Class II medical devices. IC Role / Device Role / Timing Role: Reinforced insulation barrier certified to UL1577 and CSA 5A, meeting IEC 60601-1 creepage/clearance and VIOWM = 445VRMS requirements. Use Value: Guarantees 50μs fail-safe response on power loss - prevents hazardous output states during emergency shutdown or cable disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4401BRIZ | 4-channel, 25Mbps, 5kVRMS SOIC, default-high outputs, 1.7–5.5V supplies | Lower speed; higher isolation rating; not suitable for 200Mbps SPI but preferred for long-life, high-reliability 5kVRMS medical isolation. | Select when 5kVRMS reinforced insulation is mandatory and data rate ≤25Mbps suffices. |
| SI8641ED-B-IS | 4-channel, 150Mbps, 5kVRMS SOIC, default-low outputs, 2.5–5.5V supplies only | Higher isolation (5kVRMS), lower max speed (150Mbps vs. 200Mbps), no 1.8V support - limits use with ultra-low-voltage MCUs. | Choose when 5kVRMS is required and system operates ≥2.5V; avoid if 1.8V interface or >150Mbps is needed. |
Compared with ADUM4401BRIZ and SI8641ED-B-IS, the MAX14431FASE+T uniquely combines 200Mbps speed, 1.8V compatibility, and 3.75kVRMS certified isolation in a narrow SOIC - making it optimal for space-constrained, high-throughput industrial and battery-powered designs where both performance and safety certification are non-negotiable.
Availability
MAX14431FASE+T is available at Aetrix Electronics and suitable for isolated SPI interfaces, industrial fieldbus nodes, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX14431FASE+T 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 specifically for high-speed, low-power galvanic isolation in safety-critical industrial and medical systems - emphasizing CMTI robustness, fail-safe behavior, and dual-supply flexibility across wide temperature ranges.
FAQ
What is the maximum data rate supported by the MAX14431FASE+T?
The MAX14431FASE+T supports a maximum data rate of 200Mbps under conditions of 2.25V ≤ VDD ≤ 5.5V. At lower supply voltages (1.71V–1.89V), the guaranteed maximum data rate is 150Mbps. This performance enables its use in high-speed isolated serial interfaces such as SPI clock domains and fast RS-485 control links, where timing margins are tight and jitter must be minimized.
Does the MAX14431FASE+T support 1.8V operation on both sides of the isolation barrier?
Yes, the MAX14431FASE+T supports independent 1.71V to 5.5V supplies on both side A (VDDA/GNDA) and side B (VDDB/GNDB), including full functionality at 1.8V. This allows direct interfacing with 1.8V microcontrollers and FPGAs while driving 3.3V or 5V isolated peripherals - eliminating external level shifters and reducing BOM count and board area in compact, battery-sensitive designs.
What safety certifications does the MAX14431FASE+T hold?
The MAX14431FASE+T is certified to UL1577 (File E351759) and CSA Bulletin 5A (cUL), with a 3750VRMS isolation rating for 60 seconds in its narrow SOIC package. It also meets IEC 60747-5-5 requirements for VIOWM = 445VRMS and VIOSM = ±10kV surge (1.2/50μs), qualifying it for reinforced insulation in medical (IEC 60601-1) and industrial safety applications without additional system-level testing.
How does the fail-safe behavior of the MAX14431FASE+T work?
The MAX14431FASE+T features default-low outputs that transition to a known low state within 50μs of input power loss, open-circuit input, or ENA/ENB deassertion. This fail-safe delay ensures predictable, safe system behavior - for example, disabling a motor driver or asserting a fault flag - even during brownout or wiring faults, which is essential for compliance with functional safety requirements in industrial and medical equipment.
What is the common-mode transient immunity (CMTI) specification for the MAX14431FASE+T?
The MAX14431FASE+T has a typical common-mode transient immunity (CMTI) of 50kV/μs, tested per IEC 60747-5-5 with 1000V common-mode step applied between GNDA and GNDB. This high CMTI rating ensures reliable signal transmission in electrically noisy environments such as motor drives, switch-mode power supplies, and industrial inverters, where rapid ground potential shifts would otherwise cause output glitches or data corruption.
MAX14431FASE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- CAN, RS232, RS422, RS485, SPI
- 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+T FAQ
1.How can I place an order for MAX14431FASE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14431FASE+T 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+T reliable?
The price and inventory of MAX14431FASE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14431FASE+T is usually 5 days.
3.What payment methods are accepted for MAX14431FASE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14431FASE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14431FASE+T?
MAX14431FASE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14431FASE+T 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+T?
For technical support, including MAX14431FASE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14431FASE+T requirements.
6.How does Aetrix verify that MAX14431FASE+T is sourced from the original manufacturer or authorized distributors?
All MAX14431FASE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX14431FASE+T?
All MAX14431FASE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX14431FASE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX14431FASE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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