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Analog Devices Inc./Maxim Integrated MAX14931CAWE+T
- Part No.:
- MAX14931CAWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX14931CAWE+T.pdf
- Description:
- DGTL ISO 2750VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,784
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Product details
Overview
MAX14931CAWE+T from Analog Devices is a 4-channel, 2.75kVRMS galvanic digital isolator in a 16-pin wide-body SOIC package (10.3mm × 7.5mm), supporting unidirectional signal transfer at up to 150Mbps with 5.1ns typical propagation delay (tPLH) and 25kV/µs common-mode transient immunity. It operates across -40°C to +125°C ambient and enables isolated SPI, RS-485, and industrial I/O interfacing between circuits with independent 1.71V–5.5V supplies.
For engineers reviewing the MAX14931CAWE+T datasheet, MAX14931CAWE+T pinout, MAX14931CAWE+T application, or MAX14931CAWE+T equivalent, this device delivers high-speed, safety-certified isolation for fieldbus systems, battery management units, and medical equipment where robustness against fast transients and extended temperature operation are critical selection criteria.
Technical Context
The MAX14931CAWE+T implements capacitive isolation using Maxim's proprietary process, providing reinforced insulation with 2.75kVRMS withstand rating (60s), 443VRMS working voltage (VIOWM), and 630VPK repetitive peak voltage (VIORM). Its architecture supports four independent unidirectional channels - three input-to-output (A→B) and one output-enable-controlled channel - enabling flexible SPI bus isolation with separate enable control per side.
It features dual independent supply domains (VDDA/GNDA and VDDB/GNDB), allowing level translation between 1.71V and 5.5V logic families. The device includes integrated undervoltage lockout (1.58V threshold, 50mV hysteresis) and supports default-low output behavior when inputs are unpowered, as indicated by the "C" suffix in the part number.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 2750VRMS for 60s - meets UL1577, VDE 0884-11 Basic Insulation, and IEC 61000-4-5 ±10kV surge immunity. |
| Data Rate | 150Mbps - supports high-speed serial interfaces like isolated USB bridge control or fast sensor data acquisition. |
| Propagation Delay | 5.1ns (tPLH, typ) at 5V - enables sub-10ns timing-critical applications such as real-time motor control feedback loops. |
| CMTI | 25kV/µs - ensures reliable operation in noisy industrial environments with rapid ground potential shifts. |
| Supply Range | 1.71V to 5.5V per side - allows direct interfacing with low-voltage microcontrollers (1.8V) and legacy 5V peripherals without level shifters. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and battery pack monitoring applications. |
| Default Output State | Low - defined by "C" in part number; outputs drive low when input side is unpowered, preventing floating states in fail-safe systems. |
Pinout & Package
Package: 16-pin wide-body SOIC (W16M+8), 10.3mm × 7.5mm, 1.27mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (INA1–INA4) | Primary-side digital inputs | Accept 1.71V–5.5V logic signals; referenced to GNDA; VIH = 0.7×VDDA, VIL = 0.6–0.8V. |
| 5 (GNDA) | Primary-side ground | Reference for VDDA and all INA_/ENA signals; must be isolated from GNDB. |
| 6 (VDDA) | Primary-side power supply | Supplies input-side circuitry; UVLO triggers below 1.45V; max 6V absolute rating. |
| 7 (ENA) | Primary-side output enable | Active-high control for OUTA1–OUTA4; drives outputs to high-impedance when low. |
| 8–11 (OUTA1–OUTA4) | Primary-side isolated outputs | CMOS outputs referenced to GNDA; VOH = VDDA–0.4V, VOL = 0.4V at 4mA load. |
| 12 (GNDB) | Secondary-side ground | Reference for VDDB and all INB_/ENB signals; galvanically isolated from GNDA. |
| 13 (VDDB) | Secondary-side power supply | Supplies output-side circuitry; independent of VDDA; same UVLO and voltage range. |
| 14 (ENB) | Secondary-side output enable | Active-high control for OUTB1–OUTB4; enables/disables secondary outputs independently. |
| 15, 16 (OUTB1–OUTB2) | Secondary-side isolated outputs | Only two outputs on secondary side (MAX14931 configuration); full 4-channel isolation achieved via A→B and B→A paths. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced galvanic isolation barrier | 2.75kVRMS withstand (UL/VDE certified) enables single protection in medical (IEC 60601-1) and industrial safety designs. |
| High-speed unidirectional channel mapping | Three A→B channels + one B→A channel supports full-duplex SPI isolation with dedicated chip-select and data lines. |
| Low-power, high-data-rate operation | 14.2mA typical total supply current at 150Mbps and 3.3V - reduces thermal load in dense PCB layouts. |
| Robust noise immunity | 25kV/µs CMTI and 15ns glitch rejection prevent false triggering in EMI-heavy factory automation environments. |
| Fail-safe default-low output | "C" suffix guarantees outputs go low during primary-side power loss - critical for safe shutdown in motor drives and BMS. |
Applications
| Industrial Fieldbus Isolation | SPI Interface Isolation |
|---|---|
|
Use Scenario: Isolating Modbus RTU or Profibus DP nodes in factory floor PLC racks exposed to 4kV surges and >10kV/m EMI. IC Role / Device Role / Timing Role: Provides galvanic separation between controller UART and RS-485 transceiver, blocking ground loops while preserving 921.6kbps timing integrity. Use Value: Enables reliable communication over 1200m cable runs without data corruption, meeting IEC 61000-4-4/5 immunity requirements. |
Use Scenario: Isolating an MCU's SPI interface from an isolated ADC or DAC in a high-voltage energy meter. IC Role / Device Role / Timing Role: Transfers SCLK, MOSI, MISO, and CS signals across isolation barrier with <10ns skew, maintaining SPI Mode 0/3 timing margins. Use Value: Prevents fault currents from propagating into the MCU domain during overvoltage events on the measurement side. |
| Battery Management Systems | Medical Patient Monitoring |
|
Use Scenario: Isolating cell voltage and temperature sensing ICs from the main BMS controller in EV traction battery packs. IC Role / Device Role / Timing Role: Transfers digital sensor data (e.g., from TI BQ796xx) across 500V potential difference while supporting 1Mbps daisy-chain communication. Use Value: Maintains functional safety (ASIL-D capable architecture) and prevents single-point failures from compromising pack-level diagnostics. |
Use Scenario: Isolating ECG front-end analog signal chain from digital processing unit in portable patient monitors. IC Role / Device Role / Timing Role: Separates low-noise analog domain (GNDA) from noisy digital domain (GNDB), eliminating 50/60Hz mains coupling. Use Value: Achieves >100dB CMRR at 60Hz and complies with IEC 60601-1 443VRMS working voltage for 2MOOP patient-connected devices. |
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, 5kVRMS isolation, 150Mbps, default-high outputs, QSOP-16 package (6mm × 5mm). | Lacks default-low behavior; smaller footprint but lower creepage (4mm vs. 8mm), limiting use in high-altitude or high-pollution environments. | Select when board space is constrained and default-high logic is acceptable; verify creepage compliance for end-equipment safety certification. |
| ADUM4401BRWZ | 4-channel, 5kVRMS, 25Mbps max rate, SOIC-16 wide body, default-high outputs, 2.5kV RMS UL rating. | Lower speed and isolation rating; uses iCoupler magnetic isolation instead of capacitive; higher propagation delay (32ns). | Choose for cost-sensitive industrial controls where 25Mbps suffices and magnetic isolation is preferred for ESD robustness. |
Compared with SI8641ED-B-IS and ADUM4401BRWZ, the MAX14931CAWE+T uniquely combines 150Mbps speed, 2.75kVRMS reinforced isolation with 8mm creepage, and factory-configured default-low outputs - making it optimal for high-reliability, high-speed, fail-safe isolated communication in battery and medical systems.
Availability
MAX14931CAWE+T is available at Aetrix Electronics and suitable for industrial fieldbus nodes, isolated SPI subsystems, and battery management systems requiring stable component supply across extended temperature and safety-critical operating conditions.
Supply support for MAX14931CAWE+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 MAX14930–MAX14932 family was designed specifically for high-speed, safety-certified galvanic isolation in harsh environments - targeting industrial automation, energy infrastructure, and medical electronics where reliability, speed, and regulatory compliance are non-negotiable.
FAQ
What is the default output state of the MAX14931CAWE+T, and how is it configured?
The MAX14931CAWE+T has a factory-configured default-low output state, indicated by the "C" suffix in the part number. When the input-side supply (VDDA) is unpowered or below UVLO threshold (≤1.45V), all OUTA outputs drive low. This behavior is hardwired in silicon and requires no external components or configuration pins - ensuring predictable fail-safe operation in power-loss scenarios for the MAX14931CAWE+T.
Does the MAX14931CAWE+T support bidirectional communication like I²C?
No, the MAX14931CAWE+T is a unidirectional isolator optimized for protocols such as SPI, RS-232, and RS-485. It provides three A→B channels and one B→A channel - not true bidirectional pins. For I²C isolation, Analog Devices recommends the MAX14933, which integrates bus-hold circuitry and slew-rate control specifically for open-drain bidirectional signaling - a capability the MAX14931CAWE+T does not implement.
What safety certifications apply to the MAX14931CAWE+T, and what do they cover?
The MAX14931CAWE+T is certified to UL1577 (3750VRMS), CSA C22.2 No. 5A (cUL), and VDE 0884-11:2017 (Basic Insulation). These cover 2.75kVRMS withstand voltage (60s), 443VRMS working voltage (VIOWM), and 630VPK repetitive peak voltage (VIORM). Certifications validate its use in single-protection applications per IEC 61010-1 and IEC 60601-1 - confirmed in file E351759 (UL/cUL) and 5015017-4880-0001 (VDE) for the MAX14931CAWE+T.
Can the MAX14931CAWE+T operate with different supply voltages on each side, such as 1.8V on Side A and 5V on Side B?
Yes, the MAX14931CAWE+T supports independent 1.71V–5.5V supplies on each side (VDDA/GNDA and VDDB/GNDB), enabling seamless level translation. For example, it can accept 1.8V LVCMOS inputs on Side A while driving 5V-tolerant outputs on Side B - eliminating external level shifters. Input thresholds scale with respective VDD (VIH = 0.7×VDD), and output drive strength remains consistent across the full voltage range for the MAX14931CAWE+T.
How does the MAX14931CAWE+T handle common-mode transients, and what is its CMTI rating?
The MAX14931CAWE+T achieves 25kV/µs common-mode transient immunity (CMTI), measured per IEC 60747-5-5 with 1000V common-mode step applied between GNDA and GNDB. This performance is enabled by matched capacitive isolation cells and internal filtering, ensuring correct output logic states even during fast ground-bounce events in motor drives or switch-mode power supplies - a key reliability metric validated across temperature for the MAX14931CAWE+T.
MAX14931CAWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2750Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs (Typ)
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 7.5ns, 7.4ns
- Pulse Width Distortion (Max):
- 1ns
- Rise / Fall Time (Typ):
- 2ns, 2ns
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX14931CAWE+T FAQ
1.How can I place an order for MAX14931CAWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14931CAWE+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 MAX14931CAWE+T reliable?
The price and inventory of MAX14931CAWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14931CAWE+T is usually 5 days.
3.What payment methods are accepted for MAX14931CAWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14931CAWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14931CAWE+T?
MAX14931CAWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14931CAWE+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 MAX14931CAWE+T?
For technical support, including MAX14931CAWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14931CAWE+T requirements.
6.How does Aetrix verify that MAX14931CAWE+T is sourced from the original manufacturer or authorized distributors?
All MAX14931CAWE+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 MAX14931CAWE+T meets industry standards.
7.What is the process for return or replacement of MAX14931CAWE+T?
All MAX14931CAWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX14931CAWE+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 MAX14931CAWE+T part is unused and in its original packaging.
Return procedure for MAX14931CAWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14931CAWE+T Tags
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