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Analog Devices Inc./Maxim Integrated MAX14931AASE+
- Part No.:
- MAX14931AASE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX14931AASE+.pdf
- Description:
- DGTL ISO 2750VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:345
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Product details
Overview
MAX14931AASE+ from Analog Devices is a 4-channel, unidirectional digital isolator with 2.75kVRMS galvanic isolation, 150Mbps maximum data rate, and independent 1.71V–5.5V dual-supply operation on isolated sides. It features 6.67ns minimum pulse width, 25kV/µs common-mode transient immunity, and operates across –40°C to +125°C for industrial fieldbus and isolated SPI/RS-485 interfaces.
For engineers reviewing the MAX14931AASE+ datasheet, MAX14931AASE+ pinout, MAX14931AASE+ application, or MAX14931AASE+ equivalent, this device delivers high-speed, robust channel-to-channel isolation with low propagation delay skew (≤0.9ns typical), precise timing control for real-time control loops, and compatibility with 1.8V/3.3V/5V microcontrollers and FPGAs in safety-critical systems.
Technical Context
The MAX14931AASE+ implements capacitive isolation using Maxim's proprietary process, supporting only unidirectional signal transfer across all four channels - two A→B and two B→A - enabling asymmetric I/O routing for SPI bus isolation. Its architecture includes integrated enable inputs (ENA/ENB) per side for power-gated output control and supports default-low output state when input is unpowered.
It meets VDE 0884-11 Basic Insulation requirements with 630VPK repetitive peak voltage (VIORM), 443VRMS working voltage (VIOWM), and withstands ±10kV surge per IEC 61000-4-5. The device is rated for continuous operation up to +125°C ambient and qualified per UL1577 (3750VRMS) and cUL standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.75kVRMS for 60s (VISO); enables use in reinforced insulation systems per IEC 61800-5-1 |
| Max Data Rate | 150Mbps - supports high-speed serial links like isolated USB bridge control or fast sensor data acquisition |
| Propagation Delay | 5.1ns (tPLH typ @ 5V) - ensures sub-10ns timing precision for closed-loop motor control feedback paths |
| CMTI | 25kV/µs - maintains signal integrity in noisy industrial environments with rapid ground shifts |
| Supply Range | 1.71V to 5.5V per side - allows direct interfacing with mixed-voltage SoCs and level translation without external logic |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, battery management, and factory-floor automation |
| Package | 16-pin wide-body SOIC (10.3mm × 7.5mm, 8mm creepage/clearance) - meets IPC-2221 Class B spacing for 300V working voltage |
Pinout & Package
MAX14931AASE+ uses a 16-pin wide-body SOIC package (outline 21-0042, code W16M+8) with 8mm creepage and clearance, RoHS-compliant, and rated for 2.75kVRMS isolation. Pin functions are validated per functional diagram and absolute maximum ratings table in Analog Devices' datasheet Rev 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA1, INA2 | Side-A input | Accepts logic signals referenced to GNDA; VIH = 0.7×VDDA, VIL ≤ 0.8V |
| INB1, INB2 | Side-B input | Accepts logic signals referenced to GNDB; VIH = 0.7×VDDB, VIL ≤ 0.8V |
| OUTA1, OUTA2 | Side-A output | Drives loads referenced to GNDA; VOH ≥ VDDA–0.4V, VOL ≤ 0.4V @ 4mA |
| OUTB1, OUTB2 | Side-B output | Drives loads referenced to GNDB; VOH ≥ VDDB–0.4V, VOL ≤ 0.4V @ 4mA |
| ENA | Side-A output enable | Active-high; places OUTA1/OUTA2 in high-impedance when low; tEN = 5.1ns typ |
| ENB | Side-B output enable | Active-high; places OUTB1/OUTB2 in high-impedance when low; tEN = 5.1ns typ |
| VDDA, GNDA | Side-A power | Supplies isolated side A; accepts 1.71–5.5V; UVLO threshold = 1.58V typ |
| VDDB, GNDB | Side-B power | Supplies isolated side B; accepts 1.71–5.5V; UVLO threshold = 1.58V typ |
Key Features
| Feature | Design Value |
|---|---|
| High-speed unidirectional isolation | 150Mbps data rate with 6.67ns minimum pulse width enables real-time encoder interface in servo drives |
| Low-skew timing performance | Channel-to-channel skew ≤0.9ns (same direction) ensures synchronized sampling across multiple isolated ADC channels |
| Robust noise immunity | 25kV/µs CMTI rating prevents data corruption during fast transients in motor drive inverters or PLC backplanes |
| Dual-supply flexibility | Independent 1.71–5.5V supplies per side allow direct connection to 1.8V FPGA I/O banks and 3.3V MCU peripherals |
| Safety-certified isolation barrier | VDE 0884-11 Basic Insulation + UL1577 (3750VRMS) compliance simplifies system-level safety certification for medical and industrial equipment |
Applications
| Industrial Fieldbus Isolation | Isolated SPI Interface |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in distributed I/O modules for factory automation networks. IC Role / Device Role / Timing Role: Provides galvanic separation between controller-side logic and bus-side transceiver, blocking ground loops while preserving 25Mbps signaling integrity. Use Value: Enables reliable communication over 1200m cable runs in electrically noisy environments with >25kV/µs transient immunity. |
Use Scenario: Isolating SPI clock, MOSI, MISO, and CS lines between an MCU and isolated ADC/DAC in battery management systems. IC Role / Device Role / Timing Role: Transfers full-duplex SPI traffic at up to 150Mbps with <1ns channel skew to maintain timing margins in high-resolution data acquisition. Use Value: Eliminates measurement errors caused by ground potential differences between cell monitoring ICs and host controller. |
| Motor Drive Feedback Isolation | Medical Sensor Interface |
|
Use Scenario: Isolating position encoder signals (A/B/Z quadrature) from motor control FPGAs in servo drives. IC Role / Device Role / Timing Role: Delivers sub-10ns propagation delay and <1ns skew to preserve edge alignment critical for commutation timing. Use Value: Supports 20kHz PWM switching with zero phase error in closed-loop current control loops. |
Use Scenario: Isolating analog front-end sensor data paths in patient-connected diagnostic devices (e.g., ECG, EEG). IC Role / Device Role / Timing Role: Provides certified basic insulation (VDE 0884-11, IEC 60601-1 MOOP) between patient-side analog circuitry and digital processing unit. Use Value: Meets 630VPK transient voltage rating and 443VRMS working voltage requirements for Type BF applied parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641ED-IS | 4-channel, 150Mbps, 2.5kVRMS isolation; 5kV surge rating; different pinout (SOIC-16 narrow) | Lacks default-low output option; no ENB/ENA per side; lower CMTI (20kV/µs) | Choose for cost-sensitive designs where 2.5kVRMS suffices and board space favors narrow SOIC |
| ADUM4401BRWZ | 4-channel, 100Mbps, 5kVRMS isolation; iCoupler® magnetic technology; SOIC-16 wide | Higher isolation rating but slower speed; higher propagation delay (32ns typ); no dual-supply flexibility | Choose when 5kVRMS reinforcement is required and data rate ≤100Mbps is acceptable |
Compared with SI8641ED-IS and ADUM4401BRWZ, the MAX14931AASE+ uniquely combines 150Mbps speed, 2.75kVRMS isolation, per-side enable control, and true 1.71–5.5V dual-supply operation - making it optimal for high-bandwidth, mixed-voltage, safety-certifiable industrial interfaces.
Availability
MAX14931AASE+ is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated SPI interfaces, motor drive feedback systems, and medical sensor isolation requiring stable component supply and long-term lifecycle support.
Supply support for MAX14931AASE+ 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 since 1965.
The MAX14930–MAX14932 family was designed specifically for high-speed, safety-certified digital isolation in harsh industrial and medical environments - emphasizing low skew, high CMTI, and flexible supply operation.
FAQ
What is the maximum data rate supported by the MAX14931AASE+?
The MAX14931AASE+ supports a maximum data rate of 150Mbps, verified across all supply voltages (1.8V–5.5V) and temperature range (–40°C to +125°C). This is achieved with 6.67ns minimum pulse width and <1ns channel-to-channel skew, making MAX14931AASE+ suitable for high-speed isolated serial protocols including fast SPI and encoder interfaces.
Does the MAX14931AASE+ support bidirectional communication?
No, the MAX14931AASE+ is a unidirectional digital isolator with fixed channel direction: two channels transmit from Side A to Side B (INA1/INA2 → OUTB1/OUTB2), and two channels transmit from Side B to Side A (INB1/INB2 → OUTA1/OUTA2). For bidirectional I²C isolation, Analog Devices recommends the MAX14933 instead of MAX14931AASE+.
What safety certifications does the MAX14931AASE+ hold?
The MAX14931AASE+ is certified to UL1577 (3750VRMS), cUL (CSA 5A), and VDE 0884-11:2017-01 for Basic Insulation. It meets IEC 60950-1, IEC 61010-1, and IEC 60601-1 (MOOP) requirements, with 630VPK repetitive peak voltage (VIORM) and 443VRMS working voltage (VIOWM), fully documented in file E351759 and TUV report 095-72100581-200.
Can the MAX14931AASE+ operate with different supply voltages on each side?
Yes, the MAX14931AASE+ supports independent 1.71V to 5.5V supplies on Side A (VDDA/GNDA) and Side B (VDDB/GNDB), enabling seamless level translation - for example, interfacing a 1.8V FPGA I/O bank with a 3.3V microcontroller or 5V analog front-end. Undervoltage lockout activates at 1.58V typical on each rail.
What is the default output state of the MAX14931AASE+ when input power is removed?
The MAX14931AASE+ is configured as a default-low device: when either VDDA or VDDB is unpowered, its corresponding outputs (OUTA1/OUTA2 or OUTB1/OUTB2) transition to logic low. This behavior is confirmed in the Product Selector Guide and distinguishes MAX14931AASE+ from default-high variants like MAX14931AASD+.
MAX14931AASE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 54.1ns, 55.3ns
- Pulse Width Distortion (Max):
- 4.5ns
- 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
MAX14931AASE+ FAQ
1.How can I place an order for MAX14931AASE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14931AASE+ 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 MAX14931AASE+ reliable?
The price and inventory of MAX14931AASE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14931AASE+ is usually 5 days.
3.What payment methods are accepted for MAX14931AASE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14931AASE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14931AASE+?
MAX14931AASE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14931AASE+ 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 MAX14931AASE+?
For technical support, including MAX14931AASE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14931AASE+ requirements.
6.How does Aetrix verify that MAX14931AASE+ is sourced from the original manufacturer or authorized distributors?
All MAX14931AASE+ 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 MAX14931AASE+ meets industry standards.
7.What is the process for return or replacement of MAX14931AASE+?
All MAX14931AASE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14931AASE+, 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 MAX14931AASE+ part is unused and in its original packaging.
Return procedure for MAX14931AASE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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