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Analog Devices Inc./Maxim Integrated MAX12931BASA+
- Part No.:
- MAX12931BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931BASA+.pdf
- Description:
- DGTL ISO 3750VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,601
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Product details
Overview
The MAX12931BASA+ from Analog Devices is a two-channel, bidirectional digital galvanic isolator in an 8-pin narrow-body SOIC package, rated for 3kVRMS isolation (60s), 445VRMS working voltage, and 50kV/µs CMTI. It supports 25Mbps data rate with 1.71V–5.5V dual supplies and is optimized for isolated UART transceiver interfaces (TX/RX separation) in industrial fieldbus and battery management systems.
For engineers reviewing the MAX12931BASA+ datasheet, MAX12931BASA+ pinout, MAX12931BASA+ application, or MAX12931BASA+ equivalent, this page delivers verified electrical specs, safety-rated insulation parameters, side-A/side-B supply independence, propagation delay skew under 2ns (channel-to-channel, opposite direction), and confirmed compatibility with RS-485/RS-422 transceivers requiring galvanic separation between controller and bus domains.
Technical Context
The MAX12931BASA+ implements proprietary capacitive isolation technology with refresh circuitry to maintain output accuracy during static input conditions. Its two unidirectional channels operate in opposite directions-IN1→OUT1 on Side A and IN2←OUT2 on Side B-enabling full-duplex signal transfer across isolated domains without cross-talk.
It features independent undervoltage lockout (1.5V–1.66V threshold) on both VDDA and VDDB, push-pull outputs eliminating external pull-ups, and logic-level translation capability across 1.71V–5.5V supply ranges per side. The device meets VDE 0884-11 Basic Insulation requirements for narrow SOIC packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3kVRMS for 60s - certifies safe operation under sustained high-voltage stress in industrial environments |
| Working Voltage (VIOWM) | 445VRMS continuous - defines maximum RMS voltage across isolation barrier during normal operation |
| Common-Mode Transient Immunity | 50kV/µs typ - ensures reliable data transmission amid fast-switching noise in motor drives or power converters |
| Max Data Rate | 25Mbps - supports standard RS-485/RS-422 and isolated UART applications up to 25 million bits/sec |
| Propagation Delay Skew (Opposite Dir) | 2ns max - guarantees tight timing alignment between TX and RX paths in full-duplex isolated communication |
| Supply Range (Each Side) | 1.71V to 5.5V - enables level-shifting between 1.8V microcontrollers and 3.3V/5V transceivers without external logic |
| Operating Temp Range | -40°C to +125°C - qualified for deployment in harsh industrial and automotive under-hood environments |
Pinout & Package
MAX12931BASA+ uses an 8-pin narrow-body SOIC package (S8MS-22, outline 21-0041) with CTI ≥400 (Group II creepage rating) and 4mm minimum creepage/clearance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VDDA | Side A power supply | Provides 1.71V–5.5V logic reference for IN1/IN2 inputs and OUT1/OUT2 drivers on primary side |
| 2: IN1 | Channel 1 input | Receives digital signal from local controller (e.g., MCU TX); drives OUT1 on opposite side |
| 3: IN2 | Channel 2 input | Receives digital signal from remote bus (e.g., transceiver RX); drives OUT2 on local side |
| 4: GNDA | Side A ground reference | Return path for VDDA, IN1, IN2; must be isolated from GNDB by PCB layout and system grounding |
| 5: VDDB | Side B power supply | Provides 1.71V–5.5V logic reference for OUT1/OUT2 outputs and IN1/IN2 receivers on isolated side |
| 6: OUT1 | Channel 1 output | Drives transceiver RX line with push-pull CMOS/TTL-compatible output (VOH ≥ VDDA–0.4V, VOL ≤ 0.4V) |
| 7: OUT2 | Channel 2 output | Drives MCU RX line with same drive strength; completes full-duplex path when paired with IN1/IN2 |
| 8: GNDB | Side B ground reference | Return path for VDDB, OUT1, OUT2; forms galvanically separated domain from GNDA |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel configuration | IN1→OUT1 and IN2←OUT2 enables native full-duplex isolation for UART/RS-485 without external routing logic |
| Low-power operation at 25Mbps | 1.3mW per channel at 3.3V - reduces thermal load in space-constrained industrial modules |
| VDE 0884-11 Basic Insulation | Complies with DIN VDE V 0884-11:2017-01 for reinforced insulation in safety-critical systems |
| Integrated refresh circuit | Maintains correct output state during indefinite DC input conditions - eliminates need for external watchdog timers |
| High CMTI immunity | 50kV/µs typical - prevents data corruption in noisy motor control or solar inverter environments |
Applications
| Industrial Fieldbus Isolation | Isolated RS-485 Transceiver Interface |
|---|---|
Use Scenario: Isolating PLC master node from field devices over RS-485 bus in factory automation. IC Role / Device Role / Timing Role: Galvanic barrier between controller-side UART and bus-side transceiver, handling TX (MCU → bus) and RX (bus → MCU) signals. Use Value: Prevents ground loop currents and high-voltage transients (±10kV surge) from damaging sensitive controller circuitry while maintaining 25Mbps link integrity. | Use Scenario: Protecting microcontroller UART lines when interfacing with isolated RS-485 transceivers in energy metering systems. IC Role / Device Role / Timing Role: Bidirectional signal coupler enabling simultaneous transmit and receive across isolation boundary with <2ns channel skew. Use Value: Enables robust full-duplex communication at 25Mbps with guaranteed timing alignment, eliminating protocol retries due to skew-induced framing errors. |
| Battery Management System (BMS) Communication | Medical Isolated Data Acquisition |
Use Scenario: Isolating cell monitor ICs from main BMS controller in EV battery packs. IC Role / Device Role / Timing Role: Digital isolator transferring voltage/current telemetry and fault alerts across high-potential barriers between battery stack and control board. Use Value: Supports 445VRMS continuous working voltage and -40°C to +125°C operation required for automotive-grade BMS reliability. | Use Scenario: Isolating patient-connected analog front-end sensors from host processing unit in diagnostic equipment. IC Role / Device Role / Timing Role: Safety-certified digital isolator conveying digitized sensor data while meeting IEC 60601 creepage/clearance requirements. Use Value: UL1577 and VDE-certified 3kVRMS isolation ensures compliance with medical safety standards for 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 |
|---|---|---|---|
| SI8621ED-IS | 2-channel, 25Mbps, 3.75kVRMS isolation, 16-pin wide SOIC; higher VIOWM (680VRMS) | Requires wider PCB footprint; better suited for designs needing >445VRMS working voltage | Select when higher working voltage margin or enhanced surge immunity (10kV) is required |
| ADUM120N1BRZ | 2-channel, 150Mbps, 3.75kVRMS, 8-pin SOIC; lower CMTI (35kV/µs), no VDE certification | Lacks VDE 0884-11 compliance; unsuitable for medical or safety-certified industrial systems | Choose only for cost-sensitive, non-safety-critical applications where speed >25Mbps is mandatory |
Compared with SI8621ED-IS and ADUM120N1BRZ, the MAX12931BASA+ uniquely combines VDE 0884-11 certification, 50kV/µs CMTI, and 8-pin narrow SOIC packaging - making it optimal for space-constrained, safety-compliant industrial UART isolation where 25Mbps suffices.
Availability
MAX12931BASA+ is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated RS-485 transceiver interfaces, and battery management systems requiring stable component supply, long-term lifecycle support, and certified galvanic isolation performance.
Supply support for MAX12931BASA+ 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The MAX12931BASA+ belongs to the MAX12930/MAX12931 family of low-power, high-CMTI digital isolators designed specifically for robust signal isolation in electrically noisy, safety-critical industrial and medical systems.
FAQ
What is the isolation voltage rating of the MAX12931BASA+?
The MAX12931BASA+ is rated for 3kVRMS withstand voltage for 60 seconds (VISO) and 445VRMS maximum working isolation voltage (VIOWM) in continuous operation. These values apply to the 8-pin narrow-body SOIC package and are certified per UL1577 and VDE 0884-11 Basic Insulation standards. The device also supports ±10kV surge immunity between GNDA and GNDB using a 1.2/50µs waveform.
Does the MAX12931BASA+ support level shifting between different logic voltages?
Yes, the MAX12931BASA+ supports true bidirectional level shifting: VDDA (Side A) and VDDB (Side B) can each be independently set from 1.71V to 5.5V. This allows interfacing a 1.8V microcontroller (VDDA = 1.8V) with a 3.3V RS-485 transceiver (VDDB = 3.3V) without external level translators, while maintaining full 25Mbps data integrity and isolation barrier integrity.
How does the MAX12931BASA+ differ from the MAX12930 series?
The MAX12931BASA+ features opposite-direction channel configuration (IN1→OUT1 and IN2←OUT2), making it ideal for full-duplex UART/RS-485 isolation. In contrast, the MAX12930 has both channels operating in the same direction (IN1→OUT1 and IN2→OUT2), suited for digital I/O expansion. Both share identical isolation ratings, power specs, and package options, but their functional topology is fixed per part number.
What safety certifications does the MAX12931BASA+ hold?
The MAX12931BASA+ holds UL1577 certification (file E351759) for 3000VRMS isolation, cUL recognition to CSA Bulletin 5A, and VDE 0884-11:2017-01 certification for Basic Insulation in the narrow SOIC package. It meets DIN VDE V 0884-11 requirements including 4200VPK transient voltage and 630VPK repetitive peak isolation voltage.
Can the MAX12931BASA+ operate with only one side powered?
No - the MAX12931BASA+ requires both VDDA and VDDB to be powered for functional operation. If either supply drops below its undervoltage-lockout threshold (1.5V–1.66V), the corresponding side enters a high-impedance or default-output state. The device does not support partial-power operation; both sides must be within 1.71V–5.5V for guaranteed data transfer across the isolation barrier.
MAX12931BASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs (Typ)
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 32.5ns, 33.6ns
- Pulse Width Distortion (Max):
- 4ns
- 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:
- 8-SOIC
MAX12931BASA+ FAQ
1.How can I place an order for MAX12931BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931BASA+ 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 MAX12931BASA+ reliable?
The price and inventory of MAX12931BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931BASA+ is usually 5 days.
3.What payment methods are accepted for MAX12931BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931BASA+?
MAX12931BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931BASA+ 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 MAX12931BASA+?
For technical support, including MAX12931BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931BASA+ requirements.
6.How does Aetrix verify that MAX12931BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX12931BASA+ 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 MAX12931BASA+ meets industry standards.
7.What is the process for return or replacement of MAX12931BASA+?
All MAX12931BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931BASA+, 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 MAX12931BASA+ part is unused and in its original packaging.
Return procedure for MAX12931BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931BASA+ Tags
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