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Analog Devices Inc./Maxim Integrated MAX12931BAWE+T
- Part No.:
- MAX12931BAWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX12931BAWE+T.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
MAX12931BAWE+T from Analog Devices is a two-channel, bidirectional digital galvanic isolator in an 8-pin narrow-body SOIC package, rated for 3kVRMS isolation (60s), supporting 25Mbps data rate with 50kV/µs CMTI and 1.71V–5.5V dual-supply operation. It isolates TX/RX lines in isolated transceivers such as RS-485 or CAN interfaces while consuming only 0.65mW per channel at 2Mbps with 1.8V supplies.
For engineers reviewing the MAX12931BAWE+T datasheet, MAX12931BAWE+T pinout, MAX12931BAWE+T application, or MAX12931BAWE+T equivalent, key selection criteria include confirmed bidirectional channel configuration (IN1→OUT2 / OUT1←IN2), 3kVRMS narrow-SOIC safety rating, VDDA/VDDB level-shifting capability, and compatibility with industrial fieldbus and battery management systems requiring robust noise immunity and low-power operation.
Technical Context
The MAX12931BAWE+T implements proprietary capacitive isolation technology enabling galvanic separation between side A (VDDA/GNDA) and side B (VDDB/GNDB), with independent 1.71V–5.5V supplies permitting level translation across domains. Its bidirectional channel mapping-IN1 on side A drives OUT2 on side B, while IN2 on side B drives OUT1 on side A-enables full-duplex UART isolation without external signal routing.
It features integrated refresh circuitry to maintain output state during indefinite DC input conditions, undervoltage lockout (1.5V–1.66V threshold) on both sides, and push-pull outputs eliminating external pull-ups. The device meets UL1577 (3kVRMS), CSA Bulletin 5A, and VDE 0884-11 Basic Insulation standards for narrow-body SOIC packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (UL/VDE certified); enables safe interface between 24V industrial bus and 3.3V microcontroller domains |
| Data Rate | 25Mbps (B/E variant); supports high-speed RS-485 communication up to 25 million transitions/sec |
| CMTI | 50kV/µs typical; rejects fast common-mode transients in motor drives and power converters |
| Supply Range | VDDA & VDDB: 1.71V–5.5V independently; allows level shifting between 1.8V logic and 5V peripherals |
| Propagation Delay | 16.9–33.7ns (tPHL/tPLH); ensures timing predictability in real-time control loops |
| Power @ 2Mbps | 0.65mW per channel at 1.8V; reduces thermal load in space-constrained battery-powered modules |
| Operating Temp | -40°C to +125°C ambient; qualified for under-hood automotive and industrial PLC environments |
Pinout & Package
Package: 8-pin narrow-body SOIC (S8MS-22), CTI ≥400 (Group II), creepage/clearance ≥4mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDDA | Side A power supply | Bypass with 0.1µF ceramic capacitor to GNDA; sets logic-high level for IN1/IN2 inputs |
| 2 - IN1 | Channel 1 input (side A) | Drives OUT2 on side B; accepts 1.71V–5.5V logic; hysteresis = 410mV (B/E) |
| 3 - IN2 | Channel 2 input (side B) | Drives OUT1 on side A; referenced to GNDB; enables full-duplex RX/TX isolation |
| 4 - GNDA | Side A ground reference | Return path for VDDA, IN1, IN2; must be isolated from GNDB by PCB layout |
| 5 - GNDB | Side B ground reference | Return path for VDDB, OUT1, OUT2; separates noisy power domain from sensitive MCU |
| 6 - OUT2 | Channel 2 output (side B) | Sinks/sourcing 4mA; VOH = VDDA − 0.4V, VOL = 0.4V; push-pull eliminates pull-up resistors |
| 7 - OUT1 | Channel 1 output (side A) | Driven by IN2 on side B; provides isolated TX path back to MCU; rail-to-rail compatible |
| 8 - VDDB | Side B power supply | Bypass with 0.1µF ceramic capacitor to GNDB; sets logic levels for OUT1/OUT2 outputs |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel architecture | IN1→OUT2 and IN2→OUT1 mapping enables native UART/RS-485 transceiver isolation without external cross-wiring |
| Independent dual-supply operation | VDDA and VDDB each support 1.71V–5.5V, allowing 1.8V MCU to communicate with 5V sensor or actuator |
| High CMTI (50kV/µs) | Prevents data corruption in high-noise environments like motor drives, inverters, and factory automation |
| Refresh circuitry | Maintains correct output state during static input conditions, eliminating watchdog timer dependency in safety-critical systems |
| Integrated UVLO with hysteresis | 1.5V–1.66V threshold with 45mV hysteresis prevents metastability during brown-out or power sequencing |
Applications
| Industrial Fieldbus Isolation | Isolated CAN Transceiver Interface |
|---|---|
Use Scenario: Isolating RS-485 nodes in PROFIBUS or Modbus networks exposed to ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional isolator separating controller-side logic (GNDA) from bus-side transceiver (GNDB), handling simultaneous TX/RX signaling. Use Value: Prevents ground-loop currents and common-mode noise from disrupting communication; 3kVRMS withstand enables compliance with IEC 61000-4-5 surge immunity requirements. | Use Scenario: Adding galvanic isolation between a CAN controller (e.g., STM32) and physical CAN transceiver (e.g., SN65HVD230) in battery management systems. IC Role / Device Role / Timing Role: Provides separate, directionally matched channels for CAN_H/CAN_L differential signals with sub-34ns propagation delay matching. Use Value: Eliminates risk of controller damage from bus faults; 25Mbps rating supports CAN FD arbitration phase; 50kV/µs CMTI suppresses switching noise from adjacent DC-DC converters. |
| Medical Patient Monitoring Interface | Isolated Battery Cell Supervision |
Use Scenario: Isolating analog front-end ADCs and digital controllers in ECG or EEG devices where patient-connected circuits require reinforced insulation. IC Role / Device Role / Timing Role: Transfers digital control and status signals across isolation barrier while maintaining 3kVRMS patient safety separation. Use Value: Meets IEC 60601-1 creepage/clearance requirements via Group II package (CTI ≥400); low 0.65mW/channel power minimizes heat near patient contact points. | Use Scenario: Communicating voltage/temperature readings from isolated cell monitoring ICs (e.g., BQ769x0) to system MCU in multi-cell Li-ion packs. IC Role / Device Role / Timing Role: Isolates SPI or UART data streams between high-side cell supervisor (GNDB) and low-side host processor (GNDA). Use Value: Enables safe hot-swap and fault containment; 1.71V–5.5V supply range matches both 1.8V supervisory ICs and 3.3V MCUs; -40°C to +125°C rating covers battery thermal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO6721DR | 2-channel, unidirectional, 5000VRMS wide-SOIC, 50Mbps max, 1.62V–5.5V supply | Requires external signal routing for bidirectional UART; higher isolation but larger footprint | Select when 5kVRMS and higher data rate are required, and board space permits wide SOIC |
| ADUM120N0BRZ-RL7 | 2-channel, bidirectional, 3750VRMS, 150Mbps, 1.7V–5.5V, 8-pin SOIC | Higher speed (150Mbps) and slightly higher isolation (3.75kVRMS), but no default-output state option | Select when 150Mbps operation is needed for CAN FD data phase or high-throughput diagnostics |
Compared with ISO6721DR and ADUM120N0BRZ-RL7, the MAX12931BAWE+T uniquely combines confirmed bidirectional pinout (IN1→OUT2/IN2→OUT1), 3kVRMS narrow-SOIC packaging, and 25Mbps operation optimized for cost-sensitive industrial RS-485 nodes-offering the most direct functional match for full-duplex transceiver isolation without layout redesign.
Availability
MAX12931BAWE+T is available at Aetrix Electronics and suitable for industrial fieldbus nodes, isolated CAN interfaces, and medical patient-monitoring systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX12931BAWE+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 MAX12931BAWE+T belongs to Analog Devices' MAX12930/MAX12931 family of low-power, high-CMTI digital isolators designed specifically for robust signal isolation in harsh electromagnetic environments-including factory automation, energy infrastructure, and battery-powered safety-critical systems.
FAQ
What is the isolation voltage rating of the MAX12931BAWE+T?
The MAX12931BAWE+T is rated for 3kVRMS isolation voltage for 60 seconds per UL1577 and VDE 0884-11 Basic Insulation standards. Its narrow-body SOIC package has a minimum CTI of 400 (Group II), with 4mm creepage and clearance distances. This rating applies to continuous operation in single-protection configurations within defined pollution degree and climate categories.
Does the MAX12931BAWE+T support level shifting between different logic voltages?
Yes, the MAX12931BAWE+T supports true level shifting: VDDA (side A) and VDDB (side B) operate independently over 1.71V–5.5V. For example, it can translate 1.8V logic from a microcontroller on side A to 3.3V or 5V logic on side B, enabling interoperability between mixed-voltage subsystems without external level translators.
How does the bidirectional channel configuration of the MAX12931BAWE+T differ from the MAX12930?
The MAX12931BAWE+T has opposite-direction channels: IN1 on side A drives OUT2 on side B, and IN2 on side B drives OUT1 on side A-ideal for full-duplex UART/RS-485. In contrast, the MAX12930 has same-direction channels (IN1→OUT1, IN2→OUT2), suited for digital I/O expansion or parallel data isolation.
What is the maximum data rate supported by the MAX12931BAWE+T?
The MAX12931BAWE+T is the B/E variant of the MAX12931 family and supports a maximum data rate of 25Mbps. This is confirmed in the Dynamic Characteristics table for MAX1293_B/E, with propagation delay skew ≤2ns and peak jitter of 250ps at 25Mbps-making it suitable for high-reliability RS-485 and CAN applications.
Is the MAX12931BAWE+T pin-compatible with other members of the MAX12930/MAX12931 family in the same package?
Yes, all 8-pin narrow-body SOIC variants-including MAX12930BAWE+T, MAX12931BAWE+T, MAX12930CAWE+T, and MAX12931CAWE+T-share identical pinouts and footprints. Differences lie in data rate (B/E = 25Mbps, C/F = 150Mbps) and default output state (A/B suffixes), not pin function or mechanical layout.
MAX12931BAWE+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:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- 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:
- 16-SOIC
MAX12931BAWE+T FAQ
1.How can I place an order for MAX12931BAWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931BAWE+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 MAX12931BAWE+T reliable?
The price and inventory of MAX12931BAWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931BAWE+T is usually 5 days.
3.What payment methods are accepted for MAX12931BAWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931BAWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931BAWE+T?
MAX12931BAWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931BAWE+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 MAX12931BAWE+T?
For technical support, including MAX12931BAWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931BAWE+T requirements.
6.How does Aetrix verify that MAX12931BAWE+T is sourced from the original manufacturer or authorized distributors?
All MAX12931BAWE+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 MAX12931BAWE+T meets industry standards.
7.What is the process for return or replacement of MAX12931BAWE+T?
All MAX12931BAWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931BAWE+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 MAX12931BAWE+T part is unused and in its original packaging.
Return procedure for MAX12931BAWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931BAWE+T Tags
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