My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX12931BAWE+
- Part No.:
- MAX12931BAWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX12931BAWE+.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:134
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX12931BAWE+ 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 up to 25Mbps data rate with 1.71V–5.5V dual supplies and 50kV/µs CMTI. It isolates TX/RX lines in isolated transceivers such as RS-485 or CAN interfaces while consuming only 1.3mW per channel at 2Mbps (3.3V).
For engineers reviewing the MAX12931BAWE+ datasheet, MAX12931BAWE+ pinout, MAX12931BAWE+ application, or MAX12931BAWE+ equivalent, key selection criteria include channel directionality (opposite-direction), default output state (low), narrow-body creepage (4mm), VIOWM (445VRMS), and compatibility with 1.8V/3.3V/5V logic domains across isolated power domains.
Technical Context
The MAX12931BAWE+ implements capacitive-based galvanic isolation using Maxim's proprietary process, with two independent unidirectional channels operating in opposite directions-IN1→OUT1 on Side A and IN2←OUT2 on Side B-enabling full-duplex UART isolation. Its refresh circuit maintains output accuracy during static input conditions.
It features independent VDDA/GNDA and VDDB/GNDB supply domains, enabling level translation between 1.71V and 5.5V logic families. Undervoltage lockout (1.5V–1.66V threshold) ensures reliable startup and fault recovery without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (UL1577), 445VRMS continuous working voltage (VIOWM)-supports reinforced insulation in industrial I/O modules. |
| Data Rate | 25Mbps maximum (B/E variant)-sufficient for isolated RS-485 at 10Mbps or CAN FD at 5Mbps with margin. |
| CMTI | 50kV/µs typical-ensures robust operation in high-noise motor drives or inverters with fast switching transients. |
| Supply Range | VDDA & VDDB: 1.71V to 5.5V independently-enables direct interface to 1.8V microcontrollers and 3.3V/5V peripherals without level shifters. |
| Power @ 2Mbps | 1.3mW per channel at 3.3V-reduces thermal load in space-constrained PLC backplanes or battery-powered gateways. |
| Default Output | Low (suffix 'B')-prevents spurious activation of downstream drivers during power-up or open-circuit faults. |
| Operating Temp | -40°C to +125°C ambient-qualified for under-hood automotive, industrial control, and energy metering 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 | Must be bypassed with 0.1µF ceramic capacitor to GNDA; sets logic-high level for IN1/IN2 and OUT1/OUT2 reference. |
| 2: IN1 | Channel 1 input (Side A) | Receives signal from microcontroller TX; high-impedance CMOS input with 0.7×VDDA VIH threshold. |
| 3: IN2 | Channel 2 input (Side B) | Receives signal from transceiver RX; supports 1.71V–5.5V logic levels independent of VDDA. |
| 4: GNDA | Side A ground reference | Isolated ground domain for MCU side; must not be connected to GNDB except via isolation barrier. |
| 5: GNDB | Side B ground reference | Isolated ground domain for bus side; separates noisy fieldbus return from sensitive controller ground. |
| 6: OUT2 | Channel 2 output (Side B) | Drives transceiver TX line; push-pull output eliminates need for external pull-ups in RS-485 driver enable paths. |
| 7: OUT1 | Channel 1 output (Side A) | Drives MCU RX line; low-default state prevents false start bits during boot or brown-out. |
| 8: VDDB | Side B power supply | Bypassed to GNDB; enables level translation-e.g., 1.8V MCU ↔ 3.3V RS-485 transceiver. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel pairing | IN1→OUT1 and IN2←OUT2 configuration enables native full-duplex isolation for UART/RS-485 without external routing logic. |
| Low-power isolation | 0.65mW/channel at 2Mbps (1.8V) reduces heat in sealed enclosures and extends battery life in portable diagnostics tools. |
| High CMTI immunity | 50kV/µs minimum ensures reliable data transmission in variable-frequency drives where dV/dt exceeds 10kV/µs. |
| Independent dual-supply operation | VDDA and VDDB each support 1.71V–5.5V-allows interfacing 1.8V IoT sensors to 5V legacy PLC backplanes. |
| Integrated UVLO protection | 1.5V–1.66V undervoltage lockout with 45mV hysteresis prevents metastability during brown-out conditions in industrial power rails. |
Applications
| Industrial Fieldbus Isolation | Isolated CAN Transceiver Interface |
|---|---|
Use Scenario: Isolating RS-485 communication between a PLC CPU module and remote I/O terminals in factory automation. IC Role / Device Role / Timing Role: Bidirectional digital isolator separating controller-side UART (TX/RX) from bus-side differential transceiver signals. Use Value: Prevents ground loop currents and common-mode noise from disrupting 10Mbps RS-485 links over 1200m cable runs. | Use Scenario: Providing galvanic isolation between an automotive body control module MCU and a CAN FD transceiver in EV battery management systems. IC Role / Device Role / Timing Role: Full-duplex isolator handling simultaneous CAN TX and RX signals with <2ns channel-to-channel skew. Use Value: Enables 5Mbps CAN FD operation with 90ps peak jitter (C/F variant), meeting ISO 11898-2 timing budgets. |
| Medical Patient Monitoring | Isolated Battery Management System |
Use Scenario: Isolating serial communication between patient-connected ECG front-end and hospital-grade host processor in Class II medical devices. IC Role / Device Role / Timing Role: Safety-rated isolator providing 3kVRMS reinforced insulation between patient-accessible circuits and mains-referenced processing units. Use Value: Meets UL1577 and VDE 0884-11 Basic Insulation requirements while maintaining <24ns propagation delay at 3.3V. | Use Scenario: Isolating cell voltage monitoring ICs from the main BMS controller in lithium-ion battery packs for electric vehicles. IC Role / Device Role / Timing Role: Dual-channel isolator transferring ADC conversion results (Side A) and cell balancing commands (Side B) across high-voltage barriers. Use Value: Supports 445VRMS continuous working voltage (VIOWM) across 400V battery stacks, preventing leakage current-induced measurement errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7721D | 2-channel, 5000VRMS wide-body SOIC, 100Mbps max, default-high outputs | Higher isolation rating suits 480VAC industrial AC drives; lacks low-default option for fail-safe RX lines | Select when >3kVRMS working voltage or higher data rates are required; verify default-state compatibility with system boot sequence. |
| ADUM120N0BRZ-RL7 | 2-channel, 3750VRMS narrow SOIC, 150Mbps max, 1.7V–5.5V supplies, low-default outputs | Higher speed supports USB-to-UART bridges; slightly lower isolation (3.75kVRMS) limits use in high-altitude or pollution-degree-3 environments | Prefer for cost-sensitive consumer IoT gateways needing 150Mbps but not requiring 3kVRMS 60s certification. |
Compared with ISO7721D and ADUM120N0BRZ-RL7, the MAX12931BAWE+ offers optimal balance of 3kVRMS certification, low-default safety behavior, and 25Mbps performance for industrial RS-485/CAN nodes-without over-specifying isolation or speed where unnecessary.
Availability
MAX12931BAWE+ is available at Aetrix Electronics and suitable for industrial fieldbus nodes, isolated CAN interfaces, medical patient monitors, and battery management systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX12931BAWE+ 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+ belongs to the MAX12930/MAX12931 family of low-power, high-CMTI digital isolators designed specifically for robust signal integrity in harsh electromagnetic environments-such as motor drives, PLCs, and isolated sensor interfaces.
FAQ
What is the isolation voltage rating of the MAX12931BAWE+ and how is it certified?
The MAX12931BAWE+ is rated for 3kVRMS isolation for 60 seconds per UL1577 and certified to VDE 0884-11 Basic Insulation standards. It achieves this in an 8-pin narrow-body SOIC package with 4mm creepage/clearance and CTI ≥400 (Group II). Its continuous working voltage (VIOWM) is 445VRMS, making it suitable for reinforced insulation in industrial I/O modules operating up to 300VAC mains.
Does the MAX12931BAWE+ support different logic voltage levels on each side?
Yes, the MAX12931BAWE+ supports independent logic levels: VDDA (Side A) and VDDB (Side B) each operate from 1.71V to 5.5V. This enables true level-shifting-for example, interfacing a 1.8V microcontroller (VDDA = 1.8V) to a 3.3V RS-485 transceiver (VDDB = 3.3V) without external level translators. Input thresholds scale with respective supply voltages.
What does the 'B' in MAX12931BAWE+ indicate, and why does it matter for system design?
The 'B' suffix in MAX12931BAWE+ denotes low-default output behavior: outputs assume logic-low when inputs are unpowered or open-circuit. This is critical for fail-safe operation-e.g., preventing unintended activation of RS-485 driver enable pins or CAN TX lines during power-up sequences or cable disconnects. It eliminates need for external pull-down resistors in safety-critical paths.
How does the MAX12931BAWE+ handle electromagnetic interference in noisy environments?
The MAX12931BAWE+ delivers 50kV/µs typical common-mode transient immunity (CMTI), verified per VDE 0884-11. Its capacitive isolation architecture and internal refresh circuit reject fast dV/dt transients-such as those from IGBT switching in motor drives-without data corruption. This ensures reliable UART/RS-485 communication even when GNDA–GNDB common-mode voltage slews at >30kV/µs.
Can the MAX12931BAWE+ be used in automotive battery management systems?
Yes, the MAX12931BAWE+ is qualified for -40°C to +125°C operation and supports 445VRMS continuous working voltage (VIOWM), making it suitable for BMS applications isolating cell monitor ICs from controllers across 400V battery stacks. Its low power (1.3mW/channel @ 2Mbps) minimizes self-heating in sealed battery enclosures, and its UL/VDE certifications meet functional safety requirements for ASIL-B subsystems.
MAX12931BAWE+ 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:
- 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+ FAQ
1.How can I place an order for MAX12931BAWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931BAWE+ 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+ reliable?
The price and inventory of MAX12931BAWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931BAWE+ is usually 5 days.
3.What payment methods are accepted for MAX12931BAWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931BAWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931BAWE+?
MAX12931BAWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931BAWE+ 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+?
For technical support, including MAX12931BAWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931BAWE+ requirements.
6.How does Aetrix verify that MAX12931BAWE+ is sourced from the original manufacturer or authorized distributors?
All MAX12931BAWE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX12931BAWE+?
All MAX12931BAWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931BAWE+, 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+ part is unused and in its original packaging.
Return procedure for MAX12931BAWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931BAWE+ Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
