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Analog Devices Inc./Maxim Integrated MAX12931CASA+
- Part No.:
- MAX12931CASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931CASA+.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,055
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Product details
Overview
MAX12931CASA+ from Analog Devices is a two-channel, bidirectional digital isolator in an 8-pin narrow-body SOIC package, rated for 3kVRMS isolation (60s), supporting up to 150Mbps data rate with 1.71V–5.5V dual supplies and 50kV/µs CMTI. It isolates TX/RX lines in isolated transceivers while enabling level translation between disparate voltage domains.
For engineers reviewing the MAX12931CASA+ datasheet, MAX12931CASA+ pinout, MAX12931CASA+ application, or MAX12931CASA+ equivalent, this page delivers verified electrical specs, safety-rated insulation parameters, channel directionality confirmation, thermal derating curves, and real-world isolation use cases - all aligned to the C/F-speed variant in narrow SOIC.
Technical Context
The MAX12931CASA+ implements proprietary capacitive isolation with refresh circuitry to maintain output state during indefinite DC input conditions. Its two unidirectional channels operate in opposite directions (IN1→OUT1 on Side A, IN2←OUT2 on Side B), enabling full-duplex UART/RS-485 isolation without external direction control logic.
It features independent 1.71V–5.5V VDDA and VDDB supplies, allowing true level-shifting across domains (e.g., 1.8V microcontroller ↔ 3.3V transceiver), with undervoltage lockout (1.5V–1.66V threshold) and 50kV/µs common-mode transient immunity ensuring robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS withstand for 60s (UL1577); 445VRMS working voltage - certifies safe operation in reinforced insulation systems per IEC 60747-5-5. |
| Max Data Rate | 150Mbps - supports high-speed serial interfaces including isolated CAN FD and RS-485 at >50MBaud. |
| CMTI | 50kV/µs typical - prevents false triggering during fast transients in motor drives or power converters. |
| Supply Range | VDDA & VDDB: 1.71V–5.5V independently - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic without level shifters. |
| Propagation Delay | 4.1ns–20.3ns (tPLH), 4.3ns–21.7ns (tPHL) - guarantees sub-10ns timing at 3.3V/5V, critical for synchronous serial protocols. |
| Peak Eye Jitter | 90ps at 150Mbps - ensures clean signal integrity for high-speed eye diagram compliance in USB or industrial Ethernet PHY isolation. |
| Operating Temp | -40°C to +125°C ambient - qualified for under-hood automotive, factory-floor PLC, and battery management systems. |
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 to GNDA; sets logic-high level for IN1/IN2 and OUT1/OUT2 referenced to GNDA. |
| 2 - IN1 | Channel 1 input (Side A) | Accepts 1.71V–5.5V logic; drives OUT1 on Side B; default state determined by suffix (C = default-low). |
| 3 - IN2 | Channel 2 input (Side B) | Accepts 1.71V–5.5V logic; drives OUT2 on Side A; enables bidirectional data flow (IN1→OUT1, IN2→OUT2). |
| 4 - GNDA | Side A ground reference | Return path for VDDA, IN1, IN2; must be isolated from GNDB; connects to low-noise digital ground of controller side. |
| 5 - GNDB | Side B ground reference | Return path for VDDB, OUT1, OUT2; isolated from GNDA; connects to transceiver or field-side ground. |
| 6 - OUT2 | Channel 2 output (Side A) | Push-pull CMOS/TTL-compatible output driven by IN2; no pull-up required; sinks/sours 4mA. |
| 7 - OUT1 | Channel 1 output (Side B) | Push-pull CMOS/TTL-compatible output driven by IN1; complements IN2/OUT2 for full-duplex isolation. |
| 8 - VDDB | Side B power supply | Bypass with 0.1µF ceramic to GNDB; sets logic-high level for OUT1/OUT2 and accepts IN2 referenced to GNDB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Channel Pairing | IN1→OUT1 and IN2→OUT2 configuration enables native full-duplex isolation for UART, RS-485, and SPI clock/data lines without direction-control pins. |
| 150Mbps High-Speed Operation | Supports isolated communication links requiring >100MBaud throughput, such as industrial Ethernet PHY interfaces or high-resolution encoder feedback. |
| 50kV/µs CMTI | Prevents metastability or bit errors during fast dv/dt events in variable-frequency drives, inverters, and HV battery monitoring systems. |
| Dual Independent Supplies | VDDA and VDDB each support 1.71V–5.5V, enabling seamless level translation between 1.8V MCU and 5V analog front-end or 3.3V transceiver. |
| Refresh Circuitry | Maintains correct output state during indefinite DC input (e.g., idle bus), eliminating need for external watchdog or periodic toggling. |
Applications
| Isolated RS-485 Transceiver Interface | Battery Management System (BMS) Cell Monitoring |
|---|---|
Use Scenario: Isolating half-duplex RS-485 transceivers in industrial fieldbus networks exposed to ground loops and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional isolator providing galvanic separation between MCU UART (Side A) and RS-485 driver/receiver (Side B), with matched propagation delay for timing-critical DE/RE control. Use Value: Enables reliable 150Mbps link budget margin, 445VRMS working voltage withstand, and 50kV/µs noise rejection in ±2kV ESD/±4kV EFT environments. | Use Scenario: Isolating cell voltage measurement ICs from main BMS controller across 400V+ battery stacks in EV traction packs. IC Role / Device Role / Timing Role: Dual-channel isolator transferring ADC conversion results (IN1) and daisy-chain clock signals (IN2) across high-voltage barrier with <10ns skew. Use Value: Supports 1.8V/3.3V mixed-domain signaling, maintains 125°C operation, and provides 3kVRMS isolation certified to UL1577 for functional safety compliance. |
| Medical Patient Monitoring Interface | Industrial PLC Digital I/O Module |
Use Scenario: Isolating ECG/EEG analog front-end digital control lines from patient-connected circuits to meet IEC 60601-1 2×MOPP requirements. IC Role / Device Role / Timing Role: Provides reinforced insulation barrier for SPI-configured sensor ICs and GPIO status reporting, with default-low outputs preventing spurious actuation during power-up. Use Value: Delivers 3kVRMS withstand, 445VRMS working voltage, and 125°C rating suitable for sealed, convection-cooled medical enclosures. | Use Scenario: Isolating 24VDC field-side digital inputs/outputs from 3.3V PLC CPU backplane in harsh factory environments. IC Role / Device Role / Timing Role: Bidirectional isolator handling both input status reads (IN1→OUT1) and output command writes (IN2→OUT2) across 2500V surge zones. Use Value: Withstands ±10kV 1.2/50µs surges, supports 150Mbps for fast diagnostics, and operates reliably at -40°C for outdoor automation cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8621ED-B-IS | 2-channel, 150Mbps, 5kVRMS wide-SOIC; higher VIOWM (848VRMS); no default-low option in ED suffix. | Requires wider PCB footprint (16-pin SOIC); better suited for mains-connected equipment needing 5kVRMS. | Select when 5kVRMS certification and higher working voltage are mandatory; not drop-in due to package and pinout differences. |
| ISO6721DR | 2-channel, 50Mbps, 5000VRMS; 16-pin SOIC; lower max speed; TI's capacitive isolation. | Limited to ≤50Mbps applications; lacks 150Mbps capability needed for high-throughput BMS or industrial Ethernet. | Choose for cost-sensitive designs where 50Mbps suffices and TI ecosystem integration is preferred; not suitable for 150Mbps timing-critical links. |
Compared with SI8621ED-B-IS and ISO6721DR, the MAX12931CASA+ offers the only 8-pin, 150Mbps, 3kVRMS isolator with confirmed bidirectional channel pairing and 1.71V–5.5V dual-supply flexibility - making it optimal for space-constrained, high-speed, mixed-voltage isolation where board area and timing margin are critical.
Availability
MAX12931CASA+ is available at Aetrix Electronics and suitable for isolated RS-485 transceivers, battery management system (BMS) cell monitors, and medical patient interface modules requiring stable component supply across automotive, industrial, and healthcare design cycles.
Supply support for MAX12931CASA+ 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 MAX12931CASA+ belongs to the MAX12930/MAX12931 family of low-power, high-CMTI digital isolators designed specifically for robust galvanic isolation in space-constrained, high-noise, and safety-critical applications.
FAQ
What is the maximum data rate supported by the MAX12931CASA+?
The MAX12931CASA+ supports a maximum data rate of 150Mbps, as confirmed by its C/F speed grade designation in the datasheet. This is validated across the full 1.71V–5.5V supply range and -40°C to +125°C operating temperature, with peak eye jitter of 90ps at 150Mbps ensuring signal integrity in high-speed serial links.
Does the MAX12931CASA+ support bidirectional communication natively?
Yes, the MAX12931CASA+ implements native bidirectional isolation via two unidirectional channels operating in opposite directions: IN1 on Side A drives OUT1 on Side B, and IN2 on Side B drives OUT2 on Side A. This eliminates external direction-control logic and is explicitly optimized for isolated UART, RS-485, and SPI interfaces.
What isolation voltage rating applies to the MAX12931CASA+ package?
The MAX12931CASA+ uses an 8-pin narrow-body SOIC package rated for 3kVRMS isolation withstand voltage for 60 seconds (UL1577), with a maximum working voltage (VIOWM) of 445VRMS and transient voltage (VIOTM) of 4200VPK - all verified per IEC 60747-5-5 and documented in Table 1 of the datasheet.
Can the MAX12931CASA+ operate with different supply voltages on each side?
Yes, the MAX12931CASA+ supports independent VDDA (Side A) and VDDB (Side B) supplies ranging from 1.71V to 5.5V each. This allows true level translation - for example, interfacing a 1.8V microcontroller (VDDA = 1.8V) with a 3.3V RS-485 transceiver (VDDB = 3.3V) - without external level shifters.
What is the default output state of the MAX12931CASA+?
The MAX12931CASA+ has a default-low output state, indicated by the "C" suffix in its part number per the Ordering Information table. When either input is unpowered or open-circuit, both OUT1 and OUT2 assume a logic-low state - a critical safety feature for fail-safe control in industrial and medical applications.
MAX12931CASA+ 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:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs (Typ)
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 9.2ns, 9.4ns
- Pulse Width Distortion (Max):
- 2ns
- 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
MAX12931CASA+ FAQ
1.How can I place an order for MAX12931CASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931CASA+ 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 MAX12931CASA+ reliable?
The price and inventory of MAX12931CASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931CASA+ is usually 5 days.
3.What payment methods are accepted for MAX12931CASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931CASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931CASA+?
MAX12931CASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931CASA+ 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 MAX12931CASA+?
For technical support, including MAX12931CASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931CASA+ requirements.
6.How does Aetrix verify that MAX12931CASA+ is sourced from the original manufacturer or authorized distributors?
All MAX12931CASA+ 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 MAX12931CASA+ meets industry standards.
7.What is the process for return or replacement of MAX12931CASA+?
All MAX12931CASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931CASA+, 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 MAX12931CASA+ part is unused and in its original packaging.
Return procedure for MAX12931CASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931CASA+ 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
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