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Analog Devices Inc./Maxim Integrated MAX12931CASA+T
- Part No.:
- MAX12931CASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931CASA+T.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,079
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Product details
Overview
MAX12931CASA+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 up to 150Mbps 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 enabling level translation between disparate voltage domains.
For engineers reviewing the MAX12931CASA+T datasheet, MAX12931CASA+T pinout, MAX12931CASA+T application, or MAX12931CASA+T equivalent, this page delivers verified isolation parameters, channel directionality, safety certifications (UL1577, VDE 0884-11), thermal derating curves, and real-world use cases in industrial fieldbus and battery management systems.
Technical Context
The MAX12931CASA+T implements proprietary capacitive isolation technology with two unidirectional channels operating in opposite directions-IN1→OUT1 on Side A and IN2←OUT2 on Side B-enabling full-duplex signal transfer across isolated domains. Its refresh circuit maintains output state during static input conditions, and independent VDDA/GNDA and VDDB/GNDB supplies support true level-shifting functionality.
It features 50kV/µs common-mode transient immunity (CMTI), 90ps peak eye diagram jitter at 150Mbps, and propagation delay skew ≤2ns channel-to-channel (opposite direction). The device meets IEC 60747-5-5 insulation requirements with VIOWM = 445VRMS and VIOTM = 4200VPK, validated for operation from –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (UL1577); supports basic insulation per VDE 0884-11 in narrow SOIC |
| Max Data Rate | 150Mbps - enables high-speed isolated UART, SPI, or digital I/O in compact designs |
| CMTI | 50kV/µs typ - ensures robust noise immunity in noisy industrial environments like motor drives |
| Supply Range | 1.71V–5.5V per side - allows direct interfacing with 1.8V microcontrollers and 3.3V/5V peripherals |
| Propagation Delay | 4.1–20.3ns (VDD-dependent) - guarantees timing-critical signal integrity in real-time control loops |
| VIOWM | 445VRMS continuous working voltage - defines maximum steady-state isolation barrier stress |
| Package | 8-pin narrow-body SOIC (S8MS-22) - compatible with standard PCB assembly and space-constrained layouts |
Pinout & Package
MAX12931CASA+T uses an 8-pin narrow-body SOIC package (outline 21-0041, land pattern 90-0096) with CTI ≥400 (Group II creepage rating) and minimum creepage/clearance of 4mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VDDA | Side A power supply | Bypass with 0.1µF ceramic capacitor to GNDA; sets logic-high level on input side |
| 2: IN1 | Channel 1 input | Accepts digital signals from Side A; drives OUT1 on Side B (bidirectional flow) |
| 3: IN2 | Channel 2 input | Accepts digital signals from Side B; drives OUT2 on Side A - enables full-duplex isolation |
| 4: GNDA | Side A ground reference | Reference for VDDA, IN1, and IN2; must be isolated from GNDB |
| 5: GNDB | Side B ground reference | Reference for VDDB, OUT1, and OUT2; forms isolation barrier with GNDA |
| 6: OUT2 | Channel 2 output | Drives Side A logic; complements IN2 to complete RX path in transceiver isolation |
| 7: OUT1 | Channel 1 output | Drives Side B logic; complements IN1 to complete TX path in transceiver isolation |
| 8: VDDB | Side B power supply | Bypass with 0.1µF ceramic capacitor to GNDB; sets logic-high level on output side |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Channel Pairing | IN1→OUT1 and IN2←OUT2 configuration enables native full-duplex isolation without external routing |
| High-Speed 150Mbps Operation | Supports modern isolated communication protocols including fast UART and digital sensor interfaces |
| Low-Power Isolation | 3.3mW/channel at 100Mbps with 1.8V supplies - reduces thermal load in dense PCB layouts |
| Integrated Refresh Circuit | Maintains correct output state during indefinite DC input conditions - eliminates need for external watchdog timers |
| Wide Supply Compatibility | 1.71V–5.5V per side allows interoperability between legacy 5V systems and modern ultra-low-voltage MCUs |
Applications
| Industrial Fieldbus Isolation | Isolated CAN Transceiver Interface |
|---|---|
Use Scenario: Isolating RS-485 differential bus nodes in factory automation PLCs to prevent ground loop currents and ESD damage. IC Role / Device Role / Timing Role: Bidirectional isolator separating controller-side logic (Side A) from bus-side transceiver (Side B), preserving signal integrity at up to 150Mbps. Use Value: Enables reliable multi-drop communication over long cables in electrically noisy environments while meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Galvanically isolating CAN FD controller and transceiver in battery management systems (BMS) to protect low-voltage MCU from high-voltage pack domains. IC Role / Device Role / Timing Role: Provides separate TX and RX isolation paths with matched propagation delay (<2ns skew) to maintain CAN bit timing accuracy. Use Value: Supports CAN FD data rates up to 5Mbps with deterministic latency and 445VRMS continuous working voltage for functional safety compliance. |
| Medical Sensor Signal Isolation | Isolated Digital I/O for Motor Drives |
Use Scenario: Isolating analog front-end ADC interface signals in patient-connected medical devices to meet IEC 60601-1 creepage and leakage current requirements. IC Role / Device Role / Timing Role: Transfers digital status/control signals across isolation barrier while maintaining 3kVRMS withstand rating and Group II CTI material classification. Use Value: Achieves reinforced insulation certification (UL1577 + VDE 0884-11) in compact 8-pin SOIC, reducing board area vs. optocoupler-based solutions. | Use Scenario: Isolating gate driver enable/disable and fault feedback signals in three-phase inverter modules to prevent latch-up during high dv/dt switching events. IC Role / Device Role / Timing Role: Delivers 50kV/µs CMTI and <20ns propagation delay to ensure precise timing alignment between PWM commands and fault responses. Use Value: Prevents false triggering in high-noise motor drive environments while supporting safe shutdown sequences under fault conditions. |
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, bidirectional, 150Mbps, 5kVRMS wide-SOIC; higher VIOWM (848VRMS) | Requires wider 16-pin SOIC footprint; better suited for high-working-voltage AC mains interfaces | Select when >445VRMS continuous isolation is required and PCB layout accommodates wider package |
| ISO6721DR | 2-channel, bidirectional, 50Mbps, 5000VRMS; lower max data rate but higher CMTI (75kV/µs) | Optimized for ultra-noisy environments (e.g., EV chargers); not suitable for 150Mbps protocols | Choose for cost-sensitive industrial applications where 50Mbps suffices and extreme CMTI is critical |
Compared with Si8621ED-B-IS and ISO6721DR, the MAX12931CASA+T offers the optimal balance of 150Mbps speed, 3kVRMS isolation in a compact 8-pin SOIC, and 1.71V–5.5V dual-supply flexibility-making it ideal for space-constrained, high-speed isolated interfaces where VIOWM ≤445VRMS is acceptable.
Availability
MAX12931CASA+T is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated CAN interfaces, and medical sensor signal isolation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX12931CASA+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 MAX12931CASA+T belongs to Analog Devices' MAX12930/MAX12931 family of low-power, high-speed digital isolators designed specifically for full-duplex isolated communication in space-constrained, thermally sensitive applications.
FAQ
What is the isolation voltage rating of the MAX12931CASA+T?
The MAX12931CASA+T is rated for 3kVRMS isolation voltage for 60 seconds per UL1577 and meets VDE 0884-11 Basic Insulation requirements in its 8-pin narrow-body SOIC package. Its maximum working isolation voltage (VIOWM) is 445VRMS, and it withstands 4200VPK transient voltage, making it suitable for reinforced insulation in industrial and medical applications.
Does the MAX12931CASA+T support bidirectional signal flow?
Yes, the MAX12931CASA+T implements true bidirectional isolation via two unidirectional channels operating in opposite directions: IN1 on Side A drives OUT1 on Side B, while IN2 on Side B drives OUT2 on Side A. This architecture enables native full-duplex isolation for transceivers like RS-485 and CAN without external signal routing.
What are the supply voltage requirements for MAX12931CASA+T?
The MAX12931CASA+T requires independent supplies: VDDA (1.71V–5.5V) referenced to GNDA for Side A, and VDDB (1.71V–5.5V) referenced to GNDB for Side B. Each supply must be bypassed with a 0.1µF ceramic capacitor. This dual-supply architecture enables level translation between disparate voltage domains, such as 1.8V MCU and 3.3V transceiver.
How does the MAX12931CASA+T handle static input conditions?
The MAX12931CASA+T incorporates an internal refresh circuit that periodically samples input states and updates outputs-even when inputs remain static indefinitely. This prevents output drift or metastability in applications with long DC periods, eliminating the need for external refresh pulses or watchdog circuits in systems like isolated digital I/O or sensor monitoring.
Is the MAX12931CASA+T RoHS compliant and lead-free?
Yes, the MAX12931CASA+T is RoHS compliant and lead-free. The "+T" suffix indicates tape-and-reel packaging with lead-free (Pb-free) termination finish, fully compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) 3 specifications.
MAX12931CASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 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+T FAQ
1.How can I place an order for MAX12931CASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931CASA+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 MAX12931CASA+T reliable?
The price and inventory of MAX12931CASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931CASA+T is usually 5 days.
3.What payment methods are accepted for MAX12931CASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931CASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931CASA+T?
MAX12931CASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931CASA+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 MAX12931CASA+T?
For technical support, including MAX12931CASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931CASA+T requirements.
6.How does Aetrix verify that MAX12931CASA+T is sourced from the original manufacturer or authorized distributors?
All MAX12931CASA+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 MAX12931CASA+T meets industry standards.
7.What is the process for return or replacement of MAX12931CASA+T?
All MAX12931CASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931CASA+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 MAX12931CASA+T part is unused and in its original packaging.
Return procedure for MAX12931CASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931CASA+T 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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