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Analog Devices Inc./Maxim Integrated MAX12931EASA+T
- Part No.:
- MAX12931EASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931EASA+T.pdf
- Description:
- DIGITAL ISOLATOR 3.75KVRMS 2CH
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
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Product details
Overview
MAX12931EASA+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 (C/F variant), 1.71V–5.5V dual-supply operation, and high CMTI of 50kV/µs. It isolates TX/RX lines in isolated transceivers such as RS-485 or CAN interfaces.
For engineers reviewing the MAX12931EASA+T datasheet, MAX12931EASA+T pinout, MAX12931EASA+T application, or MAX12931EASA+T equivalent, key selection criteria include channel directionality (opposite-direction), default output state (low), isolation rating (3kVRMS), supply voltage flexibility (1.71–5.5V per side), and thermal derating behavior at +125°C ambient.
Technical Context
The MAX12931EASA+T implements proprietary capacitive isolation 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 UART-level signal isolation without external direction control logic.
It supports independent 1.71V–5.5V supplies on each side (VDDA/GNDA and VDDB/GNDB), enabling level translation between disparate logic domains. Undervoltage lockout (1.5–1.66V threshold) ensures reliable startup and fault recovery across temperature (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (UL1577); VIOWM = 445VRMS continuous - meets reinforced insulation requirements for industrial fieldbus safety boundaries |
| Data Rate | 150Mbps (C/F variant) - enables high-speed isolated serial links including CAN FD and fast RS-485 |
| CMTI | 50kV/µs typical - suppresses false triggering in noisy motor drive or power converter environments |
| Supply Range | VDDA & VDDB: 1.71V–5.5V independently - allows direct interfacing with 1.8V microcontrollers and 3.3V/5V peripherals |
| Propagation Delay | tPLH/tPHL = 4.1–20.3ns (voltage- and temp-dependent) - supports timing-critical isolated feedback loops in digital power systems |
| Default Output State | Low - ensures safe de-asserted state on power loss or open-circuit input, critical for fail-safe transceiver control |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and battery management applications |
Pinout & Package
MAX12931EASA+T uses an 8-pin narrow-body SOIC package (S8MS-22, outline 21-0041) 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 for IN1/IN2 inputs and OUT1/OUT2 outputs on Side A |
| 2 - IN1 | Channel 1 input | Accepts logic signals referenced to GNDA; drives OUT1 on Side B with opposite-direction data flow |
| 3 - IN2 | Channel 2 input | Accepts logic signals referenced to GNDA; drives OUT2 on Side B - completes full-duplex path when paired with OUT1/IN1 |
| 4 - GNDA | Side A ground reference | Return path for VDDA, IN1, IN2; must be isolated from GNDB by PCB layout and system grounding scheme |
| 5 - GNDB | Side B ground reference | Return path for VDDB, OUT1, OUT2; forms isolated domain for transceiver-side logic |
| 6 - OUT2 | Channel 2 output | Drives logic loads referenced to GNDB; complements IN1→OUT1 to enable bidirectional UART isolation |
| 7 - OUT1 | Channel 1 output | Drives logic loads referenced to GNDB; provides RX path when IN1 is TX from microcontroller |
| 8 - VDDB | Side B power supply | Bypass with 0.1µF ceramic capacitor to GNDB; sets logic-high level for OUT1/OUT2 and accepts IN1/IN2 signals via isolation barrier |
Key Features
| Feature | Design Value |
|---|---|
| Opposite-direction channel pairing | Enables native full-duplex isolation for UART, RS-485, and CAN without external direction control or additional logic |
| 150Mbps high-speed operation (C/F) | Supports modern isolated communication protocols including CAN FD (5Mbps) and fast RS-485 (12Mbps+) with margin |
| 50kV/µs CMTI | Prevents metastability and bit errors in high-di/dt environments like motor drives and inverters |
| 1.71V–5.5V dual-supply flexibility | Eliminates level-shifter ICs when interfacing 1.8V MCUs with 3.3V/5V transceivers or sensors |
| Refresh circuitry | Maintains correct output state indefinitely during static input conditions - essential for watchdog or status signal isolation |
Applications
| Industrial Fieldbus Isolation | Isolated CAN Transceiver Interface |
|---|---|
Use Scenario: Isolating RS-485 PHY layer from controller in programmable logic controllers (PLCs) operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional digital isolator providing galvanic separation between MCU UART and RS-485 transceiver, with precise propagation delay matching for half-duplex timing compliance. Use Value: Prevents ground loop currents and high-voltage transients from damaging the controller while maintaining 25Mbps+ data integrity via 50kV/µs CMTI. | Use Scenario: Isolating CAN controller (e.g., STM32) from CAN transceiver (e.g., SN65HVD230) in battery management systems (BMS) requiring functional safety. IC Role / Device Role / Timing Role: Full-duplex isolator handling simultaneous TX and RX paths with low skew (<2ns channel-to-channel) to preserve CAN bit timing budgets. Use Value: Enables reinforced insulation per IEC 61800-5-1 while supporting CAN FD data phase speeds up to 5Mbps using 150Mbps-rated channels. |
| Medical Isolated Data Acquisition | Isolated Industrial Sensor Interface |
Use Scenario: Isolating analog front-end ADC interface from host processor in patient-connected ECG or EEG monitoring equipment. IC Role / Device Role / Timing Role: Digital isolator transferring SPI clock/data between isolated ADC and non-isolated microcontroller, with default-low outputs ensuring safe idle state during power sequencing. Use Value: Meets 445VRMS working voltage (VIOWM) and 3kVRMS withstand requirements for BF-rated medical devices per IEC 60601-1. | Use Scenario: Isolating digital sensor outputs (e.g., temperature, pressure) from main control unit in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Level-translating isolator accepting 1.8V sensor logic and driving 3.3V controller inputs while blocking 848VRMS common-mode surges. Use Value: Combines galvanic isolation and voltage translation in one device, reducing BOM count and PCB area versus discrete level shifter + isolator solutions. |
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, opposite-direction, 5kVRMS (wide SOIC), 150Mbps, default-low, 2.5–5.5V supplies | Higher isolation rating (5kVRMS) but requires wide SOIC footprint; no 1.8V support | Select when 5kVRMS certification (UL/VDE) and wider creepage are required; verify PCB land pattern compatibility |
| ISO6721DR | 2-channel, opposite-direction, 5000VRMS (wide SOIC), 50Mbps, default-high, 1.71–5.5V supplies | Lower max data rate (50Mbps); default-high output conflicts with fail-safe low-active transceiver control | Choose only if 50Mbps suffices and default-high logic aligns with system architecture; not suitable for CAN FD or fast RS-485 |
Compared with SI8621ED-B-IS and ISO6721DR, MAX12931EASA+T uniquely combines 1.8V operation, 150Mbps speed, 3kVRMS narrow-SOIC packaging, and default-low outputs - making it optimal for space-constrained, low-voltage, high-speed isolated UART designs where board real estate and power efficiency are critical.
Availability
MAX12931EASA+T is available at Aetrix Electronics and suitable for industrial automation, battery management systems, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX12931EASA+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 MAX12931EASA+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 and safety-critical systems.
FAQ
What is the isolation voltage rating of the MAX12931EASA+T?
The MAX12931EASA+T is rated for 3kVRMS isolation voltage for 60 seconds (VISO) and 445VRMS maximum working isolation voltage (VIOWM) in continuous operation. It complies with UL1577 and VDE 0884-11 Basic Insulation standards for narrow-body SOIC packages, with a comparative tracking index (CTI) ≥400 and 4mm minimum creepage/clearance.
Does the MAX12931EASA+T support 1.8V logic levels on both sides?
Yes, the MAX12931EASA+T supports independent 1.71V–5.5V supplies on both sides (VDDA and VDDB), enabling true 1.8V operation on either or both domains. This allows direct interfacing with 1.8V microcontrollers and peripherals without external level shifters, as confirmed in DC Electrical Characteristics tables for both IDDA and IDDB at VDDA = VDDB = 1.8V.
What is the default output state of the MAX12931EASA+T?
The MAX12931EASA+T has a default-low output state, meaning OUT1 and OUT2 assume logic-low when their respective inputs are unpowered or open-circuited. This behavior is specified in the General Description and Ordering Information section and is critical for fail-safe operation in transceiver control applications.
How does the MAX12931EASA+T differ from the MAX12930 series?
The MAX12931EASA+T features opposite-direction channel configuration (IN1→OUT1 and IN2←OUT2), making it ideal for full-duplex isolation like UART or RS-485. In contrast, the MAX12930 has same-direction channels (IN1→OUT1 and IN2→OUT2), suited for digital I/O expansion or parallel data isolation. Pinouts and functional diagrams confirm this fundamental architectural difference.
What safety certifications apply to the MAX12931EASA+T?
The MAX12931EASA+T holds UL1577 certification (file E351759) for 3000VRMS isolation and VDE 0884-11:2017-01 certification for Basic Insulation (VIORM = 630VPK, VIOWM = 445VRMS). These approvals cover the 8-pin narrow-body SOIC package and validate its use in reinforced insulation applications per IEC 61800-5-1 and IEC 60601-1.
MAX12931EASA+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:
- CAN, RS232, RS422, RS485
- 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:
- 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
MAX12931EASA+T FAQ
1.How can I place an order for MAX12931EASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931EASA+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 MAX12931EASA+T reliable?
The price and inventory of MAX12931EASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931EASA+T is usually 5 days.
3.What payment methods are accepted for MAX12931EASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931EASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931EASA+T?
MAX12931EASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931EASA+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 MAX12931EASA+T?
For technical support, including MAX12931EASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931EASA+T requirements.
6.How does Aetrix verify that MAX12931EASA+T is sourced from the original manufacturer or authorized distributors?
All MAX12931EASA+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 MAX12931EASA+T meets industry standards.
7.What is the process for return or replacement of MAX12931EASA+T?
All MAX12931EASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931EASA+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 MAX12931EASA+T part is unused and in its original packaging.
Return procedure for MAX12931EASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931EASA+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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