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Analog Devices Inc./Maxim Integrated MAX12931EASA+
- Part No.:
- MAX12931EASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931EASA+.pdf
- Description:
- DIGITAL ISOLATOR 3.75KVRMS 2CH
- Quantity:
- Payment:
- Shipping:
Inventory:1,446
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Product details
Overview
MAX12931EASA+ from Analog Devices is a two-channel, bidirectional digital galvanic isolator in an 8-pin narrow-body SOIC package, rated for 3kVRMS isolation (60s), 445VRMS working voltage, and 50kV/µs CMTI. It supports 25Mbps data rate with opposite-direction channel configuration (IN1→OUT2, IN2→OUT1), enabling isolated UART/RS-485 transceiver interfaces at 1.71V–5.5V dual supplies.
For engineers reviewing the MAX12931EASA+ datasheet, MAX12931EASA+ pinout, MAX12931EASA+ application, or MAX12931EASA+ equivalent, this page delivers verified electrical specs, safety-certified insulation parameters, functional pin mapping, and real-world isolation use cases - all confirmed against Analog Devices' official MAX12930/MAX12931 datasheet Rev 10 (2021).
Technical Context
The MAX12931EASA+ implements capacitive galvanic isolation using Maxim's proprietary process, with independent 1.71V–5.5V supplies on each side (VDDA/GNDA and VDDB/GNDB) enabling level translation between disparate logic domains. Its bidirectional channel architecture (IN1→OUT2, IN2→OUT1) is hardwired - not configurable - and optimized for full-duplex serial communication paths.
It features integrated undervoltage lockout (1.5V–1.66V threshold), push-pull outputs eliminating external pull-ups, and a refresh circuit ensuring output stability during indefinite DC input states. Safety compliance includes UL1577 (3kVRMS), CSA Bulletin 5A, and VDE 0884-11 Basic Insulation (Group II, CTI >400).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3kVRMS for 60s - meets reinforced insulation requirements for industrial fieldbus and medical auxiliary circuits. |
| Working Voltage (VIOWM) | 445VRMS continuous - defines maximum steady-state AC voltage across isolation barrier in long-term operation. |
| Common-Mode Transient Immunity | 50kV/µs typical - ensures reliable signal integrity in high-noise motor drives or power converter environments. |
| Max Data Rate | 25Mbps - supports isolated RS-485 at 20Mbps and UART up to 25Mbps without timing violation. |
| Supply Range | 1.71V–5.5V per side - enables direct interfacing with 1.8V microcontrollers and 3.3V/5V transceivers without level shifters. |
| Propagation Delay | 16.9–33.7ns - guarantees sub-35ns latency for real-time control loops requiring deterministic response. |
| Output Configuration | Bidirectional (IN1→OUT2, IN2→OUT1) - matches physical TX/RX line pairing in isolated half/full-duplex transceivers. |
Pinout & Package
MAX12931EASA+ uses an 8-pin narrow-body SOIC package (S8MS-22, outline 21-0041), with creepage/clearance ≥4mm and CTI >400 (IEC 60112 Group II). Package meets UL, cUL, and VDE safety standards for basic insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDDA | Side A power supply | Supplies logic domain A (e.g., MCU side); requires 0.1µF ceramic bypass to GNDA. |
| 2 - IN1 | Channel 1 input | Receives signal from Side A (e.g., MCU TX); drives OUT2 on Side B. |
| 3 - IN2 | Channel 2 input | Receives signal from Side A (e.g., MCU RX enable); drives OUT1 on Side B. |
| 4 - GNDA | Side A ground reference | Return path for VDDA and Side A logic; must be isolated from GNDB. |
| 5 - GNDB | Side B ground reference | Return path for VDDB and Side B logic; galvanically separated from GNDA. |
| 6 - OUT2 | Channel 2 output | Drives transceiver RX line on Side B; push-pull, no external pull-up needed. |
| 7 - OUT1 | Channel 1 output | Drives transceiver TX line on Side B; compatible with TTL/CMOS loads. |
| 8 - VDDB | Side B power supply | Supplies logic domain B (e.g., transceiver side); requires 0.1µF ceramic bypass to GNDB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional channel mapping | Hardwired IN1→OUT2 / IN2→OUT1 eliminates external routing complexity for UART isolation. |
| Low-power operation | 0.65mW/channel at 2Mbps/1.8V - reduces thermal load in space-constrained industrial modules. |
| Integrated refresh circuit | Maintains correct output state during indefinite DC input, preventing latch-up in static control signals. |
| Push-pull outputs | Eliminates need for external pull-up resistors, simplifying PCB layout and reducing BOM count. |
| Wide supply compatibility | 1.71V–5.5V on both sides enables direct interface with legacy 5V and modern 1.8V systems. |
Applications
| Industrial Fieldbus Isolation | Isolated RS-485 Transceiver |
|---|---|
Use Scenario: Protecting PLC controller UART lines from ground loops and surge transients in factory automation networks. IC Role / Device Role / Timing Role: Galvanic isolator bridging MCU (Side A) and RS-485 transceiver (Side B), with IN1→OUT2 carrying TX and IN2→OUT1 carrying RX. Use Value: Enables noise-free full-duplex communication at 25Mbps while meeting IEC 61000-4-5 ±10kV surge immunity. | Use Scenario: Isolating half-duplex RS-485 nodes in distributed energy monitoring systems with mixed-voltage sensors. IC Role / Device Role / Timing Role: Bidirectional signal coupler translating 3.3V MCU logic to 5V transceiver levels, maintaining <35ns propagation delay skew. Use Value: Eliminates ground potential differences that cause data corruption, supporting 1200m bus lengths at 250kbps. |
| Battery Management System (BMS) | Medical Isolated Data Acquisition |
Use Scenario: Isolating cell monitor IC SPI/UART outputs from main battery pack controller in EV traction packs. IC Role / Device Role / Timing Role: High-CMTI digital isolator separating high-side sensing domain (GNDA) from low-side control domain (GNDB). Use Value: Withstands 50kV/µs transients from IGBT switching, preserving data integrity during fault conditions. | Use Scenario: Isolating patient-connected ECG front-end ADC outputs from host processing unit in Class II medical devices. IC Role / Device Role / Timing Role: Safety-certified (UL/VDE Basic Insulation) barrier for analog-to-digital data transfer across patient-isolated boundary. Use Value: Meets 445VRMS working voltage requirement for 2×MOPP medical isolation while operating at 1.8V logic levels. |
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, 3.75kVRMS (16-pin SOIC), 150Mbps max, 2.5–5.5V supply only | Higher isolation rating but wider package; no 1.71V support | Select when >3kVRMS and >25Mbps are required, and board space allows 16-pin SOIC. |
| ADUM1201ARZ | 2-channel, bidirectional, 2.5kVRMS (8-pin SOIC), 1Mbps max, 3.0–5.5V supply only | Lower isolation, slower speed, narrower supply range | Select for cost-sensitive, low-speed industrial I/O where 3kVRMS is not mandated. |
Compared with SI8621ED-B-IS and ADUM1201ARZ, MAX12931EASA+ uniquely balances 3kVRMS certification, 25Mbps performance, 1.71V–5.5V dual-supply flexibility, and compact 8-pin narrow SOIC footprint - making it optimal for space-constrained, mixed-voltage, medium-speed isolation.
Availability
MAX12931EASA+ is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated RS-485 transceivers, and battery management systems requiring stable component supply, long-term lifecycle assurance, and certified safety isolation.
Supply support for MAX12931EASA+ 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 MAX12930/MAX12931 family was designed specifically for robust, low-power galvanic isolation in harsh electromagnetic environments - targeting industrial automation, energy infrastructure, and safety-critical medical subsystems.
FAQ
What is the isolation voltage rating of the MAX12931EASA+?
The MAX12931EASA+ is rated for 3kVRMS withstand voltage for 60 seconds (VISO) and 445VRMS maximum working voltage (VIOWM) in continuous operation. It is certified to UL1577, CSA Bulletin 5A, and VDE 0884-11 Basic Insulation (Group II) in its 8-pin narrow SOIC package. These ratings apply specifically to the MAX12931EASA+ variant and are validated per IEC 60747-5-5.
Does the MAX12931EASA+ support bidirectional signal flow?
Yes, the MAX12931EASA+ has fixed bidirectional channel mapping: IN1 drives OUT2, and IN2 drives OUT1. This architecture is purpose-built for full-duplex isolated interfaces like UART and RS-485 transceivers. Unlike unidirectional isolators (e.g., MAX12930), the MAX12931EASA+ does not allow same-direction channel pairing.
What supply voltage ranges does the MAX12931EASA+ support on each side?
The MAX12931EASA+ supports independent supply voltages from 1.71V to 5.5V on both sides: VDDA (Side A) and VDDB (Side B). This enables level translation between 1.8V microcontrollers and 3.3V or 5V transceivers without external level shifters. Undervoltage lockout activates below 1.5V on either supply.
Can the MAX12931EASA+ be used in medical applications?
Yes, the MAX12931EASA+ is suitable for medical applications requiring basic insulation, including patient-connected data acquisition systems. Its VDE 0884-11 certification, 445VRMS working voltage, and 4mm creepage/clearance meet key requirements for 2×MOPP isolation in Class II devices - provided system-level design complies with IEC 60601-1.
What is the maximum data rate supported by the MAX12931EASA+?
MAX12931EASA+ supports a maximum data rate of 25Mbps (B/E version). This is confirmed in the device's ordering suffix and datasheet Rev 10. It achieves this rate with guaranteed propagation delay skew ≤2ns (channel-to-channel, opposite direction) and peak jitter of 250ps at 25Mbps - sufficient for isolated RS-485 at 20Mbps and high-speed UART links.
MAX12931EASA+ 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:
- 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+ FAQ
1.How can I place an order for MAX12931EASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931EASA+ 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+ reliable?
The price and inventory of MAX12931EASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931EASA+ is usually 5 days.
3.What payment methods are accepted for MAX12931EASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931EASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931EASA+?
MAX12931EASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931EASA+ 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+?
For technical support, including MAX12931EASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931EASA+ requirements.
6.How does Aetrix verify that MAX12931EASA+ is sourced from the original manufacturer or authorized distributors?
All MAX12931EASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX12931EASA+?
All MAX12931EASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931EASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX12931EASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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