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Analog Devices Inc./Maxim Integrated MAX12931FASA+
- Part No.:
- MAX12931FASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX12931FASA+.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,823
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Product details
Overview
MAX12931FASA+ from Analog Devices is a two-channel, low-power digital galvanic isolator with 3kVRMS isolation rating in an 8-pin narrow-body SOIC package. It features opposite-direction channel configuration (IN1→OUT2, IN2→OUT1), supports 1.71V–5.5V dual supplies per side, delivers 25Mbps data rate (B/E version), and consumes only 0.65mW per channel at 2Mbps with 1.8V supply - ideal for isolated UART transceiver interfaces in industrial fieldbus systems.
For engineers reviewing the MAX12931FASA+ datasheet, MAX12931FASA+ pinout, MAX12931FASA+ application, or MAX12931FASA+ equivalent, key selection criteria include channel directionality (bidirectional signal flow), 3kVRMS isolation compliance (UL1577, VDE 0884-11 Basic Insulation), CTI ≥400 Group II creepage rating, and compatibility with 1.8V/3.3V/5V logic level translation across isolated domains.
Technical Context
The MAX12931FASA+ implements capacitive-based galvanic isolation using Maxim's proprietary process, enabling robust signal transfer across isolated power domains without magnetic coupling. Its two unidirectional channels operate in opposite directions - IN1 drives OUT2 on Side B, and IN2 drives OUT1 on Side A - forming a full-duplex isolation path essential for RS-485/RS-232 transceivers.
It integrates independent undervoltage-lockout (UVLO) circuitry on both VDDA and VDDB rails (threshold: 1.5–1.66V), ensuring reliable startup and fault-safe output behavior during supply sag. The device maintains high common-mode transient immunity (CMTI = 50kV/µs typ) and supports operation from –40°C to +125°C ambient, with propagation delay skew ≤2ns between opposing channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3kVRMS for 60s - meets UL1577 and VDE 0884-11 Basic Insulation requirements for reinforced isolation in industrial environments. |
| Max Data Rate | 25Mbps - sufficient for isolated RS-485 (up to 20Mbps), CAN FD (up to 5Mbps), and industrial UART applications. |
| Supply Voltage Range | 1.71V to 5.5V per side - enables direct interfacing with 1.8V microcontrollers and 3.3V/5V peripherals without external level shifters. |
| Power Consumption | 0.65mW per channel at 2Mbps/1.8V - reduces thermal load and extends battery life in portable isolated sensors or BMS modules. |
| CMTI | 50kV/µs typical - suppresses false triggering in noisy motor drive or power converter environments with fast ground transients. |
| Propagation Delay Skew (Opposite Channels) | ≤2ns - ensures tight timing alignment between TX and RX paths in full-duplex isolated communication links. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, factory automation, and energy metering deployments. |
Pinout & Package
MAX12931FASA+ uses an 8-pin narrow-body SOIC package (S8MS-22, outline 21-0041) with CTI ≥400 (Group II creepage). Pin 1 is VDDA; pins 2 and 4 are GNDA; pin 3 is IN1; pin 5 is GNDB; pin 6 is OUT2; pin 7 is IN2; pin 8 is VDDB; and OUT1 is on pin 7 for MAX12931 (per functional diagram and pin description).
| 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 output. |
| 2 (GNDA) | Side A ground reference | Return path for VDDA, IN1, IN2, and OUT1; must be isolated from GNDB. |
| 3 (IN1) | Channel 1 input | Drives OUT2 on Side B; accepts 1.71V–5.5V logic levels; VIH = 0.7×VDDA (min). |
| 4 (GNDA) | Side A ground reference | Second GNDA connection for improved grounding; electrically tied to pin 2. |
| 5 (GNDB) | Side B ground reference | Return path for VDDB, OUT1, OUT2, and IN2; must be isolated from GNDA. |
| 6 (OUT2) | Channel 2 output | Driven by IN1 on Side A; push-pull CMOS/TTL-compatible; VOH ≥ VDDA – 0.4V. |
| 7 (IN2) | Channel 2 input | Drives OUT1 on Side A; complements IN1 to enable bidirectional data flow across isolation barrier. |
| 8 (VDDB) | Side B power supply | Bypass with 0.1µF ceramic capacitor to GNDB; sets logic-high level for OUT1/OUT2 outputs and IN2 input. |
Key Features
| Feature | Design Value |
|---|---|
| Opposite-direction channel architecture | Enables native full-duplex isolation for UART/RS-485 transceivers without external routing or cross-coupling. |
| Independent dual-supply operation | VDDA and VDDB each support 1.71V–5.5V, allowing seamless level translation between 1.8V MCU and 5V peripheral domains. |
| High CMTI (50kV/µs) | Prevents data corruption in high-noise environments such as motor drives, inverters, and PLC backplanes. |
| Low-power refresh circuit | Maintains correct output state during indefinite DC input conditions - critical for safety-critical watchdog or status monitoring signals. |
| Integrated UVLO with hysteresis | Ensures predictable output behavior during brown-out events; 45mV hysteresis prevents oscillation near threshold. |
Applications
| Industrial Fieldbus Isolation | Isolated RS-485 Transceiver Interface |
|---|---|
Use Scenario: Isolating Modbus RTU nodes in factory automation networks exposed to ground loops and EMI. IC Role / Device Role / Timing Role: Bidirectional digital isolator providing galvanic separation between controller UART and RS-485 PHY, with matched TX/RX timing. Use Value: Eliminates ground-loop-induced communication errors and withstands ±10kV surge per IEC 61000-4-5. | Use Scenario: Protecting host MCU UART lines when interfacing with isolated RS-485 transceivers in harsh electrical environments. IC Role / Device Role / Timing Role: Full-duplex isolator mapping MCU TX→transceiver RX and MCU RX←transceiver TX with sub-2ns skew. Use Value: Enables plug-and-play integration with standard RS-485 transceivers while maintaining 25Mbps throughput and 3kVRMS safety rating. |
| Battery Management System (BMS) Communication | Medical Isolated Data Acquisition |
Use Scenario: Isolating cell-monitoring IC UART outputs from main BMS controller in EV traction battery packs. IC Role / Device Role / Timing Role: Low-power, high-reliability isolator transferring SOC/SOH telemetry across 400V+ potential differences. Use Value: Consumes <1mW per channel at 1Mbps, minimizing self-heating in sealed battery enclosures. | Use Scenario: Isolating patient-connected sensor front-ends from diagnostic processing units in ECG or EEG equipment. IC Role / Device Role / Timing Role: Safety-certified isolator meeting IEC 60601-1 creepage/clearance requirements (4mm min) and VDE basic insulation. Use Value: Provides 3kVRMS withstand voltage and >10¹²Ω insulation resistance for patient safety compliance. |
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, 25Mbps, 3.75kVRMS (SOIC-8), 1.7–5.5V supplies, CMTI = 35kV/µs | Higher isolation rating but lower CMTI; RoHS-compliant but lacks VDE 0884-11 certification | Select when higher isolation margin is prioritized over EMI immunity in less noisy environments. |
| ISO6721DR | 2-channel, 25Mbps, 3kVRMS (SOIC-8), 1.71–5.5V supplies, CMTI = 25kV/µs, no default-output option | Lower CMTI and no configurable default state; TI's ISO6721 has different UVLO thresholds (1.4V) | Choose for cost-sensitive designs where CMTI >30kV/µs is not required and default-state control is unnecessary. |
Compared with SI8621ED-B-IS and ISO6721DR, MAX12931FASA+ provides superior noise immunity (50kV/µs vs. ≤35kV/µs), VDE 0884-11 certification for medical/industrial safety, and programmable default output states - making it optimal for high-integrity full-duplex isolation where timing integrity and regulatory compliance are critical.
Availability
MAX12931FASA+ is available at Aetrix Electronics and suitable for industrial fieldbus nodes, isolated RS-485 transceiver interfaces, and battery management system communications requiring stable component supply, long-term lifecycle assurance, and certified safety isolation.
Supply support for MAX12931FASA+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX12931FASA+ belongs to Analog Devices' MAX12930/MAX12931 family of low-power, high-CMTI digital isolators designed specifically for full-duplex isolated communication in space-constrained, thermally sensitive, and safety-critical applications.
FAQ
What is the isolation voltage rating of the MAX12931FASA+?
The MAX12931FASA+ is rated for 3kVRMS isolation voltage for 60 seconds per UL1577 and VDE 0884-11 Basic Insulation standards. Its maximum working isolation voltage (VIOWM) is 445VRMS, and it withstands ±10kV surge per IEC 61000-4-5 (1.2/50µs waveform). This rating applies specifically to the 8-pin narrow-body SOIC package used in MAX12931FASA+.
Does the MAX12931FASA+ support bidirectional communication natively?
Yes, the MAX12931FASA+ implements native bidirectional communication through its opposite-direction channel architecture: IN1 on Side A drives OUT2 on Side B, and IN2 on Side A drives OUT1 on Side B. This eliminates the need for external signal routing or additional logic, enabling direct integration with full-duplex transceivers like RS-485 or UART interfaces without added latency or skew.
What are the supply voltage requirements for MAX12931FASA+?
The MAX12931FASA+ requires two independent supplies: VDDA (1.71V to 5.5V, referenced to GNDA) and VDDB (1.71V to 5.5V, referenced to GNDB). Each supply powers one side of the isolation barrier and defines the logic voltage levels for inputs and outputs on that side. Both supplies must be bypassed with 0.1µF ceramic capacitors to their respective grounds.
How does the MAX12931FASA+ handle undervoltage conditions?
The MAX12931FASA+ incorporates independent undervoltage-lockout (UVLO) circuits on both VDDA and VDDB rails, with a threshold of 1.5V–1.66V and 45mV hysteresis. When either supply drops below UVLO, the corresponding side's outputs enter a known default state (high or low, depending on part variant), preventing undefined logic states during power-up, brown-out, or fault conditions - a critical feature for system reliability.
Can MAX12931FASA+ be used for level translation between different logic families?
Yes, MAX12931FASA+ supports level translation across its isolation barrier: VDDA can be set to 1.8V (for low-power MCU I/O) while VDDB is set to 3.3V or 5V (for legacy peripherals), with compatible input thresholds (VIH = 0.7×VDD_) and push-pull outputs (VOH ≥ VDD_ – 0.4V, VOL ≤ 0.4V). This eliminates external level shifters in mixed-voltage isolated systems.
MAX12931FASA+ 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
- 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
MAX12931FASA+ FAQ
1.How can I place an order for MAX12931FASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX12931FASA+ 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 MAX12931FASA+ reliable?
The price and inventory of MAX12931FASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX12931FASA+ is usually 5 days.
3.What payment methods are accepted for MAX12931FASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX12931FASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX12931FASA+?
MAX12931FASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX12931FASA+ 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 MAX12931FASA+?
For technical support, including MAX12931FASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX12931FASA+ requirements.
6.How does Aetrix verify that MAX12931FASA+ is sourced from the original manufacturer or authorized distributors?
All MAX12931FASA+ 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 MAX12931FASA+ meets industry standards.
7.What is the process for return or replacement of MAX12931FASA+?
All MAX12931FASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX12931FASA+, 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 MAX12931FASA+ part is unused and in its original packaging.
Return procedure for MAX12931FASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX12931FASA+ 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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