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Analog Devices Inc./Maxim Integrated MAX14431CAEE+
- Part No.:
- MAX14431CAEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX14431CAEE+.pdf
- Description:
- 4-CHANNEL, LOW POWER, 5KV DIGITA
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
The MAX14431CAEE+ from Analog Devices is a 4-channel, unidirectional, high-speed digital galvanic isolator in a 16-pin QSOP package with 3kVRMS isolation rating (60s), 200Mbps data rate, and default-low output configuration. It operates across independent 1.71V–5.5V supplies on both sides and delivers 50kV/μs common-mode transient immunity for robust noise rejection in industrial fieldbus and isolated RS-485 interfaces.
For engineers reviewing the MAX14431CAEE+ datasheet, MAX14431CAEE+ pinout, MAX14431CAEE+ application, or MAX14431CAEE+ equivalent, this device supports fast, low-power signal transfer between isolated domains with precise timing control, fail-safe default behavior, and level-shifting capability-critical for SPI isolation, battery management systems, and medical equipment requiring certified safety margins.
Technical Context
The MAX14431CAEE+ implements Maxim's proprietary silicon-dioxide isolation barrier with integrated CMOS logic on both sides, enabling bidirectional supply independence and fail-safe operation upon input loss. Its architecture supports active-low enable inputs per side and guarantees deterministic propagation delay skew ≤2ns (channel-to-channel, same direction) and ≤10.2ns (opposite direction) at 1.8V.
It features dual-voltage domain operation (VDDA/GNDA and VDDB/GNDB), input hysteresis of 80mV (MAX1443_C/F variant), and failsafe delay of 50µs-ensuring predictable output state during power-up, brownout, or open-circuit conditions without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (QSOP package); enables single-protection isolation per IEC 60747-5-5 in space-constrained designs |
| Max Data Rate | 200Mbps; supports high-speed serial protocols like isolated SPI and RS-422 without timing bottlenecks |
| CMTI | 50kV/μs typical; rejects fast transients in motor drives and industrial PLCs without output corruption |
| Supply Range | 1.71V to 5.5V per side; allows direct interfacing with 1.8V microcontrollers and 5V legacy peripherals |
| Fail-Safe Delay | 50µs; ensures safe output transition to default-low state within defined window after input/power loss |
| Propagation Skew | ≤2ns (same-direction channels); maintains timing integrity across multi-bit parallel isolation paths |
| Operating Temp | −40°C to +125°C; qualified for under-hood automotive, industrial control, and medical environments |
Pinout & Package
Package: 16-pin QSOP (E16MS+1F), 4mm creepage/clearance, CTI >400 (Group II), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Side A power supply | Supplies logic and isolation circuitry on input side; accepts 1.71V–5.5V |
| GNDA | Side A ground reference | Reference for all Side A inputs/outputs; galvanically isolated from GNDB |
| IN1–IN4 | Digital input signals (Side A) | CMOS-compatible inputs with 80mV hysteresis; default-low output variant |
| ENA | Side A output enable (active-low) | Tri-states all four Side A outputs when asserted; supports dynamic channel gating |
| VDDB | Side B power supply | Independent supply for output-side logic; enables level translation |
| GNDB | Side B ground reference | Reference for Side B outputs; isolated from GNDA by SiO₂ barrier |
| OUT1–OUT4 | Digital outputs (Side B) | Default-low outputs; drive 4mA sink / −4mA source into 15pF load |
| ENB | Side B output enable (active-low) | Tri-states all four Side B outputs; enables bidirectional enable control |
Key Features
| Feature | Design Value |
|---|---|
| 200Mbps data rate | Enables real-time isolation of high-speed serial buses without protocol overhead or retiming |
| 50kV/μs CMTI | Prevents data corruption in noisy environments such as variable-frequency drives and factory automation |
| Fail-safe default-low | Guarantees known output state during power loss or floating inputs-no external pull resistors needed |
| 1.71V–5.5V dual-supply support | Eliminates level-shifters when connecting 1.8V SoCs to 3.3V/5V fieldbus transceivers |
| QSOP package (4mm creepage) | Meets reinforced insulation requirements in compact PCB layouts while maintaining UL/cUL certification |
Applications
| Isolated SPI Interface | Fieldbus Communications |
|---|---|
Use Scenario: Isolating SPI clock, MOSI, MISO, and CS lines between MCU and isolated ADC or DAC in industrial sensor nodes. IC Role / Device Role / Timing Role: Four-channel unidirectional isolator with matched propagation delays preserving SPI timing margins at up to 200MHz SCLK. Use Value: Enables full-duplex SPI isolation without added latency skew or external timing compensation circuits. | Use Scenario: Signal isolation in PROFIBUS-DP or Modbus RTU nodes where RS-485 transceivers require galvanic separation from controller logic. IC Role / Device Role / Timing Role: Provides independent isolation for TX, RX, DE, and RE control lines with 50kV/μs CMTI to survive EFT bursts on factory floors. Use Value: Eliminates ground loops and prevents bus faults from propagating to host MCU, improving system uptime. |
| Isolated RS-485/RS-422 | Battery Management Systems |
Use Scenario: Isolating differential line drivers/receivers in electric vehicle charging stations or solar inverters with ±15kV ESD protection. IC Role / Device Role / Timing Role: Translates logic-level signals across isolation barrier while maintaining RS-485 timing integrity and fail-safe defaults. Use Value: Supports hot-plug compatibility and prevents latch-up during transceiver power sequencing mismatches. | Use Scenario: Isolating cell monitor IC communication (e.g., LTC6813) from main BMS MCU in 400V+ traction battery packs. IC Role / Device Role / Timing Role: Transfers voltage/current sampling data and fault alerts across 3kVRMS barrier with <2ns inter-channel skew for synchronized sampling. Use Value: Meets IEC 61000-4-5 surge immunity requirements while enabling accurate multi-cell voltage correlation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641ED-IS | 4-channel, 200Mbps, 3.75kVRMS (SOIC), default-high output | Requires board-level inversion for default-low logic; higher isolation rating but larger SOIC footprint | Select when 3.75kVRMS and SOIC packaging are mandatory; verify output polarity compatibility |
| ADUM4401BRWZ | 4-channel, 25Mbps, 5kVRMS (SOIC), default-high, no fail-safe delay spec | Lower speed limits use in high-throughput BMS or SPI; lacks documented fail-safe timing guarantee | Choose for cost-sensitive, lower-speed applications where 5kVRMS is required and default-high is acceptable |
Compared with SI8641ED-IS and ADUM4401BRWZ, the MAX14431CAEE+ uniquely combines 200Mbps speed, QSOP compactness, 3kVRMS QSOP certification, and guaranteed 50µs fail-safe delay-making it optimal for space-constrained, high-speed, safety-critical isolation where deterministic default behavior is essential.
Availability
MAX14431CAEE+ is available at Aetrix Electronics and suitable for industrial automation, battery management systems, and medical instrumentation requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for MAX14431CAEE+ 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 MAX14430–MAX14432 family was designed specifically for high-speed, low-power galvanic isolation in harsh electromagnetic environments-targeting fieldbus, motor control, and energy infrastructure applications demanding reliability and safety certification.
FAQ
What is the isolation voltage rating for the MAX14431CAEE+?
The MAX14431CAEE+ has a 3kVRMS withstand isolation voltage rating for 60 seconds in its QSOP package, certified to UL1577 and CSA Bulletin 5A standards. It also supports 445VRMS maximum working isolation voltage (VIOWM) and 7.5kV surge immunity (1.2/50μs waveform), making it suitable for reinforced insulation in industrial and medical applications.
Does the MAX14431CAEE+ support different supply voltages on each side?
Yes, the MAX14431CAEE+ supports independent 1.71V to 5.5V supplies on Side A (VDDA/GNDA) and Side B (VDDB/GNDB). This enables seamless level translation-for example, interfacing a 1.8V FPGA I/O bank with a 3.3V RS-485 transceiver-without external level shifters or voltage regulators.
What does "default-low" mean for the MAX14431CAEE+ outputs?
"Default-low" means that when any input (IN1–IN4) is unpowered, open-circuited, or held at invalid logic levels, the corresponding OUT1–OUT4 pins actively drive low. This behavior is guaranteed by internal circuitry and eliminates the need for external pull-down resistors in fail-safe system designs.
How does the MAX14431CAEE+ handle common-mode transients?
The MAX14431CAEE+ achieves 50kV/μs typical common-mode transient immunity (CMTI), measured per IEC 60747-5-5. This ensures reliable output logic states even during rapid ground potential shifts-such as those caused by IGBT switching in motor drives-without glitches or metastability.
Is the MAX14431CAEE+ pin-compatible with other devices in the MAX14430–MAX14432 family?
Yes, all MAX14430–MAX14432 variants-including MAX14431CAEE+-share identical 16-pin QSOP pinouts and footprint. Differences lie only in data rate (25Mbps vs. 200Mbps), output default state (high/low), and channel direction configuration (all unidirectional in this variant), allowing drop-in replacement within the same package option.
MAX14431CAEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs (Typ)
- Data Rate:
- 200Mbps
- 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:
- 16-QSOP
MAX14431CAEE+ FAQ
1.How can I place an order for MAX14431CAEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14431CAEE+ 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 MAX14431CAEE+ reliable?
The price and inventory of MAX14431CAEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14431CAEE+ is usually 5 days.
3.What payment methods are accepted for MAX14431CAEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14431CAEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14431CAEE+?
MAX14431CAEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14431CAEE+ 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 MAX14431CAEE+?
For technical support, including MAX14431CAEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14431CAEE+ requirements.
6.How does Aetrix verify that MAX14431CAEE+ is sourced from the original manufacturer or authorized distributors?
All MAX14431CAEE+ 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 MAX14431CAEE+ meets industry standards.
7.What is the process for return or replacement of MAX14431CAEE+?
All MAX14431CAEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14431CAEE+, 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 MAX14431CAEE+ part is unused and in its original packaging.
Return procedure for MAX14431CAEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14431CAEE+ Tags
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