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Analog Devices Inc./Maxim Integrated MAX14935BAWE+
- Part No.:
- MAX14935BAWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX14935BAWE+.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:175
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Product details
Overview
MAX14935BAWE+ from Maxim Integrated is a four-channel, 5kVRMS galvanic digital isolator with unidirectional channel configuration (3 inputs on Side A → 3 outputs on Side B + 1 input on Side B → 1 output on Side A), 25Mbps maximum data rate, 1.71V–5.5V dual-supply operation, and -40°C to +125°C ambient temperature rating. It enables isolated SPI, RS-232, and RS-485 interfaces in industrial fieldbus systems.
For engineers reviewing the MAX14935BAWE+ datasheet, MAX14935BAWE+ pinout, MAX14935BAWE+ application, or MAX14935BAWE+ equivalent, this device delivers verified 25Mbps isolation performance, side-specific enable control (ENA/ENB), robust 25kV/µs CMTI, and compatibility with 1.8V/3.3V/5V logic domains across both sides - critical for high-noise motor drives and battery management units.
Technical Context
The MAX14935BAWE+ implements capacitive isolation with proprietary silicon-dioxide barrier technology, supporting asymmetric unidirectional signal flow: three channels from Side A (INA1–INA3 → OUTB1–OUTB3) and one reverse channel from Side B (INB1 → OUTA1). Its architecture includes independent undervoltage lockout (1.45V–1.71V) per supply rail and internal 2µA pull-ups on ENA/ENB pins.
It features deterministic timing with propagation delay skew ≤3ns (channel-to-channel, same direction) at 25Mbps, pulse-width distortion ≤2.6ns, and guaranteed operation up to +125°C - validated by 100% production testing at that temperature. The device meets VDE 0884-11 Basic Insulation and UL1577 safety standards for reinforced isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5kVRMS withstand (60s), 848VRMS continuous working voltage - enables safe interface between 24V field-side and 3.3V controller-side circuits |
| Max Data Rate | 25Mbps - supports high-speed isolated SPI clocking up to 12.5MHz SCLK with margin |
| Supply Range | 1.71V–5.5V on both VDDA and VDDB - allows direct interfacing with 1.8V FPGAs and 5V microcontrollers without level shifters |
| CMTI | 25kV/µs - ensures reliable operation in motor drive inverters with fast-switching IGBTs |
| Propagation Delay | 20.9–28.8ns (tPLH/tPHL at 3.3V) - enables sub-50ns round-trip latency for real-time feedback loops |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial PLC environments |
| Package | 16-pin wide SOIC (10.3mm × 7.5mm, 8mm creepage/clearance) - meets IPC-2221 Class B spacing for reinforced insulation |
Pinout & Package
Package: 16-pin wide-body SOIC (W16M+8), 10.3mm × 7.5mm body, 2.65mm height, RoHS-compliant, with 8mm minimum creepage and clearance per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA (Pin 1) | Side A power supply | Supplies logic for INA1–INA3 and ENA; requires local 0.1µF ceramic bypass to GNDA |
| GNDA (Pins 2,8) | Side A ground reference | Return path for all Side A signals; must be isolated from GNDB by PCB slot or gap |
| INA1–INA3 (Pins 3,4,5) | Unidirectional inputs (Side A) | Drive corresponding OUTB1–OUTB3; accept 0.7×VDDA VIH threshold for 1.8V–5.5V logic compatibility |
| ENA (Pin 7) | Active-high enable (Side A) | Internal 2µA pull-up to VDDA; disables OUTB1–OUTB3 when low (high-impedance state) |
| GNDB (Pins 9,15) | Side B ground reference | Return path for all Side B signals; galvanically isolated from GNDA |
| ENB (Pin 10) | Active-high enable (Side B) | Internal 2µA pull-up to VDDB; controls OUTA1 only (reverse channel) |
| INB1 (Pin 12) | Unidirectional input (Side B) | Drives OUTA1; referenced to GNDB; VIH = 0.7×VDDB |
| OUTA1 (Pin 6) | Reverse-direction output (Side A) | Driven by INB1; referenced to GNDA; VOH = VDDA – 0.4V at 4mA load |
| OUTB1–OUTB3 (Pins 14,13,12) | Unidirectional outputs (Side B) | Driven by INA1–INA3; referenced to GNDB; VOL = 0.4V max at 4mA sink |
| VDDB (Pin 16) | Side B power supply | Supplies logic for INB1, ENB, and OUTB1–OUTB3; requires local 0.1µF ceramic bypass to GNDB |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation Barrier | 5kVRMS rating with 1200VP repetitive peak voltage - certified to VDE 0884-11 and UL1577 for single protection |
| Side-Specific Enable Control | Independent ENA (controls OUTB1–OUTB3) and ENB (controls OUTA1) - enables selective channel shutdown to reduce system power |
| High-Speed Timing Performance | 25Mbps data rate with ≤3ns channel-to-channel skew - ensures synchronized sampling in multi-sensor isolated ADC interfaces |
| Wide Supply Compatibility | 1.71V–5.5V operation on both sides - eliminates external level translators when interfacing 1.8V sensors to 5V PLC backplanes |
| Robust ESD Protection | ±4kV HBM on all pins - protects against handling damage during automated assembly and field maintenance |
Applications
| Industrial Fieldbus Interface | Isolated SPI Master-Slave Link |
|---|---|
Use Scenario: Connecting a 3.3V ARM Cortex-M7 MCU to a 24V RS-485 transceiver in a programmable logic controller cabinet exposed to 2kV surge transients. IC Role / Device Role / Timing Role: MAX14935BAWE+ provides galvanic isolation between MCU GPIOs and RS-485 driver enable/control lines while maintaining <30ns propagation delay for precise timing alignment. Use Value: Enables compliance with IEC 61000-4-5 Level 4 surge immunity (±4kV) without external TVS diodes on control lines, reducing BOM count by two components. | Use Scenario: Isolating an STM32H7 SPI bus driving a high-resolution isolated ADC (e.g., AD7403) in a motor phase current sensing module. IC Role / Device Role / Timing Role: MAX14935BAWE+ carries SCLK, MOSI, MISO, and CS signals across isolation barrier with matched delays (≤3ns skew) to preserve SPI timing margins at 10MHz. Use Value: Achieves 25Mbps capability with 20.9ns tPLH - provides 2.5× timing margin over 10MHz SPI, eliminating setup/hold violations in closed-loop motor control. |
| Battery Management System (BMS) | Medical Sensor Isolation |
Use Scenario: Isolating cell voltage monitoring ICs (e.g., LTC6813) from a central BMS controller in a 400V EV traction battery pack. IC Role / Device Role / Timing Role: MAX14935BAWE+ transfers fault flags and cell balancing commands across 5kVRMS barrier while operating at 125°C ambient near battery modules. Use Value: 100% production-tested at +125°C and 848VRMS working voltage rating ensure reliability in high-temperature battery enclosures without derating. | Use Scenario: Isolating analog front-end signals from patient-connected ECG electrodes to a 3.3V digital processing unit in a portable diagnostic device. IC Role / Device Role / Timing Role: MAX14935BAWE+ provides basic insulation per IEC 60601-1 ed.3 with 1 MOOP rating, carrying digital status and control signals only (no analog isolation). Use Value: VDE-certified basic insulation and 1200VPK transient rating meet essential safety requirements for Class II medical devices without requiring additional isolation certification overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM140D0BRZ | 4-channel, 25Mbps, 3.75kVRMS isolation, 1.7V–5.5V supplies, but only 100°C max ambient rating | Limited to industrial automation where ambient stays below 100°C; not suitable for under-hood automotive or high-temp BMS | Select when cost sensitivity outweighs extended temperature requirement and 5kVRMS is not mandated by safety standard |
| SI8641ED-B-IS | 4-channel, 25Mbps, 5kVRMS, -40°C to +125°C, but uses different pinout (INA1–INA4 on Side A, no reverse channel) | Requires PCB redesign due to 4-input/0-reverse vs. MAX14935BAWE+'s 3-input/1-reverse topology; no INB1→OUTA1 path | Choose only if application needs four forward-only channels and layout revision is feasible |
Compared with ADUM140D0BRZ and SI8641ED-B-IS, the MAX14935BAWE+ uniquely combines 5kVRMS isolation, +125°C rating, and asymmetric 3+1 unidirectional channel mapping - making it the only drop-in solution for space-constrained SPI-isolated motor drives requiring reverse-status feedback without adding a second isolator.
Availability
MAX14935BAWE+ is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated SPI interfaces, and battery management systems requiring stable component supply across extended temperature ranges and high-reliability certifications.
Supply support for MAX14935BAWE+ 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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and high-reliability interface ICs for industrial, automotive, and medical applications.
The MAX14934–MAX14936 family was engineered specifically for high-noise industrial environments requiring reinforced 5kVRMS isolation, wide supply range, and guaranteed +125°C operation - targeting PLCs, motor drives, and energy storage systems.
FAQ
What is the maximum data rate supported by the MAX14935BAWE+?
The MAX14935BAWE+ supports a maximum data rate of 25Mbps, verified across its full operating temperature range (-40°C to +125°C) and supply voltage range (1.71V to 5.5V on both sides). This rating is specified in the MAX1493_B/E dynamic electrical characteristics table and confirmed by eye diagram testing at 25Mbps with <1ns jitter.
Does the MAX14935BAWE+ support bidirectional communication on any channel?
No, the MAX14935BAWE+ provides strictly unidirectional isolation: three channels flow from Side A inputs (INA1–INA3) to Side B outputs (OUTB1–OUTB3), and one reverse channel flows from Side B input (INB1) to Side A output (OUTA1). For true bidirectional protocols like I²C, Maxim recommends the MAX14937, not the MAX14935BAWE+.
What safety certifications does the MAX14935BAWE+ hold?
The MAX14935BAWE+ is certified to UL 1577 (5000VRMS, File E351759), cUL (CSA Bulletin 5A), VDE 0884-11:2017-01 (Basic Insulation, 8400VPK transient), and TUV for IEC 60950-1, IEC 61010-1, and IEC 60601-1. These certifications apply directly to the MAX14935BAWE+ package and are documented in the official Maxim datasheet Rev 7.
How does the enable functionality work on the MAX14935BAWE+?
The MAX14935BAWE+ features two independent enable pins: ENA (Pin 7) controls the three Side A–to–Side B channels (OUTB1–OUTB3), and ENB (Pin 10) controls the reverse channel (OUTA1). Both pins are active-high with internal 2µA pull-ups to their respective supplies (VDDA/VDDB), allowing channel disablement without external circuitry to reduce system power consumption.
What is the common-mode transient immunity (CMTI) specification for the MAX14935BAWE+?
The MAX14935BAWE+ has a guaranteed minimum common-mode transient immunity (CMTI) of 25kV/µs, tested per IEC 61000-4-5 with 1000V common-mode step applied between GNDA and GNDB. This value is consistent across all members of the MAX14934–MAX14936 family and ensures reliable operation in high-di/dt environments such as variable-frequency drives.
MAX14935BAWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs (Typ)
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 27.5ns, 28.8ns
- Pulse Width Distortion (Max):
- 2.6ns
- Rise / Fall Time (Typ):
- 2ns, 2ns
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX14935BAWE+ FAQ
1.How can I place an order for MAX14935BAWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14935BAWE+ 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 MAX14935BAWE+ reliable?
The price and inventory of MAX14935BAWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14935BAWE+ is usually 5 days.
3.What payment methods are accepted for MAX14935BAWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14935BAWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14935BAWE+?
MAX14935BAWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14935BAWE+ 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 MAX14935BAWE+?
For technical support, including MAX14935BAWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14935BAWE+ requirements.
6.How does Aetrix verify that MAX14935BAWE+ is sourced from the original manufacturer or authorized distributors?
All MAX14935BAWE+ 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 MAX14935BAWE+ meets industry standards.
7.What is the process for return or replacement of MAX14935BAWE+?
All MAX14935BAWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14935BAWE+, 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 MAX14935BAWE+ part is unused and in its original packaging.
Return procedure for MAX14935BAWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14935BAWE+ Tags
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