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Analog Devices Inc./Maxim Integrated MAX14942GWE+
- Part No.:
- MAX14942GWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX14942GWE+.pdf
- Description:
- DGTL ISO 5000VRMS RS485 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,059
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Product details
Overview
MAX14942GWE+ from Maxim Integrated is a 5kVRMS galvanically isolated, half-duplex RS-485/PROFIBUS-DP transceiver with integrated 5V LDO, ±35kV HBM ESD protection on A/B pins, 20Mbps data rate, and true fail-safe receiver. It enables robust industrial fieldbus communication across ground-potential differences in PLC backplanes and distributed I/O modules.
For engineers reviewing the MAX14942GWE+ datasheet, MAX14942GWE+ pinout, MAX14942GWE+ application, or MAX14942GWE+ equivalent, this page delivers verified isolation specs (5000VRMS/60s, VIOWM = 848VRMS), cable-side power architecture (VLDO input, VDDB output), thermal shutdown (+160°C), CMTI (35kV/μs), and PROFIBUS-compliant driver output swing (≥2.1V into 54Ω).
Technical Context
The MAX14942GWE+ implements capacitive galvanic isolation between UART-side (GNDA/VDDA) and cable-side (GNDB/VDDB), supporting bidirectional signal transfer without ground reference coupling. Its integrated LDO accepts 4.68V–14V at VLDO and regulates to 4.5–5.5V at VDDB with 300mA current limit and <1.7mV/mA load regulation.
It features a true fail-safe receiver with fixed -200mV to -50mV differential threshold, ensuring logic-high RXD during open/shorted bus conditions. Driver outputs include foldback current limiting (±15mA) and thermal shutdown, while receiver inputs present ¼-unit load (≥48kΩ) enabling up to 128 nodes on one bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000VRMS for 60s - meets basic insulation requirements per UL1577 and IEC 60747-5-5 |
| Data Rate | 20Mbps - supports high-speed PROFIBUS DP Class 3 and RS-485 fast-mode applications |
| ESD Protection | ±35kV HBM on A/B pins - eliminates need for external TVS diodes in most industrial environments |
| LDO Output | VDDB = 4.5–5.5V, 300mA max - powers termination resistors and external bus components directly |
| Receiver Input Load | ¼-unit load (≥48kΩ) - allows 128 transceivers on single RS-485 bus without repeaters |
| CMTI | 35kV/μs - maintains signal integrity under fast common-mode transients in motor drives and HV inverters |
| Operating Temp | -40°C to +105°C - qualified for extended industrial temperature range without derating |
Pinout & Package
MAX14942GWE+ uses a wide-body 16-pin SOIC package (package code: WSOIC) with 8mm creepage and clearance, rated for 5000VRMS isolation. Pin 1 is VDDA; pins 9 and 15 are GNDB; pin 11 is VLDO; pin 12 is A; pin 13 is B; pin 16 is VDDB. SBA (pin 7) is unique to MAX14942 and indicates side-B power status.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA (Pin 1) | UART-side supply input | 1.71–5.5V logic-side power; bypass with 0.1µF + 1µF near pin |
| GNDA (Pins 2,8) | UART-side ground reference | Reference for TXD, RXD, DE, RE, PV; must be isolated from GNDB |
| RXD (Pin 3) | Receiver data output | Logic-level UART output; high-impedance when RE = high |
| RE (Pin 4) | Receiver enable | Pull-down internal 4.5µA; low = enable RXD, high = tri-state |
| DE (Pin 5) | Driver enable | Pull-down internal 4.5µA; high = drive A/B, low = high-Z |
| TXD (Pin 6) | Driver input | Pull-up internal 4.5µA to VDDA; controls A/B polarity |
| SBA (Pin 7) | Side-B active indicator | Open-drain output pulled up to VDDA via 5kΩ; low = VDDB powered and stable |
| GNDB (Pins 9,15) | Cable-side ground | Reference for A, B, VDDB, VLDO, DEM; must be isolated from GNDA |
| VLDO (Pin 11) | LDO input | 4.68–14V input to internal regulator; leave unconnected to disable LDO |
| A (Pin 12) | Noninverting bus terminal | RS-485/PROFIBUS differential output/input; ±35kV HBM protected |
| B (Pin 13) | Inverting bus terminal | RS-485/PROFIBUS differential output/input; ±35kV HBM protected |
| VDDB (Pin 16) | Cable-side supply output | LDO output (4.5–5.5V) or external cable-side supply input |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5V LDO | Eliminates external regulator; powers VDDB and up to 10mA of external termination loads |
| True fail-safe receiver | Guarantees logic-high RXD during open/shorted bus or idle-terminated line, reducing system-level polling overhead |
| ±35kV HBM ESD on A/B | Meets IEC 61000-4-2 Level 4 without external protection, lowering BOM cost and PCB area |
| Undervoltage lockout | VUVLOA = 1.58V (VDDA), VUVLOB = 2.7V (VDDB) - prevents metastable operation during power ramp-up |
| Thermal shutdown | Triggers at +160°C junction temp; recovers at +145°C - protects against sustained bus contention or overload |
Applications
| PLC Backplane Communication | Distributed I/O Modules |
|---|---|
Use Scenario: Isolated serial link between CPU rack and remote I/O expansion racks in harsh factory environments with ground potential differences >100V. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver providing galvanic isolation barrier and 20Mbps data throughput between controller and field devices. Use Value: Enables reliable multi-drop communication without ground-loop-induced errors or noise coupling; 5000VRMS isolation withstands lightning-induced surges. | Use Scenario: PROFIBUS-DP node in modular sensor/actuator interface units deployed in HVAC control panels and energy metering gateways. IC Role / Device Role / Timing Role: Cable-side isolated transceiver with integrated LDO powering local bus termination and auxiliary circuitry. Use Value: Reduces component count by integrating LDO and eliminating external ESD protection; ¼-unit load supports dense node deployment (128 per segment). |
| Motor Drive Fieldbus Interface | Industrial Power Metering |
Use Scenario: RS-485 interface between variable frequency drive (VFD) and central SCADA system in high-noise electrical substations. IC Role / Device Role / Timing Role: Isolated transceiver handling fast transient events (CMTI = 35kV/μs) and ±10kV surge per IEC 61000-4-5. Use Value: Maintains data integrity during switching transients from nearby IGBTs; thermal shutdown prevents latch-up during bus faults. | Use Scenario: Two-way communication interface in DIN-rail mounted smart electricity meters communicating over long RS-485 trunk lines in utility substations. IC Role / Device Role / Timing Role: Robust half-duplex transceiver with fail-safe receiver ensuring valid idle state during line disconnection or sensor failure. Use Value: Prevents false readings or watchdog timeouts due to floating bus; ±35kV ESD tolerance ensures reliability during field servicing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM2483BRWZ | 3.75kVRMS isolation (1s), no integrated LDO, 16Mbps max data rate, 1/8-unit load receiver | Requires external 5V supply for cable side; lower node density (256 nodes) but slower speed | Select when lower isolation rating suffices and external LDO already exists in design |
| ISO1540DR | 2.5kVRMS isolation (1s), no LDO, 1Mbps max, 1/4-unit load, I²C interface instead of UART | Not RS-485 compatible; intended for isolated I²C bus extension, not fieldbus | Reject for RS-485/PROFIBUS use; only consider for low-speed isolated control signaling |
Compared with ADM2483BRWZ and ISO1540DR, MAX14942GWE+ delivers higher isolation (5kVRMS), integrated LDO simplifying power architecture, and full 20Mbps PROFIBUS-DP support - making it optimal for new industrial automation designs requiring compact, high-reliability fieldbus interfaces.
Availability
MAX14942GWE+ is available at Aetrix Electronics and suitable for industrial automation equipment, programmable logic controllers, and HVAC control systems requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for MAX14942GWE+ 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 ICs for industrial, automotive, and communications markets.
The MAX14942GWE+ belongs to Maxim's isolated interface product line, engineered specifically for robust, high-speed fieldbus communication in electrically noisy industrial environments where ground isolation and ESD resilience are critical.
FAQ
What is the maximum isolation voltage rating for MAX14942GWE+?
The MAX14942GWE+ is rated for 5000VRMS isolation voltage for 60 seconds per UL1577 and IEC 60747-5-5 standards. It also supports 848VRMS maximum working isolation voltage (VIOWM) and 1200VPEAK repetitive peak isolation voltage (VIORM), making it suitable for reinforced insulation in industrial safety-critical applications.
Does MAX14942GWE+ include an integrated voltage regulator?
Yes, MAX14942GWE+ integrates a low-dropout regulator (LDO) that accepts 4.68V–14V at VLDO (Pin 11) and delivers a regulated 4.5–5.5V output at VDDB (Pin 16) with up to 300mA current capability. This eliminates the need for an external cable-side power supply in many PROFIBUS and RS-485 node designs.
How does the true fail-safe feature of MAX14942GWE+ improve system reliability?
The true fail-safe circuitry in MAX14942GWE+ guarantees a logic-high RXD output when A/B inputs are open, shorted, or connected to a terminated bus with all drivers disabled. This prevents undefined states during cable disconnects or node failures, eliminating spurious interrupts and improving deterministic behavior in PLC and DCS systems.
What is the receiver input impedance of MAX14942GWE+ and why does it matter?
MAX14942GWE+ has a ¼-unit load receiver input impedance (≥48kΩ), allowing up to 128 transceivers on a single RS-485 bus segment. This enables high-density node deployment in distributed I/O systems without repeaters or additional buffering, reducing system cost and complexity compared to standard 1-unit-load transceivers.
Can MAX14942GWE+ be used in PROFIBUS-DP networks?
Yes, MAX14942GWE+ is explicitly designed for PROFIBUS-DP applications. It meets PROFIBUS physical layer requirements including differential output voltage ≥2.1V into 54Ω, common-mode range -7V to +12V, and 20Mbps data rate - and is referenced in Maxim's application circuits for PROFIBUS A/B line termination with 220Ω/390Ω networks.
MAX14942GWE+ 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:
- RS485
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/µs (Typ)
- Data Rate:
- 20Mbps
- Propagation Delay tpLH / tpHL (Max):
- 68ns, 68ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 15ns, 15ns (Max)
- Voltage - Supply:
- 1.71V ~ 5.5V, 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX14942GWE+ FAQ
1.How can I place an order for MAX14942GWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14942GWE+ 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 MAX14942GWE+ reliable?
The price and inventory of MAX14942GWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14942GWE+ is usually 5 days.
3.What payment methods are accepted for MAX14942GWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14942GWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14942GWE+?
MAX14942GWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14942GWE+ 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 MAX14942GWE+?
For technical support, including MAX14942GWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14942GWE+ requirements.
6.How does Aetrix verify that MAX14942GWE+ is sourced from the original manufacturer or authorized distributors?
All MAX14942GWE+ 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 MAX14942GWE+ meets industry standards.
7.What is the process for return or replacement of MAX14942GWE+?
All MAX14942GWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14942GWE+, 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 MAX14942GWE+ part is unused and in its original packaging.
Return procedure for MAX14942GWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14942GWE+ Tags
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