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Analog Devices Inc./Maxim Integrated MAX14941GWE+
- Part No.:
- MAX14941GWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX14941GWE+.pdf
- Description:
- DGTL ISO 5000VRMS RS485 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,257
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Product details
Overview
MAX14941GWE+ from Maxim Integrated is a 5kVRMS galvanically isolated, half-duplex RS-485/PROFIBUS-DP transceiver with integrated 5V LDO, ±35kV HBM ESD protection on cable-side pins (A/B), and 20Mbps data rate. It features true fail-safe receiver logic, undervoltage lockout on both sides, and thermal shutdown - deployed in industrial PLCs and HVAC systems requiring robust noise immunity across ground-potential differences.
For engineers reviewing the MAX14941GWE+ datasheet, MAX14941GWE+ pinout, MAX14941GWE+ application, or MAX14941GWE+ equivalent, key selection criteria include isolation voltage rating (5000VRMS/60s), cable-side power architecture (integrated LDO with VLDO input), bus loading capability (¼-unit load, up to 128 nodes), and PROFIBUS-DP compliance under IEC 61158.
Technical Context
The MAX14941GWE+ implements capacitive galvanic isolation between UART-side (GNDA/VDDA) and cable-side (GNDB/VDDB), enabling signal integrity in high-noise industrial environments with ground potential differences exceeding several volts. Its driver supports 2.1V min differential output into 54Ω load and maintains 20Mbps operation with <6ns skew and <68ns propagation delay.
True fail-safe logic ensures RXD = high when A/B are open, shorted, or connected to a terminated but idle bus - achieved via fixed receiver threshold (-200mV to -50mV) and internal hysteresis (15mV). The integrated LDO accepts 4.68V–14V at VLDO and delivers regulated 4.5V–5.5V at VDDB with 300mA current limit and <1.7mV/mA load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000VRMS for 60s - meets basic insulation requirements per UL1577 and IEC 60747-5-5 |
| Max Data Rate | 20Mbps - supports high-speed PROFIBUS-DP Class 3 (12Mbps+) and RS-485 fast-mode applications |
| Receiver Input Load | ¼-unit load (≥48kΩ) - enables up to 128 transceivers on a single bus segment |
| ESD Protection (A/B) | ±35kV HBM - eliminates need for external TVS diodes on bus lines in most industrial layouts |
| LDO Output | 5V ±0.5V at up to 120mA - powers termination resistors and optional bus-side peripherals without external regulator |
| Common-Mode Transient Immunity | 35kV/μs - prevents data corruption during fast ground transients in motor drives or power converters |
| Operating Temperature | -40°C to +105°C - qualified for extended use in uncooled control cabinets and outdoor metering enclosures |
Pinout & Package
MAX14941GWE+ is housed in a wide-body 16-pin SOIC package (7.5mm body width, 10.3mm length) with 8mm creepage and clearance, rated for reinforced insulation per IEC 60747-5-5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA (Pin 1) | UART-side supply input | 1.71V–5.5V logic-side power; bypass with 0.1µF + 1µF near pin to suppress switching noise |
| GNDA (Pins 2,8) | UART-side ground reference | Reference for TXD, RXD, DE, RE, PV; must be isolated from GNDB by ≥8mm |
| RXD (Pin 3) | Receiver data output | CMOS-level output enabled by RE low; high-impedance when RE = high or VDDA < 1.58V |
| RE (Pin 4) | Receiver enable input | Pull-down biased (4.5µA); drives RXD high-impedance when high; failsafe-high when disabled |
| DE (Pin 5) | Driver enable input | Pull-down biased (4.5µA); enables A/B outputs when high; disables to high-Z when low or UVLO active |
| TXD (Pin 6) | Driver input | Pull-up biased (4.5µA to VDDA); controls A/B polarity; compatible with 1.8V/3.3V/5V logic |
| PV (Pin 7) | Power valid input | Hold low during power-up sequencing; high enables driver after VDDA/VDDB stabilize above UVLO thresholds |
| GNDB (Pins 9,15) | Cable-side ground reference | Reference for A, B, VDDB, VLDO, DEM; must be isolated from GNDA by ≥8mm |
| VLDO (Pin 11) | LDO input supply | Accepts 4.68V–14V; enables internal LDO; leave unconnected or tie to GNDB to disable LDO |
| A (Pin 12) | Noninverting bus terminal | RS-485/PROFIBUS differential output/input; ±35kV HBM ESD protected to GNDB |
| B (Pin 13) | Inverting bus terminal | RS-485/PROFIBUS differential output/input; ±35kV HBM ESD protected to GNDB |
| VDDB (Pin 16) | Cable-side supply output/input | 5V LDO output (when VLDO powered) or direct cable-side supply input (when VLDO disabled) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5V LDO | Eliminates external regulator for cable-side power; supports 120mA load with <180mV dropout at 120mA |
| True Fail-Safe Receiver | Guarantees RXD = high for open/shorted A-B or terminated idle bus - no external bias resistors required |
| Undervoltage Lockout | Independent thresholds: VDDA UVLO = 1.58V ±75mV, VDDB UVLO = 2.7V ±150mV - prevents metastable operation during brownout |
| Thermal Shutdown | Activates at TJ ≥ +160°C; auto-recovery at TJ ≤ +145°C - protects against sustained bus contention or overload |
| PROFIBUS-DP Compliance | Meets IEC 61158-2 electrical specs: 2.1V min VOD into dual 220Ω terminations with 390Ω pull-ups |
Applications
| PLC Backplane Communication | Smart Power Meter Interface |
|---|---|
Use Scenario: Isolated RS-485 link between CPU module and I/O expansion racks in modular PLC chassis with varying ground potentials across slots. IC Role / Device Role / Timing Role: Half-duplex transceiver providing galvanic isolation and 20Mbps data exchange between UART and PROFIBUS-DP fieldbus. Use Value: Breaks ground loops across rack boundaries, prevents noise coupling from motor drives, and supports >128 node addressing via ¼-unit load receiver. | Use Scenario: Bidirectional communication between metrology IC and concentrator in ANSI C12.19-compliant smart electricity meters deployed in substations. IC Role / Device Role / Timing Role: Isolated RS-485 PHY layer interface handling time-critical firmware updates and real-time energy data polling. Use Value: ±35kV HBM ESD rating withstands handling in field service; 5000VRMS isolation meets IEC 61000-4-5 surge immunity requirements for Class III installations. |
| HVAC Building Controller Network | Industrial Motion Control Hub |
Use Scenario: Distributed temperature/pressure sensor network in large commercial HVAC systems using daisy-chained RS-485 wiring across multiple floors. IC Role / Device Role / Timing Role: Robust physical layer transceiver enabling reliable command-response protocol over 1200m bus runs with mixed node types. Use Value: 35kV/μs CMTI rejects noise from variable-frequency drives; integrated LDO powers remote termination resistors without extra DC/DC converter. | Use Scenario: Centralized motion controller communicating with servo drives and I/O modules in packaging machinery with high EMI from switching inverters. IC Role / Device Role / Timing Role: PROFIBUS-DP compliant transceiver ensuring deterministic cycle times (<1ms) in closed-loop position control networks. Use Value: 20Mbps data rate supports high-resolution encoder feedback; thermal shutdown prevents latch-up during emergency stop events causing bus contention. |
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 | 2.5kVRMS isolation (vs. 5kVRMS), no integrated LDO, 16Mbps max data rate | Suitable for lower-isolation industrial networks where external 5V rail exists on cable side | Select when board space allows separate LDO and isolation rating ≥2.5kVRMS suffices for end-equipment safety certification |
| ISO1500DWR | 5kVRMS isolation, no LDO, 1Mbps max data rate, lower ESD (±16kV HBM) | Targeted at cost-sensitive, low-speed building automation where 20Mbps not required | Select when legacy 1Mbps PROFIBUS PA or Modbus RTU is used and PCB layout constraints favor SOIC-8 footprint |
Compared with ADM2483BRWZ and ISO1500DWR, MAX14941GWE+ delivers higher isolation margin, integrated power, and double the data rate - making it optimal for next-generation high-speed, self-powered PROFIBUS-DP nodes where layout simplicity and noise immunity are critical.
Availability
MAX14941GWE+ is available at Aetrix Electronics and suitable for industrial automation equipment, programmable logic controllers, and HVAC systems requiring stable component supply across long product lifecycles and rigorous environmental qualification.
Supply support for MAX14941GWE+ 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 power management ICs for industrial, automotive, and communications markets.
The MAX14941GWE+ belongs to Maxim's isolated interface product line, engineered specifically for high-reliability industrial fieldbus applications demanding galvanic separation, high ESD tolerance, and integrated power architecture.
FAQ
What is the maximum cable-side supply voltage supported by MAX14941GWE+ when using the internal LDO?
The MAX14941GWE+ internal LDO accepts VLDO input from 4.68V to 14V relative to GNDB. When powered, it regulates VDDB to 4.5V–5.5V. Exceeding 14V at VLDO risks overstressing the LDO input stage; operation above 12V requires verification of power dissipation limits per thermal characteristics in the datasheet. The MAX14941GWE+ must not be operated with VLDO >14V.
Does MAX14941GWE+ support full-duplex RS-485 communication?
No, MAX14941GWE+ is a half-duplex transceiver only - it provides one shared differential bus pair (A/B) for bidirectional communication and lacks independent transmit/receive differential channels. Full-duplex operation requires separate A/B and Y/Z pairs, which this device does not implement. For full-duplex isolated RS-485, consider the MAX14937 or similar quad-channel isolators.
How does the true fail-safe feature of MAX14941GWE+ behave during bus contention or open-circuit conditions?
The MAX14941GWE+ true fail-safe circuitry guarantees RXD = high whenever (VA – VB) ≤ –200mV or ≥ –50mV - covering open circuits, shorts, and terminated idle buses. This eliminates external biasing and ensures predictable logic state during fault conditions. The MAX14941GWE+ achieves this via fixed receiver thresholds and internal hysteresis, independent of external components.
Can MAX14941GWE+ be used in PROFIBUS-DP networks without external termination resistors?
No - MAX14941GWE+ does not integrate termination resistors. PROFIBUS-DP requires 220Ω termination at each bus end. The MAX14941GWE+'s integrated LDO can power external 220Ω terminations (drawing ~23mA each), but the resistors themselves must be placed externally on the PCB near the A/B connectors per IEC 61158-2.
What is the purpose of the PV (Power Valid) pin on MAX14941GWE+ and how should it be configured?
The PV pin on MAX14941GWE+ enables controlled driver activation after power supplies stabilize. Hold PV low during power-up; drive PV high only after VDDA and VDDB exceed their respective UVLO thresholds (1.58V and 2.7V). Leaving PV unconnected defaults to internal pull-up, but explicit control prevents spurious transmission during rail ramp-up. The MAX14941GWE+ driver remains disabled until PV = high and both supplies are valid.
MAX14941GWE+ 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
MAX14941GWE+ FAQ
1.How can I place an order for MAX14941GWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14941GWE+ 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 MAX14941GWE+ reliable?
The price and inventory of MAX14941GWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14941GWE+ is usually 5 days.
3.What payment methods are accepted for MAX14941GWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14941GWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14941GWE+?
MAX14941GWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14941GWE+ 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 MAX14941GWE+?
For technical support, including MAX14941GWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14941GWE+ requirements.
6.How does Aetrix verify that MAX14941GWE+ is sourced from the original manufacturer or authorized distributors?
All MAX14941GWE+ 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 MAX14941GWE+ meets industry standards.
7.What is the process for return or replacement of MAX14941GWE+?
All MAX14941GWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14941GWE+, 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 MAX14941GWE+ part is unused and in its original packaging.
Return procedure for MAX14941GWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX14941GWE+ Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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