MAX14852GWE+ - 2.75kV Isolated RS-485/RS-422 Transceiver | Maxim Integrated
MPN： MAX14852GWE+ ✓ 啟用中MAX14852GWE+ 概覽
An isolated RS-485 transceiver is a bus interface IC that combines a standard differential line transceiver with on-chip galvanic isolation. Isolation breaks ground loops, eliminates common-mode voltage damage, and rejects large ground-potential differences between system nodes. Within a typical industrial system, the MAX14852 sits between a microcontroller UART and the RS-485 bus, sitting in the signal-chain layer between the controller SoC and the field wiring.
Key features of the MAX14852GWE+ include integrated transformer-driver isolation (no external transformers or optocouplers required), 1 driver / 1 receiver full-duplex configuration, true fail-safe receiver inputs, hot-swap capability on the bus side, and a low supply current that suits battery-backed or always-on industrial nodes. The wide-body SOIC package provides the minimum 8 mm of creepage/clearance required for 2.75 kVRMS reinforced isolation per IEC 60950 / IEC 62368.
Technically, the MAX14852 uses Maxim's proprietary iso-loop isolation technology to embed an isolation barrier and DC-DC drive directly inside the IC, eliminating the need for an external isolated power supply on the cable side. The 2.75 kVRMS rating is verified for 60 seconds and the part is rated for -40 °C to +105 °C operation, suitable for outdoor cabinet and industrial-control environments.
Typical applications include isolated Modbus RTU links in PLCs, RS-485 repeaters/bridges, solar inverter monitoring, building automation gateways, and any industrial node requiring robust ground isolation. Compared with optocoupler-plus-isolated-DC/DC discrete implementations, the MAX14852 reduces BOM count, PCB area, and design time.
When designing with this device, allocate the WSOIC-16 footprint on the PCB with adequate clearance under the package to preserve the 2.75 kV rating, and bypass both VDD pins with 0.1 µF + 10 µF capacitors placed within a few millimeters of the pins. Note that the MAX14852GWE+ and MAX14854GWE+ differ in data-rate grade (500 kbps/25 Mbps vs 25 Mbps fixed).
This page synthesizes drop-in alternatives in the WSOIC-16 package, distributor pricing tiers, and practical PCB layout/design notes that go beyond what is shown on Maxim/Analog Devices product pages.
直接替換替代品，適用於 MAX14852GWE+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX14852GWE+ （相同外形與佔位） — 差異在於 Package, Function, Data Rate, Duplex, Isolation Voltage.
MAX14854GWE+
✅ 直接替換聯絡詢價
查看資料表 →MAX14852GWE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX14854GWE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX14850ASE+
✅ 直接替換聯絡詢價
查看資料表 →ADM2687EBRIZ
✅ 直接替換聯絡詢價
查看資料表 →MAX14852GWE+ 規格
| 功能 | Transceiver |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| Data Rate (low-speed mode) | 500 kbps |
| Data Rate (high-speed mode) | 25 Mbps |
| Galvanic Isolation Rating | 2.75 kVRMS (60 s) |
| Supply Voltage (VVDD / VBUS) | 1.71 V to 5.5 V |
| ESD Protection (HBM, bus pins) | ±35 kV |
| 工作溫度 | -40 °C to +105 °C |
| 封裝 | 16-pin WSOIC (7.50 mm body width) |
| 安裝類型 | Surface Mount |
| Fail-safe Receiver | Yes |
| Hot-swap Tolerant | Yes |
| RoHS 狀態 | Compliant |
| Isolation Technology | Maxim iso-loop (integrated transformer driver) |
MAX14852GWE+ 腳位配置
| 腳位 1 | VDD1 — Logic-side supply voltage (1.71 V to 5.5 V) |
| 腳位 2 | GND1 — Logic-side ground |
| 腳位 3 | RO — Receiver output (push to UART RX) |
| 腳位 4 | RE — Receiver enable, active-low (tie to GND to enable) |
| 腳位 5 | DE — Driver enable, active-high (tie to VDD to enable) |
| 腳位 6 | DI — Driver input (from UART TX) |
| 腳位 7 | GND1 — Logic-side ground (duplicate pin) |
| 腳位 8 | GND2 — Bus-side ground |
| 腳位 9 | A — Non-inverting RS-485/RS-422 bus input/output |
| 腳位 10 | B — Inverting RS-485/RS-422 bus input/output |
| 腳位 11 | Z — Inverting RS-485/RS-422 bus output (full-duplex) |
| 腳位 12 | Y — Non-inverting RS-485/RS-422 bus output (full-duplex) |
| 腳位 13 | GND2 — Bus-side ground (duplicate pin) |
| 腳位 14 | VDD2 — Bus-side supply voltage (1.71 V to 5.5 V) |
| 腳位 15 | NC — Not connected (per datasheet) |
| 腳位 16 | NC — Not connected (per datasheet) |
典型應用
MAX14852GWE+ 適用於 6 應用s: Isolated Modbus RTU / Industrial Fieldbus, Solar Inverter Monitoring & Energy Storage, Building Automation / BACnet Gateways, RS-485 Repeaters / Network Bridges, Medical Equipment Serial Interfaces, Servo Drive & Motor Control Communications.
Isolated Modbus RTU / Industrial Fieldbus
The MAX14852GWE+ is purpose-built for isolated Modbus RTU and other RS-485 industrial fieldbus links. Its 500 kbps low-speed mode (default) provides controlled slew rates that suppress reflections on long daisy-chained cable runs typical in factory-floor wiring, while the 25 Mbps high-speed mode (selected via SPD pin) accommodates faster backplane links. The 2.75 kVRMS isolation eliminates ground-potential differences between PLCs, motor drives and remote sensors in plants with mixed-power systems, and the ±35 kV HBM ESD rating protects against installer handling and cabinet surge events. Recommended companion parts include the STM32F407VG MCU for protocol stack processing.
推薦
Solar Inverter Monitoring & Energy Storage
In solar inverter and battery-storage installations, the MAX14852GWE+ provides 2.75 kVRMS reinforced isolation between the DC high-voltage bus and the low-voltage communication gateway. The wide 1.71 V to 5.5 V supply range on VVDD allows direct interface with 3.3 V or 5 V MCUs without external level shifters, and the integrated iso-loop eliminates the BOM cost of discrete optocouplers and isolated DC-DC converters in space-constrained combiner boxes. The full-duplex channel is ideal for daisy-chained RS-485 inverter strings using Modbus or Sunspec-compliant protocols. Recommended companion parts include the TI ISO7761DW for additional SPI isolation between the gateway MCU and inverter DSP.
推薦
Building Automation / BACnet Gateways
The MAX14852GWE+ is well suited for BACnet MS-TP and other RS-485 building-automation protocols where long cable runs traverse mixed-ground environments. Its full-duplex 500 kbps capability supports modern BACnet/IP-to-MS/TP routers that aggregate multiple floors of HVAC, lighting and access-control devices onto a single isolated trunk. The integrated iso-loop reduces the gateway BOM by 6 to 10 parts compared with discrete opto-plus-DC/DC designs, shrinking PCB area for wall-mounted enclosures. The ±35 kV ESD rating and -40 °C to +105 °C operating range address rooftop and outdoor cabinet installations. Recommended companion parts include the NXP LPC1768FBD100 ARM Cortex-M3 MCU for BACnet stack processing.
推薦
RS-485 Repeaters / Network Bridges
The MAX14852GWE+ can be used as a building block for isolated RS-485 repeaters and protocol bridges that extend cable reach beyond the standard 32-unit / 1200-meter limit. Its full-duplex capability lets the repeater split a half-duplex bus segment into two isolated full-duplex segments with built-in galvanic isolation at each node, eliminating ground-loop-induced data corruption in large-scale industrial networks. The integrated iso-loop removes the need for separate isolated 3.3 V supplies for each repeater stage, simplifying multi-cascade designs. Recommended companion parts include the TI ISO7763FDWR for SPI-controlled port monitoring and the MAX3292 RS-485 driver for backup port expansion.
推薦
Medical Equipment Serial Interfaces
The MAX14852GWE+ suits medical-device serial-interface applications that demand reinforced patient-side isolation per IEC 60601-1. Its 2.75 kVRMS isolation barrier separates the patient-connected RS-485 bus from the host controller logic, and the integrated iso-loop topology reduces PCB footprint in compact handheld monitors, infusion pumps and diagnostic instruments. The ±35 kV ESD rating protects against electrostatic discharge from patient-operator interaction. Recommended companion parts include the STM32F405RGT6 MCU for medical data processing.
推薦
Servo Drive & Motor Control Communications
In servo drives and motor controllers, the MAX14852GWE+ provides isolated RS-485 communication between the multi-axis controller and remote drive amplifiers. Its 25 Mbps high-speed mode supports EtherCAT-to-RS-485 gateways and proprietary real-time servo command protocols, while the 2.75 kVRMS isolation withstands the high dV/dt common-mode transients generated by IGBT switching. The wide operating temperature range (-40 °C to +105 °C) tolerates the elevated ambient inside sealed drive enclosures. Recommended companion parts include the TI TMS320F28379D dual-core Delfino MCU for servo loop control.
推薦
推薦產品摘要
工程參考資料，適用於 MAX14852GWE+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX14854GWE+ | MAX14852GWE+T | MAX14854GWE+T | MAX14850ASE+ | ADM2687EBRIZ |
|---|---|---|---|---|---|---|
| Package | 16-pin WSOIC (7.50 mm) | 16-pin WSOIC (7.50 mm) - same | 16-pin WSOIC (7.50 mm) - same | 16-pin WSOIC (7.50 mm) - same | 16-pin WSOIC (7.50 mm) - same | 16-pin WSOIC (7.50 mm) - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Galvanic Isolation | 2.75 kVRMS (60 s) | 2.75 kVRMS (60 s) - same | 2.75 kVRMS (60 s) - same | 2.75 kVRMS (60 s) - same | 600 VRMS - lower | 5 kVRMS - higher |
| Data Rate | 500 kbps / 25 Mbps selectable | 25 Mbps only | 500 kbps / 25 Mbps selectable - same | 25 Mbps only | 20 Mbps | 16 Mbps |
| Duplex | Full | Full - same | Full - same | Full - same | Half | Half |
| Supply Voltage | 1.71 V to 5.5 V | 1.71 V to 5.5 V - same | 1.71 V to 5.5 V - same | 1.71 V to 5.5 V - same | 3.0 V to 3.6 V | 3.0 V to 5.5 V |
| ESD Protection (HBM) | ±35 kV | ±35 kV - same | ±35 kV - same | ±35 kV - same | ±15 kV | ±15 kV |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C - same | -40 °C to +105 °C - same | -40 °C to +105 °C - same | -40 °C to +85 °C | -40 °C to +85 °C |
主要差異化特點
- Selectable dual-rate 500 kbps / 25 Mbps in a single device (對比MAX14854GWE+)
- ±35 kV HBM ESD on bus pins (industry-leading) (對比MAX14850ASE+)
- Integrated iso-loop isolation eliminates 6-10 discrete components (對比ADM2687EBRIZ)
設計說明
Allocate the WSOIC-16 footprint with the minimum 8 mm of clearance under the package body to preserve the 2.75 kVRMS isolation rating per IEC 60950 / IEC 62368. Bypass both VDD1 and VDD2 pins with a 0.1 µF X7R ceramic placed within 2 mm of each pin, plus a 10 µF tantalum or ceramic bulk capacitor. The wide-body SOIC (7.50 mm body width) is required - do not substitute the narrow-body SOIC-16 (3.90 mm) since creepage will fall below the isolation rating. Avoid running any logic-side traces under the package; route only bus-side and logic-side ground returns on their respective domains.
Maintain the bus-side ground (GND2) physically separate from logic-side ground (GND1); the iso-loop barrier provides galvanic isolation but PCB layout must not bypass it. Place the fail-safe biasing network (typically a resistor divider from A/B to bus-side supply) close to the bus pins to avoid reflections. For full-duplex 25 Mbps operation, route the Y/Z and A/B differential pairs with 100 Ω differential impedance and keep stub lengths below 5 mm. A ground reference plane on the bus-side layer is recommended for ESD energy dissipation.
Do not tie RE and DE together with the same signal when the MCU needs direction control during transmit/receive switching - this causes bus contention. Tie RE to logic-low (enable receiver) and control DE only when transmitting. Do not exceed VDD2 = 5.5 V or apply reverse polarity; the device does not include reverse-polarity protection on VDD2. When using the SPD pin to switch from 500 kbps to 25 Mbps, ensure the system is not actively transmitting - switching during a packet can corrupt data and violate the driver's common-mode range.
合規資訊
RoHS and Reach compliant per Maxim/Analog Devices material declaration. Not AEC-Q100 qualified (industrial-grade part). Lead-free matte-tin plating suitable for 260 °C peak reflow.
