MAX14852GWE+ - 2.75kV Isolated RS-485/RS-422 Transceiver | Maxim Integrated
部品番号: MAX14852GWE+ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $11.3 | $11.30 |
| 10 | $10.17 | $101.70 |
| 100 | $9.04 | $904.00 |
| 500 | $8.1 | $4,050.00 |
| 1,000 | $7.25 | $7,250.00 |
MAX14852GWE+ 概要
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.
ドロップイン代替品: MAX14852GWE+ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX14852GWE+ （同一形状・フットプリント） — 相違点: Package, Function, Data Rate, Duplex, Isolation Voltage.
クイック比較ツール — 並列比較する代替部品を選択:
MAX14854GWE+
✅ ドロップイン✓ 在庫あり
価格はお問い合わせください
データシートを見る →MAX14852GWE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX14854GWE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX14850ASE+
✅ ドロップイン✓ 在庫あり
$2.41 / 個
データシートを見る →ADM2687EBRIZ
✅ ドロップイン✓ 在庫あり
$8.5 / 個
データシートを見る →MAX14852GWE+ 仕様
| 機能 | 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 |
| 動作温度 | -40 °C to +105 °C |
| パッケージ | 16-pin WSOIC (7.50 mm body width) |
| 実装タイプ | Surface Mount |
| Fail-safe Receiver | Yes |
| Hot-swap Tolerant | Yes |
| RoHS ステータス | Compliant |
| Isolation Technology | Maxim iso-loop (integrated transformer driver) |
MAX14852GWE+ ピン構成
| ピン 1 | VDD1 — Logic-side supply voltage (1.71 V to 5.5 V) |
| ピン 2 | GND1 — Logic-side ground |
| ピン 3 | RO — Receiver output (push to UART RX) |
| ピン 4 | RE — Receiver enable, active-low (tie to GND to enable) |
| ピン 5 | DE — Driver enable, active-high (tie to VDD to enable) |
| ピン 6 | DI — Driver input (from UART TX) |
| ピン 7 | GND1 — Logic-side ground (duplicate pin) |
| ピン 8 | GND2 — Bus-side ground |
| ピン 9 | A — Non-inverting RS-485/RS-422 bus input/output |
| ピン 10 | B — Inverting RS-485/RS-422 bus input/output |
| ピン 11 | Z — Inverting RS-485/RS-422 bus output (full-duplex) |
| ピン 12 | Y — Non-inverting RS-485/RS-422 bus output (full-duplex) |
| ピン 13 | GND2 — Bus-side ground (duplicate pin) |
| ピン 14 | VDD2 — Bus-side supply voltage (1.71 V to 5.5 V) |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
MAX14852GWE+ の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX14852GWE+ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Selectable dual-rate 500 kbps / 25 Mbps in a single device （vs MAX14854GWE+)
- ±35 kV HBM ESD on bus pins (industry-leading) （vs MAX14850ASE+)
- Integrated iso-loop isolation eliminates 6-10 discrete components （vs ADM2687EBRIZ)
設計ノート
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.
コンプライアンス情報
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.
