MAX3070EESD+T - 3.3V RS-485/RS-422 Transceiver | Analog Devices
部品番号: MAX3070EESD+T ✓ 生産中MAX3070EESD+T 概要
An RS-485/RS-422 transceiver is an interface IC that converts between digital logic signals and balanced differential bus signals. It belongs to the transceiver hierarchy within interface ICs, connecting UART, microcontrollers, and industrial controllers to long, noise-resistant differential buses. RS-422 emphasizes point-to-point, full-duplex communication, while RS-485 supports multidrop buses and half-duplex operation depending on how the driver enable is controlled.
The MAX3070E family combines a 250kbps-class RS-485/RS-422 interface with protective and operational features intended for industrial environments. ±15kV ESD protection improves tolerance of electrostatic discharge on bus-facing pins. Fail-safe receiver circuitry guarantees a logic-high receiver output when the receiver inputs are open or shorted, avoiding an indeterminate logic state on a disconnected bus. Hot-swap support allows the device to tolerate connection to a powered bus.
The transceiver uses separate driver and receiver paths for full-duplex communication. The MAX3070EESD+T operates from a 2.97V to 3.63V supply, making it appropriate for 3.3V systems where a 5V interface device would exceed the permitted supply range. Its one-driver, one-receiver arrangement maps naturally to four-wire RS-422 links and can also support half-duplex RS-485 designs when the bus implementation and enable control are configured accordingly.
Typical uses include industrial serial links, building automation, process-control equipment, instrumentation, POS terminals, and factory data-acquisition systems. The balanced differential bus reduces susceptibility to common-mode noise relative to single-ended communication, while fail-safe operation improves system behavior during cable faults or disconnected nodes.
Designers should preserve the transceiver’s specified supply voltage, termination, protection-network, and common-mode limits. Place the device close to the bus connector, provide a low-impedance ground reference, and follow the manufacturer’s pin-description table and recommended interface circuit. This page also organizes practical application guidance, comparison parameters, and sourcing information around the exact MAX3070EESD+T ordering code.
This page provides a concise engineering synthesis of the MAX3070EESD+T interface function, operating constraints, application fit, and design considerations. It translates the manufacturer’s product information into selection guidance for engineers evaluating a robust 3.3V differential bus transceiver.
ドロップイン代替品: MAX3070EESD+T — 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。
MAX3070EASD+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM3070EARZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3070EESD+T 仕様
| Product Type | RS-485/RS-422 transceiver |
| Supply Voltage Range | 2.97 V to 3.63 V |
| Nominal Supply Voltage | 3.3 V |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Communication Mode | Full duplex |
| Supported Standards | RS-422 and RS-485 |
| ESD Protection | ±15 kV |
| Receiver Fail-Safe Behavior | Logic-high output when receiver inputs are open or shorted |
| Hot-Swap Support | Yes |
| Maximum Data Rate | 250 kbps |
| パッケージ | 14-pin narrow SOIC |
| 実装タイプ | Surface mount |
| RoHS Compliance | Compliant |
| REACH Compliance | Unaffected |
| Moisture Sensitivity Level | MSL 1 (unlimited) |
MAX3070EESD+T 14-pin narrow soic ピン配置ガイド
MAX3070EESD+T (14-pin narrow soic パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: MAX3070EESD+T.
詳細は データシート をご参照ください。
主な用途
MAX3070EESD+T の用途: 6 件s: Industrial RS-485 Control Networks, Full-Duplex RS-422 Equipment Links, Process-Control and Instrumentation, Building Automation Gateways, Data Acquisition and Test Equipment, Point-of-Sale and Retail Terminals.
Industrial RS-485 Control Networks
The MAX3070EESD+T fits 3.3V industrial control nodes that exchange data over a differential RS-485 bus. Its 2.97V to 3.63V supply range matches 3.3V embedded systems, while ±15kV ESD protection adds protection at the bus-facing interface. The one-driver, one-receiver arrangement supports half-duplex multidrop arrangements when the transceiver enable is controlled appropriately. At a maximum signaling rate of 250kbps, it is suited to supervisory, configuration, and sensor-data links rather than very high-rate storage traffic.
おすすめ
Full-Duplex RS-422 Equipment Links
The MAX3070EESD+T is well suited to point-to-point, four-wire RS-422 links because it includes one transmitter and one receiver for independent send and receive paths. Its 3.3V operating range allows direct pairing with modern 3.3V UARTs and embedded controllers. Differential signaling improves noise immunity over cable runs, while fail-safe receiver behavior produces a defined logic-high state when receiver inputs are open or shorted. The interface should still use the termination arrangement and protection network specified for the selected bus topology.
おすすめ
Process-Control and Instrumentation
Use the MAX3070EESD+T when a 3.3V controller must connect to remote sensors, actuators, or laboratory instrumentation over a differential bus. The transceiver’s fail-safe receiver feature is valuable in field equipment because an open or shorted receiver input produces a defined high output instead of an indeterminate state. Hot-swap capability supports connection to an active bus, and ±15kV ESD protection strengthens the interface against electrostatic discharge encountered during installation and maintenance.
おすすめ
Building Automation Gateways
The MAX3070EESD+T can connect building-automation controllers to distributed field equipment over RS-485 or RS-422. A 3.3V supply range reduces compatibility issues with modern embedded controllers, while the differential interface supports communication over cables running near motors, relays, and switching equipment. Fail-safe operation helps maintain deterministic controller behavior during wiring disturbances. For long installations, combine the transceiver with appropriate bus protection, a low-impedance reference ground, and the termination specified by the system architecture.
おすすめ
Data Acquisition and Test Equipment
The MAX3070EESD+T supports distributed data-acquisition systems where remote measurement modules communicate with a central controller. Its 250kbps maximum rate is appropriate for sensor configuration, status reporting, and moderate command traffic. The receiver’s defined fail-safe output improves system interpretation of disconnected cables, and the narrow 14-pin SOIC package supports compact instrument designs. Bus protection and cable routing remain important because the transceiver handles ESD immunity but does not replace a properly engineered connector and surge-protection network.
おすすめ
Point-of-Sale and Retail Terminals
The MAX3070EESD+T can bridge a 3.3V retail controller to RS-485 or RS-422 peripherals such as scales, receipt printers, customer displays, or inventory readers. Hot-swap support is useful when service personnel connect or disconnect equipment, and fail-safe receiver behavior avoids ambiguous states on an interrupted link. The compact 14-pin package supports space-constrained terminal designs. The exact application still requires correct enable control, logic-level compatibility, and the appropriate termination for each cable segment.
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: MAX3070EESD+T — 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 | MAX3070EASD+T | ADM3070EARZ |
|---|---|---|---|
| Package | 14-pin narrow SOIC | 14-pin narrow SOIC - same | 14-pin narrow SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Product Type | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver |
主な差別化要因
- Defined receiver output during open or shorted input （vs ADM3070EARZ)
- Direct 3.3V system compatibility （vs MAX3070EASD+T)
- Industrial bus resilience in a compact package （vs MAX3070EASD+T)
設計ノート
Place the MAX3070EESD+T close to the system bus connector so bus-facing traces remain short and the protection network can connect directly to the interface pins. Keep the digital UART and enable traces away from the differential pair. Use a continuous ground reference beneath the interface area and follow the manufacturer’s recommended connector-side protection topology; ESD protection does not replace correct common-mode and surge design.
Configure the bus as the selected standard requires: four-wire RS-422 can use independent transmit and receive pairs, while half-duplex RS-485 shares the bus and requires controlled driver enable. Apply termination at the physical ends of the appropriate transmission line, not indiscriminately at every node. The fail-safe feature determines the receiver state for open or shorted inputs, but it does not eliminate the need for correct cabling and termination.
Do not treat the MAX3070E and MAX3079 family members as automatically interchangeable: device suffixes can indicate different supply, enable, or output configurations even when the packages match. Verify the exact ordering code against the manufacturer’s pin table, supply range, and timing requirements. Before substituting MAX3070EASD+T or ADM3070EARZ, confirm pin-level enable polarity, bus loading, receiver thresholds, and timing rather than relying on the SOIC-14 outline alone.
コンプライアンス情報
RoHS compliance and REACH unaffected status are stated in comparison data. Automotive qualification, lead-free status, halogen-free status, and conflict-minerals status are not established by the available manufacturer information.
