MAX3485ESA+ - 10Mbps RS-485/RS-422 Transceiver | Analog Devices
MPN： MAX3485ESA+ ✓ 啟用中MAX3485ESA+ 概覽
An RS-485/RS-422 transceiver is a physical-layer interface IC that converts logic-level digital signals into differential bus signals and receives differential bus signals back into CMOS-compatible logic. RS-485 supports multipoint, half-duplex communication, while RS-422 is commonly used for point-to-point, full-duplex links. The MAX3485 family combines a driver and receiver in one package to reduce board area and simplify interface implementation.
The MAX3485ESA+ is identified as a 3.3 V-powered, slew-rate-limited, true RS-485/RS-422 transceiver. The verified product information specifies a 10 Mbps data rate and an 8-SOIC package. The slew-rate-limited driver is intended to reduce unwanted signal transitions and improve communication behavior on practical differential buses. Each device contains one driver and one receiver.
The interface family is suitable for industrial control, instrumentation, data acquisition, building automation, and embedded communications where differential signaling helps reject common-mode noise. The MAX3485ESA+ can also support point-to-point RS-422 links, depending on the system wiring and termination arrangement. Its low-power 3.3 V operation is useful for compact equipment where supply current and bus-energy efficiency matter.
When designing a circuit, verify the exact pin functions, supply-voltage limits, driver enable logic, receiver output behavior, and termination requirements from the manufacturer datasheet before layout. RS-485 buses generally need correct biasing and termination at the physical endpoints; RS-422 links require termination appropriate to the selected topology. Never infer an alternate package or pinout from a distributor title alone.
This page consolidates the verified manufacturer product information, distributor listings, packaging data, and design-oriented guidance for engineers evaluating the MAX3485ESA+. It also distinguishes the part from functional alternatives that may require different packages, logic functions, or interface architectures.
直接替換替代品，適用於 MAX3485ESA+ — 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： MAX3485ESA+ （相同外形與佔位） — 差異在於 Package, Product Type, Receiver Fail-Safe, Supply Voltage Range, Unit Load.
MAX3486EESA+T
✅ 直接替換📋 參考替代品（不在目錄中）
SP3485EN-L
✅ 直接替換聯絡詢價
查看資料表 →XR3078XID-F
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3485ESA+ 規格
| Product Type | RS-485/RS-422 transceiver |
| 供應電壓 | 3.3 V |
| Maximum Data Rate | 10 Mbps |
| Driver Count | 1 |
| Receiver Count | 1 |
| Supported Standards | RS-485 and RS-422 |
| Driver Architecture | Slew-rate-limited true transceiver |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
| Power Class | Low-power transceiver |
| Production Status | PRODUCTION |
MAX3485ESA+ 8-pin soic 腳位配置指南
MAX3485ESA+（8-pin soic 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MAX3485ESA+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3485ESA+ 適用於 6 應用s: Industrial RS-485 Control Bus, Point-to-Point RS-422 Link, Data Acquisition and Instrumentation, Building Automation and Environmental Monitoring, Embedded Serial Communication Module, Test Equipment and Remote Diagnostics.
Industrial RS-485 Control Bus
The MAX3485ESA+ fits a 3.3 V industrial controller that must communicate with remote actuators, sensors, or PLC modules over a differential bus. Its verified 10 Mbps capability and slew-rate-limited driver provide a practical foundation for reducing edge-rate effects on industrial wiring. The transceiver is used between the controller UART and the A/B bus pair, with the driver enable controlled by the application firmware. Designers must add the appropriate bus termination, biasing, grounding, and protection network, and must verify temperature, ESD, and surge requirements for the installation environment.
推薦
Point-to-Point RS-422 Link
The MAX3485ESA+ is appropriate for a point-to-point RS-422 link when the system needs a 3.3 V differential interface and a controlled, low-power transceiver. One driver and one receiver support the physical-layer signaling, while the verified 10 Mbps capability allows communication rates that exceed common low-speed serial links. The implementation depends on whether the link is full duplex or uses a single differential pair, and termination values must be selected from the cable impedance and topology. Verify the exact receiver and driver pin functions in the manufacturer datasheet before assigning enable and signal-routing logic.
推薦
Data Acquisition and Instrumentation
The MAX3485ESA+ can serve as the communication interface in a 3.3 V data-acquisition instrument that must transfer measurements between a controller, remote sensor, or laboratory peripheral. Differential signaling helps reject common-mode noise compared with a single-ended interface, while the verified slew-rate-limited, 10 Mbps specification supports short- and medium-length links when the bus is correctly terminated. Keep the transceiver close to the connector or cable entry, maintain a continuous ground reference, and place protection components where cable transients can enter the board. The complete measurement accuracy budget should also account for UART timing and receiver performance.
推薦
Building Automation and Environmental Monitoring
The MAX3485ESA+ is suitable for building-automation nodes that connect a low-voltage controller to distributed environmental sensors, dampers, or access-control modules. Its low-power, 3.3 V operation aligns with compact embedded equipment, and the RS-485/RS-422 interface supports robust differential communication over building wiring when the installation follows the required biasing and termination rules. A practical design should include a defined cable fault strategy, connector surge protection, and a power budget that accounts for the transceiver's operating states. Temperature and ESD ratings must be checked for the actual enclosure and cable environment.
推薦
Embedded Serial Communication Module
The MAX3485ESA+ is a practical interface stage for an embedded processor or microcontroller that exposes a 3.3 V UART to an external RS-485 or RS-422 connector. The verified one-driver/one-receiver arrangement keeps the physical layer compact, and the 10 Mbps rating provides margin for links that need more throughput than a slow asynchronous bus. Firmware must control driver direction so that the receiver is not subjected to an unintended transmit state, and the PCB must keep the differential pair geometry consistent. Add ESD protection at the connector and validate cable length and baud rate together.
推薦
Test Equipment and Remote Diagnostics
The MAX3485ESA+ can be used in compact test equipment or remote diagnostic hardware where a controller must exchange commands and status with an external instrument over a differential bus. The confirmed 3.3 V supply, 10 Mbps capability, and slew-rate-limited operation make it a useful building block for short-distance communication paths where lower EMI and controlled edge rates are desired. The system integrator must still verify the full electrical limits, fail-safe behavior, and environmental ratings from the datasheet. Use a defined termination strategy and avoid leaving unused transceiver inputs or outputs in an undefined state.
推薦
推薦產品摘要
工程參考資料，適用於 MAX3485ESA+ — 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 | MAX3486EESA+T | SP3485EN-L | XR3078XID-F |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC candidate |
| Brand | Maxim Integrated | Maxim Integrated | MaxLinear | MaxLinear |
| Product Category | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver | RS-485 transceiver | RS-485 interface candidate |
主要差異化特點
- 10 Mbps verified communication capability (對比SP3485EN-L)
- Dual RS-485 and RS-422 positioning (對比XR3078XID-F)
- Slew-rate-limited driver (對比MAX3486EESA+T)
設計說明
Place the MAX3485ESA+ close to the RS-485/RS-422 connector and route the differential pair as a controlled, impedance-consistent pair. Keep the driver, receiver, protection network, and termination components in the same signal path rather than spreading them across the PCB. This limits radiated emissions and improves the effectiveness of the slew-rate-limited edge control. Confirm the final layer stack, connector geometry, and grounding strategy against the system requirements.
Do not substitute a transceiver solely because its product description says RS-485. Verify the exact SOIC-8 pin map, supply voltage, data rate, receiver thresholds, enable polarity, ESD rating, and temperature range. SP3485EN-L is described by the verified cross-reference data as a functional equivalent and pin-compatible alternative, but it still requires manufacturer-level validation. A same-package candidate can differ in protection, fail-safe behavior, or logic timing even when the basic protocol is the same.
Use the correct bus biasing and termination network for the installed topology. Reflections and common-mode transients can degrade a differential link even when the transceiver itself is operating within its data-rate rating. Keep the ground reference continuous between connected equipment, use a common ground strategy appropriate to the RS-485 interface, and place ESD or surge protection at the connector entry. Validate edge rate, cable length, baud rate, and termination with an oscilloscope in the final mechanical enclosure.
合規資訊
The supplied verified data identifies the MAX3485 family as a 3.3 V, low-power RS-485/RS-422 transceiver in production, but it does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. Compliance fields are therefore left unknown.