MAX3485ECPA+ - 12Mbps RS-485/RS-422 Transceiver | Analog Devices
MPN： MAX3485ECPA+ ✓ 啟用中MAX3485ECPA+ 概覽
A transceiver is an interface IC that combines a differential line driver with a differential receiver so two devices can exchange data over a balanced copper connection. In the RS-485 hierarchy, it belongs to the RS-485/RS-422 interface transceiver class and converts digital logic levels into differential bus signals. The differential signaling improves noise immunity and permits communication over distances greater than those typically supported by single-ended interfaces when the bus is correctly terminated and biased.
The MAX3485ECPA+ combines 3.3V operation with ±15kV ESD protection and a 12Mbps maximum data rate. Its slew-rate-limited driver is designed to minimize cable reflections and reduce EMI, particularly when a board must interoperate with RS-485 equipment designed for controlled edge rates. The device contains one transmitter and one receiver, allowing one node to transmit and receive on a shared half-duplex bus through external direction-control and bus-enable circuitry.
As a true RS-485/RS-422 transceiver, the MAX3485ECPA+ supports point-to-point or multipoint communication architectures using differential bus wiring. Receiver and driver enable controls support half-duplex operation, while a receiver output allows the host interface to interpret bus state. The 3.3V supply keeps the logic interface compatible with low-voltage digital systems, although the complete RS-485 interface still requires attention to grounding, cable topology, termination, biasing, and ESD protection at the connector.
Typical applications include industrial automation equipment, test and measurement instruments, building-control gateways, data-acquisition systems, computer instrumentation, and communications links between embedded controllers and external RS-485 devices. The device is particularly useful when a compact interface must combine RS-422 or RS-485 operation with stronger ESD protection than a basic logic-level transceiver provides.
When designing around the MAX3485ECPA+, place the transceiver close to the connector and route the differential pair as a controlled-impedance pair. Use a termination resistor only at appropriate physical endpoints, and verify that a single termination resistor remains connected while the bus is idle. Confirm direction-control timing and avoid allowing bus-driver and receiver-enable signals to overlap. The 8-pin PDIP package is also convenient for prototypes and through-hole industrial products where hand soldering and inspection are important.
This page combines the manufacturer product information, exact-MPN listing details, interface-family context, replacement analysis, and practical PCB guidance to support faster component selection and implementation. It also distinguishes confirmed drop-in candidates from options that require further electrical verification.
直接替換替代品，適用於 MAX3485ECPA+ — 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： MAX3485ECPA+ （相同外形與佔位） — 差異在於 Mounting Type, Product Type, Driver Architecture, Transceiver Configuration.
MAX3485CPA+
✅ 直接替換聯絡詢價
查看資料表 →MAX3485EPA+
✅ 直接替換聯絡詢價
查看資料表 →MAX3485ECPA+ 規格
| Product Type | RS-485/RS-422 transceiver |
| 供應電壓 | 3.3 V |
| Maximum Data Rate | 12 Mbps |
| ESD Protection | ±15 kV |
| Transceiver Configuration | 1 driver / 1 receiver |
| Communication Mode | Half-duplex |
| Supported Standards | RS-422 and RS-485 |
| Driver Architecture | Slew-rate-limited |
| 封裝 | 8-pin PDIP |
| 安裝類型 | Through-hole |
| ESD Protection Level | ±15 kV |
| Maximum Data Rate | 12 Mbps |
| RoHS 狀態 | Compliant |
MAX3485ECPA+ 8-pin pdip 腳位配置指南
MAX3485ECPA+（8-pin pdip 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： MAX3485ECPA+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3485ECPA+ 適用於 6 應用s: Industrial Automation Interfaces, Building and HVAC Control, Data Acquisition Systems, Test and Measurement Equipment, Embedded Controller Communications, Computer and Peripheral Interfaces.
Industrial Automation Interfaces
The MAX3485ECPA+ fits industrial automation links that require a 3.3V host to communicate with remote sensors, actuators, or programmable controllers over an RS-485 bus. Its 12Mbps maximum data rate provides ample capability for typical control traffic, while the slew-rate-limited driver helps control edge energy and electromagnetic interference. The ±15kV ESD rating also strengthens the interface against electrostatic discharge encountered at external equipment connections. In a complete design, the transceiver still needs appropriate bus termination, fail-safe biasing, grounding, and surge protection according to the installation environment.
推薦
Building and HVAC Control
The MAX3485ECPA+ is suitable for building-control and HVAC equipment that distributes commands and sensor readings across a wired RS-485 network. A 3.3V supply allows direct connection to embedded controllers, while the 12Mbps rate accommodates ordinary room, zone, and controller data traffic. Slew-rate-limited operation reduces unwanted emissions from long cables installed near motors and switching equipment. For dependable field operation, the bus layout should include a common reference strategy, endpoint termination, and protection at any connector exposed to user-accessible cabling.
推薦
Data Acquisition Systems
The MAX3485ECPA+ can connect a laboratory instrument, data logger, or embedded controller to remote RS-485 sensors and measurement modules. Its 12Mbps capability supports fast sampled-data traffic, and the 3.3V supply simplifies integration with modern digital controllers. The differential receiver improves noise tolerance when the measurement system includes switching power converters, long cables, or nearby motors. Engineers should preserve the differential trace geometry, provide a continuous ground reference where appropriate, and select termination values that match the cable impedance and topology.
推薦
Test and Measurement Equipment
The MAX3485ECPA+ is appropriate for bench instruments and portable analyzers that exchange commands or measurement records with external RS-485 equipment. The 8-pin PDIP package supports through-hole assembly and straightforward prototype rework, while the 3.3V operating supply aligns with contemporary digital control hardware. At a 12Mbps maximum rate, the transceiver can serve short, controlled laboratory connections or lower-speed field buses. Operators should still observe bus idle-state behavior, avoid excessive loading, and verify that test leads do not create unterminated stubs that produce reflections.
推薦
Embedded Controller Communications
The MAX3485ECPA+ lets a 3.3V microcontroller or processor communicate with an external RS-485 peripheral through one driver and one receiver. The device’s receiver output supports direct digital input, while the driver input accepts standard logic signals; external direction-control logic determines whether the node transmits. Its 12Mbps capability is more than adequate for status polling, configuration updates, and command traffic in many embedded systems. Firmware and hardware must avoid enabling the driver while the bus is idle in a state that could conflict with another transmitter.
推薦
Computer and Peripheral Interfaces
The MAX3485ECPA+ can bridge a compact computer or controller to legacy RS-422 and RS-485 peripherals used in industrial equipment. Its half-duplex arrangement supports shared-bus communication through a direction control, and the 3.3V logic supply reduces system complexity compared with a 5V interface. The 12Mbps rating allows compatibility with moderately fast links, while ±15kV ESD protection improves robustness at externally accessible ports. A host implementation should include a stable bus driver enable, controlled startup timing, and software that avoids transmitting when another node owns the bus.
推薦
推薦產品摘要
工程參考資料，適用於 MAX3485ECPA+ — 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 | MAX3485CPA+ | MAX3485EPA+ |
|---|---|---|---|
| Package | 8-pin PDIP | 8-pin DIP | 8-pin DIP |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V |
| Supported Interfaces | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 |
| Mounting Type | Through-hole | Through-hole | Through-hole |
主要差異化特點
- Higher confirmed maximum data rate than MAX3485EPA+ (對比MAX3485EPA+)
- Stronger specified ESD protection than the generic MAX3485 family description (對比MAX3485CPA+)
- Same-family pin-compatible replacement path in an 8-pin through-hole package (對比MAX3485EPA+)
設計說明
Place the MAX3485ECPA+ close to the RS-485 or RS-422 connector so the differential route avoids digital clocks, relays, and switching-power nodes. Route A and B as a closely coupled pair, keep their spacing consistent, and connect the transceiver ground reference to the connector ground through a short path. Use a solid ground plane where possible and avoid splitting the plane beneath the interface section.
Do not treat every resistor on an RS-485 bus as a termination device. Install the termination resistor only at the physical ends of the principal trunk, and use approximately the cable characteristic impedance. Stubs should be short. If the MAX3485ECPA+ can be disconnected, use fail-safe biasing so the receiver does not interpret an idle bus as invalid data, and verify the resistor values against the selected bus architecture.
Keep driver-enable and receiver-enable timing free from timing violations at startup or during bus hand-off. The 3.3V transceiver can be damaged or create a bus conflict if the driver remains enabled while another node transmits. Add pull-down or pull-up resistors on control lines as appropriate so the default hardware state is known, and confirm that the host firmware releases the bus before the selected driver is enabled.
合規資訊
The exact-MPN reseller listing identifies MAX3485ECPA+ as RoHS compliant. Other compliance fields are unknown because no manufacturer statements for them are shown in the available records.