MAX3485EPA+ - 3.3V 10Mbps RS-485/RS-422 Transceiver
料号： MAX3485EPA+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $16.4371 | $16.44 |
| 10 | $16.4371 | $164.37 |
| 100 | $16.4371 | $1,643.71 |
| 500 | $16.4371 | $8,218.55 |
| 1,000 | $16.4371 | $16,437.10 |
MAX3485EPA+ 概述
An RS-485/RS-422 transceiver is an interface IC that converts logic-level digital signals into balanced differential bus signals and receives differential bus signals back into logic-level outputs. RS-422 commonly supports point-to-point or one-driver topologies, while RS-485 supports multipoint buses and commonly uses termination and biasing. The MAX3485EPA+ combines one transmitter and one receiver in one package, making it suitable for half-duplex communication links, industrial transceivers, and systems that need a compact dual-ended interface.
Key verified features include operation from 3V to 3.6V, a transmission data rate up to 10Mbps, slew-rate limiting for controlled signal propagation, short-circuit current limiting, and thermal shutdown protection that places the driver output into a high-impedance state. The receiver includes a fail-safe feature for improved behavior in bus idle or fault conditions. These functions help designers protect the communication path when the remote bus is shorted or when power dissipation becomes excessive.
The MAX3485 family is positioned between general-purpose digital I/O and full physical-layer network controllers. Compared with an RS-232 transceiver, it uses differential signaling and is better suited to longer, noise-resistant industrial links. Compared with a multi-channel transceiver, the MAX3485EPA+ provides a simpler one-driver, one-receiver implementation in an 8-pin PDIP package. Its through-hole package also makes it convenient for prototypes, repair assemblies, and systems where a surface-mount footprint is not required.
Typical applications include RS-485 industrial sensor links, factory automation equipment, building-control interfaces, data-acquisition systems, instrumentation, and embedded communications modules. In an RS-485 bus, the MAX3485EPA+ can be paired with a microcontroller UART, protection components, termination resistors, and bias resistors. In RS-422 applications, it can support differential point-to-point links with suitable wiring and termination.
Designers should verify the PCB footprint, supply decoupling, bus termination, common-mode limits, grounding, and protection requirements before production use. The verified data does not provide every electrical limit, package dimension, temperature grade, compliance declaration, or full pin-level application detail, so those parameters should be confirmed in the manufacturer datasheet. This page combines verified product information, cross-reference results, application guidance, and drop-in alternatives.
直接替换替代料： MAX3485EPA+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX3485EPA+ （相同外形与封装尺寸） ——差异在于 Mounting Type, Product Type, Package, Data Rate, Low-Power Operation.
快速对比工具——选择替代料号进行并排对比：
SP3485EN-L
✅ 直接替换✓ 有现货
$0.2813 / 个
查看数据手册 →SP3485EP-L
✅ 直接替换📋 参考替代料（不在目录中）
MAX3485EPA
✅ 直接替换📋 参考替代料（不在目录中）
MAX3485CPA+
✅ 直接替换✓ 有现货
$7.4286 / 个
查看数据手册 →MAX3485ESA/GG8
✅ 直接替换📋 参考替代料（不在目录中）
MAX3485EPA+ 规格参数
| Product Type | RS-485/RS-422 interface transceiver |
| Supply Voltage Range | 3 V to 3.6 V |
| Transmission Data Rate | Up to 10 Mbps |
| Driver Count | 1 |
| Receiver Count | 1 |
| Supported Standards | RS-422 and RS-485 |
| Driver Protection | Short-circuit current limiting and thermal shutdown |
| Driver Output State During Thermal Shutdown | High impedance |
| Driver Slew Control | Slew-rate limited |
| Receiver Fail-Safe Feature | Yes |
| 封装 | 8-pin PDIP |
| 安装类型 | Through-hole |
| Operating Voltage | 3.3 V nominal |
MAX3485EPA+ 8-pin pdip 引脚配置指南
MAX3485EPA+（8-pin pdip 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MAX3485EPA+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3485EPA+ 适用于 7 应用s: Industrial RS-485 Sensor Networks, Factory Automation Communication Links, Building Control and HVAC Equipment, Data-Acquisition and Instrumentation Systems, Embedded UART-to-RS-485 Conversion, RS-422 Point-to-Point Communication, Test and Measurement Communication.
Industrial RS-485 Sensor Networks
The MAX3485EPA+ fits industrial sensor networks that use a 3.3V controller and differential RS-485 communication. Its one-driver, one-receiver arrangement can connect a microcontroller UART or measurement controller to remote sensors, while the verified up-to-10Mbps capability supports faster local bus traffic. Slew-rate limiting helps control edge transitions, and short-circuit current limiting plus thermal shutdown improve robustness when a bus fault occurs. The 8-pin PDIP package is practical for industrial controller boards, prototypes, and repair assemblies.
推荐
Factory Automation Communication Links
The MAX3485EPA+ is suitable for factory automation links where a controller must communicate with remote actuators, drives, or equipment over a differential bus. Operation from 3V to 3.6V supports 3.3V embedded systems, while the single-driver, single-receiver structure simplifies half-duplex point-to-point and multidrop RS-485 designs. The verified slew-rate-limited output and fault protection are useful in electrically noisy environments, although cable routing, grounding, termination, and surge protection remain system-level requirements.
推荐
Building Control and HVAC Equipment
The MAX3485EPA+ can be used in building-control equipment that links a low-voltage controller to HVAC units, sensors, dampers, or gateways. The differential RS-485/RS-422 interface is appropriate for wiring that may run between equipment panels, while the 3.3V supply range aligns with embedded controllers. The device’s verified fail-safe receiver feature helps define idle-bus behavior, and the 8-pin PDIP format supports serviceable industrial boards. External protection may be required when field wiring leaves the enclosure.
推荐
Data-Acquisition and Instrumentation Systems
The MAX3485EPA+ is useful for data-acquisition equipment that transfers measurements between a local controller and remote instrumentation. Its verified 10Mbps maximum transmission rate supports high-speed communication over suitable cable lengths and topologies, while differential signaling helps reject common-mode noise. The one-driver, one-receiver format can support RS-422 point-to-point links or RS-485 multidrop buses. Designers should select termination and biasing values based on the bus topology and validate noise performance in the final enclosure.
推荐
Embedded UART-to-RS-485 Conversion
The MAX3485EPA+ provides the physical-layer bridge between a 3.3V UART and an RS-485 bus. A microcontroller can control driver enable or receive logic around the transceiver to implement half-duplex communication. The MAX3485EPA+ supplies one driver and one receiver, making the interface suitable for compact embedded gateways, fieldbus adapters, and service equipment. Its 8-pin PDIP package simplifies through-hole prototyping, while the verified fault protections help manage bus shorts and excessive driver dissipation.
推荐
RS-422 Point-to-Point Communication
The MAX3485EPA+ can be used for RS-422 point-to-point links when differential signaling and controlled edge rates are important. Its verified one-driver, one-receiver configuration maps naturally to a full-duplex or paired communication arrangement, while the up-to-10Mbps capability supports higher-speed equipment links. The 3V to 3.6V operating range fits 3.3V logic. Cable length, impedance, termination, grounding, and common-mode requirements must be evaluated for the specific RS-422 application.
推荐
Test and Measurement Communication
The MAX3485EPA+ can connect test and measurement instruments to a remote controller over RS-485 or RS-422. The 10Mbps verified data-rate capability is useful for local laboratory and industrial test links, while the differential interface helps reduce susceptibility to ground offsets and common-mode noise. The PDIP package is convenient for legacy test equipment and service boards. Confirm signal levels, bus direction, cable length, and protection requirements before connecting instruments with different grounding arrangements.
推荐
推荐产品汇总
工程参考数据： MAX3485EPA+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SP3485EN-L | SP3485EP-L | MAX3485EPA | MAX3485CPA+ |
|---|---|---|---|---|---|
| Brand | Analog Devices | MaxLinear | MaxLinear | Analog Devices | Analog Devices |
| Package | 8-pin PDIP | 8-pin PDIP, verify against manufacturer datasheet | 8-pin PDIP, verify against manufacturer datasheet | 8-pin PDIP | 8-pin PDIP, verify ordering and pinout |
| Product Function | One-driver, one-receiver RS-485/RS-422 transceiver | RS-485/RS-422 transceiver, cross-reference result | RS-485/RS-422 transceiver, cross-reference result | MAX3485 RS-485/RS-422 transceiver | MAX3485 family transceiver |
关键差异点
- Verified 3.3V operating range （对比 SP3485EN-L)
- Verified 10Mbps data-rate capability （对比 SP3485EP-L)
- Verified driver fault behavior （对比 MAX3485CPA+)
- Verified fail-safe receiver behavior （对比 SP3485EN-L)
设计说明
The verified MAX3485EPA+ supply range is 3 V to 3.6 V, so the surrounding 3.3V system must remain within that range during startup, load transients, and fault conditions. Place the device’s normal bypass capacitors close to the supply and ground pins according to the manufacturer layout recommendations. The verified information does not specify a complete decoupling table, so do not infer capacitor values or power-dissipation limits without the datasheet.
Route the differential bus traces as a closely matched pair and keep the RS-485/RS-422 traces away from switching nodes and high-current paths. The MAX3485EPA+ uses differential signaling, but layout still affects signal integrity and common-mode noise. Confirm the 8-pin PDIP footprint from the official package drawing before layout release, especially because the verified search results include different MAX3485 package variants.
Do not assume short-circuit current limiting and thermal shutdown make external protection unnecessary. They improve fault behavior, but an RS-485 field cable can expose the interface to surge, ESD, and ground-potential hazards. Select external protection, grounding, bus termination, and biasing based on the installation environment. Also verify the transceiver’s direction-control logic so the bus is not driven during receive intervals.
The verified MAX3485EPA+ supports data rates up to 10Mbps and uses slew-rate limiting. At the highest rates, cable loss, reflections, stub lengths, loading, and termination placement become increasingly important. Use the shortest practical wiring, follow the bus topology, and validate signal integrity with the actual cable and remote-device loading rather than relying only on the nominal data-rate specification.
合规信息
The supplied verified data does not include RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification declarations. The component is an interface IC and no automotive qualification was stated.