MAX485EEPA+ - 15kV ESD RS-485 Transceiver | Maxim Integrated
MPN： MAX485EEPA+ ✓ 啟用中MAX485EEPA+ 概覽
An RS-485/RS-422 transceiver is an interface IC that converts logic-level signals to and from differential bus voltages. It belongs to the transceiver hierarchy: interface IC -> RS-485/RS-422 transceiver -> differential communication interface. The MAX485EEPA+ combines a transmitter, receiver, driver-enable control, receiver-enable control, and bus pins in one device, reducing the component count required for a bidirectional serial-data link.
The MAX485EEPA+ provides one transmit channel and one receive channel. Its 15 kV ESD protection is the principal rugged-environment feature identified in the supplied manufacturer-related data. Slew-rate limiting helps control edge speed and reduce reflected-signal and electromagnetic-interference problems on longer cables. The low-power operating mode also makes the device suitable for equipment where the transceiver remains connected to a bus even when communication is inactive.
Communication is established by connecting the differential A and B pins to the twisted-pair bus. The DE input enables the driver, while the active-low RE input enables the receiver. These controls allow the two halves of the transceiver to be disabled independently, supporting point-to-point links, multidrop RS-485 networks, and panel-mounted equipment where a local test loop can be useful. Logic-side signals connect to DI for transmit data and RO for received data.
Typical uses include industrial sensor gateways, programmable logic controller interfaces, building-automation equipment, industrial test instruments, and RS-422 links between equipment cabinets. The 5 V supply matches systems that already operate from regulated 5 V rails. Because the device is half-duplex, software or hardware must control bus direction and avoid transmission conflicts when several nodes share the same pair.
For reliable operation, route the A and B differential pair as a tightly coupled twisted pair, minimize stub branches, and place termination at physical ends of the bus rather than at every node. Provide local supply decoupling and verify that transceiver-enable timing prevents two drivers from driving the bus simultaneously. Unverified transceiver thresholds, current limits, and exact timing values must be confirmed in the manufacturer datasheet before final release.
This product page combines verified distributor descriptions, cross-reference evidence, package and pinout information, replacement guidance, and practical bus-layout considerations. It also distinguishes documented drop-in family options from alternatives that would require a different PCB footprint.
直接替換替代品，適用於 MAX485EEPA+ — 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： MAX485EEPA+ （相同外形與佔位） — 差異在於 Mounting Type, Package, Driver Count, ESD Protection, Maximum Data Rate.
MAX485ECPA+
✅ 直接替換聯絡詢價
查看資料表 →MAX485EPA+
✅ 直接替換聯絡詢價
查看資料表 →MAX485CPA+
✅ 直接替換聯絡詢價
查看資料表 →MAX485EEPA+ 規格
| Transceiver Configuration | 1 transmitter and 1 receiver |
| Communication Standards | RS-422 and RS-485 |
| Operating Mode | Half-duplex |
| Supply Voltage Range | 4.75 V to 5.25 V |
| ESD Protection | 15 kV |
| Power Class | Low-power |
| Driver Slew Rate | Slew-rate-limited |
| Logic Input | 1 data input |
| Logic Output | 1 data output |
| Differential Bus Inputs | 2 differential inputs: A and B |
| Package Type | 8-pin PDIP |
| 安裝類型 | Through-hole |
MAX485EEPA+ 腳位配置
| 腳位 1 | RO — Receiver output |
| 腳位 2 | /RE — Active-low receiver enable |
| 腳位 3 | DE — Driver enable |
| 腳位 4 | DI — Driver input |
| 腳位 5 | GND — Ground |
| 腳位 6 | A — Noninverting differential bus terminal |
| 腳位 7 | B — Inverting differential bus terminal |
| 腳位 8 | VCC — Positive supply |
典型應用
MAX485EEPA+ 適用於 6 應用s: Industrial Sensor Gateway, PLC Communication Interface, Building Automation Controller, Industrial Test Instrument, Remote Instrumentation Link, Data Acquisition Interface.
Industrial Sensor Gateway
The MAX485EEPA+ fits industrial sensor gateways that connect remote sensors over a 4.75 V to 5.25 V logic rail and a shared RS-485 bus. Its documented 15 kV ESD protection improves robustness in environments where cables may be exposed to electrostatic discharge, while slew-rate-limited operation helps control high-frequency content on the differential pair. The one-driver, one-receiver arrangement permits half-duplex communication with a microcontroller or gateway controller. Use DE and active-low RE to control direction, route A and B as a twisted pair, and terminate only the two physical ends of the bus.
推薦
PLC Communication Interface
The MAX485EEPA+ can provide the physical layer for programmable logic controller communication modules operating in industrial control cabinets. A 5 V supply range permits use with regulated controller rails, and the 8-pin PDIP package is convenient for through-hole industrial assemblies. The transceiver's low-power, slew-rate-limited RS-485 operation supports robust field-bus links, while 15 kV ESD protection adds an important tolerance for externally accessible cabling. The controller must assert DE only while transmitting and release the bus whenever another node may drive it.
推薦
Building Automation Controller
The MAX485EEPA+ is appropriate for building-automation controllers that exchange commands and sensor data over an RS-485 segment. The half-duplex architecture supports economical two-wire wiring, and the 15 kV ESD rating is useful when the bus connects to field-installed equipment. Its 4.75 V to 5.25 V operating range fits 5 V embedded systems, while slew-rate limiting helps reduce the high-frequency edge energy seen on longer in-building cables. Maintain a common ground reference according to the bus design, use twisted-pair routing, and avoid excessive inline stubs at controller branches.
推薦
Industrial Test Instrument
The MAX485EEPA+ can connect laboratory or field-test equipment to external RS-485 and RS-422 instruments over a 4.75 V to 5.25 V supply. Its one-transmitter, one-receiver configuration allows command transmission and response reception on the same interface, and the 8-pin PDIP package supports serviceable through-hole construction. Slew-rate-limited drive is beneficial on instrument cables, while 15 kV ESD protection adds resilience when test leads are connected or disconnected. Use controlled enable timing and verify the exact cable length and data rate against the completed transceiver and system specifications.
推薦
Remote Instrumentation Link
The MAX485EEPA+ supports RS-422-style point-to-point links or multidrop RS-485 networks between remote instrumentation modules. The half-duplex arrangement permits bidirectional traffic over a compact interface, and the documented 15 kV ESD protection is valuable for cables running between equipment locations. Its low-power operation and 4.75 V to 5.25 V supply range suit embedded measurement systems. Preserve the differential A-to-B routing, install termination appropriate to the selected topology, and verify input common-mode limits against the final cable environment before deployment.
推薦
Data Acquisition Interface
The MAX485EEPA+ can serve as the communication interface in a distributed data-acquisition system where measured data is transferred from remote modules to a central controller. The transceiver's slew-rate-limited output helps constrain edge rates, and the 15 kV ESD protection improves tolerance to charged cables and connector events. A half-duplex one-transmitter, one-receiver arrangement keeps the bus interface compact, while the 8-pin PDIP package provides straightforward through-hole assembly. Correct enable sequencing prevents bus contention, and matched impedance or approved termination should be placed only where required by the complete bus topology.
推薦
推薦產品摘要
工程參考資料，適用於 MAX485EEPA+ — 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 | MAX485ECPA+ | MAX485EPA+ | MAX485CPA+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP |
| Transmitter and Receiver Count | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver |
| Communication Standards | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 |
| Driver Slew Rate | Slew-rate-limited | Slew-rate-limited | Slew-rate-limited | Slew-rate-limited |
| Power Class | Low-power | Low-power | Low-power | Low-power |
| Operating Mode | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
主要差異化特點
- Documented 15 kV ESD protection (對比MAX485EPA+)
- Low-power RS-485/RS-422 operation (對比MAX485CPA+)
- Slew-rate-limited differential output (對比MAX485ECPA+)
設計說明
Route A and B as a close-coupled pair over the full distance between the transceiver and bus connector. Avoid routing the differential signal over split planes, maintaining a continuous reference plane, and keep the driver traces away from switching power nodes. Keep connector-to-transceiver traces short because the external cable and connector transitions create reflections that the receiver must tolerate.
Ensure the firmware or control logic never leaves DE asserted while another node transmits. Two drivers connected to the same pair can contend and produce an undefined bus voltage. Use pull-up or pull-down bias resistors only as required by the selected system topology, and place termination at the two physical ends of the bus rather than at every node.
The slew-rate-limited driver reduces edge energy but does not remove the need for controlled bus topology. Keep stubs short, use twisted-pair cable, and avoid unnecessary splitters. If switching converters are placed near the transceiver, separate their current paths from the A and B traces and place the transceiver's local supply-decoupling capacitor at the device supply pins according to the manufacturer application circuit.
合規資訊
The supplied search results do not provide extracted RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations for the exact ordering code. AEC-Q100 is not applicable because this is a general-purpose interface transceiver rather than an automotive-qualified variant.