SN65HVD31D - 3.3V Full-Duplex RS-485 Transceiver | Texas Instruments
MPN： SN65HVD31D ✓ 啟用中SN65HVD31D 概覽
A differential line transceiver is an interface IC that converts logic-level signals into balanced differential outputs and converts differential bus signals back into logic-level data. This electrical layer sits between a UART, microcontroller, industrial controller, or other digital controller and a wired communication bus. For RS-485 systems, the SN65HVD31 family provides full-duplex operation, allowing the transmitter and receiver to operate simultaneously rather than sharing a single half-duplex bus pair.
The 3 V supply operation suits modern 3.3 V digital systems and helps simplify power architecture around low-voltage processors. Its SOIC-8 package supports conventional surface-mount assembly and provides sufficient pin separation for a communication interface exposed to electrically noisy industrial environments. The operating-temperature option identified for SN65HVD31D extends from -40 °C to 85 °C, covering industrial temperature requirements.
The separate enable inputs provide control over the driver and receiver paths independently. This flexibility is useful when a system needs to isolate a transmitter during bus turnaround, control a receiver during reset, or implement a multidrop full-duplex network. The separate differential driver and receiver pins also permit dedicated transmit and receive cabling, which is the defining architectural feature of a full-duplex bus implementation.
Typical uses include industrial serial links, building-control networks, factory equipment, data-acquisition systems, instrumentation, and communications between circuit cards separated by long cable runs. Because the device implements both RS-422 and RS-485 signaling, engineers can apply it to balanced differential links where noise immunity and signal integrity are more important than single-ended signaling.
PCB design should route the differential driver and receiver traces as a controlled-impedance pair, place termination and protection components where their electrical roles are clear, and keep switching currents away from sensitive logic. Confirm the completed interface against the manufacturer datasheet for bus loading, enable timing, maximum data rate, receiver thresholds, and power-supply decoupling before releasing a production design.
This page combines manufacturer device information, verified ordering details, engineering application guidance, package-aware alternatives, and a parameter comparison to support faster component selection and board-level implementation planning.
直接替換替代品，適用於 SN65HVD31D — 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： SN65HVD31D （相同外形與佔位） — 差異在於 Package, Product Type, Maximum Cable Length, Number of Drivers, Number of Receivers.
SN65HVD30D
✅ 直接替換聯絡詢價
查看資料表 →SN65HVD32D
✅ 直接替換聯絡詢價
查看資料表 →SN65HVD31DR
✅ 直接替換📋 參考替代品（不在目錄中）
SN65HVD31D 規格
| Product Type | Full-duplex differential line transceiver |
| Supported Standards | RS-422 and RS-485 |
| Supply Voltage Range | 3 V to 3.6 V |
| Nominal Supply Voltage | 3.3 V |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Communication Mode | Full-duplex |
| Maximum Cable Length | 1500 m |
| 封裝 | 8-pin SOIC |
| 工作溫度範圍 | -40 °C to +85 °C |
| 安裝類型 | Surface mount |
| Driver and Receiver Control | Separate enable inputs |
SN65HVD31D 8-pin soic 腳位配置指南
SN65HVD31D（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： SN65HVD31D.
請參閱 資料表 以查看完整腳位配置。
典型應用
SN65HVD31D 適用於 6 應用s: Industrial RS-485 Equipment Links, Building and HVAC Control Networks, Factory Data-Acquisition Systems, Instrumentation and Test Equipment, Telecom and Remote Monitoring, Multi-Card Communication Backplanes.
Industrial RS-485 Equipment Links
The SN65HVD31D fits industrial equipment that needs continuous bidirectional communication over a balanced cable. Its 3.3 V operating point, full-duplex driver and receiver arrangement, and 1500 m supported cable length suit distributed controller-to-interface links where a half-duplex turnaround would interrupt data flow. The 8-pin SOIC package also allows the transceiver to be placed close to the board connector, shortening exposed driver and receiver paths while the logic side remains isolated by its differential signaling. Confirm the required data rate, connector ground strategy, protection level, and fault-safe behavior against the manufacturer datasheet before production release.
推薦
Building and HVAC Control Networks
Building-control equipment can use the SN65HVD31D for full-duplex communication between a central controller and field equipment. The 3 V to 3.6 V supply range aligns with common 3.3 V controller electronics, while the differential driver and receiver improve signal integrity over balanced wiring. Cable runs of up to 1500 meters support equipment distributed across floors or service areas. Because full-duplex operation uses independent transmit and receive paths, the controller can receive status information while transmitting commands. Validate topology, grounding, termination, transient protection, and operating temperature at every enclosure location.
推薦
Factory Data-Acquisition Systems
The SN65HVD31D is appropriate for factory data-acquisition equipment that must exchange commands and measurements with remote sensors or test stations. Its full-duplex architecture removes half-duplex direction-turnaround delays, while the balanced RS-422 and RS-485 interface supports reliable communication over longer cable runs. The SOIC-8 package simplifies assembly on compact measurement boards, and the 3.3 V supply reduces the need for level conversion beside modern controller logic. Place the transceiver near the field connector, use controlled-impedance differential routing, and apply appropriate surge protection where cables leave the controlled enclosure.
推薦
Instrumentation and Test Equipment
Laboratory and industrial test equipment can use the SN65HVD31D to connect a controller or host to remote instrumentation over a full-duplex balanced link. The 3.3 V operation allows direct association with modern digital logic, and the 8-pin SOIC package supports compact, serviceable boards. The receiver and driver remain separate, allowing measurements and control traffic to coexist without changing bus direction. For sensitive instrumentation, maintain a controlled return path, separate transceiver switching currents from analog ground, and verify receiver thresholds and maximum data rate against the installed cable and sampling requirements.
推薦
Telecom and Remote Monitoring
Remote monitoring and telecom support equipment can use the SN65HVD31D for a dedicated full-duplex supervisory link between distributed electronics. The 3 V to 3.6 V supply suits 3.3 V system rails, while balanced differential signaling helps preserve data integrity over balanced cabling. A maximum cable length of 1500 meters provides useful design margin for campus, building, or industrial-site links. Use surge protection at externally accessible cable interfaces and follow the manufacturer’s grounding and termination guidance. Receiver behavior and data-rate limits should be confirmed for the selected SN65HVD3x family member.
推薦
Multi-Card Communication Backplanes
The SN65HVD31D can provide dedicated point-to-point full-duplex communication between circuit cards or subsystems. Separate differential transmit and receive pairs make the arrangement suitable for compact backplanes, rack modules, and equipment where each node owns its transmission path. The low 3.3 V supply and SOIC-8 footprint simplify implementation on multi-layer boards. Keep each differential pair routed over a continuous reference plane, avoid stubs, and use the receiver enable during boot or reset when another device could contend for the bus. Coordinate driver-enable timing to prevent simultaneous active drivers on a shared conductor.
推薦
推薦產品摘要
工程參考資料，適用於 SN65HVD31D — 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 | SN65HVD30D | SN65HVD32D | SN65HVD31DR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same |
| Supply Voltage Range | 3 V to 3.6 V | 3 V to 3.6 V | 3 V to 3.6 V | 3 V to 3.6 V |
| Supported Standards | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 | RS-422 and RS-485 |
| Communication Mode | Full-duplex | Full-duplex | Full-duplex | Full-duplex |
| Driver Count | 1 | 1 | 1 | 1 |
| Receiver Count | 1 | 1 | 1 | 1 |
| Maximum Cable Length | 1500 m | 1500 m | 1500 m | 1500 m |
主要差異化特點
- Standard full-duplex family architecture (對比SN65HVD30D)
- Exact SN65HVD31 functional family match (對比SN65HVD31DR)
- Full-duplex RS-422 and RS-485 operation (對比SN65HVD32D)
設計說明
Place the SN65HVD31D close to the board-to-cable connector and route the driver and receiver differential pairs as controlled-impedance traces over a continuous reference plane. Keep the driver output path away from receiver inputs and sensitive analog nodes. Avoid long unprotected copper runs beyond the connector, use matched pair lengths where timing margins are tight, and minimize stubs or test-point structures that create impedance discontinuities.
Use the bypass configuration and capacitor values recommended in the Texas Instruments datasheet, placing the decoupling capacitor close to the supply and ground pins. Keep the high-current driver return path compact so switching current does not share the sensitive signal-ground route. Verify the supply remains within 3 V to 3.6 V at the device under cable load, transient events, temperature change, and the minimum system-supply tolerance.
Do not enable the driver while another transmitter may be active on the same bus conductor. Manage driver-enable and receiver-enable states during reset, firmware startup, and fault recovery to prevent contention. Also confirm the intended topology: a full-duplex device normally uses separate transmit and receive pairs, so a half-duplex wiring scheme must not be copied without changing termination and routing assumptions.
For cables leaving an enclosure, provide the transient and surge protection appropriate to the installation while maintaining the impedance and return path of the differential pair. A shield termination strategy should be selected for the ground and cable environment rather than assumed universally. Keep protection-current paths away from the transceiver and sensitive controller ground, and verify that added protection components do not distort receiver thresholds or the intended maximum data rate.
合規資訊
The device is an industrial-temperature interface IC, but the available product information does not establish RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. Confirm current declarations on the manufacturer product page before regulatory submission.
