SN65HVD34D - 3V Full-Duplex RS-485 Transceiver | TI
料号： SN65HVD34D ✗ 停产SN65HVD34D 概述
An RS-485 transceiver is an interface IC that converts logic-level signals between a host controller and a differential bus. The RS-485 standard defines a balanced physical layer for robust data transmission over longer distances and in electrically noisy environments. In the hierarchy of electronic components, the SN65HVD34D belongs to the interface IC family and specifically implements a differential line driver, differential receiver, and bus transceiver for industrial communications equipment.
The principal device-level features are its 3 V supply operation, full-duplex communication, RS-485 and RS-422 compatibility, integrated enables, and 14-pin SOIC package. Full-duplex operation is important when transmit and receive paths must operate concurrently rather than sharing a half-duplex bus pair. Separate driver and receiver enables also allow a controller to control the operating state of each circuit independently.
The SN65HVD34D belongs to the SN65HVD3x family of 3.3 V full-duplex RS-485 transceivers. Its receiver and driver sections support balanced differential signaling while presenting a conventional digital interface to the surrounding controller. The manufacturer datasheet is the authoritative source for electrical thresholds, propagation delay, driver-output levels, common-mode limits, and recommended external-network values.
Typical uses include industrial automation controllers, factory data-acquisition equipment, building-control gateways, motor-control interfaces, and instrumentation connected to RS-485 or RS-422 networks. Because the device supports full-duplex communication, it is particularly appropriate for point-to-point links or multi-drop systems designed with separate driver and receiver bus pairs.
When laying out a board, place the transceiver close to the connector and bus-network components, and route the differential pair as a tightly coupled pair with a continuous reference plane beneath it. Confirm the grounding strategy, surge protection, termination, and fail-safe requirements against the manufacturer datasheet for the intended cable and topology.
This page provides a sourcing-oriented product summary, same-family drop-in alternatives, application guidance, comparison parameters, and practical PCB considerations. It helps engineers evaluate the SN65HVD34D efficiently while preserving the distinction between published device facts and design-specific engineering decisions.
直接替换替代料： SN65HVD34D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
SN65HVD35DR
✅ 直接替换📋 参考替代料（不在目录中）
SN65HVD33DR
✅ 直接替换📋 参考替代料（不在目录中）
SN65HVD30DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN65HVD31DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN65HVD32DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN65HVD34D 规格参数
| 电源电压 | 3 V |
| Product Type | RS-485 and RS-422 differential transceiver |
| Duplex Mode | Full-duplex |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Enable Functions | Driver and receiver enables |
| 封装 | 14-pin SOIC (D) |
| 引脚数量 | 14 pins |
| 安装类型 | Surface mount |
| Maximum Signaling Rate | 5 Mb/s |
| Fault Protection Range | -9 V to 14 V |
SN65HVD34D 14-pin soic (d) 引脚配置指南
SN65HVD34D（14-pin soic (d) 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： SN65HVD34D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SN65HVD34D 适用于 6 应用s: Industrial Automation Controller, Factory Data-Acquisition Equipment, Building-Control Gateway, Motor-Control Interface, Test and Measurement Instrumentation, Communication Port Module.
Industrial Automation Controller
The SN65HVD34D fits a full-duplex industrial controller that must exchange deterministic data with field equipment over balanced copper cabling. Its 3 V operation, one differential driver, one differential receiver, and independent enables allow the controller to manage transmit and receive functions separately. The 14-pin SOIC package also keeps the interface compact enough for multi-channel control equipment. For a new design, verify the obsolete lifecycle status and compare an active SN65HVD3x option before committing the production BOM. PCB implementation should preserve a continuous differential return path and place bus protection close to the external connector.
推荐
Factory Data-Acquisition Equipment
SN65HVD34D can provide the physical communication layer for factory data-acquisition equipment connected to a full-duplex RS-485 network. The device combines a 3 V differential driver, differential receiver, and enable controls in a 14-pin SOIC package, allowing a controller to transmit commands and receive measurements concurrently over separate bus pairs. Its identified maximum signaling rate of 5 Mb/s is suitable for short, controlled equipment links when paired with compliant cabling and proper network design. Confirm grounding, cable topology, connector protection, and electrical thresholds against the manufacturer datasheet before deployment in a new instrument.
推荐
Building-Control Gateway
The SN65HVD34D is applicable to a building-control gateway that must connect a controller to full-duplex RS-485 or RS-422 field equipment. Its 3 V supply, differential line driver, differential receiver, and separate enable functions support straightforward logic interfacing while preserving independent control of the two signal directions. The 14-pin SOIC package can simplify routing in compact control boxes, although obsolete lifecycle status makes an active option preferable for new production. Route the bus pair as a coupled differential pair, establish the correct reference and grounding arrangement, and follow the manufacturer recommendations for termination and surge protection.
推荐
Motor-Control Interface
The SN65HVD34D can serve as the communication interface between a motor controller and a full-duplex RS-485 network. The differential driver and receiver provide a balanced physical layer for command transmission and status feedback, while the enable controls allow firmware to control the interface state. Its 3 V operation and 14-pin SOIC package are compatible with compact motor-drive electronics, and the listed fault-protection range of -9 V to 14 V provides a defined operating boundary. Engineers should still verify common-mode limits, transient immunity, ground offsets, and propagation timing for the motor environment before approving the circuit.
推荐
Test and Measurement Instrumentation
SN65HVD34D is suitable for test and measurement instruments that exchange commands and results with remote RS-485 or RS-422 test nodes. Its full-duplex architecture supports simultaneous control and measurement traffic on separate pairs, while the 3 V interface operation can simplify connections to modern control electronics. The device is housed in a 14-pin SOIC package, allowing the transceiver to be placed near the measurement connector or bus isolator. Keep the differential trace away from sensitive analog paths, use a solid reference plane, and validate termination and grounding with the actual cable length. Because the manufacturer lists the device as no longer in production, assess an active alternative for new instruments.
推荐
Communication Port Module
The SN65HVD34D can be used in a modular communication port that exposes a full-duplex balanced bus to a host processor. The one driver and one receiver provide a compact physical-layer solution, while the separate enables allow the host to control transmit and receive activity independently. The 3 V supply and 14-pin SOIC package align with space-constrained interface modules, and the identified 5 Mb/s maximum signaling rate supports short, high-speed links where protocol overhead and cable characteristics permit. Use controlled-impedance routing where appropriate, terminate according to the bus topology, and verify all receive thresholds and timing parameters before releasing the module for production.
推荐
推荐产品汇总
工程参考数据： SN65HVD34D ——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 | SN65HVD35DR | SN65HVD33DR | SN65HVD30DR | SN65HVD31DR | SN65HVD32DR |
|---|---|---|---|---|---|---|
| Package | SOIC-14 (D) | SOIC-14 (D) - same package | SOIC-14 (D) - same package | SOIC-14 (D) - same package | SOIC-14 (D) - same package | SOIC-14 (D) - same package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Duplex Mode | Full-duplex | Full-duplex | Full-duplex | Full-duplex | Full-duplex | Full-duplex |
关键差异点
- Full-duplex driver and receiver with independent enables （对比 SN65HVD33DR)
- Identified 5 Mb/s signaling capability （对比 SN65HVD30DR)
- Defined -9 V to 14 V fault-protection range （对比 SN65HVD35DR)
- Established 14-pin SOIC interface format （对比 SN65HVD31DR)
设计说明
Route the driver and receiver differential pairs as coupled traces over a continuous reference plane. Keep the transceiver close to the external connector so transient energy is intercepted before reaching the IC, and place any protection network at the connector boundary. Avoid routing the bus pair alongside clocks, switching nodes, or high-current motor outputs. The 14-pin SOIC footprint should follow the land pattern and pin sequence published for the SN65HVD34D in the manufacturer datasheet.
Do not assume that a same-package SN65HVD3x device is automatically interchangeable. Although SN65HVD35DR and SN65HVD33DR share the identified 14-pin SOIC and 3.3 V class, receiver thresholds, enable behavior, timing, and protection characteristics still determine system compatibility. Compare the original design against each alternative's manufacturer datasheet, then verify timing margins and bus behavior in hardware before releasing a replacement to production.
Keep the 3 V transceiver rail away from switching-node return currents and decouple it according to the manufacturer layout and component recommendations. The transceiver and its bus network can be exposed to ground-potential differences, so grounding, protection, and common-mode limits must be considered as part of the interface rather than added later. Use the datasheet's recommended network values when they differ from generic RS-485 termination examples.
Texas Instruments states that SN65HVD34D is no longer in production, so an existing qualified assembly should be handled as an obsolete component. Record date code, lot traceability, condition, and inspection requirements for maintenance builds. For a new design, prefer an active part with a documented lifecycle path, and do not approve a substitution solely because the package drawing and nominal supply voltage match.
合规信息
The manufacturer listing confirms the device identity, 3 V operation, full-duplex RS-485 and RS-422 functionality, 14-pin SOIC package, and no-longer-in-production status. Specific environmental and material-compliance declarations are not stated in the available product information.