SN65HVD70D - 3.3V Full-Duplex RS-485 Transceiver | TI
MPN： SN65HVD70D ✓ 啟用中SN65HVD70D 概覽
An RS-485 transceiver is an interface IC that converts logic-level signals to and from differential bus voltages. This differential signaling supports noise-resistant, long-distance communication between industrial, communications, and instrumentation systems. Full duplex requires separate differential driver and receiver connections, while the enable inputs allow each direction to be disabled when not required.
The SN65HVD70D operates from a 3.3 V supply and supports signaling rates up to 400 kbps. Its ESD protection includes greater than 30 kV human-body-model exposure and greater than 12 kV IEC 61000-4-2 contact discharge. These protections reduce the risk of electrostatic damage to the bus interface, although correct board-level grounding and surge design remain necessary.
The device uses differential signaling to reject common-mode noise, and its large receiver hysteresis improves tolerance of conducted differential noise. The SN65HVD70D is suitable for bidirectional links where the transmitter must remain enabled during reception or where independent direction control is required. Its 14-pin SOIC package supports conventional surface-mount assembly.
Typical uses include industrial control networks, factory automation equipment, building automation interfaces, communication adapters, and external bus-powered controllers. The separate enable controls can also simplify direction-control logic when the host controller drives the interface directly rather than using an automatic transceiver controller.
For reliable operation, route the differential pair as a tightly coupled pair, provide a low-impedance return path, place termination only at the two physical ends of the bus, and avoid stubs. Verify enable polarity and bus idle states in firmware because incorrect direction timing can create a contention condition on the bus.
This product page combines the manufacturer interface specifications with packaging guidance, application examples, comparison criteria, and drop-in replacement considerations to support faster component selection and PCB implementation.
直接替換替代品，適用於 SN65HVD70D — 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： SN65HVD70D （相同外形與佔位） — 差異在於 Maximum Data Rate, Package, Product Type, Driver Enable, Duplex Mode.
SN65HVD71D
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →SN65HVD1470D
✅ 直接替換📋 參考替代品（不在目錄中）
SN65HVD76D
✅ 直接替換聯絡詢價
查看資料表 →SN65HVD70D 規格
| Product Type | Full-duplex RS-485 transceiver |
| 供應電壓 | 3.3 V |
| Maximum Data Rate | 400 kbps |
| Transceiver Configuration | 1/1 full-duplex transceiver |
| Driver Enable | Yes |
| Receiver Enable | Yes |
| IEC ESD Protection | 12 kV contact discharge |
| Human Body Model ESD Protection | >30 kV |
| Receiver Hysteresis | Large receiver hysteresis |
| 封裝 | 14-pin SOIC (D) |
| 安裝類型 | Surface mount |
SN65HVD70D 14-pin soic (d) 腳位配置指南
SN65HVD70D（14-pin soic (d) 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： SN65HVD70D.
請參閱 資料表 以查看完整腳位配置。
典型應用
SN65HVD70D 適用於 6 應用s: Industrial Control Networks, Factory Automation Equipment, Building Automation Interfaces, Communication Adapters, Test and Measurement Equipment, External Bus-Powered Controllers.
Industrial Control Networks
The SN65HVD70D fits bidirectional control links used between PLCs, motor controllers, sensors, and remote I/O modules. Its 3.3 V supply suits modern embedded industrial equipment, while the 400 kbps maximum rate provides ample margin for command and status traffic below that limit. Differential signaling and large receiver hysteresis improve immunity to conducted noise encountered near motors and switching equipment. The independent driver and receiver enables let firmware control each direction without requiring a separate automatic transceiver controller.
推薦
Factory Automation Equipment
Use the SN65HVD70D for full-duplex communication between factory controllers and distributed equipment where both directions may operate simultaneously. Its 14-pin SOIC package is compatible with standard surface-mount assembly processes, and its 400 kbps rate supports many parameter-setting and diagnostic protocols. The 12 kV IEC contact-discharge protection rating adds valuable robustness at exposed bus connectors, although it does not replace properly coordinated surge protection for the installation environment.
推薦
Building Automation Interfaces
The SN65HVD70D is appropriate for controller boards that exchange full-duplex commands and diagnostics over an RS-485 field bus. A 3.3 V supply simplifies integration with embedded processors, while the 400 kbps rate accommodates common building-automation baud rates with margin. Large receiver hysteresis helps distinguish valid differential states in environments containing switching loads and long cable runs. Enable-controlled direction management is particularly useful where traffic can occur in both directions without half-duplex turnaround delays.
推薦
Communication Adapters
The SN65HVD70D can bridge a 3.3 V host controller to a full-duplex RS-485 network in gateways, protocol converters, and data-acquisition equipment. Its 400 kbps limit accommodates many industrial and instrumentation protocols while keeping the host-side logic operating from the same 3.3 V rail. Separate enable inputs provide deterministic control of transmission and reception, helping firmware avoid bus contention. The differential interface also reduces sensitivity to ground offsets when communicating between differently referenced equipment.
推薦
Test and Measurement Equipment
The SN65HVD70D supports instrument controllers, remote test heads, and laboratory interfaces that require a full-duplex differential link. The 3.3 V operation aligns with modern controller platforms, while the 400 kbps rate is suitable for command, status, and moderate measurement-data transfer. The receiver's large hysteresis improves noise rejection, and the 12 kV IEC ESD rating is useful where users connect cables to external equipment. For bench systems, maintain a consistent ground reference or add isolation when the remote device can develop large ground potential differences.
推薦
External Bus-Powered Controllers
The SN65HVD70D can be used in embedded controllers connected to an external RS-485 network through a protected connector. Its 3.3 V supply supports compact control logic, and the full-duplex architecture permits simultaneous command reception and telemetry transmission without automatic direction control. The 400 kbps rate is suitable for many embedded-control protocols. The 14-pin SOIC package leaves room for separate protection components, while 12 kV IEC contact-discharge capability strengthens the interface against handling and installation transients.
推薦
推薦產品摘要
工程參考資料，適用於 SN65HVD70D — 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 | SN65HVD71D | SN65HVD1470D | SN65HVD76D |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) |
| Product Type | Full-duplex RS-485 transceiver | Full-duplex RS-485 transceiver | Full-duplex RS-485 transceiver | Full-duplex RS-485 transceiver |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Maximum Data Rate | 400 kbps | 400 kbps | 400 kbps | 400 kbps |
| Transceiver Configuration | 1/1 full-duplex | 1/1 full-duplex | 1/1 full-duplex | 1/1 full-duplex |
主要差異化特點
- Full-duplex operation with independent direction enables (對比SN65HVD76D)
- 12 kV IEC contact-discharge protection (對比SN65HVD1470D)
- Greater than 30 kV human-body-model ESD capability (對比SN65HVD71D)
設計說明
Route the two RS-485 conductors as a close-coupled differential pair with continuous reference-plane support. Keep the pair geometry consistent through connectors, test points, and protection components, and avoid creating long stubs. Place optional termination networks at the two physical endpoints of the bus rather than at every node, because excessive parallel termination lowers the effective bus impedance and can impair signal quality.
Do not enable the driver while another transmitter is actively driving the same bus. Coordinate the SN65HVD70D driver-enable and receiver-enable inputs so that a node does not contend with the bus, and ensure the bus presents a valid recessive state whenever the transmitter is disabled. This is especially important in full-duplex systems that allow simultaneous traffic from multiple nodes.
Use the manufacturer pin-description table to identify every supply, ground, differential, and enable connection before layout. Keep the transceiver close to the connector and any external protection network so transient current is diverted before reaching the IC. Provide a low-impedance chassis or signal ground path, and evaluate whether galvanic isolation is required when the connected equipment can develop significant ground-potential differences.
合規資訊
The manufacturer description identifies 12 kV IEC 61000-4-2 contact-discharge and greater than 30 kV human-body-model ESD protection, but separate RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals declarations are not stated.
