SN65HVD20D - 25 Mbps Extended Common-Mode RS-485 | TI
部品番号: SN65HVD20D ✓ 生産中SN65HVD20D 概要
An RS-485 transceiver is a physical-layer interface IC that converts logic-level signals into a differential bus and receives differential bus signals back into CMOS-compatible data. Its hierarchy is transceiver → serial interface IC → differential line driver/receiver → communications interface. The SN65HVD20D is designed for industrial data links where long cables, grounded or unearthed systems, and differing ground potentials can place unusually large common-mode voltages on the bus.
Three headline capabilities distinguish this device: its extended common-mode range, 25 Mbit/s maximum data rate, and -27 V to +27 V fault-protection window. The SN65HVD2x family also provides high ESD protection, wide receiver hysteresis, and failsafe operation. These features support reliable detection of small differential signals and recovery from excessive bus voltage, although the exact ESD rating, hysteresis voltage, and operating-temperature limits require confirmation in the manufacturer datasheet.
The SN65HVD20D uses one differential driver and one differential receiver for half-duplex RS-485 communication. In a half-duplex network, transmit and receive functions share the same bus conductors, so system logic must control bus direction and avoid receiver contention. The supplied verification identifies a 5 V nominal operating range, 8-SOIC construction, one transmitter, one receiver, and a 25 Mbit/s maximum signaling rate; additional timing, supply-current, and propagation-delay values were not included in the source extract.
Typical uses include factory automation, industrial instrumentation, building controls, process monitoring, and embedded serial networks. It is particularly relevant where a bus may be exposed to large common-mode offsets, electrostatic discharge events, or accidental fault voltage. The extended fault-protection feature helps the interface survive such transients, but external protection, termination, isolation, and grounding remain system-level design decisions.
For a new PCB, place the transceiver near the bus connector, provide a continuous ground reference, route the differential pair as a tightly coupled pair, and use the bus protection specified by the application. Do not assume the -27 V to +27 V fault range eliminates the need for surge protection in an industrial installation, and verify decoupling requirements directly against the manufacturer datasheet.
This page consolidates verified manufacturer and distributor information, a package-level replacement assessment, an eight-parameter comparison, and practical design notes. It distinguishes documented capabilities from missing electrical details so engineers can make a defensible RS-485 design decision without relying on unverified substitution assumptions.
ドロップイン代替品: SN65HVD20D — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: SN65HVD20D （同一形状・フットプリント） — 相違点: ESD Protection, Product Type.
SN65HVD20DR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN65HVD82D
✅ ドロップイン価格はお問い合わせください
データシートを見る →SN65HVD20D 仕様
| Product Type | Extended common-mode RS-485 transceiver |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Number of Transmitters | 1 |
| Number of Receivers | 1 |
| Duplex Mode | Half-duplex |
| Maximum Signaling Rate | 25 Mbit/s |
| Fault Protection Range | -27 V to +27 V |
| パッケージ | 8-pin SOIC |
| 実装タイプ | Surface mount |
| Standards Compliance | TIA/EIA-485-A |
| Common-Mode Capability | Extended common-mode range |
| ESD Protection | High ESD protection |
| Receiver Hysteresis | Wide receiver hysteresis |
| Failsafe Behavior | Failsafe operation |
SN65HVD20D 8-pin soic ピン配置ガイド
SN65HVD20D (8-pin soic パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: SN65HVD20D.
詳細は データシート をご参照ください。
主な用途
SN65HVD20D の用途: 6 件s: Factory Automation and Industrial Control, Process Monitoring and Instrumentation, Building Automation Networks, Embedded Serial Communication, Remote Sensor Networks, Data Acquisition Terminals.
Factory Automation and Industrial Control
The SN65HVD20D fits half-duplex RS-485 links connecting industrial controllers, sensors, and remote I/O modules because it supports a 4.5 V to 5.5 V supply and signaling rates up to 25 Mbit/s. Its extended common-mode range is valuable when connected equipment has different ground potentials, while the documented -27 V to +27 V fault protection improves tolerance to bus overvoltage. Place the transceiver near the connector, route the differential pair as a coupled pair, and add application-appropriate surge protection. Verify the exact operating-temperature, propagation-delay, and isolation requirements in the manufacturer datasheet before release.
おすすめ
Process Monitoring and Instrumentation
The SN65HVD20D is suitable for measurement systems that distribute data over an RS-485 field bus between instruments, data loggers, and supervisory controllers. The 25 Mbit/s maximum signaling rate supports communication beyond slow polling systems, while wide receiver hysteresis improves recognition of a differential signal after noise and common-mode excursions. Its failsafe behavior is useful when cable faults leave the bus in an undriven state. The design must still account for grounding, cable length, termination, isolated versus non-isolated grounding, and the maximum fault voltage present on externally accessible instrumentation wiring.
おすすめ
Building Automation Networks
The SN65HVD20D can serve the low-voltage RS-485 communication backbone of a building automation controller because it provides one half-duplex channel, a 4.5 V to 5.5 V operating range, and extended common-mode tolerance. These traits help the bus operate between controllers and field devices installed on separate power domains. Its 8-pin SOIC package supports compact controller-board layouts, although an 8-pin footprint leaves no galvanic isolation in the same package. If the network crosses substantial ground offsets or requires regulatory isolation, add an isolated transceiver and isolated power rather than treating the -27 V to +27 V fault range as isolation.
おすすめ
Embedded Serial Communication
The SN65HVD20D is appropriate for embedded systems that expose an RS-485 port for configuration, monitoring, or multi-drop communication. Its one-transmitter, one-receiver arrangement matches a half-duplex point-to-point or multidrop bus, and its maximum 25 Mbit/s signaling rate provides ample link capability for short boards and cabinet-level networks. The host microcontroller must control driver enable so that the receiver is not exposed to a competing driver. Firmware should also provide bus-idle detection, timeout recovery, and safe direction control because propagation delay and maximum bus length were not included in the supplied source extract.
おすすめ
Remote Sensor Networks
The SN65HVD20D supports wired remote-sensor networks that use a shared differential bus for reliable communication over distances greater than a point-to-point logic link. Extended common-mode operation helps when sensors and controllers have different supply references, while high ESD protection is valuable near equipment entry points and connectors. The 4.5 V to 5.5 V supply supports conventional 5 V industrial electronics. For field cabling, retain a continuous signal reference, use twisted differential wiring, place termination only where required by the topology, and use external surge protection if the cable leaves the controlled enclosure or experiences significant lightning exposure.
おすすめ
Data Acquisition Terminals
The SN65HVD20D is well suited to data-acquisition terminals that aggregate measurements from remote transducer interfaces over an RS-485 backbone. Its 25 Mbit/s maximum signaling rate allows the physical layer to support burst-oriented data transfer, while the extended common-mode range improves interoperability across powered equipment with unequal ground references. The 8-pin SOIC package preserves board area in compact terminals. Designers should budget logic-level protection around exposed connectors, confirm that the selected transceiver variant covers the terminal's ambient temperature, and verify the manufacturer's recommended bus bias and termination arrangement for the selected topology.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SN65HVD20D — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SN65HVD20DR | SN65HVD82D |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same |
| Product Type | Extended common-mode RS-485 transceiver | Single transmitter/receiver RS-485 transceiver | Robust RS-485 transceiver |
主な差別化要因
- Documented extended common-mode operation （vs SN65HVD82D)
- Established 25 Mbit/s signaling capability （vs SN65HVD82D)
- Direct same-family package replacement （vs SN65HVD20DR)
設計ノート
Route the differential bus as a tightly coupled pair with continuous ground reference, minimize stub branches, and place the transceiver close to the connector. Keep switching regulators, high-current return paths, and isolated barriers away from the differential traces to reduce differential noise injection. The verified device data confirms an extended common-mode design and high ESD protection, but it does not specify a recommended PCB stack-up; use the manufacturer's layout guidance for controlled-impedance and return-path details.
Do not treat the documented -27 V to +27 V fault-protection range as unlimited surge protection. It describes a bus overvoltage tolerance condition, not a guarantee against arbitrary energy or repeated high-energy transients. Determine whether the installation requires external TVS devices, resistors, isolation, or a protected connector, and verify the resulting component voltages against the transceiver's absolute-maximum ratings in the manufacturer datasheet.
In half-duplex operation, the transmitter and receiver share the bus. Ensure firmware disables the driver whenever the bus is not being transmitted so two enabled drivers cannot fight each other. Include fail-safe biasing where the system topology requires defined bus state, apply termination according to the cable and topology rather than indiscriminately, and validate timing across the complete system. The supplied source did not include propagation-delay or receiver timing values, so those limits must be taken from the official datasheet.
コンプライアンス情報
The supplied verified extracts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.