SN65HVD71D - 400kbps Full-Duplex RS-485 Transceiver | Texas Instruments
MPN: SN65HVD71D ✓ نشطSN65HVD71D نظرة عامة
An RS-485 transceiver is an interface integrated circuit that converts logic-level signals into differential bus signals and converts received differential signals back into CMOS-compatible logic. RS-485 extends communication distance and noise immunity compared with single-ended interfaces by using balanced differential signaling. This family belongs to the interface IC hierarchy: transceiver > RS-485 interface > differential bus interface > semiconductor.
The SN65HVD71D provides a 3.3 V supply range of 3 V to 3.6 V, operation from -40 °C to +125 °C, and a data rate up to 400 kbps. Its 12 kV IEC-rated ESD protection helps protect the transceiver when cables are connected to external equipment. Full-duplex operation allows transmitting and receiving simultaneously, which is useful for point-to-point links and systems that cannot wait for a bus turnaround.
Internally, the device combines one differential driver and one differential receiver. The driver accepts a CMOS-compatible transmit input, while the receiver produces a CMOS-compatible receive output. The absence of enable pins simplifies control logic, although the design must manage bus direction externally when the transceiver is connected to a shared multidrop network.
Typical applications include industrial RS-485 links, building automation, factory equipment, motor-control systems, security equipment, and other long-distance serial networks. The device can also support point-to-point RS-422-style connections when the system requires independent transmit and receive paths.
Designers should check the pin assignment and termination requirements in the manufacturer datasheet before layout. A 120-ohm termination resistor is commonly used at each end of a standard RS-485 bus, while bias resistors should be placed only where required. Keep the differential pair routed together, minimize stubs, and provide a stable return path to reduce common-mode noise.
This product page combines the manufacturer's electrical specifications with practical interface guidance, application context, comparison information, and verified sourcing references. It is intended to help engineers identify whether the SN65HVD71D fits a 3.3 V full-duplex RS-485 design before beginning PCB implementation.
بدائل مباشرة لـ SN65HVD71D — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع SN65HVD71D (نفس عامل الشكل والبصمة) — يختلف في Product Type, Package, Driver Enable, ESD Protection, Operating Temperature Range.
SN65HVD70DGSR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←SN65HVD72D
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←SN65HVD73D
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←SN65HVD71D المواصفات
| Product Type | Full-duplex RS-485 and RS-422 transceiver |
| Supply Voltage Range | 3 V to 3.6 V |
| Nominal Supply Voltage | 3.3 V |
| Maximum Data Rate | 400 kbps |
| Driver Channels | 1 |
| Receiver Channels | 1 |
| Duplex Mode | Full duplex |
| ESD Protection | 12 kV IEC |
| نطاق درجة حرارة التشغيل | -40 °C to +125 °C |
| العلبة | 8-pin SOIC (D) |
| نوع التركيب | Surface mount |
| Enable Inputs | None |
| Interface Standard | RS-485 and RS-422 |
| Logic Supply | 3.3 V CMOS-compatible |
| تيار السكون | 1.1 mA |
| Manufacturer Packaging | 2,500 pieces per reel |
دليل تكوين أطراف SN65HVD71D 8-pin soic (d)
تكوين الأطراف لـ SN65HVD71D (حزمة 8-pin soic (d)). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ SN65HVD71D.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
SN65HVD71D مناسب لـ 6 التطبيقs: Industrial RS-485 Control Links, Building Automation Networks, Factory Equipment Communication, Security and Surveillance Equipment, Motor and Machinery Control, Point-to-Point RS-422 Links.
Industrial RS-485 Control Links
The SN65HVD71D suits fixed point-to-point industrial equipment links that require simultaneous transmission and reception. Its 400 kbps maximum data rate is sufficient for supervisory commands, status packets, and sensor data between controllers and remote equipment. The 3 V to 3.6 V supply range permits connection to 3.3 V embedded controllers. Unlike a shared multidrop design, a full-duplex arrangement uses independent differential paths, reducing turnaround delays. Place the transceiver near the cable connector, keep the differential route compact, and apply termination only where required by the bus configuration.
موصى به
Building Automation Networks
The SN65HVD71D can connect building controllers, sensors, actuators, and gateways operating from a 3.3 V supply. Its full-duplex architecture allows a controller to request data while simultaneously receiving acknowledgments or periodic telemetry. The 400 kbps rate provides ample bandwidth for supervisory traffic, while 12 kV IEC ESD protection strengthens the interface against charge on cables entering an electrical enclosure. Keep the bus pair routed over a continuous ground reference and use controlled termination to avoid reflections.
موصى به
Factory Equipment Communication
The SN65HVD71D is appropriate for full-duplex communication between factory controllers and remote equipment where concurrent traffic reduces protocol delays. Its 400 kbps data rate supports machine-state information, configuration data, and diagnostic events. The SOIC package is also compatible with conventional surface-mount assembly methods. For industrial installations, verify the complete signal path against the operating temperature and ESD requirements, provide local decoupling, and avoid long unprotected branch stubs from the main differential pair.
موصى به
Security and Surveillance Equipment
The SN65HVD71D can connect a surveillance controller to a remote camera or access-control unit over a balanced RS-485 link. Full-duplex operation permits continuous command transmission and status reception, which is useful for centralized management. The 400 kbps rate accommodates control and telemetry traffic, while 12 kV IEC ESD protection adds valuable defense where field cables connect to external equipment. Maintain a low-impedance ground relationship between connected systems, route the differential pair together, and install external protection when the cable leaves the protected enclosure.
موصى به
Motor and Machinery Control
The SN65HVD71D supports independent command and feedback paths in motor-control and machinery systems that prefer a full-duplex topology. The transceiver's 400 kbps rate is suitable for position, speed, alarm, and configuration messages rather than high-bandwidth motion streams. Operation from 3.3 V simplifies integration with modern controller logic. Keep the bus interface away from high-current switching paths, use a continuous reference plane beneath the pair, and verify ground potential differences before adding the device to externally powered machinery.
موصى به
Point-to-Point RS-422 Links
The SN65HVD71D's separate differential driver and receiver also support point-to-point RS-422-style links where both ends communicate continuously. The 400 kbps limit provides sufficient bandwidth for command channels, remote I/O, and telemetry. Because it has no enable pins, external direction control is unnecessary for fixed-direction transmit and receive paths. Confirm that the board termination strategy matches the cable length and signal rate, and route the two conductors as a closely coupled differential pair.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ SN65HVD71D — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | SN65HVD70D | SN65HVD72D | SN65HVD73D |
|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
أبرز الفروقات
- Full-duplex operation without enable pins (مقابلSN65HVD37D)
- Single 3.3 V operation with 400 kbps performance (مقابلSN65HVD70D)
- 12 kV IEC-rated bus-side ESD protection (مقابلSN65HVD72D)
- Industrial temperature capability (مقابلSN65HVD73D)
ملاحظات التصميم
Route the two differential bus conductors as a tightly coupled pair with a continuous reference plane beneath them. Keep the transceiver close to the connector, minimize stubs and loop area, and avoid placing the pair alongside switching nodes or high-current return paths. If the cable exits the board, provide a defined chassis or signal-ground strategy and evaluate whether an external TVS or other surge-protection device is required beyond the SN65HVD71D's 12 kV IEC ESD rating.
Do not treat the 12 kV IEC ESD rating as permission to omit system-level cable protection. The rating describes a specified ESD test condition, not immunity to every industrial surge. Check the maximum bus voltage, ground-potential difference, connector construction, cable length, and protection-device stand-off voltage. Also confirm that any external protection does not add excessive bus capacitance or leakage that could distort the 400 kbps signal.
Place the device's supply-decoupling capacitor immediately beside its supply and ground pins, and connect it with the shortest practical ground return. Follow the manufacturer datasheet for the recommended capacitor value and layout. Keep the receive and transmit logic traces away from the bus connector and protection components where possible, because fast edge transitions can couple into high-impedance logic nodes. Confirm all exposed and unused pins against the pin-description table before release.
Select termination and bias networks from the completed topology rather than copying a universal resistor arrangement. In a standard terminated bus, a 120-ohm resistor is commonly placed at each physical end, and fail-safe bias is commonly provided at one location only. The SN65HVD71D has no enable pins, so ensure the external bus design does not require controlled driver shutdown. Confirm signal polarity and naming because differential bus conventions can be described in opposite driver and receiver terms across devices.
معلومات الامتثال
The manufacturer product-page summary identifies 12 kV IEC ESD protection. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statements require confirmation from the manufacturer's compliance documentation.