THVD1400DR - 3.3-5V RS-485 Transceiver, 500Kbps, 8-SOIC | Texas Instruments
부품 번호: THVD1400DR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.41 | $141.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $1.05 | $1,050.00 |
| 2,500 | $0.92 | $2,300.00 |
THVD1400DR 개요
What is an RS-485 transceiver? An RS-485 transceiver is a type of differential line driver/receiver interface IC that converts a single-ended TTL/CMOS logic signal into a balanced differential signal on a twisted-pair bus, and vice versa. RS-485 belongs to the broader TIA/EIA-485 family of serial interface standards and is widely used in industrial automation, building control, and long-distance communication. The transceiver sits between a UART/MCU and the physical bus, providing the voltage translation, drive strength, and ESD protection required to survive harsh electrical environments.
Key features include 1/8 unit load support (allowing up to 256 nodes on the bus), ±12-kV IEC 61000-4-2 contact discharge ESD protection on bus pins, hot-plug support with glitchless power-up, and an extended industrial operating temperature range of -40 °C to +125 °C. The THVD1400DR also integrates thermal shutdown, current limiting on driver outputs, and receiver fail-safe for open, shorted, or idle bus conditions, eliminating the need for external biasing resistors on many designs.
The architecture combines a precision differential line driver with a high-CMRR receiver and on-chip charge-pump-generated drive rails. The wide bus common-mode range of -7 V to +12 V lets the device tolerate ground potential differences between nodes across long cable runs. The 8-pin SOIC footprint provides drop-in compatibility with industry-standard pinout, simplifying PCB reuse and second-sourcing.
Typical applications include industrial fieldbus networks (Modbus, Profibus-compatible), HVAC building automation, solar inverter daisy-chains, motor drive control links, smart-grid metering, and any point-to-point or multi-drop RS-485 link requiring IEC-grade ESD robustness. The low quiescent current also makes it suitable for battery-backed or always-on telemetry nodes.
When designing with this device, place 100 nF decoupling close to VCC and add a 1 µF bulk capacitor when long supply traces are present. For bus termination, use a 120 Ω resistor across the differential pair at the two end nodes only; intermediate nodes should not be terminated to preserve signal integrity on multi-drop buses.
드롭인 대체품: THVD1400DR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: THVD1400DR (동일 폼 팩터 및 풋프린트) — 차이점: Data Rate, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
THVD1420DR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
THVD1500DR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
THVD1520DR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX3078EESA+
✅ 드롭인✓ 재고 있음
$4.65 / 개
데이터시트 보기 →ADM485ARZ-REEL
✅ 드롭인✓ 재고 있음
$1.62 / 개
데이터시트 보기 →SN65HVD485EDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
THVD1400DR 사양
| 기능 | Transceiver |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| 데이터 속도 | 500 kbps (max) |
| Receiver Hysteresis | 50 mV (typ) |
| Bus Common-Mode Voltage | -7 V to +12 V |
| ESD Protection (Bus Pins, HBM) | ±16 kV |
| ESD Protection (Bus Pins, IEC 61000-4-2 Contact) | ±12 kV |
| Unit Load | 1/8 (256 nodes max) |
| 동작 온도 | -40 °C to +125 °C |
| 패키지 | 8-pin SOIC (SOIC-8, D suffix) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
| Receiver Fail-Safe | Yes (open, short, idle bus) |
| Hot-Plug Support | Yes |
THVD1400DR 핀 구성
| 핀 1 | RO — Receiver output (push-pull, CMOS logic level referenced to VCC) |
| 핀 2 | RE — Receiver enable, active-low; tie to GND to enable, to VCC to put receiver in high-Z |
| 핀 3 | DE — Driver enable, active-high; tie to VCC to enable driver output, to GND for high-Z |
| 핀 4 | DI — Driver input (CMOS logic level); high-Z when DE = low |
| 핀 5 | GND — Ground reference for both logic and bus |
| 핀 6 | A — Non-inverting bus pin (driver output / receiver input) |
| 핀 7 | B — Inverting bus pin (driver output / receiver input) |
| 핀 8 | VCC — Supply voltage, 3.0 V to 5.5 V |
일반적인 애플리케이션
THVD1400DR 적합 용도: 6 애플리케이션s: Industrial Fieldbus / Modbus Networks, Solar Inverter String Monitoring, Building Automation / HVAC Control, Motor Drive and Servo Communication, Smart Energy / AMR Metering, Point-of-Sale and Kiosk Peripherals.
Industrial Fieldbus / Modbus Networks
The THVD1400DR is purpose-built for RS-485-based industrial fieldbuses such as Modbus RTU (up to 115.2 kbps), BACnet MS/TP (76.8-115.2 kbps), and Profibus sub-segments running below 500 kbps. The 1/8 unit load lets a single segment host up to 256 nodes - critical for large factory-floor networks with hundreds of PLCs, VFDs, and remote I/O blocks. The ±12 kV IEC 61000-4-2 contact ESD rating on the bus pins eliminates the need for external TVS diodes in most cabinet installations, reducing BOM cost and PCB area. Pair the transceiver with a 3.3 V MCU UART and 120 Ω termination resistors at the two end nodes for a standards-compliant link.
추천
Solar Inverter String Monitoring
In photovoltaic string-monitoring arrays, multiple inverter channels are daisy-chained on an RS-485 bus to report per-panel voltage, current, and temperature back to a central data logger. The THVD1400DR's wide -7 V to +12 V common-mode range tolerates ground potential differences of several volts between physically separated combiner boxes, and the -40 °C to +125 °C industrial temperature range supports outdoor cabinet operation. The 500 kbps cap easily handles the few hundred bytes per second of telemetry typical per node, and the integrated hot-plug support means new panels can be added to the bus without disturbing existing communications.
추천
Building Automation / HVAC Control
BACnet MS/TP and Modbus-based building automation networks use RS-485 to link VAV controllers, smart thermostats, air-handler units, and lighting controllers over hundreds of meters of twisted-pair cabling. The THVD1400DR's 256-node capability supports an entire mid-sized office building on a single bus segment, eliminating repeaters in many designs. Receiver fail-safe biasing on idle, open, and shorted bus conditions prevents spurious UART framing errors when nodes are powered up in arbitrary order - a common issue during commissioning. The 3.3 V supply option interfaces directly to low-power HVAC controller MCUs.
추천
Motor Drive and Servo Communication
Industrial servo drives, stepper controllers, and variable-frequency drives often expose RS-485 commissioning and parameter-tuning ports to PLCs and HMIs. The THVD1400DR's ±12 kV IEC ESD protects the drive's UART from cable-discharge transients when technicians hot-plug a service laptop into the motor cabinet - a frequent field-failure source. The wide common-mode range rejects switching-noise-induced ground shifts between the drive's high-current power section and the control board. 500 kbps is sufficient for parameter upload/download cycles and real-time torque/speed telemetry on most servo protocols.
추천
Smart Energy / AMR Metering
Smart electricity, water, and gas meters use RS-485 sub-networks to aggregate readings from individual meters to a data concentrator before backhaul over cellular or PLC. The THVD1400DR's low quiescent current suits battery-backed or energy-harvesting meters, and the 1/8 unit load allows dense meter clusters on a single segment. The -40 °C to +125 °C range meets outdoor metering cabinet requirements, and the IEC ESD rating survives induced transients from the AC mains environment. Pin compatibility with the THVD1420 lets designers reuse the same PCB for higher-speed DLMS/COSEM protocol stacks if needed later.
추천
Point-of-Sale and Kiosk Peripherals
Retail POS terminals, self-checkout kiosks, and ATM peripherals use RS-485 to daisy-chain receipt printers, customer displays, barcode scanners, and cash-drawer triggers over a single cable harness. The THVD1400DR's 3.3 V supply matches the logic rails of modern POS system-on-chips, and the 500 kbps speed handles aggregated peripheral traffic with margin. The integrated IEC 61000-4-2 ESD rating protects the kiosk's UART from static-discharge events when customers touch the equipment. Receiver fail-safe behavior eliminates UART lockup from unterminated cable runs in field-installed retail deployments.
추천
추천 제품 요약
엔지니어링 참조 데이터: THVD1400DR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | THVD1420DR | THVD1500DR | THVD1520DR | MAX3078EESA+ | ADM485ARZ | SN65HVD485EDR |
|---|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (NS) - same footprint | SOIC-8 (R-8) - same footprint | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices (Maxim) | Analog Devices | Texas Instruments |
| Supply Voltage (VCC) | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 1.65 V to 3.6 V | 3.0 V to 5.5 V | 3.0 V to 3.6 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Data Rate | 500 kbps | 12 Mbps | 500 kbps | 10 Mbps | 16 Mbps | 2.5 Mbps | 2.5 Mbps |
| Unit Load | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/2 (32 nodes) | 1/2 (32 nodes) |
| IEC 61000-4-2 Contact ESD | ±12 kV | ±12 kV | ±12 kV | ±12 kV | ±15 kV | not specified | not specified |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Duplex | Half | Half | Half | Half | Half | Half | Half |
| Unit Price @ 1k (USD, as of 2026-10-16) | 1.05 | ~1.20 | ~1.05 | ~1.15 | ~2.40 | ~1.30 | ~1.45 |
주요 차별점
- Wide 3.0 V to 5.5 V single-supply operation across the same pinout (vs ADM485ARZ (5 V only) / SN65HVD485EDR (5 V only))
- Industry-leading ±12 kV IEC 61000-4-2 contact ESD on bus pins (vs ADM485ARZ (no IEC rating specified))
- 1/8 unit load supporting 256 nodes per bus (vs SN65HVD485EDR (1/2 unit load, 32 nodes))
- Integrated hot-plug glitchless power-up (vs MAX3078EESA+)
- Extended -40 °C to +125 °C industrial temperature range (vs MAX3078EESA+ (-40 °C to +85 °C))
설계 노트
Place a 100 nF ceramic decoupling capacitor as close as possible to the VCC pin (pin 8) of the THVD1400DR, with the ground return via a short trace to the GND pin (pin 5). Add a 1 µF bulk capacitor on VCC if the supply trace is longer than ~25 mm. Keep the bus-side traces (A, B on pins 6, 7) short and routed as a matched differential pair with characteristic impedance of 120 Ω to maximize signal integrity at 500 kbps.
Route the THVD1400DR logic-side signals (RO, RE, DE, DI on pins 1-4) away from the bus-side differential pair to avoid capacitive coupling of switching noise into the bus. If the design includes an isolated RS-485 section, keep the digital isolator's high-side supply (typically 3.3 V or 5 V generated by a small isolated DC-DC) close to the THVD1400DR's VCC pin to minimize transients during bus events.
Do not place termination resistors at every node on a multi-drop RS-485 bus - this loads the drivers and degrades the signal. Only the two end nodes on a bus segment should have 120 Ω termination resistors. For stub-heavy topologies, use 100 Ω resistors in series with each stub to dampen reflections, or switch to a repeater-based star topology. Avoid tying RE high and DE low simultaneously if you need the receiver active - RE must be low for the RO output to be valid.
The THVD1400DR supports 256 nodes at 1/8 unit load, but the maximum bus length depends on data rate per the TIA/EIA-485A guideline of (length in m) × (data rate in bps) ≤ 10^8. At 500 kbps, this allows ~200 m of cable; at 115.2 kbps (Modbus RTU), up to ~870 m. For longer runs or harsh EMI environments, use twisted-pair cable with a dedicated ground return and consider adding common-mode chokes on the bus pins.
The THVD1400DR's SOIC-8 package dissipates negligible power in normal operation (<100 mW typical, even at full 500 kbps into a 60 Ω load). However, sustained bus-short or output-overload conditions can drive the die temperature up rapidly; the on-chip thermal shutdown engages around 170 °C to protect the device. Ensure that bus faults are cleared by upstream protection (e.g., PTC fuses) rather than relying on thermal cycling to avoid latch-up.
규정 준수 정보
RoHS and REACH compliant per TI product page; lead-free SOIC-8 packaging. Not AEC-Q100 qualified - industrial grade only.
