SN65LBC176DR - 10Mbps RS-485 Transceiver 5V | Texas Instruments
料号： SN65LBC176DR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.1818 | $2.18 |
| 10 | $1.5758 | $15.76 |
| 100 | $1.3939 | $139.39 |
| 500 | $1.3333 | $666.65 |
| 1,000 | $1.2727 | $1,272.70 |
SN65LBC176DR 概述
A differential bus transceiver is an interface IC that converts single-ended logic signals into differential signals for transmission over twisted-pair cable, providing high noise immunity for industrial data networks. The SN65LBC176 belongs to the RS-485/RS-422 transceiver family within the broader hierarchy of interface ICs and line drivers, and it meets or exceeds the requirements of ANSI TIA/EIA-485 (RS-485) and ISO 8482:1987 (E).
Key features include a driver enable (DE, active-high) and receiver enable (RE, active-low) that can be tied together to form a single direction-control pin, low-skew LinBiCMOS technology designed for high-speed serial and parallel data transmission, and bus fault protection across a -10V to +15V common-mode range. The driver outputs differential signals on pins A and B while the receiver accepts differential input, allowing direct connection to the multipoint bus. One driver and one receiver per device simplify point-to-point and multidrop network nodes.
The LinBiCMOS process yields low power consumption with high output drive, supporting bus loading of up to 32 unit loads and cable lengths of several thousand feet at lower data rates. Typical applications include industrial automation networks, motor-drive communication links, building automation, energy metering, and any half-duplex RS-485 fieldbus requiring 10 Mbps throughput.
Design tip: bias the bus with fail-safe resistor dividers (typically 560 ohm to the A-line pull-down and B-line pull-up) and terminate both bus ends with 120 ohm to prevent reflections and ensure a defined receiver state when all drivers are disabled.
直接替换替代料： SN65LBC176DR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SN65LBC176DR （相同外形与封装尺寸） ——差异在于 Function, Package, RoHS Status, Signaling Rate, Supply Voltage.
快速对比工具——选择替代料号进行并排对比：
SN65HVD3085EDR
✓ 有现货
$0.32 / 个
查看数据手册 →SN65HVD255DR
✓ 有现货
$1.12 / 个
查看数据手册 →SN65LBC176ADR
📋 参考替代料（不在目录中）
SN75LBC176D
📋 参考替代料（不在目录中）
ST485BDR
📋 参考替代料（不在目录中）
MAX485ESA
📋 参考替代料（不在目录中）
SN65LBC176DR 规格参数
| 功能 | Half-duplex RS-485/RS-422 transceiver |
| Signaling Rate | 10 Mbps (max) |
| 电源电压 | 5 V (nominal) |
| Duplex | Half |
| Transmitters / Receivers | 1 / 1 |
| Protocol Compliance | ANSI TIA/EIA-485 (RS-485), ISO 8482:1987 (E) |
| Fault Protection | -10 V to 15 V common-mode bus range |
| Driver Enable | DE, active-high |
| Receiver Enable | RE, active-low |
| Technology | LinBiCMOS, low skew |
| 工作温度 | -40C to +85C |
| 封装 | 8-SOIC (D), 3.90 mm width |
| 安装类型 | Surface Mount |
| 引脚数 | 8 |
| Bus Loading | Up to 32 unit loads (multipoint) |
| RoHS 状态 | Compliant |
SN65LBC176DR 引脚配置
| 引脚 1 | RO — Receiver output |
| 引脚 2 | RE — Receiver enable (active low) |
| 引脚 3 | DE — Driver enable (active high) |
| 引脚 4 | D — Driver input |
| 引脚 5 | GND — Ground |
| 引脚 6 | A — Driver output / receiver input, non-inverting bus line |
| 引脚 7 | B — Driver output / receiver input, inverting bus line |
| 引脚 8 | VCC — 5V power supply |
典型应用
SN65LBC176DR 适用于 6 应用s: Industrial Automation Fieldbus, Motor Drive Communication Links, Building Automation and HVAC, Energy Metering Networks, Security and Surveillance Camera Buses, Point-to-Point Serial Links and Legacy Board Repair.
Industrial Automation Fieldbus
Factory networks such as Modbus RTU and Profibus-class links rely on half-duplex RS-485 multidrop buses. The SN65LBC176DR fits because its 10 Mbps signaling rate exceeds typical 9600-bps-to-1-Mbps fieldbus needs, and its -10V to +15V common-mode tolerance survives ground-potential differences between machines. DE/RE tied together give one-wire direction control from an MCU UART, and 32-unit-load drive supports dense node counts on a single twisted pair terminated at both ends.
推荐
Motor Drive Communication Links
Variable-frequency drives and servo amplifiers use RS-485 links between the drive controller and remote HMI or PLC. The SN65LBC176DR suits this environment: the -40C to +85C range covers enclosure temperatures near power electronics, and LinBiCMOS low-skew design preserves differential signal integrity over shielded cable in high-EMI switch-mode surroundings. The -10V to +15V fault range tolerates motor-ground noise, while fail-safe biasing keeps the receiver defined when the drive is disabled.
推荐
Building Automation and HVAC
BACnet MS/TP and similar building protocols run half-duplex RS-485 at 9.6 to 115.2 kbps over long controller-area buses. The SN65LBC176DR supports cable lengths of several thousand feet at these rates, and its 3-state driver allows dozens of controllers on one pair. Fail-safe biasing at the bus head end guarantees a defined idle state, and the 5V SOIC-8 footprint drops directly into legacy controller boards designed for classic RS-485 transceivers.
推荐
Energy Metering Networks
Smart-meter concentrators poll meters over RS-485 runs through switchgear where common-mode transients occur. The SN65LBC176DRs -10V to +15V bus fault protection and TIA/EIA-485 compliance directly address these conditions, while its 10 Mbps headroom supports future high-speed reading campaigns. The 8-SOIC package fits compact meter PCBs, and its wide -40C to +85C rating survives outdoor meter cabinets; external TVS diodes are recommended on A/B for surge-prone installations.
推荐
Security and Surveillance Camera Buses
PTZ camera control uses RS-485 (Pelco-D/P style) half-duplex links from DVR/controller to multiple camera heads on one twisted pair. The SN65LBC176DRs 3-state outputs and combined DE/RE direction pin match the multidrop addressing model, and its low-skew LinBiCMOS circuitry keeps 9.6-to-115.2-kbps control traffic clean even on long cable runs. The -40C to +85C range suits outdoor camera enclosures, and bus fault tolerance adds resilience to lightning-induced transients.
推荐
Point-to-Point Serial Links and Legacy Board Repair
For high-speed serial backhaul between two boards (up to 10 Mbps) or repairing legacy RS-422/RS-485 cards, the SN65LBC176DR is a direct fit because it meets both ANSI RS-485 and ISO 8482:1987 (E). Its standard SOIC-8 footprint lets it substitute aged transceivers without PCB rework, and the low driver-receiver skew supports clocked parallel links as well as UART-style serial traffic, per the TI datasheet application guidance.
推荐
推荐产品汇总
工程参考数据： SN65LBC176DR ——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 | SN65LBC176ADR | SN75LBC176D | SN65HVD3085EDR | ST485BDR |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Signaling Rate | 10 Mbps | 30 Mbps | 10 Mbps | 200 kbps | approx. 250 kbps |
| Supply Voltage | 5 V | 5 V | 5 V | 3.3 V / 5 V | 5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C |
| Duplex | Half | Half | Half | Half | Half |
| Protocol Compliance | ANSI RS-485, ISO 8482:1987 (E) | ANSI RS-485, ISO 8482:1987 (E) | ANSI RS-485 | ANSI TIA/EIA-485-A | ANSI RS-485/RS-422 |
关键差异点
- 10 Mbps signaling rate （对比 ST485BDR)
- 30 Mbps upgrade path （对比 SN65LBC176ADR)
- Extended bus fault tolerance （对比 SN65HVD3085EDR)
设计说明
Terminate both physical ends of the twisted-pair bus with 120 ohm resistors matching cable characteristic impedance, and place a 0.1 uF decoupling capacitor within 2 mm of the VCC pin (pin 8) to ground. At 10 Mbps edge rates, stubs longer than a few centimeters on A/B traces cause reflections - route A and B as a matched pair with ground reference, directly to the connector.
Add fail-safe biasing at one point on the bus (typically 560 ohm pull-up on B and 560 ohm pull-down on A at the master node) so the receiver output stays defined when all drivers are tri-stated. Do not omit this - the SN65LBC176 receiver does not include integrated fail-safe inputs, and an unterminated idle bus produces random RO transitions interpreted as framing errors.
Tie DE (pin 3) and RE (pin 2) together and drive them from a single GPIO for one-wire direction control; add a 10 kohm pull-down so the node defaults to receive mode during MCU reset. In electrically noisy motor-drive or surge-exposed environments, add bidirectional TVS diodes on A and B lines to chassis ground and consider an isolated transceiver such as ISO1050 for large ground-potential differences.
合规信息
RoHS compliant per TI product page. AEC-Q100 qualification not stated for standard part (SN65LBC176Q variant exists for automotive-grade applications per TI family description).
