P82B715D - 2-Bit 400kHz I2C Bus Extender | Texas Instruments
料号： P82B715D ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.65 | $1.65 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
P82B715D 概述
What is an I2C bus extender? An I2C bus extender, also called an I2C buffer or bus repeater, is an interface IC placed between two bus segments to increase usable bus length and capacitance. It helps a controller and peripheral communicate across wiring where one physical I2C segment alone would be too heavily loaded. The P82B715 belongs to the interface IC hierarchy and separates a main I2C bus from an extended transmission-line segment.
Key features include a 3 V to 12 V operating supply range, 400 kHz signal support, two bidirectional signal channels, and support for higher bus capacitance than the conventional 400 pF I2C limit. According to the Texas Instruments product page and datasheet, the device is intended for I2C and derivative SMBus systems. It is particularly useful when long cables, connectorized wiring, or multiple branches raise total bus capacitance.
The P82B715 uses a split-side arrangement: each buffered path supports a main-bus side and an extended-cable side. This arrangement helps isolate the extended wiring from the main bus and allows the system to tolerate substantially more wiring capacitance. Engineers must still follow the datasheet limits for voltage, current, timing, and cable loading; the part is not a general-purpose differential-line driver.
Typical applications include industrial control modules, sensor networks, test equipment, remote I2C targets, embedded systems, and SMBus-compatible equipment. Its 400 kHz class makes it appropriate for moderate-speed control buses rather than high-speed I2C designs beyond the stated operating range.
Design attention should focus on bus capacitance, pull-up placement, ground continuity, and the separation between main and extended bus sections. Verify signal rise time and timing margin with the actual cable and peripheral loading rather than relying on nominal bus length alone.
This page combines manufacturer specifications, distributor identification, and practical bus-integration guidance to help engineers evaluate the P82B715D for longer or more capacitive I2C wiring.
直接替换替代料： P82B715D ——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： P82B715D （相同外形与封装尺寸） ——差异在于 Package, Architecture, Interface, Supply Voltage (VCC).
快速对比工具——选择替代料号进行并排对比：
P82B715DR
✅ 直接替换✓ 有现货
$0.7587 / 个
查看数据手册 →P82B715TD,112
✅ 直接替换📋 参考替代料（不在目录中）
P82B715TD-T
✅ 直接替换📋 参考替代料（不在目录中）
P82B715D 规格参数
| Product Type | 2-bit bidirectional I2C/SMBus buffer and cable extender |
| Operating Supply Voltage Range | 3 V to 12 V |
| Nominal Maximum Bus Frequency | 400 kHz |
| Bidirectional Data Transfer | Supported |
| Number of Buffered Bits | 2 |
| Extended Bus Capacitance | 3 nF |
| Conventional I2C Bus Capacitance | 400 pF |
| 电源电流 | 22 mA |
| 输入电容 | 3000 pF |
| Delay Time | 250 ns |
| 封装 | 8-pin SOIC (D) |
| 工作温度范围 | -40 C to +85 C |
| 安装类型 | Surface mount |
| Bus Type | I2C/SMBus |
| Architecture | Unidirectional analog current amplification |
P82B715D 8-pin soic (d) 引脚配置指南
P82B715D（8-pin soic (d) 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： P82B715D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
P82B715D 适用于 6 应用s: Industrial I2C Sensor Networks, Remote Sensor Cable Extension, Test and Measurement Equipment, Embedded System Bus Conditioning, SMBus-Compatible Power and Control Modules, Board-to-Board I2C Interconnect.
Industrial I2C Sensor Networks
The P82B715D suits industrial sensor networks where a remote sensor branch introduces more capacitance than a conventional 400 pF I2C bus can comfortably support. Its 3 nF extended-wiring capability and 400 kHz class can help preserve operation across a separated cable segment, while the two bidirectional paths support both clock and data extension. Place the extender between the controller-side bus and the remote branch, then verify pull-up values and rise time against the actual cable and sensor loading. The 250 ns listed delay should be included in system timing analysis, particularly when several peripheral transactions occur in sequence.
推荐
Remote Sensor Cable Extension
Use the P82B715D when temperature, pressure, or motion sensors are located beyond the practical loading distance of a direct I2C connection. The device's 3 V to 12 V supply range and bidirectional analog current-amplification architecture allow the main bus and extended cable section to operate as separate segments. Its 3 nF extended-capacitance target is useful when connectorized cables or long traces add load, but the design must still include correct pull-ups, protection, and grounding. The 400 kHz operating class should be checked against the sensor's communication timing.
推荐
Test and Measurement Equipment
The P82B715D can extend I2C control connections between an instrument controller and a remote fixture, where fixture wiring and adapter cables add capacitance. Its 400 kHz bus class and 3 nF extended-bus capability make it a candidate for moderate-speed automated test systems rather than high-speed memory or display buses. Engineers should keep the extender's delay in the timing budget and validate signal integrity with the complete harness. Because test systems often use long or improvised cables, protection, grounding, and defined cable length are especially important.
推荐
Embedded System Bus Conditioning
The P82B715D is useful in an embedded controller design when a main I2C bus must feed a display board, sensor board, or daughtercard through a protected wiring interface. Its bidirectional 2-bit extender architecture separates the remote load from the main bus and supports 3 V to 12 V operation. The SOIC-8 package simplifies conventional surface-mount layout, but engineers must follow the datasheet pin assignments and place pull-ups where they control rise time and bus capacitance. The added 250 ns delay is acceptable when the system operates within the stated 400 kHz class and has adequate timing margin.
推荐
SMBus-Compatible Power and Control Modules
The P82B715D can support SMBus-derived control wiring when the connected devices use compatible logic levels and electrical timing. The Texas Instruments product page identifies the part as an I2C/SMBus buffer/cable extender, while the 3 nF extended-capacitance capability helps address wiring beyond the normal 400 pF bus limit. It does not translate SMBus protocols or solve incompatible voltage standards, so designers must verify pull-ups, logic thresholds, and fault behavior across the system. A defined power budget should also include the listed 22 mA supply-current specification.
推荐
Board-to-Board I2C Interconnect
The P82B715D is suitable for a board-to-board interconnect when the two boards communicate over an I2C bus but are separated by a cable, connector, or long pair of traces. Its bidirectional extender architecture allows the main and transmission sides to be treated as separate bus sections, reducing the load presented by the remote board. The 8-SOIC package supports standard surface-mount assembly, although the actual footprint and pin mapping must be checked against the datasheet. Validate timing at 400 kHz with the actual connector, pull-ups, capacitance, and ground-return arrangement.
推荐
推荐产品汇总
工程参考数据： P82B715D ——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 | P82B715DR | P82B715TD,112 | P82B715TD-T | PCA9557D | PCF8574PW |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (P) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Function | 2-bit bidirectional I2C/SMBus buffer and cable extender | I2C re-driver; exact function details not fully verified in supplied data | P82B715 family I2C bus extender | P82B715 family variant; exact details not fully verified | I2C I/O expander; not an extender | I2C I/O expander; not an extender |
关键差异点
- Purpose-built I2C cable extension （对比 PCA9557D)
- Wider verified operating class （对比 P82B715DR)
- Extended-load capability （对比 PCF8574PW)
设计说明
Treat the P82B715D as a wired-bus extender, not as a general-purpose high-speed differential driver. Keep the main-bus and extended-cable sections physically organized, maintain a continuous ground return, and verify rise time with the actual cable, connectors, pull-up resistors, and peripheral input capacitance. The listed 250 ns delay and 400 kHz class must be included in the timing budget.
Place the extender close to the split between the main I2C bus and the transmission segment. Keep the protected or extended-side traces away from noisy switching nodes, use a solid ground plane, and avoid long parallel runs with unrelated high-current traces. Confirm the SOIC-8 pin assignments against the manufacturer datasheet before finalizing the footprint.
Do not assume that matching the SOIC-8 package makes every I2C interface IC a replacement. A valid drop-in choice must match pin-to-pin side assignments, supply limits, logic behavior, timing, and bus-loading specifications. The supplied alternatives include related TI variants and interface ICs whose full electrical equivalence is not verified, so validate any substitution against the P82B715 datasheet and the existing PCB.
合规信息
The supplied search results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance should be confirmed from the current Texas Instruments product documentation.