P82B96DP - Dual I2C Bus Buffer, 400kHz | NXP
料号： P82B96DP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.15 | $1.15 |
| 10 | $1.04 | $10.40 |
| 100 | $0.92 | $92.00 |
| 500 | $0.81 | $405.00 |
| 1,000 | $0.72 | $720.00 |
P82B96DP 概述
A bus buffer, also called a bus repeater or redriver, is an interface IC inserted between two segments of a shared two-wire bus such as I2C or SMBus. In the system hierarchy of I2C devices, a buffer sits between the I2C master/slave cluster (logic side) and the extended bus segment (physical side), isolating bus capacitance so more devices and longer cables can be added without violating the I2C total capacitance limit defined for standard-bus operation.
Key features include two fully independent buffer channels (S0/Tx0/Rx0 and S1/Tx1/Ry1 pins), voltage-level shifting between standard 3.3 V or 5 V I2C logic and bus rails from 2 V to 15 V, strong sink-current drive for heavily loaded or long cables, and a non-latching architecture. Unlike simpler repeaters, the P82B96 uses offset logic-low levels on the Sx/Sy side so bidirectional data passes without direction-control pins or lock-up.
Architecturally the P82B96 is a bipolar IC, giving it robust, low-impedance bus driving capability. Each buffer separates the capacitance and noise of the remote segment from the local bus, allowing mixed-voltage buses (for example a 5 V MCU talking to a 12 V or 15 V peripheral bus) and drive of resistive cable runs.
Typical applications include I2C bus extension over 10 m to 40 m cables in industrial control panels, level translation between 3.3 V/5 V logic and 12 V or 15 V bus systems, driving large numbers of I2C slaves or LED drivers on one segment, and buffering I2C in point-of-sale, security, and automotive body electronics.
Design consideration: the Sx/Sy side is intended only for standard I2C logic levels; two or more Sx or Sy pins must never be connected together on the same node, as the P82B96 design does not support this configuration.
This page adds value beyond the datasheet by synthesizing distributor pricing, drop-in alternatives, and practical engineering design notes in one place.
直接替换替代料： P82B96DP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
P82B96PW,118
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
P82B96DPZ
✅ 直接替换📋 参考替代料（不在目录中）
P82B96PW
✅ 直接替换📋 参考替代料（不在目录中）
P82B96DP 规格参数
| 功能 | Dual bidirectional bus buffer / redriver |
| Number of Channels | 2 |
| Maximum Data Rate | 400 kHz |
| 接口 | I2C / SMBus |
| Bus Voltage Range (Tx/Rx side) | 2 V to 15 V |
| Logic Side | Standard I2C-bus logic levels (Sx/Sy) |
| Max Cable Length | 40 m |
| Architecture | Bipolar, non-latching, bidirectional |
| 工作温度 | -40C to +85C |
| 封装 | 8-TSSOP |
| 安装类型 | Surface Mount |
| Level Shifting | Yes (2-15 V bus vs standard I2C logic) |
| RoHS 状态 | Compliant |
| 生命周期状态 | Active (per NXP product page) |
P82B96DP 引脚配置
| 引脚 1 | S0 — Channel 0 I2C-bus logic side (standard I2C levels) |
| 引脚 2 | Tx0 — Channel 0 extended-bus transmit/test pin (2-15 V bus side) |
| 引脚 3 | Rx0 — Channel 0 extended-bus receive pin (2-15 V bus side) |
| 引脚 4 | VCC — Supply voltage |
| 引脚 5 | S1 — Channel 1 I2C-bus logic side (standard I2C levels) |
| 引脚 6 | Tx1 — Channel 1 extended-bus transmit/test pin (2-15 V bus side) |
| 引脚 7 | Rx1 — Channel 1 extended-bus receive pin (2-15 V bus side) |
| 引脚 8 | GND — Ground |
典型应用
P82B96DP 适用于 6 应用s: Industrial I2C Bus Extension, Voltage Level Translation (3.3 V/5 V to 12-15 V Bus), Security and Access Control Panels, Driving Large I2C Fan-out Clusters, Automotive Body Electronics, Point-of-Sale and Retail Terminal I2C.
Industrial I2C Bus Extension
In factory automation cabinets, I2C sensors, displays, and remote I/O often sit 10 m to 40 m from the controller - far beyond the unbuffered I2C capacitance limit. The P82B96DP solves this by isolating cable capacitance on its Tx/Rx side while presenting standard I2C logic levels on the Sx/Sy side to the master. Its bipolar output stage sinks the additional current that long cables and multiple pull-ups demand, and the 2 V to 15 V bus range allows noise-margin optimization on noisy runs. Place one buffer near the controller and optionally a second at the far end; data rates up to 400 kHz remain achievable, though reducing to 100 kHz on very long runs improves reliability. The -40C to +85C temperature range suits unconditioned industrial enclosures.
推荐
Voltage Level Translation (3.3 V/5 V to 12-15 V Bus)
Many legacy and industrial buses run at 12 V or 15 V while modern MCUs use 3.3 V or 5 V logic. The P82B96DP directly bridges these domains: its Sx/Sy pins operate at standard I2C logic levels, while the Tx/Rx pins tolerate and drive bus rails from 2 V to 15 V, per the NXP datasheet. The buffer is inserted between the low-voltage controller bus and the high-voltage segment, eliminating discrete transistor level-shift networks and their signal-integrity issues. Because the transfer is non-latching and bidirectional without a direction pin, clock stretching and multi-master arbitration on either side pass through transparently. Designers should size pull-ups on the Tx/Rx side to the high rail and keep the Sx side pulled to its own logic rail.
推荐
Security and Access Control Panels
Security panels distribute I2C to keypads, RFID readers, and sensor clusters over multi-meter cable runs inside buildings. The P82B96DP's 40 m cable capability and strong sink drive maintain signal integrity across these distances, while buffering prevents cable-injected transients from corrupting the controller-side bus. Its 2 V to 15 V bus range permits running the remote segment at elevated voltage for better noise immunity in electrically noisy environments near mains wiring. Two independent channels allow star or daisy-chained topologies with one IC. The non-latching architecture is critical here: bidirectional traffic such as keypad acknowledge cycles and clock stretching passes without direction-control glitches or lock-up, a known failure mode of simpler repeater ICs in long-line systems.
推荐
Driving Large I2C Fan-out Clusters
Designs with many I2C slaves - LED display drivers, RTCs, EEPROMs, and I/O expanders on one bus - accumulate bus capacitance that an MCU pin cannot reliably drive. The P82B96DP splits the bus into a lightly loaded local segment and one or more buffered remote segments, each benefiting from the buffer's low-impedance bipolar drive. Two or more Sx or Sy pins must not be tied to the same node, so each buffered branch uses its own channel or cascaded P82B96 stages. At 400 kHz the buffer maintains the edge rates needed for Fast-mode timing even with dozens of devices. This architecture also isolates a fault or overload on one segment, improving overall system availability in point-of-sale terminals and building controllers.
推荐
Automotive Body Electronics
For door modules, seat controllers, and lighting nodes, the P82B96DPZ variant offers the same dual bus buffering with AEC-Q100 qualification, while the standard P82B96DP serves non-automotive vehicle subsystems. The 2 V to 15 V bus range directly accommodates automotive 12 V battery rails on the remote side, letting an I2C signal traverse a vehicle harness where load-dump and transients demand wide margins. Strong sink drive overcomes the resistance and capacitance of long body-harness wiring, and the -40C to +85C operating envelope covers under-dash and trunk environments. Buffering also isolates the noisy power-domain harness from the delicate controller-side bus, reducing EMI susceptibility. Use RC filtering or TVS protection at harness entry points in addition to the buffer.
推荐
Point-of-Sale and Retail Terminal I2C
POS terminals connect receipt printers, card readers, customer displays, and keypads through docked or cabled peripherals, creating long and variable I2C segments. The P82B96DP buffers each peripheral link so hot-plugging or detaching one peripheral does not drag down the core controller bus. Its non-latching bidirectional transfer handles clock stretching from slower peripheral MCUs transparently, and the 400 kHz data rate keeps transactions responsive. The bipolar architecture tolerates the capacitance swings introduced by docking connectors, which passive switches often cannot. With two channels per IC, a terminal can isolate the display cable and the card-reader cable independently, and the 15 V bus tolerance supports peripherals using higher-voltage signaling for cable robustness.
推荐
推荐产品汇总
工程参考数据： P82B96DP ——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 | P82B96PW,118 | P82B96DPZ | P82B96PW (TI) |
|---|---|---|---|---|
| Package | 8-TSSOP | 8-TSSOP - same | 8-TSSOP - same | 8-TSSOP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| Channels | 2 | 2 | 2 | 2 |
| Maximum Data Rate | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Bus Voltage Range | 2 V to 15 V | 2 V to 15 V | 2 V to 15 V | 2 V to 15 V |
| Max Cable Length | 40 m | 40 m | 40 m | 40 m |
关键差异点
- High-voltage bus side (2 V to 15 V) enables direct drive of 12/15 V bus segments （对比 P82B96PW (TI) - equivalent, but simpler repeaters like PCA9515A cannot)
- 40 m cable extension capability （对比 PCA9306 (passive translator))
- Automotive-qualified sibling on identical footprint （对比 P82B96DPZ)
- Trade-off: standard I2C logic only on Sx side, no paralleling （对比 TCA9517DR)
设计说明
Never connect two or more Sx or Sy I/O pins to the same node. The P82B96 uses offset logic-low voltage levels on the Sx/Sy side specifically to avoid latching of the bidirectional buffer, and the NXP datasheet states the design does not support paralleled Sx pins. If bus fan-out is needed, route each branch through its own channel or cascade buffer stages via Tx/Rx segments. Violating this rule causes bus lock-up that resembles an I2C stuck-low fault and is difficult to diagnose in the field.
Place 100 nF ceramic decoupling close to pin 4 (VCC) with a solid ground return to pin 8. Keep the Sx/Sy (logic) traces short and separated from the Tx/Rx (bus) traces to prevent capacitive coupling of high-voltage bus transients into the logic side. For long external cable runs, add series resistance or TVS protection at the connector, since the buffer's 15 V bus tolerance covers signaling levels but not sustained surge events. Follow the NXP P82B96 datasheet application section for pull-up resistor sizing on the Tx/Rx segment.
On extended cable segments, verify I2C rise times after selecting pull-up values: cable capacitance is typically 50-100 pF/m, so a 40 m run may present several nF and demand low-value pull-ups with the buffer's strong sink capability. If edges are too slow at 400 kHz, drop to 100 kHz Standard-mode - the P82B96's buffering benefit (capacitance isolation and drive strength) is preserved at either speed. Measure undershoot at the Tx/Rx pins; the datasheet application Q&A addresses absolute minimum voltage limits on falling edges.
Estimated: when driving a long bus segment, most of the buffer's power dissipation occurs during bus-low sinking current through pull-up resistors. For example, with 5 k pull-ups to 15 V on the Tx/Rx side and a 50% duty cycle bus, average dissipation is on the order of a few milliwatts, well within the TSSOP-8 thermal capability. Always compute worst-case with your actual pull-up values and bus voltage before finalizing the design.
合规信息
RoHS compliance and active lifecycle status confirmed via NXP product page (Environmental Quality / Shipping tabs). AEC-Q100 qualified version available as P82B96DPZ. REACH, halogen-free and conflict-minerals statements not stated in provided data - consult NXP environmental documentation.
