NXP Semiconductors P82B715TD,118

Overview

P82B715TD,118 from NXP Semiconductors is a bipolar I²C-bus extender IC that buffers both SDA and SCL lines to extend practical bus distance beyond the standard 400 pF capacitance limit. It provides ×10 current amplification from Sx/Sy to Lx/Ly sides, supports 3 V to 12 V supply, operates up to 400 kHz, and maintains full multi-master bidirectional compatibility in industrial sensor networks and modular backplane systems.

For engineers reviewing the P82B715TD,118 datasheet, P82B715TD,118 pinout, P82B715TD,118 application, or P82B715TD,118 equivalent, this device delivers verified 30 mA buffered-side sink capability, <100 mV Sx–Lx offset voltage under full load, 2500 V HBM ESD protection, and SO8 package compatibility with legacy I²C infrastructure - critical for long-cable IPMB, AdvancedTCA, and distributed control designs.

Technical Context

The P82B715TD,118 implements dual identical bidirectional buffer circuits with unity voltage gain but asymmetric current gain: 10× current amplification from Sx/Sy (I²C-bus side) to Lx/Ly (buffered bus side), while providing passive conduction in reverse direction via internal 30 Ω resistors. This architecture enables system-level capacitance scaling to ~3000 pF without altering logic voltage levels or violating open-drain topology.

It requires no external directional control, retains native I²C timing behavior including rise/fall time compliance, and ensures static LOW-level offset remains ≤100 mV across full temperature range (−40 °C to +85 °C) and supply (4.5 V to 12 V). Unlike isolating extenders (e.g., P82B96), it avoids fixed level offsets, enabling interoperability with TTL-level slaves and mixed-voltage bus buffers.

Key Specifications

Pinout & Package

Package: SO8 (plastic small outline, 8 leads, 3.9 mm body width, SOT96-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C-bus extension applications.

Compared with P82B96DP,118 and PCA9600D,118, the P82B715TD,118 trades capacitance isolation for universal voltage-level compatibility - making it the sole choice when interfacing with TTL, low-threshold Fm+ devices, or heterogeneous bus buffers without redesigning pull-up networks or logic thresholds.

Availability

P82B715TD,118 is available at Aetrix Electronics and suitable for industrial sensor networks, AdvancedTCA shelf management, and modular backplane interconnect requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.

Supply support for P82B715TD,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and bus technology.

The P82B715TD,118 belongs to NXP's I²C-bus extender product line, designed specifically to solve long-distance, high-capacitance I²C system challenges in telecom, computing, and industrial automation without compromising protocol compliance.

FAQ

What is the maximum cable length supported by P82B715TD,118 in a standard 100 kHz I²C system?

The P82B715TD,118 supports up to 30 meters of Cat5e twisted-pair cable in typical 100 kHz implementations, as validated in NXP's quick design-in circuit (Figure 9). This assumes 4.7 kΩ pull-ups on each I²C segment and 470 Ω pull-ups at both ends of the cable, yielding ~2530 pF buffered-bus capacitance. Longer runs (up to 50 m) are theoretically possible but require careful layout and EMI mitigation.

Does P82B715TD,118 provide voltage level translation between different I²C voltage domains?

No, the P82B715TD,118 does not perform voltage level translation. Its Sx/Sy and Lx/Ly logic levels track the driven signals independently of VCC, meaning it passes through voltage levels from attached devices. For level shifting, external low-cost transistors or dedicated translators (e.g., PCA9306) must be added - as noted in Section 1 of the datasheet.

Can P82B715TD,118 be used in multi-point (star) topologies with more than two units?

Yes, multiple P82B715TD,118 units can be connected in star or multi-point configurations by linking their Lx/Ly ports, provided total system capacitance remains below ~3000 pF and each Sx/Sy bus stays under 400 pF. Figure 8 demonstrates a working 16-node AdvancedTCA IPMB radial shelf using this architecture.

How does P82B715TD,118 differ from P82B96DP,118 in terms of noise margin compatibility?

The P82B715TD,118 maintains ≤100 mV Sx–Lx offset and no static level shift, ensuring compatibility with TTL and low-VIL slaves (e.g., VIL ≤ 0.4 V). In contrast, P82B96DP,118 imposes a 0.8 V offset on Sx/Sy, which risks violating worst-case VIL margins for such devices - a key differentiator confirmed in Section 8.3 waveform analysis.

What is the minimum recommended VCC for reliable operation of P82B715TD,118 across temperature?

The absolute minimum VCC is 3 V, but full performance (including guaranteed dynamic sink current and timing) is only specified from 4.5 V onward. Below 4.5 V, derated drive currents apply: 24 mA max at Lx/Ly for VCC > 3 V, and increased fall times may occur. Industrial designs should use ≥4.5 V for robustness across −40 °C to +85 °C.