NXP Semiconductors PCA9510D,112

Overview

PCA9510D,112 from NXP Semiconductors (formerly Philips) is a hot-swappable I²C and SMBus bus buffer IC designed for live insertion of I/O cards into multi-point backplanes. It provides bidirectional SDA/SCL buffering with 1 V precharge on input-only lines, 2.7–5.5 V operation, 0–400 kHz clock support, and open-drain READY signaling. It isolates backplane and card capacitances in CompactPCI, VME, and AdvancedTCA systems.

For engineers reviewing the PCA9510D,112 datasheet, PCA9510D,112 pinout, PCA9510D,112 application, or PCA9510D,112 equivalent, key selection criteria include hot-swap enable timing (130 µs), input-output offset voltage (≤150 mV), precharge voltage (1.0 V typ), READY output drive capability (3 mA sink), and SO8 package compatibility with industrial temperature range (−40 to +85 °C).

Technical Context

The PCA9510D,112 implements a controlled connection circuit that waits for bus idle or STOP condition before enabling bidirectional signal coupling between backplane (SDAIN/SCLIN) and card (SDAOUT/SCLOUT) sides. Its under-voltage lockout (UVLO) and 130 µs initialization delay ensure high-impedance isolation during power-up and ENABLE assertion.

Unlike the PCA9511, the PCA9510D,112 omits rise-time accelerator circuitry-eliminating 2 mA transient pull-up current-to prevent interference in multi-device systems. It retains 1 V precharge on all SDA/SCL pins during startup via 100 kΩ internal resistors, minimizing insertion transients when backplane and card logic levels differ.

Key Specifications

Pinout & Package

PCA9510D,112 is housed in an 8-pin plastic small outline (SO8) package per drawing SOT96-1, with 3.9 mm body width and standard 1.27 mm pitch. Pin 1 is marked with a bevelled corner or dot; the device is not pin-compatible with TSSOP variants (e.g., PCA9510DP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9511D,112, the PCA9510D,112 avoids accelerator-induced noise in dense backplanes; versus TCA9517DGKR, it delivers deterministic hot-swap timing and higher ESD robustness (2000 V HBM), making it preferred for ruggedized telecom and industrial chassis applications.

Availability

PCA9510D,112 is available at Aetrix Electronics and suitable for CompactPCI, VME, and AdvancedTCA systems requiring stable component supply, long-term industrial lifecycle support, and guaranteed hot-swap interoperability across multi-vendor backplane environments.

Supply support for PCA9510D,112 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 roots in Philips' pioneering I²C technology development.

The PCA9510D,112 belongs to NXP's legacy I²C bus buffer product line, engineered specifically for high-reliability hot-swap infrastructure in modular computing and telecom chassis where live card replacement is mission-critical.

FAQ

What is the function of the READY pin on the PCA9510D,112?

The READY pin on the PCA9510D,112 is an open-drain output that signals successful backplane-to-card connection. It remains LOW during power-up, ENABLE assertion, and bus initialization (130 µs), then transitions HIGH only after detecting bus idle or STOP condition and completing internal precharge. The PCA9510D,112 drives READY LOW again if ENABLE is deasserted or VCC drops below UVLO threshold.

Does the PCA9510D,112 support I²C fast mode Plus (1 MHz)?

No, the PCA9510D,112 supports I²C standard mode and fast mode up to 400 kHz only, as confirmed by its electrical characteristics table and timing specifications. It does not meet the voltage, slew rate, or propagation delay requirements for fast mode Plus (1 MHz). For 1 MHz operation, consider dedicated fast-mode Plus repeaters such as the PCA9617A-not the PCA9510D,112.

Can the PCA9510D,112 be used with 1.8 V I²C buses?

No, the PCA9510D,112 requires a minimum VCC of 2.7 V and has no 1.8 V operation support. Its input thresholds (e.g., ENABLE threshold = 0.5×VCC) and precharge circuitry (1.0 V nominal) are incompatible with 1.8 V logic levels. Using PCA9510D,112 with 1.8 V buses risks unreliable READY assertion, failed idle detection, and undefined precharge behavior.

How does the PCA9510D,112 handle clock stretching during hot-swap?

During clock stretching, the PCA9510D,112 maintains transparent bidirectional buffering once connected-neither adding delay nor interfering with master/slave arbitration. Its connection circuitry recognizes stretched clocks as valid bus activity and does not disconnect. The PCA9510D,112 preserves full I²C protocol fidelity, including multi-master synchronization, because its internal logic operates independently of clock edge timing after READY goes HIGH.

Is the PCA9510D,112 pin-compatible with the PCA9510DP variant?

No, the PCA9510D,112 (SO8, SOT96-1) and PCA9510DP (TSSOP8, SOT505-1) share identical pin functions and ordering codes but differ in physical package dimensions, lead pitch, and thermal characteristics. They are not mechanically interchangeable-PCB footprints, reflow profiles, and board-level stress tolerance differ. The PCA9510D,112 cannot be substituted for PCA9510DP without layout revision.