NXP Semiconductors PCA9615DPJ

Overview

PCA9615DPJ from NXP Semiconductors is a 2-channel Fast-mode Plus (1 MHz) differential I²C-bus buffer with hot-swap logic, designed to extend single-ended I²C/SMBus over noisy or long-distance environments using a 4-wire dI²C physical layer. It provides bidirectional signal translation between card-side (VDD(A): 2.3–5.5 V) and line-side (VDD(B): 3.0–5.5 V), supports up to 3 m cable runs, and enables multi-drop differential bus operation in industrial backplanes.

For engineers reviewing the PCA9615DPJ datasheet, PCA9615DPJ pinout, PCA9615DPJ application, or PCA9615DPJ equivalent, key selection criteria include differential noise immunity (±200 mV receive sensitivity), automatic direction detection, hot-swap sequencing timing (≥11 ms ready time), dual-supply level translation, and TSSOP10 package compatibility with PCB space-constrained I²C extension designs.

Technical Context

The PCA9615DPJ implements two independent channel pairs - SCL/SDA to DSCLP/DSCLM and DSDAP/DSDAM - each with fully differential open-drain drivers and receivers. Its hot-swap logic monitors bus idle conditions before enabling connection, uses internal pull-ups on EN (to VDD(A)), and incorporates power-on reset with 1 ms stabilization + 10 ms plug-in debouncing.

Signal direction is protocol-determined and fully automatic; no external control lines are required. The device maintains lock-up free operation during arbitration and clock stretching across dI²C nodes, while supporting static offset on the single-ended side to prevent latch-up when interfacing with other I²C buffers.

Key Specifications

Pinout & Package

TSSOP10 package (SOT552-1), 3 mm body width, surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9617DP and PCA9616PW, the PCA9615DPJ uniquely balances dual-channel dI²C buffering, TSSOP10 compactness, and self-contained hot-swap logic - making it optimal for space-constrained, full-bus-extension applications without external status monitoring.

Availability

PCA9615DPJ is available at Aetrix Electronics and suitable for industrial cabinet interconnect, remote sensor hub interface, commercial lighting control backplane, medical equipment module expansion, and ruggedized I²C extension requiring stable component supply across automotive-grade temperature range (–40 °C to +85 °C).

Supply support for PCA9615DPJ 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, power management, and embedded processing technologies.

The PCA9615DPJ belongs to NXP's differential I²C buffer product line, engineered specifically to solve long-distance, noise-prone I²C communication challenges in harsh industrial and infrastructure environments.

FAQ

What is the maximum supported cable length for PCA9615DPJ at 1 MHz?

The PCA9615DPJ supports ≥3 meters of twisted-pair cable at 1 MHz Fast-mode Plus speed. Longer distances are achievable at reduced clock rates - e.g., up to 10 m at 100 kHz - provided termination remains matched to characteristic impedance (100 Ω nominal) and stub lengths are minimized to preserve signal integrity on the dI²C bus.

Does PCA9615DPJ require external pull-up resistors on the single-ended I²C side?

Yes, PCA9615DPJ requires external pull-up resistors on both SDA and SCL lines of the single-ended I²C bus. Resistor values depend on bus capacitance and speed: ≤3 mA sink for Standard/Fast mode (3 mA max), up to 30 mA for Fast-mode Plus. Typical values range from 1.8 kΩ (for 1 MHz, low capacitance) to 10 kΩ (for 100 kHz, higher capacitance).

Can PCA9615DPJ operate with different VDD(A) and VDD(B) voltages?

Yes, PCA9615DPJ is explicitly designed for dual-supply operation: VDD(A) may be 2.3–5.5 V (card side), and VDD(B) may be 3.0–5.5 V (line side). This enables true level translation - for example, a 3.3 V microcontroller I²C bus can interoperate with a 5 V dI²C backbone and remote 5 V targets, with no shared ground dependency.

How does the EN pin function during hot-swap insertion of a PCA9615DPJ-equipped board?

The EN pin on PCA9615DPJ must be held LOW until power stabilizes and bus idle is confirmed. After VDD(A) and VDD(B) reach regulation, a HIGH transition on EN triggers internal hot-swap logic that waits for a STOP condition or bus idle on the differential side before connecting SDA/SCL to DSDAP/DSDAM and DSCLP/DSCLM - ensuring zero glitch insertion and preventing bus lockup.

Is PCA9615DPJ compatible with standard I²C devices operating below Fast-mode Plus?

Yes, PCA9615DPJ is fully backward compatible with Standard-mode (100 kHz) and Fast-mode (400 kHz) I²C devices, as well as SMBus-compliant components. It transparently passes START, STOP, ACK/NACK, and clock-stretching signals across the dI²C interface without protocol modification or timing alteration - preserving full interoperability with legacy I²C peripherals.