NXP Semiconductors PCT2075TP,147

Overview

PCT2075TP,147 from NXP Semiconductors is an I²C-bus Fast-mode Plus digital temperature sensor and thermal watchdog IC with ±1 °C accuracy from −25 °C to +100 °C, 0.125 °C resolution, open-drain OS output, and HWSON8 (2 mm × 3 mm) package - used for system-level thermal monitoring and overtemperature shutdown in embedded controllers and power management circuits.

For engineers reviewing the PCT2075TP,147 datasheet, PCT2075TP,147 pinout, PCT2075TP,147 application, or PCT2075TP,147 equivalent, key selection considerations include its 11-bit Sigma-Delta ADC, programmable Tos/Thyst thresholds, 27-device I²C address flexibility, <1.0 μA shutdown current, and drop-in compatibility with LM75-series thermal sensors in space-constrained designs.

Technical Context

The PCT2075TP,147 integrates an on-chip band-gap temperature sensor with a 11-bit Sigma-Delta A-to-D converter, delivering 0.125 °C resolution and ±1 °C max error over −25 °C to +100 °C. Its I²C interface supports Fast-mode Plus (1 MHz, 30 mA SDA drive) with SMBus time-out (25–35 ms) and overvoltage-tolerant SDA/SCL inputs up to 5.5 V.

It implements dual OS operation modes - comparator mode (thermostat behavior with hysteresis) and interrupt mode (latched fault signaling reset by register read) - both configurable via the 8-bit Configuration register. Fault queue depth (1/2/4/6 faults), OS polarity (active-HIGH/LOW), and temperature sampling period (100 ms to 3.1 s via Tidle register) are fully programmable.

Key Specifications

Pinout & Package

Package: HWSON8 (SOT1069-2), 2 mm × 3 mm × 0.8 mm, thermally enhanced no-lead package with exposed center pad requiring PCB thermal vias for optimal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor and thermal watchdog applications.

Compared with LM75BIMM/NOPB and STTS751DT, the PCT2075TP,147 uniquely balances high accuracy (±1 °C), programmable thermal response, ultra-low shutdown current, and scalable I²C addressing - making it optimal for industrial and compute thermal management where reliability, configurability, and footprint efficiency are jointly prioritized.

Availability

PCT2075TP,147 is available at Aetrix Electronics and suitable for server thermal management, industrial PLC guarding, smart power supply sensing, and consumer battery pack safety requiring stable component supply across long production lifecycles.

Supply support for PCT2075TP,147 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal sensor interfaces and power-efficient embedded systems.

The PCT2075TP,147 belongs to NXP's precision analog sensor portfolio, designed specifically for robust, programmable thermal monitoring in space- and power-constrained embedded systems where reliability and I²C scalability are essential.

FAQ

What is the default power-up configuration of the PCT2075TP,147?

At power-up, the PCT2075TP,147 initializes in normal operation mode with OS comparator mode enabled, Tos = 80 °C, Thyst = 75 °C, OS active LOW, and fault queue = 1. The Temp register reads 0 °C until the first 28 ms conversion completes. This allows immediate stand-alone thermostat operation without host initialization.

Does the PCT2075TP,147 support I²C Fast-mode Plus, and what are the electrical requirements?

Yes, the PCT2075TP,147 supports I²C Fast-mode Plus (1 MHz) with 30 mA SDA drive capability. SDA and SCL inputs are overvoltage tolerant to 5.5 V regardless of VCC voltage. External pull-up resistors (~1.5 kΩ) are required on both lines, and SMBus time-out (25–35 ms) is enabled by default to prevent bus hang.

How does the OS output behave in comparator versus interrupt mode on the PCT2075TP,147?

In comparator mode, the OS output asserts when temperature exceeds Tos and resets only when it falls below Thyst - behaving like a hardware thermostat. In interrupt mode, OS asserts on Tos breach and remains latched until any register is read; subsequent trips require crossing Thyst first. Both modes respect the programmed fault queue and OS polarity.

Can the PCT2075TP,147 be used with different supply voltages while interfacing to a 5 V I²C bus?

Yes - the PCT2075TP,147 operates from 2.7 V to 5.5 V and its SDA and SCL pins are overvoltage tolerant to 5.5 V. This allows direct connection to 5 V I²C buses even when VCC = 3.3 V, eliminating level shifters. The OS output can also be pulled up to 5.5 V independently of VCC.

What thermal design considerations apply to the HWSON8 package of the PCT2075TP,147?

The HWSON8 package (SOT1069-2) features an exposed center pad that must be soldered to a dedicated PCB thermal pad with ≥4 thermal vias (0.3 mm diameter) to the internal ground plane. Failure to do so degrades thermal resistance, increases self-heating error, and risks long-term reliability - especially above 85 °C ambient.