NXP Semiconductors PCT2075GVH

Overview

PCT2075GVH from NXP Semiconductors is a digital temperature sensor and thermal watchdog IC with ±1 °C accuracy over −25 °C to +100 °C, 0.125 °C resolution via 11-bit Sigma-Delta ADC, and I²C-bus Fast-mode Plus (1 MHz) interface. It features programmable overtemperature shutdown (Tos) and hysteresis (Thyst) thresholds, open-drain OS output configurable as comparator or interrupt mode, and operates from 2.7 V to 5.5 V - used in system thermal management for industrial controllers and embedded cooling systems.

For engineers reviewing the PCT2075GVH datasheet, PCT2075GVH pinout, PCT2075GVH application, or PCT2075GVH equivalent, key selection considerations include its TSOP6 package, 6-pin I²C address configuration (A0 only), −55 °C to +125 °C operating range, <1.0 μA shutdown current, and drop-in compatibility with LM75-series thermal sensors in space-constrained designs.

Technical Context

The PCT2075GVH integrates an on-chip band-gap temperature sensor with a dedicated 11-bit Sigma-Delta A-to-D converter, delivering 0.125 °C resolution and independent I²C-bus operation that does not interrupt ongoing conversions. Its Temp register holds two 8-bit bytes with 11 valid MSBs, while Tos and Thyst registers use 9-bit two's complement format at 0.5 °C resolution for thermal limit comparison.

It supports dual OS modes: comparator mode (OS toggles between Tos/Thyst thresholds) and interrupt mode (OS latches until register read or shutdown), both with programmable fault queue (1/2/4/6 faults) and active-HIGH/LOW polarity. The device powers up in normal mode with default Tos = 80 °C and Thyst = 75 °C - unless customized, as with PCT2075GV/N005 (Tos = −5 °C, Thyst = −10 °C).

Key Specifications

Pinout & Package

TSOP6 package (SOT1353-1): 6-pin, thin small outline, lead pitch 0.65 mm, body size 1.1 mm × 2.9 mm × 1.05 mm, exposed pad not present.

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, PCT2075GVH delivers finer resolution, lower power, and richer thermal policy control; versus STLM20DD9F, it eliminates external conversion and provides direct digital thermal event signaling - making it optimal for I²C-based embedded watchdog systems.

Availability

PCT2075GVH is available at Aetrix Electronics and suitable for industrial controllers, embedded cooling systems, and server rack thermal monitoring requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for PCT2075GVH 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCT2075GVH belongs to NXP's precision analog sensor product line, designed specifically for high-accuracy, low-power thermal monitoring in space-constrained industrial and embedded systems where autonomous thermal protection is critical.

FAQ

What is the default power-up configuration of the PCT2075GVH?

At power-up, the PCT2075GVH initializes in normal operation mode with OS comparator mode enabled, Tos = 80 °C, Thyst = 75 °C, OS active LOW, and fault queue = 1. The Tidle register defaults to 100 ms sampling interval. These settings allow immediate standalone thermostat operation without host initialization - though all parameters are fully reprogrammable via I²C after boot. The PCT2075GVH retains this behavior unless ordered as a custom variant like PCT2075GV/N005.

How does the PCT2075GVH differ from standard LM75-family devices?

The PCT2075GVH extends LM75 compatibility with 0.125 °C resolution (vs. 0.5 °C), 1 MHz Fast-mode Plus I²C support (vs. 400 kHz), programmable Tidle sampling, configurable fault queue, and dual OS modes - all in the same TSOP6 footprint. Unlike LM75, the PCT2075GVH allows runtime adjustment of thresholds and operating parameters without hardware changes. Its enhanced accuracy and bus robustness make it suitable for next-generation thermal management where legacy LM75 parts fall short.

Can the PCT2075GVH operate with a 3.3 V microcontroller while interfacing to a 5 V I²C bus?

Yes. The PCT2075GVH supports 2.7–5.5 V VCC operation and features overvoltage-tolerant SDA and SCL inputs rated to 5.5 V - meaning it can safely interface to a 5 V I²C bus even when powered from 3.3 V. External pull-ups may be tied to 5 V, and the open-drain OS output also supports 5.5 V pull-up regardless of VCC. This eliminates level-shifting requirements in mixed-voltage systems using the PCT2075GVH.

What is the function of the Tidle register in the PCT2075GVH?

The Tidle register (address 04h) configures the time interval between successive temperature conversions - ranging from 100 ms to 3.1 s in 100 ms increments. By extending idle time, the PCT2075GVH reduces average current consumption (active conversion draws ~70 μA for ~28 ms), making it ideal for battery-powered or energy-sensitive applications. The register uses 5-bit TIDLE[4:0] value; setting it to zero defaults to 100 ms, matching the PCT2075GVH's power-up behavior.

Is the PCT2075GVH pinout compatible with other PCT2075 package variants?

No - the PCT2075GVH (TSOP6) has a distinct 6-pin pinout (A0, GND, VCC, SCL, OS, SDA) incompatible with 8-pin variants (SO8/TSSOP8/HWSON8), which feature A0/A1/A2 address pins and different pin ordering. While functionally identical, the TSOP6 variant omits A1 and A2, limiting I²C address options to three values instead of 27. Board layout must be redesigned when migrating between PCT2075GVH and 8-pin versions - it is not a drop-in mechanical replacement despite shared electrical functionality.