NXP Semiconductors PCT2075DP,118

Overview

PCT2075DP,118 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 programmable overtemperature thresholds. It serves as a system-level thermal monitor in embedded controllers and power management circuits, enabling autonomous thermal shutdown without host intervention.

For engineers reviewing the PCT2075DP,118 datasheet, PCT2075DP,118 pinout, PCT2075DP,118 application, or PCT2075DP,118 equivalent, key selection criteria include its 8-pin TSSOP package, 2.7–5.5 V supply range, 1 MHz I²C-bus compatibility, 11-bit ADC architecture, and drop-in replaceability for LM75-series sensors in thermal management designs.

Technical Context

The PCT2075DP,118 integrates an on-chip band-gap temperature sensor with a sigma-delta A-to-D converter delivering 11-bit two's complement output at 0.125 °C resolution. Its thermal watchdog logic compares real-time temperature against user-programmable Tos and Thyst registers (9-bit, 0.5 °C resolution) and drives the open-drain OS output in either comparator or interrupt mode.

Configuration is managed via an 8-bit Conf register controlling shutdown mode (≤1.0 μA), OS polarity (active-HIGH/LOW), fault queue depth (1/2/4/6 faults), and OS operation mode. The device supports up to 27 addressable units on one I²C bus using three logic-configurable address pins (A0/A1/A2), with bus fault timeout (25–35 ms) preventing lockup.

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1), 3 mm body width, 0.65 mm pitch, exposed pad not present - standard surface-mount footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCT2075DP,118, STTS751DT offers tighter accuracy but removes autonomous thermal response, while MAX31826MUA+ trades I²C simplicity for 1-Wire flexibility and external sensor capability - PCT2075DP,118 uniquely balances precision, autonomy, and bus compatibility in a single 8-pin TSSOP.

Availability

PCT2075DP,118 is available at Aetrix Electronics and suitable for industrial PLCs, server thermal management, automotive climate control, and network infrastructure power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PCT2075DP,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 mixed-signal sensor integration and automotive-grade qualification.

The PCT2075DP,118 belongs to NXP's precision analog sensor family designed for autonomous thermal protection in resource-constrained embedded systems - emphasizing low-power operation, I²C scalability, and drop-in replaceability for legacy thermal monitors.

FAQ

What is the default power-up configuration of the PCT2075DP,118?

At power-up, the PCT2075DP,118 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 holds 0 °C until the first 28 ms conversion completes. This allows immediate stand-alone thermostat functionality without host initialization - a key design feature of the PCT2075DP,118.

How does the PCT2075DP,118 achieve ±1 °C accuracy across −25 °C to +100 °C?

The PCT2075DP,118 achieves ±1 °C accuracy through factory-trimmed calibration of its on-chip band-gap temperature sensor and sigma-delta ADC, with compensation applied across the −25 °C to +100 °C range. This specification is verified per NXP's product data sheet Rev. 10.1 and applies specifically to the PCT2075DP,118 in TSSOP8 packaging under recommended layout and decoupling conditions.

Can the PCT2075DP,118 operate on a 3.3 V I²C bus while pulling SDA/SCL to 5 V?

Yes - the PCT2075DP,118 features overvoltage-tolerant SDA and SCL inputs rated to 5.5 V, and its open-drain SDA and OS outputs can be pulled up to 5.5 V independent of the 2.7–5.5 V VCC supply. This allows direct interfacing with 5 V I²C masters while powered from 3.3 V, eliminating level shifters in mixed-voltage systems using the PCT2075DP,118.

What is the minimum time between successive reads of the Temp register in the PCT2075DP,118?

No minimum delay is required between successive reads of the Temp register in the PCT2075DP,118. The I²C interface operates independently of the sigma-delta converter; reading the register does not interrupt ongoing conversion, and new results are available immediately after the register update. This enables high-frequency polling without data loss - a guaranteed behavior of the PCT2075DP,118 per its functional description.

Does the PCT2075DP,118 support multiple devices on the same I²C bus, and how many?

Yes - the PCT2075DP,118 supports up to 27 devices on a single I²C bus using three address pins (A0/A1/A2), each configurable as HIGH, LOW, or floating. This yields 3³ = 27 unique 7-bit target addresses (1001xxx, 1110xxx, 0101xxx, 0110xxx series). The PCT2075DP,118's TSSOP8 package retains full address pin functionality, enabling dense thermal sensor networks without bus contention.