NXP Semiconductors SE95U,025

Overview

SE95U,025 from NXP Semiconductors is an ultra-high-accuracy digital temperature sensor and thermal watchdog IC with 13-bit Sigma-Delta ADC, I²C-bus interface (400 kHz), open-drain OS output, and programmable overtemperature shutdown thresholds (Tos = 80 °C default, Thyst = 75 °C default). It operates across −55 °C to +125 °C and delivers 0.03125 °C resolution for precision thermal drift monitoring in embedded thermal management systems.

For engineers reviewing the SE95U,025 datasheet, SE95U,025 pinout, SE95U,025 application, or SE95U,025 equivalent, this page provides verified functional identity, validated pin mapping for wafer-level implementation, confirmed thermal accuracy (±1 °C from −25 °C to +100 °C), and real-world alternative selection guidance aligned with LM75A compatibility requirements.

Technical Context

The SE95U,025 implements a band-gap-based temperature sensing element coupled with a 13-bit Sigma-Delta ADC, delivering 0.03125 °C resolution and ±1 °C accuracy over −25 °C to +100 °C. Its I²C-bus interface supports up to 8 devices on one bus via A2–A0 address pins and operates at 400 kHz.

It features dual-mode OS output (comparator or interrupt), programmable fault queue (1/2/4/6 consecutive faults), and configurable conversion rates (0.125–30 conversions/s). Power-up defaults include normal mode, OS comparator mode, LOW-active OS, and Tos/Thyst set to 80 °C/75 °C.

Key Specifications

Pinout & Package

SE95U,025 is a wafer-level die (no packaged form factor); its pin functions map identically to SO8 and TSSOP8 variants (SE95D/SE95DP) per NXP's pinout documentation. All eight terminals are electrically defined and validated for die-level integration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75AIDR, SE95U,025 adds 4× finer resolution, programmable fault tolerance, and dual OS modes-enabling adaptive thermal response. Versus STTS751DT, SE95U,025 offers superior accuracy (±1 °C vs ±2 °C) and proven LM75A register compatibility but lacks SMBus ARA and EEPROM calibration.

Availability

SE95U,025 is available at Aetrix Electronics and suitable for server thermal management, industrial PLC safety shutdown, network switch ASIC protection, and medical power supply monitoring requiring stable component supply across long-lifecycle programs.

Supply support for SE95U,025 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 ICs and embedded processing.

The SE95U,025 belongs to NXP's precision thermal sensing product line, designed specifically for high-reliability thermal watchdog and closed-loop thermal management in mission-critical embedded systems.

FAQ

What is the package type of SE95U,025?

SE95U,025 is supplied as a bare die (wafer) without encapsulation. It shares identical pinout, electrical characteristics, and register behavior with the packaged SE95D (SO8) and SE95DP (TSSOP8) variants. Die-level integration requires wire bonding or flip-chip assembly per NXP's wafer specification document SE95_7.

Does SE95U,025 support SMBus Alert Response Address (ARA)?

No, SE95U,025 does not support SMBus ARA. The address 0Ch is reserved and will generate a false alert if used. For SMBus ARA capability, NXP recommends the SE98 family. SE95U,025 is strictly I²C-bus compliant up to 400 kHz and relies on standard polling or OS interrupt signaling for thermal event notification.

What is the default power-on configuration of SE95U,025?

At power-up, SE95U,025 initializes in normal operation mode, OS comparator mode, OS active LOW, Tos = 80 °C, Thyst = 75 °C, fault queue = 1, and conversion rate = 10 conversions/s. The pointer register defaults to 00h (Temp register), allowing immediate temperature reads without prior pointer setup.

How does the OS output behave in comparator versus interrupt mode on SE95U,025?

In comparator mode, SE95U,025's OS output asserts when temperature exceeds Tos and de-asserts when it falls below Thyst-acting like a hardware thermostat. In interrupt mode, OS asserts on Tos breach and remains latched until any register is read or shutdown mode is entered, then re-arms only after Thyst is crossed downward.

Can SE95U,025 replace LM75A in existing designs without hardware changes?

Yes-SE95U,025 is pin-for-pin and register-compatible with LM75A. It uses identical I²C addresses (1001xxx), same Conf/Temp/Tos/Thyst register map, and power-up defaults matching LM75A behavior. Firmware requiring only 9-bit temperature reads or basic thermostat function will operate unchanged with SE95U,025.