NXP Semiconductors SE95D,118

Overview

SE95D,118 from NXP Semiconductors is an ultra-high-accuracy digital temperature sensor and thermal watchdog IC with 13-bit Sigma-Delta ADC, I²C-bus interface, open-drain OS output, and programmable overtemperature shutdown thresholds (Tos = 80 °C, Thyst = 75 °C at power-up). It operates from −55 °C to +125 °C with ±1 °C accuracy (−25 °C to +100 °C), 0.03125 °C resolution, and 7.0 µA shutdown current - used for precision thermal monitoring in embedded controllers and PC motherboard thermal management.

For engineers reviewing the SE95D,118 datasheet, SE95D,118 pinout, SE95D,118 application, or SE95D,118 equivalent, key selection considerations include its I²C-compatible 400 kHz interface, 8-device bus addressing via A2–A0 pins, OS comparator/interrupt mode configurability, fault queue programmability (1/2/4/6 consecutive faults), and pin-for-pin compatibility with LM75/LM75A in SO8 packaging.

Technical Context

The SE95D,118 integrates an on-chip band gap temperature sensor with a 13-bit Sigma-Delta ADC delivering 0.03125 °C resolution; register-based configuration enables dynamic control of conversion rate (0.125/1/10/30 Hz), OS polarity (active-HIGH/LOW), and OS operation mode (comparator or interrupt).

Its thermal watchdog logic compares Temp register data against Tos and Thyst registers using only the 9 MSBs for set-point evaluation; OS output activation requires meeting a user-defined fault queue threshold, preventing false triggers from transient noise while maintaining deterministic response in system-level thermal protection.

Key Specifications

Pinout & Package

SE95D,118 is housed in an 8-pin SO8 package (SOT96-1), 3.9 mm body width, surface-mount plastic small outline format compatible with automated PCB 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 LM75AIDR, SE95D,118 delivers 4× higher resolution and configurable fault immunity; versus STTS751DT, it offers simpler register architecture and lower cost but lacks SMBus ARA and EEPROM calibration - making SE95D,118 optimal for cost-sensitive, high-precision thermal watchdog applications where I²C suffices.

Availability

SE95D,118 is available at Aetrix Electronics and suitable for server thermal management, industrial PLC guarding, and PC motherboard fan control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SE95D,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The SE95D,118 belongs to NXP's precision analog sensor product line, engineered specifically for high-accuracy, low-power thermal monitoring and autonomous overtemperature protection in mission-critical embedded systems.

FAQ

What is the default power-up configuration of the SE95D,118?

At power-up, the SE95D,118 initializes in normal operation mode with OS comparator mode enabled, Tos = 80 °C, Thyst = 75 °C, OS active LOW, fault queue = 1, and conversion rate = 10 Hz. This allows immediate standalone thermostat functionality without host initialization - the SE95D,118 begins measuring and asserting OS within ~33 ms after VCC stabilization.

How does the SE95D,118 achieve ±1 °C accuracy across its operating range?

The SE95D,118 achieves ±1 °C accuracy from −25 °C to +100 °C through factory-trimmed band gap sensor calibration and 13-bit Sigma-Delta ADC linearity correction stored in on-die OTP memory. Its accuracy specification excludes the extended −55 °C to −25 °C and +100 °C to +125 °C ranges, where performance degrades to ±2 °C - the SE95D,118 datasheet defines these limits explicitly for design margining.

Can the SE95D,118 be used on the same I²C bus as other LM75-family devices?

Yes, the SE95D,118 is pin-for-pin and register-compatible with LM75 and LM75A, sharing identical I²C slave address structure (1001xxx) and register map layout. Its A2–A0 pins allow unique addressing alongside legacy LM75 devices, and its default 11-bit Temp read mode ensures seamless firmware interoperability - the SE95D,118 behaves identically to LM75A in basic operation while offering enhanced features when configured.

What is the purpose of the fault queue setting in the SE95D,118 Configuration register?

The fault queue (OS_F_QUE[1:0]) in the SE95D,118 Configuration register defines how many consecutive temperature conversions must exceed Tos before the OS output activates - values are 1, 2, 4, or 6 faults. This prevents spurious OS triggering from transient noise or short thermal spikes, ensuring reliable thermal protection in electrically noisy industrial environments where the SE95D,118 is commonly deployed.

Does the SE95D,118 support both OS comparator and OS interrupt modes simultaneously?

No, the SE95D,118 supports only one OS mode at a time, selected by the OS_COMP_INT bit in the Configuration register: logic 0 enables comparator mode (OS resets automatically when Temp drops below Thyst), logic 1 enables interrupt mode (OS remains asserted until any register is read or shutdown mode is entered). The SE95D,118 does not support concurrent or hybrid operation - mode selection is mutually exclusive and software-configurable.