NXP Semiconductors SE98APW,118

Overview

SE98APW,118 from NXP Semiconductors is a JEDEC JC-42.4-compliant digital temperature sensor optimized for DDR2/DDR3 memory module thermal monitoring, delivering ±0.5 °C (typ.) accuracy between +75 °C and +95 °C, 11-bit ΔΣ ADC with 0.125 °C resolution, and I²C/SMBus interface operating from 1.7 V to 3.6 V.

For engineers reviewing the SE98APW,118 datasheet, SE98APW,118 pinout, SE98APW,118 application, or SE98APW,118 equivalent, this page delivers verified JEDEC-grade thermal sensing specs, TSSOP8 pin mapping, EVENT output configuration options, and DIMM-specific register initialization guidance - all validated against NXP's Rev. 04 product data sheet.

Technical Context

The SE98APW,118 implements an on-chip 11-bit ΔΣ ADC that performs local temperature conversions at ≥8 Hz (125 ms period), latching results into a 16-bit Temperature Register (05h). Its SMBus/I²C interface supports 0–400 kHz operation with built-in TIMEOUT (25–35 ms) and ALERT functionality, and uses three address pins (A0–A2) to enable up to eight devices on one bus.

It features programmable EVENT output modes - comparator (window-based active-HIGH/LOW), interrupt (edge-triggered with software-clearable status), or critical-only - with user-selectable hysteresis (0 °C, 1.5 °C, 3 °C, 6 °C) and independent trip-point registers for Upper (02h), Lower (03h), and Critical (04h) thresholds, all defaulting to zero at power-up and requiring explicit initialization.

Key Specifications

Pinout & Package

TSSOP8 package (SOT530-1), 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SE98APW,118, SE98ATP,118 offers superior thermal dissipation in space-constrained DIMMs, while SE97APW,118 trades JEDEC compliance and low-voltage operation for higher supply tolerance - making SE98APW,118 the optimal choice for modern DDR2/DDR3 modules requiring 1.7–3.6 V compatibility and ±0.5 °C accuracy.

Availability

SE98APW,118 is available at Aetrix Electronics and suitable for DDR2/DDR3 memory module manufacturing, enterprise server thermal management, and laptop motherboard design requiring stable component supply, JEDEC-compliant accuracy, and long-term industrial lifecycle support.

Supply support for SE98APW,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 communication infrastructure markets.

The SE98A family was designed specifically to meet JEDEC JC-42.4 thermal sensor requirements for DDR memory modules, emphasizing precision, low-power operation, and SMBus interoperability in high-density memory subsystems.

FAQ

What is the guaranteed accuracy of SE98APW,118 across its full operating range?

The SE98APW,118 guarantees ±1 °C (maximum) accuracy from +40 °C to +125 °C and ±2 °C (maximum) from −40 °C to +125 °C. Its key specification is ±0.5 °C (typical) / ±1 °C (maximum) between +75 °C and +95 °C - the JEDEC JC-42.4 TS3000B1 DIMM thermal zone - confirmed in NXP's Rev. 04 datasheet Section 2.

Does SE98APW,118 require external components for basic I²C operation?

Yes, SE98APW,118 requires external pull-up resistors on both SDA and SCL lines (typically 2.2–10 kΩ depending on bus capacitance and speed), plus a 100 nF ceramic decoupling capacitor between VDD and VSS close to the package. The EVENT pin also needs a pull-up resistor (0.9–3.6 V) to function as an active-HIGH or active-LOW alarm signal.

How is the EVENT output configured for critical temperature shutdown in SE98APW,118?

The SE98APW,118 configures critical shutdown by writing the desired threshold to the Critical Alarm Trip register (04h), setting CONFIG[7] = 1 (TCRIT enable), CONFIG[2] = 1 (TCRIT-only mode), and CONFIG[3] = 1 (EVENT output enabled). Once triggered, the EVENT pin remains asserted until temperature falls below Tth(crit) − Thys - it cannot be cleared via software or SMBus ALERT.

Can SE98APW,118 operate on a 1.8 V DDR3 memory bus without level shifters?

Yes, SE98APW,118 operates natively from 1.7 V to 3.6 V, making it fully compatible with standard 1.8 V DDR3 VDDQ rails. Its I²C/SMBus interface tolerates VDD-referenced logic levels, and its open-drain SDA/SCL pins eliminate need for external level translators when interfacing with 1.8 V host controllers.

What initialization steps are mandatory before SE98APW,118 begins accurate temperature reporting?

Before reliable operation, SE98APW,118 requires programming of the Configuration register (01h) to set hysteresis, EVENT mode, and enable; Upper (02h), Lower (03h), and Critical (04h) trip registers; and optionally disabling SMBus TIMEOUT (bit 7 of 22h). Default values are all zero - unconfigured, the device outputs 0 °C and EVENT remains disabled.