NXP Semiconductors FXTH87EH116T1

Overview

FXTH87EH116T1 from NXP Semiconductors is a fully integrated tire pressure monitoring sensor (TPMS) IC combining an S08 8-bit MCU, MEMS pressure sensor, optional XZ- or Z-axis accelerometer, internal 315/434 MHz RF transmitter, and 10-bit ADC - all in a 7 × 7 mm QFN package. It delivers low-power operation with programmable wake-up intervals (2–128 ms), supports OOK/FSK modulation, and targets direct mounting inside automotive tire valve stems.

For engineers reviewing the FXTH87EH116T1 datasheet, FXTH87EH116T1 pinout, FXTH87EH116T1 application, or FXTH87EH116T1 equivalent, key selection criteria include calibrated pressure range support, dual-axis accelerometer configuration options, RF output power stability over temperature, LF receiver sensitivity for TPMS activation, and FLASH memory retention under vibration stress.

Technical Context

The FXTH87EH116T1 implements a dedicated TPMS measurement sequence using hardware state machines to minimize active MCU time - enabling ultra-low average current consumption (<15 µA typical in periodic transmit mode). Its RF subsystem uses a PLL-based fractional-N synthesizer with external 26 MHz crystal (XI/XO pins) to generate stable 315 MHz or 434 MHz carrier frequencies.

Pressure and acceleration data are acquired via custom analog interfaces: the pressure sensor connects directly to internal SMI circuitry, while the optional XZ- or Z-axis accelerometer feeds into dedicated signal conditioning paths before ADC10 conversion. The LFA/LFB differential inputs provide robust 125 kHz LF wake-up detection for vehicle-side interrogation signals.

Key Specifications

Pinout & Package

FXTH87EH116T1 is housed in a 24-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is located at top-left when pressure port faces up; orientation matches Figure 3 in NXP FXTH87ERM Rev. 6.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tire pressure monitoring sensor applications.

Compared with SP370BTA, FXTH87EH116T1 delivers faster integration via monolithic pressure sensing and lower power in periodic transmit mode; compared with FXTH87116T1, it adds extended pressure range and XZ-axis accelerometer configurability - critical for commercial vehicle and ruggedized TPMS deployments.

Availability

FXTH87EH116T1 is available at Aetrix Electronics and suitable for automotive TPMS module manufacturing, commercial vehicle tire monitoring systems, and aftermarket sensor replacement programs requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned qualification evidence.

Supply support for FXTH87EH116T1 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 - with leadership in RF, sensor fusion, and automotive-grade microcontrollers.

FXTH87EH116T1 belongs to NXP's dedicated TPMS sensor family, designed specifically for direct-mount, battery-powered tire pressure monitoring in passenger and commercial vehicles - emphasizing ultra-low power, mechanical robustness, and regulatory compliance (FCC/IC/ETSI).

FAQ

What is the maximum pressure range supported by FXTH87EH116T1?

The FXTH87EH116T1 supports a factory-calibrated pressure range of 0 to 13.8 bar (0 to 200 psi), optimized for commercial vehicle and high-performance tire applications. This extended range is confirmed in NXP's FXTH87ERM Rev. 6.1 Section 2.2 and distinguishes FXTH87EH116T1 from variants like FXTH87116T1 (0–10 bar). Calibration data is stored in on-chip FLASH and applied automatically during measurement.

Does FXTH87EH116T1 include an integrated pressure sensor?

Yes, FXTH87EH116T1 integrates a MEMS-based pressure transducer directly into the package - no external sensor is required. As stated in Section 2.1 of the FXTH87ERM reference manual, it is a "fully integrated tire pressure monitoring sensor" with on-die pressure sensing, temperature compensation, and signal conditioning. This monolithic design eliminates interconnect drift and simplifies module assembly.

Can FXTH87EH116T1 operate with both XZ-axis and Z-axis accelerometer configurations?

FXTH87EH116T1 supports either XZ-axis or Z-axis accelerometer operation - selected at configuration time via internal fuse settings or firmware initialization. Section 2.2 of FXTH87ERM Rev. 6.1 specifies "Optional XZ- or Z-axis accelerometer with adjustable offset option", and Table 163 (Section 16.2.2) confirms CODE1 field bits control accelerometer type selection. Hardware supports both; only one is active per device configuration.

What RF frequency bands does FXTH87EH116T1 support?

FXTH87EH116T1 supports 315 MHz and 434 MHz ISM band operation using its internal PLL-based RF transmitter. Section 2.2 states "Internal 315-/434-MHz RF transmitter", and Figure 2 confirms the PLL/Fractional-N divider architecture driven by the external 26 MHz crystal (XI/XO). Frequency selection is controlled via register configuration - no hardware change required.

Is FXTH87EH116T1 pin-compatible with earlier FXTH87 series devices?

Yes, FXTH87EH116T1 maintains pin-for-pin electrical compatibility with FXTH87-based customer applications, as explicitly stated in Section 2.2 of FXTH87ERM Rev. 6.1. The QFN-24 package, pin functions (e.g., LFA/LFB, RF, XI/XO), and power domains (VDD/VSS, AVDD/AVSS, RFVSS) match prior generation devices - enabling drop-in replacement in existing PCB layouts without redesign.