STMicroelectronics LY503ALH

Overview

LY503ALH from STMicroelectronics is a single-axis MEMS yaw-rate gyroscope delivering analog angular-rate output with ±30 °/s full-scale range, 140 Hz bandwidth, and 33.3 mV/°/s sensitivity on the 4x amplified output. It operates from 2.7 V to 3.6 V across –40 °C to +85 °C and is used in camera image stabilization and motion-controlled UIs.

For engineers reviewing the LY503ALH datasheet, LY503ALH pinout, LY503ALH application, or LY503ALH equivalent, key selection criteria include its dual-output architecture (amplified/non-amplified), embedded self-test and power-down functions, temperature-stable zero-rate level (±0.01 °/s/°C drift), and LGA-16 package compatibility with high-shock environments.

Technical Context

The LY503ALH integrates a micromachined Coriolis-sensing element with a CMOS interface IC that provides two independent analog outputs: OUTZ (±120 °/s, 8.3 mV/°/s) and 4xOUTZ (±30 °/s, 33.3 mV/°/s). Its internal PLL synchronizes driving and sensing phases, while embedded low-pass filtering sets a fixed 140 Hz –3 dB bandwidth.

Digital control pins-ST (self-test enable), PD (power-down), and HP (high-pass filter reset)-interface directly to logic-level signals (0.2×Vdd / 0.8×Vdd thresholds). The device uses external RC networks on FILTVDD and VCONT pins to configure PLL loop stability, and requires Vref (1.23 V) as a stable reference for output centering.

Key Specifications

Pinout & Package

LY503ALH is housed in a 5 mm × 5 mm × 1.5 mm plastic land grid array (LGA-16) package with bottom-side solder pads and no exposed leads. The package supports automated reflow and meets JEDEC J-STD-020C for moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-axis analog gyroscope applications.

Compared with ADXRS645 and LPY510AL, LY503ALH uniquely balances consumer-grade power efficiency (5.5 mA), integrated diagnostics (ST/PD/HP pins), and dual analog output scaling-making it optimal for battery-powered image stabilization and gesture UI where analog interface simplicity and thermal stability are critical.

Availability

LY503ALH is available at Aetrix Electronics and suitable for image stabilization in digital cameras, motion-controlled user interfaces in mobile devices, and dead-reckoning assistance in GPS navigation systems requiring stable component supply and long-term manufacturability.

Supply support for LY503ALH 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, with manufacturing and R&D facilities across Europe, Asia, and the Americas.

LY503ALH belongs to ST's high-stability analog MEMS gyroscope product line, designed specifically for consumer electronics demanding low-power, high-reliability motion sensing in compact form factors.

FAQ

What is the purpose of the HP pin on LY503ALH?

The HP (High Pass Filter Reset) pin is an active-high logic input that resets the external high-pass filter capacitor. Applying logic high clears DC offset buildup, ensuring fast settling after power-on or overload events. It is recommended to assert HP briefly at startup to guarantee stable baseline output within milliseconds.

Can LY503ALH operate from a 2.5 V supply?

No. LY503ALH is specified for 2.7 V to 3.6 V operation only. At 2.5 V, internal PLL and amplifier biasing fall outside guaranteed operating conditions, resulting in degraded bandwidth, increased zero-rate drift, and potential failure of self-test functionality per datasheet Section 2.3 absolute maximum ratings.

How does the self-test function verify sensor integrity?

The ST pin activates an on-chip electrostatic force that displaces the micromachined driving mass, simulating a known Coriolis response. When enabled, the output shifts by a predictable DC voltage (e.g., ~1.0 V on 4xOUTZ at 3 V supply), confirming both mechanical mobility and analog signal chain functionality without external motion equipment.

Why are pins 4, 5, and 6 labeled "Res" and left unconnected?

Pins 4, 5, and 6 are reserved for factory test and calibration and have no internal connection in final production units. Leaving them unconnected avoids unintended parasitic coupling or ESD paths. Connecting them risks disrupting internal bias networks or triggering undefined behavior per datasheet Table 2 pin description.