S-19514AY1A-V9T1U4

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The S-19514AY1A-V9T1U4 is an automotive-grade linear regulator featuring a built-in window watchdog timer and reset function. It provides a fixed 3.3 V output with ±2.0% accuracy across the -40°C to +125°C temperature range. The device supports up to 250 mA output current and withstands input voltages from 3.0 V to 36.0 V, including 45 V load dump conditions. Key electrical parameters include a typical dropout voltage of 120 mV at 100 mA, 65 dB ripple rejection at 100 Hz, and 3.0 μA typical quiescent current during watchdog deactivation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrates a window watchdog timer with autonomous operation capability based on load current detection.
• Includes a voltage detection circuit that monitors output voltage and triggers a reset signal upon undervoltage.
• Features adjustable release delay time and watchdog trigger time via external capacitors connected to the DLY pin.
• Provides comprehensive protection through built-in overcurrent limiting and thermal shutdown circuits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Constant-voltage power supply for automotive electric components
• Microcontroller monitoring in vehicle equipment

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix V9T1U4 corresponds to the TO-252-9S package and tape reel packing format. Confirm AEC-Q100 qualification status directly with ABLIC sales representatives as detailed reliability specifications are not fully listed in public datasheets. Ensure compliance with RoHS and halogen-free requirements before finalizing procurement orders.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when high-withstand voltage input (up to 36 V) and integrated system supervision are required. The S-19514 variant specifically includes a WEN pin for enabling or disabling the watchdog function, offering greater control flexibility compared to the S-19515 series. Ensure external capacitors meet ESR and capacitance requirements to prevent oscillation and ensure stable phase compensation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the S-19514/19515 Series developed using high-withstand voltage CMOS technology. It is designed for safety-critical automotive applications requiring reliable power management and system monitoring. The series is qualified under AEC-Q100 standards, ensuring suitability for use in demanding vehicular environments where long-term reliability is paramount.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Public confirmed substitute part numbers: S-19514AY2A-V9T1U4, S-19514AY3A-V9T1U4, S-19515AY1A-V9T1U4, S-19515AY2A-V9T1U4, S-19515AY3A-V9T1U4.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How is the watchdog timer activation threshold current adjusted?

The watchdog activation threshold current can be adjusted by connecting an external resistor between the WADJ pin and the VSS pin. If the WADJ pin is left open, the default activation current is approximately 1.5 mA.

What is the difference between the S-19514 and S-19515 series?

The S-19514 series includes a WEN (Watchdog Enable) pin, allowing the user to enable or disable the watchdog function. The S-19515 series does not have a WEN pin, meaning the watchdog function is always active.