S-19503AY3A-V9T1U4

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

The S-19503AY3A-V9T1U4 is a positive fixed-output low-dropout (LDO) voltage regulator manufactured by ABLIC Inc. It belongs to the S-19503 series, designed for automotive applications with an input voltage range up to 36V and a maximum output current of 400mA. The device provides a fixed 3.3V output in a TO-252-9S surface-mount package. Key electrical characteristics include a typical power supply rejection ratio (PSRR) of 70dB at 100Hz and a dropout voltage of 240mV at full load. It operates within a temperature range of -40°C to +125°C.

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

• Integrated windowed watchdog timer (WDT) for system monitoring
• Built-in reset circuit with delay time control
• High input voltage tolerance up to 36V
• Automotive-grade reliability compliant with AEC-Q100

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

• Automotive electronic control units (ECUs)
• Infotainment systems requiring stable 3.3V logic supplies
• Body electronics modules
• Sensor interface circuits in harsh thermal environments

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

Verify the specific suffix codes against the official ABLIC datasheet to ensure correct output voltage, package type, and feature set. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability may vary. Ensure the ordering quantity matches the reel packaging requirements specified in the procurement documentation.

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

Select this component when a 3.3V rail is required with high noise immunity and integrated system protection. The 400mA output capability suits moderate load applications. Verify that the 36V input rating aligns with the system's supply voltage, including transient spikes. The TO-252-9S package offers adequate thermal dissipation for continuous operation in confined automotive spaces.

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

This part is part of the S-19500 series of automotive LDO regulators featuring integrated watchdog timers and reset functions. It complements other variants like the S-19502 and S-19504, differing primarily in output current capacity and specific internal timing parameters. The series targets robust power management in vehicles where space and reliability are critical constraints.

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

Direct substitutes include S-19502AY3A-V9T1U4 (400mA, different PSRR/dropout specs) and S-19504AY3A-V9T1U4 (250mA). Verify pin compatibility and thermal performance before substitution. Cross-reference with S-19515 series if higher current or different package is needed.