AP7343Q-18W5-7

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

The AP7343Q-18W5-7 is an automotive-compliant low dropout regulator manufactured by Diodes Incorporated. It provides a fixed 1.8V output with a guaranteed current capability of 300mA. The device operates within an input voltage range of 1.7V to 5.25V and supports junction temperatures from -40°C to +125°C. Key electrical specifications include a quiescent current of 35µA, ripple rejection of 75dB at 1kHz, and output noise of 60µVrms. It utilizes SOT25-5 packaging.

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

• Automotive compliant design qualified to AEC-Q100 standards for reliability in vehicle environments
• Integrated enable pin allows precise control over regulator activation and shutdown states
• High power supply rejection ratio ensures stable operation in electrically noisy circuits
• Low output noise characteristics support sensitive analog and RF signal processing

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

• Infotainment power supplies
• Automotive RF supplies
• Camera modules
• Automotive POL in ADAS
• Automotive wireless communications

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

Verify the specific suffix W5 corresponds to the SOT25 package configuration required for your PCB layout. Confirm that the non-discharge variant meets system requirements, as discharge versions carry a different suffix. Ensure compliance with RoHS directives and check for PPAP documentation availability if mandated by your automotive supply chain protocols.

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

Select this component when a fixed 1.8V rail is needed with high PSRR for noise-sensitive loads. The SOT25 package offers a compact footprint suitable for dense layouts. Consider the non-discharge feature if external pull-down resistors are undesirable during shutdown. Verify thermal dissipation capabilities based on the expected voltage drop and load current.

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

This part belongs to the AP7343Q family of LDOs designed specifically for automotive applications. It shares core electrical performance with standard variants but adheres to stricter quality and change control processes. The series includes multiple output voltages and package options to accommodate diverse system architectures.

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

AP7343DQ-18W5-7 (includes internal discharge resistor)

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

Does the AP7343Q-18W5-7 include an internal discharge resistor?

No, the 'Q' designation without 'D' indicates this version does not have an internal auto-discharge resistor. The output voltage will remain floating or decay slowly depending on the load when disabled.

What is the minimum input voltage required for proper regulation?

The minimum operating input voltage is 1.7V. However, to maintain regulation, the input must exceed the output voltage plus the dropout voltage, which varies with load current.