Diodes Incorporated AP7375-50W5-7

Overview

AP7375-50W5-7 from Diodes Incorporated is a 5.0V fixed-output, wide-input (3–45V), 300mA ultra-low-dropout linear regulator in SOT25 package with 2.1μA quiescent current, integrated enable pin rated to 45V, and ±2% output accuracy-designed for battery-powered smoke detectors requiring stable low-power rail generation under wide input transients.

For engineers reviewing the AP7375-50W5-7 datasheet, AP7375-50W5-7 pinout, AP7375-50W5-7 application, or AP7375-50W5-7 equivalent, key selection criteria include dropout voltage at 100mA (350mV typ.), thermal shutdown threshold (+150°C), PSRR (85dB @ 1kHz), and EN pin compatibility with high-side 45V logic control without level shifting.

Technical Context

The AP7375-50W5-7 employs a PMOS pass transistor architecture enabling true low-dropout operation down to 35mV at 10mA load and maintaining regulation across 3V–45V input range. Its internal bandgap reference and error amplifier deliver ±2% output accuracy over temperature and line/load variations.

Fast transient response is achieved via optimized internal compensation-ensuring no overshoot during startup or short-circuit recovery-and integrated protection includes current limiting (500mA typ.) and thermal shutdown with 20°C hysteresis, eliminating external supervision circuitry in space-constrained designs.

Key Specifications

Pinout & Package

SOT25 (Package Code: W5) is a 5-pin surface-mount package with exposed thermal pad (EP), offering 153°C/W junction-to-ambient thermal resistance and optimized PCB copper area for heat dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1703T-5002E/MB and TN8205-5.0, AP7375-50W5-7 uniquely combines 45V input/enable capability, 2.1μA quiescent current, and fully autonomous thermal/current protection-making it the sole option for long-life, high-voltage, self-protected 5V regulation in space-constrained SOT25 layouts.

Availability

AP7375-50W5-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, microcontroller applications, and home appliances requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AP7375-50W5-7 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

Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and automotive markets.

The AP7375 series belongs to Diodes' high-reliability LDO portfolio, engineered specifically for wide-input, ultra-low-power applications where extended battery life, robust transient immunity, and integrated protection are mandatory design requirements.

FAQ

What is the minimum input voltage required for AP7375-50W5-7 to regulate 5.0V output?

The AP7375-50W5-7 requires VIN ≥ VOUT + VDROP(MAX). With 350mV typical dropout at 100mA, minimum input is 5.35V under that load. At lighter loads (10mA), dropout drops to 35mV, allowing regulation from 5.035V. Below 3V, the device ceases regulation entirely per absolute maximum ratings.

Can the EN pin be left floating, or does it require a pull-down resistor?

The EN pin must not be left floating. It has no internal pull-down; an unconnected EN may float to indeterminate voltage, causing erratic output enable/disable behavior. A 100kΩ pull-down to GND ensures reliable disable state during power-up and guarantees turn-on only when actively driven above 1V.

Is the exposed pad (EP) on the SOT25 package electrically connected to any internal node?

No-the exposed pad is thermally isolated and not connected to any internal circuit node. It serves solely as a thermal conduction path to the PCB. Diodes Incorporated explicitly states it should not be used as a GND electrode; instead, it must be soldered to a dedicated thermal copper pour connected to GND for optimal heat dissipation.

Does AP7375-50W5-7 support ceramic output capacitors with X5R dielectric?

Yes-X5R and X7R ceramic capacitors are explicitly recommended in the datasheet for COUT. A minimum 1μF X5R/X7R capacitor is required for stability, and values up to 10μF or higher improve load transient response. Avoid Y5V or Z5U types due to capacitance loss under DC bias and temperature.