Diodes Incorporated AP7375-50SA-7

Overview

AP7375-50SA-7 from Diodes Incorporated is a 5.0V fixed-output, wide-input (3–45V), 300mA ultra-low-dropout linear regulator in SOT23-3 package, featuring 2.1μA quiescent current, 35mV dropout at 10mA, and integrated enable pin rated to 45V. It delivers stable power to microcontrollers and battery-powered sensors with fast transient response and no overshoot during startup or short-circuit recovery.

For engineers reviewing the AP7375-50SA-7 datasheet, AP7375-50SA-7 pinout, AP7375-50SA-7 application, or AP7375-50SA-7 equivalent, key selection criteria include input voltage range up to 45V, EN pin compatibility with high-side control, ±2% output accuracy, thermal shutdown behavior, and SOT23-3 footprint constraints for space-constrained designs.

Technical Context

The AP7375-50SA-7 employs a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (85dB @ 1kHz), with internal compensation ensuring stability with 1μF–10μF ceramic output capacitors. Its EN pin accepts up to 45V logic-level input, decoupling control circuitry from input rail voltage.

Line regulation is 0.01%/V and load regulation is 0.02%/mA over 1–100mA, while thermal shutdown activates at +150°C with +20°C hysteresis. Short-circuit protection limits output current to ~500mA without external components.

Key Specifications

Pinout & Package

SOT23-3 package (Package Code: SA), 2.9mm × 1.3mm × 1.0mm body, with exposed pad not present in this variant. Thermal resistance θ_JA = 164°C/W on JEDEC-standard 2-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-5002E/MB and TPS7A2050PDBVR, the AP7375-50SA-7 uniquely combines 45V input capability, 45V-tolerant EN, and SOT23-3 footprint-enabling single-component solutions in high-voltage industrial and alarm systems where alternatives require supplemental circuitry or package redesign.

Availability

AP7375-50SA-7 is available at Aetrix Electronics and suitable for industrial control input modules, battery-powered smoke detectors, microcontroller-based data loggers, and home appliance display panels requiring stable component supply across extended temperature and voltage ranges.

Supply support for AP7375-50SA-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 devices, with design centers across Asia, Europe, and the US, serving industrial, computing, and consumer markets.

The AP7375 series belongs to Diodes' high-reliability LDO portfolio, engineered specifically for wide-input-voltage industrial and safety-critical applications where input rail variability, long-term stability, and fault resilience are mandatory.

FAQ

What is the minimum input voltage required for regulation at 5.0V output?

The AP7375-50SA-7 requires VIN ≥ VOUT + V_DROP, with typical dropout of 35mV at 10mA and 350mV at 100mA. Thus, minimum functional VIN is 5.035V at light load and 5.35V at full 300mA load. Below these, output voltage drops linearly with input.

Can the EN pin be left floating, or must it be pulled high/low?

The EN pin must not be left floating. Internal pull-down is not provided. To ensure reliable operation, tie EN to VIN via a resistor divider or directly to a logic source. Floating EN may cause erratic enable/disable behavior due to noise coupling, risking unintended shutdown or power-on.

Does AP7375-50SA-7 require an external output capacitor, and what type is recommended?

Yes - a minimum 1μF ceramic capacitor (X5R or X7R dielectric) is required between VOUT and GND for stability. Diodes recommends 10μF for optimal transient response. Place it within 3mm of VOUT/GND pins using short, wide traces; tantalum or electrolytic capacitors are not recommended due to ESR and reliability concerns.

How does thermal shutdown behave during overload, and does it auto-recover?

When junction temperature reaches +150°C, the AP7375-50SA-7 shuts down the pass element and holds VOUT at 0V. After thermal dissipation reduces junction temperature by ≥20°C (hysteresis), the device automatically resumes regulation without external intervention - no reset pin or power cycle is needed.