Diodes Incorporated AP7387-50W5-7

Overview

AP7387-50W5-7 from Diodes Incorporated is a 5.0V fixed-output, wide-input (5–60V), 150mA ultra-low-dropout linear regulator in SOT25 package, featuring 700mV dropout at 100mA, 2μA quiescent current, ±2% output accuracy, and 70dB PSRR at 1kHz-designed for battery-powered smoke detectors and EV battery management systems where high input voltage tolerance and low standby power are critical.

For engineers reviewing the AP7387-50W5-7 datasheet, AP7387-50W5-7 pinout, AP7387-50W5-7 application, or AP7387-50W5-7 equivalent, key selection considerations include dropout behavior under 150mA load, thermal resistance (θ_JA = 150°C/W for SOT25), fast line/load transient response, and compatibility with 1μF input / 10μF ceramic output capacitors per layout guidelines.

Technical Context

The AP7387-50W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, thermal shutdown, and short-circuit protection in a single monolithic IC. Its architecture delivers stable 5.0V regulation across 5–60V input while maintaining 2μA quiescent current-enabling multi-year operation in battery-backed sensors.

It employs internal MOSFET pass element with fast transient compensation, achieving <200μs recovery time during 10–150mA load steps and <5μs response to 5.3–12V input transients. The SOT25 package provides θ_JA = 150°C/W and θ_JC = 59.5°C/W, supporting continuous 150mA output at ambient ≤+85°C with minimal PCB copper area.

Key Specifications

Pinout & Package

SOT25 package: 5-pin surface-mount plastic package with exposed thermal pad (EP), 3.0mm × 2.8mm footprint, 1.6mm height, and matte tin-plated leads compliant with J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-quiescent-current, wide-input LDO applications.

Compared with AP7387-50W5-7, AP7361-50SA-7 trades output current and thermal performance for smaller footprint, while TPS7B8750QKVURQ1 adds automotive qualification at the cost of 14× higher quiescent current-making AP7387-50W5-7 optimal for cost-sensitive, long-life industrial and consumer battery systems.

Availability

AP7387-50W5-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and EV/HEV battery management systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7387-50W5-7 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 company specializing in discrete, analog, and mixed-signal devices for industrial, computing, consumer, and automotive markets.

The AP7387 product line delivers ultra-low-I_Q, wide-input LDOs optimized for energy-constrained, high-reliability applications such as battery-backed safety sensors and electric vehicle subsystems.

FAQ

What is the minimum input voltage required for AP7387-50W5-7 to regulate 5.0V at 150mA?

The typical dropout voltage is 1100mV at 150mA, so minimum input voltage is 5.0V + 1.1V = 6.1V. The absolute minimum specified input is 5.0V, but regulation cannot be guaranteed below 6.1V under full load due to dropout constraints.

Can AP7387-50W5-7 operate with ceramic output capacitors smaller than 10μF?

No-the datasheet specifies a minimum 10μF ceramic output capacitor (X7R/X5R) for stability. Using less capacitance risks oscillation, poor transient response, and potential thermal runaway under dynamic load conditions.

Is the exposed pad (EP) on the SOT25 package electrically connected internally?

Yes-the EP is internally connected to GND. It must be soldered to a dedicated GND copper pour on the PCB to achieve the rated θ_JA = 150°C/W and prevent thermal throttling at 150mA output.

Does AP7387-50W5-7 require an input capacitor, and what value is recommended?

Yes-a 1μF ceramic capacitor is required between VIN and GND, placed as close as possible to the device. This decouples high-frequency noise and prevents instability; larger values improve noise immunity but are not mandatory.