Diodes Incorporated AP7387-50FDCR-7

Overview

AP7387-50FDCR-7 from Diodes Incorporated is a 5.0V fixed-output, wide-input (5–60V), 150mA ultra-low-dropout linear regulator in U-DFN2020-6 (Type C) package with 700mV dropout at 100mA, 2μA quiescent current, and 70dB PSRR at 1kHz-designed for battery-powered smoke detectors and EV battery management systems where input voltage varies widely and standby power must be minimized.

For engineers reviewing the AP7387-50FDCR-7 datasheet, AP7387-50FDCR-7 pinout, AP7387-50FDCR-7 application, or AP7387-50FDCR-7 equivalent, key selection criteria include dropout behavior under 150mA load, thermal resistance (θ_JA = 48°C/W), ±2% output accuracy, fast line/load transient response, and compatibility with 10μF ceramic output capacitance in space-constrained PCB layouts.

Technical Context

The AP7387-50FDCR-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 and 70dB PSRR at 1kHz-enabling operation in high-noise automotive and industrial environments.

It employs internal MOSFET pass element with thermal foldback and current limiting (250mA typical), supporting rapid recovery from line/load transients without external compensation. The U-DFN2020-6 (Type C) package features an exposed pad internally tied to GND, requiring PCB copper area connection for thermal dissipation and low-impedance grounding.

Key Specifications

Pinout & Package

AP7387-50FDCR-7 is housed in a 2.0mm × 2.0mm U-DFN2020-6 (Type C) package with wettable flank leads and an exposed thermal pad (EP) internally connected to GND. The package supports reflow soldering per J-STD-020 Level 1 and requires PCB copper area under EP for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B8750QKVURQ1, AP7387-50FDCR-7 offers 13× lower quiescent current and 50% wider input range but lacks AEC-Q100 certification; versus MCP1703T-5002E/MB, it provides 60V operation and superior thermal performance in DFN packaging, enabling higher ambient reliability in sealed enclosures.

Availability

AP7387-50FDCR-7 is available at Aetrix Electronics and suitable for battery-powered equipment, EV battery management systems, and home appliance control boards requiring stable component supply with long-term lifecycle support and RoHS-compliant sourcing.

Supply support for AP7387-50FDCR-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

The AP7387 series belongs to Diodes' ultra-low-I_Q wide-input LDO product line, engineered specifically for energy-constrained and high-voltage environments such as battery-backed safety systems and electric vehicle subsystems.

FAQ

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

The AP7387-50FDCR-7 maintains regulation down to VIN = VOUT + VDROP. With 700mV typical dropout at 100mA, the minimum functional input is 5.7V. At full 150mA load, dropout rises to 1100mV (typ.), requiring ≥6.1V input. Below 5V, the device enters undervoltage lockout and disables output.

Can the NC pins (3 and 4) be left floating on the U-DFN2020-6 package?

No-pins 3 and 4 are not internally connected but must be soldered to GND on the PCB. This practice maximizes thermal conduction through the package body, improves EMI immunity, and stabilizes ground reference for the error amplifier. Leaving them floating degrades thermal performance and may cause instability under heavy load.

Is an input capacitor mandatory, and what type is recommended?

Yes-a 1μF ceramic capacitor (X7R or X5R dielectric) is mandatory between VIN and GND, placed within 2mm of the pins. It suppresses high-frequency noise and prevents oscillation during fast input transients. Larger values (e.g., 10μF) improve immunity but are not required for basic stability per the datasheet's recommended operating conditions.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches +150°C, the AP7387-50FDCR-7 disables the pass transistor and forces VOUT to 0V. After shutdown, it remains off until temperature drops by ≥30°C (hysteresis), then automatically resumes regulation. This cycle repeats during continuous overload, preventing permanent damage but limiting average output power in poorly heatsinked layouts.