Diodes Incorporated AP7387-50FDC-7

Overview

AP7387-50FDC-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. It delivers ±2% output voltage accuracy, 700mV dropout at 100mA, and 2μA quiescent current - optimized 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 AP7387-50FDC-7 datasheet, AP7387-50FDC-7 pinout, AP7387-50FDC-7 application, or AP7387-50FDC-7 equivalent, key selection criteria include its 60V max input rating, thermal shutdown at +150°C, PSRR of 70dB @ 1kHz, and compatibility with 10μF ceramic output capacitance for transient stability in safety-critical sensing nodes.

Technical Context

The AP7387-50FDC-7 integrates a precision voltage reference, error amplifier, current-limit circuit, thermal shutdown comparator, and short-circuit protection logic - all operating within a single monolithic silicon die. Its architecture enables fast line/load transient response due to high-gain error amplification and low-output-impedance pass element design.

It operates across -40°C to +125°C junction temperature with internal thermal hysteresis of +30°C and features an exposed pad (EP) internally tied to GND for enhanced thermal dissipation - critical for sustained 150mA operation in compact U-DFN2020-6 layouts.

Key Specifications

Pinout & Package

AP7387-50FDC-7 uses the U-DFN2020-6 (Type C) package - a 2.0mm × 2.0mm, 0.6mm height, thermally enhanced leadless package with exposed pad (EP) for PCB-level heat sinking. The EP must be soldered to a large GND copper area for optimal thermal performance (θ_JA = 48°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7387-50FDC-7, AP7361-50SA-7 trades output current and thermal capability for smaller footprint, while TPS7B8150QDGNRQ1 adds automotive qualification at the cost of input voltage headroom and PSRR - making AP7387-50FDC-7 uniquely suited for high-input, high-reliability industrial sensing.

Availability

AP7387-50FDC-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, EV and HEV battery management systems requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7387-50FDC-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 solutions for industrial, computing, consumer, and automotive markets.

The AP7387 product line targets high-input-voltage, ultra-low-power regulation in safety-critical and battery-constrained applications - emphasizing thermal robustness, wide VIN tolerance, and minimal quiescent consumption.

FAQ

What is the minimum input voltage required for AP7387-50FDC-7 to regulate 5.0V output?

The AP7387-50FDC-7 requires a minimum input voltage of 5.0V + V_DROP. At 100mA load, typical dropout is 700mV, so minimum VIN is 5.7V. At 150mA, it rises to 6.1V (5.0V + 1.1V). Below these thresholds, regulation is lost and VOUT drops linearly with VIN.

Can AP7387-50FDC-7 operate without an output capacitor?

No. An output capacitor is mandatory for stability - the datasheet specifies a minimum 10μF ceramic capacitor (X7R/X5R) placed within 2mm of VOUT and GND pins. Omitting it causes oscillation, excessive noise, and potential thermal runaway under load.

Is the exposed pad (EP) on AP7387-50FDC-7 electrically connected?

Yes - the EP is internally bonded to GND. It must be soldered to a dedicated GND copper pour on the PCB to achieve the specified θ_JA = 48°C/W and prevent thermal shutdown during 150mA operation. Leaving it unconnected degrades thermal performance by >100°C/W.

Does AP7387-50FDC-7 support reverse-polarity input protection?

No. The device lacks internal reverse-voltage protection. Applying negative voltage to VIN relative to GND violates Absolute Maximum Ratings (–0.3V min) and may cause permanent damage. External series diode or MOSFET-based protection must be added if reverse polarity is possible in the system.