Diodes Incorporated AP1086D50L-13

Overview

AP1086D50L-13 from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering a precise 5.0V output with ≤1.4V dropout at full load, ±1% initial tolerance, and 60–70dB ripple rejection at 120Hz. It operates from 6.5–12V input and supports high-speed bus termination and 3.3V/5.0V logic supply in VGA cards and embedded power rails.

For engineers reviewing the AP1086D50L-13 datasheet, AP1086D50L-13 pinout, AP1086D50L-13 application, or AP1086D50L-13 equivalent, key selection factors include guaranteed 1.4V max dropout at 1.5A, thermal shutdown protection, TO252-3L surface-mount package with exposed VOUT tab, and stability with ≥10µF output capacitance.

Technical Context

The AP1086D50L-13 integrates a precision 1.25V reference, error amplifier, current-limiting circuitry, and thermal shutdown into a monolithic PMOS pass transistor architecture. Its fixed 5.0V output is laser-trimmed during manufacturing, eliminating external resistors required in adjustable variants.

It achieves fast transient response via internal frequency compensation optimized for ≥10µF aluminum/tantalum output capacitors and maintains regulation under input sags down to VIN = VOUT + 1.4V - enabling efficient operation from 6.5V input to deliver stable 5.0V at up to 1.5A.

Key Specifications

Pinout & Package

AP1086D50L-13 uses the TO252-3L (DPAK) thermally enhanced surface-mount package with an exposed metal tab electrically connected to VOUT for improved heat dissipation and PCB copper area utilization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1086K50L-13, the D50L-13 offers smaller PCB area and lower component height but requires more careful thermal layout; versus MIC29501-5.0WT, it delivers identical 5V regulation at lower cost and quiescent power, though with less headroom for future current scaling.

Availability

AP1086D50L-13 is available at Aetrix Electronics and suitable for VGA graphics card power, industrial I/O module supply, and embedded system core logic rails requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP1086D50L-13 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, computing, and automotive markets.

The AP1086 series belongs to Diodes' precision LDO regulator product line, engineered specifically for low-noise, high-current point-of-load regulation in space-constrained applications such as graphics cards and embedded controllers.

FAQ

Can AP1086D50L-13 be used with ceramic output capacitors?

No - the AP1086D50L-13 requires ≥10µF aluminum or tantalum output capacitance with ESR between 0.1Ω and 1Ω for stability. Ceramic capacitors typically have ESR < 10mΩ and will cause oscillation unless a series resistor (0.1–1Ω) is added, which degrades transient response and defeats the purpose of low-ESR ceramics.

What is the minimum input voltage required for regulation at 1.5A load?

The minimum input voltage is 6.4V: V_IN(MIN) = V_OUT + V_DROP(MAX) = 5.0V + 1.4V. Below this, the device enters dropout and output voltage drops linearly with input; operation below 6.5V is not guaranteed per datasheet specifications.

Is the exposed tab on AP1086D50L-13 electrically isolated?

No - the TO252-3L tab is internally connected to the VOUT pin. It must be soldered directly to a PCB copper pour designated as the 5V output net, not to ground or any other potential. Isolating the tab breaks the thermal path and risks thermal shutdown during sustained 1.5A operation.

Does AP1086D50L-13 require an input capacitor?

Yes - a minimum 100µF aluminum or tantalum input capacitor is required close to the VIN pin to prevent input voltage sag during 1.5A load transients. Without it, the device may lose regulation momentarily, causing system resets or data corruption in downstream logic.