Diodes Incorporated AP1086K25G-13

Overview

AP1086K25G-13 from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering a precise 2.5V output with ≤1.4V dropout at full load, ±1% initial tolerance, and 10μF minimum output capacitance requirement. It operates from 4V to 12V input and is used in VGA cards, high-speed bus termination, and 3.3V/2.5V logic supply rails.

For engineers reviewing the AP1086K25G-13 datasheet, AP1086K25G-13 pinout, AP1086K25G-13 application, or AP1086K25G-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1.5A, thermal shutdown protection, TO263-3L package thermal resistance (θJC = 0.65°C/W for control circuitry), and guaranteed load regulation of ≤25mV across 0–1.5A.

Technical Context

The AP1086K25G-13 integrates a precision 1.25V reference, error amplifier, and PNP pass transistor in a fixed-output configuration. Its feedback network is internal, eliminating external resistors and reducing layout sensitivity.

It features fast transient response due to optimized internal compensation and requires only a single 10μF output capacitor for stability-no ESR constraints. Thermal shutdown activates at 150°C junction temperature, and current limiting holds output at ~1.6A during overload.

Key Specifications

Pinout & Package

AP1086K25G-13 uses the TO263-3L surface-mount package with exposed metal tab electrically connected to VOUT for enhanced thermal performance and PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1086D25G-13, the K-suffix TO263 variant offers superior thermal dissipation (83 vs. 101°C/W θJA); versus TLV1117-25CDCYR, AP1086K25G-13 delivers 50% higher current with identical 2.5V output but trades off tighter initial tolerance for robustness at full load.

Availability

AP1086K25G-13 is available at Aetrix Electronics and suitable for VGA graphics card power delivery, DDR SDRAM I/O supply, and industrial bus termination requiring stable component supply and long-term industrial lifecycle support.

Supply support for AP1086K25G-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 and computing markets.

The AP1086 product line delivers high-current, low-dropout fixed and adjustable regulators optimized for cost-sensitive, thermally demanding applications such as graphics subsystems and memory interfaces.

FAQ

What is the minimum input voltage required for AP1086K25G-13 to maintain regulation?

The device requires VIN ≥ VOUT + 1.4V to regulate properly. For its 2.5V output, minimum input is 3.9V under full 1.5A load. At lighter loads, dropout decreases - e.g., 1.3V typical at 1A - allowing operation down to ~3.8V. Input must also meet specified voltage ranges per output variant (4V–12V for 2.5V version).

Can AP1086K25G-13 be used in adjustable mode?

No. The 'K25' suffix denotes a factory-masked fixed 2.5V output. Pin 1 (Adj/GND) is internally connected to ground and cannot be reconfigured. Adjustable versions use 'Adj' marking (e.g., AP1086KADJG-13) with external resistor divider between VOUT, Adj, and GND.

Is an input capacitor required for stable operation?

While not strictly required for stability, a minimum 10μF aluminum or tantalum input capacitor is strongly recommended to limit VIN sag during load transients and reduce high-frequency noise coupling. Without it, line transient response degrades and may cause temporary regulation loss during rapid current steps.

How does the TO263-3L package's thermal design impact PCB layout?

The exposed VOUT tab must be soldered to a dedicated copper pour acting as a thermal plane. Diodes Inc. recommends ≥4 cm² of 2oz copper connected via ≥4 thermal vias (0.3mm diameter) to inner ground planes. Avoid routing signals under the tab and ensure solder mask opening matches pad dimensions exactly to maximize thermal conduction.