Diodes Incorporated AP1086K33G-13

Overview

AP1086K33G-13 from Diodes Incorporated is a 3-terminal, fixed-output 3.3V low dropout (LDO) linear regulator delivering up to 1.5A output current with ≤1.4V dropout at full load, designed for high-speed bus termination and low-current 3.3V logic supply in VGA cards and embedded systems.

For engineers reviewing the AP1086K33G-13 datasheet, AP1086K33G-13 pinout, AP1086K33G-13 application, or AP1086K33G-13 equivalent, key selection criteria include guaranteed 3.3V ±1.95% output tolerance at 10mA, 26–33mV load regulation over 0–1.5A, thermal shutdown protection, and TO263-3L package compatibility with PCB heat-sinking requirements.

Technical Context

The AP1086K33G-13 integrates a precision 1.25V reference, error amplifier, and PNP pass transistor in a fixed 3.3V configuration-no external resistors required. Its architecture ensures fast transient response to load steps up to 1.5A, supported by internal compensation requiring only a minimum 10µF output capacitor.

Thermal protection activates at 150°C junction temperature, and current limiting engages above 1.6A. The device operates across 4.8V–12V input range while maintaining regulation, with θ_JA = 83°C/W (TO263-3L, no heatsink, no airflow) and θ_JC = 0.65°C/W (control circuitry) / 2.7°C/W (power transistor).

Key Specifications

Pinout & Package

AP1086K33G-13 uses the TO263-3L (D2PAK) thermally enhanced surface-mount package with exposed tab electrically connected to V_OUT, enabling direct PCB copper pour for efficient heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117K33G-13 and TLV1117-33CKC, the AP1086K33G-13 uniquely delivers 1.5A continuous current in TO263-3L with guaranteed 1.4V dropout-making it the sole option for high-current 3.3V rails where thermal margin and load headroom are critical.

Availability

AP1086K33G-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PCIe bus termination, industrial PLC I/O modules, and embedded ARM peripheral supply requiring stable component supply and long-term production continuity.

Supply support for AP1086K33G-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.

The AP1086 product line targets high-current, low-dropout linear regulation for legacy and mixed-voltage embedded systems-designed specifically to replace older 78xx regulators while meeting modern efficiency, thermal, and noise requirements.

FAQ

What is the minimum input voltage required for AP1086K33G-13 to regulate at 3.3V?

The AP1086K33G-13 requires a minimum input voltage of 4.7V to maintain regulation at 3.3V output under full 1.5A load, based on its guaranteed 1.4V maximum dropout voltage. At lighter loads, input can drop to 4.8V per datasheet operating condition table, but 4.7V provides design margin for worst-case temperature and tolerance drift.

Can AP1086K33G-13 be used without an output capacitor?

No. The AP1086K33G-13 requires a minimum 10µF aluminum electrolytic or tantalum capacitor from V_OUT to GND for stability and transient response. Omitting it causes oscillation and potential device failure. Datasheet recommends 100µF for optimal performance in 3.3V fixed-mode applications like VGA cards.

Is the tab on AP1086K33G-13 electrically connected, and to which pin?

Yes-the exposed metal tab on the TO263-3L package is electrically connected to Pin 2 (V_OUT). This allows direct thermal coupling to a PCB copper pour while simultaneously serving as the primary output current path, improving both thermal performance and electrical reliability.

Does AP1086K33G-13 support adjustable output configurations?

No. The AP1086K33G-13 is factory-masked for fixed 3.3V output only. Adjustable versions use part numbers ending in "-ADJ" (e.g., AP1086KADJG-13) and require external resistors between Adj and GND. This variant has no adjustment terminal; Pin 1 is internally grounded.