Diodes Incorporated AP1084KL-13

Overview

AP1084KL-13 from Diodes Incorporated is a 5A low-dropout positive voltage regulator in TO263-3L package, configurable as adjustable or fixed-output (3.3V) device, with 1.4V max dropout at full load, ±1.5% output voltage accuracy, and integrated thermal shutdown - used for high-speed bus termination and 3.3V logic supply in VGA cards and embedded power rails.

For engineers reviewing the AP1084KL-13 datasheet, AP1084KL-13 pinout, AP1084KL-13 application, or AP1084KL-13 equivalent, this page delivers verified electrical specs, thermal resistance (θJC = 3.5°C/W), fixed-mode output configuration, stability requirements (≥10µF output capacitor), and real-world design constraints including minimum load current (10mA) and junction temperature limits (150°C).

Technical Context

The AP1084KL-13 operates as a fixed 3.3V output LDO regulator with internal 1.25V reference and precision error amplifier. Its dropout voltage remains ≤1.4V across 0–5A load current and input voltages from 4.8V to 12V, enabling stable regulation from 5V or 12V sources into low-voltage ICs.

It integrates current limiting (5.1A typical), thermal shutdown (150°C trip), and fast transient response optimized for digital load steps - supported by output capacitance ≥10µF (ESR 0.15–20Ω) and layout-sensitive feedback path routing to minimize load regulation error.

Key Specifications

Pinout & Package

AP1084KL-13 uses TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed metal tab electrically connected to VOUT for low-impedance heat transfer and reduced thermal resistance (θJC = 3.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1084KT-13, the KL-13 offers superior thermal performance (θJC = 3.5°C/W vs. 3.5°C/W but lower θJA) and SMT compatibility; versus LD1085V33, it provides 67% higher current capacity and tighter load regulation for demanding digital loads.

Availability

AP1084KL-13 is available at Aetrix Electronics and suitable for VGA graphics card power, industrial bus termination, embedded system core logic, and low-power FPGA I/O bank designs requiring stable component supply with RoHS-compliant, lead-free packaging.

Supply support for AP1084KL-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP1084 product line delivers high-current, low-dropout linear regulators targeting high-speed digital systems requiring precise, low-noise 1.5V–5.0V rails with robust thermal and overload protection.

FAQ

What is the maximum input voltage for AP1084KL-13?

The absolute maximum DC supply voltage is 12V. Operation above this level risks permanent damage. For reliable 3.3V output, input must be ≥4.8V (to maintain 1.4V dropout margin) and ≤12V per Absolute Maximum Ratings. Derating is recommended above 10V to manage power dissipation.

Can AP1084KL-13 be used in adjustable mode?

No - the "KL" suffix indicates TO263-3L package with fixed 3.3V output. Adjustable versions use no suffix (e.g., AP1084KL) or different VOUT codes (e.g., AP1084K25L-13 for 2.5V). The KL-13 variant has internal feedback network configured for 3.3V only.

Is an input capacitor required for AP1084KL-13?

Yes - a minimum 10µF aluminum or tantalum capacitor is recommended between VIN and GND to prevent input voltage sag during load transients. This ensures the input stays ≥1.4V above VOUT, maintaining regulation during 0–5A current steps.

How does the thermal shutdown behave in AP1084KL-13?

Thermal shutdown activates at 150°C junction temperature, disabling output until junction cools to ~135°C (typical hysteresis). It is not latch-off - automatic recovery occurs once temperature falls sufficiently. Continuous operation near this threshold indicates inadequate heatsinking or excessive power dissipation.