Diodes Incorporated AP1086D18L-13

Overview

AP1086D18L-13 from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering a precise 1.8V output with ≤1.4V dropout at full load, 1.764–1.836V output tolerance at 10mA, and 15mV load regulation across 0–1.5A. It operates from 3.3V to 12V input and is thermally protected with internal current limiting-designed for stable 1.8V supply in VGA cards and high-speed bus termination circuits.

For engineers reviewing the AP1086D18L-13 datasheet, AP1086D18L-13 pinout, AP1086D18L-13 application, or AP1086D18L-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1.5A, thermal resistance of 101°C/W (TO252-3L), fixed 1.8V output accuracy, and compatibility with ≥10µF aluminum/tantalum output capacitance for stability.

Technical Context

The AP1086D18L-13 implements a single-stage NPN pass transistor architecture with internal 1.25V reference and error amplifier, enabling fast transient response to load steps up to 1.5A. Its fixed-output configuration eliminates external resistor networks, reducing layout sensitivity and component count versus adjustable variants.

Thermal shutdown activates at 150°C junction temperature, and current limiting engages at ≥1.6A when VIN–VOUT = 5V. Stability is ensured only with ≥10µF output capacitance-typically aluminum or tantalum-with ESR < 1Ω, as phase margin depends on capacitor impedance characteristics.

Key Specifications

Pinout & Package

AP1086D18L-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal pad connected internally to VOUT. The tab is electrically tied to Pin 2 (VOUT), requiring PCB copper area for thermal conduction and electrical connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1086K18L-13, the D18L-13 offers lower cost and smaller footprint but higher thermal resistance; versus TLV1117-18CDCYR, it delivers 50% more current and 0.2V lower dropout-critical for margin-constrained 3.3V-input systems.

Availability

AP1086D18L-13 is available at Aetrix Electronics and suitable for VGA graphics cards, industrial FPGA I/O supplies, and high-speed bus termination circuits requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP1086D18L-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 consumer markets.

The AP1086 series belongs to Diodes' precision LDO regulator product line, engineered specifically for low-noise, high-current 1.25–5.0V fixed and adjustable voltage regulation in space-constrained, thermally demanding applications.

FAQ

What is the minimum input voltage required for AP1086D18L-13 to regulate at 1.8V?

The device requires VIN ≥ VOUT + 1.4V to maintain regulation under full 1.5A load, so minimum input is 3.2V. At lighter loads, dropout decreases-e.g., 1.3V typical at 1A-allowing operation down to ~3.1V with margin. Input must remain ≥3.3V per recommended operating conditions to ensure guaranteed performance across temperature.

Can AP1086D18L-13 be used without an output capacitor?

No. A minimum 10µF aluminum or tantalum capacitor is mandatory between VOUT and ground for stability and transient response. Omitting it causes oscillation or unregulated output. Ceramic capacitors alone are insufficient due to low ESR; if used, add a 1Ω damping resistor in series or pair with ≥10µF electrolytic.

Is the thermal pad of the TO252-3L package electrically isolated?

No-the tab is internally connected to Pin 2 (VOUT). It must be soldered to a PCB copper pour tied to the 1.8V output net for both thermal conduction and electrical integrity. Floating or grounding the tab creates a short circuit and will destroy the device.

How does load regulation impact system timing margins in FPGA designs?

With 15mV load regulation over 0–1.5A, the AP1086D18L-13 holds output within ±0.83% of 1.8V-well within typical FPGA I/O voltage tolerance (±3%). This prevents setup/hold time violations during rapid current draw from multiple I/O banks switching simultaneously.