Diodes Incorporated AP1086D33G-13

Overview

AP1086D33G-13 from Diodes Incorporated is a fixed-output 3.3V, 1.5A low dropout linear regulator in TO252-3L package with 1.4V max dropout at full load, ±1% output voltage tolerance, and integrated thermal shutdown. It delivers stable power for high-speed bus termination, 3.3V logic supplies, and VGA card applications requiring tight regulation under fast load transients.

For engineers reviewing the AP1086D33G-13 datasheet, AP1086D33G-13 pinout, AP1086D33G-13 application, or AP1086D33G-13 equivalent, key selection criteria include dropout voltage at 1.5A, load regulation ≤33mV across 0–1.5A, thermal resistance (θ_JA = 101°C/W), minimum 10µF output capacitance requirement, and fixed 3.3V output configuration without external resistors.

Technical Context

The AP1086D33G-13 implements a PNP-based LDO architecture with internal reference (1.25V), error amplifier, and pass transistor-enabling regulation with only 1.4V input-to-output differential. Its feedback network is factory-trimmed for 3.3V output, eliminating external resistors and reducing layout sensitivity.

It features built-in current limiting (1.6A min), thermal shutdown activation at 150°C junction temperature, and 70dB ripple rejection at 120Hz with 25µF tantalum output capacitor. Stability is guaranteed with ≥10µF aluminum electrolytic or equivalent ESR output capacitance.

Key Specifications

Pinout & Package

AP1086D33G-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal pad connected internally to V_OUT. The package measures 6.58mm × 9.70mm × 2.25mm and requires a recommended land pattern per Diodes Inc. AP02001 for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117D33G-13 and TLV1117-33CDCYR, AP1086D33G-13 uniquely supports continuous 1.5A loads with 1.4V dropout and 70dB noise suppression-making it the only option among the three qualified for high-current, noise-sensitive 3.3V applications without external current boosting.

Availability

AP1086D33G-13 is available at Aetrix Electronics and suitable for high-speed bus termination, VGA graphics card power, and embedded 3.3V logic supply applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for AP1086D33G-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 point-of-load regulation in demanding digital systems such as graphics cards and high-speed interface modules.

FAQ

What is the minimum input voltage required for AP1086D33G-13 to regulate at full 1.5A load?

The device requires VIN ≥ VOUT + 1.4V = 4.7V to maintain regulation at 1.5A. Below this differential, output voltage drops linearly with input; operation below 4.7V is unsupported and may cause undervoltage lockout or thermal stress due to excessive power dissipation in the pass element.

Can AP1086D33G-13 be used with ceramic output capacitors?

Yes, but only if the ceramic capacitor has ≥15mΩ effective series resistance (ESR) or is paralleled with a low-ESR aluminum or tantalum capacitor. The regulator's internal compensation relies on output capacitor ESR for phase margin; pure low-ESR ceramics (<5mΩ) risk instability and oscillation.

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

No-the exposed thermal pad is internally connected to the V_OUT terminal. It must be soldered to a dedicated PCB copper pour tied to the 3.3V output net, not to ground or any other potential, to ensure proper thermal conduction and avoid short circuits.

Does AP1086D33G-13 require an input capacitor?

While not strictly mandatory for stability, a minimum 100µF aluminum electrolytic or 47µF tantalum input capacitor is strongly recommended to prevent VIN sag during load transients. Without it, input droop below 4.7V can trigger dropout and cause output collapse during 1.5A current steps.