Diodes Incorporated AP1086T50G-U

Overview

AP1086T50G-U from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering a precise 5.0V output with ≤1.4V dropout at full load, 3.3mV load regulation at 1.5A, and 70dB ripple rejection at 120Hz-designed for stable 3.3V/5.0V logic supplies on VGA cards and high-speed bus termination circuits.

For engineers reviewing the AP1086T50G-U datasheet, AP1086T50G-U pinout, AP1086T50G-U application, or AP1086T50G-U equivalent, key selection criteria include guaranteed 1.4V max dropout at 1.5A, thermal shutdown protection, TO220-3L package thermal resistance (θ_JA = 86°C/W), and compatibility with ≥10µF aluminum electrolytic output capacitance for stability.

Technical Context

The AP1086T50G-U implements a fixed-output LDO architecture using an internal 1.25V reference and precision resistor divider, enabling tight initial output tolerance (±1%) across 0–125°C junction temperature. Its control loop delivers fast transient response to 0–1.5A load steps with <±40mV deviation and maintains regulation down to 1.4V VIN–VOUT differential.

Thermal protection activates at 150°C junction temperature, and current limiting holds output at ~1.6A under short-circuit conditions. The device requires no external compensation beyond a minimum 10µF output capacitor and operates within 3.3V–12V input range for 5.0V output.

Key Specifications

Pinout & Package

AP1086T50G-U uses the TO220-3L package with exposed tab electrically connected to V_OUT, providing low thermal resistance (θ_JC = 0.65/2.7°C/W for control/power sections) and mechanical mounting capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940CT-5.0/NOPB and TLV1117-50CDCYR, AP1086T50G-U uniquely supports 1.5A continuous output in TO220-3L with 1.4V dropout - making it the only option among the three capable of driving high-current bus terminations without derating.

Availability

AP1086T50G-U is available at Aetrix Electronics and suitable for VGA graphics card power, industrial bus termination, and embedded system logic supply requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP1086T50G-U 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 AP1086 product line delivers high-current, low-dropout fixed and adjustable regulators optimized for cost-sensitive, thermally constrained applications such as graphics cards and bus interface modules.

FAQ

What is the minimum input voltage required for AP1086T50G-U to regulate 5.0V output?

The AP1086T50G-U requires a minimum input voltage of 6.5V to maintain 5.0V regulation at full 1.5A load, based on its 1.4V maximum dropout specification. Input voltage must exceed V_OUT + 1.4V across all operating temperatures and load conditions to avoid dropout mode.

Can AP1086T50G-U be used in adjustable mode?

No - AP1086T50G-U is a fixed 5.0V output variant. Its "Adj/GND" pin is internally connected to ground and cannot be reconfigured for adjustable operation. Only AP1086-ADJ variants (e.g., AP1086TADJG-U) support external resistor programming of output voltage.

What output capacitor value and type are required for stability?

A minimum 10µF aluminum electrolytic capacitor is required between V_OUT and GND for stability. Tantalum or low-ESR polymer capacitors may also be used; ceramic capacitors alone are insufficient due to ESR requirements specified in the datasheet for phase margin control.

Does AP1086T50G-U include reverse polarity protection?

No - AP1086T50G-U lacks integrated reverse-polarity protection. Applying reverse voltage to VIN or VOUT can cause permanent damage. External protection diodes or MOSFET-based circuits must be added if system-level reverse-input risk exists.