Diodes Incorporated AP1084T50G-U

Overview

AP1084T50G-U from Diodes Incorporated is a 5A low-dropout linear regulator in TO220-3L package, fixed 5.0V output, with 1.4V maximum dropout at full load, thermal shutdown, and current limiting. It delivers stable 5V/5A power for high-speed bus termination, VGA card supplies, and low-current 3.3V logic systems requiring tight regulation under fast transients.

For engineers reviewing the AP1084T50G-U datasheet, AP1084T50G-U pinout, AP1084T50G-U application, or AP1084T50G-U equivalent, key selection factors include guaranteed 1.4V dropout at 5A, ±1% load regulation (50mV max), 1.25V internal reference, thermal shutdown at 150°C, and compatibility with 10µF–100µF output capacitors meeting ESR 0.15–20Ω.

Technical Context

The AP1084T50G-U implements a three-terminal adjustable/fixed LDO architecture with a precision 1.25V bandgap reference and internal current-limiting circuitry. Its dropout voltage remains ≤1.4V across 0–5A load and junction temperatures from 0°C to 125°C, enabling efficient regulation from 6.5V–12V inputs down to 5.0V output.

It features fast transient response due to optimized internal compensation and requires only a single 10µF minimum output capacitor (ESR 0.15–20Ω) for stability. The device uses a thermally enhanced TO220-3L package with tab-connected VOUT and junction-to-ambient thermal resistance of 78°C/W under standard PCB mounting conditions.

Key Specifications

Pinout & Package

AP1084T50G-U uses the TO220-3L package with exposed thermal tab electrically connected to VOUT. Mounting requires isolation from heatsink unless VOUT is chassis-ground referenced. Pin 1 (Adj/GND) is ground in fixed-mode; Pin 2 (VOUT) is output and thermal tab; Pin 3 (VIN) is input.

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 TLV1117-50, AP1084T50G-U uniquely combines 5A output, 1.4V dropout, integrated thermal/current protection, and TO220 thermal performance-making it the only viable choice for high-current 5V LDO applications demanding reliability and efficiency.

Availability

AP1084T50G-U is available at Aetrix Electronics and suitable for high-speed bus termination, VGA graphics card power, and industrial PLC I/O modules requiring stable component supply with long lifecycle visibility and RoHS compliance.

Supply support for AP1084T50G-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 high-performance power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP1084 product line targets high-current, low-dropout linear regulation for legacy and cost-sensitive embedded systems where simplicity, reliability, and thermal robustness outweigh switching noise concerns.

FAQ

What is the minimum input voltage required for AP1084T50G-U to regulate 5.0V at 5A?

The AP1084T50G-U requires a minimum input voltage of 6.4V to maintain regulation at full 5A load, based on its guaranteed maximum dropout voltage of 1.4V. Input voltages below this threshold will cause output collapse or unregulated behavior, especially under transient load steps.

Can AP1084T50G-U be used in adjustable-output configuration?

No - AP1084T50G-U is factory-configured as a fixed 5.0V output device. The "50" suffix denotes fixed 5.0V mode, and Pin 1 (Adj/GND) is internally connected to ground. For adjustable operation, select AP1084T-ADJ variants (e.g., AP1084T-U) with no voltage suffix.

What output capacitor value and ESR range ensure stability?

A minimum 10µF aluminum or tantalum capacitor with ESR between 0.15Ω and 20Ω is required for stability. Typical designs use 100µF/6.3V electrolytic capacitors. Ceramic capacitors alone are not recommended due to insufficient ESR; a parallel RC network may be needed if using low-ESR ceramics.

Is AP1084T50G-U suitable for automotive applications?

AP1084T50G-U is not AEC-Q100 qualified and lacks automotive-grade screening or extended temperature range (−40°C to +125°C junction is supported, but qualification data is absent). It is intended for industrial and commercial applications; automotive use requires formal qualification and validation per OEM requirements.