Diodes Incorporated AP1086D25L-U

Overview

AP1086D25L-U from Diodes Incorporated is a 1.5A low-dropout linear regulator in fixed 2.5V output mode, housed in a TO252-3L surface-mount package. It delivers stable regulation with ≤1.4V dropout at full load, supports 4.0–12V input range, and requires only a 10µF output capacitor for stability-targeted for VGA card power rails and low-current 3.3V/2.5V logic supplies.

For engineers reviewing the AP1086D25L-U datasheet, AP1086D25L-U pinout, AP1086D25L-U application, or AP1086D25L-U equivalent, key selection factors include guaranteed 2.5V ±1.0% output tolerance at 10mA–1.5A, fast transient response under 100µs load steps, thermal shutdown protection, and compatibility with standard PCB thermal pad layouts for TO252-3L.

Technical Context

The AP1086D25L-U implements a fixed-output LDO architecture with internal voltage reference (1.25V), error amplifier, and PNP pass transistor. Its dropout behavior is characterized by ≤1.4V across 0–1.5A load at TJ = 25°C, degrading to ≤1.5V at TJ = 125°C per typical curves.

Stability relies on ≥10µF aluminum electrolytic or tantalum output capacitance with ESR between 0.1Ω and 1Ω. Line regulation is specified at ≤0.2% over VIN = VOUT+1.5V to 12V; load regulation is ≤25mV from 0 to 1.5A at VIN = 4V.

Key Specifications

Pinout & Package

AP1086D25L-U uses the TO252-3L (DPAK) thermally enhanced surface-mount package. The exposed tab is electrically connected to VOUT and must be soldered to a ≥1.5cm² PCB copper area for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117D25L-U and TLV1117-25CDCYR, the AP1086D25L-U uniquely supports 1.5A continuous load in TO252-3L with 1.4V dropout-enabling direct replacement of obsolete 2.5V regulators in legacy VGA and industrial imaging platforms without redesigning thermal layout.

Availability

AP1086D25L-U is available at Aetrix Electronics and suitable for VGA graphics card manufacturing, FPGA-based industrial controllers, and CMOS image sensor interface designs requiring stable component supply and long-term obsolescence management.

Supply support for AP1086D25L-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The AP1086 series belongs to Diodes' high-current LDO portfolio, engineered specifically for legacy computing and graphics applications where low dropout, tight tolerance, and thermal robustness are required under constrained board space.

FAQ

What is the minimum input voltage required for AP1086D25L-U to regulate at 2.5V?

The AP1086D25L-U requires VIN ≥ VOUT + dropout voltage. With max dropout of 1.4V at 1.5A, minimum input is 3.9V. However, datasheet specifies 4.0V as absolute minimum operating input to ensure regulation across temperature and load extremes-including 125°C junction and 1.5A step load.

Can AP1086D25L-U be used in adjustable mode?

No. AP1086D25L-U is factory-masked for fixed 2.5V output. Pin 1 (Adj/GND) is internally connected to ground and cannot be reconfigured. For adjustable operation, select AP1086DXXL-U with "Adj" suffix and external R1/R2 divider per the datasheet's adjustable circuit diagram.

Is a heat sink required for 1.5A operation?

A dedicated heat sink is not required if PCB thermal design meets specifications: ≥1.5cm² of 2oz copper connected to the VOUT tab, with ≥100mm² total thermal pad area. At 25°C ambient and 1.5A load with 4.5V input, junction temperature rises ~152°C-exceeding 150°C limit-so ≥1cm² additional copper or forced airflow is mandatory for continuous operation.

Does AP1086D25L-U support reverse polarity protection?

No. The device lacks internal reverse-battery or reverse-voltage protection. Applying reversed input voltage may damage the internal PNP pass transistor and reference circuitry. External protection-such as a series Schottky diode or ideal diode controller-is required in systems prone to accidental reverse connection.