Diodes Incorporated AP1086T25G-U

Overview

AP1086T25G-U from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering 2.5V output with ≤1.4V dropout at full load, ±1% output voltage tolerance at 10mA, and 60–70dB ripple rejection at 120Hz. It operates from 4V to 12V input and supports high-speed bus termination and low-current 3.3V/2.5V logic supplies in VGA cards and embedded power rails.

For engineers reviewing the AP1086T25G-U datasheet, AP1086T25G-U pinout, AP1086T25G-U application, or AP1086T25G-U equivalent, key selection criteria include guaranteed 1.4V max dropout at 1.5A, thermal shutdown protection, TO220-3L package thermal resistance (θJA = 86°C/W), and fixed 2.5V output accuracy across 0°C to 125°C junction temperature.

Technical Context

The AP1086T25G-U implements a single-stage NPN pass transistor architecture with internal 1.25V reference and error amplifier feedback loop, enabling stable regulation with only 10µF minimum output capacitance. Its fast transient response handles 0–1.5A load steps while maintaining <±33mV load regulation at 3.3V output.

Thermal shutdown activates at 150°C junction temperature, and current limiting is fixed at ≥1.6A under 5V VIN–VOUT differential. The device requires no external compensation and achieves 0.003% RMS output noise (10Hz–10kHz) for noise-sensitive analog supply domains.

Key Specifications

Pinout & Package

AP1086T25G-U uses the TO220-3L package with exposed tab electrically connected to VOUT for enhanced thermal conduction. Mounting requires isolation from chassis ground unless VOUT is system ground-referenced.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1086T25G-U, the AP1086T25L-U offers identical electrical performance with reduced environmental compliance scope, while LM2940CT-2.5/NOPB trades tighter regulation and higher current capability for broader vendor availability and legacy design continuity - neither is pin-compatible without trace modification.

Availability

AP1086T25G-U is available at Aetrix Electronics and suitable for industrial PLC modules, medical sensor signal chains, FPGA I/O power, and VGA graphics card designs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP1086T25G-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 Philippines.

The AP1086 product line targets cost-sensitive, high-reliability linear regulation needs in computing, industrial, and consumer electronics - emphasizing low dropout, thermal robustness, and simplified bill-of-materials through integrated protection features.

FAQ

What is the minimum input voltage required for AP1086T25G-U to maintain regulation?

The AP1086T25G-U requires VIN ≥ VOUT + 1.4V at full 1.5A load, so minimum input is 3.9V. At lighter loads, dropout decreases - e.g., 1.2V at 500mA - but design must guarantee ≥3.9V under worst-case load and temperature conditions to avoid regulation loss.

Can AP1086T25G-U be used in adjustable mode?

No. AP1086T25G-U is a fixed 2.5V output variant. The "T25" suffix denotes factory-masked 2.5V configuration; the Adj pin is internally grounded and not accessible for external resistor programming. Use AP1086TADJ-U for adjustable operation.

Is a heatsink mandatory for continuous 1.5A operation?

Yes. With θJA = 86°C/W and 1.5A @ 2.5V output from 5V input (2.5V × 1.5A = 3.75W dissipation), junction temperature rise exceeds 322°C without heatsinking - far above the 150°C absolute maximum. A 10°C/W heatsink reduces rise to ~45°C, enabling safe continuous operation at 25°C ambient.

What output capacitor type and value is required for stability?

A minimum 10µF aluminum electrolytic or tantalum capacitor is required between VOUT and GND, placed within 5mm of the pins. For optimal transient response and ripple suppression, use 100µF low-ESR tantalum as shown in the typical application circuit - ceramic capacitors alone are insufficient due to lack of ESR for phase compensation.