Diodes Incorporated AP1086T15G-U

Overview

AP1086T15G-U from Diodes Incorporated is a fixed-output 1.5V, 1.5A low dropout linear regulator in TO220-3L package with 1.4V max dropout at full load, ±1% output voltage tolerance at 10mA, and integrated thermal shutdown. It delivers stable 1.5V supply for FPGA core logic, DDR memory termination, and low-voltage microcontroller I/O rails from 3V–12V input.

For engineers reviewing the AP1086T15G-U datasheet, AP1086T15G-U pinout, AP1086T15G-U application, or AP1086T15G-U equivalent, key selection factors include dropout voltage under 1.5A load, thermal resistance (θ_JA = 86°C/W), output stability with ≥10µF capacitor, and fixed 1.5V output without external resistor network.

Technical Context

The AP1086T15G-U implements a PNP-based LDO architecture with internal 1.25V reference and current-limit protection. Its feedback loop is factory-trimmed for 1.5V output, eliminating external resistors and reducing layout sensitivity to trace inductance.

Thermal shutdown activates at 150°C junction temperature, and the device maintains regulation down to 1.4V VIN–VOUT differential across 0–125°C operating range. Load regulation is specified at ≤15mV over 0–1.5A output current at 3V input.

Key Specifications

Pinout & Package

AP1086T15G-U uses TO220-3L package with exposed tab electrically connected to VOUT. The tab serves as primary heat path and must be soldered to a copper pour for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1086K15G-13, the AP1086T15G-U offers lower assembly cost and through-hole mechanical robustness; versus LD1086DT15TR, it provides tighter initial tolerance (±1% vs ±2%) and lower minimum load requirement for battery-backed standby modes.

Availability

AP1086T15G-U is available at Aetrix Electronics and suitable for FPGA power delivery, DDR termination, and low-voltage microcontroller I/O rails requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AP1086T15G-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 devices for industrial, computing, and consumer markets.

The AP1086 series belongs to Diodes' precision LDO portfolio, engineered for high-current, low-noise regulation in space- and thermally-constrained logic supply applications where fixed output simplifies design and improves reliability.

FAQ

Is AP1086T15G-U adjustable or fixed-output?

AP1086T15G-U is a fixed-output 1.5V regulator. Its "T" package code and "15" suffix indicate TO220-3L packaging and factory-trimmed 1.5V output. Unlike the adjustable AP1086-Adj variant, it requires no external resistors and ties Pin 1 directly to ground.

What is the minimum input voltage required for regulation?

The minimum input voltage is VOUT + dropout voltage = 1.5V + 1.4V = 2.9V at full 1.5A load. At lighter loads, dropout decreases; at 10mA, dropout is typically <0.5V, allowing operation from ~2.0V input while maintaining regulation.

Can AP1086T15G-U be used without a heatsink?

Yes, but only at reduced load. With θ_JA = 86°C/W and 150°C max junction temperature, maximum safe power dissipation without heatsink is (150 – 70)°C ÷ 86°C/W ≈ 0.93W - corresponding to ~0.62A at 1.5V drop (VIN = 3.0V). For 1.5A operation, a heatsink is mandatory.

What output capacitor value and type are required for stability?

A minimum 10µF aluminum or tantalum capacitor is required between VOUT and GND, placed within 5mm of the pins. For optimal transient response in FPGA/DDR applications, Diodes recommends 100µF with ESR <100mΩ - verified in the datasheet's typical application circuits.