Diodes Incorporated AP1117Y25L-13

Overview

AP1117Y25L-13 from Diodes Incorporated is a fixed-output 2.5V, 1A low-dropout linear regulator in SOT223 package, designed for stable voltage regulation in space-constrained applications requiring precise 2.5V supply-such as FPGA I/O banks, DDR memory termination, and industrial sensor signal conditioning. It guarantees ≤1.4V dropout at full load, operates from 4V to 18V input, and maintains ±2% output accuracy over temperature and load.

For engineers reviewing the AP1117Y25L-13 datasheet, AP1117Y25L-13 pinout, AP1117Y25L-13 application, or AP1117Y25L-13 equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown behavior, output capacitor ESR requirements (≤0.5Ω), and SOT223 thermal resistance (θJA = 107°C/W on standard FR-4).

Technical Context

The AP1117Y25L-13 integrates a precision bandgap reference (1.25V typ), error amplifier, and PNP pass transistor in a single SOT223 package. Its internal current limiting and thermal shutdown circuitry activate at ≥150°C junction temperature and ≥1.1A output current, ensuring safe operation under overload or ambient heating.

It supports both ceramic (X7R, ≥4.7µF) and tantalum (≥4.7µF) output capacitors with strict ESR limits (0.15–0.5Ω); unlike legacy 1117 variants, it is explicitly characterized and stable with MLCCs-eliminating need for parallel electrolytic bulk capacitance in most designs.

Key Specifications

Pinout & Package

SOT223 package with exposed thermal tab electrically connected to VOUT; requires minimum 5mm × 5mm 2oz copper pad for thermal performance (θJA = 107°C/W per datasheet test condition).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117K25G-13, the Y25L-13 offers lower cost and sufficient thermal margin for commercial environments; versus LD1117S25TR, it delivers superior noise rejection and tighter output tolerance-making it optimal for signal integrity–sensitive 2.5V domains.

Availability

AP1117Y25L-13 is available at Aetrix Electronics and suitable for PC peripheral design, VGA card refurbishment, industrial sensor modules, and FPGA-based control systems requiring stable component supply with lead-free compliance and SOT223 thermal performance.

Supply support for AP1117Y25L-13 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-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP1117 series targets cost-sensitive, space-constrained applications needing robust fixed-voltage regulation-designed specifically to replace legacy 1117 regulators with improved thermal performance, MLCC compatibility, and tighter DC accuracy.

FAQ

Can AP1117Y25L-13 be used with 10µF X5R ceramic capacitors?

Yes-datasheet explicitly validates stability with ≥4.7µF X7R or X5R MLCCs (ESR 0.15–0.5Ω). X5R is acceptable if rated for ≥6.3V and derated to ≥80% of nominal capacitance at DC bias; avoid Y5V due to severe capacitance loss under bias.

What is the minimum input voltage required for regulation at full 1A load?

Minimum input is VOUT + dropout = 2.5V + 1.4V = 3.9V. However, datasheet specifies 4.0V minimum for 2.5V output testing-designers should maintain ≥4.1V to ensure margin across temperature and unit variation.

Does the thermal tab require solder connection to PCB ground plane?

No-the tab is electrically connected to VOUT, not GND. It must be soldered to a dedicated 5mm × 5mm 2oz copper thermal pad tied to the 2.5V net; connecting it to GND creates a short and destroys the device.

How does load regulation change at –20°C ambient?

At –20°C, load regulation degrades to ±25mV (vs. ±20mV at 25°C) for 0–1A load steps-verified in datasheet Table "Load Regulation" for AP1117-2.5. This remains within 1% of nominal 2.5V output, preserving logic compatibility.