Diodes Incorporated AP1117D25L-13

Overview

AP1117D25L-13 from Diodes Incorporated is a 1A low-dropout linear voltage regulator with fixed 2.5V output, TO252-3L (DPAK) package, 1.4V max dropout at full load, ±2% output voltage accuracy, and integrated thermal shutdown and current limiting. It delivers stable 2.5V power for logic supplies in PC peripherals and communication modules operating from 4–12V input.

For engineers reviewing the AP1117D25L-13 datasheet, AP1117D25L-13 pinout, AP1117D25L-13 application, or AP1117D25L-13 equivalent, key selection criteria include dropout voltage under 1A load, thermal resistance (θ_JA = 73°C/W), minimum load current requirement (5–10mA), and compatibility with 10µF/22µF tantalum or ceramic output capacitors.

Technical Context

The AP1117D25L-13 uses an internal NPN pass transistor with feedback-controlled reference voltage (1.25V nominal) to maintain regulation across input voltages from 4V to 18V. Its architecture supports fast transient response due to low output impedance and built-in compensation.

It operates exclusively in fixed-output mode (2.5V), eliminating external resistor networks. Thermal shutdown activates at ~150°C junction temperature, and current limiting engages at ≥1.1A to protect against short-circuit conditions without external components.

Key Specifications

Pinout & Package

AP1117D25L-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal tab connected to V_OUT for enhanced heat dissipation. The tab must be soldered to a thermal pad per Diodes Inc. AP02001 layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117E25L-13, the D25L-13 offers superior thermal management in compact DPAK form; versus MIC29302-2.5WT, it trades current capacity and dropout for smaller size, lower cost, and lower no-load consumption-ideal for 1A, cost-sensitive commercial designs.

Availability

AP1117D25L-13 is available at Aetrix Electronics and suitable for PC peripheral power, communication module supply, VGA card logic supply, and low-current 3.3V system bias applications requiring stable component supply, consistent lead-free compliance, and commercial-temperature grade reliability.

Supply support for AP1117D25L-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 was designed as a cost-optimized, pin-compatible family of 1A LDOs targeting mainstream commercial applications including PC peripherals, communication infrastructure, and graphics subsystems-emphasizing ease of use, thermal robustness, and RoHS compliance.

FAQ

What is the minimum input voltage required for AP1117D25L-13 to regulate at full 1A load?

The device requires VIN ≥ VOUT + dropout = 2.5V + 1.4V = 3.9V minimum. At exactly 3.9V input, output remains regulated at 2.5V under 1A load per datasheet Section 5 (Electrical Characteristics). Below this, output collapses linearly with input.

Can AP1117D25L-13 operate without an output capacitor?

No. A minimum 10µF capacitor (ESR 0.15–20Ω) is mandatory between VOUT and GND for stability, as specified in Pin Descriptions (Page 3). Omitting it causes oscillation or thermal runaway under load, per design validation in Typical Performance Characteristics (Page 6).

Is AP1117D25L-13 compatible with ceramic output capacitors?

Yes-ceramic capacitors are acceptable if ESR falls within 0.15–20Ω. Many X5R/X7R 10µF ceramics meet this range; verify ESR at 100kHz in manufacturer datasheets. Avoid ultra-low-ESR types (<0.1Ω) unless compensated per Application Note AP02001.

Does the thermal tab of AP1117D25L-13 require electrical isolation from PCB ground?

No-the tab is internally connected to VOUT (Pin 2), not GND. It must be soldered to a dedicated copper pour tied to the 2.5V net for thermal conduction. Isolating it degrades θ_JA by >20°C/W and risks thermal shutdown during sustained 1A operation.