Diodes Incorporated AP1117YL-13

Overview

AP1117YL-13 from Diodes Incorporated is a 1A low-dropout linear regulator in SOT89-3 package, configured for fixed 3.3V output. It delivers stable regulation with ≤1.4V dropout at full load, supports 4.8V–12V input range, and features built-in thermal shutdown and current limiting-designed for PC peripherals, VGA cards, and 3.3V logic supply rails.

For engineers reviewing the AP1117YL-13 datasheet, AP1117YL-13 pinout, AP1117YL-13 application, or AP1117YL-13 equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θJA = 164°C/W), output capacitor ESR requirements (<0.5Ω), adjustable vs. fixed version compatibility, and industrial-grade alternatives for extended temperature operation.

Technical Context

The AP1117YL-13 implements a bandgap-referenced error amplifier driving an NPN pass transistor, enabling precise 3.3V regulation across load currents up to 1A. Its internal 1.25V reference and fixed resistor network eliminate external feedback components.

Thermal protection activates at ~150°C junction temperature, disabling output until die cooling occurs. Dropout behavior is characterized at ΔVOUT = 1% VOUT, with guaranteed ≤1.4V at 1A and 0°C ≤ TJ ≤ +125°C-enabling reliable 3.3V generation from 4.8V inputs in space-constrained applications.

Key Specifications

Pinout & Package

SOT89-3 package with exposed thermal tab connected to VOUT; compact 4.5×2.5mm footprint ideal for space-limited consumer and peripheral boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117YL-13, the SOT223 variant offers superior thermal dissipation for continuous high-current use, while the TO252 industrial version adds temperature resilience and lower thermal resistance-making them non-drop-in but functionally aligned upgrades for specific mechanical or environmental demands.

Availability

AP1117YL-13 is available at Aetrix Electronics and suitable for PC peripheral design, VGA card refurbishment, and consumer set-top box production requiring stable component supply, consistent lead-free compliance, and long-term SOT89-3 package availability.

Supply support for AP1117YL-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 and consumer markets.

The AP1117 series belongs to Diodes' precision LDO portfolio, engineered specifically for cost-sensitive, space-constrained applications demanding robust thermal behavior and compatibility with modern ceramic capacitors.

FAQ

What is the minimum input voltage required for AP1117YL-13 to regulate 3.3V at 1A?

The AP1117YL-13 requires VIN ≥ VOUT + dropout voltage. At 1A and 25°C, dropout is ≤1.4V, so minimum input is 4.7V. The datasheet specifies 4.8V as the guaranteed minimum for full-load regulation across temperature, accounting for worst-case 1.4V dropout and tolerance margins.

Can AP1117YL-13 be used with 10µF X5R ceramic capacitors instead of tantalum?

Yes-AP1117YL-13 is explicitly qualified for MLCC use. The datasheet confirms stability with 4.7µF X7R ceramics (ESR ≤0.5Ω); X5R is acceptable if ESR remains within spec. Avoid Y5V due to capacitance drift. No additional compensation is needed.

Does AP1117YL-13 require an external resistor divider for 3.3V output?

No. The 'YL' suffix denotes fixed 3.3V output configuration. Pin 1 (Adj/GND) is internally connected to ground-no external resistors are required or permitted. Using it as adjustable would violate the fixed-mode design and cause regulation failure.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C, the regulator disables output and enters hiccup mode: output turns off until die cools to ~135°C, then resumes. This cycle repeats autonomously-preventing permanent damage but causing intermittent supply loss unless the root cause (e.g., insufficient copper area or excessive VIN-VOUT differential) is corrected.