Diodes Incorporated AP1117K50L-13

Overview

AP1117K50L-13 from Diodes Incorporated is a 1A low-dropout linear regulator with fixed 5.0V output, TO263-3 package, 1.4V max dropout at 1A, ±2% output voltage accuracy, and integrated thermal shutdown and current limiting. It delivers stable 5V supply for PC peripherals, communication modules, and consumer equipment requiring robust regulation under 6.5–12V input.

For engineers reviewing the AP1117K50L-13 datasheet, AP1117K50L-13 pinout, AP1117K50L-13 application, or AP1117K50L-13 equivalent, key selection criteria include dropout voltage at full load, thermal resistance (θJC = 3.5°C/W), output capacitor ESR tolerance (≤0.5Ω), and industrial-grade junction temperature range (−40°C to +125°C).

Technical Context

The AP1117K50L-13 uses an internal bandgap reference (1.25V) and error amplifier to maintain fixed 5.0V output across 0–1A load. Its dropout behavior is characterized at ΔVOUT = 1% VOUT, with guaranteed ≤1.4V at 1A and TJ ≤ +125°C.

Thermal protection activates at ~150°C junction temperature, cycling output off/on during overtemperature events. The device requires ≥4.7µF ceramic (X7R) or solid tantalum output capacitor with ESR ≤0.5Ω for stability-compatible with MLCCs but not Y5V dielectrics.

Key Specifications

Pinout & Package

AP1117K50L-13 is housed in a TO263-3 (D²PAK) surface-mount package with exposed thermal tab (VOUT-connected) for enhanced heat dissipation. Pin 1 = VIN, Pin 2 = VOUT, Pin 3 = Adj/GND (internally tied to GND for fixed-output variants).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD1117S50TR and TLV1117-50CDR, AP1117K50L-13 offers superior thermal performance (θJC = 3.5°C/W), full 1A current delivery with built-in thermal cycling, and TO263 packaging optimized for high-power density layouts - making it the preferred choice for industrial and embedded systems demanding continuous 5V/1A operation.

Availability

AP1117K50L-13 is available at Aetrix Electronics and suitable for PC peripheral design, communication module integration, and consumer equipment manufacturing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP1117K50L-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and protection devices.

The AP1117 series belongs to Diodes' high-reliability LDO regulator product line, engineered for industrial and computing applications demanding wide-input-range, low-dropout, and thermally robust fixed/flexible voltage regulation.

FAQ

What is the minimum input voltage required for AP1117K50L-13 to regulate 5.0V output?

The device requires VIN ≥ VOUT + dropout voltage. At 1A load, maximum dropout is 1.4V, so minimum input is 6.4V. Datasheet specifies 6.5V min for 5.0V operation to ensure margin across temperature and process variation. Below this, output drops out of regulation.

Can AP1117K50L-13 be used with ceramic output capacitors?

Yes - it is explicitly qualified for MLCCs (X7R dielectric, ≥4.7µF). Unlike older 1117 variants, AP1117 supports low-ESR ceramics without oscillation. Avoid Y5V due to capacitance drift; ensure ESR stays ≤0.5Ω per datasheet stability requirements.

Does AP1117K50L-13 include reverse polarity protection?

No - the device lacks internal reverse-voltage protection. Applying reversed input voltage (e.g., −0.3V on VIN) exceeds absolute maximum rating and may cause permanent damage. External series diode or MOSFET protection is required in systems with potential reverse-bias conditions.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C, the regulator disables output and enters thermal cycle mode: output remains off until die cools to ~135°C, then resumes regulation. This hysteresis prevents rapid on/off toggling and provides self-recovery without manual reset - critical for unattended industrial deployments.