Diodes Incorporated AP1117D33L-13

Overview

AP1117D33L-13 from Diodes Incorporated is a 1A low-dropout linear voltage regulator in TO252 (DPAK) package, fixed 3.3V output, with ≤1.4V dropout at full load, ±1% output voltage accuracy, and built-in thermal shutdown and current limiting. It delivers stable 3.3V supply for high-speed bus termination, VGA card logic rails, and PC peripheral power domains.

For engineers reviewing the AP1117D33L-13 datasheet, AP1117D33L-13 pinout, AP1117D33L-13 application, or AP1117D33L-13 equivalent, key selection factors include dropout voltage at 1A load, thermal resistance (θJA = 73°C/W on 2oz FR-4), minimum 4.7µF MLCC output capacitance requirement, and industrial-grade alternatives for extended temperature operation.

Technical Context

The AP1117D33L-13 integrates a precision 1.25V bandgap reference, error amplifier, and PNP pass transistor in a fixed-output configuration. Its internal current-limit threshold is 1.1A and thermal shutdown activates at ~150°C junction temperature.

It operates across 4.8V to 12V input range while maintaining regulation at 3.3V output, with line regulation ≤0.2% and load regulation ≤33mV over 0–1A load. Ripple rejection is 60–70dB at 180Hz with 25µF tantalum output capacitor.

Key Specifications

Pinout & Package

AP1117D33L-13 uses the TO252-3 (DPAK) surface-mount package with exposed thermal tab connected to VOUT for enhanced heat dissipation. The package measures 6.10mm × 6.58mm × 2.29mm and features gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117D33L-13, the AP1117E33L-13 trades thermal performance for size, while AP1117ID33G-13 adds guaranteed -40°C startup and operation without altering electrical behavior-making it the drop-in upgrade for harsh environments.

Availability

AP1117D33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card logic supply, and industrial communication modules requiring stable component supply with commercial-temperature reliability and TO252 thermal performance.

Supply support for AP1117D33L-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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The AP1117 series belongs to Diodes' precision linear regulator product line, engineered for high-current, low-noise, and thermally robust local regulation in space- and cost-sensitive embedded systems.

FAQ

What is the minimum input voltage required for AP1117D33L-13 to regulate at full 1A load?

The device requires VIN ≥ VOUT + dropout voltage. With 1.4V max dropout at 1A, minimum input is 4.7V. At lower loads, dropout decreases-e.g., 1.2V at 800mA-allowing 4.5V input under partial load. Input must remain ≥1.3V above VOUT at all times to avoid dropout mode.

Can AP1117D33L-13 be used with ceramic capacitors, and what ESR range is acceptable?

Yes-AP1117D33L-13 is explicitly qualified for MLCCs. A minimum 4.7µF X7R ceramic capacitor is required, with ESR between 0.15Ω and 0.5Ω. Y5V dielectrics are prohibited due to capacitance drift; aluminum electrolytics require ≥47µF and benefit from a parallel 1µF MLCC.

How does thermal performance change if the TO252 thermal tab is not soldered to a copper plane?

Without thermal pad connection, θJA degrades from 73°C/W to >120°C/W. At 1A and 5V input, power dissipation is 1.7W-raising junction temperature by >200°C above ambient, triggering thermal shutdown. Full thermal performance requires ≥250mm² 2oz copper connected to the tab.

Is AP1117D33L-13 pin-compatible with other '1117-family regulators from different manufacturers?

Yes-AP1117D33L-13 follows industry-standard TO252-3 pinout (VIN-VOUT-GND) and matches electrical behavior of standard 1117 regulators. However, Diodes' version offers improved load regulation (±33mV vs. ±50mV typical) and lower thermal resistance, enabling higher sustained current in identical layouts.