Diodes Incorporated AP1117D50G-13

Overview

AP1117D50G-13 from Diodes Incorporated is a 1A low-dropout linear voltage regulator with fixed 5.0V output, TO252 (DPAK) 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, VGA cards, and 3.3V logic bus termination under 6.4–18V input.

For engineers reviewing the AP1117D50G-13 datasheet, AP1117D50G-13 pinout, AP1117D50G-13 application, or AP1117D50G-13 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with documented functional trade-offs.

Technical Context

The AP1117D50G-13 uses an internal bandgap reference (1.25V) and error amplifier to regulate output against load and line variations. Its dropout voltage remains ≤1.4V at full 1A load across 0°C to +125°C junction temperature, enabling operation with only 6.4V input for 5V output.

It features fast transient response due to optimized internal compensation and supports MLCC output capacitors (≥4.7µF, X7R, ESR <0.5Ω). Thermal shutdown activates at ~150°C junction temperature, and current limiting protects against short-circuit conditions.

Key Specifications

Pinout & Package

AP1117D50G-13 uses the TO252-3 (DPAK) surface-mount package with exposed thermal tab connected to VOUT. The tab must be soldered to a ≥100 mm² copper pour for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM1117DT-5.0/NOPB, AP1117D50G-13 adds −20°C start-up and tighter load regulation (50mV vs. 60mV), while TLV1117-50CDCYR trades 200mA current capacity and higher thermal resistance for smaller footprint-making AP1117D50G-13 optimal for thermally demanding industrial 1A loads.

Availability

AP1117D50G-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card core supply, and industrial controller I/O supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP1117D50G-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' precision linear regulator product line, designed specifically for high-reliability, low-noise, and thermally robust power delivery in computing, industrial, and communications infrastructure.

FAQ

What is the minimum input voltage required for AP1117D50G-13 to maintain regulation?

The device requires VIN ≥ VOUT + dropout voltage. With 5.0V output and max 1.4V dropout at 1A, minimum input is 6.4V. At light loads (<10mA), dropout drops to ~1.2V, allowing 6.2V operation-but 6.5V is recommended for margin across temperature and tolerance.

Can AP1117D50G-13 use ceramic output capacitors?

Yes-AP1117D50G-13 is explicitly qualified for MLCCs. Use ≥4.7µF X7R dielectric with ESR ≤0.5Ω. Y5V dielectrics are prohibited due to capacitance loss at DC bias and temperature; X7R ensures stable regulation across −20°C to +125°C.

How is thermal performance affected by PCB layout for TO252 package?

θJA drops from 73°C/W (baseline) to ~42°C/W with a 500mm² 2oz copper pour under the thermal tab. Traces longer than 10mm to input/output capacitors degrade transient response and stability; keep all capacitor traces ≤5mm and directly connect tab to inner ground plane.

Is AP1117D50G-13 pin-compatible with other 1117-family regulators?

Yes-AP1117D50G-13 shares identical TO252-3 pinout (VIN-VOUT-GND) and footprint with industry-standard 1117 regulators. However, its improved load regulation (50mV vs. 60–100mV), lower thermal resistance, and −20°C rating provide measurable system-level advantages in industrial deployments.