Diodes Incorporated AP1117Y50L-13

Overview

AP1117Y50L-13 from Diodes Incorporated is a 1A low-dropout linear regulator in fixed 5.0V output mode, housed in a lead-free SOT89-3 package. It delivers stable regulation with ≤1.4V dropout at full load, supports 6.4–18V input, and operates across 0°C to +125°C junction temperature. Designed for high-speed bus termination and 3.3V/5V logic supplies, it powers VGA card voltage rails and PC peripherals.

For engineers reviewing the AP1117Y50L-13 datasheet, AP1117Y50L-13 pinout, AP1117Y50L-13 application, or AP1117Y50L-13 equivalent, key selection criteria include guaranteed 5.0V ±1% output accuracy at 1A, thermal shutdown protection, fast transient response, and compatibility with MLCC output capacitors down to 4.7µF.

Technical Context

The AP1117Y50L-13 integrates an internal 1.25V reference, error amplifier, current-limit circuitry, and thermal shutdown comparator. Its fixed-output architecture eliminates external feedback resistors, simplifying layout for space-constrained applications like VGA cards and embedded peripherals.

It uses a PNP pass transistor topology enabling low dropout (1.3V typical at 1A), stable operation with ceramic or tantalum output capacitors (ESR ≤0.5Ω), and ripple rejection of 60–70dB at 180Hz - critical for noise-sensitive analog and digital logic supplies.

Key Specifications

Pinout & Package

SOT89-3 package: 3-pin surface-mount device with exposed thermal tab connected to VOUT for enhanced heat dissipation. Pin 1 = Adj (GND), Pin 2 = VOUT, Pin 3 = VIN. Tab is electrically tied to VOUT and 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 AP1117Y50L-13, the TO263-packaged AP1117K50L-13 offers superior thermal performance for sustained high-current use, while LD1117S50TR trades slightly looser regulation and lower noise immunity for broader distributor availability - making AP1117Y50L-13 optimal for cost-sensitive, space-limited 5V logic rails requiring proven MLCC compatibility.

Availability

AP1117Y50L-13 is available at Aetrix Electronics and suitable for PC peripheral design, industrial communication modules, and consumer set-top box AV processing requiring stable component supply, RoHS compliance, and SOT89-3 footprint compatibility.

Supply support for AP1117Y50L-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 components for power management, signal integrity, and connectivity applications.

The AP1117 series belongs to Diodes' high-reliability linear regulator product line, engineered specifically for low-noise, low-dropout operation in computing, communications, and consumer electronics where compact size and thermal robustness are essential.

FAQ

What is the minimum input voltage required for AP1117Y50L-13 to maintain 5.0V regulation at 1A?

The AP1117Y50L-13 requires VIN ≥ 6.3V to sustain regulation at 1A load, based on its maximum 1.4V dropout specification. At typical 1.3V dropout, 6.3V input ensures stable 5.0V output. Input below 6.3V causes dropout mode, where VOUT drops linearly with VIN.

Can AP1117Y50L-13 be used with 2.2µF ceramic output capacitors?

No - the datasheet mandates a minimum 4.7µF output capacitor (ceramic X7R or solid tantalum) with ESR ≤0.5Ω. Using 2.2µF violates stability requirements and may cause oscillation or excessive transient overshoot, especially under 1A load steps.

Does AP1117Y50L-13 require an input capacitor, and what type is recommended?

Yes - a minimum 4.7µF input capacitor (ceramic or solid tantalum, ESR ≤0.5Ω) is required close to the VIN pin. This maintains low source impedance during load transients and prevents input voltage sag that could trigger dropout or instability.

How does the thermal shutdown behavior manifest during overload conditions?

When junction temperature reaches ~150°C, the internal thermal limiter disables the pass transistor, dropping VOUT to near zero. Once the die cools to ~130°C, regulation resumes automatically. This hiccup-mode cycling protects the device but indicates insufficient heatsinking or excessive power dissipation.