Diodes Incorporated AP1115AY18G-13

Overview

AP1115AY18G-13 from Diodes Incorporated is a 0.6A low-dropout positive fixed-mode voltage regulator delivering 1.8V output with ≤1.3V dropout at full load, SOT89-3L package, and built-in thermal shutdown. It supplies stable 1.8V for low-current logic rails in VGA cards and PC peripherals, supporting input voltages up to 18V.

For engineers reviewing the AP1115AY18G-13 datasheet, AP1115AY18G-13 pinout, AP1115AY18G-13 application, or AP1115AY18G-13 equivalent, key selection criteria include guaranteed 1.8V ±3% output accuracy at 10mA, 1.1V typical dropout at 0.6A, fast transient response, and compatibility with 100µF tantalum/low-ESR output capacitors.

Technical Context

The AP1115AY18G-13 operates in fixed-output mode (1.8V) using internal resistor feedback, eliminating external adjustment components. Its control architecture integrates overcurrent limiting and thermal shutdown circuitry that activates at +150°C junction temperature.

Designed for low-noise, high-stability operation, it achieves 70dB ripple rejection at 120Hz with 25µF tantalum output capacitance and maintains <0.04%/W thermal regulation under pulsed load conditions.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount outline with exposed tab (Pin 2 = VIN, Pin 3 = VOUT, Pin 1 = Adj/GND); RoHS-compliant, halogen-free "Green" molding compound.

Key Features

Applications

Availability

AP1115AY18G-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PC peripheral logic supply, and embedded display interface applications requiring stable component supply despite end-of-life status.

Supply support for AP1115AY18G-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.

The AP1115 series belongs to Diodes' precision LDO regulator product line, engineered for low-noise, low-dropout operation in space-constrained computing and peripheral applications where fixed-output simplicity and thermal robustness are critical.

FAQ

What is the correct pin configuration for AP1115AY18G-13?

AP1115AY18G-13 uses the AP1115B pinout: Pin 1 = Adj/GND, Pin 2 = VIN, Pin 3 = VOUT. The exposed tab is electrically connected to VIN per Diodes' SOT89-3L mechanical drawing AP02002, requiring proper PCB thermal pad isolation from ground planes.

Can AP1115AY18G-13 replace adjustable LDOs in existing designs?

No - AP1115AY18G-13 is factory-trimmed for fixed 1.8V output only and lacks external feedback capability. Substitution requires verifying that the target application does not require voltage adjustability or different output levels, as no resistor network can modify its output.

What output capacitor is required for stability?

A minimum 10µF capacitor with ESR between 0.15Ω and 20Ω must be placed directly between VOUT and GND. Diodes recommends 100µF tantalum or low-ESR polymer capacitors, as validated in the datasheet's typical application circuits for 1.8V fixed-mode operation.

Is AP1115AY18G-13 still in production?

No - Diodes Incorporated declared AP1115 obsolete in April 2016 (DS31026 Rev. 6-4). Aetrix Electronics offers remaining genuine stock with full traceability, but no second-source or replacement part is designated by the manufacturer for this specific variant.