Diodes Incorporated AP1115AY33L-13

Overview

AP1115AY33L-13 from Diodes Incorporated is a 0.6A low-dropout positive fixed-mode voltage regulator delivering 3.3V output with ≤1.3V dropout at full load, 60–70dB ripple rejection at 120Hz, and thermal shutdown protection. It operates from 4.8V to 12V input and targets low-current 3.3V logic supplies in PC peripherals and VGA cards.

For engineers reviewing the AP1115AY33L-13 datasheet, AP1115AY33L-13 pinout, AP1115AY33L-13 application, or AP1115AY33L-13 equivalent, key selection criteria include guaranteed 3.3V ±1% output accuracy at 10mA–600mA, SOT89-3L package thermal resistance (θ_JA = 164°C/W), fast transient response, and fixed-output configuration requiring no external feedback resistors.

Technical Context

The AP1115AY33L-13 implements a fixed-output LDO architecture with internal reference (1.25V typ), PNP pass transistor, and integrated current limiting and thermal shutdown circuitry. Its control loop ensures stability with 10µF output capacitor (ESR 0.15–20Ω) and supports operation up to +125°C junction temperature.

Designed for low-noise, low-quiescent-current regulation, it achieves 0.008–0.04%/W thermal regulation and <0.2% line regulation across 4.8–12V input range. The device requires VIN ≥ VOUT + 1.3V to maintain regulation and exhibits 26–33mV load regulation over 0–600mA output current.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount outline with exposed tab (VIN-connected per AP1115B variant); JEDEC-compliant footprint (D = 4.4–4.6mm, E = 2.29–2.60mm, H = 3.94–4.25mm); RoHS-compliant, halogen-free "Green" molding compound.

Key Features

Applications

Availability

AP1115AY33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card logic supply, and low-voltage bus termination requiring stable component supply despite end-of-life status.

Supply support for AP1115AY33L-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 for industrial and computing markets.

The AP1115 series belongs to Diodes' LDO voltage regulator product line, engineered for low-noise, low-dropout operation in space-constrained applications demanding precise fixed or adjustable outputs from 1.25V to 5.0V.

FAQ

Is AP1115AY33L-13 still in production?

No - AP1115AY33L-13 is officially obsolete and discontinued by Diodes Incorporated as of April 2016. Aetrix Electronics maintains limited legacy stock for last-time buy and repair programs, with full traceability and documentation per original DS31026 Rev. 6-4 specification.

What is the correct pin configuration for AP1115AY33L-13?

AP1115AY33L-13 uses the AP1115B pinout: Pin 1 = Adj (GND), Pin 2 = VIN, Pin 3 = VOUT. The exposed tab is electrically connected to VIN, requiring appropriate PCB copper isolation or intentional connection per thermal design needs.

Can AP1115AY33L-13 replace adjustable LDOs like AP1117-ADJ?

No - AP1115AY33L-13 is a fixed 3.3V device with no adjustment capability. It lacks the ADJ pin functionality of AP1117-ADJ and cannot replicate programmable output voltages. Direct substitution requires verifying identical pinout, thermal performance, and transient response in the target circuit.

What capacitor values are mandatory for stable operation?

A minimum 10µF output capacitor with ESR between 0.15Ω and 20Ω is required for stability. Input capacitance should also be ≥100µF (as shown in typical application circuits) to prevent VIN sag during load transients; both capacitors must meet the specified ESR range to avoid oscillation.