Diodes Incorporated AP1115BY28G-13

Overview

AP1115BY28G-13 from Diodes Incorporated is a 0.6A low-dropout positive voltage regulator in fixed 2.8V output mode, housed in a SOT89-3L package with thermal shutdown and current limiting. It delivers stable 2.8V at up to 600mA with ≤1.3V dropout at full load and supports input voltages up to 18V - used in VGA cards and high-speed bus termination.

For engineers reviewing the AP1115BY28G-13 datasheet, AP1115BY28G-13 pinout, AP1115BY28G-13 application, or AP1115BY28G-13 equivalent, key selection criteria include dropout voltage at 600mA, output accuracy over temperature, thermal resistance (θ_JA = 164°C/W), and compatibility with 10µF–100µF output capacitors having 0.15–20Ω ESR.

Technical Context

The AP1115BY28G-13 operates in fixed-output mode (2.8V) with internal reference trimming (±2.4% initial accuracy) and uses a PNP pass transistor architecture enabling low dropout. Its control loop ensures fast transient response to load steps up to 600mA with <±30mV deviation under typical 100µF tantalum output capacitance.

Thermal regulation is enforced via built-in junction temperature sensing (shutdown at +150°C), and line/load regulation are specified across 0–600mA and VIN = VOUT+1.5V to 15V. Ripple rejection reaches 70dB at 120Hz with 25µF tantalum output capacitor.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount, lead-free, halogen-free "Green" compound; tab is VIN (Pin 2) per AP1115B configuration; thermal pad connected to VIN for heat dissipation.

Key Features

Applications

Availability

AP1115BY28G-13 is available at Aetrix Electronics and suitable for VGA graphics cards, PCIe peripheral interfaces, and industrial sensor modules requiring stable component supply with known thermal performance and fixed 2.8V output.

Supply support for AP1115BY28G-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 solutions for industrial, computing, and consumer markets.

The AP1115 series belongs to Diodes' LDO voltage regulator product line, engineered for low-noise, low-dropout operation in space-constrained applications where thermal efficiency and output accuracy are critical.

FAQ

What is the correct pin configuration for AP1115BY28G-13?

AP1115BY28G-13 follows the AP1115B pinout: Pin 1 is Adj (GND), Pin 2 is VIN (connected to thermal tab), and Pin 3 is VOUT. This configuration is confirmed in the datasheet's "Pin Assignments" section and ordering code "B" suffix. The tab must be electrically connected to VIN for proper thermal performance.

Can AP1115BY28G-13 be used with ceramic output capacitors?

Yes, but only if ESR is ≥0.15Ω. The AP1115 requires 0.15–20Ω ESR for stability; standard X7R/X5R ceramics typically fall below 0.05Ω. To comply, add a 0.22Ω–1Ω series resistor or use specialty high-ESR ceramics (e.g., ZRB-type) - verified in DS31026 Rev. 6, page 3, "VOUT" pin description.

Is AP1115BY28G-13 still in production?

No - Diodes Incorporated officially discontinued AP1115 as of April 2016 (DS31026 Rev. 6-4 states "OBSOLETE – PART DISCONTINUED"). Aetrix Electronics stocks remaining authorized inventory but does not offer long-term supply assurance; replacement evaluation is strongly advised for new designs.

What is the maximum allowable power dissipation for AP1115BY28G-13 on a standard PCB?

At θ_JA = 164°C/W and T_J(MAX) = 150°C, with T_A = 85°C ambient, max power dissipation is (150 − 85) / 164 ≈ 0.40W. This corresponds to a 1.3V dropout × 0.31A or 2.0V dropout × 0.20A - aligning with the 5W absolute max rating only under forced-air or heatsink conditions.