Diodes Incorporated AP1115BY50L-13

Overview

AP1115BY50L-13 from Diodes Incorporated is a 0.6A low-dropout positive fixed-mode voltage regulator with 5.0V output, SOT89-3L package, and guaranteed ≤1.3V dropout at full load. It delivers stable 5.0V supply for low-voltage ICs in PC peripherals and VGA cards, supporting input voltages up to 18V while maintaining regulation down to 1.3V VIN–VOUT differential.

For engineers reviewing the AP1115BY50L-13 datasheet, AP1115BY50L-13 pinout, AP1115BY50L-13 application, or AP1115BY50L-13 equivalent, key selection criteria include fixed 5.0V output accuracy (±1%), thermal shutdown protection, fast transient response, 164°C/W junction-to-ambient thermal resistance, and compatibility with 100µF output capacitance (0.15–20Ω ESR).

Technical Context

The AP1115BY50L-13 operates in fixed-output mode with internal resistor divider setting VOUT = 5.0V (±1% at 10mA, TA = +25°C). Its PNP-based LDO architecture enables <1.3V dropout at 0.6A while delivering 60–70dB ripple rejection at 120Hz with 25µF tantalum output capacitor.

Thermal regulation is managed via built-in shutdown triggered at TJ ≥ +150°C, and load regulation is specified as ±40mV over 0–0.6A at VIN = 8V. Minimum load current is 5–10mA across –40°C to +125°C operating junction range.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount plastic package with exposed tab acting as VIN terminal (Pin 2), enabling direct PCB thermal conduction path. Pin 1 is Adj (GND) - tied to ground in fixed-mode variants like AP1115BY50L-13. Pin 3 is VOUT.

Key Features

Applications

Availability

AP1115BY50L-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card core supply, and low-voltage bus termination requiring stable component supply with known thermal and electrical behavior.

Supply support for AP1115BY50L-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, computing, and consumer markets.

The AP1115 series belongs to Diodes' LDO voltage regulator product line, designed specifically for low-noise, low-dropout local regulation in space-constrained applications such as graphics cards, peripheral interfaces, and embedded control modules.

FAQ

Is AP1115BY50L-13 still in active production?

No - AP1115BY50L-13 is officially obsolete and discontinued by Diodes Incorporated as of April 2016. It remains available through Aetrix Electronics' legacy component channel with verified stock, but no future manufacturing or long-term supply commitment exists. Customers are advised to evaluate migration paths for new designs.

What is the correct pin configuration for AP1115BY50L-13?

AP1115BY50L-13 uses the "B" pin version: Pin 1 = Adj (GND), Pin 2 = VIN (tab-connected), Pin 3 = VOUT. This differs from the "A" variant where Pin 1 = VOUT. The B configuration places VIN on the thermally enhanced tab, improving power dissipation capability in fixed-output applications.

Can AP1115BY50L-13 replace adjustable LDOs like AP1117-ADJ?

No - AP1115BY50L-13 is a fixed 5.0V device with no external feedback capability. It cannot substitute for adjustable regulators requiring user-defined output voltages. Its internal resistor divider is trimmed at wafer test; the Adj pin is grounded internally in fixed versions and must be externally tied to GND per datasheet.

What output capacitor is required for stability?

A minimum 10µF output capacitor with ESR between 0.15Ω and 20Ω is required - typically a 100µF tantalum or low-ESR aluminum electrolytic. The datasheet validates stability with 100µF, and using lower values or outside the ESR range risks oscillation or poor transient response.