Diodes Incorporated AP1115AY25L-13

Overview

AP1115AY25L-13 from Diodes Incorporated is a 0.6A low-dropout positive voltage regulator in fixed 2.5V output mode, housed in a SOT89-3L package. It delivers stable regulation with ≤1.3V dropout at full load, supports input voltages up to 18V, and targets low-voltage IC supply applications including VGA card power rails and high-speed bus termination.

For engineers reviewing the AP1115AY25L-13 datasheet, AP1115AY25L-13 pinout, AP1115AY25L-13 application, or AP1115AY25L-13 equivalent, key selection considerations include guaranteed 2.5V ±1% output accuracy at 10mA, 20–25mV load regulation over 0–0.6A, thermal shutdown protection, and SOT89-3L thermal resistance (θ_JA = 164°C/W) under standard PCB layout.

Technical Context

The AP1115AY25L-13 operates as a fixed-output linear regulator with internal reference and error amplifier driving a PNP pass transistor. Its control loop ensures fast transient response-demonstrated by <100µs recovery from 100mA–600mA load steps-and maintains regulation down to 1.3V input-to-output differential.

It integrates current limiting and thermal shutdown circuitry that activate at ≥0.7A output current and ≥150°C junction temperature. The device requires no external compensation and achieves 60–70dB ripple rejection at 120Hz with 25µF tantalum output capacitance.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount outline with exposed tab (Pin 3), 4.4–4.6mm body length, 2.29–2.60mm width, 1.40–1.60mm height, and 1.50mm pin pitch. Tab is electrically connected to Pin 3 (VIN) per AP1115B configuration.

Key Features

Applications

Availability

AP1115AY25L-13 is available at Aetrix Electronics and suitable for VGA graphics cards, PCIe bus termination networks, and industrial I/O modules requiring stable component supply despite end-of-life status.

Supply support for AP1115AY25L-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 communications markets.

The AP1115 product line delivers cost-optimized, fixed- and adjustable-output LDO regulators targeting board-level power distribution in PC peripherals and legacy graphics subsystems where low quiescent current and thermal robustness are critical.

FAQ

Is AP1115AY25L-13 still in active production?

No. Diodes Incorporated declared AP1115AY25L-13 obsolete in April 2016 (DS31026 Rev. 6-4). It is discontinued with no direct replacement offered by the manufacturer. Aetrix Electronics maintains limited legacy stock for design continuity and repair programs.

What is the correct pinout configuration for AP1115AY25L-13?

AP1115AY25L-13 uses the AP1115B pinout: Pin 1 = Adj/GND, Pin 2 = VIN, Pin 3 = VOUT. The exposed tab is electrically connected to Pin 2 (VIN), not ground-critical for thermal and electrical layout verification.

Can AP1115AY25L-13 replace adjustable AP1115 variants in existing designs?

No. AP1115AY25L-13 is factory-trimmed for fixed 2.5V output and lacks external feedback capability. Substituting it for an adjustable version (e.g., AP1115ADJ) would require redesigning the output network and verifying load/line regulation margins.

What are the minimum capacitor requirements for stable operation?

A minimum 10µF output capacitor (ESR 0.15–20Ω) is mandatory for loop stability. Input capacitance must be ≥100µF (same ESR range) to prevent input sag during 0.6A load transients. Tantalum or low-ESR aluminum electrolytics are validated per datasheet.