Diodes Incorporated AP1115AY35L-13

Overview

AP1115AY35L-13 from Diodes Incorporated is a 0.6A low-dropout positive voltage regulator in fixed 3.5V output mode, housed in a lead-free 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 AP1115AY35L-13 datasheet, AP1115AY35L-13 pinout, AP1115AY35L-13 application, or AP1115AY35L-13 equivalent, key selection factors include guaranteed 3.5V ±1.4% output accuracy at 10mA, 28–35mV load regulation over 0–0.6A, thermal shutdown protection, and SOT89-3L thermal resistance of 164°C/W (no heatsink).

Technical Context

The AP1115AY35L-13 operates in fixed-output mode with internal resistor divider setting VOUT = 3.5V. Its control architecture uses a PNP pass transistor enabling low dropout and fast transient response, with built-in current limiting and thermal shutdown triggered at TJ ≥150°C.

It requires ≥10µF output capacitance (ESR 0.15–20Ω) for stability and mandates VIN ≥ VOUT + 1.3V under full load. Input ripple rejection is 60–70dB at 120Hz with 25µF tantalum output capacitor, and line regulation is ≤0.2% across VIN = VOUT+1.5V to 15V.

Key Specifications

Pinout & Package

SOT89-3L package: 3-pin surface-mount outline with exposed thermal tab (Pin 3 = VOUT, Pin 2 = VIN, Pin 1 = Adj/GND per AP1115B pin configuration; tab electrically connected to VIN). Dimensions: 4.5mm × 2.45mm × 1.5mm, 1.5mm pitch, 0.9mm max height.

Key Features

Applications

Availability

AP1115AY35L-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PCIe bus termination, and industrial I/O module logic supply requiring stable component supply despite end-of-life status.

Supply support for AP1115AY35L-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 specifically for low-voltage, high-current point-of-load applications where dropout voltage, thermal robustness, and noise immunity are critical design constraints.

FAQ

What is the correct pin configuration for AP1115AY35L-13?

AP1115AY35L-13 follows the AP1115B pinout: Pin 1 = Adj/GND (internally grounded), Pin 2 = VIN, Pin 3 = VOUT. The metal tab is electrically connected to VIN per Diodes' SOT89-3L mechanical drawing AP02002. This differs from AP1115A (tab = Adj/GND).

Can AP1115AY35L-13 be used as an adjustable regulator?

No. AP1115AY35L-13 is factory-configured for fixed 3.5V output only. The "Y35" suffix denotes 3.5V fixed mode, and internal feedback resistors are trimmed and unmodifiable. Adjustable operation requires AP1115ADJ variants (e.g., AP1115A-13 or AP1115B-13 with no voltage code).

What is the maximum allowable input voltage for reliable operation?

The absolute maximum VIN is +18V DC, but recommended operating range is VIN ≤ VOUT + 6V for thermal safety. At 3.5V output and 0.6A load, input must exceed 4.8V (VOUT + dropout); sustained operation above 12V increases junction temperature beyond safe limits without heatsinking.

Is AP1115AY35L-13 still in production?

No. Diodes Incorporated declared AP1115 obsolete in April 2016 (DS31026 Rev. 6-4). Aetrix Electronics offers remaining authorized inventory with full traceability and supports legacy design continuity through controlled allocation and cross-reference guidance.