Diodes Incorporated AP1115AY28G-13

Overview

AP1115AY28G-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. 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 AP1115AY28G-13 datasheet, AP1115AY28G-13 pinout, AP1115AY28G-13 application, or AP1115AY28G-13 equivalent, key selection criteria include guaranteed 2.8V ±1.2% output accuracy at 10mA, 22–28mV load regulation over 0–0.6A, thermal shutdown protection, and fast transient response for dynamic load conditions.

Technical Context

The AP1115AY28G-13 operates as a fixed-output linear regulator with internal reference and error amplifier driving a PNP pass transistor. Its control loop ensures stability with ≥10µF output capacitance (ESR 0.15–20Ω) and supports input-to-output differentials as low as 1.3V at 0.6A.

It features built-in current limiting and thermal shutdown, with junction temperature limited to +150°C. The device maintains regulation across 0–+125°C operating junction range and exhibits 60–70dB ripple rejection at 120Hz with 25µF tantalum output capacitor.

Key Specifications

Pinout & Package

SOT89-3L package with exposed tab (Pin 3) electrically connected to VIN; thermally enhanced for power dissipation. Mold compound is halogen- and antimony-free ("Green") per Diodes Inc. specification.

Key Features

Applications

Availability

AP1115AY28G-13 is available at Aetrix Electronics and suitable for VGA graphics cards, PCIe bus termination circuits, industrial camera sensor biasing, and embedded display interface supplies requiring stable component supply and long-term design continuity.

Supply support for AP1115AY28G-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The AP1115 series belongs to Diodes' precision linear regulator product line, engineered specifically for low-voltage, medium-current applications where dropout voltage, transient response, and thermal robustness are critical-such as PC peripherals and communication interface power rails.

FAQ

What is the maximum input voltage for AP1115AY28G-13?

The absolute maximum DC supply voltage is +18V, but the recommended operating range for reliable 2.8V regulation is 4.3V to 12V. At 4.3V input, the device sustains full 0.6A output while maintaining dropout margin; exceeding 12V increases power dissipation and thermal stress without functional benefit.

Does AP1115AY28G-13 require an external capacitor on the ADJ pin?

No. In fixed-output variants like AP1115AY28G-13, Pin 1 (Adj) is internally connected to ground and serves only as the GND terminal. No external components are needed on this pin-only standard input (≥100µF) and output (≥10µF, 0.15–20Ω ESR) capacitors are required for stability and transient performance.

How does thermal shutdown activate in AP1115AY28G-13?

Thermal shutdown triggers when the silicon junction reaches +150°C, disabling the pass transistor until the die cools below the hysteresis threshold (~135°C). This protection is internal and does not require external circuitry; recovery is automatic once temperature falls sufficiently, with no latch-up behavior.

Can AP1115AY28G-13 be used in place of adjustable AP1115-ADJ variants?

No-it is not a drop-in replacement. AP1115AY28G-13 has fixed 2.8V output and grounded Adj pin, whereas AP1115-ADJ requires external resistors to set output voltage. Pinout differs: AP1115AY28G-13 uses Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN (Type A), while adjustable versions may use Type B pinout (Pin 1 = Adj/GND, Pin 2 = VIN, Pin 3 = VOUT).