Diodes Incorporated AP1086DG-13

Overview

AP1086DG-13 from Diodes Incorporated is a 1.5A low dropout (LDO) positive voltage regulator in TO252-3L package, configurable as adjustable or fixed-output (3.3V), with 1.4V max dropout at full load, ±1% load regulation, and 60–70dB ripple rejection. It delivers stable 3.3V/1.5A output from 4.8–12V input for high-speed bus termination and logic supply in VGA cards and embedded systems.

For engineers reviewing the AP1086DG-13 datasheet, AP1086DG-13 pinout, AP1086DG-13 application, or AP1086DG-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1.5A, thermal shutdown protection, minimum 10µF output capacitance requirement, and TO252-3L thermal resistance (θ_JA = 101°C/W).

Technical Context

The AP1086DG-13 implements a standard bandgap reference (1.25V) with internal error amplifier and PNP pass transistor, enabling fixed 3.3V output without external resistors. Its fast transient response is achieved via optimized internal compensation requiring only a 10µF minimum output capacitor.

Thermal shutdown activates at 150°C junction temperature, and current limiting trips at ≥1.6A. The device operates across 0–125°C junction range with guaranteed regulation when VIN exceeds VOUT by ≥1.4V - critical for maintaining 3.3V output from marginal 4.8V inputs.

Key Specifications

Pinout & Package

AP1086DG-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal pad connected internally to VOUT. Pin 1 (Adj/GND) serves as ground in fixed-mode operation; Pin 2 (VOUT) is the regulated output and thermal pad connection; Pin 3 (VIN) accepts 4.8–12V input. Layout requires direct copper pour under the tab for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MIC29302WU-3.3 and LD1086DT33R, AP1086DG-13 offers optimal balance of low dropout (1.4V), SMT-friendly TO252-3L footprint, and proven stability with low-cost aluminum capacitors - making it preferred for cost-sensitive, space-constrained industrial and graphics applications.

Availability

AP1086DG-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PCIe bus termination, industrial PLC I/O modules, and embedded ARM SoC core rail applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP1086DG-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 devices for industrial, computing, and consumer markets.

The AP1086 product line delivers high-current, low-dropout linear regulators targeting cost-sensitive, thermally constrained applications such as graphics cards, bus termination, and embedded logic supplies - emphasizing reliability, ease of use, and compatibility with standard passive components.

FAQ

What is the minimum input voltage required for AP1086DG-13 to regulate 3.3V at 1.5A?

The AP1086DG-13 requires VIN ≥ VOUT + 1.4V to maintain regulation at full load. For a 3.3V output, minimum input is 4.7V. Below this, dropout occurs and output voltage drops linearly with input. This value is guaranteed across 0–125°C junction temperature per DS31028 Rev. 6-2.

Can AP1086DG-13 be used with ceramic output capacitors?

Yes, but only with careful ESR consideration. The datasheet specifies ≥10µF aluminum electrolytic for guaranteed stability. Ceramic capacitors with near-zero ESR may cause oscillation unless a 1–5Ω damping resistor is added in series with the capacitor. Diodes Inc. does not characterize or guarantee stability with pure ceramic outputs.

Is the thermal pad of AP1086DG-13 electrically connected, and how must it be handled on the PCB?

Yes, the exposed thermal pad on the TO252-3L package is internally connected to Pin 2 (VOUT). It must be soldered to a dedicated copper pour tied directly to the 3.3V plane - not to ground or floating. Insufficient thermal pad area increases θ_JA beyond 101°C/W, risking thermal shutdown under sustained 1.5A load.

Does AP1086DG-13 support remote voltage sensing?

No. AP1086DG-13 is a 3-terminal regulator with no sense pin. Load regulation is specified at the output pin (1/18″ from package), not at the load. For applications requiring <±10mV accuracy at point-of-load, a 4-terminal LDO with separate SENSE pin (e.g., TPS7A83A) is required instead.