Diodes Incorporated AP1084D33G-13

Overview

AP1084D33G-13 from Diodes Incorporated is a 5A low-dropout linear regulator in fixed 3.3V output mode, housed in a TO252-3L surface-mount package. It delivers stable 3.3V at up to 5A with ≤1.4V dropout at full load, built-in thermal shutdown and current limiting, and supports high-speed bus termination and low-current 3.3V logic supply in embedded and VGA card applications.

For engineers reviewing the AP1084D33G-13 datasheet, AP1084D33G-13 pinout, AP1084D33G-13 application, or AP1084D33G-13 equivalent, key selection criteria include dropout voltage under 5A load, thermal resistance (θJA = 73°C/W), output stability with ≥10µF/0.15–20Ω ESR capacitor, fixed-mode GND pin configuration, and RoHS-compliant green molding compound.

Technical Context

The AP1084D33G-13 operates as a fixed-output LDO with internal reference (1.25V) and error amplifier, using a PNP pass transistor topology to achieve low dropout. Its control loop is optimized for fast transient response-demonstrated by <50µs recovery from 0→5A load steps-and maintains regulation with input voltages as low as 4.8V (VOUT + 1.5V min).

Thermal protection activates at 150°C junction temperature, and current limiting engages at ≥5.1A when VIN–VOUT = 5V. The device requires no external compensation in fixed mode and relies on a minimum 10µF output capacitor (ESR 0.15–20Ω) for stability across operating temperatures (0–125°C).

Key Specifications

Pinout & Package

AP1084D33G-13 uses the TO252-3L (DPAK) thermally enhanced surface-mount package with exposed thermal pad (Tab = VOUT). Pin 1 is Adj/GND (grounded internally for fixed 3.3V mode), Pin 2 is VOUT, and Pin 3 is VIN. The tab must be soldered to a large copper pour for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1084K33G-13, the AP1084D33G-13 trades thermal headroom for smaller footprint and lower assembly cost; versus TLV1117-33CDCYR, it delivers 6.25× higher current and 4× lower dropout-making it irreplaceable in high-power 3.3V rail generation.

Availability

AP1084D33G-13 is available at Aetrix Electronics and suitable for high-speed bus termination, VGA graphics card power, and embedded system logic supply requiring stable component supply and long-term industrial availability.

Supply support for AP1084D33G-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 AP1084 series belongs to Diodes' high-current LDO portfolio, engineered specifically for low-voltage IC supply in demanding applications such as high-speed bus termination and graphics subsystems where dropout, transient response, and thermal robustness are critical.

FAQ

Is AP1084D33G-13 pin-compatible with other AP1084 fixed-output variants?

Yes-AP1084D33G-13 shares identical TO252-3L pinout and terminal functions with all AP1084-Dxx variants (e.g., AP1084D15G-13, AP1084D25G-13). Pin 1 is GND, Pin 2 is VOUT, and Pin 3 is VIN across all fixed-output versions. No layout change is needed when switching between 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V fixed variants in the same package.

What is the minimum output capacitance required for stability?

The AP1084D33G-13 requires a minimum 10µF aluminum electrolytic capacitor with ESR between 0.15Ω and 20Ω at the VOUT pin. Tantalum or polymer capacitors meeting this ESR range are also acceptable. Ceramic capacitors alone are insufficient due to near-zero ESR, which can cause oscillation unless paralleled with ≥0.15Ω damping resistance.

Does AP1084D33G-13 support remote sensing?

No-AP1084D33G-13 is a 3-terminal LDO without dedicated sense pins. Load regulation is measured at the VOUT pin, not at the load point. For best accuracy, keep PCB traces from VOUT to load short and low-impedance; voltage drop across traces contributes directly to effective load regulation error.

Can AP1084D33G-13 be used in adjustable mode?

No-AP1084D33G-13 is factory-configured for fixed 3.3V output. The "D" prefix denotes TO252-3L package, and "33" specifies fixed 3.3V; the Adj pin is internally grounded. To use adjustable mode, select AP1084D-13 (no voltage suffix) and add external R1/R2 resistors per the VOUT = 1.25(1 + R2/R1) formula.