Diodes Incorporated AP7361-33D-13

Overview

AP7361-33D-13 from Diodes Incorporated is a 1A fixed-output (3.3V) ultra-low dropout linear regulator in TO252 package with enable control, 70µA quiescent current, and thermal shutdown protection. It delivers stable power to FPGA I/O rails, laptop subsystems, and battery-powered audio devices under input voltages from 2.2V to 6.0V.

For engineers reviewing the AP7361-33D-13 datasheet, AP7361-33D-13 pinout, AP7361-33D-13 application, or AP7361-33D-13 equivalent, key selection criteria include dropout voltage at 1A (500mV), ±1% output accuracy over temperature, PSRR of 65dB at 1kHz, and compatibility with ≥2.2µF ceramic output capacitors without external compensation.

Technical Context

The AP7361-33D-13 integrates a PMOS pass element, precision 0.8V bandgap reference, and error amplifier for high DC accuracy and fast transient response. Its fixed 3.3V output eliminates external resistor divider requirements, simplifying layout for space-constrained applications.

Enable logic operates with VIH ≥1.0V and VIL ≤0.3V, supporting direct interfacing with 1.8V/3.3V microcontrollers. Built-in current limiting (1.1–1.5A) and thermal shutdown (150°C trip, 20°C hysteresis) provide fault resilience without external circuitry.

Key Specifications

Pinout & Package

AP7361-33D-13 uses the TO252 (DPAK) package with exposed thermal pad for enhanced power dissipation (θJA = 95°C/W). Pin assignments are validated per Diodes DS33626 Rev. 11-3: Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-3302E/TO and TLS850F3TAV50, AP7361-33D-13 uniquely balances 1A output, 500mV dropout, and 70µA IQ in an industrial-grade TO252 package-making it optimal for cost-sensitive, medium-power consumer and computing applications where automotive qualification is unnecessary.

Availability

AP7361-33D-13 is available at Aetrix Electronics and suitable for server power management, FPGA I/O supply, and portable audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361-33D-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7361 belongs to Diodes' high-performance LDO family designed for low-noise, high-accuracy power delivery in computing, consumer, and industrial systems where ultra-low dropout and fast transient response are critical.

FAQ

What is the maximum allowable input voltage for AP7361-33D-13?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.2V to 6.0V. Exceeding 6.0V risks triggering internal overvoltage protection or degrading long-term reliability, even if within absolute ratings. Operation at 6.0V is valid only when thermal limits permit based on calculated power dissipation (PD = (VIN − 3.3V) × IOUT).

Can AP7361-33D-13 be used without an enable signal?

Yes - tie the EN pin directly to the IN pin to maintain permanent enable. The device requires no pull-up resistor since EN is active-high with VIH ≥1.0V and VIN ≥2.2V satisfies this threshold. This configuration is commonly used in fixed-rail applications where dynamic power control is unnecessary.

Is a minimum load required for output stability?

No minimum load is required. The AP7361-33D-13 remains stable and regulated from zero load up to 1.0A, as confirmed in the datasheet's "No Load Stability" section. This eliminates the need for dummy loads in always-on circuits like real-time clock supplies or sensor bias rails.

What thermal considerations apply to the TO252 package?

The TO252 package has θJA = 95°C/W on a standard 2"x2" FR-4 board with 2oz copper. To avoid thermal shutdown at 1A with 6.0V input (PD = 2.7W), the PCB must include ≥4 thermal vias under the exposed pad connected to an internal ground plane. Ambient temperature must stay ≤60°C for continuous operation at full load.