Diodes Incorporated AP7361C-12SP-13

Overview

AP7361C-12SP-13 from Diodes Incorporated is a 1A fixed-output (1.2V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained portable and battery-powered systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V version; 1.2V variant maintains sub-500mV dropout), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limiting (1.5A). It is used in LCD-TV power rails where stable low-voltage biasing is required.

For engineers reviewing the AP7361C-12SP-13 datasheet, AP7361C-12SP-13 pinout, AP7361C-12SP-13 application, or AP7361C-12SP-13 equivalent, key selection criteria include dropout performance at 1.2V output, SO-8EP thermal resistance (100°C/W), EN logic thresholds (VIH = 1.0V min), stability with ≥2.2µF MLCC output capacitors, and compatibility with 2.2–6.0V input sources.

Technical Context

The AP7361C-12SP-13 implements a PMOS pass transistor architecture enabling ultra-low dropout voltage and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output via feedback to the ADJ/NC pin - unused in fixed 1.2V configuration but retained as no-connect in SO-8EP package.

Enable control is implemented with active-high EN pin (VIH ≥ 1.0V, VIL ≤ 0.3V), supporting direct microcontroller GPIO interfacing. Protection circuitry includes fold-back current limiting (triggers at ~400mA during short-circuit) and thermal shutdown activation at ~150°C with 20°C hysteresis, ensuring robust operation under fault conditions without external components.

Key Specifications

Pinout & Package

AP7361C-12SP-13 is packaged in SO-8EP (exposed pad), a thermally enhanced 8-pin surface-mount package with GND-connected thermal pad on underside. Pin 1 is IN; Pin 2 is GND; Pin 3 is OUT; Pin 4 is NC; Pin 5 is EN; Pin 6 is NC; Pin 7 is NC; Pin 8 is GND. The exposed pad must be soldered to a PCB thermal plane for optimal thermal performance (θJA = 100°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1202E/TO and TLS850F1EJV50, AP7361C-12SP-13 uniquely balances 1A output, 60µA IQ, SO-8EP thermal performance, and consumer-grade cost - making it optimal for non-automotive, medium-current, space-constrained applications where both efficiency and drive strength matter.

Availability

AP7361C-12SP-13 is available at Aetrix Electronics and suitable for LCD-TV main board biasing, set-top box power management, and home appliance control panel applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP7361C-12SP-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 company specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, signal integrity, and connectivity solutions.

The AP7361C belongs to Diodes' high-performance LDO regulator product line, engineered for low-noise, low-dropout power delivery in portable, consumer, and industrial electronics where reliability and compact footprint are essential.

FAQ

What is the minimum input voltage required for AP7361C-12SP-13 to maintain regulation at 1.2V output?

The minimum input voltage is determined by dropout: at 1A load, max dropout is 440mV, so VIN(min) = 1.2V + 0.44V = 1.64V. However, the device's absolute minimum specified input is 2.2V per Recommended Operating Conditions - meaning reliable operation starts at 2.2V, with margin for line and load transients. Below 2.2V, functionality is not guaranteed.

Can AP7361C-12SP-13 be used without connecting the EN pin?

Yes, but only if the regulator must remain permanently enabled. The EN pin has an internal 3.0MΩ pull-down resistor, so leaving it unconnected defaults the device to OFF. To force ON, tie EN directly to IN. Do not leave EN floating in production designs - unintended disablement may occur due to noise coupling or leakage paths.

Is the SO-8EP package's exposed thermal pad required to be connected to PCB ground?

Yes. The exposed pad is internally connected to GND and serves as the primary thermal conduction path. For θJA = 100°C/W performance, it must be soldered to a dedicated PCB copper pour tied to system ground with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Omitting this connection degrades thermal performance and risks thermal shutdown under load.

Does AP7361C-12SP-13 require an external resistor divider for 1.2V operation?

No. The "-12" suffix denotes factory-trimmed fixed 1.2V output. The ADJ/NC pin (Pin 4) is not connected internally for this variant and must remain unconnected. External resistors are only needed for adjustable versions (e.g., AP7361C-ADJ); using them with AP7361C-12SP-13 would disrupt regulation and is prohibited.