Diodes Incorporated AP7361C-SPR-13

Overview

AP7361C-SPR-13 from Diodes Incorporated is a 1A adjustable/fixed-output ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained systems. It delivers ±1% output voltage accuracy, 360mV dropout at 1A (3.3V output), and 60µA typical quiescent current, supporting stable operation from 2.2V to 6.0V input across -40°C to +85°C ambient. It is used in LCD-TV power supplies where low-noise, fast-startup regulation of 3.3V or 2.5V rails is required.

For engineers reviewing the AP7361C-SPR-13 datasheet, AP7361C-SPR-13 pinout, AP7361C-SPR-13 application, or AP7361C-SPR-13 equivalent, key selection criteria include dropout performance at full load, EN pin logic thresholds (VIH = 1.0V min), thermal shutdown threshold (150°C), PSRR (75dB @ 1kHz), and compatibility with 2.2µF MLCC output capacitors.

Technical Context

The AP7361C integrates a PMOS pass element, band-gap reference, error amplifier, and protection circuitry including fold-back short-circuit limiting (400mA) and thermal shutdown (150°C trip, 20°C hysteresis). Its architecture supports both fixed-output (1.0V–3.3V) and adjustable modes (0.8V–5.0V via ADJ pin resistor divider), with internal 0.8V reference.

It features active-high enable with 3.0MΩ internal pull-down, 0.05µA shutdown current, and ultra-fast startup (150µs typical with 2.2µF COUT). Stability is guaranteed with ≥2.2µF ceramic, tantalum, or solid polymer output capacitors-no minimum load required.

Key Specifications

Pinout & Package

AP7361C-SPR-13 is packaged in SO-8EPR-a thermally enhanced 8-pin exposed-pad SOIC variant with pin 1 (IN), pin 2 (GND), pin 3 (OUT), pin 4 (ADJ/NC), pin 5 (EN), and pins 6–8 (GND). The exposed pad improves thermal dissipation (θJA = 100°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and TLS850B2TE/V33, AP7361C-SPR-13 uniquely balances 1A output, 360mV dropout, 60µA IQ, and EN functionality in a thermally robust SO-8EPR package-making it optimal for high-density consumer video and connectivity applications where performance and footprint are critical.

Availability

AP7361C-SPR-13 is available at Aetrix Electronics and suitable for LCD-TV main board power delivery, set-top box SoC core regulation, and smart home appliance MCU supply applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for AP7361C-SPR-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 components, with design and manufacturing facilities certified to IATF16949 and ISO9001 standards.

The AP7361C belongs to Diodes' high-performance LDO portfolio targeting consumer, computing, and industrial power management-designed to replace legacy regulators with superior dropout, PSRR, and thermal robustness in compact packages.

FAQ

What is the minimum output capacitor required for stability with AP7361C-SPR-13?

The AP7361C-SPR-13 is stable with a minimum 2.2µF ceramic capacitor (X5R/X7R) placed directly between OUT and GND. Larger values improve load transient response and reduce output voltage undershoot/overshoot. Electrolytic or polymer capacitors may also be used if their ESR falls within the stable region defined in the datasheet's ESR vs. output current graph.

Can AP7361C-SPR-13 be used in adjustable-output configuration?

Yes-AP7361C-SPR-13 supports adjustable output from 0.8V to 5.0V using an external resistor divider connected to the ADJ pin. The output voltage is calculated as VOUT = 0.8V × (1 + R1/R2), where R2 must be ≤80kΩ to maintain reference stability. Fixed-output versions (e.g., 3.3V) tie ADJ internally and leave the pin unconnected.

Does AP7361C-SPR-13 include thermal shutdown protection?

Yes-it incorporates thermal shutdown that disables the output when junction temperature reaches approximately 150°C, with 20°C hysteresis. Output resumes automatically when temperature drops to ~130°C. This protects against damage during sustained overload, poor PCB heatsinking, or high ambient temperatures in enclosed enclosures.

Is the EN pin of AP7361C-SPR-13 compatible with 1.8V logic?

Yes-the EN pin has VIH(min) = 1.0V and VIL(max) = 0.3V, making it fully compatible with 1.8V CMOS logic outputs. No level shifter is required. An internal 3.0MΩ pull-down resistor ensures the device remains disabled if the EN pin is left unconnected or driven by an open-drain source.