Diodes Incorporated AP7361C-18FGE-7

Overview

AP7361C-18FGE-7 from Diodes Incorporated is a 1A fixed-output (1.8V), ultra-low dropout linear regulator in U-DFN3030-8 (Type E) package with enable control, ±1% output accuracy, 360mV dropout at 1A (3.3V version), and 60µA quiescent current-designed for power rail regulation in space-constrained portable electronics such as LCD-TVs, set-top boxes, and battery-powered home appliances.

For engineers reviewing the AP7361C-18FGE-7 datasheet, AP7361C-18FGE-7 pinout, AP7361C-18FGE-7 application, or AP7361C-18FGE-7 equivalent, key selection criteria include dropout voltage at 1.8V output, EN pin logic thresholds (VIH = 1.0V min), thermal shutdown threshold (150°C), stability with ≥2.2µF MLCC output capacitors, and package-specific power dissipation limits (θJA = 70°C/W).

Technical Context

The AP7361C-18FGE-7 integrates a PMOS pass element, band-gap reference (0.8V), error amplifier, and protection circuitry including fold-back short-circuit limiting (400mA) and thermal shutdown (150°C trip, 130°C hysteresis). It operates across 2.2V–6.0V input while delivering stable 1.8V ±1% output up to 1A.

Its enable function requires VIH ≥1.0V and VIL ≤0.3V; internal EN pull-down resistor is 3.0MΩ. The device achieves 75dB PSRR at 1kHz and supports fast start-up (150µs typical) without compromising low IQ performance.

Key Specifications

Pinout & Package

AP7361C-18FGE-7 uses the U-DFN3030-8 (Type E) package: 3.0mm × 3.0mm × 0.55mm body, exposed thermal pad (Pin 4), matte tin-plated leads, moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1802E/MB and TLS850F0TES/V2, AP7361C-18FGE-7 uniquely balances 1A output, 60µA IQ, and U-DFN3030-8 thermal performance-making it optimal for cost-sensitive, high-volume consumer electronics where space, efficiency, and load capability are jointly constrained.

Availability

AP7361C-18FGE-7 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top box core logic supply, and smart home appliance MCU supply requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for AP7361C-18FGE-7 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, with operations certified to IATF16949:2016 and ISO9001 standards.

The AP7361C belongs to Diodes' high-performance LDO family targeting portable and space-constrained applications-designed to deliver low dropout, low IQ, and robust protection in compact packages for consumer, computing, and industrial end equipment.

FAQ

What is the minimum input voltage required for AP7361C-18FGE-7 to maintain regulation at 1A load?

The minimum input voltage is calculated as VOUT + VDROPOUT = 1.8V + 0.34V = 2.14V. Per datasheet Section 5, dropout voltage at 1.8V/1A is 340mV typical. Therefore, VIN must remain ≥2.14V under full load to avoid dropout; derating is recommended for ambient temperature and PCB thermal resistance effects.

Can AP7361C-18FGE-7 operate without an external output capacitor?

No. The device requires a minimum 2.2µF ceramic capacitor between OUT and GND for stability, as confirmed in Section 10 of the datasheet. Omitting this capacitor causes oscillation and output voltage instability. Larger values improve transient response but are not mandatory for basic regulation.

Is the EN pin internally pulled down on AP7361C-18FGE-7?

Yes. The EN pin has an internal 3.0MΩ pull-down resistor (RENPD), ensuring the regulator remains disabled during power-up until a valid high logic level (≥1.0V) is applied. This eliminates the need for an external pull-down in most designs unless faster turn-off is required.

How does thermal performance differ between U-DFN3030-8 and SO-8EP packages for AP7361C-18FGE-7?

U-DFN3030-8 (θJA = 70°C/W) provides significantly better thermal performance than SO-8EP (θJA = 100°C/W) due to its exposed thermal pad and optimized layout. At 1A load with 3.3V input, U-DFN3030-8 dissipates 1.5W and rises ~105°C above ambient, whereas SO-8EP would exceed thermal shutdown without aggressive heatsinking.