Diodes Incorporated AP7365-39WG-7

Overview

AP7365-39WG-7 from Diodes Incorporated is a fixed-output 3.9V, 600mA low-dropout linear regulator in SOT25 package, featuring 35μA quiescent current, 300mV dropout at full load, and active-high enable control. It delivers stable power to FPGA I/O rails and portable device subsystems with fast 200μs startup and excellent load transient response.

For engineers reviewing the AP7365-39WG-7 datasheet, AP7365-39WG-7 pinout, AP7365-39WG-7 application, or AP7365-39WG-7 equivalent, key selection criteria include dropout voltage at 600mA, PSRR at 1kHz, thermal shutdown threshold, EN logic thresholds, and compatibility with 1μF ceramic output capacitors.

Technical Context

The AP7365-39WG-7 integrates a PMOS pass element, precision 0.8V bandgap reference, and error amplifier optimized for low-noise, fast-transient regulation. Its architecture enables stable operation with only 1μF output capacitance and supports input voltages from 2V to 6V while maintaining ±2% output accuracy across –40°C to +85°C.

Thermal protection activates at +145°C with +15°C hysteresis, and current limiting clamps output to ~1.4A during overload. The EN pin requires VIH ≥ 1.4V and VIL ≤ 0.4V for reliable on/off control, and the device draws just 0.1μA in shutdown mode.

Key Specifications

Pinout & Package

SOT25 (W package) - 5-pin surface-mount package with exposed pad not electrically connected; footprint optimized for thermal dissipation on 1oz copper PCB with recommended pad layout per DS32260 Rev. 10–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and XC6206P392MR-G, the AP7365-39WG-7 uniquely combines 600mA drive, active-high EN, full protection suite, and SOT25 thermal capability-making it the sole fit for FPGA I/O and industrial 3.9V power where both current and robustness are mandatory.

Availability

AP7365-39WG-7 is available at Aetrix Electronics and suitable for FPGA I/O power, mobile baseband subsystems, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for AP7365-39WG-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 company specializing in discrete, analog, and mixed-signal solutions for high-growth markets including automotive, industrial, computing, and consumer electronics.

The AP7365 belongs to Diodes' high-performance LDO family designed specifically for battery-powered and space-constrained applications demanding ultra-low I_Q, fast transient response, and comprehensive fault protection.

FAQ

What is the minimum input voltage required for AP7365-39WG-7 to maintain regulation at 600mA?

The minimum input voltage is calculated as VOUT + VDROPOUT = 3.9V + 0.3V = 4.2V. At 600mA and TA = +25°C, the typical dropout is 300mV; the datasheet specifies max 400mV for VOUT ≥ 2.5V, so 4.3V ensures margin across temperature and process variation.

Can AP7365-39WG-7 operate without an output capacitor?

No. The device requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability. Omitting it causes oscillation and output voltage collapse under load, as confirmed in the "Output Capacitor" section of DS32260 Rev. 10–2, page 8.

Is the NC pin on AP7365-39WG-7 internally connected or should it be grounded?

Pin 4 is explicitly designated "NC" (No Connection) in the Pin Descriptions table (page 3). It is not bonded internally and must remain unconnected; grounding it may compromise thermal performance or cause unintended leakage paths per Diodes' layout guidance.

How does the EN pin behave during power-up when VIN ramps slowly?

The EN pin has hysteresis-free thresholds: VIH = 1.4V (min), VIL = 0.4V (max). If VIN rises before EN, the device remains off until EN exceeds 1.4V. If EN tracks VIN, turn-on occurs once both reach ≥1.4V-no special sequencing circuitry is needed per Application Information section, page 9.