Diodes Incorporated AP7343D-30W5-7

Overview

AP7343D-30W5-7 from Diodes Incorporated is a 300mA, 3.0V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), and ±1% output voltage accuracy over temperature. Built on a CMOS process, it features enable control, thermal shutdown, short-circuit protection, and operates from 1.7V to 5.25V input-optimized for RF supply rails in portable wireless devices.

For engineers reviewing the AP7343D-30W5-7 datasheet, AP7343D-30W5-7 pinout, AP7343D-30W5-7 application, or AP7343D-30W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V), quiescent current (35µA typ), EN logic thresholds (0.5V low / 1.3V high), and thermal resistance (179°C/W in SOT25).

Technical Context

The AP7343D-30W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with built-in auto-discharge functionality (indicated by "D" suffix). Its CMOS architecture enables low quiescent current while maintaining fast load transient response (<100µs settling) and stable operation with 1µF ceramic output capacitors.

It delivers 3.0V output with ±1% accuracy across –40°C to +85°C ambient, supports 300mA guaranteed output current, and includes thermal shutdown (150°C trigger, 20°C hysteresis) and fold-back short-circuit protection (~55mA). The device is rated for 6.0V absolute max input and features 2kV HBM ESD protection.

Key Specifications

Pinout & Package

AP7343D-30W5-7 uses the SOT25 (SC-74A) 5-pin package-compact (2.9mm × 1.6mm × 1.1mm), thermally enhanced with exposed pad connected to GND for improved heat dissipation (RθJA = 179°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3002E/TT and XC6206P302MR-G, AP7343D-30W5-7 uniquely combines 300mA capability, ±1% accuracy, 60µVrms noise, EN control, auto-discharge, and thermal shutdown in a 5-pin SOT25-making it optimal for space-constrained, battery-powered RF systems demanding full protection and precision.

Availability

AP7343D-30W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, wireless transceiver core supply, camera module sensor rails, and portable media player audio codec applications requiring stable component supply, automotive-grade reliability (via AP7343Q variant), and long-term production continuity.

Supply support for AP7343D-30W5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO portfolio-designed specifically for noise-sensitive portable electronics where clean, efficient, and protected power delivery is essential.

FAQ

What is the purpose of the NC pin (PIN5) in the SOT25 package?

PIN5 is a no-connect terminal with no internal bond wire or circuit connection. It serves solely as a mechanical anchor for the package during PCB assembly and reflow. Diodes Incorporated explicitly states it must not be used as a functional node; connecting it to GND is permissible only for mechanical stability-not for thermal or electrical purposes.

Does AP7343D-30W5-7 require an external discharge resistor for VOUT?

No. The "D" suffix indicates integrated auto-discharge functionality: when EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, discharging the output capacitor in under 1ms. This eliminates need for external resistors, reduces BOM count, and ensures predictable shutdown behavior in battery-powered systems.

Can AP7343D-30W5-7 operate with input voltage below 3.0V?

Yes-down to 1.7V-but output regulation is only maintained when VIN ≥ (VOUT + dropout voltage). At 300mA load, dropout is 0.22–0.29V, so minimum functional VIN is ~3.22V. Below that, VOUT drops linearly; however, the device remains powered and functional for partial-load or standby conditions with VIN as low as 1.7V.

How does the thermal performance differ between SOT25 and X2-DFN1010-4 packages?

SOT25 has RθJA = 179°C/W, while X2-DFN1010-4 (Type B) is 237°C/W-meaning SOT25 dissipates heat more effectively in standard PCB layouts. This is due to SOT25's larger copper exposure and optimized thermal pad design. For 300mA continuous operation at 85°C ambient, SOT25 allows higher power budget before reaching 125°C junction limit.