Diodes Incorporated AP7343D-10W5-7

Overview

AP7343D-10W5-7 from Diodes Incorporated is a 300mA, 1.0V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ±1% output voltage accuracy, 60µVrms output noise (10Hz–100kHz), and ultra-low quiescent current (35µA typical). It features enable control, thermal shutdown, short-circuit protection, and is optimized for RF supply rails in compact portable electronics using the SOT25 package.

For engineers reviewing the AP7343D-10W5-7 datasheet, AP7343D-10W5-7 pinout, AP7343D-10W5-7 application, or AP7343D-10W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.46–0.72V depending on VOUT), EN logic thresholds (0.5V low / 1.3V high), thermal resistance (179°C/W in SOT25), and built-in discharge functionality enabled by the "D" suffix.

Technical Context

The AP7343D-10W5-7 employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit, and thermal shutdown circuitry. Its enable input (EN) provides precise on/off control with defined logic thresholds and sub-1µA standby current when disabled.

It delivers stable 1.0V output across –40°C to +85°C ambient, supports input voltages from 1.7V to 5.25V, and maintains regulation under fast load transients (e.g., 1mA ↔ 300mA steps) with minimal output deviation when paired with 1µF ceramic output capacitance.

Key Specifications

Pinout & Package

AP7343D-10W5-7 is housed in the SOT25 (SC-74A) 5-pin surface-mount package - a compact, thermally enhanced leaded package with exposed pad for improved heat dissipation. Pin 4 is NC (no connection); pin 5 is the exposed thermal pad, recommended to be connected to GND via large copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1002E/MB and XC6210B102MR-G, the AP7343D-10W5-7 uniquely combines discharge functionality, highest PSRR (75dB), and validated 300mA performance in SOT25 - making it optimal for RF and fast-wake systems where output settling and noise immunity are design-critical.

Availability

AP7343D-10W5-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, mobile camera sensor core supplies, wireless adapter baseband ICs, and portable media player audio codecs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7343D-10W5-7 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 protection solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line-designed specifically for noise-sensitive applications in portable communications equipment where small footprint, low IQ, and fast transient response are mandatory.

FAQ

What is the purpose of the "D" suffix in AP7343D-10W5-7?

The "D" denotes integrated output discharge functionality: when the EN pin is driven low, an internal 30Ω NMOS transistor actively discharges the VOUT node to GND. This prevents floating outputs and ensures predictable power-down behavior in systems with multiple supply domains or strict sequencing requirements.

Can AP7343D-10W5-7 operate with input voltage below 1.7V?

No. The absolute minimum input voltage is 1.7V per datasheet specifications. Below this threshold, regulation fails and output voltage collapses. For sub-1.7V operation, consider Diodes' AP7361 series (1.0V min VIN) or alternative ultra-low-VIN LDOs with verified performance down to 0.7V.

Is the exposed pad (EP) on the SOT25 package electrically connected?

No-the exposed pad is thermally conductive but electrically isolated. It must be soldered to a large GND copper pour for thermal dissipation, but should not serve as the primary GND connection. Pin 2 remains the sole functional ground terminal; EP improves θ_JA to 179°C/W but carries no current.

How does AP7343D-10W5-7 behave during output short-circuit events?

Under VOUT-to-GND short, the device activates fold-back current limiting, clamping output current to ~55mA. Thermal shutdown engages if junction temperature exceeds +150°C. Once fault clears, the regulator automatically recovers-no manual reset or external circuitry required.