Diodes Incorporated AP7343D-295W5-7

Overview

AP7343D-295W5-7 from Diodes Incorporated is a 300mA, 2.95V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), ±1% output voltage accuracy, and 35µA quiescent current. It features enable control, thermal shutdown, short-circuit protection, and is optimized for RF supply rails and portable media subsystems in space-constrained designs.

For engineers reviewing the AP7343D-295W5-7 datasheet, AP7343D-295W5-7 pinout, AP7343D-295W5-7 application, or AP7343D-295W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V for V_OUT = 2.95V in SOT25), EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and thermal resistance (R_θJA = 179°C/W in SOT25) for handheld thermal management.

Technical Context

The AP7343D-295W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its enable input provides precise on/off control without floating-state risk, and the internal discharge FET (enabled by the "D" suffix) actively discharges V_OUT during shutdown to prevent back-powering.

This variant uses a fixed 2.95V output set by an internal resistor network and supports input voltages from 1.7V to 5.25V. The SOT25 package enables compact PCB layouts while delivering stable regulation under fast load transients (e.g., 1mA ↔ 300mA step response with <100mV undershoot/overshoot using 1µF C_OUT).

Key Specifications

Pinout & Package

AP7343D-295W5-7 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 1 is VIN, Pin 2 is GND, Pin 3 is EN, Pin 4 is VOUT, and Pin 5 is NC (no connection). The exposed pad (EP) must be connected to GND via large copper area for optimal thermal performance but must not serve as sole GND electrode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2902E/TO and XC6219B292MR-G, AP7343D-295W5-7 uniquely combines 300mA capability, integrated discharge, ±1% accuracy, and 75dB PSRR in SOT25-making it optimal for RF-sensitive, enable-driven, and thermally constrained portable designs.

Availability

AP7343D-295W5-7 is available at Aetrix Electronics and suitable for smartphone RF power management, portable camera sensor bias, wireless audio codec supply, and Bluetooth LE peripheral MCU core applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7343D-295W5-7 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 power management, signal integrity, and connectivity applications.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, designed specifically for low-noise, high-PSRR power delivery in battery-powered portable electronics and RF subsystems.

FAQ

What is the minimum input voltage required for AP7343D-295W5-7 to maintain regulation at 300mA?

The minimum input voltage is determined by dropout: for V_OUT = 2.95V and 300mA load in SOT25, max dropout is 0.31V. Thus, VIN must be ≥ 3.26V to sustain regulation. Below this, output collapses nonlinearly per the dropout curve in Figure 7 of DS37952 Rev. 12–2.

Does AP7343D-295W5-7 require an external pull-up on the EN pin if unused?

No. If enable control is not needed, tie EN directly to VIN-not via a pull-up resistor-to ensure reliable turn-on and avoid leakage-induced partial activation. The datasheet explicitly states that floating EN is prohibited and that direct VIN connection guarantees full functionality without added components.

Can AP7343D-295W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes-stability is guaranteed with ≥0.47µF ceramic capacitors. However, transient response degrades below 1µF: load-step undershoot increases by ~25% at 300mA steps when using 0.47µF vs. 1µF. For RF or high-precision analog loads, 1µF is strongly recommended per the Application Information section.

Is the exposed pad (EP) of the SOT25 package electrically connected to GND internally?

No-the EP is thermally conductive but electrically isolated. It must be externally connected to GND via PCB copper for thermal performance, but it serves no electrical function beyond heat sinking. Using it as the sole GND path violates layout guidelines and risks instability due to increased ground impedance.