Diodes Incorporated AP7343-11W5-7

Overview

AP7343-11W5-7 from Diodes Incorporated is a 300mA, 1.1V fixed-output low-dropout linear regulator with ±1% output accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz), designed for RF supply rails in compact portable electronics. It features CMOS-based architecture, enable control, thermal shutdown, and short-circuit protection.

For engineers reviewing the AP7343-11W5-7 datasheet, AP7343-11W5-7 pinout, AP7343-11W5-7 application, or AP7343-11W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.46–0.70V for 1.1V output), quiescent current (35µA typ.), EN input thresholds (0.5V low / 1.3V high), and SOT25 package thermal resistance (179°C/W).

Technical Context

The AP7343-11W5-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit circuit, and thermal shutdown. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V) and <1.0µA leakage.

It delivers stable 1.1V output across –40°C to +85°C ambient, with load regulation of ≤30mV from 1mA to 300mA and line regulation of ≤0.1%/V. Short-circuit protection limits output current to ~55mA when V_OUT is shorted to GND.

Key Specifications

Pinout & Package

SOT25 (5-pin, 2.9mm × 1.6mm) package with exposed thermal pad; optimized for space-constrained PCB layouts in mobile applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-1102E/TO and XC6210B112MR-G, the AP7343-11W5-7 uniquely balances 75dB PSRR, 60µV_rms noise, 35µA I_Q, and 1.7V input capability-making it optimal for RF-sensitive, battery-constrained portable designs requiring full 1.1V rail stability across voltage and temperature.

Availability

AP7343-11W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, Wi-Fi/Bluetooth baseband core supplies, camera sensor analog rails, and wireless adapter PHY layer power delivery requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP7343-11W5-7 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 for power management, signal integrity, and connectivity applications.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for low-noise, high-PSRR power delivery in space- and power-constrained portable communications equipment.

FAQ

What is the minimum input voltage required for AP7343-11W5-7 to regulate 1.1V output?

The AP7343-11W5-7 requires a minimum input voltage of 1.7V per its recommended operating conditions. At 300mA load, dropout voltage ranges from 0.46V to 0.70V depending on temperature and process variation, meaning VIN must be ≥1.56V to sustain regulation-but 1.7V is the absolute minimum specified to guarantee performance across all conditions including –40°C to +85°C ambient and ±1% output tolerance.

Does AP7343-11W5-7 include an output discharge function?

No. The "-11W5-7" suffix indicates the non-discharge variant (as confirmed by Diodes' ordering guide: blank = non-discharge; "D" = discharge). When disabled via EN pin, the output remains floating-no internal FET discharges C_OUT. For applications requiring rapid V_OUT decay, the AP7343D-11W5-7 variant must be selected instead.

Can AP7343-11W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes-Diodes specifies stability with "very small ceramic output capacitors," and the datasheet confirms stable operation with ≥1µF. While smaller values (e.g., 0.47µF) may work in low-transient applications, 1µF is the recommended minimum to ensure robust load transient response and phase margin across temperature and process corners, especially under 300mA step loads.

How does thermal performance differ between SOT25 and X2-DFN1010-4 packages for AP7343-11W5-7?

The SOT25 package has R_θJA = 179°C/W, while the X2-DFN1010-4 (Type B) has R_θJA = 237°C/W-meaning SOT25 offers superior ambient heat dissipation. However, X2-DFN1010-4 provides lower R_θJC (96°C/W vs. 52°C/W) and better board-level conduction when the exposed pad is soldered to a large copper area tied to GND, making it preferable in thermally dense layouts despite higher junction-to-ambient resistance.