Diodes Incorporated AP7343D-25W5-7

Overview

AP7343D-25W5-7 from Diodes Incorporated is a 300mA, 2.5V 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 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-25W5-7 datasheet, AP7343D-25W5-7 pinout, AP7343D-25W5-7 application, or AP7343D-25W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.25–0.32V depending on package), quiescent current (35µA typ), EN logic thresholds (0.5V low / 1.3V high), and discharge functionality enabled by the "D" suffix.

Technical Context

The AP7343D-25W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge capability activated upon shutdown. Its CMOS architecture enables low quiescent current while maintaining fast load transient response - critical for powering sensitive RF ICs and camera modules where supply ripple directly impacts signal integrity.

It supports two package variants: SOT25 (R_θJA = 179°C/W) and X2-DFN1010-4 (Type B) (R_θJA = 237°C/W), both featuring an exposed pad for thermal enhancement. The "D" suffix confirms integrated discharge path (30Ω typical ON-resistance), ensuring rapid VOUT decay during disable to prevent back-powering of downstream circuitry.

Key Specifications

Pinout & Package

AP7343D-25W5-7 is packaged in SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm), with pin 1 (VIN) and pin 5 (VOUT) positioned diagonally for optimal PCB routing. The exposed pad (EP) must be connected to GND via thermal vias for reliable operation above 150mA continuous load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and XC6219B252MR-G, AP7343D-25W5-7 uniquely combines 300mA capability, 75dB PSRR, 60µVrms noise, and integrated discharge - making it the only drop-in solution for space-constrained, multi-rail wireless audio and RF modules requiring fast, safe shutdown behavior.

Availability

AP7343D-25W5-7 is available at Aetrix Electronics and suitable for RF transceiver power, camera sensor bias, portable media decoder, and wireless audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7343D-25W5-7 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 RF and imaging applications in portable electronics - emphasizing small footprint, fast transient response, and robust thermal performance.

FAQ

What is the purpose of the NC pin on AP7343D-25W5-7?

Pin 4 is designated NC (No Connection) and is internally unconnected. It must remain unconnected on the PCB layout to prevent unintended coupling, parasitic capacitance, or potential latch-up. This pin exists for mechanical compatibility with other variants in the AP7343 family but carries no electrical function in this specific part.

Does AP7343D-25W5-7 require an external discharge resistor?

No. The "D" suffix indicates integrated auto-discharge functionality via an internal 30Ω NMOS switch between VOUT and GND. When EN is pulled low, this path actively discharges the output capacitor, eliminating the need for external components and reducing BOM count and board area in space-constrained designs.

Can AP7343D-25W5-7 operate with only a 0.47µF input capacitor?

Yes - the datasheet specifies a minimum 0.47µF ceramic capacitor between VIN and GND. However, for applications with large load transients (e.g., burst-mode RF transmission), a 1µF or larger input capacitor is recommended to limit VIN droop and maintain regulation stability during fast current steps.

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

SOT25 offers lower junction-to-ambient thermal resistance (179°C/W vs. 237°C/W for X2-DFN1010-4), enabling higher continuous current capability at elevated ambient temperatures. However, the X2-DFN1010-4 provides superior board-level thermal conduction via its exposed pad - advantageous in dense layouts where airflow is restricted and copper area is maximized.