Diodes Incorporated AP7343D-29W5-7

Overview

AP7343D-29W5-7 from Diodes Incorporated is a 300mA, 2.9V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), ±1% output voltage accuracy, and enable-controlled operation in SOT25 package. It delivers stable power to RF circuitry and camera modules in space-constrained portable devices.

For engineers reviewing the AP7343D-29W5-7 datasheet, AP7343D-29W5-7 pinout, AP7343D-29W5-7 application, or AP7343D-29W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.31V), quiescent current (35µA typ), thermal shutdown threshold (+150°C), and built-in discharge functionality for rapid VOUT discharge during shutdown.

Technical Context

The AP7343D-29W5-7 integrates a CMOS-based pass transistor, precision voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V).

It features built-in auto-discharge via an internal 30Ω N-channel MOSFET between VOUT and GND when EN is low, ensuring fast output decay. The regulator maintains stability with 1µF ceramic output capacitance and supports input voltages from 1.7V to 5.25V.

Key Specifications

Pinout & Package

AP7343D-29W5-7 is housed in the SOT25 (SC-74A) 5-pin surface-mount package, featuring exposed pad for thermal enhancement. Pin 1 = VIN, Pin 2 = GND, Pin 3 = EN, Pin 4 = VOUT, Pin 5 = NC (no connection). The exposed pad must be connected to GND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2902E/MB and XC6210B292MR-G, AP7343D-29W5-7 uniquely combines ±1% accuracy, 60µVrms noise, 75dB PSRR, and integrated discharge in a standard SOT25 - making it optimal for RF and imaging subsystems requiring fast, clean power sequencing.

Availability

AP7343D-29W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, CMOS image sensor core supply, wireless adapter baseband IC, and portable media player audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7343D-29W5-7 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 product line, designed specifically for noise-sensitive portable electronics where compact size, battery efficiency, and rapid power sequencing are critical.

FAQ

What is the function of the NC pin on AP7343D-29W5-7?

Pin 5 is designated NC (No Connection) and is not internally bonded. It must remain unconnected in the schematic and layout. While some designs connect it to GND for mechanical stability or thermal conduction, Diodes' datasheet specifies it as non-functional and recommends leaving it floating unless explicitly required by board-level EMI or thermal constraints.

Does AP7343D-29W5-7 require an external discharge resistor?

No. AP7343D-29W5-7 integrates an N-channel MOSFET (R_DS(ON) = 30Ω) between VOUT and GND that activates automatically when EN is pulled low. This eliminates the need for external discharge components and ensures VOUT decays rapidly (<100µs) to near-zero volts, preventing back-powering of upstream circuitry.

Can AP7343D-29W5-7 operate with only a 1µF output capacitor?

Yes. The AP7343D-29W5-7 is internally compensated and stable with a minimum 1µF X5R/X7R ceramic output capacitor. Diodes' datasheet confirms stability across temperature and load conditions using this value, provided the capacitor's ESR remains below 100mΩ - a typical specification for standard 0603/0805 ceramic capacitors.

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

In SOT25, θ_JA = 179°C/W and θ_JC = 52°C/W; in X2-DFN1010-4 (Type B), θ_JA = 237°C/W and θ_JC = 96°C/W. The SOT25 offers superior junction-to-ambient dissipation due to its larger copper leadframe and better PCB heat spreading - making it preferable for 300mA continuous loads without additional thermal vias or copper area.