Diodes Incorporated AP7343D-15W5-7

Overview

AP7343D-15W5-7 from Diodes Incorporated is a 300mA low-dropout linear regulator with fixed 1.5V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in portable wireless communication devices using the SOT25 package.

For engineers reviewing the AP7343D-15W5-7 datasheet, AP7343D-15W5-7 pinout, AP7343D-15W5-7 application, or AP7343D-15W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.46V typ), enable threshold compatibility (1.3V high / 0.5V low), thermal resistance (179°C/W), and discharge functionality for rapid VOUT decay during shutdown.

Technical Context

The AP7343D-15W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_EN(H) = 1.3V min, V_EN(L) = 0.5V max), and the built-in discharge path (enabled by 'D' suffix) actively pulls VOUT to GND when disabled.

It operates across 1.7V–5.25V input range and delivers stable 1.5V output with <±30ppm/°C temperature coefficient. The device features fold-back short-circuit protection (≈55mA clamp) and maintains regulation down to 0.46V dropout at 300mA load in SOT25 package.

Key Specifications

Pinout & Package

AP7343D-15W5-7 uses the SOT25 (5-pin) package with exposed pad (EP) for thermal enhancement. Pin 1 = VIN, Pin 2 = GND, Pin 3 = EN, Pin 4 = VOUT, Pin 5 = NC (no connection). The EP must be connected to GND via large copper pour for optimal thermal dissipation but is not electrically functional as GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1502E/MB and XC6219B152MR-G, AP7343D-15W5-7 uniquely combines ±1% accuracy, 75dB PSRR, active discharge, and 35µA I_Q in SOT25 - making it optimal for RF-biased portable systems requiring fast, clean, and efficient power sequencing.

Availability

AP7343D-15W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera ISP supplies, Bluetooth baseband ICs, and wearable sensor hubs requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7343D-15W5-7 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, with design centers across Asia, Europe, and the US, serving automotive, industrial, and consumer markets.

The AP7343 series targets portable electronics requiring high PSRR, low noise, and compact packaging - specifically engineered for RF, imaging, and wireless connectivity subsystems where power integrity directly impacts signal fidelity.

FAQ

What is the function of the NC pin (Pin 5) in AP7343D-15W5-7?

Pin 5 is a no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected in the PCB layout to prevent unintended coupling or solder bridging. Its presence accommodates mechanical symmetry in the SOT25 mold compound but carries zero electrical function.

Does AP7343D-15W5-7 require an external discharge resistor?

No. The 'D' suffix indicates integrated discharge FET functionality. When EN is pulled low, the internal NMOS actively sinks VOUT to GND, eliminating need for external resistors and reducing board area versus passive RC discharge networks.

Can AP7343D-15W5-7 operate with input voltage below 1.7V?

No. Absolute minimum input voltage is 1.7V per datasheet specifications. Operation below this threshold risks loss of regulation, increased dropout, or undefined behavior. For sub-1.7V inputs, consider alternative LDOs with ultra-low VIN capability or buck-boost architectures.

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

SOT25 has R_θJA = 179°C/W; X2-DFN1010-4 (Type B) is 237°C/W. The SOT25's lower thermal resistance stems from its larger exposed pad and standard JEDEC footprint, enabling better heat transfer to PCB copper - critical for sustained 300mA loads in compact layouts.