Diodes Incorporated AP7347D-15W5-7

Overview

AP7347D-15W5-7 from Diodes Incorporated is a 1.5V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It features CMOS-based architecture, enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality. Designed for noise-sensitive automotive and portable electronics, it operates from 1.7V to 5.5V input and delivers stable 1.5V power to microcontrollers, sensors, and RF circuitry.

For engineers reviewing the AP7347D-15W5-7 datasheet, AP7347D-15W5-7 pinout, AP7347D-15W5-7 application, or AP7347D-15W5-7 equivalent, key selection criteria include dropout voltage at 500mA (0.55–0.66V for 1.4V ≤ V_OUT < 1.7V), quiescent current (60µA typ), EN logic thresholds (0.5V max low, 1.25V min high), and thermal resistance (140°C/W in SOT25).

Technical Context

The AP7347D-15W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its CMOS process enables ultra-low quiescent current and high PSRR across 1kHz–100kHz frequencies.

Enable control is implemented via a dedicated EN pin with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.25V) and sub-1µA leakage; internal thermal shutdown activates at +170°C with +20°C hysteresis, and short-circuit foldback limits output current to ~180mA during V_OUT-to-GND faults.

Key Specifications

Pinout & Package

SOT25 (Type A1) package: 5-pin surface-mount with exposed pad not present; footprint optimized for compact layout and thermal dissipation via PCB copper area under pins 2 (GND) and 4 (NC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1502E/MB and TLC7603IDBVR, AP7347D-15W5-7 uniquely combines 500mA drive, 75dB PSRR, 60µV_rms noise, and automotive-ready thermal performance in a 5-pin SOT25 package-making it optimal for next-generation embedded systems requiring both precision and robustness.

Availability

AP7347D-15W5-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical monitoring devices, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for AP7347D-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 ICs for power management, signal integrity, and connectivity applications.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-critical automotive, industrial, and portable electronics where clean, accurate, and sequenced power delivery is essential.

FAQ

What is the minimum input voltage required for AP7347D-15W5-7 to regulate 1.5V at 500mA?

The minimum input voltage is determined by dropout voltage: at 500mA and 1.5V output, the datasheet specifies 0.55–0.66V dropout for 1.4V ≤ V_OUT < 1.7V. Therefore, VIN must be ≥ 2.05V (1.5V + 0.55V) to maintain regulation under full load. Below this, output voltage sags proportionally.

Does AP7347D-15W5-7 require an external pull-up on the EN pin for default-on operation?

No external pull-up is required. The EN pin can be directly tied to VIN to ensure continuous operation. This method guarantees the EN voltage exceeds the 1.25V minimum high threshold across the full 1.7V–5.5V input range, eliminating risk of unintended shutdown due to weak pull-up sources.

Can AP7347D-15W5-7 be used without the NC pin connected?

The NC pin (Pin 4 in SOT25) has no internal connection and may be left unconnected, but Diodes recommends tying it to GND. Doing so improves thermal dissipation through additional PCB copper and reduces EMI susceptibility-especially beneficial in high-density layouts near RF sections or switching regulators.

Is the 60µV_rms output noise specification measured with specific capacitor types or values?

Yes-the 60µV_rms noise is measured with C_IN = C_OUT = 1.0µF ceramic capacitors, at V_OUT = 1.0V and I_OUT = 50mA, across 10Hz–100kHz bandwidth. Using low-ESR X5R/X7R ceramics is critical; higher-ESR capacitors or tantalum types increase measured noise and may degrade transient response.