Diodes Incorporated AP7343D-285W5-7

Overview

AP7343D-285W5-7 from Diodes Incorporated is a 300mA, 2.85V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), and ±1% output voltage accuracy over temperature. It features CMOS-based architecture, enable control (EN), thermal shutdown, and short-circuit protection - designed for RF supply rails and portable media subsystems where clean, stable biasing is critical.

For engineers reviewing the AP7343D-285W5-7 datasheet, AP7343D-285W5-7 pinout, AP7343D-285W5-7 application, or AP7343D-285W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V), quiescent current (35µA typ.), EN logic thresholds (0.5V_IL/1.3V_IH), and SOT25 package thermal resistance (179°C/W).

Technical Context

The AP7343D-285W5-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit circuit, and thermal shutdown. Its enable input controls NMOS pass transistor gate drive, allowing fast turn-on/turn-off with controlled slew rates.

It delivers 2.85V output with ±1% accuracy across –40°C to +85°C ambient, supports input voltages from 1.7V to 5.25V, and maintains stability with ≥1µF ceramic output capacitance. The device includes fold-back short-circuit protection (≈55mA) and auto-discharge functionality via internal 30Ω N-channel switch when disabled.

Key Specifications

Pinout & Package

AP7343D-285W5-7 is packaged in the SOT25 (SC-74A) 5-pin surface-mount package - compact (2.9mm × 1.6mm × 1.1mm), thermally enhanced with exposed pad (EP) connected to GND for improved heat dissipation (R_θJA = 179°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343D-285W5-7, AP7361D-285W5-7 trades lower IQ for higher current headroom in the same footprint, while MCP1700-2802E/TO sacrifices precision, protection, and controllability for minimal quiescent draw and legacy through-hole compatibility.

Availability

AP7343D-285W5-7 is available at Aetrix Electronics and suitable for smartphone RF supplies, portable camera ISPs, wireless headset audio codecs, and Bluetooth SoC I/O rails requiring stable component supply, automotive-grade traceability, and long-term production continuity.

Supply support for AP7343D-285W5-7 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 for power management, signal integrity, and connectivity applications.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and precise voltage regulation in space-constrained layouts.

FAQ

What is the minimum input voltage required for AP7343D-285W5-7 to regulate 2.85V at 300mA?

The minimum input voltage is determined by dropout voltage: at 300mA and 2.85V output, typical dropout is 0.22V, so VIN(min) = 2.85V + 0.22V = 3.07V. Absolute minimum specified VIN is 1.7V, but regulation fails below 3.07V under full load. Datasheet guarantees operation down to 1.7V only at lighter loads.

Does AP7343D-285W5-7 require an external discharge resistor?

No. The "D" suffix indicates built-in auto-discharge functionality via a 30Ω internal N-channel MOSFET between VOUT and GND. When EN is pulled low, this switch actively discharges the output capacitor, eliminating need for external components and reducing BOM count and PCB area.

Can AP7343D-285W5-7 be used with ceramic output capacitors smaller than 1µF?

The datasheet specifies stability with ≥1µF ceramic output capacitance. Using smaller values (e.g., 0.47µF) may cause instability or excessive ringing under load transients. ESR vs. output current graphs confirm stable operation only within defined ESR range for ≥1µF capacitors - deviation risks oscillation or degraded PSRR.

Is the exposed pad (EP) on the SOT25 package electrically connected internally?

No - the exposed pad is not internally connected to any die node. It serves solely as a thermal interface. Per datasheet layout guidance, it must be soldered to a PCB copper pour tied to GND for optimal thermal performance, but must not be used as a functional GND electrode or signal path.