Diodes Incorporated AP7343D-22W5-7

Overview

AP7343D-22W5-7 from Diodes Incorporated is a 300mA, 2.2V fixed-output low-dropout linear regulator (LDO) with high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), ±1% output voltage accuracy, and enable control. Fabricated on a CMOS process, it delivers stable power to noise-sensitive RF supplies and portable media subsystems operating from 1.7V to 5.25V input rails.

For engineers reviewing the AP7343D-22W5-7 datasheet, AP7343D-22W5-7 pinout, AP7343D-22W5-7 application, or AP7343D-22W5-7 equivalent, key selection criteria include dropout voltage (≤290mV at 300mA for 2.2V output), thermal shutdown threshold (+150°C), EN logic thresholds (V_IL ≤0.5V, V_IH ≥1.3V), and SOT25 package compatibility with space-constrained PCB layouts.

Technical Context

The AP7343D-22W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection in a single CMOS LDO architecture. Its internal discharge FET (enabled by the 'D' suffix) actively pulls down VOUT during shutdown, eliminating residual voltage hold-up in battery-powered systems.

It operates across –40°C to +85°C ambient, supports 1.7V–5.25V input, and maintains regulation under fast load transients (e.g., 1mA ↔ 300mA steps) with minimal output deviation when paired with 1µF ceramic C_OUT. The device exhibits 35µA quiescent current and 0.01µA standby current, enabling multi-day operation in always-on sensor nodes.

Key Specifications

Pinout & Package

AP7343D-22W5-7 is packaged in the SOT25 (5-pin, 2.9mm × 1.6mm) surface-mount package, optimized for compact portable designs. The exposed pad (EP) is thermally connected to GND for enhanced 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 MCP1703T-2202E/MB and XC6210B221MR-G, AP7343D-22W5-7 uniquely combines 300mA drive, 75dB PSRR, integrated discharge, and 35µA IQ-making it optimal for battery-powered RF and imaging subsystems demanding both precision regulation and intelligent power sequencing.

Availability

AP7343D-22W5-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera sensor core supplies, wireless audio codec regulation, and low-power MCU I/O rail generation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP7343D-22W5-7 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, with design centers across Asia, Europe, and the US, serving automotive, industrial, computing, and consumer markets.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-critical portable electronics where PSRR, output accuracy, and ultra-low quiescent current are essential for battery longevity and signal integrity.

FAQ

What is the purpose of the NC pin (Pin 5) in the SOT25 package?

Pin 5 is a no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected on the PCB-neither tied to GND nor routed to any net. This pin exists solely for mechanical symmetry and thermal uniformity in the SOT25 mold compound; connecting it risks unintended parasitic coupling or solder bridging.

Does AP7343D-22W5-7 require an external discharge resistor?

No. The 'D' suffix indicates integrated discharge functionality: an internal 30Ω NMOS FET connects VOUT to GND when EN is low. This eliminates the need for external resistors, saves board area, and ensures consistent discharge timing (<100µs to <100mV) across temperature and unit variation.

Can AP7343D-22W5-7 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 high di/dt load transients (e.g., burst-mode RF transmission), a 1µF capacitor is recommended to maintain input stability and reduce voltage droop below the 1.7V UVLO threshold.

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

SOT25 has R_θJA = 179°C/W, while X2-DFN1010-4 (Type B) measures 237°C/W on standard JEDEC boards. The SOT25's larger copper exposure and leadframe design provide superior heat spreading-enabling 300mA continuous operation at +85°C ambient without derating, unlike the smaller DFN variant.