Diodes Incorporated AP7343-09W5-7

Overview

AP7343-09W5-7 from Diodes Incorporated is a 300mA, 0.9V fixed-output low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). Built on a CMOS process, it features enable control, thermal shutdown, and short-circuit protection, and is optimized for powering RF circuitry and core logic rails in space-constrained portable devices.

For engineers reviewing the AP7343-09W5-7 datasheet, AP7343-09W5-7 pinout, AP7343-09W5-7 application, or AP7343-09W5-7 equivalent, key selection criteria include its 0.9V fixed output, 35µA quiescent current, 0.51V typical dropout at 300mA (SOT25), and compatibility with 1µF ceramic input/output capacitors in high-transient-load scenarios.

Technical Context

The AP7343-09W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor in a CMOS-based architecture. Its enable input (EN) provides precise on/off control with defined logic thresholds (0–0.5V low, 1.3–5.25V high), and it includes fold-back short-circuit protection clamping output current to ~55mA under VOUT-to-GND fault.

Thermal management relies on internal shutdown at +150°C with +20°C hysteresis, and its SOT25 package delivers 179°C/W junction-to-ambient thermal resistance. The device operates across –40°C to +85°C ambient, supports input voltages from 1.7V to 5.25V, and maintains ±30ppm/°C output voltage temperature coefficient.

Key Specifications

Pinout & Package

SOT25 (5-pin, 2.9mm × 1.6mm) package with exposed thermal pad (EP); pin 1 = VIN, pin 2 = GND, pin 3 = EN, pin 4 = VOUT, pin 5 = NC (no connection). EP must be connected to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-0902E/TO and XC6210B092MR-G, the AP7343-09W5-7 uniquely balances 300mA drive strength, 1.7V minimum input, and 35µA quiescent current-making it optimal for modern single-cell Li-ion systems demanding both performance and efficiency.

Availability

AP7343-09W5-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, mobile processor core rails, CMOS image sensor analog supplies, and low-power IoT microcontroller I/O domains requiring stable component supply and rapid design-in support.

Supply support for AP7343-09W5-7 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for noise-sensitive portable electronics where compact size, low IQ, and robust transient response are mandatory.

FAQ

What is the recommended input and output capacitor configuration for AP7343-09W5-7?

A minimum 0.47µF ceramic capacitor is required between VIN and GND, and a 1µF ceramic capacitor is recommended between VOUT and GND. Both must be placed within 2mm of their respective pins and connected to a solid ground plane. Low-ESR X5R/X7R dielectrics are preferred; avoid high-ESR tantalum or aluminum electrolytics unless bulk capacitance is added in parallel.

Does AP7343-09W5-7 include output discharge functionality?

No. AP7343-09W5-7 is the non-discharge variant (as indicated by absence of "D" in the part number suffix). It does not integrate an internal pull-down transistor on VOUT. For applications requiring rapid output discharge during shutdown, select AP7343D-09W5-7 instead.

Can AP7343-09W5-7 operate with a 1.5V input supply?

No. The absolute minimum input voltage is 1.7V per datasheet specifications. At 0.9V output, the minimum functional input is 1.7V, resulting in only 0.8V headroom-insufficient to maintain regulation given its 0.51V typical dropout. A 1.8V or higher input is required for reliable 300mA operation.

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

The SOT25 package has a junction-to-ambient thermal resistance (R_θJA) of 179°C/W, while the X2-DFN1010-4 (Type B) measures 237°C/W on the JEDEC High-K board. However, the DFN's exposed pad allows superior PCB-level thermal conduction when soldered to large copper areas-enabling higher sustained current in thermally optimized layouts despite its higher R_θJA.