Diodes Incorporated AP7343-15W5-7

Overview

AP7343-15W5-7 from Diodes Incorporated is a 300mA, 1.5V fixed-output low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms 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 in space-constrained portable devices.

For engineers reviewing the AP7343-15W5-7 datasheet, AP7343-15W5-7 pinout, AP7343-15W5-7 application, or AP7343-15W5-7 equivalent, key selection criteria include its 1.7V–5.25V input range, 35µA quiescent current, 0.30V typical dropout at 300mA (V_OUT = 2.5V), SOT25 package footprint, and EN-controlled power sequencing capability.

Technical Context

The AP7343-15W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor in a single CMOS die. Its enable input directly controls the pass device gate via internal logic, supporting fast turn-on/turn-off with minimal overshoot under load transients.

It delivers stable 1.5V output across –40°C to +85°C ambient, with <±30ppm/°C output voltage temperature coefficient and built-in thermal shutdown at +150°C (20°C hysteresis). The regulator is internally compensated for stability with ≥1µF ceramic output capacitors and requires no external compensation components.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with exposed pad for thermal dissipation; pin 1 = VIN, pin 2 = GND, pin 3 = EN, pin 4 = VOUT, pin 5 = NC (no connection). Exposed pad must be connected to PCB ground plane for optimal thermal performance (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 MCP1700-1502E/TO and XC6210B152MR-G, the AP7343-15W5-7 provides superior accuracy (±1% vs. ±2%), higher PSRR (75dB vs. ≤70dB), integrated enable control, and robust thermal/short-circuit protection-making it the preferred choice for RF, imaging, and high-reliability portable systems.

Availability

AP7343-15W5-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, mobile camera sensor core supply, wearable BLE SoC core rails, and USB-C PD controller auxiliary supply requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7343-15W5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO portfolio, designed specifically for noise-sensitive applications in portable communications equipment-including smartphones, tablets, and wireless infrastructure-where power efficiency and signal purity are critical.

FAQ

What is the minimum input voltage required for AP7343-15W5-7 to maintain regulation at 300mA load?

The AP7343-15W5-7 requires a minimum input voltage of 1.82V to sustain 1.5V output at 300mA, based on its maximum dropout voltage of 0.32V under those conditions. Below this threshold, output voltage drops linearly with input; operation below 1.7V is outside absolute maximum ratings and may cause malfunction.

Can AP7343-15W5-7 be used without an enable signal?

Yes-the EN pin can be permanently tied to VIN to keep the regulator continuously enabled. This configuration eliminates external control but retains all other functionality, including thermal shutdown and short-circuit protection. Ensure the tie-point uses a low-impedance trace to avoid voltage drop.

Is the exposed pad on the SOT25 package electrically connected to ground?

No-the exposed pad is thermally conductive but electrically isolated. It must be soldered to a large copper pour connected to the PCB's GND plane solely for heat dissipation (R_θJB = 79.2°C/W). Using it as a functional ground node will compromise thermal performance and may violate internal isolation.

Does AP7343-15W5-7 include output discharge functionality?

No-AP7343-15W5-7 is the non-discharge variant (as indicated by absence of "D" in the part number suffix). When disabled, the output remains floating and does not actively discharge through an internal FET. For automatic VOUT discharge, select AP7343D-15W5-7 instead.