Diodes Incorporated AP7343-25W5-7

Overview

AP7343-25W5-7 from Diodes Incorporated is a 300mA, 2.5V fixed-output low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, and short-circuit protection - deployed in RF supply rails and portable media player core logic.

For engineers reviewing the AP7343-25W5-7 datasheet, AP7343-25W5-7 pinout, AP7343-25W5-7 application, or AP7343-25W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.25–0.32V), quiescent current (35–60µA), EN input thresholds (0–0.5V low / 1.3–5.25V high), and SOT25 thermal resistance (179°C/W).

Technical Context

The AP7343-25W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - delivering stable 2.5V output across -40°C to +85°C ambient. Its architecture supports fast load transient response (<100µs recovery) and enables low-noise biasing for sensitive analog/RF stages.

It operates from 1.7V to 5.25V input, with EN pin controlling on/off state via TTL- or CMOS-compatible logic levels. The device includes fold-back short-circuit protection (≈55mA limit) and thermal shutdown at +150°C with +20°C hysteresis - ensuring robust operation under fault conditions.

Key Specifications

Pinout & Package

AP7343-25W5-7 uses the SOT25 (5-pin) package - compact, surface-mount, and optimized for thermal performance (R_θJA = 179°C/W). Pin 1 is VIN, Pin 2 is GND, Pin 3 is EN, Pin 4 is VOUT, and Pin 5 is NC (no connection). The exposed pad (EP) must be connected to GND for optimal thermal dissipation but not used as sole GND electrode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2502E/TO and XC6210B252MR-G, AP7343-25W5-7 uniquely combines 300mA drive, 35µA IQ, integrated EN, thermal shutdown, and 75dB PSRR - making it optimal for space-constrained, thermally demanding, and noise-sensitive portable RF systems.

Availability

AP7343-25W5-7 is available at Aetrix Electronics and suitable for smartphone baseband power, RF front-end bias, and portable media player audio core applications requiring stable component supply, long-term lifecycle support, and automotive-grade traceability options (via AP7343Q variant).

Supply support for AP7343-25W5-7 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 leadership in power management, signal integrity, and protection solutions for high-volume electronics markets.

The AP7343 series targets portable and battery-powered systems, emphasizing ultra-low IQ, high PSRR, and small-footprint packaging to meet stringent size and efficiency demands in mobile and wireless devices.

FAQ

What is the minimum input voltage required for AP7343-25W5-7 to regulate 2.5V output at 300mA?

The minimum input voltage is 2.75V - derived from the maximum dropout voltage of 0.32V at 300mA (SOT25 package) added to the nominal 2.5V output. Below this, regulation fails and VOUT drops linearly with VIN. Operation down to 1.7V is supported only at reduced load currents.

Can AP7343-25W5-7 be used without an external enable signal?

Yes - tie the EN pin directly to VIN to maintain continuous operation. This configuration disables shutdown mode but preserves all other functions including thermal and short-circuit protection. Do not leave EN floating, as it may cause erratic turn-on behavior.

Is the NC pin on AP7343-25W5-7 electrically isolated or internally connected?

The NC pin (Pin 5) is electrically isolated - no internal connection exists. It serves only mechanical anchoring and thermal relief. While it may be tied to GND for improved solder joint reliability, doing so provides no electrical benefit and must not substitute for the dedicated GND (Pin 2) connection.

How does the AP7343-25W5-7 handle output short-circuit events?

Under VOUT-to-GND short, the device activates fold-back current limiting, clamping output current to ≈55mA. This reduces power dissipation and prevents thermal runaway. Recovery is automatic once the short is removed - no latch or manual reset is required.