Diodes Incorporated AP7343-12W5-7

Overview

AP7343-12W5-7 from Diodes Incorporated is a 300mA, 1.2V 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-designed for powering RF circuitry and precision analog blocks in space-constrained portable devices.

For engineers reviewing the AP7343-12W5-7 datasheet, AP7343-12W5-7 pinout, AP7343-12W5-7 application, or AP7343-12W5-7 equivalent, key selection criteria include its 1.7V–5.25V input range, 35µA quiescent current, 0.39V typical dropout at 300mA (1.2V output), and SOT25 package compatibility with high-density PCB layouts.

Technical Context

The AP7343-12W5-7 integrates a 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 internal thermal shutdown activates at +150°C with +20°C hysteresis.

It delivers stable 1.2V output across –40°C to +85°C ambient, with load regulation of ≤30mV from 1mA to 300mA and line regulation of ≤0.1%/V. The device supports fast transient response-demonstrated in load-step tests from 1mA ↔ 300mA-with minimal output deviation when paired with 1µF ceramic C_OUT.

Key Specifications

Pinout & Package

AP7343-12W5-7 is supplied in the SOT25 (SC-74A) 5-pin surface-mount package-compact (2.9mm × 2.8mm × 1.3mm), thermally enhanced, and RoHS-compliant. The exposed pad (EP) is not electrically connected but must be soldered to a large GND copper area for optimal thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1202E/MB and XC6210B122MR-G, AP7343-12W5-7 uniquely balances 300mA drive, ±1% accuracy, robust thermal protection, and industry-leading PSRR/noise trade-off-making it optimal for RF and imaging subsystems demanding both headroom and cleanliness.

Availability

AP7343-12W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, mobile camera sensor core supply, wireless adapter baseband ICs, and portable media player audio codec applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AP7343-12W5-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for low-power portable electronics where PSRR, noise, and footprint are critical-targeting smartphones, tablets, and wireless infrastructure.

FAQ

What is the minimum input voltage required for AP7343-12W5-7 to maintain regulated 1.2V output at 300mA?

The typical dropout voltage is 0.46V at 300mA and +25°C, so minimum input is 1.2V + 0.46V = 1.66V. At worst-case (85°C, SOT25), dropout reaches 0.72V per datasheet, requiring VIN ≥ 1.92V for guaranteed regulation under full load and temperature stress.

Can AP7343-12W5-7 be used without an external enable signal?

Yes-tie the EN pin directly to VIN to keep the regulator permanently enabled. This configuration eliminates external control but retains all other functionality including thermal shutdown and short-circuit protection. Do not leave EN floating, as that may cause erratic operation.

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

No-the EP is a non-electrical thermal pad. It must be soldered to a large GND copper pour for heat dissipation but serves no signal or power function. Connecting it to GND improves θ_JA by ~15°C/W but does not create a functional ground connection for the IC.

How does AP7343-12W5-7 behave during output short-circuit events?

When VOUT is shorted to GND, the internal current limit triggers and clamps output current to ~55mA. This fold-back behavior reduces power dissipation and prevents thermal runaway. The device remains operational after fault removal and does not latch off-no manual reset is needed.