Diodes Incorporated AP7343Q-28W5-7

Overview

AP7343Q-28W5-7 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive-compliant 300mA low-dropout regulator with fixed 2.8V output, ±1% accuracy over -40°C to +125°C, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It features CMOS-based architecture, enable control, thermal shutdown, and short-circuit protection-designed for noise-sensitive power rails in ADAS camera modules and infotainment RF supplies.

For engineers reviewing the AP7343Q-28W5-7 datasheet, AP7343Q-28W5-7 pinout, AP7343Q-28W5-7 application, or AP7343Q-28W5-7 equivalent, key selection criteria include its 0.30V dropout at 300mA (2.8V output), 35µA quiescent current, SOT25 package with wettable flanks, and guaranteed operation across automotive temperature and supply voltage ranges (1.7V–5.25V).

Technical Context

The AP7343Q-28W5-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit circuit, and thermal shutdown. Its fixed 2.8V output is achieved via internal resistor network-no external feedback required.

It supports fast load transient response (±30mV deviation with 1mA↔300mA step, C_OUT=1µF) and line transient suppression (±10mV deviation with 2.8V→5.25V input step), enabled by low output impedance and high PSRR up to 75dB at 1kHz-critical for powering RF receivers and image sensors where supply ripple directly impacts SNR.

Key Specifications

Pinout & Package

AP7343Q-28W5-7 is packaged in SOT25 (JEDEC TO-236AB), a 5-pin surface-mount package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-28W5-7, AP7361Q-28W5-7 trades lower dropout and smaller footprint for higher current capacity, while TLD6512-2V8 adds safety features at the cost of noise performance and current capability-making AP7343Q-28W5-7 optimal for noise-sensitive, space-constrained ADAS imaging rails.

Availability

AP7343Q-28W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera systems, and wireless communication modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for AP7343Q-28W5-7 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 devices, with design, manufacturing, and test facilities certified to IATF 16949 for automotive-grade products.

The AP7343Q series belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for noise-sensitive point-of-load regulation in ADAS, infotainment, and telematics systems where PSRR, low noise, and thermal robustness are critical.

FAQ

What is the maximum allowable input voltage for AP7343Q-28W5-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating the specified dropout margin and may trigger thermal shutdown under load. Operation at 5.25V is validated for full 300mA output at +125°C ambient.

Does AP7343Q-28W5-7 require an external discharge transistor?

No. The "Q" suffix denotes the non-discharge variant-output voltage decays naturally through the load when disabled. Unlike the "DQ" version, it lacks an internal NMOS discharge path, eliminating reverse current flow but resulting in slower VOUT decay (tens of milliseconds depending on load capacitance).

Can AP7343Q-28W5-7 be used with ceramic output capacitors less than 1µF?

Yes-stability is guaranteed with 1µF ceramic capacitors, but the datasheet confirms operation down to 0.47µF for space-constrained layouts. Using <1µF increases susceptibility to load transients; for 300mA step loads, 1µF is strongly recommended to maintain ±30mV regulation window.

How does the NC pin affect thermal performance in SOT25?

The NC pin (Pin 5) is internally unconnected but thermally coupled to the die. Connecting it to GND expands the copper pour area beneath the package, reducing θ_JA by ~5°C/W in standard JEDEC 2-layer boards-improving power dissipation margin by ~15% at 300mA in +85°C ambient.