Diodes Incorporated AP7343Q-29W5-7

Overview

AP7343Q-29W5-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 2.9V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, and short-circuit protection, and is deployed in ADAS camera power rails and infotainment RF supply stages where low noise and AEC-Q100 compliance are mandatory.

For engineers reviewing the AP7343Q-29W5-7 datasheet, AP7343Q-29W5-7 pinout, AP7343Q-29W5-7 application, or AP7343Q-29W5-7 equivalent, key selection criteria include its 1.7V–5.25V input range, -40°C to +125°C operation, SOT25 package footprint, and guaranteed 300mA output under automotive thermal constraints.

Technical Context

The AP7343Q-29W5-7 uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input provides precise on/off control with 0–0.5V logic-low and 1.3–5.25V logic-high thresholds, and it lacks built-in output discharge (non-D variant).

It delivers stable 2.9V regulation across load currents up to 300mA and input voltages as low as 1.7V, with dropout voltage of 0.22–0.31V depending on output load. Thermal shutdown activates at +150°C with +20°C hysteresis, ensuring robust operation in engine bay and ADAS ECU environments.

Key Specifications

Pinout & Package

AP7343Q-29W5-7 is packaged in SOT25 (5-pin, 2.9mm × 2.8mm), optimized for space-constrained automotive PCBs. The exposed pad is not electrically connected but must be thermally tied to GND copper for junction-to-ambient thermal resistance of 179°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343DQ-29W5-7, the -29W5-7 variant eliminates discharge circuitry to reduce leakage and improve noise floor-critical for RF applications. Versus TLD1121-29ES, it trades current capacity and watchdog for superior PSRR and lower noise, making it optimal for precision analog power domains.

Availability

AP7343Q-29W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics systems requiring stable component supply with full AEC-Q100 traceability and PPAP support.

Supply support for AP7343Q-29W5-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with ISO/TS 16949-certified fabrication and assembly facilities.

The AP7343Q belongs to Diodes' automotive-qualified LDO portfolio, designed specifically for noise-sensitive power domains in ADAS, infotainment, and body electronics where AEC-Q100 reliability and low-noise regulation are non-negotiable.

FAQ

What is the maximum allowable input voltage for AP7343Q-29W5-7?

The absolute maximum input voltage is 6.0V per datasheet Absolute Maximum Ratings. However, recommended operation is limited to 1.7V–5.25V. Exceeding 5.25V risks permanent damage even momentarily, especially during load dump events; external clamping or pre-regulation is required above this limit.

Does AP7343Q-29W5-7 require an external output capacitor?

Yes-a minimum 1.0µF ceramic capacitor is required between VOUT and GND, placed within 3mm of the pins. This stabilizes the control loop, improves load transient response, and prevents oscillation. Lower ESR capacitors (<10mΩ) are preferred for high-dynamic applications like camera auto-exposure bursts.

How does the EN pin behave during power-up sequences?

The EN pin must exceed 1.3V to enable regulation; below 0.5V, the device enters shutdown with <1.0µA standby current. During slow-rising VIN, EN should be held low until VIN stabilizes to prevent brown-out glitches. A simple RC delay or dedicated supervisor IC ensures reliable sequencing.

Is thermal derating required for AP7343Q-29W5-7 in SOT25 at 300mA?

Yes-SOT25 has θ_JA = 179°C/W. At 300mA and 2.9V output with 5.25V input, power dissipation reaches ~700mW, raising junction temperature by ~125°C above ambient. Derate output current to ≤150mA at +85°C ambient or add ≥2cm² copper pour under the exposed pad to maintain TJ < +125°C.