Diodes Incorporated AP7343Q-185W5-7

Overview

AP7343Q-185W5-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 1.85V 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 designed for noise-sensitive power rails in ADAS camera modules and infotainment RF supplies.

For engineers reviewing the AP7343Q-185W5-7 datasheet, AP7343Q-185W5-7 pinout, AP7343Q-185W5-7 application, or AP7343Q-185W5-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, SOT25 package with 5-pin layout, 1.7V–5.25V input range, and guaranteed 300mA output under -40°C to +125°C ambient conditions.

Technical Context

The AP7343Q-185W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown logic. Its architecture delivers fast load transient response (<100µs settling for 1mA↔300mA steps) and stable operation with 1µF ceramic output capacitors.

It operates across 1.7V–5.25V input while maintaining 1.85V output with ±1% tolerance over temperature and load. The enable input (EN) supports active-high control with 0–0.5V low threshold and 1.3–5.25V high threshold, enabling precise system-level power sequencing in automotive domains.

Key Specifications

Pinout & Package

AP7343Q-185W5-7 is packaged in SOT25 - a 5-pin, surface-mount plastic package with exposed pad not present (unlike W-DFN variants). Pin 1 is VIN, Pin 2 is EN, Pin 3 is GND, Pin 4 is VOUT, and Pin 5 is NC (no connect, recommended tied to GND for thermal enhancement).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B185MR-G and RT9080ALGQW, the AP7343Q-185W5-7 uniquely combines AEC-Q100 Grade 1 qualification, 300mA drive, and 75dB PSRR in a single SOT25 package-enabling drop-in deployment in production automotive ECUs without redesign or qualification revalidation.

Availability

AP7343Q-185W5-7 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, ADAS camera modules, and vehicle-to-everything (V2X) RF subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AP7343Q-185W5-7 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, with design centers across Asia, Europe, and the US and ISO/TS 16949-certified wafer fabrication and assembly facilities.

The AP7343Q series belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for noise-sensitive point-of-load regulation in ADAS, infotainment, and body electronics where reliability, low noise, and AEC-Q100 compliance are mandatory.

FAQ

What is the maximum allowable input voltage for AP7343Q-185W5-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may degrade long-term reliability or trigger overvoltage protection in some board-level implementations. Operation above 5.25V is not characterized per datasheet specifications.

Can the NC pin be left floating on the AP7343Q-185W5-7 in SOT25?

No - the NC pin (Pin 5) must be connected to GND. Although internally unconnected, tying it to ground improves thermal dissipation via PCB copper and reduces electromagnetic coupling into sensitive analog sections. Leaving it floating increases susceptibility to noise and violates recommended layout practices per the datasheet.

Does AP7343Q-185W5-7 include output discharge functionality?

No - the "Q" suffix and "W5" package code indicate the non-discharge variant. Unlike the AP7343DQ series, this part does not integrate an internal discharge FET. When disabled, VOUT remains charged until external leakage paths dissipate stored energy, which is intentional for applications requiring hold-up time or controlled power-down sequencing.

How does the AP7343Q-185W5-7 behave during input undervoltage or thermal overload?

Under input undervoltage (VIN < 1.7V), output regulation ceases and VOUT follows VIN minus dropout. During thermal overload, the device enters thermal shutdown at +150°C junction temperature and remains off until junction cools by ≥20°C hysteresis. Both conditions are fully recoverable without latch-up or damage when operated within absolute maximum ratings.