Diodes Incorporated AP7315DQ-11W5-7

Overview

AP7315DQ-11W5-7 from Diodes Incorporated is an automotive-grade 150mA low-dropout linear regulator with fixed 1.1V output, ±1% voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and integrated output discharge function. It operates from 1.7V to 5.25V input, supports –40°C to +125°C ambient, and is qualified to AEC-Q100 Grade 1 in SOT25 for noise-sensitive automotive power rails.

For engineers reviewing the AP7315DQ-11W5-7 datasheet, AP7315DQ-11W5-7 pinout, AP7315DQ-11W5-7 application, or AP7315DQ-11W5-7 equivalent, this LDO delivers precise, low-noise biasing for ADAS camera sensors, infotainment SoC core supplies, and RF transceiver VCO/PLL rails where fast load transient response and shutdown discharge are critical.

Technical Context

The AP7315DQ-11W5-7 uses a CMOS-based architecture with internal N-channel pass transistor and precision bandgap reference, enabling ultra-low quiescent current (35µA typ) and high PSRR across 100Hz–1MHz. Its enable-controlled operation includes defined EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V) and auto-discharge path (30Ω typical R_DS(ON)) activated during shutdown.

Thermal performance is characterized by θ_JA = 179°C/W on JEDEC High-K board, supporting continuous 150mA output up to +125°C ambient when VIN–VOUT ≥ 0.5V. Short-circuit protection limits fold-back current to 55mA, and dropout voltage is specified at 0.50V (max) for 1.1V output at full load.

Key Specifications

Pinout & Package

SOT25 (5-pin, 2.8mm × 2.9mm × 1.3mm) package with matte tin-plated leads, moisture sensitivity level 1 per J-STD-020, and RoHS/lead-free/halogen-free compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315Q-11W5-7, the DQ variant adds critical discharge functionality without sacrificing noise or PSRR; versus TLD1115DQ-11W5-7, it omits reverse-protection circuitry-reducing complexity and cost where that feature is unnecessary.

Availability

AP7315DQ-11W5-7 is available at Aetrix Electronics and suitable for automotive ADAS camera power, infotainment SoC core regulation, and RF transceiver biasing requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for AP7315DQ-11W5-7 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, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The AP7315 series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically for noise-sensitive, safety-critical power rails in ADAS, infotainment, and body electronics where AEC-Q100 Grade 1 operation and PPAP readiness are mandatory.

FAQ

What is the purpose of the NC pin (Pin 4) on AP7315DQ-11W5-7?

Pin 4 is a no-connect terminal with no internal connection. It must remain unconnected on the PCB-no trace, pad, or via should be routed to it. This design choice isolates the EN and VOUT pins electrically and thermally, reducing crosstalk risk in high-density layouts. Diodes specifies no solder mask opening or thermal relief on this pad to maintain isolation integrity.

Does AP7315DQ-11W5-7 require an external discharge resistor?

No. The "D" suffix denotes integrated discharge functionality: when EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, actively discharging output capacitance. This eliminates the need for external resistors, saves board space, and ensures predictable discharge timing (~100µs for 1µF load), critical for preventing back-powering in multi-rail automotive systems.

Can AP7315DQ-11W5-7 operate with input voltage below 1.7V?

No. The absolute minimum input voltage is 1.7V per datasheet specifications. Below this threshold, regulation fails-the output drops below 1.1V and line regulation degrades rapidly. For sub-1.7V operation, consider Diodes' AP7361 series (1.0V min VIN) or alternative architectures like charge pumps, as AP7315DQ-11W5-7's CMOS pass device cannot sustain conduction at lower gate overdrive.

How does the 75dB PSRR at 1kHz translate to real-world noise suppression?

A 75dB PSRR means input ripple at 1kHz is attenuated by a factor of ~5,600×. For example, 10mV_p-p ripple on the 3.3V input rail results in just 1.8µV_p-p residual at VOUT-well below the 100µV_p-p threshold that typically disturbs RF synthesizers or high-speed ADCs. This performance holds across load currents up to 150mA, verified in production test conditions.