Diodes Incorporated AP7315DQ-25W5-7

Overview

AP7315DQ-25W5-7 from Diodes Incorporated is an automotive-grade 150mA low-dropout linear regulator with fixed 2.5V output, enable control, and integrated output discharge. It delivers ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and ultra-low 35µA quiescent current. Designed for noise-sensitive automotive power rails including ADAS camera supplies and infotainment POLs, it operates across –40°C to +125°C and is AEC-Q100 Grade 1 qualified in SOT25.

For engineers reviewing the AP7315DQ-25W5-7 datasheet, AP7315DQ-25W5-7 pinout, AP7315DQ-25W5-7 application, or AP7315DQ-25W5-7 equivalent, key selection criteria include its 2.5V fixed output with discharge function, 0.28V typical dropout at 150mA, EN logic thresholds (0.5V_IL/1.3V_IH), and automotive qualification supporting PPAP and IATF 16949 traceability.

Technical Context

The AP7315DQ-25W5-7 uses a CMOS-based LDO architecture with internal N-channel pass transistor and precision bandgap reference. Its enable input controls both regulation and active output discharge via a dedicated 30Ω internal pull-down path when disabled.

It achieves high PSRR through optimized error amplifier design and stable operation with ≥0.47µF ceramic output capacitors. The device incorporates fold-back short-circuit protection (55mA typical) and thermal shutdown, with junction-to-ambient thermal resistance of 179°C/W on JEDEC High-K board.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with matte tin-plated leads, moisture sensitivity level 1, and 0.016g mass. Pin 4 is NC; all other pins are electrically functional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315Q-25W5-7, the AP7315DQ-25W5-7 adds essential discharge capability for reset-critical systems, while TLD1120-25ES trades noise performance for wide-input robustness and diagnostics-making it unsuitable as a drop-in replacement for sensitive analog rails.

Availability

AP7315DQ-25W5-7 is available at Aetrix Electronics and suitable for automotive ADAS camera power, infotainment core rails, and telematics always-on applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle continuity.

Supply support for AP7315DQ-25W5-7 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 manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200 standards.

The AP7315Q series targets automotive power management, delivering high-PSRR, low-noise LDOs optimized for ADAS, infotainment, and connectivity subsystems where reliability and electromagnetic compatibility are mission-critical.

FAQ

What is the purpose of the NC pin (Pin 4) on AP7315DQ-25W5-7?

Pin 4 is a no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected on the PCB layout and should not be tied to ground, power, or any other net. This pin exists solely for mechanical symmetry and package compatibility within the SOT25 footprint and has zero electrical function.

Does AP7315DQ-25W5-7 require an external discharge resistor?

No. The "D" suffix indicates built-in output discharge functionality. When the EN pin is driven low, an internal 30Ω NMOS transistor actively pulls VOUT to GND, eliminating the need for external resistors. This feature ensures rapid, controlled discharge of output capacitance during shutdown, preventing unintended re-powering of downstream circuitry.

Can AP7315DQ-25W5-7 operate with input voltage below 2.5V?

Yes, but only down to 2.78V minimum under full 150mA load due to its 0.28V typical dropout voltage. At lighter loads, it can regulate with lower VIN (e.g., 2.55V at 10mA). Operation below the dropout threshold results in unregulated, pass-through behavior - not recommended for stable 2.5V output. Minimum specified VIN is 1.7V, but regulation requires VIN ≥ VOUT + dropout.

How does the 60µV_rms noise specification impact system-level performance?

This noise level directly limits the effective resolution of 12-bit+ ADCs powered by this LDO and prevents spurious tones in RF local oscillators. Measured across 10Hz–100kHz, it ensures <0.001% RMS voltage fluctuation - critical for maintaining dynamic range in camera ISPs and phase noise in GNSS receivers without adding costly external filtering.