Diodes Incorporated AP7315DQ-27W5-7

Overview

AP7315DQ-27W5-7 from Diodes Incorporated is an automotive-grade 150mA low-dropout linear regulator with fixed 2.7V output, enable control, and integrated output discharge function. It features ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), 35µA quiescent current, and AEC-Q100 Grade 1 qualification for use in ADAS camera power rails and infotainment domain controllers.

For engineers reviewing the AP7315DQ-27W5-7 datasheet, AP7315DQ-27W5-7 pinout, AP7315DQ-27W5-7 application, or AP7315DQ-27W5-7 equivalent, this LDO delivers high PSRR and ultra-low noise in SOT25 for noise-sensitive automotive subsystems requiring fast transient response, precise voltage regulation, and controlled power-down via active discharge.

Technical Context

The AP7315DQ-27W5-7 employs a CMOS-based LDO architecture with internal N-channel pass transistor and precision bandgap reference. Its enable input controls both regulation state and activation of the 30Ω on-resistance auto-discharge path between VOUT and GND during shutdown.

It operates across 1.7V–5.25V input range with guaranteed 150mA output current, dropout voltage as low as 0.29V at 2.8V≤VOUT≤3.3V (scaling to ~0.34V at 2.7V), and thermal shutdown protection. The device maintains stability with 0.47µF ceramic output capacitors and supports junction temperatures from –40°C to +150°C.

Key Specifications

Pinout & Package

SOT25 (5-pin small-outline transistor) package with matte tin-plated leads, moisture sensitivity level 1 per J-STD-020, and 0.016g mass. Pin 4 is NC (no connection); all other pins are electrically functional and thermally critical.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315Q-27W5-7, the AP7315DQ-27W5-7 adds essential discharge functionality for automotive power sequencing compliance, while TLD1121-27ES offers higher current but sacrifices PSRR, noise performance, and automotive qualification-making it unsuitable for ADAS or infotainment core rails.

Availability

AP7315DQ-27W5-7 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC core supplies, and telematics GNSS receivers requiring stable component supply, AEC-Q100 traceability, and long-term lifecycle support.

Supply support for AP7315DQ-27W5-7 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 solutions for automotive, industrial, computing, and consumer markets.

The AP7315Q series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically for noise-sensitive, high-reliability power management in ADAS, infotainment, and body electronics where AEC-Q100 Grade 1 operation and PPAP compliance are mandatory.

FAQ

What is the purpose of the NC pin (Pin 4) on AP7315DQ-27W5-7?

Pin 4 is a no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected on the PCB-neither tied to GND nor left floating as a stub. This design choice reduces package cost and avoids unintended coupling paths that could degrade PSRR or EMI performance in automotive environments.

Can AP7315DQ-27W5-7 operate with input voltage below 2.7V?

Yes-the device supports input voltages as low as 1.7V. However, regulation is only maintained while VIN ≥ VOUT + dropout voltage (≥3.04V for 2.7V output at 150mA). Below that threshold, output follows input minus dropout, entering dropout mode. This enables operation during automotive cold-crank events where battery dips to ~3.0V.

How does the auto-discharge function behave during EN deactivation?

When EN is pulled low, the internal 30Ω NMOS discharge switch activates immediately, sinking current from VOUT to GND. With a 1µF output capacitor, VOUT decays from 2.7V to <0.1V in approximately 1.5ms. Discharge ceases only when EN returns high or VOUT reaches GND potential-ensuring safe, predictable power-down in ASIL-B compliant systems.

Is AP7315DQ-27W5-7 compatible with 1.8V logic-level enable signals?

No-its EN pin requires V_EN(H) ≥1.3V to guarantee turn-on, but 1.8V GPIOs meet this threshold. However, the minimum high-level voltage is 1.3V, not 1.8V; therefore, 1.8V logic is fully compatible. For 1.2V I/O domains, a level shifter or pull-up to VIN is required to ensure reliable activation above 1.3V.