Diodes Incorporated AP7315DQ-28W5-7

Overview

AP7315DQ-28W5-7 from Diodes Incorporated is an automotive-grade 150mA low-dropout linear regulator with fixed 2.8V output, enable control, and integrated output discharge function. 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 sensors and infotainment RF supplies.

For engineers reviewing the AP7315DQ-28W5-7 datasheet, AP7315DQ-28W5-7 pinout, AP7315DQ-28W5-7 application, or AP7315DQ-28W5-7 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, SOT25 package thermal performance (θ_JA = 179°C/W), discharge resistance (30Ω), and guaranteed 150mA load capability across –40°C to +125°C ambient.

Technical Context

The AP7315DQ-28W5-7 uses a CMOS-based LDO architecture with internal N-channel pass transistor and precision bandgap reference. Its enable input (EN) provides clean on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and the integrated discharge path actively pulls VOUT to GND during shutdown via a 30Ω internal NMOS switch.

It operates across 1.7V–5.25V input range with dropout voltage as low as 0.21V at 150mA for 2.8V output, and maintains stability with 0.47µF ceramic output capacitors. Short-circuit protection limits fold-back current to 55mA, and thermal shutdown activates above +150°C junction temperature.

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. Thermal resistance θ_JA = 179°C/W on JEDEC High-K board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315Q-28W5-7, the AP7315DQ-28W5-7 adds critical discharge functionality for fast power sequencing in safety-critical imaging systems; versus TLD1128-1EP, it trades input voltage range and fault protection for superior noise, PSRR, and AEC-Q100 Grade 1 compliance essential in signal-chain applications.

Availability

AP7315DQ-28W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, RF communication subsystems, and other applications requiring stable component supply with full AEC-Q100 Grade 1 traceability and PPAP documentation support.

Supply support for AP7315DQ-28W5-7 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 AP7315Q series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically to meet stringent noise, PSRR, and thermal performance requirements of modern ADAS, infotainment, and telematics systems operating in harsh vehicular environments.

FAQ

What is the purpose of the NC pin on AP7315DQ-28W5-7?

Pin 4 is designated NC (No Connection) and has no internal bond wire or circuit connection. It must remain unconnected - neither routed nor soldered - to avoid unintended parasitic coupling or mechanical stress on the die. This pin exists solely for package symmetry and thermal balance in the SOT25 outline.

How does the output discharge function operate during shutdown?

When the EN pin is pulled low (<0.5V), the internal 30Ω NMOS discharge switch activates between VOUT and GND, discharging external output capacitance within tens of microseconds. This prevents floating or slowly decaying VOUT that could cause latch-up or undefined states in downstream logic, especially critical in camera sensor reset sequences.

Can AP7315DQ-28W5-7 be used with input voltages below 2.8V?

Yes - the device operates with input voltages as low as 1.7V, but regulation is only maintained when VIN ≥ VOUT + dropout voltage. At 150mA load, dropout is 0.21V, so minimum functional VIN is 3.01V. Below that, output collapses linearly; however, the part remains undamaged and resumes regulation once VIN rises above the dropout threshold.

Is the 60µVrms output noise measured under load or no-load conditions?

The 60µV_rms noise specification is measured at I_OUT = 30mA, 10Hz–100kHz bandwidth, with 0.47µF ceramic input/output capacitors. Noise increases slightly at higher loads (e.g., 65µV_rms at 150mA) due to pass transistor thermal effects, but remains within published limits across the full 0–150mA range.