Diodes Incorporated AP7315-23SR-7

Overview

AP7315-23SR-7 from Diodes Incorporated is a 2.3V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, 35µA quiescent current, and operates from 1.7V to 5.25V input - optimized for RF supply rails in space-constrained portable devices.

For engineers reviewing the AP7315-23SR-7 datasheet, AP7315-23SR-7 pinout, AP7315-23SR-7 application, or AP7315-23SR-7 equivalent, this page delivers verified specifications, SOT23-3 pin mapping, real-world use cases in RF power management, and validated alternative LDOs with documented functional trade-offs.

Technical Context

The AP7315-23SR-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - enabling stable 2.3V regulation with dropout as low as 280mV at 150mA (for V_OUT ≥ 2.0V). Its enable input (EN) provides precise on/off control with logic-compatible thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and internal short-circuit protection limits output current to ~55mA during fault conditions.

Designed for low-noise analog and RF subsystems, it achieves 60µV_rms noise via optimized internal architecture and requires only 0.47µF ceramic input/output capacitors. Thermal performance is enhanced by the SOT23-3 package's exposed copper pad connection to PCB ground plane, supporting continuous 150mA operation within -40°C to +85°C ambient.

Key Specifications

Pinout & Package

AP7315-23SR-7 is packaged in SOT23-3 (SR variant), a 1.3mm × 2.9mm surface-mount package with gull-wing leads and no thermal pad. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT - matching standard SOT23-3 footprint (JEDEC TO-236AB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.

Compared with AP7315-23SR-7, the SA variant offers identical performance with alternate packaging logistics, while the MCP1700 trades 15dB PSRR and 55µV_rms more noise for lower quiescent current - making it viable only in less demanding signal-chain roles.

Availability

AP7315-23SR-7 is available at Aetrix Electronics and suitable for RF power supply, camera module bias, portable media player audio, and wireless adapter core logic requiring stable component supply, consistent lead-free compliance, and guaranteed 150mA delivery across temperature.

Supply support for AP7315-23SR-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 power management, signal integrity, and connectivity applications.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive RF, imaging, and portable consumer electronics where clean, compact, and efficient local regulation is critical.

FAQ

What is the maximum allowable input voltage for AP7315-23SR-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating safe operating area limits and may trigger internal overvoltage protection or cause permanent damage. For battery-powered designs, this range supports single-cell Li-ion (2.7–4.2V) and regulated 3.3V/5V system rails.

Does AP7315-23SR-7 include an enable pin?

No - the SR suffix denotes the SOT23-3 package variant with the enable function internally tied to VIN, resulting in always-on operation. Unlike the SA or W5 variants, it lacks an external EN pin; therefore, on/off control must be implemented upstream via input power switching.

Can AP7315-23SR-7 be used with ceramic output capacitors smaller than 0.47µF?

No - the datasheet specifies 0.47µF as the minimum stable ceramic output capacitance. Using smaller values (e.g., 0.1µF) risks instability, overshoot, or oscillation under load transients. The device's compensation is optimized for ≥0.47µF with low ESR (<100mΩ), and layout must place the capacitor within 2mm of VOUT and GND pins.

How does thermal performance compare between AP7315-23SR-7 and AP7315-23W5-7?

The SOT23-3 (SR) package has higher thermal resistance (θ_JA ≈ 250°C/W on standard JEDEC board) versus SOT25 (W5) at ≈190°C/W due to fewer pins and smaller copper area. At 150mA and 85°C ambient, SR may reach ~115°C junction temperature - requiring careful PCB copper pour under the package and avoidance of nearby heat sources, unlike the more robust W5 variant.