Diodes Incorporated AP7315-28SR-7

Overview

AP7315-28SR-7 from Diodes Incorporated is a 2.8V 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 AP7315-28SR-7 datasheet, AP7315-28SR-7 pinout, AP7315-28SR-7 application, or AP7315-28SR-7 equivalent, key selection criteria include dropout voltage at 150mA (max 290mV), EN logic thresholds (0.5V low / 1.3V high), thermal performance in SOT23-3, and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7315-28SR-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - enabling stable regulation with fast load transient response and no external compensation required. Its non-discharge architecture maintains VOUT floating during shutdown.

Designed for low-noise biasing, it delivers 2.8V output with ±30ppm/°C temperature coefficient and supports operation across –40°C to +85°C ambient. The enable input accepts standard CMOS logic levels and draws <1.0µA leakage, ensuring minimal system standby power impact.

Key Specifications

Pinout & Package

AP7315-28SR-7 uses the SOT23-3 (SR) package: 1.45mm × 1.3mm footprint, 0.95mm height, with gull-wing leads. Thermal pad is absent; PCB copper pour under device is not required but recommended for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP7315-28SR-7 uniquely balances 75dB PSRR, ±1% accuracy, and 35µA I_Q in SOT23-3 - making it optimal for RF-biased portable systems requiring both noise immunity and battery longevity.

Availability

AP7315-28SR-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera image sensor analog supply, wireless audio codec reference, and Bluetooth LE transceiver VDDIO applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP7315-28SR-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 analog and RF subsystems in portable communications equipment where compact size and battery efficiency are critical.

FAQ

What is the maximum allowable input voltage for AP7315-28SR-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may trigger internal protection or accelerate parametric drift. For battery-powered designs, this range supports single-cell Li-ion (2.8–4.2V) and regulated 3.3V/5V rails without derating.

Does AP7315-28SR-7 include an enable pin, and how is it implemented in the SOT23-3 (SR) package?

No - the SR suffix denotes the SOT23-3 package variant, which has only three pins: VIN, GND, and VOUT. The enable function is omitted in this configuration; the regulator is always active when powered. For enable control, select the SOT25 (W5) or X2-DFN1010-4 (FS4) variants, which expose the EN pin as Pin 3.

Can AP7315-28SR-7 be used with ceramic output capacitors smaller than 0.47µF?

No - the datasheet specifies 0.47µF as the minimum ceramic output capacitance for guaranteed stability and transient response. Using smaller values risks oscillation or excessive overshoot during load steps. The device is optimized for 0.47µF X5R/X7R ceramics with ≤10mΩ ESR; larger values improve PSRR but add cost and board area.

How does the dropout voltage of AP7315-28SR-7 vary with temperature and load current?

At 150mA and 25°C, dropout is typically 210mV (max 290mV); it increases to ~250mV at –40°C and ~270mV at +85°C. This variation is due to R_DS(ON) change in the CMOS pass transistor. Designers must ensure VIN remains ≥3.09V across full temperature and aging to maintain regulation.