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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7315-32SR-7

Name: AP7315-32SR-7
Brand: Diodes Incorporated
SKU: AP7315-32SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-32SR-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AP7315-32SR-7.pdf

Description:: IC REG LINEAR 3.2V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:1,180

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Product details

Overview

AP7315-32SR-7 from Diodes Incorporated is a 3.2V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, operates from 1.7V to 5.25V input, and is optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7315-32SR-7 datasheet, AP7315-32SR-7 pinout, AP7315-32SR-7 application, or AP7315-32SR-7 equivalent, this page delivers verified specifications, SOT23-3 package terminal mapping, real-world use cases in RF power stages and camera modules, and validated alternative parts with documented functional differences.

Technical Context

The AP7315-32SR-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current-limit circuitry, and active enable logic. Its non-discharge configuration avoids output pull-down during shutdown, preserving downstream bias conditions.

It achieves stable regulation under fast load transients (e.g., 1mA ↔ 150mA steps in <100µs) and maintains 75dB ripple rejection up to 1kHz while drawing only 35µA quiescent current-critical for battery-powered RF subsystems requiring clean, low-noise 3.2V bias.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.2V ±1% - ensures precise biasing of RF power amplifiers and image sensors without external feedback resistors.
Max Output Current	150mA - supports moderate-power RF ICs and camera ISP cores without thermal derating in SOT23-3.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding noisy system rails.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and ADC reference paths.
Quiescent Current	35µA - extends battery life in always-on sensor or standby RF receiver modes.
Input Voltage Range	1.7V to 5.25V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and regulated 3.3V/5V system rails.
Dropout Voltage	210mV at 150mA - enables regulation down to 3.41V input for 3.2V output, critical for low-VIN battery discharge scenarios.

Pinout & Package

AP7315-32SR-7 is housed in a RoHS-compliant SOT23-3 (SR) package with 1.3mm × 1.3mm footprint and 0.95mm height. Thermal performance is enhanced by direct die attachment to the exposed copper pad on the bottom side, recommended to be connected to GND plane for heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Power Input	Accepts 1.7–5.25V; requires ≥0.47µF ceramic decoupling capacitor placed adjacent to pin to suppress high-frequency noise and stabilize transient response.
GND (Pin 1)	Ground Reference	Primary return path for input/output currents; must connect directly to low-impedance PCB ground plane to minimize voltage drop and ensure PSRR integrity.
VOUT (Pin 2)	Regulated Output	Delivers stable 3.2V ±1%; output capacitor (≥0.47µF ceramic) must be placed within 2mm of this pin and GND for optimal transient immunity.

Key Features

Feature	Design Value
High PSRR	75dB @ 1kHz - rejects ripple from noisy switchers powering baseband processors, preventing RF desensitization.
Ultra-Low Noise	60µV_rms (10Hz–100kHz) - preserves signal integrity in analog front-ends of cellular modems and Wi-Fi transceivers.
Enable Control	EN pin omitted in SR variant - device is permanently enabled; simplifies layout where dynamic power gating is unnecessary.
Low Dropout	210mV @ 150mA - sustains regulation through deep battery discharge (e.g., 3.4V input → 3.2V output), extending usable runtime.
Small Footprint	SOT23-3 (1.3×1.3mm) - enables dense placement near RF ICs and camera modules without sacrificing thermal margin.

Applications

RF Power Amplifier Bias

Camera Image Sensor Core Supply

Use Scenario: Providing clean 3.2V bias to GaAs pHEMT power amplifiers in LTE/Wi-Fi front-end modules.

IC Role / Device Role / Timing Role: Low-noise LDO delivering stable voltage independent of baseband processor switching activity.

Use Value: Prevents AM-to-PM distortion and EVM degradation by suppressing 1–100kHz switching artifacts from shared PMIC rails.

Use Scenario: Powering the analog core of 12MP+ CMOS image sensors in smartphones and action cameras.

IC Role / Device Role / Timing Role: Fixed 3.2V regulator supplying pixel array and analog-to-digital conversion circuitry.

Use Value: Reduces temporal noise and fixed-pattern noise by limiting output voltage drift to ±32mV across temperature and load.

Wireless Adapter PHY Layer

Portable Media Player Audio Codec

Use Scenario: Regulating 3.2V for Bluetooth/Wi-Fi PHY ICs in USB dongles and IoT edge nodes.

IC Role / Device Role / Timing Role: Primary voltage source for RF transceiver digital and analog sections.

Use Value: Ensures consistent packet error rate (PER) by maintaining PSRR >70dB across 100Hz–1MHz, rejecting USB host noise.

Use Scenario: Supplying 3.2V to stereo audio codecs in portable media players and smart speakers.

IC Role / Device Role / Timing Role: Low-noise analog rail for DACs, headphone amplifiers, and microphone preamps.

Use Value: Achieves THD+N <−95dB by limiting broadband noise contribution to <60µV_rms, preserving dynamic range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-3202E/TT	3.2V fixed, 250mA max, 6µA IQ, 65dB PSRR @ 1kHz, SOT23-3	Lower IQ suits ultra-low-power sleep modes; lower PSRR limits use in high-RF-noise environments.	Select when battery life dominates over RF noise immunity; verify dropout (370mV @ 250mA) meets VIN headroom.
TPS7A0532PDBVR	3.2V fixed, 200mA max, 25µA IQ, 70dB PSRR @ 1kHz, SOT23-5 (EN pin present)	Includes enable pin for dynamic control; higher PSRR than MCP1700 but lower than AP7315; larger package.	Choose when system-level power sequencing is required; note SOT23-5 pinout differs-requires layout revision.

Compared with MCP1700T-3202E/TT and TPS7A0532PDBVR, the AP7315-32SR-7 delivers superior PSRR (75dB vs. ≤70dB) and lower output noise (60µV_rms vs. ≥80µV_rms) in the same SOT23-3 footprint-making it optimal for RF-sensitive 3.2V rails where noise and ripple rejection are design-critical.

Availability

AP7315-32SR-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera image sensor core supply, wireless adapter PHY layer, and portable media player audio codec applications requiring stable component supply, long-term manufacturability, and AEC-Q200-aligned reliability documentation.

Supply support for AP7315-32SR-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 and imaging subsystems in portable consumer electronics.

FAQ

What is the maximum input voltage rating for AP7315-32SR-7?

The absolute maximum input voltage is 6.0V. Operation beyond 5.25V violates recommended conditions and risks permanent damage. For sustained operation, VIN must remain between 1.7V and 5.25V per datasheet Section 5, with 0.47µF ceramic input capacitance placed directly at the VIN pin to prevent transient overshoot.

Does AP7315-32SR-7 include an enable pin?

No. The "SR" suffix denotes the SOT23-3 package variant without an enable pin-pins are VIN, GND, and VOUT only. This version is permanently enabled. If enable functionality is required, select AP7315-32W5-7 (SOT25, 5-pin) or AP7315-32FS4-7B (X2-DFN1010-4, 4-pin with EN).

What output capacitor value and type are recommended?

A minimum 0.47µF X5R/X7R ceramic capacitor is required, placed within 2mm of VOUT and GND pins. Larger values (e.g., 2.2µF) improve load-transient response. Avoid high-ESR electrolytics; ESR must be ≤100mΩ for stability across −40°C to +85°C per Figure 11 in DS38352 Rev. 2-2.

How does AP7315-32SR-7 behave during short-circuit events?

Under VOUT-to-GND short, the device limits output current to ~55–60mA (typical) via internal fold-back protection, preventing thermal runaway. Output voltage collapses to ~0.2V, and the part remains functional after fault removal-no latch-off or reset required.

AP7315-32SR-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 3.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.29V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 100 µA

PSRR:: 75dB (1kHz)

Control Features:: -

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP7315-32SR-7 FAQ

1.How can I place an order for AP7315-32SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-32SR-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP7315-32SR-7 reliable?

The price and inventory of AP7315-32SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-32SR-7 is usually 5 days.

3.What payment methods are accepted for AP7315-32SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-32SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-32SR-7?

AP7315-32SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-32SR-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP7315-32SR-7?

For technical support, including AP7315-32SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-32SR-7 requirements.

6.How does Aetrix verify that AP7315-32SR-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-32SR-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7315-32SR-7 meets industry standards.

7.What is the process for return or replacement of AP7315-32SR-7?

All AP7315-32SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-32SR-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP7315-32SR-7 part is unused and in its original packaging.

Return procedure for AP7315-32SR-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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