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

Diodes Incorporated AP7315-33SR-7

Name: AP7315-33SR-7
Brand: Diodes Incorporated
SKU: AP7315-33SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-33SR-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-33SR-7.pdf

Description:: IC REG LINEAR 3.3V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,985

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Product details

Overview

AP7315-33SR-7 from Diodes Incorporated is a 3.3V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms 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 and portable media player power rails.

For engineers reviewing the AP7315-33SR-7 datasheet, AP7315-33SR-7 pinout, AP7315-33SR-7 application, or AP7315-33SR-7 equivalent, this page delivers verified electrical specs, SOT23-3 package terminal mapping, real-world use cases in battery-powered RF subsystems, and validated alternative LDOs with documented functional trade-offs.

Technical Context

The AP7315-33SR-7 uses a CMOS-based architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its EN pin provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and it lacks internal discharge functionality (non-discharge variant).

Designed for high-PSRR, low-noise operation, it achieves 75dB ripple rejection at 1kHz and maintains stable regulation across –40°C to +85°C ambient, with dropout voltage as low as 210mV at 150mA output for 3.3V V_OUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±1% - ensures stable core voltage for 3.3V I/O interfaces without external feedback.
Max Output Current	150mA - supports moderate-power RF ICs and camera sensor biasing without thermal derating in SOT23.
Input Voltage Range	1.7V to 5.25V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and 3.3V rail stacking.
PSRR @ 1kHz	75dB - suppresses switching noise from adjacent DC/DC converters feeding sensitive analog/RF circuits.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise impact in VCO/PLL power domains.
Quiescent Current	35µA typical - extends battery life in always-on standby modes of portable devices.
Dropout Voltage	210mV @ 150mA - enables regulation down to ~3.51V input, critical for Li-ion end-of-discharge operation.

Pinout & Package

AP7315-33SR-7 is packaged in SOT23-3 (SR variant), a 3-pin surface-mount package with 0.95mm pitch and exposed pad not connected internally. PCB layout requires direct GND connection to the thermal pad for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Power input	Accepts 1.7–5.25V; requires 0.47µF ceramic capacitor placed adjacent to minimize input impedance.
GND (Pin 1)	Ground reference	Primary return path for load current and regulator control circuitry; must connect to low-impedance ground plane.
VOUT (Pin 2)	Regulated output	Delivers stable 3.3V ±1%; output capacitor (0.47µF ceramic) required for transient stability and EMI suppression.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz - rejects noise from noisy switchers powering adjacent digital blocks.
Ultra-low noise	60µV_rms (10Hz–100kHz) - preserves signal integrity in RF front-end and audio codec supplies.
Enable control	Logic-compatible EN threshold (V_IH ≥ 1.3V) - allows direct interfacing with 1.8V/3.3V GPIO without level shifters.
Low quiescent current	35µA typical - reduces no-load power loss in battery-backed systems during sleep states.
±1% output accuracy	Guaranteed over temperature and line/load - eliminates need for post-regulation trimming in production.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing clean, low-noise bias to GaAs pHEMT power amplifiers in 4G/5G mobile front-ends.

IC Role / Device Role / Timing Role: Low-noise LDO delivering stable 3.3V to PA drain, rejecting switching noise from PMIC DC/DC converters.

Use Value: 60µV_rms noise and 75dB PSRR prevent AM-to-PM distortion and maintain EVM compliance under dynamic load.

Use Scenario: Powering CIS image sensor analog core and PLL circuits in smartphone rear cameras.

IC Role / Device Role / Timing Role: Precision 3.3V supply ensuring consistent pixel response and low-jitter clock generation.

Use Value: ±1% output accuracy and <210mV dropout preserve SNR and frame rate stability across battery voltage range.

Portable Media Player Audio Codec

Wireless Adapter Baseband IC

Use Scenario: Supplying DAC/ADC analog sections in Bluetooth headphones and portable speakers.

IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating audio signal chain from digital switching noise.

Use Value: 60µV_rms noise floor directly translates to >100dB THD+N performance in Class-D amplifier stages.

Use Scenario: Regulating 3.3V supply for Wi-Fi/BT SoC baseband processors in compact IoT modules.

IC Role / Device Role / Timing Role: Enable-controlled LDO enabling fast power cycling of radio subsystems.

Use Value: 35µA quiescent current and 1.7V minimum VIN extend runtime in coin-cell or energy-harvesting designs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3302E/TO	3.3V fixed, 250mA, 6µA IQ, but only 60dB PSRR @ 1kHz and 120µV_rms noise.	Lacks EN pin; unsuitable for dynamic power gating in portable systems.	Prefer when ultra-low IQ dominates over noise/PSRR requirements.
Torex XC6206P332MR-G	3.3V fixed, 250mA, 1.0µA IQ, 70dB PSRR @ 1kHz, 40µV_rms noise, but no EN pin and 2.0V min VIN.	Cannot operate from 1.7V sources (e.g., deeply discharged Li-ion); no enable control limits system-level power sequencing.	Select only for ultra-low-power always-on sensors where input voltage stays ≥2.0V.

Compared with MCP1700-3302E/TO and XC6206P332MR-G, AP7315-33SR-7 uniquely balances 75dB PSRR, 60µV_rms noise, 35µA IQ, and EN control in a 3-pin SOT23 - making it optimal for RF and imaging subsystems requiring both precision and dynamic power management.

Availability

AP7315-33SR-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera sensor core supply, portable media player audio codec regulation, and wireless adapter baseband IC power delivery requiring stable component supply across industrial and consumer production volumes.

Supply support for AP7315-33SR-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 power management, signal integrity, and protection solutions for high-volume electronics markets.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive applications in portable communications, imaging, and wireless infrastructure where clean, efficient, and compact voltage regulation is critical.

FAQ

What is the maximum input voltage for AP7315-33SR-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks permanent damage per the Absolute Maximum Ratings table. Operation above 5.25V is not guaranteed and may degrade long-term reliability even if functional initially.

Does AP7315-33SR-7 include an internal discharge transistor?

No. AP7315-33SR-7 is the non-discharge variant (no "D" suffix). When disabled via the EN pin, the output remains floating and does not actively discharge the output capacitor. For active discharge, select AP7315D-33SR-7 instead.

Can AP7315-33SR-7 be used with ceramic output capacitors smaller than 0.47µF?

No. The datasheet specifies 0.47µF as the minimum recommended ceramic output capacitance for stability across all operating conditions. Using smaller values may cause oscillation or degraded transient response, especially under 150mA load steps.

What is the thermal pad connection requirement for AP7315-33SR-7?

The SOT23-3 package has no exposed thermal pad; the SR variant uses standard SOT23-3 pinout with no thermal pad. Thermal dissipation relies on copper area connected to Pin 1 (GND) and wide traces for VIN/VOUT. Do not confuse with X2-DFN1010-4 or SOT25 variants that include thermal pads.

AP7315-33SR-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):: 3.3V

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

AP7315-33SR-7 FAQ

1.How can I place an order for AP7315-33SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-33SR-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 AP7315-33SR-7 reliable?

The price and inventory of AP7315-33SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-33SR-7 is usually 5 days.

3.What payment methods are accepted for AP7315-33SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-33SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-33SR-7?

AP7315-33SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-33SR-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 AP7315-33SR-7?

For technical support, including AP7315-33SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-33SR-7 requirements.

6.How does Aetrix verify that AP7315-33SR-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-33SR-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 AP7315-33SR-7 meets industry standards.

7.What is the process for return or replacement of AP7315-33SR-7?

All AP7315-33SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-33SR-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 AP7315-33SR-7 part is unused and in its original packaging.

Return procedure for AP7315-33SR-7:

1.Submit a request within 90 days.

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

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