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

Diodes Incorporated AP7315-31W5-7

Name: AP7315-31W5-7
Brand: Diodes Incorporated
SKU: AP7315-31W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-31W5-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP7315-31W5-7.pdf

Description:: IC REG LINEAR 3.1V 150MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315-31W5-7 from Diodes Incorporated is a 3.1V 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, thermal shutdown, and short-circuit protection, and is optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7315-31W5-7 datasheet, AP7315-31W5-7 pinout, AP7315-31W5-7 application, or AP7315-31W5-7 equivalent, this page delivers verified electrical specifications, SOT25 package layout guidance, real-world load transient behavior, and validated alternative LDOs for space-constrained, low-noise power domains.

Technical Context

The AP7315-31W5-7 employs a CMOS-based architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its EN pin provides precise on/off control with 0.5V max logic-low threshold and 1.3V min logic-high threshold, enabling seamless integration into power sequencing schemes.

Designed for high-PSRR, low-noise operation, it maintains stable regulation across 1.7V–5.25V input range while delivering 3.1V ±1% at up to 150mA. Dropout voltage is 210mV typical at 150mA (for V_OUT = 3.1V), supporting efficient operation in battery-powered systems near end-of-life voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.1V ±1% at +25°C; ensures stable biasing for 3.3V-tolerant RF ICs without external feedback network
Max Output Current	150mA guaranteed; supports moderate-power RF front-end stages and camera sensor interfaces
PSRR	75dB at 1kHz; suppresses switching noise from adjacent DC/DC converters feeding shared input rails
Output Noise	60µV_rms (10Hz–100kHz); minimizes phase noise degradation in VCO and PLL supply domains
Quiescent Current	35µA typical; extends battery life in always-on standby circuits such as Bluetooth LE receivers
Dropout Voltage	210mV typical at 150mA; enables operation down to 3.31V input, compatible with single-cell Li-ion (3.0–4.2V) systems
Input Voltage Range	1.7V to 5.25V; accommodates wide-input buck regulators or multi-cell battery configurations

Pinout & Package

The AP7315-31W5-7 is packaged in the SOT25 (5-pin) surface-mount package, featuring a compact 2.9mm × 2.8mm footprint with exposed thermal pad for enhanced power dissipation. Pin 1 is VIN, Pin 2 is GND, Pin 3 is EN, Pin 4 is NC (not connected), and Pin 5 is VOUT - confirmed per Diodes DS38352 Rev. 2-2, page 2.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 1)	Power input	Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor placed adjacent to minimize input impedance
GND (Pin 2)	Ground reference	Primary return path for input/output currents; must connect directly to low-impedance ground plane
EN (Pin 3)	Enable control	Active-high logic input; drives regulator ON when ≥1.3V, OFF when ≤0.5V; floating state prohibited
NC (Pin 4)	No connection	Internally unconnected; recommended to tie to GND for improved thermal conduction and PCB copper fill
VOUT (Pin 5)	Regulated output	Delivers 3.1V ±1% at up to 150mA; requires 0.47µF ceramic output capacitor placed within 2mm of pin

Key Features

Feature	Design Value
High PSRR	75dB @ 1kHz ensures clean 3.1V rail despite noisy DC/DC switching ripple on shared input
Ultra-low noise	60µV_rms (10Hz–100kHz) prevents modulation of sensitive RF receiver chains
Low quiescent current	35µA typical enables >1-year battery life in IoT sensor nodes with periodic wake-up cycles
Thermal shutdown	Integrated protection activates before junction temperature exceeds safe limit under sustained overload
Short-circuit foldback	Limits output current to ~55mA during VOUT-to-GND fault, preventing thermal runaway and board damage

Applications

RF Power Amplifier Bias

Camera Image Sensor Core Supply

Use Scenario: Providing clean, stable 3.1V bias to GaAs pHEMT or SiGe HBT RF power amplifiers in 4G/5G mobile front-ends.

IC Role / Device Role / Timing Role: Low-noise LDO supplying critical analog bias voltage; no timing function.

Use Value: 60µV_rms noise and 75dB PSRR prevent AM-to-PM distortion and EVM degradation in transmit paths.

Use Scenario: Delivering regulated 3.1V core voltage to high-resolution CMOS image sensors in smartphone rear cameras.

IC Role / Device Role / Timing Role: Precision voltage source for pixel array and ADC reference; no timing function.

Use Value: ±1% output accuracy and <210mV dropout ensure consistent sensor gain and dynamic range across battery discharge curve.

Wireless Audio Codec Supply

Bluetooth LE SoC I/O Rail

Use Scenario: Powering audio codec analog sections (DAC, headphone amp) in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Low-noise analog supply rail; no timing function.

Use Value: 35µA quiescent current extends playback time; 75dB PSRR isolates audio path from digital switching noise.

Use Scenario: Supplying 3.1V I/O domain for Bluetooth 5.x SoCs operating in ultra-low-power beacon mode.

IC Role / Device Role / Timing Role: Enable-controlled power rail for peripheral interface; no timing function.

Use Value: EN pin allows synchronous power gating with host MCU, reducing system standby current to sub-µA levels.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-3102E/MB	3.1V fixed, 250mA, 6µV_rms noise, but 120µA IQ and only 60dB PSRR @ 1kHz	Better noise performance, but higher IQ and lower PSRR reduce suitability for RF-biased systems	Prefer for ultra-low-noise audio where PSRR is secondary and higher IQ is acceptable
Torex XC6210B312MR-G	3.1V fixed, 150mA, 40µV_rms noise, 30µA IQ, but no EN pin and 65dB PSRR @ 1kHz	Lacks enable control and has lower PSRR, limiting use in sequenced power architectures	Select when enable functionality is unnecessary and lowest possible noise is prioritized over system-level control

Compared with MCP1703T-3102E/MB and XC6210B312MR-G, the AP7315-31W5-7 uniquely balances ultra-low noise (60µV_rms), high PSRR (75dB), enable control, and micro-power operation (35µA) - making it optimal for RF and imaging subsystems requiring both precision regulation and dynamic power management.

Availability

AP7315-31W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera image sensor core supply, wireless audio codec supply, and Bluetooth LE SoC I/O rail applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for AP7315-31W5-7 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-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive analog and RF subsystems in portable wireless devices where clean, stable, and controllable power is critical.

FAQ

What is the maximum allowable input voltage for AP7315-31W5-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may cause permanent damage or degrade long-term reliability, even if within absolute maximum ratings. Operation above 5.25V voids warranty and is not characterized.

Can the NC pin (Pin 4) be left floating in the SOT25 package?

No - Pin 4 is internally unconnected but should be tied to GND on the PCB. This improves thermal dissipation via increased copper area and reduces electromagnetic coupling; leaving it floating risks parasitic capacitance and potential noise coupling into adjacent traces.

Does AP7315-31W5-7 include output discharge functionality?

No - AP7315-31W5-7 is the non-discharge variant. It lacks an internal pull-down transistor on VOUT; therefore, the output voltage decays only through external load or leakage. For fast VOUT discharge, select AP7315D-31W5-7, which integrates a 30Ω NMOS discharge switch activated during shutdown.

What is the minimum recommended output capacitor value and type?

A minimum 0.47µF X5R/X7R ceramic capacitor is required, placed within 2mm of VOUT and GND pins. Lower ESR (<10mΩ) and higher capacitance (≥1µF) improve transient response for pulsed loads like RF PAs, but stability is guaranteed only with ≥0.47µF ceramics meeting the ESR vs. IOUT stability region in DS38352 Figure 22.

AP7315-31W5-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-74A, SOT-753

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):: 3.1V

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:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP7315-31W5-7 FAQ

1.How can I place an order for AP7315-31W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-31W5-7 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 AP7315-31W5-7 reliable?

The price and inventory of AP7315-31W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-31W5-7 is usually 5 days.

3.What payment methods are accepted for AP7315-31W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-31W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-31W5-7?

AP7315-31W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-31W5-7 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 AP7315-31W5-7?

For technical support, including AP7315-31W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-31W5-7 requirements.

6.How does Aetrix verify that AP7315-31W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-31W5-7 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 AP7315-31W5-7 meets industry standards.

7.What is the process for return or replacement of AP7315-31W5-7?

All AP7315-31W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-31W5-7, 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 AP7315-31W5-7 part is unused and in its original packaging.

Return procedure for AP7315-31W5-7:

1.Submit a request within 90 days.

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

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