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

Diodes Incorporated AP7315-31FS4-7B

Name: AP7315-31FS4-7B
Brand: Diodes Incorporated
SKU: AP7315-31FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-31FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7315-31FS4-7B.pdf

Description:: IC REG LINEAR 3.1V 150MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315-31FS4-7B 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 - designed for RF supply rails in compact portable electronics.

For engineers reviewing the AP7315-31FS4-7B datasheet, AP7315-31FS4-7B pinout, AP7315-31FS4-7B application, or AP7315-31FS4-7B equivalent, this page delivers verified electrical specs, thermal-aware package layout guidance, enable-controlled power sequencing, and validated alternatives for low-noise, high-PSRR LDO selection in space-constrained designs.

Technical Context

The AP7315-31FS4-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active-high enable input - enabling fast load transient response (<100µs) and stable operation with only 0.47µF ceramic input/output capacitors. Its non-discharge architecture avoids output voltage collapse during shutdown.

Designed for 1.7V to 5.25V input range, it delivers regulated 3.1V output with dropout as low as 210mV at 150mA (for V_OUT ≥ 2.8V), supporting battery-powered systems where headroom and efficiency are critical. Thermal performance is enhanced via the exposed thermal pad in its X2-DFN1010-4 package.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.1V ±1% - ensures stable biasing for RF ICs and sensors without external feedback network.
Max Output Current	150mA continuous - sufficient for powering baseband processors, camera modules, or wireless transceivers.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCBs.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise impact on RF front-end performance.
Quiescent Current	35µA typical - extends battery life in always-on sensor or standby communication circuits.
Dropout Voltage	210mV at 150mA - enables operation down to 3.31V input, compatible with single-cell Li-ion or Li-poly systems.
Enable Threshold	V_EN(H) = 1.3V min, V_EN(L) = 0.5V max - compatible with 1.8V/3.3V GPIO control without level-shifting.

Pinout & Package

X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) with exposed thermal pad - requires PCB copper pour connected to GND for optimal thermal dissipation (θ_JA ≈ 220°C/W on JEDEC High-K board).

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 4)	Input power supply	Accepts 1.7–5.25V; must be decoupled with ≥0.47µF ceramic capacitor placed adjacent to pin.
GND (Pin 2)	Ground reference	Low-impedance return path; connects to thermal pad and system ground plane to minimize noise coupling.
EN (Pin 3)	Enable control	Active-high logic input; floating state is undefined - tie to VIN if always-on operation is required.
VOUT (Pin 1)	Regulated output	Delivers 3.1V ±1%; requires 0.47µF ceramic capacitor near pin to ensure stability under load transients.
Thermal Pad	Thermal dissipation node	Not electrically functional; must be soldered to large GND copper area for thermal management - not used as signal GND.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz - maintains clean supply under noisy DC/DC ripple, critical for RF synthesizers.
Ultra-low noise	60µV_rms (10Hz–100kHz) - prevents amplitude modulation of sensitive analog receivers.
Low quiescent current	35µA typical - enables >1-year battery life in IoT endpoint devices with periodic wake-up.
Small footprint	X2-DFN1010-4 (1.0×1.0mm) - saves >60% board area vs. SOT23, enabling ultra-thin mobile designs.
Wide input range	1.7V to 5.25V - supports direct connection to single-cell batteries, USB, or intermediate rail supplies.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing clean, low-noise bias voltage to GaAs pHEMT or SiGe HBT RF power amplifiers in 4G/5G modules.

IC Role / Device Role / Timing Role: LDO regulator delivering stable 3.1V supply independent of PA current surges and switching noise from PMIC.

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

Use Scenario: Powering high-resolution CMOS image sensor cores (e.g., 12MP+) in smartphones and action cameras.

IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO supplying analog pixel array and ADC reference rails.

Use Value: ±1% accuracy and <100µs load step response eliminate image banding and black-level drift during exposure changes.

Wireless Adapter SoC Core

Portable Media Player Audio Codec

Use Scenario: Regulating core voltage for Wi-Fi/BT combo chips (e.g., QCA9377, CYW20735) in dongles and wearables.

IC Role / Device Role / Timing Role: Enable-controlled LDO enabling precise power domain sequencing during sleep/wake transitions.

Use Value: 35µA quiescent current and 210mV dropout extend runtime in battery-operated adapters with intermittent connectivity.

Use Scenario: Supplying DAC/ADC and headphone driver stages in portable audio players with Hi-Res playback capability.

IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating analog audio path from digital SoC noise.

Use Value: 60µV_rms noise floor preserves >110dB SNR in 32-bit audio paths without additional filtering.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3102E/MB	3.1V fixed, 250mA, 6µA I_Q, but only 60dB PSRR @ 1kHz and 120µV_rms noise.	Limited suitability for RF supply due to lower PSRR/noise performance.	Prefer when ultra-low I_Q dominates over noise/PSRR requirements (e.g., long-life sensor nodes).
Torex XC6210B312MR-G	3.1V fixed, 150mA, 70dB PSRR @ 1kHz, 45µV_rms noise, but requires 1µF C_OUT and has no EN pin.	Not suitable for enable-controlled power domains or space-constrained layouts needing minimal capacitance.	Consider only if board area allows larger output cap and enable functionality is unnecessary.

Compared with MCP1700-3102E/MB and XC6210B312MR-G, the AP7315-31FS4-7B uniquely balances 75dB PSRR, 60µV_rms noise, 35µA I_Q, and enable control in a 1.0×1.0mm DFN - making it optimal for RF and imaging subsystems where noise, size, and sequencing coexist as hard constraints.

Availability

AP7315-31FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera sensor core supply, and wireless adapter SoC core regulation requiring stable component supply, consistent parametric performance across temperature, and RoHS-compliant packaging.

Supply support for AP7315-31FS4-7B 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-reliability 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 and battery-powered electronics where supply rail purity directly impacts system-level performance.

FAQ

What is the maximum allowable input voltage for AP7315-31FS4-7B?

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 degrade long-term reliability. Operation above 5.25V is not guaranteed per datasheet specifications and risks permanent damage under sustained stress.

Can the thermal pad of the X2-DFN1010-4 package be left unconnected?

No - the thermal pad must be soldered to a PCB copper pour connected to GND for effective heat dissipation. Leaving it unconnected increases junction-to-ambient thermal resistance by >100°C/W, risking thermal shutdown or accelerated parametric drift above 60°C ambient. The pad is not electrically functional but is thermally critical.

Is AP7315-31FS4-7B pin-compatible with other AP7315 variants in the same package?

Yes - all AP7315 variants in X2-DFN1010-4 (e.g., AP7315-25FS4-7B, AP7315-33FS4-7B) share identical pinout (VIN, GND, EN, VOUT) and footprint. Only the fixed output voltage differs; no layout change is needed when substituting within the same package code, provided the target voltage meets system requirements.

Does AP7315-31FS4-7B include reverse-current protection?

No - the AP7315-31FS4-7B lacks integrated reverse-current blocking. When VIN drops below VOUT (e.g., during input brownout), current can flow backward from VOUT to VIN through the pass device. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems where backfeed must be prevented.

AP7315-31FS4-7B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-XDFN Exposed Pad

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:: -

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7315-31FS4-7B FAQ

1.How can I place an order for AP7315-31FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-31FS4-7B 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 AP7315-31FS4-7B reliable?

The price and inventory of AP7315-31FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-31FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7315-31FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-31FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-31FS4-7B?

AP7315-31FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-31FS4-7B 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 AP7315-31FS4-7B?

For technical support, including AP7315-31FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-31FS4-7B requirements.

6.How does Aetrix verify that AP7315-31FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7315-31FS4-7B 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 AP7315-31FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7315-31FS4-7B?

All AP7315-31FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-31FS4-7B, 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 AP7315-31FS4-7B part is unused and in its original packaging.

Return procedure for AP7315-31FS4-7B:

1.Submit a request within 90 days.

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

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