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

Diodes Incorporated AP7315D-31W5-7

Name: AP7315D-31W5-7
Brand: Diodes Incorporated
SKU: AP7315D-31W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315D-31W5-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP7315D-31W5-7.pdf

Description:: IC REG LINEAR 3.1V 150MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315D-31W5-7 from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 3.1V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in portable wireless communication devices using SOT25 packaging.

For engineers reviewing the AP7315D-31W5-7 datasheet, AP7315D-31W5-7 pinout, AP7315D-31W5-7 application, or AP7315D-31W5-7 equivalent, this page delivers verified electrical specs, thermal layout guidance, enable control thresholds, dropout behavior across temperature, and real-world ESR-stability boundaries for ceramic output capacitors.

Technical Context

The AP7315D-31W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path activated during shutdown. Its architecture enables fast load transient response (<100µs settling) while maintaining stability with 0.47µF ceramic output capacitance.

It operates across 1.7V–5.25V input range, delivers regulated 3.1V ±1% output up to 150mA, and features an enable pin (EN) with 0–0.5V logic-low shutdown threshold and 1.3–5.25V logic-high activation range - supporting controlled power sequencing in multi-rail systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.1V ±1% at +25°C; ensures stable bias for 3.3V-tolerant RF ICs without external feedback network.
Max Output Current	150mA guaranteed; supports moderate-power RF front-end stages and baseband processors in handheld devices.
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 LNA supply domains.
Quiescent Current	35µA typical; extends battery life in always-on receiver modes of Bluetooth/Wi-Fi modules.
Dropout Voltage	210mV at 150mA (for VOUT = 3.1V); enables operation from single-cell Li-ion (3.0V min) with margin.
Enable Threshold	V_EN(H) ≥ 1.3V, V_EN(L) ≤ 0.5V; compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

SOT25 package (5-pin, 2.9mm × 2.8mm × 1.3mm) with exposed thermal pad; requires PCB copper area connected to GND for thermal dissipation. Pin 4 is NC (not connected internally); recommended tied to GND for improved thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 1)	Input power supply	Accepts 1.7–5.25V; must be decoupled with ≥0.47µF ceramic capacitor placed adjacent to pin.
GND (Pin 2)	Power ground reference	Primary return path; connects to system ground plane to minimize impedance-induced output ripple.
EN (Pin 3)	Enable control input	Logic-controlled on/off; floating state prohibited - tie to VIN if always-on operation required.
NC (Pin 4)	No internal connection	Not bonded; recommended connected to GND to maximize PCB copper area for thermal conduction.
VOUT (Pin 5)	Regulated output	Delivers 3.1V ±1%; requires 0.47µF ceramic capacitor placed within 2mm of pin for stability.

Key Features

Feature	Design Value
Active discharge path	30Ω on-resistance when disabled; discharges VOUT to GND within µs-scale, preventing back-powering of downstream circuits.
Low-noise regulation	60µV_rms broadband noise; meets stringent spectral purity requirements for RF synthesizer and mixer bias rails.
High PSRR at audio frequencies	75dB @ 1kHz; rejects ripple from buck converter switching harmonics below 10kHz critical for analog signal chains.
Ultra-low quiescent current	35µA typical; reduces standby power loss by >50% vs. legacy LDOs, enabling longer sleep-mode duration.
Thermal-enhanced SOT25	Exposed thermal pad with GND connection; achieves 150°C/W junction-to-ambient θ_JA on 2-layer 1oz Cu board.

Applications

RF Power Amplifier Bias

Wi-Fi/BT Baseband Core Supply

Use Scenario: Providing clean, stable 3.1V bias to GaAs pHEMT power amplifiers in 2.4GHz/5GHz WLAN modules.

IC Role / Device Role / Timing Role: Low-noise post-regulator for DC/DC converter output, suppressing switching artifacts before PA input.

Use Value: 60µV_rms noise prevents AM-to-PM conversion in PA, preserving EVM and ACLR performance.

Use Scenario: Supplying core logic voltage to dual-mode Wi-Fi 6 + Bluetooth 5.2 SoCs in compact IoT edge nodes.

IC Role / Device Role / Timing Role: Enable-controlled LDO delivering 3.1V to processor I/O banks during active communication bursts.

Use Value: 35µA quiescent current and fast EN turn-on (<10µs) minimize idle power while meeting 100µs wake-up latency targets.

Camera Sensor Analog Rail

Portable Media Player Audio Codec

Use Scenario: Powering analog front-end and PLL circuits of high-resolution CMOS image sensors in smartphone rear cameras.

IC Role / Device Role / Timing Role: Dedicated low-noise LDO isolating sensor analog supply from noisy digital subsystems.

Use Value: ±1% output accuracy maintains consistent pixel gain calibration; 75dB PSRR blocks digital switching noise coupling into analog signal path.

Use Scenario: Regulating 3.1V for stereo DAC/ADC and headphone driver in portable music players with 12-hour battery life.

IC Role / Device Role / Timing Role: Primary analog supply LDO with discharge function preventing pop/click during playback start/stop transitions.

Use Value: Active discharge (30Ω) clears residual charge from output cap in <1ms, eliminating audible transients in audio output stage.

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/TO	300mA rated, 2µA IQ, no enable pin, no discharge, TO-92 package	Lacks EN control and active discharge; unsuitable for sequenced or low-standby-power systems	Select only for cost-sensitive, always-on, low-current (<50mA) applications where footprint and enable are non-critical
Torex XC6210B312MR-G	200mA rated, 1µA IQ, 45dB PSRR @ 1kHz, SOT25, no discharge	Lower PSRR and no discharge path; higher noise (120µV_rms) limits RF use	Acceptable for digital core supplies where noise and sequencing are secondary; avoid for RF/analog rails

Compared with MCP1700-3102E/TO and XC6210B312MR-G, the AP7315D-31W5-7 uniquely combines RF-grade PSRR/noise performance, enable control, and active discharge in a thermally optimized SOT25 - making it the only viable choice for space-constrained, low-noise, sequenced RF power delivery.

Availability

AP7315D-31W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, Wi-Fi baseband core supply, camera sensor analog rail, and portable media player audio codec applications requiring stable component supply, tight output tolerance, and repeatable thermal performance.

Supply support for AP7315D-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 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 portable multimedia applications demanding ultra-low quiescent current and fast transient response.

FAQ

What is the minimum input voltage required for AP7315D-31W5-7 to maintain regulation at full 150mA load?

The minimum input voltage is determined by dropout: at 150mA and 3.1V output, typical dropout is 210mV, so VIN must be ≥3.31V. Absolute minimum VIN per datasheet is 1.7V, but regulation fails below 3.31V under full load. For reliable 150mA operation, design with VIN ≥3.4V.

Does AP7315D-31W5-7 require an external discharge resistor, or is the discharge path fully integrated?

The "D" suffix denotes integrated active discharge: when EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, discharging the output capacitor without external components. No external resistor is needed - this distinguishes it from non-D variants like AP7315-31W5-7.

Can AP7315D-31W5-7 be used with 1µF ceramic output capacitors, or is 0.47µF the strict maximum?

Yes - the device is stable with 0.47µF to 10µF ceramic capacitors. The 0.47µF value is the *minimum* recommended for stability; larger values (e.g., 1µF) improve transient response and reduce output ripple, especially under dynamic load steps common in RF burst transmission.

How does the NC pin (Pin 4) affect thermal performance, and what is the recommended PCB layout for it?

Pin 4 is unconnected internally but occupies die area adjacent to the thermal pad. Connecting it to GND increases copper area under the package, improving heat conduction from the exposed pad. Layout best practice: flood Pin 4 and the thermal pad with a solid GND pour, using ≥4 thermal vias (0.3mm diameter) to inner GND planes.

AP7315D-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

AP7315D-31W5-7 FAQ

1.How can I place an order for AP7315D-31W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315D-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 AP7315D-31W5-7 reliable?

The price and inventory of AP7315D-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 AP7315D-31W5-7 is usually 5 days.

3.What payment methods are accepted for AP7315D-31W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315D-31W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315D-31W5-7?

AP7315D-31W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315D-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 AP7315D-31W5-7?

For technical support, including AP7315D-31W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315D-31W5-7 requirements.

6.How does Aetrix verify that AP7315D-31W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7315D-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 AP7315D-31W5-7 meets industry standards.

7.What is the process for return or replacement of AP7315D-31W5-7?

All AP7315D-31W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315D-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 AP7315D-31W5-7 part is unused and in its original packaging.

Return procedure for AP7315D-31W5-7:

1.Submit a request within 90 days.

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

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