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

Diodes Incorporated AP7315-18SA-7

Name: AP7315-18SA-7
Brand: Diodes Incorporated
SKU: AP7315-18SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-18SA-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-18SA-7.pdf

Description:: IC REG LINEAR 1.8V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,783

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Product details

Overview

AP7315-18SA-7 from Diodes Incorporated is a 1.8V 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 rails in compact portable electronics.

For engineers reviewing the AP7315-18SA-7 datasheet, AP7315-18SA-7 pinout, AP7315-18SA-7 application, or AP7315-18SA-7 equivalent, key selection criteria include dropout voltage at 150mA (max 0.34V for 1.7V ≤ VOUT < 2.0V), thermal performance in SOT23 package, EN logic thresholds (0.5V low / 1.3V high), and stability with 0.47µF ceramic output capacitance.

Technical Context

The AP7315-18SA-7 employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge topology maintains output voltage during shutdown, and the enable input provides precise on/off control without floating-state risk.

Designed for low-noise biasing, it delivers 60µVrms noise over 10Hz–100kHz and achieves 75dB ripple rejection at 1kHz under 30mA load - critical for sensitive RF and analog signal chains where supply-induced jitter or distortion must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8V ±1% - ensures stable core/bias rail for 1.8V I/O domains and RF ICs.
Max Output Current	150mA - supports moderate-power peripherals like camera modules or Bluetooth radios.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails.
Output Noise	60µVrms (10Hz–100kHz) - preserves SNR in audio codecs and RF synthesizers.
Quiescent Current	35µA typical - extends battery life in always-on sensor or standby-mode subsystems.
Dropout Voltage	0.34V max at 150mA - enables operation from single-cell Li-ion (3.0V min) down to ~2.14V input while maintaining regulation.
Input Voltage Range	1.7V to 5.25V - compatible with Li-ion, Li-Po, and regulated 3.3V/5V system rails.

Pinout & Package

AP7315-18SA-7 is housed in a RoHS-compliant SOT23-3 (SA) package - a 2.9mm × 1.3mm × 1.0mm surface-mount outline with gull-wing leads, optimized for high-density PCB layouts in space-constrained handheld devices.

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 2)	Regulated power output	Delivers clean 1.8V to load; requires 0.47µF ceramic capacitor placed adjacent to minimize impedance and ensure stability.
GND (Pin 1)	Power ground reference	Must connect directly to low-impedance PCB ground plane; serves as return path for both input and output currents.
VIN (Pin 3)	Unregulated input supply	Accepts 1.7–5.25V; requires 0.47µF decoupling capacitor near pin to suppress input transients and supply glitches.
EN (Not present)	Enable control input	Not implemented in SA variant - device is permanently enabled; EN functionality is only available in SOT25 and DFN packages.

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Enables co-location with noisy switching regulators without compromising RF/analog performance.
Low 60µVrms output noise	Meets stringent noise requirements of RF front-ends and precision ADC/DAC reference supplies.
±1% output voltage accuracy	Guarantees reliable logic-level compatibility and timing margin for 1.8V digital interfaces.
35µA quiescent current	Reduces no-load power loss by >50% vs. legacy LDOs, critical for battery runtime in IoT edge nodes.
Thermal shutdown & current limit	Protects against sustained overload or short-circuit events with fold-back current limiting (~55mA short-current).

Applications

Smartphone RF Supply

Camera Module Bias

Use Scenario: Powering LTE/5G transceiver RFICs and PA bias circuits in multi-band smartphones.

IC Role / Device Role / Timing Role: Low-noise post-regulator delivering clean 1.8V to RF synthesizer VCOs and mixer bias networks.

Use Value: 60µVrms noise and 75dB PSRR prevent phase noise degradation and adjacent-channel interference in cellular bands.

Use Scenario: Supplying image sensor analog front-end (AFE) and ISP core logic in mobile camera modules.

IC Role / Device Role / Timing Role: Stable 1.8V rail for CIS pixel array readout and 1.8V I/O interface timing compliance.

Use Value: ±1% accuracy ensures consistent ADC reference tracking and color fidelity across temperature (-40°C to +85°C).

Wireless Adapter Core Logic

Portable Media Player Audio Codec

Use Scenario: Providing regulated 1.8V to Wi-Fi/BT SoC I/O banks and internal PLLs in USB dongles and M.2 adapters.

IC Role / Device Role / Timing Role: Primary low-quiescent LDO for 1.8V domain in ultra-compact wireless peripherals.

Use Value: 35µA IQ enables <10µA system standby current when host controller gates VIN, extending adapter shelf life.

Use Scenario: Powering stereo audio DACs, headphone amplifiers, and DSP cores in flash-based MP3 players.

IC Role / Device Role / Timing Role: Noise-sensitive analog supply for audio signal chain, decoupled from digital switching noise.

Use Value: 60µVrms noise floor avoids audible hiss and preserves >95dB SNR in 24-bit audio playback.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-1802E/TO	300mA rated, 2µA IQ, but only 60dB PSRR at 1kHz and 120µVrms noise	Lacks RF-grade noise/PSRR performance; suitable for digital-only 1.8V rails	Select when ultra-low IQ dominates over noise/PSRR requirements
Torex XC6206P182MR-G	150mA, 1.8V, ±2% accuracy, 50dB PSRR, 80µVrms noise, SOT23-3	Higher output drift and lower rejection limit use in RF/analog paths	Choose for cost-sensitive non-RF applications where ±2% tolerance is acceptable

Compared with MCP1700-1802E/TO and XC6206P182MR-G, AP7315-18SA-7 uniquely balances 150mA capability, ±1% accuracy, 75dB PSRR, and 60µVrms noise in the same SOT23-3 footprint - making it the only option qualified for noise-critical RF and high-fidelity analog supply roles.

Availability

AP7315-18SA-7 is available at Aetrix Electronics and suitable for smartphone RF supply, camera module bias, and wireless adapter core logic requiring stable component supply, long-term manufacturability, and AEC-Q200-aligned reliability documentation.

Supply support for AP7315-18SA-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 consumer, computing, communications, industrial, and automotive markets.

The AP7315 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for low-noise, low-IQ power management in battery-powered portable electronics with stringent RF and audio integrity requirements.

FAQ

Is AP7315-18SA-7 pin-compatible with other SOT23-3 LDOs?

No - AP7315-18SA-7 uses a non-standard SOT23-3 pinout: Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN. Most competing SOT23-3 LDOs (e.g., MCP1700, XC6206) assign Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT. PCB layout and schematic symbols must be verified against Diodes' official marking diagram to avoid functional failure.

Does AP7315-18SA-7 include an enable (EN) pin?

No - the SA suffix denotes the SOT23-3 package variant, which omits the EN pin. Enable functionality is only available in SOT25 (5-pin) and X2-DFN1010-4 (4-pin) variants (e.g., AP7315-18W5-7, AP7315-18FS4-7B). The SA version is permanently enabled and requires VIN to be controlled externally for on/off sequencing.

What is the minimum recommended output capacitance for stability?

The AP7315-18SA-7 is stable with a minimum 0.47µF X5R/X7R ceramic capacitor placed directly between VOUT and GND. Larger values (e.g., 2.2µF–10µF) improve transient response for pulsed loads, but ESR must remain below 100mΩ across 10Hz–2MHz to maintain phase margin - verified per the ESR vs. IOUT stability chart in DS38352 Rev. 2-2.

Can AP7315-18SA-7 be used in automotive applications?

AP7315-18SA-7 is not AEC-Q100 qualified. While its operating temperature range (−40°C to +85°C) meets commercial automotive cabin requirements, Diodes explicitly states that automotive-grade versions require PPAP capability, IATF 16949 manufacturing, and AEC-Q100/101/200 qualification - none of which apply to the SA-packaged part. Use only in non-safety-critical infotainment or accessory systems with customer-specific validation.

AP7315-18SA-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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.44V @ 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

AP7315-18SA-7 FAQ

1.How can I place an order for AP7315-18SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-18SA-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 AP7315-18SA-7 reliable?

The price and inventory of AP7315-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-18SA-7 is usually 5 days.

3.What payment methods are accepted for AP7315-18SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-18SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-18SA-7?

AP7315-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-18SA-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 AP7315-18SA-7?

For technical support, including AP7315-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-18SA-7 requirements.

6.How does Aetrix verify that AP7315-18SA-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-18SA-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 AP7315-18SA-7 meets industry standards.

7.What is the process for return or replacement of AP7315-18SA-7?

All AP7315-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-18SA-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 AP7315-18SA-7 part is unused and in its original packaging.

Return procedure for AP7315-18SA-7:

1.Submit a request within 90 days.

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

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