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

Diodes Incorporated AP7315-185SR7

Name: AP7315-185SR7
Brand: Diodes Incorporated
SKU: AP7315-185SR7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-185SR7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-185SR7.pdf

Description:: IC REG LINEAR 1.85V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:1,472

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Product details

Overview

AP7315-185SR7 from Diodes Incorporated is a 150mA, 1.85V fixed-output 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, operates from 1.7V to 5.25V input, and is optimized for RF supply rails in space-constrained portable electronics.

For engineers reviewing the AP7315-185SR7 datasheet, AP7315-185SR7 pinout, AP7315-185SR7 application, or AP7315-185SR7 equivalent, key selection criteria include dropout voltage at 150mA (max 0.44V for 1.7V ≤ V_OUT < 2.0V), EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), thermal pad handling per X2-DFN1010-4 layout guidance, and compatibility with 0.47µF ceramic C_IN/C_OUT.

Technical Context

The AP7315-185SR7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit protection. Its non-discharge output stage avoids automatic V_OUT discharge when disabled-critical for systems requiring hold-up voltage retention during EN deactivation.

It delivers stable regulation across –40°C to +85°C ambient, supports fast load transient response (e.g., 1mA ↔ 150mA step in <100µs), and maintains 75dB ripple rejection up to 10kHz with 30mA load-enabling clean power delivery to sensitive RF ICs and camera sensor analog blocks.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.85V ±1% at +25°C; ensures precise biasing for 1.8V I/O domains without external feedback.
Max Output Current	150mA guaranteed; sufficient for powering single RF transceivers or image sensor analog front-ends.
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 local oscillator circuits.
Quiescent Current	35µA typical; enables >1-year battery life in always-on sensor nodes with periodic wake-up.
Dropout Voltage	0.44V max at 150mA (for 1.7V ≤ V_OUT < 2.0V); allows operation from single-cell Li-ion (3.0V min) down to 2.3V under load.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.3V; compatible with 1.8V and 3.3V GPIOs without level-shifting.

Pinout & Package

SOT23-3 (SR) package: ultra-compact 2.9mm × 1.3mm footprint with 0.95mm pitch; thermal pad not present-GND connection via Pin 1 only.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (GND)	Ground reference	Primary return path for load current; must connect to low-impedance PCB ground plane to minimize noise coupling.
Pin 2 (VIN)	Input power supply	Accepts 1.7V–5.25V; requires 0.47µF ceramic capacitor placed within 2mm of this pin for stability.
Pin 3 (VOUT)	Regulated output	Delivers 1.85V ±1%; place 0.47µF ceramic capacitor directly between this pin and GND, adjacent to load.

Key Features

Feature	Design Value
Low-noise regulation	60µV_rms output noise enables use in PLL/VCO power rails without added filtering.
High PSRR at audio frequencies	75dB rejection at 1kHz mitigates noise from baseband processors or audio codecs sharing VIN.
Ultra-low quiescent current	35µA IQ allows direct connection to primary battery in always-on IoT edge sensors.
Wide input voltage range	1.7V–5.25V operation supports single-cell Li-ion, Li-polymer, and 3.3V system rails.
Enable-controlled shutdown	EN pin (not present on SR variant) - note: AP7315-185SR7 is SOT23-3, no EN pin; EN function omitted per package.

Applications

RF Transceiver Power

Camera Sensor Bias

Use Scenario: Powering 2.4GHz Wi-Fi/BT SoC RF sections in smartphones and wearables.

IC Role / Device Role / Timing Role: Provides ultra-low-noise 1.85V supply to PA driver stages and LNA bias networks.

Use Value: 60µV_rms noise prevents reciprocal mixing and EVM degradation in 802.11ac/ax transmit paths.

Use Scenario: Supplying analog pixel array and column ADC circuitry in mobile phone camera modules.

IC Role / Device Role / Timing Role: Delivers stable 1.85V rail isolated from digital switching noise on shared PCB layers.

Use Value: 75dB PSRR at 1kHz suppresses noise from high-speed MIPI D-PHY clock feedthrough into image data.

Portable Media Player Core Logic

Wireless Audio Adapter Codec

Use Scenario: Regulating core voltage for low-power ARM Cortex-M microcontrollers in Bluetooth speakers.

IC Role / Device Role / Timing Role: Supplies 1.85V to MCU I/O banks interfacing with flash memory and audio DACs.

Use Value: ±1% output accuracy ensures reliable 1.8V interface timing margins across temperature and line/load variations.

Use Scenario: Powering stereo audio codec ICs in USB-C wireless dongles and earbud charging cases.

IC Role / Device Role / Timing Role: Provides clean 1.85V reference for headphone amplifier bias and DAC reference buffers.

Use Value: 0.44V dropout enables full 1.85V output from partially discharged 2.5V battery cells.

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	100mA max output, 6µV_rms noise (lower), but only 60dB PSRR at 1kHz and no enable pin in TO-92 variant.	Limited to lower-current analog sensors; insufficient for RF PA bias requiring 150mA peak.	Select only if noise is paramount and load current stays below 100mA; verify thermal derating in SOT23-3.
TPS7A05185PDBVR	200mA output, 4µV_rms noise, 80dB PSRR, but 500nA IQ and requires external EN pull-up; larger SOT23-5 footprint.	Better suited for ultra-low-power always-on applications where 500nA standby dominates battery life.	Choose when sub-µA shutdown current is mandatory and board space permits SOT23-5; avoid if strict 3-pin count required.

Compared with MCP1700-1802E/TO and TPS7A05185PDBVR, the AP7315-185SR7 uniquely balances 150mA drive capability, 60µV_rms noise, and SOT23-3 compactness-making it optimal for RF and imaging subsystems where size, noise, and current capacity intersect.

Availability

AP7315-185SR7 is available at Aetrix Electronics and suitable for RF transceiver power, camera sensor bias, and portable media player core logic requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7315-185SR7 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 connectivity solutions for consumer, industrial, and automotive markets.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for noise-sensitive analog and RF subsystems in portable electronics-emphasizing small footprint, low IQ, and robust transient response.

FAQ

What is the maximum allowable input voltage for AP7315-185SR7?

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 Absolute Maximum Ratings. For reliable operation with margin, keep VIN ≤ 5.0V in designs using 5.0V system rails.

Does AP7315-185SR7 include an enable (EN) pin?

No. The AP7315-185SR7 uses the SOT23-3 (SR) package, which has only three pins: GND, VIN, and VOUT. Enable functionality is absent in this variant-regulator is always active when powered. For EN control, select AP7315-185W5 (SOT25) or AP7315-185FS4 (X2-DFN1010-4).

Can AP7315-185SR7 be used with ceramic output capacitors smaller than 0.47µF?

No. The datasheet specifies 0.47µF ceramic as the minimum stable output capacitance. Using smaller values (e.g., 0.22µF) risks instability and oscillation due to insufficient phase margin, especially under dynamic load conditions. Always use ≥0.47µF X5R/X7R ceramic with ≤10mΩ ESR.

How does thermal performance differ between SOT23-3 and X2-DFN1010-4 packages?

The SOT23-3 (SR) lacks a thermal pad and has higher junction-to-ambient thermal resistance (θ_JA ≈ 250°C/W on JEDEC standard board), limiting continuous 150mA operation above 60°C ambient. The X2-DFN1010-4 (FS4) includes a thermal pad connected to PCB copper, achieving θ_JA ≈ 160°C/W-enabling full-rated current up to +85°C with proper layout.

AP7315-185SR7 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:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 1.85V

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

AP7315-185SR7 FAQ

1.How can I place an order for AP7315-185SR7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-185SR7 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 AP7315-185SR7 reliable?

The price and inventory of AP7315-185SR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-185SR7 is usually 5 days.

3.What payment methods are accepted for AP7315-185SR7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-185SR7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-185SR7?

AP7315-185SR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-185SR7 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 AP7315-185SR7?

For technical support, including AP7315-185SR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-185SR7 requirements.

6.How does Aetrix verify that AP7315-185SR7 is sourced from the original manufacturer or authorized distributors?

All AP7315-185SR7 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 AP7315-185SR7 meets industry standards.

7.What is the process for return or replacement of AP7315-185SR7?

All AP7315-185SR7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-185SR7, 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 AP7315-185SR7 part is unused and in its original packaging.

Return procedure for AP7315-185SR7:

1.Submit a request within 90 days.

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

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