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

Diodes Incorporated AP7315-185SR-7

Name: AP7315-185SR-7
Brand: Diodes Incorporated
SKU: AP7315-185SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-185SR-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-185SR-7.pdf

Description:: IC REG LINEAR 1.85V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315-185SR-7 from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.85V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in compact portable devices using the SOT23-3 package.

For engineers reviewing the AP7315-185SR-7 datasheet, AP7315-185SR-7 pinout, AP7315-185SR-7 application, or AP7315-185SR-7 equivalent, key selection criteria include dropout voltage at 150mA (max 0.44V), enable threshold compatibility (V_EN(H) ≥ 1.3V), thermal performance in SOT23-3, and stability with 0.47µF ceramic output capacitance.

Technical Context

The AP7315-185SR-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current-limit circuitry, and active enable control. Its non-discharge configuration means the output remains floating during shutdown, avoiding unintended discharge paths.

It operates across 1.7V–5.25V input range, delivers regulated 1.85V output up to 150mA, and maintains regulation under load transients typical of RF power amplifiers and camera sensor biasing - enabled by low output impedance and high PSRR below 100kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.85V ±1% - ensures stable bias for 1.8V I/O domains and RF front-end ICs without external feedback.
Max Output Current	150mA - sufficient for powering baseband processors, Wi-Fi/BT transceivers, or image sensor analog blocks.
PSRR	75dB at 1kHz - suppresses switching noise from DC/DC converters feeding the LDO input, critical for RF signal integrity.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and LNAs powered from this rail.
Quiescent Current	35µA typical - enables ultra-low-power standby modes in battery-operated handheld equipment.
Dropout Voltage	0.44V max at 150mA - allows operation from single-cell Li-ion (3.0V min) or 3.3V system rails with margin.
Enable Threshold	V_EN(H) ≥ 1.3V, V_EN(L) ≤ 0.5V - compatible with 1.8V GPIOs and supports clean sequencing with host controllers.

Pinout & Package

AP7315-185SR-7 uses the SOT23-3 (SR) package: 2.9mm × 1.6mm footprint, 1.1mm height, surface-mount, lead-free, RoHS-compliant. Thermal pad is absent - thermal dissipation relies on copper area connected to GND via the GND pin.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Input power supply	Accepts 1.7V–5.25V; requires 0.47µF ceramic decoupling capacitor placed adjacent to minimize input impedance.
GND (Pin 1)	Ground reference	Primary return path for input/output current; must connect to low-impedance PCB ground plane to maintain PSRR and stability.
VOUT (Pin 2)	Regulated output	Delivers 1.85V ±1%; requires 0.47µF ceramic output capacitor near load to ensure transient response and loop stability.
EN (Not present)	Enable control	Not implemented in SR variant - device is always enabled; EN functionality is only available in SOT25 and DFN packages.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz - rejects ripple from upstream switching regulators, preserving signal purity in RF and audio subsystems.
Ultra-low noise	60µV_rms (10Hz–100kHz) - prevents noise coupling into sensitive analog circuits like ADC references or PLL charge pumps.
Low quiescent current	35µA typical - extends battery life in always-on sensor nodes and wearable devices without compromising regulation.
Wide input range	1.7V–5.25V - supports direct connection to single-cell Li-ion, USB VBUS, or intermediate 3.3V/2.5V rails.
±1% output accuracy	Guaranteed over -40°C to +85°C - ensures reliable logic-level compatibility and ADC reference stability across industrial temperature range.

Applications

RF Power Amplifier Bias

Camera Sensor Analog Supply

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

IC Role / Device Role / Timing Role: Primary LDO delivering stable 1.85V rail isolated from noisy DC/DC converter outputs.

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

Use Scenario: Powering analog pixel arrays and column readout circuits in smartphone CMOS image sensors.

IC Role / Device Role / Timing Role: Low-noise post-regulator for sensor analog core, decoupled from digital I/O supply.

Use Value: ±1% accuracy and <0.44V dropout ensure consistent pixel response and dynamic range across battery discharge profile.

Wi-Fi/Bluetooth Transceiver Core

Portable Media Player Audio Codec

Use Scenario: Supplying core logic and RF synthesizer blocks in dual-band Wi-Fi 6/Bluetooth 5 SoCs.

IC Role / Device Role / Timing Role: Dedicated 1.85V LDO for transceiver subsystem, enabling independent power gating.

Use Value: 35µA quiescent current and fast load transient response (<100µs) support low-power listen modes and burst transmission.

Use Scenario: Delivering precision analog supply to stereo DACs and headphone amplifiers in portable music players.

IC Role / Device Role / Timing Role: Low-noise voltage source for audio signal chain, minimizing hiss and background noise.

Use Value: 60µV_rms noise floor directly translates to >100dB SNR in 24-bit audio playback, meeting Hi-Res Audio requirements.

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, 6µA IQ, no enable pin, TO-92 package	Limited to lower-current analog sensors; through-hole mounting only	Select when ultra-low IQ dominates over output current and SMT is not required.
TPS7A05185PDBVR	200mA output, 25µA IQ, active-low enable, SOT23-5 package	Includes enable and thermal shutdown; larger footprint than SR variant	Select when higher current headroom, precise enable control, or enhanced protection are needed.

Compared with MCP1700-1802E/TO, AP7315-185SR-7 delivers 50% more output current and SMT compatibility; versus TPS7A05185PDBVR, it trades enable functionality and thermal protection for minimal footprint and cost - ideal for space-constrained RF bias rails where enable is managed upstream.

Availability

AP7315-185SR-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor analog supply, and portable media player audio codec applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for AP7315-185SR-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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO portfolio - engineered specifically for noise-sensitive RF, imaging, and portable communication systems where small size and precision regulation are critical.

FAQ

What is the maximum allowable input voltage for AP7315-185SR-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 excessive power dissipation or reliability risk, especially at high ambient temperatures. The 1.85V output and ~0.44V dropout mean optimal efficiency occurs with VIN between 2.3V and 3.6V.

Does AP7315-185SR-7 include an enable pin?

No. The SR suffix denotes the SOT23-3 package variant, which omits the EN pin. This version is permanently enabled - VIN applied powers VOUT immediately. Enable functionality is only available in SOT25 (5-pin) and X2-DFN1010-4 (4-pin) variants of the AP7315 family.

Can AP7315-185SR-7 be used with ceramic output capacitors smaller than 0.47µF?

No - the datasheet specifies 0.47µF as the minimum stable ceramic output capacitance. Using smaller values risks instability, overshoot, or oscillation under load transients. The internal compensation is optimized for ≥0.47µF with low ESR; deviation voids guaranteed performance across temperature and current ranges.

How does thermal performance compare between AP7315-185SR-7 and the DFN package variant?

The SOT23-3 (SR) package has higher thermal resistance (θ_JA ≈ 250°C/W) than X2-DFN1010-4 (θ_JA ≈ 180°C/W). At 150mA and 3.3V input, SR's junction temperature rise exceeds 60°C above ambient - requiring careful PCB copper area design. DFN offers superior thermal dissipation for continuous high-current operation.

AP7315-185SR-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):: 1.85V

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

AP7315-185SR-7 FAQ

1.How can I place an order for AP7315-185SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-185SR-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 AP7315-185SR-7 reliable?

The price and inventory of AP7315-185SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-185SR-7 is usually 5 days.

3.What payment methods are accepted for AP7315-185SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-185SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-185SR-7?

AP7315-185SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-185SR-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 AP7315-185SR-7?

For technical support, including AP7315-185SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-185SR-7 requirements.

6.How does Aetrix verify that AP7315-185SR-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-185SR-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 AP7315-185SR-7 meets industry standards.

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

All AP7315-185SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-185SR-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 AP7315-185SR-7 part is unused and in its original packaging.

Return procedure for AP7315-185SR-7:

1.Submit a request within 90 days.

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

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