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

Diodes Incorporated AP7315-185SA-7

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

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Part No.:: AP7315-185SA-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-185SA-7.pdf

Description:: IC REG LINEAR 1.85V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,765

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Product details

Overview

AP7315-185SA-7 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 compact portable electronics.

For engineers reviewing the AP7315-185SA-7 datasheet, AP7315-185SA-7 pinout, AP7315-185SA-7 application, or AP7315-185SA-7 equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in Diodes' DS38352 Rev. 2-2 specification.

Technical Context

The AP7315-185SA-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and it lacks internal discharge functionality (non-discharge variant).

Designed for stability with minimal external components, it supports 0.47µF ceramic input and output capacitors. Dropout voltage is 0.34V (typ.) at 150mA for 1.85V output, and thermal performance relies on PCB copper area connected to the GND pin - not a dedicated thermal pad, as the SOT23 (SA) package has no exposed pad.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.85V ±1% - ensures stable biasing for 1.8V I/O domains without external feedback network.
Max Output Current	150mA continuous - sufficient for powering baseband processors, RF transceivers, or camera sensor analog blocks.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding noisy power rails.
Output Noise	60µV_rms (10Hz–100kHz) - preserves signal integrity in sensitive RF and audio analog stages.
Quiescent Current	35µA (typ.) - enables multi-day battery life in always-on sensor or standby communication modules.
Input Voltage Range	1.7V to 5.25V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, or 3.3V/5V system rails.
Dropout Voltage	0.34V (typ.) at 150mA - allows regulation down to ~2.19V input while maintaining 1.85V output.

Pinout & Package

SOT23 (SA) package: 3-pin surface-mount, no thermal pad, 1.3mm × 1.75mm footprint, 1.1mm height. Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN - EN function is not implemented in this variant (SOT23 SA pinout omits EN; confirmed by DS38352 pin assignment table and ordering code "SA" mapping to 3-pin configuration).

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 1)	Regulated power output	Delivers clean 1.85V to load; requires 0.47µF ceramic capacitor placed adjacent to minimize impedance.
GND (Pin 2)	Reference and return path	Must connect directly to low-impedance ground plane; serves as thermal conduction path in SOT23.
VIN (Pin 3)	Unregulated input supply	Accepts 1.7–5.25V; requires local 0.47µF decoupling capacitor to suppress supply transients.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz - maintains output stability when powered from noisy switcher outputs or shared system rails.
Ultra-low noise	60µV_rms (10Hz–100kHz) - avoids modulation of RF LO signals or degradation of ADC SNR in mixed-signal ICs.
Tight output accuracy	±1% over temperature and line/load - eliminates need for post-regulation trimming in production calibration.
Low quiescent current	35µA typical - reduces standby power loss in battery-powered devices with frequent sleep/wake cycles.
Wide input range	1.7V to 5.25V - supports direct connection to partially discharged Li-ion cells or legacy 3.3V/5V supplies.

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 front-ends.

IC Role / Device Role / Timing Role: LDO regulator delivering stable 1.85V rail isolated from noisy PA supply switching artifacts.

Use Value: 75dB PSRR prevents AM-to-PM distortion; 60µV_rms noise avoids phase noise degradation in transmit chain.

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

IC Role / Device Role / Timing Role: Low-noise voltage source for sensor analog core, decoupled from digital I/O and interface logic.

Use Value: ±1% output accuracy ensures consistent pixel response; 35µA quiescent current minimizes dark current drift during idle periods.

Portable Media Player Audio Codec

Wireless Adapter Baseband Core

Use Scenario: Supplying reference and bias voltages to stereo audio DAC/ADC subsystems in Bluetooth headphones or portable speakers.

IC Role / Device Role / Timing Role: Precision LDO for audio analog section, rejecting noise from Bluetooth radio and battery management ICs.

Use Value: 60µV_rms noise prevents audible hiss; 150mA output supports dual-channel headphone drivers with dynamic headroom.

Use Scenario: Regulating core voltage for Wi-Fi/BT SoC baseband processors operating in low-power listening modes.

IC Role / Device Role / Timing Role: Efficient, low-I_Q supply enabling rapid wake-from-sleep transitions without brownout.

Use Value: 35µA quiescent current extends battery life in intermittent connectivity applications; 0.34V dropout enables operation down to 2.19V input.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7315-18SA-7	Fixed 1.8V output (vs. 1.85V); identical PSRR, noise, and quiescent current specs.	Used where 1.8V nominal I/O standard suffices; not suitable for systems requiring exact 1.85V reference alignment.	Select only if system tolerances allow 50mV lower output; verify compatibility with downstream 1.8V logic thresholds.
MCP1700-1802E/TO	1.8V output, 250mA rating, 6µA I_Q, but only 60dB PSRR at 1kHz and 120µV_rms noise.	Better for ultra-low-power sleep modes; insufficient for RF or high-fidelity audio due to higher noise and lower PSRR.	Prefer for battery-critical standby functions; avoid where RF integrity or analog precision is required.

Compared with AP7315-185SA-7, the AP7315-18SA-7 offers identical performance at 1.8V but sacrifices the precise 1.85V requirement, while the MCP1700 trades noise/PSRR for ultra-low I_Q - making the AP7315-185SA-7 optimal for noise-sensitive 1.85V rails where moderate quiescent current is acceptable.

Availability

AP7315-185SA-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, tight voltage tolerance, and low-noise regulation.

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

The AP7315 series belongs to Diodes' precision LDO product line, engineered specifically for noise-sensitive portable electronics where PSRR, output accuracy, and small-footprint packaging are critical design constraints.

FAQ

Is the AP7315-185SA-7 pin-compatible with other AP7315 variants in SOT23?

No - the AP7315-185SA-7 uses a 3-pin SOT23 (SA) package with pins VIN–GND–VOUT (no EN pin), whereas AP7315 variants in SOT25 or X2-DFN1010-4 include an EN terminal. The SA suffix explicitly denotes the 3-pin non-enable configuration per Diodes' ordering guide.

Does the AP7315-185SA-7 include output auto-discharge functionality?

No - the "D" suffix (e.g., AP7315D-185SA-7) indicates built-in discharge; the absence of "D" in AP7315-185SA-7 confirms it is the non-discharge version. Output voltage decays only through load current or external bleed resistors.

What is the minimum recommended output capacitance for stability?

Diodes specifies 0.47µF ceramic capacitor as the minimum for stable operation across all loads. Lower values risk oscillation or degraded transient response; X5R/X7R dielectrics with ≤100mΩ ESR are recommended per DS38352 Section 11.

Can the AP7315-185SA-7 operate from a 1.8V input supply?

No - the absolute minimum input voltage is 1.7V, but functional regulation requires VIN ≥ VOUT + dropout. At 150mA, dropout is 0.34V (typ.), so minimum functional VIN is ~2.19V. Below that, output collapses and regulation is lost.

AP7315-185SA-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

AP7315-185SA-7 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AP7315-185SA-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 AP7315-185SA-7?

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

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

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

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

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

Return procedure for AP7315-185SA-7:

1.Submit a request within 90 days.

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

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