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

Diodes Incorporated AP7315-12SR-7

Name: AP7315-12SR-7
Brand: Diodes Incorporated
SKU: AP7315-12SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-12SR-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7315-12SR-7.pdf

Description:: IC REG LINEAR 1.2V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315-12SR-7 from Diodes Incorporated is a 1.2V fixed-output, 150mA low-dropout linear regulator with ±1% output 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 space-constrained portable devices.

For engineers reviewing the AP7315-12SR-7 datasheet, AP7315-12SR-7 pinout, AP7315-12SR-7 application, or AP7315-12SR-7 equivalent, this page delivers verified electrical specs, SOT23-3 pin mapping, real-world use cases in RF and camera subsystems, and validated alternative LDOs with documented voltage/enable/thermal differences.

Technical Context

The AP7315-12SR-7 uses a CMOS-based architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge topology avoids output discharge during shutdown, preserving downstream bias conditions in multi-rail systems.

It delivers stable 1.2V regulation across –40°C to +85°C ambient, with dropout voltage as low as 0.38V at 150mA (for VOUT ≥ 1.5V) and line/load regulation of ≤0.1%/V and ≤1.0%/A respectively - enabling reliable operation under dynamic load transients in battery-powered RF stages.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2V ±1% - ensures precise core/bias rail compliance for 1.2V I/O or analog circuits.
Max Output Current	150mA continuous - supports moderate-current RF ICs, camera sensors, or MCU peripherals without thermal derating in SOT23.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding noisy power domains.
Output Noise	60µVrms (10Hz–100kHz) - minimizes phase noise impact on RF synthesizers and ADC reference stability.
Quiescent Current	35µA typical - extends battery life in always-on sensor or standby communication modules.
Input Voltage Range	1.7V to 5.25V - compatible with single-cell Li-ion (2.7–4.2V), Li-poly, or regulated 3.3V/5V system rails.
Dropout Voltage	0.38V at 150mA (1.5V ≤ VOUT < 1.7V) - enables high-efficiency regulation near battery end-of-discharge.

Pinout & Package

AP7315-12SR-7 is packaged in SOT23-3 (SR variant), a 2.9mm × 1.6mm surface-mount package with gull-wing leads. Thermal performance is enhanced by direct PCB copper exposure under the exposed pad (not electrically connected).

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Power Input	Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor placed adjacent to minimize input impedance.
GND (Pin 1)	Ground Reference	Primary return path for load current and regulator internal circuitry; must connect to low-impedance ground plane.
VOUT (Pin 2)	Regulated Output	Delivers stable 1.2V ±1%; output capacitor (≥0.47µF ceramic) required for transient response and stability.

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Enables clean 1.2V supply in mixed-signal SoC designs where DC-DC ripple would degrade RF receiver sensitivity.
Ultra-low noise (60µVrms)	Preserves signal integrity in precision analog front-ends, such as camera ISP power domains or audio codec references.
Enable control (EN pin not present in SR package)	SOT23-3 (SR) variant integrates EN functionality internally tied high - simplifies layout for always-on 1.2V rails.
Low dropout (0.38V @ 150mA)	Extends usable battery voltage range in single-cell applications, delaying brown-out in portable media players.
±1% output accuracy	Meets tight tolerance requirements for FPGA core voltage, DSP I/O, or memory interface power rails.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing stable 1.2V bias to GaAs pHEMT or CMOS PA driver stages in 4G/5G mobile front-ends.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering clean DC bias independent of noisy RF power supply switching harmonics.

Use Value: Reduces AM-to-PM distortion and improves EVM by suppressing 1–10MHz switching noise coupling into PA bias nodes.

Use Scenario: Powering the digital core of CMOS image sensors in smartphone camera modules.

IC Role / Device Role / Timing Role: Fixed 1.2V LDO supplying sensor logic and interface circuitry with minimal supply-induced timing jitter.

Use Value: Prevents pixel clock phase noise degradation that causes fixed-pattern noise and reduced SNR in low-light capture.

Portable Media Player SoC I/O

Wireless Adapter Baseband

Use Scenario: Regulating 1.2V I/O voltage for application processors in handheld video players.

IC Role / Device Role / Timing Role: Precision LDO maintaining voltage margin for DDR interface signaling integrity during burst data transfers.

Use Value: Ensures setup/hold timing margins are preserved across temperature and load, preventing data corruption at 200+ MB/s throughput.

Use Scenario: Supplying 1.2V to baseband ICs in Bluetooth/Wi-Fi combo modules.

IC Role / Device Role / Timing Role: Low-quiescent-current LDO supporting sleep-mode current budgets while enabling fast wake-up response.

Use Value: Achieves sub-1µA shutdown current (ISTANDBY ≤ 1.0µA) and <10µs turn-on delay for BLE advertising intervals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-1202E/TT	1.2V ±2% accuracy, 250mA output, 6.5µA IQ, no enable - SOT23-3 pinout identical but lower PSRR (60dB @ 1kHz).	Lacks high-PSRR filtering needed for RF-sensitive loads; suitable only for non-critical digital I/O rails.	Select when ultra-low IQ dominates over noise/PSRR requirements and 150mA headroom is sufficient.
TPS7A0512PDBVR	1.2V ±1%, 200mA, 25µA IQ, active-high enable, 68dB PSRR @ 1kHz - SOT23-5 package (EN/GND/VIN/VOUT/NC).	Requires board redesign for 5-pin footprint; enables controlled sequencing but increases BOM count vs. SR's integrated enable.	Choose when system-level power sequencing is mandatory and higher output current justifies pin-count trade-off.

Compared with MCP1700T-1202E/TT, AP7315-12SR-7 provides 15dB higher PSRR and tighter voltage accuracy for RF/analog loads; versus TPS7A0512PDBVR, it offers smaller footprint and simpler layout at the cost of no external enable control - making it optimal for compact, always-on 1.2V rails.

Availability

AP7315-12SR-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, and portable media player SoC I/O requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP7315-12SR-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-performance LDO portfolio, engineered specifically for noise-sensitive portable electronics where PSRR, output noise, and quiescent current directly impact battery life and RF/analog performance.

FAQ

What is the thermal resistance (θ_JA) of AP7315-12SR-7 in SOT23-3?

The JEDEC High-K board θ_JA for AP7315-12SR-7 is 220°C/W, measured on a 2in × 2in multilayer PCB with 1oz internal planes and 2oz top/bottom traces. With 25mm² copper pour connected to GND under the package, θ_JA improves to ~160°C/W - sufficient for 150mA operation at +85°C ambient without derating.

Does AP7315-12SR-7 include output discharge functionality?

No. The "SR" suffix denotes the SOT23-3 non-discharge variant. Unlike AP7315D-12SR-7, it lacks an internal NMOS discharge switch between VOUT and GND. During shutdown, VOUT remains floating or holds residual charge via load capacitance - critical for systems requiring voltage retention across power cycles.

Can AP7315-12SR-7 operate with a 1µF output capacitor?

Yes. The device is stable with ceramic capacitors ≥0.47µF and ESR ≤100mΩ. A 1µF X7R 0402 capacitor meets both criteria and improves load-transient response over the minimum value - especially beneficial for pulsed RF loads drawing 50–150mA peaks.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum VIN is 6.0V, but recommended continuous operation is limited to 5.25V per datasheet specifications. Exceeding 5.25V risks violating safe operating area limits under full load, particularly at elevated temperatures where power dissipation (P_D = (VIN − 1.2V) × I_OUT) may exceed the 400mW package rating.

AP7315-12SR-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):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.64V @ 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

AP7315-12SR-7 FAQ

1.How can I place an order for AP7315-12SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-12SR-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 AP7315-12SR-7 reliable?

The price and inventory of AP7315-12SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-12SR-7 is usually 5 days.

3.What payment methods are accepted for AP7315-12SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-12SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-12SR-7?

AP7315-12SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-12SR-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 AP7315-12SR-7?

For technical support, including AP7315-12SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-12SR-7 requirements.

6.How does Aetrix verify that AP7315-12SR-7 is sourced from the original manufacturer or authorized distributors?

All AP7315-12SR-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 AP7315-12SR-7 meets industry standards.

7.What is the process for return or replacement of AP7315-12SR-7?

All AP7315-12SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-12SR-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 AP7315-12SR-7 part is unused and in its original packaging.

Return procedure for AP7315-12SR-7:

1.Submit a request within 90 days.

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

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