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

Diodes Incorporated AP2127R-3.3TRG1

Name: AP2127R-3.3TRG1
Brand: Diodes Incorporated
SKU: AP2127R-3.3TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2127R-3.3TRG1

Manufacturer:: Diodes Incorporated

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

Package:: TO-243AA

Datasheet:: AP2127R-3.3TRG1.pdf

Description:: IC REG LINEAR 3.3V 300MA SOT89

Quantity:: RFQ Add To RFQ list

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Inventory:2,720

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Product details

Overview

AP2127R-3.3TRG1 from Diodes Incorporated is a 300mA, 3.3V fixed-output CMOS low-dropout (LDO) regulator in SOT-89 package, featuring 170mV dropout at full load, ±2% output voltage accuracy, and 60μVRMS output noise. It delivers stable power to noise-sensitive analog circuitry in portable electronics with input range 2.5V–6V and thermal shutdown protection.

For engineers reviewing the AP2127R-3.3TRG1 datasheet, AP2127R-3.3TRG1 pinout, AP2127R-3.3TRG1 application, or AP2127R-3.3TRG1 equivalent, key selection criteria include dropout voltage at 300mA, PSRR performance at 1kHz/10kHz, soft-start time, standby current, and compatibility with 1μF ceramic input/output capacitors.

Technical Context

This LDO employs a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR. Its internal 0.8V reference feeds a precision error amplifier that regulates output via feedback from VOUT to GND, with no external resistor divider required for fixed versions.

The device integrates active shutdown control with 0.1μA standby current, auto-discharge MOSFET (60Ω R_DS(ON)), over-temperature protection at +165°C, and short-circuit current limiting at 50mA - all operating within –40°C to +85°C ambient range.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±2% - ensures stable rail for 3.3V logic and analog ICs without trimming.
Max Output Current	300mA - supports moderate-power microcontrollers, sensors, and RF front-ends.
Dropout Voltage	170mV @ 300mA - enables operation down to VIN = 3.47V, extending battery life in single-cell Li-ion or dual-cell alkaline systems.
PSRR	68dB @ 1kHz, 54dB @ 10kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input.
Output Noise	60μV_RMS - meets low-noise requirements for ADC references, audio codecs, and PLL power supplies.
Quiescent Current	60μA typical - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up circuits.
Soft-Start Time	50μs - prevents inrush current and output overshoot during power-up, easing system-level sequencing.

Pinout & Package

SOT-89 package with exposed thermal pad (connected to GND) for enhanced heat dissipation; θ_JA = 100°C/W enables higher continuous current vs. SOT-23 variants.

Pin/Terminal	Circuit Role	Design Meaning
1 (Tab)	Thermal Pad / GND	Internally connected to GND; must be soldered to PCB copper pour for thermal management and EMI reduction.
2	VIN	Main power input; accepts 2.5V–6V; requires 1μF ceramic capacitor placed adjacent to pin.
3	VOUT	Regulated 3.3V output; connects to load and 1μF ceramic output capacitor; supports auto-discharge via internal 60Ω MOSFET when shutdown asserted.
4	GND	Analog/digital ground reference; ties to thermal pad and system ground plane with low-inductance path.

Key Features

Feature	Design Value
Low-noise regulation	60μV_RMS output noise enables clean power for precision analog signal chains without additional filtering.
Ultra-low standby current	0.1μA shutdown current allows multi-year battery operation in maintenance-free IoT sensor nodes.
Ceramic capacitor compatible	Stable with ≥1μF X5R/X7R MLCC on both input and output - eliminates need for costly tantalum or electrolytic capacitors.
Integrated auto-discharge	60Ω R_DS(ON) discharge path rapidly depletes VOUT capacitance after shutdown, preventing unintended wake-up or latch-up in downstream logic.
Robust protection suite	Combines thermal shutdown (+165°C), short-circuit current limit (50mA), and over-current clamping - reduces need for external protection components.

Applications

Portable Medical Sensors

Notebook Computer I/O Rails

Use Scenario: Powering low-power ECG front-end amplifiers and 16-bit SAR ADCs in wearable patch monitors.

IC Role / Device Role / Timing Role: Primary 3.3V analog supply rail with ultra-low noise and tight regulation to preserve signal integrity and SNR.

Use Value: 60μV_RMS noise and ±2% accuracy maintain ADC ENOB >14 bits across temperature and load variation.

Use Scenario: Supplying USB 3.0 PHY, PCIe clock buffers, and SMBus controllers in ultrabook mainboards.

IC Role / Device Role / Timing Role: Clean post-regulation rail decoupling noisy DC-DC converter outputs while meeting fast transient response requirements.

Use Value: 50μs soft-start and 68dB PSRR at 1kHz prevent data corruption during hot-plug events and reduce system-level EMI filtering cost.

Industrial PLC Digital I/O Modules

Smart Home Hub RF Subsystems

Use Scenario: Providing isolated 3.3V logic supply for optocoupler drivers and SPI interface ICs in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Local point-of-load regulator delivering fault-tolerant power with thermal and short-circuit protection.

Use Value: +165°C thermal shutdown and 50mA short-limit enable reliable operation in unventilated enclosures up to +70°C ambient.

Use Scenario: Powering BLE/Wi-Fi SoCs and RF transceivers in battery-powered smart speakers and security cameras.

IC Role / Device Role / Timing Role: Main system LDO supplying core voltage to wireless SoC during active transmit/receive bursts.

Use Value: 170mV dropout extends usable battery voltage range by ~200mV, increasing runtime per charge in coin-cell or LiPo applications.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2204K-3.3TRG1	Higher 500mA output, 200mV dropout @ 500mA, same SOT-23-5 package; lacks auto-discharge MOSFET.	Better suited for higher-current loads but requires external discharge circuit if rapid VOUT decay is needed.	Select when >300mA load current is required and board space permits SOT-23-5 footprint.
MCP1700T-3302E/TT	250mA max, 175mV dropout @ 250mA, 1.6μA quiescent current; SOT-23-3 package; no shutdown pin.	Ultra-low IQ ideal for energy-harvesting systems, but no enable/shutdown control or thermal protection.	Choose only for always-on, sub-100μA average current applications where shutdown functionality is unnecessary.

Compared with AP2127R-3.3TRG1, AP2204K-3.3TRG1 trades auto-discharge and lower dropout for higher current capability, while MCP1700T-3302E/TT sacrifices protection features and controllability to achieve nanowatt-level standby - making AP2127R-3.3TRG1 optimal for balanced performance in battery-powered industrial and computing applications.

Availability

AP2127R-3.3TRG1 is available at Aetrix Electronics and suitable for notebook computers, portable medical sensors, industrial PLC I/O modules, and smart home RF subsystems requiring stable component supply with guaranteed long-term sourcing.

Supply support for AP2127R-3.3TRG1 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 devices for power management, signal integrity, and connectivity applications.

The AP2127 Series targets battery-powered and noise-sensitive systems, delivering high-accuracy, low-noise, low-quiescent LDO regulation with integrated protection - optimized for space-constrained portable and industrial electronics.

FAQ

What is the minimum input voltage required for AP2127R-3.3TRG1 to maintain regulation at 300mA?

The minimum input voltage is 3.47V, calculated as VOUT + VDROP = 3.3V + 0.17V. Below this, the device enters dropout mode and output voltage drops linearly with input. The absolute minimum specified VIN is 2.5V, but regulation is not guaranteed below 3.47V under full load.

Can AP2127R-3.3TRG1 operate with a 1μF ceramic output capacitor across the full –40°C to +85°C range?

Yes - the datasheet explicitly states stability with ≥1μF X5R or X7R MLCC output capacitors across the full operating temperature range. No ESR requirements or additional compensation components are needed, simplifying design and reducing BOM count.

Does AP2127R-3.3TRG1 require an external pull-up or pull-down on the Shutdown pin?

No - the Shutdown pin has an internal 3MΩ pull-down resistor. When left floating, it defaults to logic low (shutdown state). To enable the regulator, apply ≥1.5V to the Shutdown pin; to disable, drive it ≤0.5V or leave unconnected.

How does the auto-discharge function behave during shutdown, and what is its impact on system power sequencing?

When the Shutdown pin is asserted low, the internal 60Ω MOSFET connects VOUT to GND, discharging output capacitance with τ ≈ 60Ω × C_OUT. With 1μF C_OUT, VOUT falls to <10% in ~140μs - enabling precise power-down timing and preventing back-powering of upstream circuitry during controlled system reset sequences.

AP2127R-3.3TRG1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: -

PSRR:: 68dB ~ 54dB (100Hz ~ 10kHz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

AP2127R-3.3TRG1 FAQ

1.How can I place an order for AP2127R-3.3TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2127R-3.3TRG1 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 AP2127R-3.3TRG1 reliable?

The price and inventory of AP2127R-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2127R-3.3TRG1 is usually 5 days.

3.What payment methods are accepted for AP2127R-3.3TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2127R-3.3TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2127R-3.3TRG1?

AP2127R-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2127R-3.3TRG1 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 AP2127R-3.3TRG1?

For technical support, including AP2127R-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2127R-3.3TRG1 requirements.

6.How does Aetrix verify that AP2127R-3.3TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2127R-3.3TRG1 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 AP2127R-3.3TRG1 meets industry standards.

7.What is the process for return or replacement of AP2127R-3.3TRG1?

All AP2127R-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2127R-3.3TRG1, 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 AP2127R-3.3TRG1 part is unused and in its original packaging.

Return procedure for AP2127R-3.3TRG1:

1.Submit a request within 90 days.

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

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