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

Diodes Incorporated AP2127N-2.8TRG1

Name: AP2127N-2.8TRG1
Brand: Diodes Incorporated
SKU: AP2127N-2.8TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2127N-2.8TRG1

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP2127N-2.8TRG1.pdf

Description:: IC REG LINEAR 2.8V 300MA SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP2127N-2.8TRG1 from Diodes Incorporated is a 300mA, 2.8V fixed-output CMOS low-dropout (LDO) regulator in SOT-23 package, delivering ±2% output voltage accuracy, 170mV dropout at 300mA, and 60μVRMS output noise - optimized for power-sensitive applications including notebook CPU core logic and USB peripheral rails.

For engineers reviewing the AP2127N-2.8TRG1 datasheet, AP2127N-2.8TRG1 pinout, AP2127N-2.8TRG1 application, or AP2127N-2.8TRG1 equivalent, key selection criteria include dropout performance under 300mA load, 68dB PSRR at 1kHz, shutdown current of 0.1μA, compatibility with 1μF ceramic input/output capacitors, and thermal protection at +165°C.

Technical Context

The AP2127N-2.8TRG1 uses a PMOS pass transistor architecture enabling ultra-low dropout (170mV @ 300mA for VOUT = 2.8V) and high PSRR (68dB @ 1kHz). Its internal 0.8V reference and precision trimming ensure ±2% output accuracy across -40°C to +85°C ambient.

It integrates active shutdown control with 0.1μA standby current, auto-discharge MOSFET (RDS(ON) = 60Ω), over-temperature shutdown (+165°C), and short-circuit current limiting (50mA), all while operating from 2.5V to 6V input without requiring external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±2% - ensures stable rail for 2.8V I/O interfaces and low-voltage microcontrollers
Max Output Current	300mA - supports moderate-power digital loads like USB PHYs and sensor hubs
Dropout Voltage	170mV @ 300mA - enables operation from 3.0V supply when VOUT = 2.8V, minimizing power loss
PSRR	68dB @ 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal systems
Output Noise	60μVRMS - critical for noise-sensitive analog circuits powered from same rail
Quiescent Current	60μA typical - extends battery life in always-on subsystems such as real-time clocks
Shutdown Current	0.1μA - enables deep-sleep modes in portable devices with zero-load leakage

Pinout & Package

SOT-23 package (3-pin, surface-mount) with exposed pad not present; compact footprint (2.9 × 1.3 × 1.0 mm) suitable for space-constrained PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Power Input	Accepts 2.5V–6V input; requires local 1μF ceramic decoupling to suppress supply transients
VOUT (Pin 2)	Regulated Output	Delivers stable 2.8V ±2%; supports 1μF ceramic output capacitor for fast transient response
GND (Pin 1)	Ground Reference	Common return path for input/output currents; must be low-impedance connection to minimize noise coupling

Key Features

Feature	Design Value
Low-noise regulation	60μVRMS output noise enables clean power for ADC references and RF front-ends
Ultra-low standby current	0.1μA shutdown current allows multi-week battery hold-up in maintenance-free IoT nodes
Fast soft-start	50μs ramp time prevents inrush current and output overshoot during power-up
Thermal protection	+165°C junction shutdown with +30°C hysteresis avoids latch-up during sustained overload
Ceramic capacitor compatible	Stable with ≥1μF X7R/X5R MLCC on both input and output - eliminates tantalum cost and reliability risk

Applications

Mobile Baseband Power

Notebook I/O Rail

Use Scenario: Powering baseband processor I/O banks in LTE/5G handsets requiring tight voltage tolerance and low noise.

IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying interface logic between application processor and cellular modem.

Use Value: ±2% accuracy maintains signal integrity across temperature; 68dB PSRR rejects noise from RF power amplifiers.

Use Scenario: Supplying 2.8V for USB 3.0 controller, PCIe retimers, and display interface circuitry in ultrabooks.

IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 3.3V or 5V DC/DC converter.

Use Value: 170mV dropout allows efficient conversion from 3.0V input; 50μs soft-start prevents bus enumeration failures.

Industrial Sensor Node

Wearable Health Monitor

Use Scenario: Providing clean 2.8V bias to MEMS accelerometers, humidity sensors, and low-power microcontrollers in factory-floor nodes.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent LDO powering analog front-end and MCU core simultaneously.

Use Value: 60μVRMS noise preserves sensor SNR; 60μA quiescent current extends 10-year battery life in sealed enclosures.

Use Scenario: Regulating battery voltage to 2.8V for optical heart-rate sensor ASICs and Bluetooth LE radios in wrist-worn devices.

IC Role / Device Role / Timing Role: Always-on power domain enabling wake-on-event functionality with sub-μA sleep current.

Use Value: 0.1μA shutdown current minimizes self-discharge; auto-discharge MOSFET clears residual charge before deep sleep entry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2112K-2.8TRG1	Same 2.8V fixed output but rated for 600mA; uses SOT-23-5 package with separate shutdown pin	Supports higher-current loads (e.g., FPGA I/O banks); requires additional PCB area and routing for 5th pin	Select when >300mA output or independent enable control is required
MCP1700T-2802E/TT	2.8V fixed output, 250mA max, 6μA quiescent current, but only 55dB PSRR @ 1kHz and no auto-discharge	Better for ultra-low-IQ battery backup rails; unsuitable for noise-sensitive analog loads due to lower PSRR	Select only for cost-sensitive, low-noise-tolerance applications where 0.1μA shutdown is unnecessary

Compared with AP2127N-2.8TRG1, AP2112K-2.8TRG1 trades smaller footprint for higher current and pinout flexibility, while MCP1700T-2802E/TT sacrifices PSRR and discharge capability for ultra-low IQ - making AP2127N-2.8TRG1 optimal for balanced noise, efficiency, and feature integration in compact portable designs.

Availability

AP2127N-2.8TRG1 is available at Aetrix Electronics and suitable for notebook computers, industrial sensor nodes, wearable health monitors, and mobile baseband power systems requiring stable component supply with full RoHS/Green compliance.

Supply support for AP2127N-2.8TRG1 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 manufacturer specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and connectivity solutions.

The AP2127 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered and noise-sensitive applications demanding low dropout, low noise, and robust protection features in miniature packages.

FAQ

What is the minimum input voltage required for AP2127N-2.8TRG1 to maintain regulation?

The AP2127N-2.8TRG1 requires VIN ≥ VOUT + VDROP. With a typical dropout of 170mV at 300mA, the minimum functional input is 2.97V. However, per datasheet recommended conditions, VIN must be ≥2.5V - meaning it can regulate down to 2.5V input only when load current is reduced to keep VDROP ≤ 0.3V (e.g., <100mA).

Does AP2127N-2.8TRG1 require an external capacitor on the shutdown pin?

No. The shutdown pin (not present on the SOT-23 3-pin variant) is absent in AP2127N-2.8TRG1 - this part is the fixed-output, non-shutdown version in SOT-23 package. Only SOT-23-5 variants (e.g., AP2127K-2.8TRG1) include a dedicated shutdown pin requiring no external pull-up or pull-down for basic operation.

Can AP2127N-2.8TRG1 be used with a 2.2μF output capacitor instead of 1μF?

Yes. The device is stable with ≥1μF ceramic output capacitors (X7R/X5R), and increasing COUT to 2.2μF improves load transient response by reducing output voltage undershoot/overshoot. No ESR requirements or damping components are needed - the LDO's internal compensation remains stable across this range.

Is the AP2127N-2.8TRG1 pin-compatible with other SOT-23 LDOs like MIC5205-2.8YM5?

No. While both use SOT-23 packages, pin assignments differ: AP2127N-2.8TRG1 uses Pin 1=GND, Pin 2=VOUT, Pin 3=VIN; MIC5205-2.8YM5 uses Pin 1=GND, Pin 2=VIN, Pin 3=VOUT. Direct replacement would cause short-circuit failure unless PCB layout is modified to match pinout.

AP2127N-2.8TRG1 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):: 6V

Voltage - Output (Min/Fixed):: 2.8V

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-23-3

AP2127N-2.8TRG1 FAQ

1.How can I place an order for AP2127N-2.8TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2127N-2.8TRG1 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 AP2127N-2.8TRG1 reliable?

The price and inventory of AP2127N-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2127N-2.8TRG1 is usually 5 days.

3.What payment methods are accepted for AP2127N-2.8TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2127N-2.8TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2127N-2.8TRG1?

AP2127N-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2127N-2.8TRG1 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 AP2127N-2.8TRG1?

For technical support, including AP2127N-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2127N-2.8TRG1 requirements.

6.How does Aetrix verify that AP2127N-2.8TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2127N-2.8TRG1 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 AP2127N-2.8TRG1 meets industry standards.

7.What is the process for return or replacement of AP2127N-2.8TRG1?

All AP2127N-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2127N-2.8TRG1, 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 AP2127N-2.8TRG1 part is unused and in its original packaging.

Return procedure for AP2127N-2.8TRG1:

1.Submit a request within 90 days.

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

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