Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated AP2125KC-3.0TRG1

Name: AP2125KC-3.0TRG1
Brand: Diodes Incorporated
SKU: AP2125KC-3.0TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP2125KC-3.0TRG1

Manufacturer:: Diodes Incorporated

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

Package:: SC-82

Datasheet:: AP2125KC-3.0TRG1.pdf

Description:: IC REG LINEAR 3V 300MA SC82

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,924

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AP2125KC-3.0TRG1 from Diodes Incorporated is a 300mA, fixed-output 3.0V CMOS low-dropout (LDO) voltage regulator in SC-70-5 package, featuring 50µV_rms output noise, 65mV dropout at 100mA, ±2% output voltage accuracy, and 0.01µA standby current. It delivers stable power to noise-sensitive analog circuitry in compact battery-powered systems such as portable instrumentation and handheld communication devices.

For engineers reviewing the AP2125KC-3.0TRG1 datasheet, AP2125KC-3.0TRG1 pinout, AP2125KC-3.0TRG1 application, or AP2125KC-3.0TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, enable-controlled shutdown, ceramic capacitor support, and thermal shutdown with +160°C trip point.

Technical Context

The AP2125KC-3.0TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.0V output, active-high enable (CE) control, current-limit protection, and over-temperature shutdown (OTSD). Its CMOS architecture enables low quiescent current (60µA typical) and eliminates external compensation requirements.

It operates across -40°C to +85°C ambient, supports input voltages from 3.5V to 6V (V_IN ≥ V_OUT + 0.5V), and maintains regulation under load currents up to 300mA while rejecting ripple up to 65dB at 1kHz - critical for powering RF front-ends and precision ADCs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0V ±2% - ensures stable biasing for 3.0V logic and analog ICs without external feedback.
Max Output Current	300mA minimum - sufficient to power microcontrollers, sensors, and RF transceivers in portable designs.
Dropout Voltage	65mV at 100mA - enables operation from single-cell Li-ion (3.0–4.2V) or two-cell alkaline sources with minimal headroom loss.
RMS Output Noise	50µV_rms (10Hz–100kHz) - preserves signal integrity in audio codecs, PLLs, and high-resolution ADCs.
PSRR	65dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Quiescent Current	60µA typical - extends battery life in always-on monitoring circuits and low-power sleep modes.
Standby Current	0.01µA typical - enables near-zero power consumption during system shutdown via CE pin control.
Thermal Shutdown	+160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design.

Pinout & Package

AP2125KC-3.0TRG1 is housed in a 5-pin SC-70-5 package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained portable applications. The package is fully RoHS-compliant, halogen- and antimony-free, and rated for reflow soldering at 260°C (10 sec).

Pin/Terminal	Circuit Role	Design Meaning
1	VIN	Input supply connection; accepts 3.5V–6V; requires 1µF ceramic input capacitor for stability.
2	GND	Analog ground reference; must be connected directly to low-impedance PCB ground plane.
3	NC	No internal connection; left unconnected per datasheet - not used for thermal pad or biasing.
4	CE	Active-high enable input; logic high (≥1.5V) enables regulation; logic low (≤0.4V) places device in 0.01µA standby mode.
5	VOUT	Regulated 3.0V output; requires 1µF ceramic output capacitor with ESR < 1Ω for transient response and PSRR optimization.

Key Features

Feature	Design Value
Ultra-low noise regulation	50µV_rms output noise enables clean power for RF receivers and precision analog stages.
Enable-controlled shutdown	0.01µA standby current via CE pin reduces system-level power consumption during idle states.
Ceramic capacitor compatible	Stable with 1µF input/output ceramic capacitors - eliminates need for larger, costlier tantalum or electrolytic types.
High PSRR at high frequency	65dB rejection at 1kHz allows co-location with noisy DC/DC converters without additional filtering.
Over-temperature protection	Auto-shutdown at +160°C with +25°C hysteresis prevents thermal runaway in sealed enclosures or high-density layouts.
±2% output accuracy	Ensures reliable operation of 3.0V I/O interfaces and ADC references across temperature and load variation.

Applications

Portable Medical Sensors

Wireless IoT Endpoints

Use Scenario: Powering low-power biosignal amplifiers and 16-bit ADCs in wearable ECG monitors.

IC Role / Device Role / Timing Role: Provides ultra-low-noise 3.0V supply to analog front-end, minimizing quantization error and baseline drift.

Use Value: 50µV_rms noise ensures <1 LSB noise floor for 3.0V full-scale 16-bit conversion (91µV LSB).

Use Scenario: Supplying BLE SoC (e.g., nRF52840) and environmental sensors in coin-cell–powered asset trackers.

IC Role / Device Role / Timing Role: Delivers regulated 3.0V during active transmission and drops to 0.01µA standby when radio is idle.

Use Value: Enables >2-year battery life on CR2032 by combining low I_Q and CE-controlled deep-sleep mode.

Industrial Handheld Scanners

Automotive Cabin Infotainment Peripherals

Use Scenario: Powering laser diode drivers and image sensor interfaces in rugged barcode scanners.

IC Role / Device Role / Timing Role: Supplies stable 3.0V to timing-critical CCD/CMOS sensor interfaces and motor control logic.

Use Value: 65mV dropout allows direct operation from 3.6V Li-ion packs across full discharge range (3.0–4.2V).

Use Scenario: Regulating power for USB-C PD accessory controllers and touch controller ICs in rear-seat entertainment remotes.

IC Role / Device Role / Timing Role: Provides noise-immune 3.0V rail isolated from vehicle battery transients and infotainment system switching noise.

Use Value: 65dB PSRR at 1kHz rejects coupled noise from nearby Class-D audio amplifiers and display drivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-3002E/MB	250mA max output, 175mV dropout at 250mA, 30µV_rms noise, SOT-23-3 package	Lacks enable pin and thermal shutdown; lower current capacity limits use in higher-load peripherals	Select when board space is constrained to 3-pin layout and enable control is handled externally.
Torex XC6206P302MR-G	300mA max output, 120mV dropout at 100mA, 40µV_rms noise, SOT-23-5 package, no CE pin	Fixed-on operation only; no shutdown capability; slightly higher dropout reduces usable input range	Choose where continuous regulation is required and system-level power sequencing is managed elsewhere.

Compared with MCP1700T-3002E/MB and XC6206P302MR-G, AP2125KC-3.0TRG1 uniquely combines SC-70-5 miniaturization, active-high CE control, thermal shutdown, and sub-70mV dropout - making it optimal for space- and noise-sensitive battery-powered systems requiring autonomous fault protection.

Availability

AP2125KC-3.0TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, industrial handheld scanners, and automotive cabin infotainment peripherals requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.

Supply support for AP2125KC-3.0TRG1 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 solutions, with emphasis on power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The AP2125 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered equipment demanding ultra-low noise, low dropout, and minimal quiescent current in miniature packages.

FAQ

What is the minimum input voltage required for AP2125KC-3.0TRG1 to maintain regulation?

The AP2125KC-3.0TRG1 requires VIN ≥ VOUT + 0.5V = 3.5V for guaranteed regulation across temperature and load. At 100mA output, dropout is 65mV, so operation down to 3.065V is possible - but datasheet specifies 3.5V minimum to ensure ±2% accuracy and PSRR performance over -40°C to +85°C.

Can AP2125KC-3.0TRG1 be used with ceramic output capacitors smaller than 1µF?

No - the datasheet specifies 1µF ceramic output capacitance as mandatory for stability, transient response, and PSRR performance. Using smaller values risks oscillation, degraded load regulation, and reduced ripple rejection; ESR must remain below 1Ω, which standard X5R/X7R ceramics meet at 1µF.

Does the NC pin (Pin 3) require any PCB layout treatment?

Pin 3 is internally unconnected and must be left floating - no solder mask opening, thermal pad, or copper pour should contact it. Diodes Incorporated explicitly states it is not a thermal pad or bias node; connecting it may cause unpredictable behavior or violate absolute maximum ratings.

How does the CE pin behave during power-up and brown-out conditions?

The CE pin has no internal pull-up or pull-down; it must be actively driven to ≥1.5V to enable regulation or ≤0.4V to enter standby. During undervoltage, if CE is tied to VIN, the device powers up only after VIN exceeds ~1.5V - but for robust sequencing, an external supervisor or GPIO is recommended to hold CE low until input stabilizes above 3.5V.

AP2125KC-3.0TRG1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-82

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):: 3V

Voltage - Output (Max):: -

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

Current - Output:: 300mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: -

PSRR:: 65dB (100Hz ~ 1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-82

AP2125KC-3.0TRG1 FAQ

1.How can I place an order for AP2125KC-3.0TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2125KC-3.0TRG1 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 AP2125KC-3.0TRG1 reliable?

The price and inventory of AP2125KC-3.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-3.0TRG1 is usually 5 days.

3.What payment methods are accepted for AP2125KC-3.0TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-3.0TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2125KC-3.0TRG1?

AP2125KC-3.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2125KC-3.0TRG1 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 AP2125KC-3.0TRG1?

For technical support, including AP2125KC-3.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-3.0TRG1 requirements.

6.How does Aetrix verify that AP2125KC-3.0TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2125KC-3.0TRG1 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 AP2125KC-3.0TRG1 meets industry standards.

7.What is the process for return or replacement of AP2125KC-3.0TRG1?

All AP2125KC-3.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-3.0TRG1, 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 AP2125KC-3.0TRG1 part is unused and in its original packaging.

Return procedure for AP2125KC-3.0TRG1:

1.Submit a request within 90 days.

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

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…