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

Diodes Incorporated AP2125N-3.0TRE1

Name: AP2125N-3.0TRE1
Brand: Diodes Incorporated
SKU: AP2125N-3.0TRE1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2125N-3.0TRE1

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP2125N-3.0TRE1.pdf

Description:: IC REG LINEAR 3V 300MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,245

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Product details

Overview

AP2125N-3.0TRE1 from Diodes Incorporated is a 300mA, fixed 3.0V output CMOS low-dropout (LDO) regulator in SOT-23-5 package, featuring 65mV dropout at 100mA, ±2% output voltage accuracy, 50µV_rms output noise, and 65dB PSRR at 100Hz–1kHz. It integrates enable control, thermal shutdown, and current limiting for battery-powered portable electronics requiring stable, ultra-low-noise supply rails.

For engineers reviewing the AP2125N-3.0TRE1 datasheet, AP2125N-3.0TRE1 pinout, AP2125N-3.0TRE1 application, or AP2125N-3.0TRE1 equivalent, key selection criteria include dropout performance under 100mA load, standby current below 0.01µA, compatibility with 1µF ceramic output capacitors, and thermal shutdown activation at +160°C.

Technical Context

The AP2125N-3.0TRE1 uses a CMOS-based error amplifier architecture with internal voltage reference and resistor network to maintain regulated 3.0V output across input voltages from 3.5V to 6.0V. Its active-high CE pin enables precise power sequencing and zero-current shutdown mode.

Thermal protection engages at +160°C junction temperature with +25°C hysteresis, while short-circuit current limit is fixed at 50mA. The device operates over –40°C to +85°C ambient and supports stable regulation with low-ESR ceramic capacitors down to 1µF on both input and output.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0V ±2% - ensures consistent logic-level supply for 3.3V-tolerant microcontrollers and sensors.
Max Output Current	300mA minimum - powers multiple low-power peripherals (e.g., Bluetooth modules, ADCs) from single rail.
Dropout Voltage	65mV at I_OUT = 100mA - enables operation with minimal headroom (e.g., 4.0V input → 3.0V output), extending battery life.
Output Noise	50µV_rms (10Hz–100kHz) - preserves signal integrity in analog front-ends and RF biasing circuits.
PSRR	65dB typical at 100Hz–1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Quiescent Current	60µA typical - minimizes standby drain in always-on subsystems like real-time clocks or wake-on-event logic.
Standby Current	0.01µA typical - reduces leakage during system sleep modes, critical for multi-year battery operation.

Pinout & Package

SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, surface-mount, RoHS-compliant, lead-free plating.

Pin/Terminal	Circuit Role	Design Meaning
1	VIN	Main input supply connection; accepts 3.5V–6.0V; requires 1µF ceramic decoupling capacitor.
2	GND	Analog/digital ground reference; must be low-impedance connection to minimize noise coupling.
3	CE	Active-high enable input; logic high ≥1.5V enables regulation; logic low ≤0.4V disables output and reduces current to 0.01µA.
4	NC	No internal connection; electrically isolated; must remain unconnected or tied to GND per layout best practice.
5	VOUT	Regulated 3.0V output; requires 1µF ceramic capacitor with ESR <1Ω for stability across 1–300mA load range.

Key Features

Feature	Design Value
Ultra-low noise regulation	50µV_rms output noise enables clean power for precision analog ICs without additional filtering.
High PSRR at audio frequencies	65dB rejection of 100Hz–1kHz ripple prevents audible noise in audio codec supplies.
Sub-µA shutdown current	0.01µA standby draw allows >10-year battery life in maintenance-free IoT sensor nodes.
Low-ESR capacitor support	Stable with 1µF ceramic output capacitor - eliminates need for bulk electrolytic, reducing board area and cost.
Thermal shutdown with hysteresis	+160°C trip point with +25°C hysteresis prevents thermal cycling damage during sustained overload.

Applications

CDMA/GSM Handsets

Laptops & Notebooks

Use Scenario: Powering RF transceiver bias rails and baseband processor I/O supplies in dual-mode cellular handsets.

IC Role / Device Role / Timing Role: Low-noise post-regulator delivering clean 3.0V to sensitive RF front-end components.

Use Value: 50µV_rms noise prevents reciprocal mixing and maintains EVM compliance under dynamic load conditions.

Use Scenario: Supplying USB controller, touchpad interface, and embedded controller (EC) logic rails in ultraportable notebooks.

IC Role / Device Role / Timing Role: Standby-aware LDO enabling rapid wake-from-sleep with sub-µA quiescent draw.

Use Value: 0.01µA shutdown current extends battery runtime during suspend-to-RAM states without compromising wake latency.

Hand-held Instruments

PCMCIA Cards

Use Scenario: Providing precision analog supply for 16-bit ADCs and op-amp signal chains in portable multimeters and data loggers.

IC Role / Device Role / Timing Role: Ultra-stable voltage source maintaining ±2% accuracy across –40°C to +85°C operating range.

Use Value: ±100ppm/°C temperature coefficient ensures measurement repeatability without calibration drift.

Use Scenario: Regulating 3.0V VCC for PC Card interface logic and flash memory controllers in legacy expansion cards.

IC Role / Device Role / Timing Role: Compact, enable-controlled power domain manager supporting hot-plug insertion detection.

Use Value: CE pin allows host BIOS to sequence power delivery before card enumeration, preventing bus contention.

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/TT	250mA max output, 175mV dropout at 250mA, no enable pin, SOT-23-3 package.	Lacks CE control and thermal shutdown; limited to simpler, lower-current loads.	Select when board space is constrained and enable functionality is unnecessary.
Torex XC6206P302MR-G	300mA output, 150mV dropout at 100mA, 60µV_rms noise, SOT-23-5, no thermal shutdown.	Higher dropout and missing overtemperature protection reduce robustness in thermally dense layouts.	Prefer only if PSRR >65dB is not required and thermal margin is guaranteed by system design.

Compared with MCP1700T-3002E/TT and XC6206P302MR-G, the AP2125N-3.0TRE1 uniquely combines 65mV dropout, integrated enable, thermal shutdown, and 50µV_rms noise in a single SOT-23-5 footprint-making it optimal for compact, battery-sensitive designs demanding full protection and ultra-clean output.

Availability

AP2125N-3.0TRE1 is available at Aetrix Electronics and suitable for CDMA/GSM handsets, handheld instruments, laptops, and PCMCIA cards requiring stable component supply with guaranteed long-term continuity and traceable green sourcing.

Supply support for AP2125N-3.0TRE1 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 for power management, signal integrity, and connectivity applications.

The AP2125 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained, battery-operated portable electronics.

FAQ

What is the minimum input voltage required for stable 3.0V output at 300mA?

The AP2125N-3.0TRE1 requires VIN ≥ VOUT + VDROP = 3.0V + 300mV (max) = 3.3V under full load. Per datasheet, recommended minimum input is 3.5V to ensure regulation across temperature and process variation. At 100mA, dropout is 65mV, allowing operation from 3.065V input.

Can the AP2125N-3.0TRE1 be used with a 0.47µF output capacitor?

No. The datasheet specifies stability with ≥1µF ceramic output capacitor (X5R/X7R, ESR <1Ω). Using 0.47µF violates the minimum capacitance requirement and risks oscillation or poor transient response, especially under 10–100mA load steps.

Does the NC pin (Pin 4) require any PCB routing or grounding?

Pin 4 is internally unconnected. Diodes Incorporated recommends leaving it floating or connecting it to GND via a short trace-no current flows, but grounding improves mechanical reliability and reduces potential for parasitic coupling in high-density layouts.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches +160°C, the device shuts down output and draws only standby current (~0.01µA). After cooling by ≥25°C (to ≤+135°C), it automatically resumes regulation without external reset-enabling self-recovering fault protection in intermittent overload scenarios.

AP2125N-3.0TRE1 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):: 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:: -

Protection Features:: Over Current, Over Temperature

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP2125N-3.0TRE1 FAQ

1.How can I place an order for AP2125N-3.0TRE1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2125N-3.0TRE1 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 AP2125N-3.0TRE1 reliable?

The price and inventory of AP2125N-3.0TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125N-3.0TRE1 is usually 5 days.

3.What payment methods are accepted for AP2125N-3.0TRE1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-3.0TRE1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2125N-3.0TRE1?

AP2125N-3.0TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2125N-3.0TRE1 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 AP2125N-3.0TRE1?

For technical support, including AP2125N-3.0TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-3.0TRE1 requirements.

6.How does Aetrix verify that AP2125N-3.0TRE1 is sourced from the original manufacturer or authorized distributors?

All AP2125N-3.0TRE1 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 AP2125N-3.0TRE1 meets industry standards.

7.What is the process for return or replacement of AP2125N-3.0TRE1?

All AP2125N-3.0TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-3.0TRE1, 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 AP2125N-3.0TRE1 part is unused and in its original packaging.

Return procedure for AP2125N-3.0TRE1:

1.Submit a request within 90 days.

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

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