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

Diodes Incorporated AP2125N-2.5TRG1

Name: AP2125N-2.5TRG1
Brand: Diodes Incorporated
SKU: AP2125N-2.5TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2125N-2.5TRG1

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP2125N-2.5TRG1.pdf

Description:: IC REG LINEAR 2.5V 300MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,995

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Product details

Overview

AP2125N-2.5TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.5V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µV_rms output noise, ±2% output voltage accuracy, and 65mV dropout at 100mA - designed for power-sensitive analog and RF circuitry in portable battery-powered systems.

For engineers reviewing the AP2125N-2.5TRG1 datasheet, AP2125N-2.5TRG1 pinout, AP2125N-2.5TRG1 application, or AP2125N-2.5TRG1 equivalent, key selection criteria include ultra-low noise performance, enable-controlled shutdown with 0.01µA standby current, compatibility with low-ESR ceramic capacitors, and thermal shutdown protection at +160°C.

Technical Context

The AP2125N-2.5TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.5V output, active-high enable (CE) logic interface, current-limit protection, and over-temperature shutdown (OTSD). Its CMOS architecture enables stable regulation under light-load conditions without requiring minimum load current.

It operates across an input voltage range of 3.0V to 6.0V (V_OUT + 0.5V min), supports output currents up to 300mA, and maintains high PSRR (65dB at 100Hz/1kHz) to suppress switching noise from upstream DC-DC converters in mixed-signal designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% - ensures stable biasing for ADC references and RF front-end ICs.
Max Output Current	300mA minimum - sufficient to power multiple low-power microcontrollers or sensor subsystems.
Dropout Voltage	65mV at 100mA - enables operation from single-cell Li-ion (3.0V–4.2V) or two-cell alkaline sources with minimal headroom loss.
RMS Output Noise	50µV_rms (10Hz–100kHz) - critical for preserving SNR in audio codecs and precision analog signal chains.
Quiescent Current	60µA typical - extends battery life in always-on monitoring applications like wearables and IoT sensors.
Standby Current	0.01µA typical - allows deep-sleep mode activation via CE pin without measurable battery drain.
PSRR	65dB at 100Hz/1kHz - attenuates ripple from switching regulators feeding the LDO input.
Thermal Shutdown	+160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design.

Pinout & Package

AP2125N-2.5TRG1 is packaged in SC-70-5 (2.0mm × 1.25mm × 0.9mm), a space-constrained surface-mount package suitable for high-density portable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	VIN	Input supply connection; accepts 3.0V–6.0V with internal overvoltage protection.
2	GND	Power ground reference for regulator feedback and internal circuits.
3	NC	No internal connection - must be left floating or grounded per layout best practices.
4	CE	Active-high enable input; logic high (>1.5V) enables regulation, low (<0.4V) places device in ultra-low-power shutdown.
5	VOUT	Regulated 2.5V output; requires ≥1µF ceramic capacitor for stability and transient response.

Key Features

Feature	Design Value
Ultra-low noise output	50µV_rms enables clean power for RF transceivers and high-resolution ADCs without external filtering.
Enable-controlled shutdown	0.01µA standby current allows system-level power gating for energy harvesting or battery longevity.
Low-ESR capacitor compatible	Stable with 1µF ceramic output capacitor - eliminates need for bulky tantalum or electrolytic types.
High line/load regulation	≤15mV variation over full load (1–300mA) and input range - reduces need for post-regulation trimming.
Over-temperature protection	Auto-shutdown at +160°C with +25°C hysteresis - prevents thermal runaway during short-circuit or ambient overheating.

Applications

CDMA/GSM Cellular Handsets

Battery-Powered Equipment

Use Scenario: Powering RF transceiver VCO and PLL circuitry in dual-mode mobile handsets.

IC Role / Device Role / Timing Role: Low-noise 2.5V supply for phase-locked loop reference voltage and local oscillator biasing.

Use Value: 50µV_rms noise minimizes phase jitter and adjacent-channel interference in GSM transmit paths.

Use Scenario: Supplying real-time clock (RTC) and backup memory in handheld medical monitors.

IC Role / Device Role / Timing Role: Primary regulated rail for timekeeping ICs and SRAM during main battery depletion.

Use Value: 0.01µA standby current extends backup runtime beyond 1 year on coin-cell batteries.

Laptops & Notebook Computers

Hand-Held Instruments

Use Scenario: Providing clean 2.5V bias to audio codec and touch controller in ultrabook platforms.

IC Role / Device Role / Timing Role: Secondary LDO stage decoupling switched-mode power supply ripple before analog signal processing blocks.

Use Value: 65dB PSRR at 100Hz–1kHz suppresses audible switching noise in headphone amplifiers.

Use Scenario: Regulating power for 24-bit delta-sigma ADC and precision op-amps in portable DMMs.

IC Role / Device Role / Timing Role: Precision voltage source for ADC reference buffer and sensor excitation circuitry.

Use Value: ±2% output accuracy and <±100ppm/°C drift ensure measurement repeatability across industrial temperature ranges.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-2502E/TT	250mA max output, 175mV dropout at 250mA, 30µV_rms noise, SOT-23-3 package	Lacks enable pin; no shutdown mode - unsuitable for dynamic power sequencing	Select when board space is constrained and enable control is unnecessary.
Torex XC6206P252MR-G	300mA max output, 120mV dropout at 100mA, 40µV_rms noise, SOT-23-5 package	Fixed 2.5V output but no CE pin - limited to always-on configurations	Choose for cost-sensitive designs where ultra-low dropout is less critical than noise.

Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the AP2125N-2.5TRG1 uniquely combines 300mA capability, 65mV dropout, active enable control, and 50µV_rms noise - making it optimal for battery-powered systems requiring both efficiency and signal integrity.

Availability

AP2125N-2.5TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handsets, portable medical devices, notebook audio subsystems, and handheld test equipment requiring stable component supply with consistent parametric performance across production lots.

Supply support for AP2125N-2.5TRG1 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance, energy-efficient components for consumer, computing, industrial, and automotive markets.

The AP2125 series belongs to Diodes' precision LDO regulator product line, engineered specifically for ultra-low-noise, low-quiescent-current power delivery in space-constrained, battery-operated applications.

FAQ

What is the minimum input voltage required for stable 2.5V output?

The AP2125N-2.5TRG1 requires VIN ≥ VOUT + 0.5V = 3.0V for guaranteed regulation across temperature and load. At 100mA output, dropout is only 65mV, so operation down to 2.565V is possible - but 3.0V is the recommended minimum per datasheet specifications to ensure full performance compliance.

Can AP2125N-2.5TRG1 be used with ceramic capacitors smaller than 1µF?

No - the datasheet specifies ≥1µF ceramic output capacitance for stability and transient response. Using smaller values risks oscillation or excessive output voltage overshoot during load steps. Input capacitance also requires ≥1µF ceramic; ESR must remain below 1Ω across the operating frequency range.

Does the NC pin (Pin 3) require any PCB routing or grounding?

Pin 3 is internally unconnected and must not be tied to any net. It may be left floating or optionally grounded for mechanical stability - but grounding does not affect electrical performance. Do not route signals or power traces to this pin, as it has no internal bond wire or die connection.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches +160°C, the AP2125N-2.5TRG1 disables output and enters thermal shutdown. It remains off until temperature drops by +25°C hysteresis (to ~+135°C), then automatically resumes regulation. This cycle repeats if overload persists, protecting the IC without requiring external reset circuitry.

AP2125N-2.5TRG1 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):: 2.5V

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-2.5TRG1 FAQ

1.How can I place an order for AP2125N-2.5TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2125N-2.5TRG1 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-2.5TRG1 reliable?

The price and inventory of AP2125N-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125N-2.5TRG1 is usually 5 days.

3.What payment methods are accepted for AP2125N-2.5TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-2.5TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2125N-2.5TRG1?

AP2125N-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2125N-2.5TRG1 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-2.5TRG1?

For technical support, including AP2125N-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-2.5TRG1 requirements.

6.How does Aetrix verify that AP2125N-2.5TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2125N-2.5TRG1 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-2.5TRG1 meets industry standards.

7.What is the process for return or replacement of AP2125N-2.5TRG1?

All AP2125N-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-2.5TRG1, 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-2.5TRG1 part is unused and in its original packaging.

Return procedure for AP2125N-2.5TRG1:

1.Submit a request within 90 days.

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

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