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

Diodes Incorporated AP2125KC-2.5TRE1

Name: AP2125KC-2.5TRE1
Brand: Diodes Incorporated
SKU: AP2125KC-2.5TRE1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2125KC-2.5TRE1

Manufacturer:: Diodes Incorporated

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

Package:: SC-82

Datasheet:: AP2125KC-2.5TRE1.pdf

Description:: IC REG LINEAR 2.5V 300MA SC82

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP2125KC-2.5TRE1 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 powering noise-sensitive analog circuitry and RF sections in portable battery-powered systems.

For engineers reviewing the AP2125KC-2.5TRE1 datasheet, AP2125KC-2.5TRE1 pinout, AP2125KC-2.5TRE1 application, or AP2125KC-2.5TRE1 equivalent, key selection criteria include ultra-low noise performance, enable-controlled shutdown with 0.01µA standby current, compatibility with ceramic output capacitors, and thermal shutdown protection at +160°C.

Technical Context

The AP2125KC-2.5TRE1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.5V output, active-high enable (CE) input, overcurrent limit, and overtemperature shutdown (OTSD). Its CMOS process enables low quiescent current (60µA typical) and stable operation with 1µF ceramic capacitors on input and output.

It operates across -40°C to +85°C ambient temperature, supports input voltages from (V_OUT + 0.5)V up to 6V, and maintains load regulation within ±15mV over 1–300mA output current - critical for maintaining signal integrity in mixed-signal SoC power rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% - ensures stable biasing for ADC references and RF synthesizers without external feedback.
Max Output Current	300mA minimum - sufficient to power microcontroller cores, sensor interfaces, or wireless transceivers in compact devices.
Dropout Voltage	65mV at 100mA - enables operation from single-cell Li-ion (3.0–3.6V) or two-cell alkaline (up to 3.2V) with minimal headroom loss.
RMS Output Noise	50µV_rms (10Hz–100kHz) - preserves SNR in audio codecs, precision sensors, and PLL VCO supply domains.
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 IoT endpoints.
Standby Current	0.01µA typical with CE = low - enables deep-sleep modes in wearable and medical telemetry devices.

Pinout & Package

AP2125KC-2.5TRE1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for space-constrained portable designs. Pin assignments are validated per Diodes DS38144 Rev. 2–2.

Pin/Terminal	Circuit Role	Design Meaning
1	VIN	Input supply connection; accepts 3.0V–6V with ≥0.5V headroom above 2.5V output.
2	GND	Power ground reference; must be low-impedance path to minimize noise coupling into error amplifier.
3	NC	No internal connection; left unconnected per datasheet - not used for thermal pad or biasing.
4	CE	Active-high enable; logic high (>1.5V) activates regulator; logic low (<0.4V) disables output and reduces I_STD to 0.01µA.
5	VOUT	Regulated 2.5V output; requires ≥1µF ceramic capacitor (low ESR) for stability and transient response.

Key Features

Feature	Design Value
Ultra-low noise regulation	50µV_rms output noise enables clean power for RF front-ends and high-resolution ADCs without additional filtering.
CMOS-based low-I_Q	60µA quiescent current supports >1-year battery life in coin-cell-powered IoT sensors with 10µA average system load.
Enable-controlled shutdown	0.01µA standby current during CE = low allows firmware-controlled power gating of subsystems in multi-rail architectures.
Ceramic capacitor compatible	Stable with 1µF X5R/X7R ceramics on input/output - eliminates need for larger, less reliable tantalum or electrolytic capacitors.
Thermal and overcurrent protection	OTSD triggers at +160°C with +25°C hysteresis; short-circuit current limit of 50mA prevents damage during fault conditions.

Applications

Wireless Sensor Node Power

Portable Medical Monitor

Use Scenario: Powers BLE SoC and analog front-end in battery-operated environmental sensor node.

IC Role / Device Role / Timing Role: Primary 2.5V rail for RF transceiver and 16-bit ADC reference.

Use Value: 50µV_rms noise prevents degradation of RSSI accuracy and ADC ENOB; 65mV dropout extends usable battery range by 12% vs. legacy LDOs.

Use Scenario: Supplies ECG analog signal chain and microcontroller in handheld patient monitor.

IC Role / Device Role / Timing Role: Low-noise 2.5V source for instrumentation amplifier and SAR ADC reference buffer.

Use Value: ±2% output accuracy and ±100ppm/°C tempco ensure consistent gain calibration across clinical operating temperatures (-20°C to +50°C).

Smart Wearable Audio

Industrial Handheld Terminal

Use Scenario: Delivers clean 2.5V bias to MEMS microphone preamp and Class-D audio driver in smart earbud.

IC Role / Device Role / Timing Role: Dedicated low-noise LDO for audio signal path, isolated from noisy digital rails.

Use Value: 65dB PSRR at 1kHz attenuates switching noise from PMIC DC/DC converters, reducing audible hiss by >20dB.

Use Scenario: Provides regulated 2.5V for barcode scanner imager and secure element in ruggedized field terminal.

IC Role / Device Role / Timing Role: Fault-tolerant power source with OTSD and current limiting for mission-critical peripherals.

Use Value: Thermal shutdown at +160°C prevents latch-up during extended outdoor operation in direct sunlight; SC-70-5 footprint saves PCB area in dense module layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-2502E/TO	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; verify thermal derating at 300mA.
Torex XC6206P252MR-G	300mA max, 150mV dropout at 100mA, 40µV_rms noise, SOT-25 package	Requires 2.2µF output capacitor; higher dropout reduces usable input voltage range	Prefer for ultra-low-noise priority where 150mV dropout is acceptable and larger output cap fits layout.

Compared with MCP1700-2502E/TO and XC6206P252MR-G, AP2125KC-2.5TRE1 uniquely balances ultra-low noise (50µV_rms), low dropout (65mV), and integrated enable functionality in a 5-pin SC-70 package - making it optimal for space- and noise-constrained battery-powered systems requiring active power management.

Availability

AP2125KC-2.5TRE1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart wearable audio, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP2125KC-2.5TRE1 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, communications, and industrial markets.

The AP2125 series belongs to Diodes' precision LDO regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and minimal quiescent current.

FAQ

What is the minimum input voltage required for AP2125KC-2.5TRE1 to regulate 2.5V output?

The minimum input voltage is V_OUT + 0.5V = 3.0V, per Recommended Operating Conditions. Below this, dropout behavior occurs - output voltage drops linearly with input. At 100mA load, 65mV dropout means VIN ≥ 2.565V sustains regulation, but datasheet specifies 3.0V minimum for guaranteed performance across temperature and process variation.

Can AP2125KC-2.5TRE1 be used with a 10µF ceramic output capacitor?

Yes - the device is explicitly compatible with low-ESR ceramic capacitors from 1µF to 10µF. Larger values improve transient response and reduce output ripple, but do not affect stability. The SC-70-5 package's thermal resistance (300°C/W) requires attention to power dissipation when using >300mA loads at high ambient temperatures.

Does AP2125KC-2.5TRE1 require an input capacitor?

Yes - a minimum 1µF ceramic capacitor is required at VIN to ensure stability and suppress high-frequency noise from upstream sources. The datasheet shows stable operation with 1µF X5R/X7R types; placement within 2mm of VIN and GND pins is recommended to minimize parasitic inductance.

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. During power-up, if CE is left floating, the device may power up unpredictably due to noise coupling. For reliable startup, tie CE to VIN through a resistor or use a dedicated power-good signal. During brown-out, CE should be held low until input stabilizes above 3.0V to prevent erratic enable/disable cycling.

AP2125KC-2.5TRE1 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):: 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:: 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-2.5TRE1 FAQ

1.How can I place an order for AP2125KC-2.5TRE1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2125KC-2.5TRE1 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-2.5TRE1 reliable?

The price and inventory of AP2125KC-2.5TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-2.5TRE1 is usually 5 days.

3.What payment methods are accepted for AP2125KC-2.5TRE1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-2.5TRE1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2125KC-2.5TRE1?

AP2125KC-2.5TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2125KC-2.5TRE1 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-2.5TRE1?

For technical support, including AP2125KC-2.5TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-2.5TRE1 requirements.

6.How does Aetrix verify that AP2125KC-2.5TRE1 is sourced from the original manufacturer or authorized distributors?

All AP2125KC-2.5TRE1 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-2.5TRE1 meets industry standards.

7.What is the process for return or replacement of AP2125KC-2.5TRE1?

All AP2125KC-2.5TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-2.5TRE1, 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-2.5TRE1 part is unused and in its original packaging.

Return procedure for AP2125KC-2.5TRE1:

1.Submit a request within 90 days.

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

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