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Diodes Incorporated AP2125KC-2.5TRG1
- Part No.:
- AP2125KC-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
AP2125KC-2.5TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.5V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms 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.
For engineers reviewing the AP2125KC-2.5TRG1 datasheet, AP2125KC-2.5TRG1 pinout, AP2125KC-2.5TRG1 application, or AP2125KC-2.5TRG1 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-2.5TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.5V output, active-high CE input, current-limit protection, and over-temperature shutdown (OTSD). Its CMOS architecture enables low quiescent current (60µA typical) and high PSRR (65dB at 1kHz).
It operates across -40°C to +85°C ambient, supports input voltages from (VOUT + 0.5)V up to 6V, and maintains regulation under load currents from 1mA to 300mA. The device is optimized for use with low-ESR ceramic capacitors (1µF input/output recommended) and exhibits excellent line regulation (1mV typical) and load regulation (10mV typical).
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 microcontroller cores, sensors, and low-power transceivers. |
| Dropout Voltage | 65mV at 100mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.0V) sources. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - critical for preserving SNR in audio codecs and precision analog signal chains. |
| Quiescent Current | 60µA typical - extends battery life in always-on sensor nodes and wearable devices. |
| Standby Current | 0.01µA typical - enables nanoamp-level system sleep states when CE is low. |
| PSRR | 65dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Thermal Shutdown | +160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
AP2125KC-2.5TRG1 is housed in a 5-pin SC-70-5 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.0V–6V; requires 1µF ceramic decoupling. |
| 2 | GND | Analog ground reference; must be connected to low-impedance PCB ground plane. |
| 3 | CE | Active-high enable input; logic high (>1.5V) activates regulator; logic low (<0.4V) places IC in 0.01µA shutdown. |
| 4 | NC | No internal connection; left unconnected per datasheet; no routing required. |
| 5 | VOUT | Regulated 2.5V output; requires 1µF ceramic capacitor with ESR <1Ω for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for high-resolution ADCs and RF synthesizers. |
| CMOS-based low IQ | 60µA quiescent current minimizes static power loss in energy-harvesting and coin-cell applications. |
| Enable-controlled shutdown | 0.01µA standby current allows precise system-level power sequencing and deep-sleep control. |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R ceramics - eliminates need for larger, costlier tantalum or aluminum electrolytics. |
| Over-temperature protection | +160°C shutdown with +25°C hysteresis prevents thermal runaway during transient overloads or enclosure overheating. |
| High accuracy output | ±2% initial tolerance ensures reliable operation of voltage-referenced peripherals without external trimming. |
Applications
| Portable Medical Sensors | Wearable Biometric Monitors |
|---|---|
Use Scenario: Powering analog front-end (AFE) circuits in disposable glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Provides ultra-low-noise 2.5V reference and bias voltage for precision op-amps and 16-bit SAR ADCs. Use Value: 50µVrms noise preserves measurement resolution; ±2% accuracy avoids calibration drift across temperature. |
Use Scenario: Supplying core logic and sensor interface in wrist-worn heart rate monitors. IC Role / Device Role / Timing Role: Delivers regulated 2.5V to optical sensor drivers and low-power MCU I/O banks during intermittent activity bursts. Use Value: 65mV dropout enables >90% battery utilization from 3.0V nominal coin cells; 0.01µA shutdown extends shelf life. |
| Industrial IoT Edge Nodes | Low-Power Wireless Modules |
Use Scenario: Powering LoRaWAN or NB-IoT sensor nodes deployed in remote locations with 10+ year battery life targets. IC Role / Device Role / Timing Role: Supplies stable 2.5V to RF transceivers and microcontrollers during brief transmit/receive cycles. Use Value: 60µA quiescent current dominates system sleep power budget; CE pin enables synchronized wake-up with MCU GPIO. |
Use Scenario: Regulating power for Bluetooth LE SoCs and integrated antenna matching networks in compact modules. IC Role / Device Role / Timing Role: Acts as primary LDO for digital core and RF analog blocks, replacing less efficient linear regulators. Use Value: SC-70-5 footprint saves >40% board area vs. SOT-23-5; 65dB PSRR isolates RF section from noisy digital supply ripple. |
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, 120µA IQ, no CE pin | Lacks enable control and thermal shutdown; lower current rating limits use with higher-power peripherals | Choose only if enable functionality and 300mA headroom are unnecessary and cost is primary constraint |
| Torex XC6206P252MR-G | 300mA max output, 160mV dropout at 100mA, 1µA IQ, no thermal shutdown | Higher dropout reduces usable input range; lacks OTSD protection in thermally constrained enclosures | Select when ultra-low IQ dominates requirements and thermal margin is guaranteed by mechanical design |
Compared with MCP1700T-2502E/TT and XC6206P252MR-G, AP2125KC-2.5TRG1 uniquely combines 300mA capability, sub-100mV dropout, 0.01µA shutdown, and thermal protection in a 2.0×2.1mm SC-70-5 package-making it optimal for miniaturized, battery-critical, and safety-aware designs.
Availability
AP2125KC-2.5TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wearable biometric monitors, industrial IoT edge nodes, and low-power wireless modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP2125KC-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, 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- and battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for AP2125KC-2.5TRG1 to maintain regulation?
The AP2125KC-2.5TRG1 requires VIN ≥ VOUT + 0.5V = 3.0V to guarantee regulation across its full operating temperature range (-40°C to +85°C). At 25°C, it can regulate down to ~2.55V input due to lower dropout, but 3.0V is the recommended minimum for robust performance under worst-case conditions including temperature variation and load transients.
Can AP2125KC-2.5TRG1 be used with ceramic output capacitors smaller than 1µF?
No. The datasheet specifies 1µF ceramic (X5R/X7R) as the minimum stable output capacitance. Using smaller values risks instability, excessive output ripple, or oscillation due to insufficient phase margin. The device's compensation is optimized for ≥1µF with ESR <1Ω; reducing capacitance below this threshold invalidates the stability guarantee.
Does AP2125KC-2.5TRG1 require an input capacitor, and if so, what value is recommended?
Yes - a 1µF ceramic input capacitor is required and specified in all typical application circuits. It reduces high-frequency input ripple, improves transient response, and prevents potential oscillation caused by source impedance. Placement within 2mm of VIN and GND pins is critical; X5R/X7R dielectrics with ≤1Ω ESR are mandatory for stability.
How does the CE pin behave during power-up, and is an external pull-up required?
The CE pin has no internal pull-up; it is a high-impedance CMOS input. During power-up, if left floating, the state is undefined and may cause erratic enable/disable behavior. An external pull-up resistor (typically 100kΩ to VIN) is strongly recommended to ensure reliable startup into enabled state. Driving CE directly from a microcontroller GPIO is acceptable once the host is powered and initialized.
AP2125KC-2.5TRG1 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-2.5TRG1 FAQ
1.How can I place an order for AP2125KC-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-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 AP2125KC-2.5TRG1 reliable?
The price and inventory of AP2125KC-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 AP2125KC-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-2.5TRG1?
AP2125KC-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-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 AP2125KC-2.5TRG1?
For technical support, including AP2125KC-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-2.5TRG1 requirements.
6.How does Aetrix verify that AP2125KC-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-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 AP2125KC-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-2.5TRG1?
All AP2125KC-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-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 AP2125KC-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2125KC-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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