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Diodes Incorporated AP2125KS-2.8TRG1
- Part No.:
- AP2125KS-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
AP2125KS-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,997
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Product details
Overview
AP2125KS-2.8TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, ±2% output voltage accuracy, and 65mV dropout at 100mA - optimized for powering RF sections and analog circuitry in space-constrained battery-powered devices.
For engineers reviewing the AP2125KS-2.8TRG1 datasheet, AP2125KS-2.8TRG1 pinout, AP2125KS-2.8TRG1 application, or AP2125KS-2.8TRG1 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 at +160°C.
Technical Context
The AP2125KS-2.8TRG1 integrates a CMOS pass transistor, precision voltage reference, error amplifier, resistor network for fixed 2.8V output, active-high CE control, over-temperature shutdown (OTSD), and current-limit protection. Its architecture delivers stable regulation under fast load transients 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 with output currents up to 300mA while consuming only 60µA quiescent current - enabling long battery life in portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for 2.8V logic rails and analog sensors without external feedback. |
| Max Output Current | 300mA minimum - sufficient to power baseband processors, RF front-ends, or multiple low-power peripherals. |
| Dropout Voltage | 65mV at 100mA - enables operation from single-cell Li-ion (3.0–3.6V) or two-cell alkaline (3.0V) with minimal headroom loss. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - critical for noise-sensitive applications like ADC references and RF synthesizers. |
| PSRR | 65dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 60µA typical - minimizes battery drain during active operation in always-on sensor nodes. |
| Standby Current | 0.01µA typical - extends shelf life and runtime in deep-sleep modes of wearable devices. |
Pinout & Package
AP2125KS-2.8TRG1 uses the SC-70-5 surface-mount package (1.6mm × 1.6mm × 0.6mm), optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply connection - accepts 3.3V to 6V; requires 1µF ceramic input capacitor for stability. |
| 2 | GND | Power ground reference - must be connected to low-impedance system ground plane to minimize noise coupling. |
| 3 | NC | No internal connection - left unconnected; no routing or soldering required. |
| 4 | CE | Active-high enable input - drives high (>1.5V) to activate regulator; pulls low (<0.4V) to enter 0.01µA shutdown mode. |
| 5 | VOUT | Regulated 2.8V output - requires 1µF ceramic output capacitor with ESR <1Ω for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 50µVrms enables clean power for RF ICs and precision analog signal chains without additional filtering. |
| Low dropout voltage | 65mV at 100mA allows efficient operation from marginal input sources such as aging batteries or post-DC/DC ripple. |
| Enable-controlled shutdown | 0.01µA standby current supports microcontroller-driven power sequencing and rapid wake-up in IoT endpoints. |
| Ceramic capacitor compatible | Stable with 1µF low-ESR ceramic output caps - eliminates need for bulkier, less reliable tantalum or electrolytic types. |
| Thermal and current protection | Integrated OTSD (+160°C trigger, +25°C hysteresis) and 50mA short-circuit limit prevent damage during fault conditions. |
Applications
| Cellular Baseband Power | Wearable Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor core and memory in GSM/CDMA handsets where supply noise directly impacts bit error rate. IC Role / Device Role / Timing Role: Primary 2.8V LDO delivering regulated power to digital baseband ICs with tight noise and transient response requirements. Use Value: 50µVrms noise and 65dB PSRR reduce conducted EMI into sensitive RF receivers, improving receiver sensitivity by up to 3dB. | Use Scenario: Supplies 2.8V to MEMS accelerometers, optical heart-rate sensors, and BLE radio in fitness trackers. IC Role / Device Role / Timing Role: System-level power rail generator enabling coordinated sleep/wake cycles via CE pin control. Use Value: 0.01µA shutdown current extends battery life beyond 6 months in intermittent-sampling wearables. |
| Portable Medical Monitor | Industrial Handheld Terminal |
Use Scenario: Provides clean 2.8V bias to analog front-end (AFE) and ADC in portable ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Low-noise analog power source ensuring <12-bit effective resolution in medical-grade signal acquisition. Use Value: ±2% output accuracy and ±100ppm/°C tempco maintain calibration integrity across clinical operating temperatures (-20°C to +55°C). | Use Scenario: Powers barcode scanner module, display driver, and MCU in ruggedized handheld terminals used in warehouse logistics. IC Role / Device Role / Timing Role: Main system LDO supporting mixed-signal loads with robust thermal protection in high-ambient environments. Use Value: +160°C thermal shutdown prevents latch-up during extended operation in hot industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-2.8TRG1 | SOT-23-5 package (same pinout, larger footprint than SC-70-5); identical electrical specs. | Better thermal dissipation (θJA = 200°C/W vs. 300°C/W) - preferred for >200mA continuous loads. | Select when board layout allows larger SOT-23-5 and thermal margin is critical. |
| MCP1700T-2802E/TT | 250mA max output; 175mV dropout at 250mA; 30µVrms noise; SOT-23-3 (3-pin, no CE). | No enable control or thermal shutdown; lower current capacity limits use in higher-power subsystems. | Choose only for cost-sensitive, low-current, always-on applications without sequencing needs. |
Compared with AP2125KS-2.8TRG1, the AP2125K-2.8TRG1 offers superior thermal performance in the same functional family, while the MCP1700T-2802E/TT trades off enable functionality and current capability for smaller size and lower cost - making it suitable only for simpler, lower-power designs.
Availability
AP2125KS-2.8TRG1 is available at Aetrix Electronics and suitable for cellular handset power management, wearable sensor hubs, portable medical monitors, and industrial handheld terminals requiring stable component supply with full RoHS/Green compliance.
Supply support for AP2125KS-2.8TRG1 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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP2125 series belongs to Diodes' ultra-low-noise LDO product line, engineered specifically for noise-sensitive battery-powered applications where clean, accurate, and efficiently regulated voltage is essential.
FAQ
What is the minimum input voltage required for AP2125KS-2.8TRG1 to regulate at 2.8V?
The AP2125KS-2.8TRG1 requires VIN ≥ VOUT + 0.5V = 3.3V for guaranteed regulation across temperature and load. At 100mA, its dropout is 65mV, but the recommended minimum input is 3.3V per datasheet operating conditions to ensure stability and accuracy over -40°C to +85°C.
Can AP2125KS-2.8TRG1 be used with a 10µF ceramic output capacitor?
Yes - the AP2125KS-2.8TRG1 is compatible with ceramic capacitors ranging from 1µF to 10µF, provided ESR remains below 1Ω. A 10µF X5R/X7R ceramic cap improves load transient response and reduces output ripple, especially under dynamic current steps up to 300mA.
Does AP2125KS-2.8TRG1 require an input capacitor?
Yes - a minimum 1µF ceramic input capacitor is required per the datasheet to suppress high-frequency noise and prevent oscillation. It must be placed within 5mm of the VIN and GND pins, with low-inductance layout, to ensure stability under all operating conditions including fast load transients.
Is the NC pin on AP2125KS-2.8TRG1 electrically connected internally?
No - Pin 3 (NC) is not connected to any internal circuitry. It must remain unconnected on the PCB; no trace, solder, or pull-up/down resistor should be applied. This pin exists solely for mechanical symmetry in the SC-70-5 package and has zero electrical function.
AP2125KS-2.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 2.8V
- 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-70-5
AP2125KS-2.8TRG1 FAQ
1.How can I place an order for AP2125KS-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KS-2.8TRG1 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 AP2125KS-2.8TRG1 reliable?
The price and inventory of AP2125KS-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KS-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KS-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KS-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KS-2.8TRG1?
AP2125KS-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KS-2.8TRG1 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 AP2125KS-2.8TRG1?
For technical support, including AP2125KS-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KS-2.8TRG1 requirements.
6.How does Aetrix verify that AP2125KS-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KS-2.8TRG1 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 AP2125KS-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KS-2.8TRG1?
All AP2125KS-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KS-2.8TRG1, 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 AP2125KS-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125KS-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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