My Inquiry
My Account
Diodes Incorporated AP2125N-2.8TRG1
- Part No.:
- AP2125N-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2125N-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,854
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2125N-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 noise-sensitive RF and analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2125N-2.8TRG1 datasheet, AP2125N-2.8TRG1 pinout, AP2125N-2.8TRG1 application, or AP2125N-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 AP2125N-2.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, active-high enable (CE) logic interface, current-limit protection, and over-temperature shutdown (OTSD). Its CMOS architecture 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 (VOUT + 0.5)V up to 6V, and maintains load regulation within ±11mV over 1–300mA output current - critical for maintaining signal integrity in power rails feeding ADCs, RF transceivers, and low-power microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for 2.8V I/O domains and analog front-ends without external feedback. |
| Max Output Current | 300mA minimum - sufficient to power baseband processors, sensor hubs, or dual-rail PMIC subsystems. |
| Dropout Voltage | 65mV at 100mA - enables operation from single-cell Li-ion (3.0–3.6V) with >0.2V headroom margin. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and quantization error in 12-bit+ ADCs. |
| 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 sensor nodes and wearable standby modes. |
| Standby Current | 0.01µA typical - reduces leakage during system sleep when CE = low. |
| Thermal Shutdown | Activates at +160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
AP2125N-2.8TRG1 uses the SC-70-5 surface-mount package (1.6mm × 1.6mm × 0.55mm), 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 3.3V–6V input with ≥0.5V headroom above 2.8V output. |
| 2 | GND | Analog ground reference; must be connected to low-impedance PCB ground plane for noise control. |
| 3 | NC | No internal connection; left unconnected per datasheet - no routing or soldering required. |
| 4 | CE | Active-high enable; drives high (>1.5V) to activate regulator, low (<0.4V) to enter 0.01µA shutdown mode. |
| 5 | VOUT | Regulated 2.8V output; requires 1µF ceramic capacitor (X5R/X7R) placed ≤2mm from pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for RF ICs and precision analog circuits without additional filtering. |
| CMOS process architecture | Delivers 60µA quiescent current and 0.01µA shutdown current - critical for multi-year battery life in IoT endpoints. |
| Low-ESR capacitor compatibility | Stable with 1µF ceramic output capacitors (no tantalum or electrolytic required), reducing BOM cost and board area. |
| Integrated protection | Combines current limiting (50mA short-circuit limit), thermal shutdown (+160°C), and overvoltage-safe CE input (−0.3V to VIN+0.3V). |
| High PSRR at audio frequencies | 65dB rejection at 1kHz suppresses ripple from buck converter switching edges that fall in sensitive audio band. |
Applications
| CDMA/GSM Handset RF Power Amplifier Bias | Laptop USB-C Port Controller Supply |
|---|---|
|
Use Scenario: Provides clean 2.8V bias to GaAs power amplifier stages in cellular handsets where switching noise degrades EVM and ACLR. IC Role / Device Role / Timing Role: Low-noise post-regulator for PA drain voltage, decoupling noisy DC/DC outputs. Use Value: 50µVrms noise and 65dB PSRR prevent AM-to-PM distortion and maintain 3GPP-compliant spectral mask performance. |
Use Scenario: Powers USB-C port controller (e.g., TUSB1210) requiring stable 2.8V for CC logic and VCONN generation. IC Role / Device Role / Timing Role: Dedicated LDO for USB PD policy engine, enabling fast enable/disable via CE pin during plug detection. Use Value: 0.01µA shutdown current minimizes battery drain during cable-unplugged state; ±2% accuracy ensures reliable CC line voltage thresholds. |
| Hand-Held Medical Sensor Node | PCMCIA Card Analog Front-End |
|
Use Scenario: Supplies 2.8V to low-power biosensor signal chain (ECG/SpO₂ ADC, op-amps) in disposable wearable patches. IC Role / Device Role / Timing Role: Primary analog rail regulator with thermal shutdown protecting against skin-contact overheating. Use Value: SC-70-5 footprint saves space on compact flex PCBs; 65mV dropout extends usable battery range down to 2.85V cell voltage. |
Use Scenario: Powers precision op-amps and multiplexers in legacy PCMCIA data acquisition cards interfacing with industrial sensors. IC Role / Device Role / Timing Role: Local LDO for analog section, isolating sensitive measurement circuitry from noisy host bus power. Use Value: ±100ppm/°C tempco and ±2% initial accuracy ensure consistent gain calibration across −40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 250mA max output, 175mV dropout at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; limited to lower-current, non-safety-critical roles | Select when board space is constrained to 3-pin footprint and full protection is not required. |
| Torex XC6206P282MR-G | 300mA output, 150mV dropout at 100mA, 40µVrms noise, SOT-25 package (same pinout as SC-70-5) | No CE pin; fixed-on operation only - unsuitable for dynamic power gating | Choose for ultra-low-noise applications where enable control is unnecessary and thermal shutdown is secondary. |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the AP2125N-2.8TRG1 uniquely combines 300mA capability, active enable, thermal shutdown, and sub-60µVrms noise in a 5-pin SC-70 package - making it the only option supporting both high-reliability power gating and RF-grade cleanliness in minimal area.
Availability
AP2125N-2.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable medical instrumentation, USB-C port controller power, and PCMCIA card analog subsystems requiring stable component supply with full RoHS/Green compliance.
Supply support for AP2125N-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 semiconductor company 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 battery-powered portable electronics demanding ultra-low noise, low dropout, and robust protection in miniature packages.
FAQ
What is the minimum input voltage required for AP2125N-2.8TRG1 to regulate 2.8V output?
The recommended minimum input voltage is VOUT + 0.5V = 3.3V, per the datasheet's Recommended Operating Conditions. At lower inputs (e.g., 3.0V), regulation may be lost due to insufficient headroom - especially under 100mA load where dropout reaches 65mV. Operation below 3.3V is not guaranteed across temperature or process variation.
Can AP2125N-2.8TRG1 be used with a 0.47µF output capacitor?
No - the datasheet specifies 1µF minimum ceramic output capacitance (X5R/X7R) for stability. Using 0.47µF risks oscillation or poor transient response, particularly under load steps. The ESR vs. output current plot (Fig. 15) confirms stable operation only within the 1µF–10µF range with ESR < 100mΩ.
Does the NC pin (Pin 3) require PCB routing or grounding?
No - Pin 3 is explicitly designated "No Connection" in the datasheet pin description table (page 3). It must remain unconnected on the PCB: no trace, no pad tie, no grounding. Routing or connecting this pin may cause unpredictable behavior or violate qualification testing conditions.
How does the CE pin behave during power-up if left floating?
The CE pin has no internal pull-up or pull-down; if left floating, its voltage is undefined and may drift into the indeterminate region (0.4–1.5V), causing erratic enable/disable cycling or partial turn-on. A 100kΩ pull-up to VIN is required for reliable power-on default activation, as confirmed in the functional block diagram and application circuit (page 3).
AP2125N-2.8TRG1 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):
- 2.8V
- 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:
- -
- 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-2.8TRG1 FAQ
1.How can I place an order for AP2125N-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125N-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 AP2125N-2.8TRG1 reliable?
The price and inventory of AP2125N-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 AP2125N-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125N-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125N-2.8TRG1?
AP2125N-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125N-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 AP2125N-2.8TRG1?
For technical support, including AP2125N-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-2.8TRG1 requirements.
6.How does Aetrix verify that AP2125N-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125N-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 AP2125N-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125N-2.8TRG1?
All AP2125N-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-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 AP2125N-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125N-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2125N-2.8TRG1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…
Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …
Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
