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Diodes Incorporated AP2125N-3.3TRE1
- Part No.:
- AP2125N-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2125N-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,437
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Product details
Overview
AP2125N-3.3TRE1 from Diodes Incorporated is a 300mA, fixed-output 3.3V CMOS low-dropout (LDO) regulator in SOT-23-5 package, featuring 65mV dropout at 100mA, ±2% output voltage accuracy, 50µVrms output noise, and 0.01µA standby current. It integrates over-temperature shutdown, current limiting, and active-high enable control-designed for power-sensitive battery-operated systems requiring clean, stable 3.3V rail generation.
For engineers reviewing the AP2125N-3.3TRE1 datasheet, AP2125N-3.3TRE1 pinout, AP2125N-3.3TRE1 application, or AP2125N-3.3TRE1 equivalent, key selection criteria include ultra-low noise performance for RF/analog circuitry, compatibility with ceramic output capacitors down to 1µF, and precise thermal shutdown behavior at +160°C with +25°C hysteresis.
Technical Context
The AP2125N-3.3TRE1 employs a CMOS-based error amplifier architecture with internal voltage reference and resistor network for fixed 3.3V output regulation. Its control loop maintains stability with low-ESR ceramic capacitors and delivers high PSRR (65dB typical at 1kHz) across input voltages from 4.3V to 6V.
Thermal protection uses a dedicated junction temperature sensor triggering shutdown at +160°C with +25°C hysteresis, while the CE pin enables logic-controlled on/off operation with 1.5V high-threshold and 0.4V low-threshold. Output current capability remains ≥300mA across -40°C to +85°C ambient range under recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures reliable 3.3V logic rail compliance for microcontrollers and sensors |
| Max Output Current | 300mA min - supports moderate-power peripherals like USB PHYs or small displays |
| Dropout Voltage | 65mV @ 100mA - enables operation with only 3.365V input, critical for single-cell Li-ion or Li-poly systems |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - minimizes interference in precision analog/RF signal chains |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring applications |
| Standby Current | 0.01µA typical - enables nanoamp-level shutdown state for long-term storage modes |
| PSRR | 65dB @ 1kHz - suppresses switching noise from upstream DC-DC converters |
| Thermal Shutdown | +160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant "Green" finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 4.3V–6V for 3.3V output regulation |
| 2 | GND | Analog/digital ground reference; must be low-impedance path to minimize noise coupling |
| 3 | CE | Active-high enable input; drives IC into 0.01µA shutdown when pulled ≤0.4V |
| 4 | NC | No internal connection; electrically isolated, may be left floating or grounded per layout needs |
| 5 | VOUT | Regulated 3.3V output; requires ≥1µF ceramic capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables use in RF front-ends and precision ADC reference supplies |
| Ceramic capacitor compatible | Stable with ≥1µF X5R/X7R ceramic output caps-eliminates need for bulkier, less reliable electrolytics |
| High PSRR at audio frequencies | 65dB rejection at 1kHz suppresses ripple from buck converter switching artifacts |
| Sub-µA shutdown mode | 0.01µA standby current allows multi-year battery life in IoT endpoint sleep states |
| Fixed 3.3V output accuracy | ±2% tolerance over full temperature and load range reduces need for external trimming |
Applications
| Wireless Sensor Node Power | GSM Modem Core Supply |
|---|---|
Use Scenario: Continuous environmental sensing with BLE/Wi-Fi transmission bursts every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying MCU, radio transceiver, and analog sensor interface. Use Value: 50µVrms noise prevents RF desensitization; 0.01µA shutdown extends CR2032 battery life beyond 3 years. |
Use Scenario: Compact GSM module powering baseband processor and PA bias rails. IC Role / Device Role / Timing Role: Clean 3.3V core supply decoupled from noisy DC-DC converter feeding PA stage. Use Value: 65dB PSRR at 1kHz isolates digital switching noise from sensitive receive chain. |
| Industrial Handheld Scanner | Medical Pulse Oximeter |
Use Scenario: Battery-powered barcode scanner with laser diode driver and image sensor. IC Role / Device Role / Timing Role: Regulated 3.3V rail for FPGA configuration, sensor interface, and display controller. Use Value: 65mV dropout allows operation down to 3.365V input-maximizing usable capacity of 3.7V Li-ion cell. |
Use Scenario: Portable pulse oximeter requiring ultra-low-noise analog front-end for photodiode signals. IC Role / Device Role / Timing Role: Dedicated low-noise 3.3V supply for ADC reference and op-amp biasing. Use Value: 50µVrms output noise avoids baseline drift and improves SpO₂ measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | 250mA max output, 175mV dropout @ 250mA, 30µVrms noise, SOT-23-3 (3-pin) | Lacks enable pin and thermal shutdown; limited current headroom for burst-mode loads | Select when board space is constrained and enable/shutdown not required |
| TCS2125-3.3 | 300mA output, 120mV dropout @ 100mA, 65µVrms noise, SC-70-5 package | Higher dropout limits use with lower-input-voltage sources; same noise but larger thermal resistance (300°C/W) | Choose only if SC-70-5 footprint is mandatory and thermal derating is acceptable |
Compared with MCP1700T-3302E/TT and TCS2125-3.3, the AP2125N-3.3TRE1 uniquely combines sub-100mV dropout, integrated enable, thermal shutdown, and 50µVrms noise in a standard SOT-23-5 package-making it optimal for compact, battery-critical designs demanding both efficiency and signal integrity.
Availability
AP2125N-3.3TRE1 is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial handheld scanners, medical pulse oximeters, and GSM modem core supplies requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for AP2125N-3.3TRE1 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 devices, with emphasis on power management, signal integrity, and connectivity solutions for industrial, computing, and consumer markets.
The AP2125 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics where ultra-low noise, minimal quiescent current, and robust thermal protection are essential.
FAQ
What is the minimum input voltage required for stable 3.3V output at 300mA?
The AP2125N-3.3TRE1 requires VIN ≥ VOUT + VDROP. At 300mA, typical dropout is 200mV (max 300mV), so minimum input is 3.5V. For guaranteed 300mA operation across temperature, maintain VIN ≥ 3.6V per datasheet recommendations.
Can the NC pin (Pin 4) be connected to ground or left floating?
Pin 4 is internally unconnected and electrically isolated. It may be left floating or tied to GND without affecting regulation, noise, or thermal performance-common practice for mechanical stability or ESD mitigation in high-density layouts.
Does this LDO require an input capacitor, and if so, what value and type?
Yes-an input capacitor ≥1µF ceramic (X5R/X7R) is required for stability and transient suppression. The datasheet specifies CIN = 1µF in all test conditions; larger values (e.g., 2.2µF) improve line transient response without compromising stability.
How does the CE pin behave during power-up, and is an external pull-up needed?
The CE pin has no internal pull-up; it defaults to high-impedance. To ensure startup, an external 100kΩ pull-up to VIN is recommended. Without it, undefined CE voltage may cause delayed or failed enable, especially in systems with slow-rising input rails.
AP2125N-3.3TRE1 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):
- 3.3V
- 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-3.3TRE1 FAQ
1.How can I place an order for AP2125N-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125N-3.3TRE1 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-3.3TRE1 reliable?
The price and inventory of AP2125N-3.3TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125N-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125N-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125N-3.3TRE1?
AP2125N-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125N-3.3TRE1 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-3.3TRE1?
For technical support, including AP2125N-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-3.3TRE1 requirements.
6.How does Aetrix verify that AP2125N-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125N-3.3TRE1 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-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125N-3.3TRE1?
All AP2125N-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-3.3TRE1, 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-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2125N-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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