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Diodes Incorporated AP2125K-3.3TRE1
- Part No.:
- AP2125K-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2125K-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
AP2125K-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 active-high enable control. It delivers stable power to noise-sensitive analog circuitry in compact battery-powered systems.
For engineers reviewing the AP2125K-3.3TRE1 datasheet, AP2125K-3.3TRE1 pinout, AP2125K-3.3TRE1 application, or AP2125K-3.3TRE1 equivalent, key selection criteria include ultra-low noise performance, sub-100mV dropout under load, 0.01µA shutdown current, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The AP2125K-3.3TRE1 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V output, CE-controlled enable logic, current-limit protection, and thermal shutdown circuitry. Its CMOS architecture enables low quiescent current (60µA typical) and eliminates need for external bypass capacitors to suppress noise.
It operates across input voltages from 3.8V to 6V (VOUT + 0.5V min), supports output currents up to 300mA, and maintains regulation over –40°C to +85°C ambient. The device uses internal compensation and requires only 1µF input and output ceramic capacitors for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures reliable biasing of 3.3V logic, ADCs, and RF front-ends without post-regulation trimming |
| Max Output Current | 300mA minimum - sufficient to power microcontrollers, sensors, and interface ICs in portable designs |
| Dropout Voltage | 65mV at 100mA - enables operation from single-cell Li-ion (3.4V min) or two-cell alkaline sources with margin |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - preserves signal integrity in audio codecs, precision ADCs, and PLL VCO supplies |
| 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 states enabled via CE pin |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply connection; accepts 3.8V–6V with ≥0.5V headroom above VOUT for regulation |
| 2 | GND | Analog ground reference; must be low-impedance return path shared with CIN/COUT ground pads |
| 3 | CE | Active-high enable; drives high (>1.5V) to activate regulator, low (<0.4V) to enter 0.01µA shutdown |
| 4 | NC | No internal connection; electrically isolated - may be left floating or tied to GND for mechanical stability |
| 5 | VOUT | Regulated 3.3V output; requires 1µF ceramic capacitor to GND within 3mm for transient stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 50µVrms enables direct powering of RF synthesizers and high-resolution SAR ADCs without added filtering |
| Low dropout at full load | 200mV at 300mA allows use with weak input sources such as aging batteries or high-impedance DC/DC outputs |
| Enable-controlled shutdown | 0.01µA standby current permits firmware-managed power gating of subsystems in multi-rail architectures |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R ceramics on input/output - eliminates cost, size, and reliability penalties of tantalum |
| Thermal shutdown with hysteresis | +160°C trip with +25°C hysteresis prevents cycling during sustained overload while allowing safe recovery |
Applications
| Portable Medical Sensors | Industrial Handheld Meters |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE radio and low-power op-amp front-end. IC Role / Device Role / Timing Role: Primary 3.3V supply for BLE SoC, analog sensor signal chain, and EEPROM. Use Value: 50µVrms noise prevents baseline drift in µV-level bio-potential measurements; 60µA IQ extends 2-week battery life. | Use Scenario: Ruggedized multimeter with LCD display, precision ADC, and isolated RS-485 interface. IC Role / Device Role / Timing Role: Clean 3.3V rail for 24-bit delta-sigma ADC reference and microcontroller core logic. Use Value: ±2% output accuracy ensures <0.1% measurement error floor; 65mV dropout sustains regulation during 9V battery discharge to 6.5V. |
| Wireless IoT Edge Nodes | Automotive Cabin Infotainment Accessories |
Use Scenario: Battery-powered Zigbee temperature/humidity node with wake-on-event MCU and digital sensor. IC Role / Device Role / Timing Role: Always-on 3.3V supply enabling fast wake-from-sleep response and sensor data acquisition. Use Value: 0.01µA shutdown current limits annual self-discharge to <1% of CR2032 capacity; CE pin synchronizes with MCU GPIO. | Use Scenario: USB-powered car mount with GPS receiver, touch controller, and display driver IC. IC Role / Device Role / Timing Role: Secondary 3.3V regulator decoupling noisy USB 5V input for GPS baseband and touchscreen ASIC. Use Value: 65dB PSRR at 100kHz attenuates USB switch-mode noise; thermal shutdown protects against enclosure overheating. |
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 at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; limited to lower-current, non-critical rails | Select when board space is constrained and enable/shutdown not required |
| TLS850F3BXTMA1 | 500mA output, integrated watchdog and reset, AEC-Q100 Grade 1, 125°C junction rating | Automotive-qualified with system monitoring features; higher cost and larger TSON-10 package | Select for automotive cabin modules requiring functional safety support and extended temperature range |
Compared with MCP1700T-3302E/TT, AP2125K-3.3TRE1 provides 20% higher current capability, enable control, and thermal protection; versus TLS850F3BXTMA1, it offers lower noise and smaller footprint but lacks automotive qualification and system supervision functions.
Availability
AP2125K-3.3TRE1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld meters, wireless IoT edge nodes, and automotive cabin infotainment accessories requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP2125K-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP2125 series belongs to Diodes' precision LDO portfolio, designed specifically for battery-powered and noise-sensitive applications where ultra-low noise, low dropout, and minimal quiescent current are critical system requirements.
FAQ
What is the minimum input voltage required for regulation at 300mA load?
The AP2125K-3.3TRE1 requires VIN ≥ VOUT + VDROP. At 300mA, typical dropout is 200mV, so minimum input is 3.3V + 0.2V = 3.5V. Absolute minimum per datasheet is VOUT + 0.5V = 3.8V to guarantee regulation across temperature and process variation.
Can AP2125K-3.3TRE1 be used with 2.2µF ceramic output capacitors?
Yes - the device is stable with ceramic capacitors from 1µF to 10µF and ESR down to 5mΩ. A 2.2µF X5R capacitor improves load transient response versus 1µF and remains within the stable region shown in the ESR vs. output current plot (DS38144, p.15).
Does the NC pin (Pin 4) require any PCB layout treatment?
No. Pin 4 is unconnected internally and may be left floating. For mechanical robustness in automated assembly, it may be tied to GND copper pour, but no electrical connection is needed or recommended.
How does thermal shutdown behave during continuous overload?
When junction temperature reaches +160°C, the device shuts down output and holds off until temperature drops by +25°C hysteresis (to ~+135°C), then resumes regulation. This prevents destructive thermal cycling and allows safe recovery once fault condition is removed.
AP2125K-3.3TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2125K-3.3TRE1 FAQ
1.How can I place an order for AP2125K-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125K-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 AP2125K-3.3TRE1 reliable?
The price and inventory of AP2125K-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 AP2125K-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125K-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125K-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125K-3.3TRE1?
AP2125K-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125K-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 AP2125K-3.3TRE1?
For technical support, including AP2125K-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125K-3.3TRE1 requirements.
6.How does Aetrix verify that AP2125K-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125K-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 AP2125K-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125K-3.3TRE1?
All AP2125K-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125K-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 AP2125K-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2125K-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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