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Diodes Incorporated AP2122AK-2.5TRE1
- Part No.:
- AP2122AK-2.5TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-2.5TRE1.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,681
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Product details
Overview
AP2122AK-2.5TRE1 from Diodes Incorporated is a fixed-output 2.5V low-dropout linear regulator IC in SOT-23-5 package, delivering up to 150mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy. It integrates an active-high enable pin, internal pull-down resistor, and supports ceramic capacitors as low as 1µF for stable operation in space-constrained battery-powered systems.
For engineers reviewing the AP2122AK-2.5TRE1 datasheet, AP2122AK-2.5TRE1 pinout, AP2122AK-2.5TRE1 application, or AP2122AK-2.5TRE1 equivalent, key selection criteria include ultra-low noise performance, high PSRR (70dB @ 10kHz), sub-1µA standby current, and compatibility with low-ESR ceramic output capacitors in portable power rail regulation.
Technical Context
The AP2122AK-2.5TRE1 employs a CMOS-based error amplifier architecture with integrated voltage reference and resistor network for precise 2.5V output regulation. Its internal current-limit circuit provides short-circuit protection up to 50mA, while the built-in CE pull-down resistor (2.5–10MΩ) ensures defined shutdown state without external components.
Designed for high-transient-response operation, it achieves excellent load regulation (12mV typical) and line regulation (4mV typical), enabling stable power delivery under dynamic load conditions. The device operates across -40°C to +85°C junction temperature with input voltage range of 2V to 6V, supporting wide-input battery and intermediate rail applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures consistent biasing for ADC references and RF front-end LNA stages |
| Max Output Current | 150mA continuous - sufficient for powering microcontrollers, sensors, and small logic blocks |
| Dropout Voltage | 150mV typical @ 100mA - enables regulation from 2.65V input, extending battery runtime in single-cell Li-ion or alkaline systems |
| Output Noise | 30µVrms (10Hz–100kHz) - critical for noise-sensitive analog circuits like precision op-amps and audio codecs |
| PSRR | 70dB @ 10kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Quiescent Current | 25µA typical - minimizes standby power loss in always-on subsystems such as real-time clocks or wake-up controllers |
| Standby Current | 0.1µA typical - enables multi-year battery life in IoT endpoint sleep modes |
| Enable Threshold | CE "High" ≥1.5V, "Low" ≤0.25V - compatible with 1.8V/3.3V GPIOs without level-shifting |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, thermally enhanced pad design with θJA = 250°C/W and θJC = 73.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output voltage | Delivers stable 2.5V to load; requires ≥1µF ceramic capacitor for stability |
| 2 GND | Power ground reference | Low-impedance return path; must be connected directly to PCB ground plane |
| 3 VIN | Unregulated input supply | Accepts 2V–6V input; filtered by ≥1µF ceramic capacitor per datasheet recommendation |
| 4 CE | Active-high enable control | Logic high ≥1.5V enables regulator; internal 2.5–10MΩ pull-down ensures default OFF state |
| 5 NC | No connection | Not internally bonded; must remain unconnected and unpopulated on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µVrms (10Hz–100kHz) - preserves signal integrity in analog sensor interfaces and RF bias rails |
| High PSRR at 10kHz | 70dB - rejects ripple from switching regulators without additional filtering |
| Sub-1µA shutdown current | 0.1µA typical - eliminates quiescent drain during system sleep, critical for coin-cell applications |
| Ceramic capacitor compatibility | Stable with ≥1µF, 0.01–100Ω ESR ceramics - reduces BOM count and board area vs. tantalum alternatives |
| Precision output accuracy | ±2% over -40°C to +85°C - eliminates need for post-regulation trimming in industrial temperature ranges |
| Fast transient response | Load step recovery <200µs (100mA step) - maintains voltage within spec during processor core wake-up bursts |
Applications
| Portable Audio Codec Power | IoT Sensor Node Bias Rail |
|---|---|
|
Use Scenario: Powering stereo audio codec ICs in Bluetooth earbuds requiring clean 2.5V analog supply. IC Role / Device Role / Timing Role: Low-noise LDO providing dedicated analog VDD for DAC/ADC sections, decoupled from noisy digital domains. Use Value: 30µVrms noise prevents audible hiss; 70dB PSRR isolates codec from 2MHz DC/DC switching artifacts. |
Use Scenario: Supplying 2.5V to MEMS accelerometer and environmental sensor clusters in battery-operated asset trackers. IC Role / Device Role / Timing Role: Primary bias regulator enabling ultra-low-power sleep mode via CE-controlled shutdown. Use Value: 0.1µA standby current extends 10-year battery life; ±2% accuracy ensures calibrated sensor output without software compensation. |
| RF Front-End LNA Bias | Microcontroller Core Voltage |
|
Use Scenario: Delivering stable 2.5V to low-noise amplifier (LNA) in sub-GHz wireless transceivers. IC Role / Device Role / Timing Role: Ultra-low-noise local regulator isolating LNA from shared system rail noise. Use Value: 30µVrms noise preserves receiver sensitivity; fast load transient response maintains gain stability during packet transmission bursts. |
Use Scenario: Providing regulated 2.5V core supply to ARM Cortex-M0+ MCU in medical wearable devices. IC Role / Device Role / Timing Role: Main system LDO supporting both active and deep-sleep operating modes. Use Value: 150mV dropout enables operation down to 2.65V input, maximizing usable capacity from single-cell LiPo; CE pin synchronizes with MCU power states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-25W5-7 | Higher dropout (250mV @ 150mA), higher noise (45µVrms), no CE pin | Lacks enable control and has reduced noise performance; suitable only for non-critical, always-on rails | Select only if CE functionality and ultra-low noise are not required; verify thermal derating at full load |
| MCP1700T-2502E/MB | Lower max current (250mA), higher quiescent current (2.5µA), no internal CE pull-down | Requires external pull-down resistor for defined shutdown; less optimized for sub-1µA sleep systems | Prefer when higher output current is needed and standby current >0.1µA is acceptable |
Compared with AP7315-25W5-7 and MCP1700T-2502E/MB, the AP2122AK-2.5TRE1 uniquely combines sub-1µA shutdown, 30µVrms noise, and integrated CE pull-down-making it optimal for battery-constrained, noise-sensitive applications where deterministic power sequencing is essential.
Availability
AP2122AK-2.5TRE1 is available at Aetrix Electronics and suitable for portable audio systems, IoT sensor nodes, RF front-end biasing, and microcontroller core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP2122AK-2.5TRE1 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 communications markets.
The AP2122 series belongs to Diodes' high-speed, ultra-low-noise LDO product line, engineered specifically for battery-powered portable electronics where power efficiency, noise immunity, and compact footprint are critical design constraints.
FAQ
What is the minimum input voltage required for stable 2.5V output at 100mA load?
The AP2122AK-2.5TRE1 requires VIN ≥ 2.65V to maintain regulation at 100mA due to its 150mV typical dropout voltage. At lower input voltages, output drops linearly; operation below 2V is prohibited per absolute maximum ratings. Input must also stay within 2V–6V operating range.
Can the AP2122AK-2.5TRE1 be used with a 0.47µF output capacitor?
No. The datasheet specifies a minimum output capacitance of 1µF with ESR between 0.01Ω and 100Ω for stability. Using 0.47µF risks oscillation and poor transient response. Ceramic capacitors ≥1µF are mandatory; X5R/X7R dielectrics are recommended for temperature stability.
Is the NC pin (Pin 5) electrically isolated or should it be grounded?
Pin 5 is a true no-connect terminal - not internally bonded and electrically isolated. It must remain unconnected on the PCB; grounding or routing to any net may cause mechanical stress or unintended coupling. The SOT-23-5 package uses this pin position solely for mechanical symmetry.
How does the CE pin behave during power-up when VIN rises before CE is asserted?
The CE pin has an internal 2.5–10MΩ pull-down resistor, ensuring the regulator remains disabled until CE is actively driven ≥1.5V. During VIN ramp-up, the device stays in shutdown until CE is asserted, preventing uncontrolled output turn-on and inrush into downstream capacitance.
AP2122AK-2.5TRE1 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2122AK-2.5TRE1 FAQ
1.How can I place an order for AP2122AK-2.5TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-2.5TRE1 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 AP2122AK-2.5TRE1 reliable?
The price and inventory of AP2122AK-2.5TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-2.5TRE1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-2.5TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-2.5TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-2.5TRE1?
AP2122AK-2.5TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-2.5TRE1 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 AP2122AK-2.5TRE1?
For technical support, including AP2122AK-2.5TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-2.5TRE1 requirements.
6.How does Aetrix verify that AP2122AK-2.5TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-2.5TRE1 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 AP2122AK-2.5TRE1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-2.5TRE1?
All AP2122AK-2.5TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-2.5TRE1, 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 AP2122AK-2.5TRE1 part is unused and in its original packaging.
Return procedure for AP2122AK-2.5TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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