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Diodes Incorporated AP2121AK-3.0TRE1
- Part No.:
- AP2121AK-3.0TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-3.0TRE1.pdf
- Description:
- IC REG LINEAR 3V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
AP2121AK-3.0TRE1 from Diodes Incorporated is a 3.0V fixed-output, high-speed, ultra-low-noise CMOS LDO regulator in SOT-23-3 package, delivering up to 200mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy. It serves as a precision local power rail for noise-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2121AK-3.0TRE1 datasheet, AP2121AK-3.0TRE1 pinout, AP2121AK-3.0TRE1 application, or AP2121AK-3.0TRE1 equivalent, key selection criteria include dropout performance under 100mA load, RMS noise floor in audio/RF bias rails, standby current below 1µA, compatibility with 1µF ceramic output capacitors, and thermal resistance in SOT-23-3 packaging.
Technical Context
The AP2121AK-3.0TRE1 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit protection-no external feedback resistors required due to fixed 3.0V output. Its internal architecture enables fast load transient response and stable operation with low-ESR ceramic capacitors ≥1µF.
It operates across 2V to 6V input range, supports –40°C to +85°C ambient, and features active-high enable control (CE) with 1.5V logic-high threshold and 0.25V logic-low threshold-though CE is unconnected in the SOT-23-3 variant per pinout documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±2% - ensures stable bias for 3.0V-tolerant ADCs, sensors, and RF front-end ICs |
| Max Output Current | 200mA continuous - sufficient for powering single-core microcontrollers or small FPGA I/O banks |
| Dropout Voltage | 150mV typical at 100mA - enables regulation from 3.15V input, critical for Li-ion single-cell systems |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - meets stringent requirements for PLL VCO supplies and audio codec references |
| PSRR | 70dB typical at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Quiescent Current | 25µA typical - extends battery life in always-on sensor nodes and wearable standby modes |
| Standby Current | 0.1µA typical - enables nano-power shutdown when CE is asserted (not applicable in SOT-23-3 variant) |
| Line Regulation | 4mV typical - maintains output stability despite ±0.5V input variation from battery discharge |
Pinout & Package
SOT-23-3 package: 3-pin surface-mount, JEDEC standard footprint, 1.3mm × 2.9mm body, 0.95mm height, 250°C/W junction-to-ambient thermal resistance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 2V–6V; requires ≥1µF ceramic input capacitor |
| 2 | GND | Analog ground reference; must be low-impedance connection to system ground plane |
| 3 | VOUT | Regulated 3.0V output; requires ≥1µF ceramic output capacitor with ESR 0.01Ω–100Ω |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µVrms enables direct use in RF synthesizer VCO and high-resolution SAR ADC reference rails |
| Low dropout at full load | 150mV @ 100mA allows >95% efficiency in 3.3V-to-3.0V conversion from partially discharged Li-ion cells |
| Ceramic capacitor compatible | Stable with ≥1µF X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic capacitors |
| High PSRR at audio frequencies | 70dB @ 1kHz rejects ripple from buck converter switching artifacts before they couple into analog stages |
| Precision output accuracy | ±2% over temperature and line/load ensures reliable operation of 3.0V logic without margining overhead |
Applications
| Mobile Audio Codec Power | Wireless Sensor Node Core Rail |
|---|---|
Use Scenario: Powers DAC, ADC, and analog front-end in Bluetooth headset audio subsystem. IC Role / Device Role / Timing Role: Low-noise local LDO supplying clean 3.0V to audio signal chain components. Use Value: 30µVrms noise prevents audible hiss; 150mV dropout preserves runtime during battery sag. |
Use Scenario: Supplies MCU, BLE radio, and environmental sensor in coin-cell–powered IoT node. IC Role / Device Role / Timing Role: Primary regulated rail enabling sub-100µA sleep current and fast wake-up. Use Value: 0.1µA standby current extends 10-year battery life; 25µA quiescent current minimizes idle drain. |
| Camera Module Bias Supply | Industrial PLC I/O Isolation Rail |
Use Scenario: Provides stable 3.0V to image sensor analog block and ISP core in compact camera module. IC Role / Device Role / Timing Role: Precision LDO decoupling digital switching noise from sensitive pixel readout circuitry. Use Value: ±2% output accuracy ensures consistent ADC reference; 70dB PSRR blocks digital coupling. |
Use Scenario: Generates isolated 3.0V rail for optocoupler input side and level-shifting logic in 24V industrial PLC. IC Role / Device Role / Timing Role: Local post-regulator after wide-input DC/DC, ensuring noise-free interface signaling. Use Value: 4mV line regulation maintains signal integrity across 20–30V input transients; SOT-23-3 eases layout in dense I/O modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-30SAG-7 | Successor LDO: same 3.0V output, 300mA rating, 250mV dropout @ 200mA, 20µVrms noise, SOT-23-3 | Lower noise and higher current support; designed for new designs where AP2121 is obsolete | Select for new designs requiring extended lifetime availability and improved noise performance |
| MCP1700T-3002E/MB | Microchip LDO: 3.0V, 250mA, 175mV dropout @ 250mA, 30µVrms, SOT-23-3, 1.6µA quiescent current | Higher IQ than AP2121 but AEC-Q100 qualified; lacks CE pin in 3-pin version | Prefer for automotive-qualified applications where 1.6µA IQ is acceptable and qualification is mandatory |
Compared with AP2121AK-3.0TRE1, AP7343-30SAG-7 offers lower noise and longer product lifecycle, while MCP1700T-3002E/MB trades slightly higher quiescent current for AEC-Q100 compliance-making it suitable only where automotive qualification outweighs ultra-low-IQ requirements.
Availability
AP2121AK-3.0TRE1 is available at Aetrix Electronics and suitable for mobile audio subsystems, wireless sensor nodes, camera module biasing, and industrial I/O isolation circuits requiring stable component supply and known legacy LDO behavior.
Supply support for AP2121AK-3.0TRE1 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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and minimal quiescent current.
FAQ
Is AP2121AK-3.0TRE1 recommended for new designs?
No. Diodes Incorporated explicitly states "THE AP2121 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7343." The AP2121AK-3.0TRE1 remains available for legacy production and repair, but AP7343-30SAG-7 is the designated functional successor with improved specs and long-term supply assurance.
What is the minimum output capacitance required for stability?
The AP2121AK-3.0TRE1 requires ≥1µF ceramic output capacitance with ESR between 0.01Ω and 100Ω. X5R or X7R dielectrics are recommended. Using less than 1µF risks instability and excessive output ripple, especially under dynamic load conditions.
Does AP2121AK-3.0TRE1 have an enable (CE) pin?
No. The SOT-23-3 variant (AP2121AK-3.0TRE1) has no CE pin-it is permanently enabled. CE functionality is only present in the 5-pin SOT-23-5 and CSP-4 versions. Pin 1 is VIN, Pin 2 is GND, Pin 3 is VOUT.
Can AP2121AK-3.0TRE1 be used with input voltages below 2.0V?
No. The absolute minimum input voltage is 2.0V per Recommended Operating Conditions. Operation below 2.0V violates specification and may cause output regulation failure, increased dropout, or undefined behavior-even if the device appears to function intermittently.
AP2121AK-3.0TRE1 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):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- 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
AP2121AK-3.0TRE1 FAQ
1.How can I place an order for AP2121AK-3.0TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-3.0TRE1 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 AP2121AK-3.0TRE1 reliable?
The price and inventory of AP2121AK-3.0TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-3.0TRE1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-3.0TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-3.0TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-3.0TRE1?
AP2121AK-3.0TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-3.0TRE1 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 AP2121AK-3.0TRE1?
For technical support, including AP2121AK-3.0TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-3.0TRE1 requirements.
6.How does Aetrix verify that AP2121AK-3.0TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-3.0TRE1 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 AP2121AK-3.0TRE1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-3.0TRE1?
All AP2121AK-3.0TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-3.0TRE1, 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 AP2121AK-3.0TRE1 part is unused and in its original packaging.
Return procedure for AP2121AK-3.0TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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