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Diodes Incorporated AP2121AK-3.0TRG1
- Part No.:
- AP2121AK-3.0TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-3.0TRG1.pdf
- Description:
- IC REG LINEAR 3V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
AP2121AK-3.0TRG1 from Diodes Incorporated is a 3.0V fixed-output, high-speed, ultra-low-noise CMOS LDO regulator in SOT-23-5 package, delivering up to 200mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy over -40°C to +85°C. It serves as a precision local power supply for RF front-ends and analog sensor circuits in portable battery-powered systems.
For engineers reviewing the AP2121AK-3.0TRG1 datasheet, AP2121AK-3.0TRG1 pinout, AP2121AK-3.0TRG1 application, or AP2121AK-3.0TRG1 equivalent, key selection criteria include its 70dB PSRR at 1kHz, 25µA quiescent current, CE-enabled shutdown mode, compatibility with 1µF ceramic output capacitors, and thermal performance in SOT-23-5 (θJA = 250°C/W).
Technical Context
The AP2121AK-3.0TRG1 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit protection circuit. Its architecture enables fast load transient response and stable regulation under low-ESR ceramic capacitor conditions (1µF minimum, 0.01Ω–100Ω ESR).
It operates across 2V to 6V input range with 3.0V regulated output, supports active-high enable control (CE), and features internal thermal shutdown. The device is not recommended for new designs; Diodes recommends AP7343 as a functional upgrade path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±2% - ensures stable biasing for 3.0V logic and analog ICs without external trimming |
| Max Output Current | 200mA - sufficient for powering single-core microcontrollers or RF transceivers |
| Dropout Voltage | 150mV typ. @ 100mA - enables operation from 3.15V input when battery voltage drops near end-of-life |
| PSRR | 70dB typ. @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO |
| Output Noise | 30µVrms (10Hz–100kHz) - preserves signal integrity in ADC reference or PLL VCO supply rails |
| Quiescent Current | 25µA typ. - extends battery life in always-on sensor nodes with periodic wake-up |
| Enable Threshold | CE "High" ≥1.5V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 package: 5-pin surface-mount plastic package with exposed pad (thermal enhancement), footprint compatible with JEDEC MO-178AB, θJA = 250°C/W, θJC = 74°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Chip Enable | Active-high digital control input; pulls down internally via 2.5–10MΩ resistor when unconnected |
| 2 (VIN) | Input Supply | Accepts 2V–6V input; requires ≥1µF ceramic decoupling capacitor |
| 3 (GND) | Ground Reference | Common return path for input, output, and internal circuitry; must be low-impedance |
| 4 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practice |
| 5 (VOUT) | Regulated Output | Delivers 3.0V ±2%; requires ≥1µF ceramic output capacitor (ESR 0.01–100Ω) for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 30µVrms output noise enables clean power for RF receivers and precision ADCs |
| High PSRR at audio frequencies | 70dB rejection at 1kHz mitigates ripple from buck converter switching artifacts |
| Low-quiescent-current shutdown | 0.1µA standby current minimizes leakage during system sleep modes |
| Fast transient response | Stable under rapid 10–90% load steps without external compensation |
| Ceramic capacitor compatibility | Supports 1µF output capacitance - reduces board area vs. tantalum alternatives |
Applications
| Mobile RF Front-End Power | Portable Audio Codec Supply |
|---|---|
Use Scenario: Powering LTE/5G PA driver stages and LNA bias networks in smartphones. IC Role / Device Role / Timing Role: Low-noise local LDO supplying critical analog blocks adjacent to noisy digital baseband ICs. Use Value: 30µVrms noise prevents reciprocal mixing degradation in receiver sensitivity. | Use Scenario: Providing clean 3.0V bias to stereo audio DACs and headphone amplifiers in wireless earbuds. IC Role / Device Role / Timing Role: Dedicated post-regulator isolating codec from shared PMIC rail noise. Use Value: 70dB PSRR eliminates audible switching tones from DC/DC converters operating at ~2MHz. |
| Industrial Sensor Node Core Supply | Medical Wearable Analog Front-End |
Use Scenario: Regulating power for ultra-low-power Cortex-M0+ MCU and 16-bit SAR ADC in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Primary 3.0V domain regulator enabling <100µA sleep current and fast wake-up response. Use Value: 25µA quiescent current and 0.1µA shutdown extend 2xAA battery life beyond 2 years. | Use Scenario: Supplying EEG/ECG analog signal conditioning circuitry requiring sub-50µV noise floor. IC Role / Device Role / Timing Role: Precision low-noise LDO for op-amp bias and reference buffer stages. Use Value: ±2% output accuracy and ±300µV/°C tempco ensure consistent gain calibration across body temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-30YG-13 | Same 3.0V output, 300mA rating, lower 120mV dropout, 20µA IQ, AEC-Q100 qualified | Automotive-grade replacement with enhanced thermal performance (θJA = 190°C/W) | Select for new designs requiring automotive qualification or higher current headroom |
| MCP1700-3002E/TO | 3.0V output, 250mA, 175mV dropout, 1.8µA IQ, TO-92 package | Through-hole alternative with ultra-low quiescent current but no enable pin | Select only for legacy through-hole assembly or ultra-deep-sleep applications where CE is unnecessary |
Compared with AP2121AK-3.0TRG1, AP7343-30YG-13 offers higher reliability for automotive use and better efficiency at light loads, while MCP1700-3002E/TO trades off enable functionality and SMT compatibility for extreme low-power operation in non-portable equipment.
Availability
AP2121AK-3.0TRG1 is available at Aetrix Electronics and suitable for mobile RF front-end power, portable audio codec supply, and industrial sensor node core supply requiring stable component supply and long-term inventory continuity.
Supply support for AP2121AK-3.0TRG1 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AP2121 series belongs to Diodes' high-performance LDO portfolio targeting battery-powered portable electronics, emphasizing ultra-low noise, fast transient response, and minimal external component count.
FAQ
What is the minimum input voltage required for stable 3.0V output at 200mA load?
The AP2121AK-3.0TRG1 requires VIN ≥ VOUT + VDROP. At 200mA, typical dropout is 250mV (max 500mV), so minimum input is 3.25V (typical) or 3.5V (worst-case) to maintain regulation. Below that, output voltage sags linearly with input.
Can the NC pin (Pin 4) be connected to ground or left floating?
Pin 4 is internally unconnected and must remain floating per datasheet guidance. Grounding it may cause unpredictable behavior or increased leakage; Diodes specifies no external connection. Layout should avoid solder mask bridging or routing traces to this pad.
Is AP2121AK-3.0TRG1 qualified for automotive applications?
No - AP2121AK-3.0TRG1 is not AEC-Q100 qualified. Diodes explicitly states that automotive-grade versions require separate qualification (e.g., PPAP, IATF 16949 manufacturing), and recommends contacting their automotive team for qualified alternatives like AP7343.
Why does the datasheet state "not recommended for new designs"?
Diodes has superseded AP2121AK-3.0TRG1 with AP7343, which offers improved specs (lower dropout, higher current, AEC-Q100 option) and ongoing process support. While AP2121AK-3.0TRG1 remains in production for legacy programs, Diodes advises new designs adopt AP7343 for long-term supply assurance and performance gains.
AP2121AK-3.0TRG1 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-3.0TRG1 FAQ
1.How can I place an order for AP2121AK-3.0TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-3.0TRG1 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-3.0TRG1 reliable?
The price and inventory of AP2121AK-3.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-3.0TRG1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-3.0TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-3.0TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-3.0TRG1?
AP2121AK-3.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-3.0TRG1 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-3.0TRG1?
For technical support, including AP2121AK-3.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-3.0TRG1 requirements.
6.How does Aetrix verify that AP2121AK-3.0TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-3.0TRG1 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-3.0TRG1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-3.0TRG1?
All AP2121AK-3.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-3.0TRG1, 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-3.0TRG1 part is unused and in its original packaging.
Return procedure for AP2121AK-3.0TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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