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Diodes Incorporated AP2121AK-2.5TRG1
- Part No.:
- AP2121AK-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,438
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Product details
Overview
AP2121AK-2.5TRG1 from Diodes Incorporated is a high-speed, extremely low-noise 2.5V fixed-output 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. It integrates an active-high enable pin, supports ceramic capacitors as low as 1µF, and targets precision power rails in battery-powered imaging and communication subsystems.
For engineers reviewing the AP2121AK-2.5TRG1 datasheet, AP2121AK-2.5TRG1 pinout, AP2121AK-2.5TRG1 application, or AP2121AK-2.5TRG1 equivalent, key selection criteria include dropout behavior under 200mA load, 70dB PSRR at 1kHz, standby current of 0.1µA, thermal resistance (θJA = 250°C/W), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The AP2121AK-2.5TRG1 employs a CMOS-based error amplifier architecture with internal voltage reference and resistor network for precise 2.5V regulation. Its current-limit circuit provides short-circuit protection up to 50mA, while the chip-enable function allows logic-controlled shutdown with 0.1µA standby current.
Designed for stability with 1µF ceramic input/output capacitors, it achieves excellent transient response-both line and load-with output voltage deviation limited to 4mV (line regulation) and 12mV (load regulation) across operating conditions. The device operates over -40°C to +85°C ambient temperature with input voltage range 2V to 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V ±2% - ensures stable rail for 2.5V logic or analog circuitry without external feedback |
| Max Output Current | 200mA continuous - sufficient for powering microcontroller cores, sensors, or RF front-end biasing |
| Dropout Voltage | 150mV typ. @ 100mA - enables operation from 2.65V input when regulating 2.5V, critical for single-cell Li-ion systems |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - minimizes jitter and signal corruption in ADC reference or PLL supply paths |
| PSRR | 70dB typ. @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Quiescent Current | 25µA typ. - preserves battery life in always-on sensor nodes or standby modes |
| Enable Threshold | VCE(HI) ≥ 1.5V, VCE(LO) ≤ 0.25V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 package: 5-pin surface-mount plastic package with standard footprint, θJA = 250°C/W, rated for 150°C junction temperature and 260°C soldering peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Active-high enable input - drives LDO into 0.1µA shutdown mode when pulled low |
| 2 | VIN | Input voltage supply - accepts 2V to 6V, requires ≥1µF ceramic input capacitor |
| 3 | GND | Ground reference - must be low-impedance connection to minimize noise coupling |
| 4 | NC | No connection - internally unconnected; leave floating or grounded per layout best practice |
| 5 | VOUT | Regulated 2.5V output - requires ≥1µF ceramic output capacitor with ESR 0.01Ω–100Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVrms output noise enables clean power for high-resolution ADCs and RF synthesizers |
| Ultra-low quiescent current | 25µA typical IQ extends runtime in coin-cell or energy-harvesting applications |
| High PSRR at audio frequencies | 70dB rejection at 1kHz mitigates ripple from buck converter switching artifacts |
| Fast load transient response | Minimal voltage dip/surge during 10–90% load steps supports real-time signal processing loads |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics eliminates need for costly tantalum or electrolytic caps |
Applications
| Mobile Imaging Power | Wireless Sensor Node Core Supply |
|---|---|
Use Scenario: Powers image signal processor (ISP) and CMOS image sensor analog rails in compact smartphones and action cameras. IC Role / Device Role / Timing Role: Provides ultra-low-noise 2.5V bias for sensor analog front-end and ISP reference voltage. Use Value: 30µVrms noise prevents fixed-pattern noise and SNR degradation in raw image data. |
Use Scenario: Supplies MCU core, BLE radio, and environmental sensors in battery-operated industrial IoT nodes. IC Role / Device Role / Timing Role: Delivers regulated 2.5V to mixed-signal SoC with dynamic enable control for duty-cycled operation. Use Value: 0.1µA standby current and 25µA quiescent current maximize multi-year battery life in sleep-active cycles. |
| Sub-board Telecom Bias | Portable Audio Codec Supply |
Use Scenario: Generates clean 2.5V rail for FPGA I/O banks or SerDes termination on telecom daughter cards. IC Role / Device Role / Timing Role: Acts as local point-of-load regulator decoupling main 3.3V/5V backplane supply. Use Value: 70dB PSRR isolates sensitive high-speed interfaces from shared power rail noise. |
Use Scenario: Powers stereo audio codec's DAC/ADC analog section in portable media players and headsets. IC Role / Device Role / Timing Role: Supplies low-noise 2.5V reference and bias to audio conversion circuitry. Use Value: Sub-30µVrms noise floor prevents audible hiss and preserves THD+N performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-25SAG-7 | Successor LDO with same 2.5V output, lower 120mV dropout at 150mA, 20µA IQ, and AEC-Q100 qualification option | Supports automotive-grade designs requiring PPAP and IATF 16949 traceability; identical SOT-23-5 pinout | Select for new designs requiring extended lifecycle support and enhanced automotive compliance |
| MCP1700-2502E/TO | 2.5V LDO in TO-92; 6µA IQ, but only 250mA max output, no enable pin, higher 220mV dropout at 100mA | Lacks CE functionality and noise performance (45µVrms); suited for cost-sensitive, non-portable applications | Consider only if enable control and ultra-low noise are not required, and through-hole assembly is preferred |
Compared with AP2121AK-2.5TRG1, AP7343-25SAG-7 offers improved efficiency and automotive readiness, while MCP1700-2502E/TO trades noise and controllability for ultra-low quiescent current and legacy packaging-making AP2121AK-2.5TRG1 optimal for existing space-constrained, noise-sensitive portable designs where pin-compatible upgrade is not mandatory.
Availability
AP2121AK-2.5TRG1 is available at Aetrix Electronics and suitable for mobile imaging power, wireless sensor node core supply, sub-board telecom bias, and portable audio codec supply requiring stable component supply across production lifecycles.
Supply support for AP2121AK-2.5TRG1 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 ICs, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q standards.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, fast transient response, and minimal quiescent current.
FAQ
What is the minimum input voltage required for AP2121AK-2.5TRG1 to maintain regulation at full 200mA load?
The AP2121AK-2.5TRG1 maintains 2.5V output regulation down to VIN = VOUT + VDROP. At 200mA, typical dropout is 250mV (max 500mV per datasheet), so minimum input is 2.75V (typical) or 3.0V (worst-case). Operation below 2.75V risks output droop or dropout under load.
Can AP2121AK-2.5TRG1 be used with a 0.47µF output capacitor?
No. The datasheet specifies a minimum 1µF ceramic output capacitor for stability across all operating conditions. Using 0.47µF risks oscillation or poor transient response due to insufficient phase margin, especially with ESR outside the 0.01Ω–100Ω range.
Is the NC pin (Pin 4) required to be grounded or left floating?
Pin 4 is internally unconnected. Diodes recommends leaving it floating per datasheet guidance; grounding is permissible but unnecessary and may introduce unintended parasitic paths in high-frequency layouts.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
Diodes has designated AP2121AK-2.5TRG1 as mature-its successor AP7343 offers lower dropout, reduced quiescent current, and optional AEC-Q100 qualification. However, AP2121AK-2.5TRG1 remains fully supported for existing designs and legacy production with no imminent obsolescence.
AP2121AK-2.5TRG1 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):
- 0.5V @ 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-2.5TRG1 FAQ
1.How can I place an order for AP2121AK-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-2.5TRG1 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-2.5TRG1 reliable?
The price and inventory of AP2121AK-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-2.5TRG1?
AP2121AK-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-2.5TRG1 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-2.5TRG1?
For technical support, including AP2121AK-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-2.5TRG1 requirements.
6.How does Aetrix verify that AP2121AK-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-2.5TRG1 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-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-2.5TRG1?
All AP2121AK-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-2.5TRG1, 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-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2121AK-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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