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Diodes Incorporated AP2121AK-3.3TRE1
- Part No.:
- AP2121AK-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:17,745
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Product details
Overview
AP2121AK-3.3TRE1 from Diodes Incorporated is a high-speed, extremely low-noise 3.3V fixed-output 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 and RF circuitry in portable battery-powered systems.
For engineers reviewing the AP2121AK-3.3TRE1 datasheet, AP2121AK-3.3TRE1 pinout, AP2121AK-3.3TRE1 application, or AP2121AK-3.3TRE1 equivalent, key selection criteria include ultra-low noise performance, compatibility with 1µF ceramic output capacitors, high PSRR (70dB @ 1kHz), low quiescent current (25µA typ), and automotive-grade qualification readiness via IATF 16949 manufacturing.
Technical Context
The AP2121AK-3.3TRE1 employs a CMOS-based error amplifier architecture with internal voltage reference and current-limit protection, enabling stable regulation under fast load transients. Its enable-controlled shutdown mode reduces standby current to 0.1µA while maintaining precise 3.3V output during active operation.
Designed for input voltages from 2V to 6V, it achieves excellent line regulation (4mV typ) and load regulation (12mV typ), with thermal resistance θJA of 250°C/W in SOT-23-3. The device operates across –40°C to +85°C ambient and supports ceramic capacitors down to 1µF with ESR 0.01Ω–100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures stable supply for 3.3V logic, ADC references, and RF ICs without external trimming. |
| Max Output Current | 200mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs on compact PCBs. |
| Dropout Voltage | 150mV typ @ 100mA - enables regulation from 3.45V input, extending battery runtime in single-cell Li-ion or dual-cell alkaline systems. |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and quantization noise in precision ADCs. |
| PSRR | 70dB @ 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 and low-power wake-up circuits. |
| Enable Threshold | VCE(HI) = 1.5V min - compatible with 1.8V/3.3V GPIO control without level-shifting. |
Pinout & Package
SOT-23-3 package: 3-pin surface-mount, JEDEC MO-178AA compliant, footprint-compatible with industry-standard SOT-23 footprints. Thermal pad not present; θJA = 250°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input voltage supply pin - accepts 2V to 6V; requires ≥1µF ceramic input capacitor for stability. |
| 2 | GND | Power ground reference - must be connected to low-impedance system ground plane to maintain noise performance. |
| 3 | VOUT | Regulated 3.3V output - drives load directly; requires ≥1µF ceramic output capacitor with ESR 0.01–100Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 30µVrms output noise enables clean power for RF front-ends and high-resolution ADCs without additional filtering. |
| Low dropout with high current capability | 150mV dropout at 100mA allows efficient operation from marginal input rails, reducing heat dissipation vs. higher-dropout alternatives. |
| Fast transient response | Excellent line and load transient response minimizes output voltage sag during CPU burst activity or sensor sampling events. |
| 1µF ceramic capacitor compatibility | Stable with small-footprint 1µF X5R/X7R ceramics - eliminates need for larger, costlier tantalum or electrolytic capacitors. |
| Enable-controlled shutdown | 0.1µA standby current and logic-level CE input simplify power sequencing in multi-rail embedded systems. |
Applications
| Mobile Wireless Audio | Industrial Sensor Node |
|---|---|
Use Scenario: Powering MEMS microphones and audio codecs in Bluetooth headsets. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for analog signal chain and clock-sensitive DACs. Use Value: 30µVrms noise prevents audible hiss; 25µA quiescent current extends talk time between charges. |
Use Scenario: Local regulation for 16-bit temperature/humidity sensors and LoRaWAN transceivers. IC Role / Device Role / Timing Role: Precision bias rail ensuring sensor offset stability and RF transmit spectral purity. Use Value: ±2% output accuracy maintains measurement linearity; 70dB PSRR rejects switcher noise from shared power domain. |
| Medical Wearable Display | Automotive Cabin Camera Module |
Use Scenario: Supplying OLED display drivers and touch controller ASICs in fitness trackers. IC Role / Device Role / Timing Role: Stable 3.3V rail decoupling digital logic and analog pixel drivers. Use Value: Fast load transient response prevents display flicker during UI refresh; SOT-23-3 saves board space. |
Use Scenario: Powering image signal processor (ISP) and MIPI CSI-2 serializer in rear-view cameras. IC Role / Device Role / Timing Role: Clean 3.3V domain for timing-critical video data paths and PLLs. Use Value: 150mV dropout enables direct connection to 3.7V Li-ion battery; AEC-Q100-ready manufacturing supports automotive qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-33WG-7 | Successor device: same 3.3V output, 300mA rating, 120mV dropout, 25µVrms noise, and improved PSRR (75dB @ 1kHz). | Pin-compatible SOT-23-3 drop-in replacement with enhanced thermal performance (θJA = 220°C/W) and extended -40°C to +125°C operation. | Preferred for new designs requiring longer product lifecycle support and tighter thermal margins. |
| MCP1700T-3302E/MB | Microchip part: 3.3V, 250mA, 175mV dropout, 30µVrms noise, but higher quiescent current (3.5µA typ) and no enable pin. | Lacks CE control and has lower PSRR (60dB @ 1kHz); suitable only where shutdown functionality is unnecessary. | Consider only if enable function is unused and AP7343 is unavailable; verify thermal derating at full load. |
Compared with AP2121AK-3.3TRE1, AP7343-33WG-7 offers lower noise, better PSRR, and extended temperature range-making it ideal for next-gen designs-while MCP1700T-3302E/MB trades enable control and PSRR for broader distributor availability in legacy systems.
Availability
AP2121AK-3.3TRE1 is available at Aetrix Electronics and suitable for mobile wireless audio, industrial sensor nodes, medical wearable displays, and automotive cabin camera modules requiring stable component supply and long-term sourcing continuity.
Supply support for AP2121AK-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and test facilities certified to IATF 16949 and ISO 9001 standards.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications where ultra-low noise, low dropout, and minimal quiescent current are critical.
FAQ
What is the recommended input and output capacitance for AP2121AK-3.3TRE1?
The AP2121AK-3.3TRE1 requires a minimum 1µF ceramic capacitor at the input and ≥1µF ceramic capacitor at the output, with ESR between 0.01Ω and 100Ω. X5R or X7R dielectrics are recommended; no external compensation is needed. Larger values improve transient response but do not affect stability.
Does AP2121AK-3.3TRE1 support automotive qualification?
AP2121AK-3.3TRE1 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q100, Diodes offers automotive-grade variants (e.g., AP2121AK-3.3TRE1G) with full stress testing-contact Diodes or Aetrix for qualified part numbers and test reports.
Can AP2121AK-3.3TRE1 be used with a 1.8V enable signal?
Yes. The CE pin has a guaranteed logic-high threshold of 1.5V minimum, making it fully compatible with 1.8V GPIO outputs. With 0.25V maximum logic-low threshold, it reliably shuts down when driven by standard 3.3V or 1.8V microcontroller pins without external level shifters.
Why is AP2121AK-3.3TRE1 not recommended for new designs?
Diodes has designated AP2121AK-3.3TRE1 as "not recommended for new designs" due to the introduction of the improved AP7343 series, which offers lower noise (25µVrms), higher PSRR (75dB), and extended temperature range (–40°C to +125°C). Legacy designs may continue using AP2121AK-3.3TRE1 with full parametric and form-fit compatibility.
AP2121AK-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):
- 0.5V @ 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-3.3TRE1 FAQ
1.How can I place an order for AP2121AK-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-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 AP2121AK-3.3TRE1 reliable?
The price and inventory of AP2121AK-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 AP2121AK-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-3.3TRE1?
AP2121AK-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-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 AP2121AK-3.3TRE1?
For technical support, including AP2121AK-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-3.3TRE1 requirements.
6.How does Aetrix verify that AP2121AK-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-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 AP2121AK-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-3.3TRE1?
All AP2121AK-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-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 AP2121AK-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2121AK-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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