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Diodes Incorporated AP2121N-3.3TRE1
- Part No.:
- AP2121N-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2121N-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 200MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
AP2121N-3.3TRE1 from Diodes Incorporated is a high-speed, extremely low-noise 3.3V 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 active-high enable control, current-limit protection, and supports ceramic output capacitors as low as 1µF - deployed in RF-sensitive subsystems of portable wireless devices.
For engineers reviewing the AP2121N-3.3TRE1 datasheet, AP2121N-3.3TRE1 pinout, AP2121N-3.3TRE1 application, or AP2121N-3.3TRE1 equivalent, key selection criteria include dropout performance under 100mA load, PSRR >70dB at 1kHz, standby current <1µA, thermal resistance (θJA = 250°C/W), and compatibility with 1µF ceramic output capacitance for stability.
Technical Context
The AP2121N-3.3TRE1 employs a CMOS-based error amplifier with internal voltage reference and resistor network to regulate output precisely at 3.3V across input voltages from 3.8V to 6V. Its architecture enables fast line and load transient response without external compensation.
It features an active-high chip-enable (CE) input with 1.5V logic-high threshold and 0.25V logic-low threshold, integrated short-circuit current limit (50mA), and thermal shutdown. The device operates over –40°C to +85°C ambient and supports AEC-Q200-compliant manufacturing when specified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures stable power for 3.3V logic rails including MCU I/O, RF transceivers, and sensor interfaces. |
| Max Output Current | 200mA continuous - sufficient for powering baseband processors, PMIC sub-regulators, or multi-sensor nodes. |
| Dropout Voltage | 150mV typical at 100mA - enables operation from single-cell Li-ion (3.4V min) or dual-cell alkaline inputs. |
| PSRR | 70dB typical at 1kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry. |
| Output Noise | 30µVrms (10Hz–100kHz) - meets low-noise requirements for ADC references, RF VCO supplies, and audio codecs. |
| Quiescent Current | 25µA typical - extends battery life in always-on monitoring circuits and IoT endpoint sleep modes. |
| Standby Current | 0.1µA typical - enables ultra-low-power shutdown states in portable equipment with CE-controlled sequencing. |
| Input Voltage Range | 2V to 6V - accommodates wide-input battery and adapter sources while maintaining regulation down to 3.8V for 3.3V output. |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, surface-mount, RoHS-compliant, rated for 250°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Chip Enable | Active-high digital control input; pulls down internally via 5MΩ resistor; enables full regulation when ≥1.5V. |
| 2 (GND) | Ground Reference | Power and signal return path; must be low-impedance connection to minimize noise coupling into error amplifier. |
| 3 (VIN) | Input Supply | Unregulated input (2–6V); requires ≥1µF ceramic decoupling capacitor placed adjacent to pin. |
| 4 (NC) | No Connection | Internally unconnected; must remain floating - no routing or soldering permitted. |
| 5 (VOUT) | Regulated Output | Stable 3.3V output; requires ≥1µF ceramic capacitor (ESR 0.01–100Ω) for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVrms output noise enables direct supply to precision analog blocks without additional filtering. |
| Ultra-low quiescent current | 25µA typical IQ allows use in energy-harvesting and coin-cell-powered applications with multi-year runtime. |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic capacitors. |
| High PSRR at audio frequencies | 70dB rejection at 1kHz suppresses ripple from buck converter switching artifacts near sensitive receivers. |
| Precision output accuracy | ±2% tolerance over temperature and load ensures reliable interface timing margins for 3.3V digital ICs. |
| Fast transient response | Excellent line/load transient behavior minimizes undershoot/overshoot during burst-mode processor activity. |
Applications
| Wireless Baseband Power | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powers baseband processor and RF front-end ICs in Bluetooth LE headsets and Wi-Fi modules. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying core logic and analog PHY sections with low-noise, fast-transient capability. Use Value: 30µVrms noise prevents degradation of receiver sensitivity; 150mV dropout enables efficient use of partially discharged batteries. |
Use Scenario: Supplies ADC, op-amps, and BLE SoC in wearable ECG and pulse oximetry patches. IC Role / Device Role / Timing Role: Precision analog rail generator with tight voltage tolerance and minimal thermal drift. Use Value: ±2% output accuracy maintains ADC reference integrity; 0.1µA standby current extends single-charge battery life beyond 30 days. |
| Industrial Handheld Terminals | Smart Camera Modules |
|
Use Scenario: Provides regulated 3.3V to barcode scanner ASICs, display drivers, and secure element ICs. IC Role / Device Role / Timing Role: Main system LDO with enable control for power sequencing and firmware-triggered shutdown. Use Value: Active-high CE simplifies GPIO-driven power management; 200mA output supports simultaneous scan + display + comms operation. |
Use Scenario: Delivers clean 3.3V to image sensor interface, ISP, and embedded flash controller in compact IP cameras. IC Role / Device Role / Timing Role: Low-noise auxiliary regulator isolating noisy digital domains from analog pixel readout paths. Use Value: 70dB PSRR attenuates switching noise from nearby DC/DC converters, reducing image sensor pattern noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-33SAG-7 | Successor part; same SOT-23-5 package, 300mA output, 120mV dropout at 100mA, 25µVrms noise. | Higher current capability and lower dropout support next-gen higher-power sensors and connectivity ICs. | Select for new designs requiring extended lifetime support and improved thermal performance (θJA = 220°C/W). |
| MCP1700-3302E/TO | Microchip 3.3V LDO in SOT-23-3; 250mA output, 178mV dropout at 250mA, 30µVrms noise, no CE pin. | Lacks enable control and uses 3-pin package - suitable only where sequencing is handled externally or not required. | Choose only if board space is constrained and CE functionality is unnecessary; verify thermal derating at 200mA. |
Compared with AP2121N-3.3TRE1, AP7343-33SAG-7 offers higher current and lower dropout for future-proofing, while MCP1700-3302E/TO trades enable functionality for smaller footprint - both require revalidation of transient response and noise performance in target layout.
Availability
AP2121N-3.3TRE1 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld terminals, smart camera modules, and wireless baseband subsystems requiring stable component supply with known lifecycle status.
Supply support for AP2121N-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 for power management, signal integrity, and connectivity applications.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered for battery-powered and noise-sensitive systems where precision regulation, ultra-low IQ, and fast transient response are critical.
FAQ
What is the minimum input voltage required for AP2121N-3.3TRE1 to maintain regulation?
The AP2121N-3.3TRE1 requires VIN ≥ 3.8V to sustain 3.3V output under full 200mA load, based on its 250mV max dropout at that current. At 100mA, 3.45V input suffices due to 150mV typical dropout. Operation below 3.8V is valid only at reduced load or elevated temperature, per the Electrical Characteristics table on page 13 of DS46506 Rev. 3–3.
Can AP2121N-3.3TRE1 be used with a 0.47µF output capacitor?
No - the datasheet mandates ≥1µF ceramic output capacitance (X5R/X7R, ESR 0.01–100Ω) for guaranteed stability and transient performance. Using 0.47µF risks oscillation, excessive overshoot, or failure to recover from load steps, as confirmed by stability testing in Figure 12 and Note 1 of the Typical Applications Circuit section.
Is the NC pin (Pin 4) safe to connect to ground or leave unconnected?
Pin 4 is internally unconnected and must remain floating - neither grounded nor tied to any net. Connecting it may cause unpredictable behavior or damage, as stated in the Pin Descriptions table (page 3) and Absolute Maximum Ratings (page 3). PCB layout must omit solder mask and trace routing at this pad.
Does AP2121N-3.3TRE1 meet AEC-Q200 for automotive use?
The standard AP2121N-3.3TRE1 is not AEC-Q200 qualified. However, Diodes offers automotive-grade variants (e.g., AP2121NQ-3.3TRE1) manufactured in IATF 16949-certified facilities, PPAP-capable, and qualified to AEC-Q100/200. These require explicit part number suffixes and are subject to change control - contact Diodes or Aetrix for qualification documentation.
AP2121N-3.3TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2121N-3.3TRE1 FAQ
1.How can I place an order for AP2121N-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121N-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 AP2121N-3.3TRE1 reliable?
The price and inventory of AP2121N-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 AP2121N-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2121N-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121N-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121N-3.3TRE1?
AP2121N-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121N-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 AP2121N-3.3TRE1?
For technical support, including AP2121N-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121N-3.3TRE1 requirements.
6.How does Aetrix verify that AP2121N-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2121N-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 AP2121N-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2121N-3.3TRE1?
All AP2121N-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121N-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 AP2121N-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2121N-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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