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Diodes Incorporated AP2122AK-3.3TRG1
- Part No.:
- AP2122AK-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,492
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Product details
Overview
AP2122AK-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator IC in SOT-23-5 package, featuring 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy over -40°C to +85°C. It delivers up to 150mA continuous output current with active-high enable control and supports ceramic capacitors as low as 1µF for stability-ideal for powering RF sections and precision analog circuitry in portable devices.
For engineers reviewing the AP2122AK-3.3TRG1 datasheet, AP2122AK-3.3TRG1 pinout, AP2122AK-3.3TRG1 application, or AP2122AK-3.3TRG1 equivalent, key selection criteria include ultra-low noise performance, high PSRR (70dB @ 10kHz), tight load/line regulation (12mV/4mV typ), and guaranteed operation down to 2V input voltage with shutdown current of 0.1µA.
Technical Context
The AP2122AK-3.3TRG1 integrates a CMOS-based error amplifier, precision voltage reference, and internal resistor network to maintain stable 3.3V output across line, load, and temperature variations. Its architecture enables fast transient response and compatibility with low-ESR ceramic capacitors without external compensation.
It implements overcurrent protection (50mA short-circuit limit), thermal shutdown, and an integrated 5MΩ pull-down resistor on the CE pin-ensuring reliable power sequencing and zero-current disable state. The device operates within 2V to 6V input range and maintains regulation down to 3.45V input at full 150mA load (150mV dropout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures stable supply for 3.3V logic, ADC references, and RF front-ends without external trimming |
| Dropout Voltage | 150mV typ @ 100mA - enables operation from single-cell Li-ion (3.0V min) or dual-cell alkaline sources |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase jitter in clock-sensitive circuits and noise coupling into analog signal paths |
| PSRR | 70dB @ 10kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Quiescent Current | 25µA typ - extends battery life in always-on sensor nodes and standby modes |
| Standby Current | 0.1µA typ - enables deep-sleep power management when CE = low |
| Load Regulation | 12mV typ (1mA–80mA) - maintains voltage stability during dynamic current draw in microcontroller peripherals |
| Line Regulation | 4mV typ (2.3V–6V input) - rejects input ripple and sag from shared power rails |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, JEDEC MO-178AC compliant, rated for -40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output | Delivers stable 3.3V to load; requires ≥1µF ceramic capacitor for stability and low-noise filtering |
| 2 GND | Power ground reference | Low-impedance return path for output current and internal bias; must be connected directly to PCB ground plane |
| 3 VIN | Input supply | Accepts 2V–6V unregulated input; minimum headroom 150mV required for regulation at 100mA |
| 4 CE | Enable control | Active-high logic input; internal 5MΩ pull-down ensures default OFF state; compatible with 1.5V logic high threshold |
| 5 NC | No connection | Unbonded pad; must remain floating-no routing or soldering permitted |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µVrms enables clean power for RF transceivers, PLLs, and high-resolution ADCs without additional filtering |
| High PSRR at 10kHz | 70dB rejection preserves signal integrity when powered from noisy switcher-derived rails |
| Low dropout at full load | 150mV @ 100mA allows use with aging batteries or low-headroom systems while maintaining regulation |
| Integrated CE pull-down | 2.5–10MΩ internal resistor eliminates need for external pull-down, simplifying board layout and BOM |
| Ceramic capacitor compatible | Stable with ≥1µF X5R/X7R ceramics (ESR 0.01–100Ω), reducing footprint vs. tantalum alternatives |
| Precision output accuracy | ±2% tolerance over temperature and load ensures reliable interface with 3.3V I/O standards and memory interfaces |
Applications
| Wireless Sensor Node Power | Portable Audio DAC Supply |
|---|---|
|
Use Scenario: Powering BLE/Wi-Fi SoC and MEMS sensors in battery-operated IoT endpoints. IC Role / Device Role / Timing Role: Primary 3.3V rail regulator with CE-controlled sleep/wake sequencing. Use Value: 0.1µA shutdown current extends shelf life; 30µVrms noise prevents RF desense and sensor offset drift. |
Use Scenario: Clean analog supply for stereo DAC and headphone amplifier in portable media players. IC Role / Device Role / Timing Role: Low-noise post-regulator decoupling upstream DC/DC converter ripple. Use Value: 70dB PSRR at audio band frequencies eliminates audible switching artifacts; ±2% accuracy ensures consistent DAC reference scaling. |
| Industrial PLC I/O Module | Medical Wearable Front-End |
|
Use Scenario: Powering isolated digital I/O drivers and RS-485 transceivers in compact field modules. IC Role / Device Role / Timing Role: Local 3.3V regulator with fast load transient response for burst-mode communication. Use Value: 12mV load regulation maintains logic thresholds during 100mA pulse currents; SOT-23-5 enables dense board layout. |
Use Scenario: Supplying ECG/PPG analog front-end and low-power MCU in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: Ultra-low-noise bias source for instrumentation amplifiers and ADC reference buffers. Use Value: 30µVrms noise avoids baseline wander in sub-µV biomedical signals; -40°C to +85°C rating supports clinical environment operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | Higher dropout (280mV @ 250mA), lower PSRR (60dB @ 10kHz), no CE pin | Lacks enable control and has higher noise (45µVrms); suitable only for non-sequenced, low-transient apps | Select only if CE functionality and <30µVrms noise are not required |
| TPS7A2033PDBVR | Lower quiescent current (6.5µA), same 30µVrms noise, but 220mV dropout @ 300mA | Better for ultra-low-power always-on designs; less suitable for low-input-voltage battery operation | Prefer when standby current dominates system budget, not when input headroom is constrained |
Compared with MCP1700T-3302E/TT and TPS7A2033PDBVR, the AP2122AK-3.3TRG1 uniquely balances ultra-low noise, low dropout, and integrated enable with minimal external components-making it optimal for space-constrained, battery-fed systems requiring both precision and power efficiency.
Availability
AP2122AK-3.3TRG1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable audio DAC supplies, industrial PLC I/O modules, and medical wearable front-ends requiring stable component supply with traceable RoHS-compliant sourcing.
Supply support for AP2122AK-3.3TRG1 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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP2122 series belongs to Diodes' precision LDO portfolio, designed specifically for noise-sensitive, battery-powered applications where regulation accuracy, transient response, and ultra-low quiescent current are critical.
FAQ
What is the minimum input voltage required for regulation at 150mA output?
The AP2122AK-3.3TRG1 requires VIN ≥ 3.45V to maintain 3.3V output at 150mA, based on its maximum dropout of 150mV under that load. Below this, output voltage drops linearly with input; operation below 2V input is prohibited per absolute maximum ratings.
Can the AP2122AK-3.3TRG1 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 < 100Ω.
Is the CE pin compatible with 1.8V logic-level microcontrollers?
Yes. The CE pin recognizes logic high at ≥1.5V, making it fully compatible with 1.8V GPIO outputs. Its internal 5MΩ pull-down ensures reliable disable state when left unconnected or driven low by open-drain logic.
Does the AP2122AK-3.3TRG1 include thermal shutdown protection?
Yes. The device incorporates thermal shutdown that activates at +150°C junction temperature, latching off until die temperature falls below the hysteresis threshold. This protects against sustained overload or inadequate PCB copper area in SOT-23-5 layout.
AP2122AK-3.3TRG1 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):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (10kHz)
- 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
AP2122AK-3.3TRG1 FAQ
1.How can I place an order for AP2122AK-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-3.3TRG1 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 AP2122AK-3.3TRG1 reliable?
The price and inventory of AP2122AK-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-3.3TRG1?
AP2122AK-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-3.3TRG1 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 AP2122AK-3.3TRG1?
For technical support, including AP2122AK-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-3.3TRG1 requirements.
6.How does Aetrix verify that AP2122AK-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-3.3TRG1 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 AP2122AK-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-3.3TRG1?
All AP2122AK-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-3.3TRG1, 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 AP2122AK-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2122AK-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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