My Inquiry
My Account
Diodes Incorporated AP2122AK-3.3TRE1
- Part No.:
- AP2122AK-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,514
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2122AK-3.3TRE1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator in SOT-23-5 package, delivering up to 150mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy. It serves as a precision power supply for noise-sensitive analog and RF circuitry in portable battery-powered systems.
For engineers reviewing the AP2122AK-3.3TRE1 datasheet, AP2122AK-3.3TRE1 pinout, AP2122AK-3.3TRE1 application, or AP2122AK-3.3TRE1 equivalent, key selection criteria include ultra-low noise performance, CMOS-based low-quiescent-current operation (25µA typ), active-high enable control with internal pull-down, and compatibility with 1µF ceramic output capacitors.
Technical Context
The AP2122AK-3.3TRE1 integrates a CMOS-based error amplifier, precision voltage reference, and resistor network to maintain stable 3.3V output across load (1mA–150mA) and line (3.8V–6V input) variations. Its architecture enables fast transient response and high PSRR (70dB @ 10kHz) without requiring external compensation.
It features an active-high chip enable (CE) pin with built-in 5MΩ pull-down resistor, allowing controlled shutdown with standby current of 0.1µA. The device operates over –40°C to +85°C junction temperature and supports low-ESR ceramic capacitors down to 1µF for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures stable rail for 3.3V logic, ADC references, and RF front-ends |
| Dropout Voltage | 150mV typ @ 100mA - enables regulation from 3.45V input, critical for single-cell Li-ion or 3.6V battery systems |
| Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and jitter in clocked data converters |
| 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 low-power MCU sleep modes |
| Enable Threshold | VCE(HI) ≥ 1.5V, VCE(LO) ≤ 0.25V - compatible with 1.8V/3.3V GPIO without level-shifting |
| Thermal Resistance | θJA = 250°C/W - defines maximum power dissipation (e.g., 250mW at TA = 85°C) in standard PCB layout |
Pinout & Package
SOT-23-5 surface-mount package with 1.7mm × 2.8mm footprint, 1.3mm height, and gull-wing leads. Thermal pad not present; θJA = 250°C/W on standard 1-oz copper FR4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output | Delivers clean 3.3V to load; requires ≥1µF ceramic capacitor placed adjacent to pin |
| 2 GND | Power ground | Low-impedance return path for output current and internal bias; must connect directly to power plane |
| 3 VIN | Input supply | Accepts 3.8V–6V input; requires 1µF ceramic capacitor within 5mm of pin |
| 4 CE | Enable control | Active-high logic input with internal 5MΩ pull-down; drives LDO into 0.1µA shutdown when low |
| 5 NC | No connection | Unbonded die pad; must remain floating-no trace or solder mask opening required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µVrms (10Hz–100kHz) enables direct powering of RF synthesizers and precision ADCs without additional filtering |
| CMOS process architecture | Enables 25µA quiescent current and 0.1µA shutdown current-critical for multi-year battery life in IoT endpoints |
| High PSRR at 10kHz | 70dB rejection of ripple from switching regulators allows co-location with DC/DC converters on compact PCBs |
| 1µF ceramic capacitor support | Eliminates need for tantalum or electrolytic output caps-reduces BOM cost, improves reliability, and saves board space |
| Integrated CE pull-down | 5MΩ internal resistor ensures defined shutdown state without external components-simplifies power sequencing design |
Applications
| Wireless Sensor Node Power | Portable Audio DAC Supply |
|---|---|
Use Scenario: Sub-100µA sleep-mode operation with periodic wake-up for environmental sensing and BLE transmission. IC Role / Device Role / Timing Role: Primary 3.3V rail generator for MCU, radio SoC, and analog front-end. Use Value: 25µA quiescent current and 0.1µA shutdown extend CR2032 battery life beyond 5 years; 30µVrms noise prevents RF desense during transmission. |
Use Scenario: High-fidelity audio playback in Bluetooth headphones using a 3.3V-powered stereo DAC and Class-D amplifier. IC Role / Device Role / Timing Role: Clean analog supply for DAC reference and output buffer stages. Use Value: 30µVrms noise floor preserves >110dB SNR; 70dB PSRR rejects noise from wireless baseband processor's DC/DC converter. |
| Industrial PLC I/O Module | Medical Wearable Signal Chain |
Use Scenario: Isolated 3.3V supply for digital isolator and RS-485 transceiver in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Post-isolation regulated rail for communication interface ICs. Use Value: ±2% output accuracy ensures reliable logic-level margin across –40°C to +85°C; 150mV dropout allows use with 3.6V isolated buck output. |
Use Scenario: ECG front-end powering instrumentation amplifier, 24-bit delta-sigma ADC, and low-power microcontroller. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply for signal conditioning and conversion stages. Use Value: 30µVrms noise avoids degradation of sub-µV biopotential signals; 1µF ceramic compatibility reduces size in constrained wearable form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-33SA-7 | Higher quiescent current (50µA typ), lower PSRR (60dB @ 10kHz), same 3.3V output and SOT-23-5 package | Less suitable for multi-year battery life or RF-sensitive designs due to higher noise and lower ripple rejection | Preferred where cost sensitivity outweighs ultra-low-noise requirements and existing AP7315 footprint reuse is needed |
| MCP1700-3302E/TO | TO-92 package, 2.5µA quiescent current, but only 60dB PSRR and 40µVrms noise; no enable pin | Lacks CE control and higher noise limit use in dynamic power-gated systems or precision analog rails | Applicable only in through-hole legacy designs prioritizing ultra-low IQ over noise and controllability |
Compared with AP7315-33SA-7 and MCP1700-3302E/TO, the AP2122AK-3.3TRE1 uniquely balances ultra-low noise (30µVrms), high PSRR (70dB), and active enable control in a miniature SOT-23-5 package-making it optimal for space-constrained, battery-powered, noise-critical signal chains.
Availability
AP2122AK-3.3TRE1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable audio devices, industrial I/O modules, and medical wearables requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AP2122AK-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP2122 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered and noise-sensitive electronics requiring ultra-low noise, low dropout, and minimal quiescent current.
FAQ
What is the minimum input voltage required for regulation at full 150mA load?
The AP2122AK-3.3TRE1 requires VIN ≥ VOUT + VDROP. At 150mA, typical dropout is 200mV (max 400mV per datasheet), so minimum input is 3.5V (typical) or 3.7V (guaranteed). Operation below this causes output droop or dropout.
Can the NC pin (Pin 5) be connected to ground or left floating?
Pin 5 is a true no-connect terminal with no internal bond wire. It must remain electrically floating-neither grounded nor tied to any net. Connecting it risks internal shorting or parametric shift due to parasitic coupling.
Is an input capacitor mandatory, and what value is recommended?
Yes, a 1µF ceramic capacitor is mandatory at VIN per datasheet Note 1. It must be placed within 5mm of Pin 3 (VIN) and have low ESR (<100mΩ) to ensure stability and transient response. Omitting it risks oscillation or excessive input ripple propagation.
How does the CE pin behave during power-up when VIN ramps slowly?
The CE pin has no power-on reset function. If CE is driven high before VIN reaches 3.8V, the LDO remains disabled until VIN exceeds the minimum operating voltage. For reliable startup, synchronize CE assertion with VIN > 3.8V or use a simple RC delay on CE.
AP2122AK-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):
- 0.4V @ 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-3.3TRE1 FAQ
1.How can I place an order for AP2122AK-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-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 AP2122AK-3.3TRE1 reliable?
The price and inventory of AP2122AK-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 AP2122AK-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-3.3TRE1?
AP2122AK-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-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 AP2122AK-3.3TRE1?
For technical support, including AP2122AK-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-3.3TRE1 requirements.
6.How does Aetrix verify that AP2122AK-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-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 AP2122AK-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-3.3TRE1?
All AP2122AK-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-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 AP2122AK-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2122AK-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2122AK-3.3TRE1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…
Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …
Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
