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Diodes Incorporated AP2122AK-3.2TRE1
- Part No.:
- AP2122AK-3.2TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-3.2TRE1.pdf
- Description:
- IC REG LINEAR 3.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
AP2122AK-3.2TRE1 from Diodes Incorporated is a fixed-output 3.2V 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 circuitry in portable battery-powered systems.
For engineers reviewing the AP2122AK-3.2TRE1 datasheet, AP2122AK-3.2TRE1 pinout, AP2122AK-3.2TRE1 application, or AP2122AK-3.2TRE1 equivalent, key selection criteria include ultra-low noise performance, high PSRR (70dB @ 10kHz), active-high enable control with internal pull-down, and compatibility with 1µF ceramic output capacitors.
Technical Context
The AP2122AK-3.2TRE1 integrates a CMOS-based error amplifier, precision voltage reference, and resistor network to maintain stable 3.2V output across line (2V–6V input), load (1mA–150mA), and temperature (−40°C to +85°C) variations. Its architecture supports fast transient response and eliminates need for external compensation.
It features an active-high chip enable (CE) pin with 1.5V logic-high threshold and 0.25V logic-low threshold, internal 5MΩ pull-down resistor, and thermal shutdown protection. The device operates with only 25µA quiescent current and 0.1µA standby current, enabling long battery life in always-on subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.2V ±2% - ensures stable biasing for 3.3V-tolerant analog ICs without external feedback. |
| Max Output Current | 150mA continuous - sufficient to power RF transceivers, ADCs, or sensor signal chains. |
| Dropout Voltage | 150mV typ. @ 100mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.2V min). |
| Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase jitter in clock buffers and SNR degradation in audio/RF front-ends. |
| PSRR | 70dB @ 10kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Quiescent Current | 25µA typ. - reduces no-load power loss in sleep-mode subsystems (e.g., real-time clocks, wake-on-event sensors). |
| Enable Threshold | CE high ≥1.5V, low ≤0.25V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
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 clean 3.2V to load; requires ≥1µF ceramic capacitor (ESR 0.01–100Ω) for stability. |
| 2 GND | Power ground | Common return path for input, output, and internal circuits; must be low-impedance connection to PCB ground plane. |
| 3 VIN | Input supply | Accepts 2V–6V unregulated input; minimum headroom of 150mV required for regulation at 100mA. |
| 4 CE | Enable control | Active-high digital input; internal 5MΩ pull-down ensures default shutdown on power-up or floating state. |
| 5 NC | No connection | Unbonded die pad; must remain unconnected and unpopulated on PCB to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 30µVrms output noise enables use in PLL VCO supplies and high-resolution SAR ADC references. |
| High PSRR at mid-band | 70dB rejection at 10kHz allows co-location with noisy buck converters without additional filtering. |
| Low-quiescent-current enable | 0.1µA standby current during CE = low extends battery life in intermittently active modules. |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics (no ESR requirement) - reduces BOM count and board area vs. tantalum solutions. |
| Precision output accuracy | ±2% over temperature and load ensures reliable operation of 3.3V I/O interfaces without margining overhead. |
Applications
| Portable Audio Codec Power | RF Transceiver Bias Rail |
|---|---|
|
Use Scenario: Powers DAC/ADC section of Bluetooth headset audio SoC where switching noise degrades THD+N. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying 3.2V to analog signal chain, decoupling from noisy system PMIC. Use Value: 30µVrms noise prevents audible hiss; 70dB PSRR blocks 2MHz DC-DC ripple from corrupting 16-bit audio resolution. |
Use Scenario: Supplies 3.2V bias to PA driver stage in sub-GHz ISM band transceiver module. IC Role / Device Role / Timing Role: Stable voltage source for RF power amplifier bias network, minimizing AM-to-PM distortion. Use Value: ±2% output accuracy maintains consistent PA gain across temperature; 150mV dropout preserves efficiency at end-of-battery voltage. |
| IoT Sensor Node Core Supply | Wearable Heart Rate Monitor Analog Front-End |
|
Use Scenario: Powers microcontroller core and low-power sensor interface in coin-cell–operated environmental sensor node. IC Role / Device Role / Timing Role: Always-on LDO providing regulated 3.2V during deep-sleep (0.1µA ISTD) and active measurement cycles. Use Value: 0.1µA shutdown current extends 10-year battery life; 25µA IQ enables rapid wake-up without voltage settling delay. |
Use Scenario: Supplies photodiode transimpedance amplifier and LED driver in optical PPG sensor subsystem. IC Role / Device Role / Timing Role: Ultra-low-noise local regulator isolating analog front-end from digital MCU noise. Use Value: 30µVrms noise floor ensures <100nA current measurement resolution; ±2% accuracy maintains LED intensity calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-33WG-7 | 3.3V output, 250mA rating, 200mV dropout @ 150mA, 45µVrms noise | Higher output voltage and current, but higher noise and dropout - suitable when 3.3V tolerance permits and load exceeds 150mA | Select if system requires 3.3V nominal rail and can accept 15µVrms higher noise floor. |
| MCP1700-3302E/TO | 3.3V output, 250mA, 178mV dropout @ 250mA, 30µVrms noise, SOT-23-3 package | No enable pin, 3-pin package - simpler layout but lacks shutdown control and has fixed 3.3V output | Choose when enable functionality is unnecessary and board space constraints favor 3-pin footprint. |
Compared with AP7315-33WG-7 and MCP1700-3302E/TO, the AP2122AK-3.2TRE1 uniquely combines 3.2V output, 150mV dropout, and 30µVrms noise in a 5-pin enable-capable package-making it optimal for noise-critical 3.2V rails where precise voltage matching and dynamic power gating are required.
Availability
AP2122AK-3.2TRE1 is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor nodes, and battery-powered audio equipment requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for AP2122AK-3.2TRE1 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 devices for power management, signal integrity, and connectivity applications.
The AP2122 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and small-footprint packaging.
FAQ
What is the minimum input voltage required for regulation at full 150mA load?
The AP2122AK-3.2TRE1 requires VIN ≥ VOUT + VDROP. At 150mA, typical dropout is 200mV (max 400mV per datasheet), so minimum input is 3.4V (typical) or 3.6V (worst-case). Below this, output voltage drops linearly with input.
Can the AP2122AK-3.2TRE1 be used with a 0.47µF output capacitor?
No. The datasheet specifies a minimum 1µF ceramic output capacitor (ESR 0.01–100Ω) for stability. Using 0.47µF risks oscillation and degraded transient response, as confirmed by stability testing in DS41210 Rev. 3 Section 8.2.
Is the NC pin (Pin 5) electrically isolated or internally connected?
Pin 5 is a true no-connect terminal: it is not bonded to any internal die structure and has no electrical function. PCB layout must leave it unconnected and unmasked to prevent solder bridging or parasitic coupling.
How does the CE pin behave during power-up if left floating?
The CE pin contains an internal 5MΩ pull-down resistor, ensuring it defaults to logic-low (≤0.25V) at power-up. This forces the device into shutdown until a valid high-level signal (≥1.5V) is applied, preventing uncontrolled output activation.
AP2122AK-3.2TRE1 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):
- 3.2V
- 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-3.2TRE1 FAQ
1.How can I place an order for AP2122AK-3.2TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-3.2TRE1 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-3.2TRE1 reliable?
The price and inventory of AP2122AK-3.2TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-3.2TRE1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-3.2TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-3.2TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-3.2TRE1?
AP2122AK-3.2TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-3.2TRE1 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-3.2TRE1?
For technical support, including AP2122AK-3.2TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-3.2TRE1 requirements.
6.How does Aetrix verify that AP2122AK-3.2TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-3.2TRE1 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-3.2TRE1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-3.2TRE1?
All AP2122AK-3.2TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-3.2TRE1, 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-3.2TRE1 part is unused and in its original packaging.
Return procedure for AP2122AK-3.2TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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