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Diodes Incorporated AP2121AK-3.2TRG1
- Part No.:
- AP2121AK-3.2TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-3.2TRG1.pdf
- Description:
- IC REG LINEAR 3.2V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,935
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Product details
Overview
AP2121AK-3.2TRG1 from Diodes Incorporated is a high-speed, extremely low-noise 3.2V 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 an active-high enable pin, current-limit protection, and supports ceramic capacitors as low as 1µF-optimized for powering RF sections and precision analog circuitry in portable battery-operated devices.
For engineers reviewing the AP2121AK-3.2TRG1 datasheet, AP2121AK-3.2TRG1 pinout, AP2121AK-3.2TRG1 application, or AP2121AK-3.2TRG1 equivalent, key selection criteria include ultra-low noise performance, high PSRR (70dB @ 1kHz), sub-1µA standby current, and compatibility with compact 1µF ceramic output capacitance in space-constrained designs.
Technical Context
The AP2121AK-3.2TRG1 employs a CMOS-based error amplifier architecture with internal voltage reference and resistor network for precise 3.2V regulation. Its high PSRR (70dB @ 1kHz) and excellent transient response stem from fast loop bandwidth and low output impedance.
It features active-high CE control with 1.5V logic-high threshold and 0.25V logic-low threshold, integrated short-circuit current limit (50mA), and thermal shutdown. The device operates across -40°C to +85°C ambient and supports input voltages from 2V to 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.2V ±2% - ensures stable supply for 3.3V-tolerant I/O or core rails requiring tight regulation. |
| Max Output Current | 200mA continuous - sufficient for powering single-core microcontrollers or RF transceivers. |
| Dropout Voltage | 150mV typ. @ 100mA - enables operation from 3.35V input when VOUT = 3.2V, maximizing battery runtime. |
| Output Noise | 30µVrms (10Hz–100kHz) - critical for noise-sensitive analog/RF stages like ADC references or VCO power. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 25µA typ. - minimizes standby power loss in always-on sensor nodes or wake-on-event systems. |
| Standby Current | 0.1µA typ. - enables multi-year battery life in low-duty-cycle IoT endpoints when CE = low. |
| Input Voltage Range | 2V to 6V - compatible with single-cell Li-ion (3.0–4.2V), two-cell alkaline (2.0–3.2V), or regulated 5V rails. |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, JEDEC MO-178AC compliant, rated for 250°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Enable input | Active-high logic control: ≥1.5V enables regulation; ≤0.25V disables output and reduces current to 0.1µA. |
| 2 (GND) | Ground reference | Common return path for input, output, and internal circuitry; requires low-impedance PCB connection. |
| 3 (VIN) | Input supply | Accepts 2V–6V; requires ≥1µF ceramic input capacitor placed near pin for stability and ripple filtering. |
| 4 (NC) | No connection | Internally unconnected; must be left floating or tied to GND per layout best practice-no electrical function. |
| 5 (VOUT) | Regulated output | Delivers 3.2V ±2%; requires ≥1µF ceramic output capacitor (ESR 0.01–100Ω) for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 30µVrms (10Hz–100kHz) - preserves signal integrity in audio codecs, RF front-ends, and precision sensors. |
| High PSRR at 1kHz | 70dB - rejects ripple from noisy switchers without requiring additional LC filtering stages. |
| Low dropout at full load | 150mV @ 100mA - extends usable battery voltage range by >100mV vs. legacy LDOs. |
| Sub-1µA shutdown current | 0.1µA typical - enables energy harvesting and long-life coin-cell applications. |
| Ceramic capacitor compatible | Stable with ≥1µF, ESR 0.01–100Ω - eliminates need for bulkier, less reliable tantalum or electrolytic caps. |
| ±2% output accuracy | Over -40°C to +85°C and line/load variation - meets tight tolerance requirements of ADC references and PLL supplies. |
Applications
| Wireless Sensor Node Power | Portable Audio Codec Supply |
|---|---|
|
Use Scenario: Battery-powered Zigbee/Bluetooth LE node with MCU, radio, and analog sensor interface. IC Role / Device Role / Timing Role: Primary 3.2V LDO supplying MCU I/O bank and RF transceiver VDDIO. Use Value: 30µVrms noise prevents RF desensitization; 0.1µA shutdown current enables 10+ year shelf life on CR2032. |
Use Scenario: Handheld voice recorder using MEMS microphone and stereo audio DAC. IC Role / Device Role / Timing Role: Low-noise bias rail for microphone preamp and DAC reference buffer. Use Value: 70dB PSRR suppresses digital switching noise from MCU clock domain, reducing audible artifacts. |
| Industrial Camera Module | Medical Pulse Oximeter |
|
Use Scenario: Compact HD camera module with CMOS image sensor and ISP ASIC. IC Role / Device Role / Timing Role: Dedicated 3.2V supply for image sensor analog front-end and PLL clock generation. Use Value: ±2% accuracy maintains consistent pixel gain calibration; 150mV dropout sustains operation down to 3.35V battery voltage. |
Use Scenario: Wearable pulse oximeter with photodiode amplifier and ADC. IC Role / Device Role / Timing Role: Ultra-low-noise 3.2V rail for transimpedance amplifier and 16-bit sigma-delta ADC. Use Value: 30µVrms noise floor directly improves SpO₂ measurement resolution and SNR by >12dB. |
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 | 3.3V output, 300mA rating, 250mV dropout @ 300mA, same SOT-23-5 package. | Higher output voltage and current; not drop-in for 3.2V systems requiring exact voltage match. | Select only if system can tolerate 3.3V and requires higher load capability. |
| MCP1700-3302E/TO | 3.3V output, 250mA, 6µA quiescent current, TO-92 package - no enable pin, different footprint. | Lacks CE control and SOT-23-5 compatibility; unsuitable for space-constrained or enable-controlled designs. | Use only in cost-sensitive, non-enable, through-hole applications where 3.3V is acceptable. |
Compared with AP2121AK-3.2TRG1, AP7343-33WG-7 offers higher current but mismatches the 3.2V requirement, while MCP1700-3302E/TO sacrifices enable functionality and package compatibility for ultra-low IQ-neither provides identical 3.2V/low-noise/enable/SOT-23-5 combination.
Availability
AP2121AK-3.2TRG1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable audio devices, industrial camera modules, and medical wearables requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP2121AK-3.2TRG1 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 ICs for power management, signal integrity, and connectivity applications.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal quiescent current.
FAQ
What is the minimum input voltage required for AP2121AK-3.2TRG1 to maintain regulation?
The AP2121AK-3.2TRG1 requires VIN ≥ (VOUT + VDROP). At 100mA load, typical dropout is 150mV, so minimum VIN = 3.2V + 0.15V = 3.35V. At light loads (<10mA), dropout drops to ~20mV, allowing operation down to ~3.22V. Input must remain ≥2V per absolute ratings, but regulation ceases below VOUT + actual dropout.
Can AP2121AK-3.2TRG1 be used with a 1µF ceramic output capacitor?
Yes-the datasheet explicitly states stability with ≥1µF ceramic capacitors having ESR between 0.01Ω and 100Ω. This eliminates need for larger, higher-ESR tantalum or aluminum electrolytic capacitors, reducing board area and improving reliability in portable designs.
Is AP2121AK-3.2TRG1 qualified for automotive applications?
No-AP2121AK-3.2TRG1 is not AEC-Q100 qualified. Diodes Incorporated notes that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and consumer portable equipment only.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
Diodes recommends migrating to AP7343 due to its improved specifications: higher output current (300mA), lower dropout (250mV @ 300mA), and enhanced thermal performance. However, AP2121AK-3.2TRG1 remains fully supported for existing designs and legacy BOMs with verified 3.2V operation.
AP2121AK-3.2TRG1 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):
- 0.5V @ 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-3.2TRG1 FAQ
1.How can I place an order for AP2121AK-3.2TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-3.2TRG1 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-3.2TRG1 reliable?
The price and inventory of AP2121AK-3.2TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-3.2TRG1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-3.2TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-3.2TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-3.2TRG1?
AP2121AK-3.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-3.2TRG1 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-3.2TRG1?
For technical support, including AP2121AK-3.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-3.2TRG1 requirements.
6.How does Aetrix verify that AP2121AK-3.2TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-3.2TRG1 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-3.2TRG1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-3.2TRG1?
All AP2121AK-3.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-3.2TRG1, 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-3.2TRG1 part is unused and in its original packaging.
Return procedure for AP2121AK-3.2TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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