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Diodes Incorporated AP2121AK-1.2TRG1
- Part No.:
- AP2121AK-1.2TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-1.2TRG1.pdf
- Description:
- IC REG LINEAR 1.2V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP2121AK-1.2TRG1 from Diodes Incorporated is a high-speed, extremely low-noise 1.2V fixed-output LDO regulator in SOT-23-5 package, delivering up to 200mA output current with 30µVrms noise (10Hz–100kHz), 70dB PSRR at 1kHz, and ±2% output voltage accuracy. It features active-high enable control, 25µA quiescent current, and supports ceramic output capacitors as low as 1µF - deployed in battery-powered imaging modules and portable audio subsystems.
For engineers reviewing the AP2121AK-1.2TRG1 datasheet, AP2121AK-1.2TRG1 pinout, AP2121AK-1.2TRG1 application, or AP2121AK-1.2TRG1 equivalent, key selection criteria include dropout performance at 100mA (700–900mV), standby current (0.1µA), thermal resistance (θJA = 250°C/W), and compatibility with low-ESR ceramic capacitors in space-constrained designs.
Technical Context
The AP2121AK-1.2TRG1 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit protection circuitry. Its architecture enables stable regulation under fast load transients while maintaining low noise floor via internal filtering and optimized biasing.
It operates across −40°C to +85°C ambient temperature with input voltage range of 2.0V to 6.0V, and requires no external compensation due to inherent stability with ≥1µF ceramic output capacitance and ESR between 0.01Ω and 100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.2V ±2% - ensures stable core supply for 1.2V logic rails in portable SoC subsystems |
| Max Output Current | 200mA continuous - sufficient for powering single-core microcontrollers or sensor signal chains |
| Dropout Voltage | 700–900mV at 100mA - enables operation from single Li-ion cell (≥2.2V input) with margin |
| RMS Noise | 30µVrms (10Hz–100kHz) - critical for analog front-ends and ADC reference supplies |
| PSRR | 70dB at 1kHz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 25µA typical - extends battery life in always-on sensor nodes |
| Standby Current | 0.1µA typical - enables ultra-low-power shutdown mode for system-level energy management |
Pinout & Package
SOT-23-5 package with exposed pad (thermal enhancement), 1.3mm × 2.9mm footprint, 1.45mm height, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Enable input | Active-high logic control; 1.5V min high threshold allows direct interface with 1.8V/3.3V GPIO |
| 2 (GND) | Ground reference | Power and signal return path; must be connected to low-impedance PCB ground plane |
| 3 (VIN) | Input voltage supply | Accepts 2.0–6.0V; requires ≥1µF ceramic input capacitor placed adjacent to pin |
| 4 (NC) | No connection | Internally unconnected; must remain floating - not to be tied to GND or other nets |
| 5 (VOUT) | Regulated output | Delivers 1.2V ±2%; requires ≥1µF ceramic output capacitor with ESR 0.01–100Ω |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVrms output noise enables clean power for RF receivers and precision ADCs without additional filtering |
| Ultra-low standby current | 0.1µA shutdown current permits long-term storage mode in battery-backed IoT edge nodes |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics - eliminates need for larger, less reliable tantalum or electrolytic caps |
| High PSRR at audio frequencies | 70dB rejection at 1kHz suppresses ripple from buck converter switching harmonics near sensitive analog stages |
| Precision output accuracy | ±2% over −40°C to +85°C ensures reliable operation of 1.2V I/O domains without calibration overhead |
Applications
| Mobile Imaging Module | Wearable Biometric Sensor |
|---|---|
|
Use Scenario: Powering CMOS image sensor and ISP core in compact smartphone camera sub-board. IC Role / Device Role / Timing Role: Primary 1.2V LDO supplying sensor analog front-end and digital logic domain. Use Value: 30µVrms noise prevents fixed-pattern noise in raw image data; 70dB PSRR isolates sensor from PMIC switching noise. |
Use Scenario: Regulating power for optical heart-rate monitor (PPG) ASIC in fitness band. IC Role / Device Role / Timing Role: Low-quiescent LDO enabling always-on photodiode bias and ADC reference supply. Use Value: 25µA quiescent current extends battery runtime beyond 7 days; ±2% accuracy maintains PPG signal linearity. |
| Portable Audio DAC Subsystem | Industrial Handheld Scanner |
|
Use Scenario: Providing ultra-clean 1.2V supply to stereo DAC and headphone amplifier IC. IC Role / Device Role / Timing Role: Noise-sensitive analog rail generator decoupled from noisy digital supply domains. Use Value: 30µVrms noise floor preserves SNR >105dB; ceramic capacitor support simplifies layout in tight acoustic zones. |
Use Scenario: Powering barcode decoder ASIC and laser driver in battery-operated handheld scanner. IC Role / Device Role / Timing Role: Stable 1.2V core supply enabling deterministic decode timing and low-latency trigger response. Use Value: 200mA output headroom accommodates peak laser pulse current; 700–900mV dropout sustains operation down to 2.2V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-12SAG-7 | Successor device: lower 150mV dropout at 100mA, 18µA IQ, same SOT-23-5 package | Designed for new designs requiring improved efficiency and thermal performance | Select for new projects; AP2121AK-1.2TRG1 is not recommended for new designs per Diodes documentation |
| MCP1700T-1202E/TT | Microchip part: 2.0µA IQ, 6V max VIN, but only 250mA limit and 40µVrms noise | Better for ultra-low-power sleep modes, worse for noise-critical analog rails | Prefer when standby current dominates design priority over noise or PSRR |
Compared with AP7343-12SAG-7, AP2121AK-1.2TRG1 offers higher noise immunity (30µVrms vs 40µVrms) but significantly higher dropout and quiescent current; versus MCP1700T-1202E/TT, it delivers superior PSRR (70dB vs 60dB) and tighter output accuracy (±2% vs ±3%), at cost of higher IQ.
Availability
AP2121AK-1.2TRG1 is available at Aetrix Electronics and suitable for mobile imaging modules, wearable biometric sensors, portable audio DAC subsystems, and industrial handheld scanners requiring stable component supply with full traceability and lifecycle continuity.
Supply support for AP2121AK-1.2TRG1 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for high-volume industrial and consumer applications.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, designed specifically for noise-sensitive, battery-powered portable electronics requiring precision voltage regulation with minimal board area and thermal overhead.
FAQ
What is the minimum input voltage required for stable 1.2V output at 100mA load?
The AP2121AK-1.2TRG1 requires VIN ≥ 2.2V to maintain regulation at 100mA, based on its 700–900mV dropout specification. Below 2.2V, output voltage drops linearly with input; operation below 2.0V violates absolute maximum ratings and risks functional failure.
Can the NC pin (Pin 4) be grounded or left unconnected?
Pin 4 is internally unconnected and must remain floating - neither grounded nor tied to any net. Connecting it to GND or VOUT may cause unpredictable behavior or damage due to internal structure. PCB layout must isolate this pad with solder mask and clearance.
Is the AP2121AK-1.2TRG1 qualified for automotive applications?
No - AP2121AK-1.2TRG1 is not AEC-Q100 qualified. Diodes explicitly states that automotive-grade variants require separate qualification (e.g., PPAP capability, IATF 16949 manufacturing), and this part is intended for commercial portable electronics only.
Why does the datasheet state "not recommended for new designs"?
Diodes has superseded AP2121AK-1.2TRG1 with AP7343-12SAG-7, which improves dropout (150mV), quiescent current (18µA), and thermal resistance (θJA = 220°C/W). The notice reflects obsolescence planning, not immediate discontinuation - existing designs may continue using AP2121AK-1.2TRG1 under lifecycle support.
AP2121AK-1.2TRG1 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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.9V @ 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-1.2TRG1 FAQ
1.How can I place an order for AP2121AK-1.2TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-1.2TRG1 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-1.2TRG1 reliable?
The price and inventory of AP2121AK-1.2TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-1.2TRG1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-1.2TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-1.2TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-1.2TRG1?
AP2121AK-1.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-1.2TRG1 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-1.2TRG1?
For technical support, including AP2121AK-1.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-1.2TRG1 requirements.
6.How does Aetrix verify that AP2121AK-1.2TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-1.2TRG1 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-1.2TRG1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-1.2TRG1?
All AP2121AK-1.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-1.2TRG1, 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-1.2TRG1 part is unused and in its original packaging.
Return procedure for AP2121AK-1.2TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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