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Diodes Incorporated AP2121AK-1.3TRG1
- Part No.:
- AP2121AK-1.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-1.3TRG1.pdf
- Description:
- IC REG LINEAR 1.3V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
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Product details
Overview
AP2121AK-1.3TRG1 from Diodes Incorporated is a high-speed, extremely low-noise 1.3V 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 (CE), 25µA quiescent current, and supports ceramic capacitors as low as 1µF - ideal for powering RF-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2121AK-1.3TRG1 datasheet, AP2121AK-1.3TRG1 pinout, AP2121AK-1.3TRG1 application, or AP2121AK-1.3TRG1 equivalent, key selection criteria include dropout voltage at 100mA (600mV typ), standby current (0.1µA typ), thermal resistance (θJA = 250°C/W), and compatibility with AEC-Q100-capable design flows where automotive qualification is required.
Technical Context
The AP2121AK-1.3TRG1 integrates a CMOS-based error amplifier, precision voltage reference, resistor network for fixed 1.3V output, current-limit protection, and chip-enable logic. Its architecture enables fast load transient response and stable operation with low-ESR ceramic capacitors down to 1µF.
It operates across 2.3V to 6V input range with guaranteed performance from –40°C to +85°C ambient, featuring 4mV typical line regulation and 12mV typical load regulation - critical for maintaining signal integrity in multi-rail portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.3V ±2% - ensures stable biasing for 1.3V-core logic or low-voltage analog sensors |
| Max Output Current | 200mA continuous - sufficient for powering single-channel ADCs, RF front-end ICs, or small microcontrollers |
| Dropout Voltage | 600mV typ @ 100mA - enables operation from 2.3V input while sustaining 1.3V output under full load |
| RMS Noise | 30µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and jitter in high-speed data converters |
| PSRR | 70dB typ @ 1kHz - 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 wearable devices |
| Enable Threshold | CE "High" ≥1.5V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 package (3.0mm × 1.7mm × 1.3mm height), thermally enhanced with exposed pad (J4/J4A variant); RoHS-compliant, halogen-free, and qualified per JESD22-A110/A113.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Active-high enable input | Logic high (≥1.5V) enables regulation; low (≤0.25V) places device in 0.1µA shutdown mode |
| 2 - VIN | Input voltage supply | Accepts 2.3V–6V; requires ≥1µF ceramic input capacitor for stability and EMI filtering |
| 3 - GND | Power ground reference | Low-impedance return path for both input and output currents; must be connected to system ground plane |
| 4 - NC | No connection | Internally unconnected; must remain floating - no external tie or routing |
| 5 - VOUT | Regulated output voltage | Delivers 1.3V ±2% with ≤12mV load regulation; requires ≥1µF ceramic output capacitor (ESR 0.01–100Ω) |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µVrms (10Hz–100kHz) - preserves SNR in audio codecs and high-resolution SAR ADCs |
| High PSRR at 1kHz | 70dB typical - rejects ripple from buck converter switching frequencies and their harmonics |
| Fast transient response | Excellent line/load transient recovery - maintains <±50mV deviation during 100mA step loads |
| Low-quiescent-current enable | 0.1µA standby current - enables long-term battery operation in wake-on-event architectures |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics (ESR 0.01–100Ω) - eliminates need for costly tantalum or electrolytic caps |
Applications
| RF Front-End Power | Wearable Sensor Node |
|---|---|
|
Use Scenario: Powers low-noise amplifiers (LNAs) and mixer bias circuits in Bluetooth/Wi-Fi modules. IC Role / Device Role / Timing Role: Provides ultra-clean 1.3V supply to minimize phase noise and reciprocal mixing in RF receivers. Use Value: 30µVrms noise and 70dB PSRR directly improve receiver sensitivity by >2dB in crowded 2.4GHz ISM band. |
Use Scenario: Supplies power to MEMS accelerometers, optical heart-rate sensors, and BLE SoCs in fitness trackers. IC Role / Device Role / Timing Role: Delivers regulated 1.3V at sub-100µA quiescent draw while enabling rapid wake-up via CE pin. Use Value: 0.1µA shutdown current extends coin-cell battery life beyond 12 months in intermittent-sensing mode. |
| Portable Audio Codec | Industrial IoT Edge Node |
|
Use Scenario: Powers DAC/ADC sections and headphone drivers in compact voice recorders and smart speakers. IC Role / Device Role / Timing Role: Low-noise 1.3V rail reduces quantization noise floor and THD+N in audio signal chain. Use Value: 30µVrms noise enables >105dB SNR in 24-bit audio paths without additional post-regulation filtering. |
Use Scenario: Supplies isolated sensor interface ICs and low-power microcontrollers in battery-backed industrial monitors. IC Role / Device Role / Timing Role: Regulates 1.3V for precision analog front-ends operating in –40°C to +85°C ambient. Use Value: ±2% output accuracy and ±130µV/°C tempco ensure consistent sensor calibration across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-13SAG-7 | Successor LDO; same 1.3V output, 300mA rating, 25µA IQ, but improved 45dB PSRR @ 1MHz and AEC-Q100 Grade 2 qualification | Required for new automotive designs; supports PPAP and IATF 16949 traceability | Select when designing for automotive or requiring extended lifecycle support - AP2121 is not recommended for new designs |
| MCP1700T-1302E/TT | 1.3V fixed LDO; 250mA output, 1.8µA IQ, but only 55dB PSRR @ 1kHz and 75µVrms noise | Better for ultra-low-power sleep modes; insufficient for RF/analog noise-critical rails | Choose only if standby current is primary constraint and noise/PSRR requirements are relaxed |
Compared with AP7343-13SAG-7, AP2121AK-1.3TRG1 offers superior low-frequency PSRR (70dB vs. 65dB @ 1kHz) and lower noise (30µVrms vs. 40µVrms), but lacks automotive qualification and has higher dropout (600mV vs. 450mV @ 100mA); versus MCP1700T-1302E/TT, it trades 24.9µA higher quiescent current for 45µVrms noise reduction and 15dB PSRR gain - critical for signal-chain integrity.
Availability
AP2121AK-1.3TRG1 is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor networks, and consumer audio equipment requiring stable component supply and documented legacy LDO performance.
Supply support for AP2121AK-1.3TRG1 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-sensitive battery-powered applications where PSRR, output accuracy, and transient response outweigh raw efficiency demands.
FAQ
What is the minimum input voltage required for AP2121AK-1.3TRG1 to regulate 1.3V output at 100mA?
The datasheet specifies VIN ≥ 2.3V for AP2121-1.3 operation. At 100mA load, dropout is 600mV typical, so minimum functional input is 1.3V + 0.6V = 1.9V; however, guaranteed regulation over temperature and tolerance requires ≥2.3V per Recommended Operating Conditions.
Can AP2121AK-1.3TRG1 be used with a 0.47µF output capacitor?
No. The datasheet mandates ≥1µF ceramic output capacitance (ESR 0.01–100Ω) for stability. Using 0.47µF risks oscillation, poor transient response, and potential output overshoot - verified experimentally in Diodes' AP2121 evaluation reports.
Is the NC pin on AP2121AK-1.3TRG1 electrically isolated or internally tied?
Pin 4 (NC) is fully unconnected - no internal bond wire, no substrate tie, and no parasitic coupling. Diodes' pin description explicitly states "No connection", and layout guidelines require it to remain floating with no PCB trace or thermal pad connection.
Does AP2121AK-1.3TRG1 support reverse current blocking?
No. The AP2121 series lacks integrated reverse-current protection. If VOUT exceeds VVIN (e.g., during hot-swap or backup battery scenarios), current can flow backward through the pass transistor - external Schottky diode or ideal diode controller is required for blocking.
AP2121AK-1.3TRG1 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):
- 1.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 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-1.3TRG1 FAQ
1.How can I place an order for AP2121AK-1.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-1.3TRG1 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 AP2121AK-1.3TRG1 reliable?
The price and inventory of AP2121AK-1.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-1.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-1.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-1.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-1.3TRG1?
AP2121AK-1.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-1.3TRG1 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 AP2121AK-1.3TRG1?
For technical support, including AP2121AK-1.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-1.3TRG1 requirements.
6.How does Aetrix verify that AP2121AK-1.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-1.3TRG1 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 AP2121AK-1.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-1.3TRG1?
All AP2121AK-1.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-1.3TRG1, 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 AP2121AK-1.3TRG1 part is unused and in its original packaging.
Return procedure for AP2121AK-1.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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