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Diodes Incorporated AP2129K-1.0TRG1
- Part No.:
- AP2129K-1.0TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2129K-1.0TRG1.pdf
- Description:
- IC REG LINEAR 1V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
AP2129K-1.0TRG1 from Diodes Incorporated is a 300mA, fixed-output 1.0V CMOS low-dropout (LDO) regulator in SOT-23-5 package. It delivers ±2% output voltage accuracy, 60µVrms output noise, and 800mV dropout at 300mA load. Designed for battery-powered systems requiring stable, ultra-low-noise supply rails, it powers core logic in portable computing and embedded controllers.
For engineers reviewing the AP2129K-1.0TRG1 datasheet, AP2129K-1.0TRG1 pinout, AP2129K-1.0TRG1 application, or AP2129K-1.0TRG1 equivalent, key selection criteria include dropout voltage at 300mA, standby current under shutdown, PSRR at 1kHz/10kHz, thermal shutdown threshold, and compatibility with 1µF ceramic input/output capacitors.
Technical Context
The AP2129K-1.0TRG1 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a single-stage LDO architecture. Its active-high shutdown pin enables fast enable/disable control with 0.1µA standby current, while internal foldback current limiting and thermal shutdown at +165°C ensure robust fault protection.
It operates across 1.8V–6V input range and maintains regulation down to 1.0V output with only 800mV headroom at full 300mA load. The 50µs soft-start prevents inrush current, and the 60Ω internal VOUT discharge MOSFET ensures rapid output discharge during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0V ±2% over -40°C to +85°C - ensures stable core supply for 1.0V logic domains |
| Max Output Current | 300mA continuous - supports microcontroller cores, sensor interfaces, and low-power peripherals |
| Dropout Voltage | 800mV at 300mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (2.4V min) |
| PSRR | 65dB @ 1kHz, 45dB @ 10kHz - suppresses switching noise from upstream DC/DC converters |
| Output Noise | 60µVrms (10Hz–100kHz) - preserves signal integrity in ADC references and RF bias rails |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring circuits |
| Shutdown Current | 0.1µA - enables deep-sleep modes in IoT edge nodes |
Pinout & Package
SOT-23-5 package: 2.9mm × 2.8mm × 1.3mm body, surface-mount, RoHS-compliant, green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Shutdown | Active-high enable input; 1.5–6V logic high enables regulator; 0–0.4V disables with 60Ω VOUT discharge path |
| 2 | GND | Power ground reference for all internal circuitry and feedback loop |
| 3 | VIN | Main input supply (1.8–6V); requires 1µF ceramic capacitor for stability |
| 4 | VOUT | Regulated 1.0V output; supports 1µF ceramic output capacitor; includes internal 60Ω discharge FET |
| 5 | ADJ/NC | No connection for fixed-output version; not internally connected - must be left floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 60µVrms enables clean power for precision analog and RF subsystems without external filtering |
| Low dropout at full load | 800mV dropout at 300mA allows efficient use of marginal input voltages in space-constrained designs |
| Fast soft-start | 50µs ramp time prevents overshoot and reduces stress on downstream capacitive loads |
| Integrated VOUT discharge | 60Ω internal MOSFET discharges output within milliseconds after shutdown - eliminates hold-up voltage issues |
| High PSRR up to 10kHz | 65dB @ 1kHz and 45dB @ 10kHz suppresses noise from buck converter switching frequencies and harmonics |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering ultra-low-power biosignal amplifiers and ADC front-ends in wearable ECG patches. IC Role / Device Role / Timing Role: Primary 1.0V analog supply rail regulator with ultra-low noise and tight voltage tolerance. Use Value: 60µVrms noise avoids signal degradation in sub-µV biomedical measurements; ±2% accuracy ensures consistent ADC reference scaling. |
Use Scenario: Providing isolated 1.0V bias for digital isolator secondary-side logic in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator for isolated digital interface ICs requiring precise low-voltage rail. Use Value: 800mV dropout enables direct regulation from 3.3V isolated DC/DC outputs; 0.1µA shutdown current supports low-power sleep states. |
| Smart Meter MCU Cores | Automotive Body Control Units |
Use Scenario: Supplying 1.0V core voltage to ARM Cortex-M0+ microcontrollers in battery-backed utility meters. IC Role / Device Role / Timing Role: Main system LDO for processor core domain with fast enable/disable sequencing. Use Value: 50µs soft-start synchronizes cleanly with MCU reset timing; 60µA quiescent current extends 10-year battery life. |
Use Scenario: Regulating 1.0V supply for CAN transceiver logic interfaces in door module ECUs. IC Role / Device Role / Timing Role: Dedicated low-noise LDO for CAN controller I/O buffers and level-shifting circuitry. Use Value: 65dB PSRR at 1kHz rejects ignition noise coupling; thermal shutdown at +165°C meets AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1002E/MB | 250mA max output, 1.0V fixed, 6µA quiescent current, no shutdown pin | Lacks active shutdown and VOUT discharge; lower current rating limits use in higher-power peripherals | Select when ultra-low IQ dominates over shutdown control and 300mA capability |
| Torex XC6206P102MR-G | 300mA max, 1.0V fixed, 1.0µA standby, no thermal shutdown, 1.2V min input | Higher minimum input voltage (1.2V vs. 1.8V) and no thermal protection reduce margin in wide-temp industrial use | Prefer for cost-sensitive consumer applications where thermal derating is not required |
Compared with MCP1700T-1002E/MB and XC6206P102MR-G, the AP2129K-1.0TRG1 uniquely combines 300mA drive, active shutdown with VOUT discharge, ±2% accuracy, and thermal protection - making it optimal for industrial and medical applications demanding reliability and feature completeness.
Availability
AP2129K-1.0TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, smart meter MCU cores, industrial PLC I/O modules, and automotive body control units requiring stable component supply and long-term lifecycle support.
Supply support for AP2129K-1.0TRG1 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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The AP2129 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications requiring ultra-low noise, fast transient response, and robust thermal protection.
FAQ
What is the minimum input voltage required for AP2129K-1.0TRG1 to regulate at 1.0V?
The AP2129K-1.0TRG1 requires a minimum input voltage of 1.8V to maintain regulation at 1.0V output. At 300mA load, its 800mV dropout means VIN must be ≥1.8V; below this, output drops linearly with input. This is specified in the Recommended Operating Conditions table (VIN Min = 1.8V).
Can AP2129K-1.0TRG1 be used with ceramic capacitors smaller than 1µF?
No - the device is optimized for 1µF ceramic input and output capacitors, as confirmed in the datasheet's "Compatible with Low ESR Ceramic Capacitor" feature and Typical Applications Circuit. Using smaller values risks instability, poor PSRR, or startup failure due to insufficient phase margin.
Does the ADJ/NC pin on the SOT-23-5 package require termination?
Pin 5 (ADJ/NC) is unconnected internally for the fixed 1.0V version and must be left floating. Grounding or connecting it to any potential violates the pin description and may cause undefined behavior; the datasheet explicitly states it is "No Connection for Fixed Version."
How does the internal VOUT discharge function operate during shutdown?
When the Shutdown pin is driven low (≤0.4V), the internal 60Ω NMOS discharge FET connects VOUT to GND, actively pulling the output voltage to near-zero within ~100µs (calculated from τ = R×C with 1µF). This prevents residual voltage from interfering with downstream logic reset sequencing or causing latch-up.
AP2129K-1.0TRG1 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):
- 1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 300mA (Typ)
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 45dB (100Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2129K-1.0TRG1 FAQ
1.How can I place an order for AP2129K-1.0TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2129K-1.0TRG1 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 AP2129K-1.0TRG1 reliable?
The price and inventory of AP2129K-1.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2129K-1.0TRG1 is usually 5 days.
3.What payment methods are accepted for AP2129K-1.0TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2129K-1.0TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2129K-1.0TRG1?
AP2129K-1.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2129K-1.0TRG1 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 AP2129K-1.0TRG1?
For technical support, including AP2129K-1.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2129K-1.0TRG1 requirements.
6.How does Aetrix verify that AP2129K-1.0TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2129K-1.0TRG1 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 AP2129K-1.0TRG1 meets industry standards.
7.What is the process for return or replacement of AP2129K-1.0TRG1?
All AP2129K-1.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2129K-1.0TRG1, 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 AP2129K-1.0TRG1 part is unused and in its original packaging.
Return procedure for AP2129K-1.0TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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