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Diodes Incorporated AP2125KC-1.8TRG1
- Part No.:
- AP2125KC-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
AP2125KC-1.8TRG1 from Diodes Incorporated is a 300mA, fixed-output 1.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, 70dB PSRR at 100Hz/1kHz, ±2% output voltage accuracy, and 60µA typical quiescent current. It delivers stable power to noise-sensitive analog circuits in space-constrained portable electronics.
For engineers reviewing the AP2125KC-1.8TRG1 datasheet, AP2125KC-1.8TRG1 pinout, AP2125KC-1.8TRG1 application, or AP2125KC-1.8TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, enable-controlled shutdown with 0.01µA standby current, and ceramic capacitor support without external compensation.
Technical Context
The AP2125KC-1.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, active-high enable (CE) logic, overcurrent protection, and thermal shutdown circuitry. Its CMOS architecture enables low dropout (10mV typ. at 10mA), high PSRR, and minimal load/line regulation drift.
Designed for battery-powered systems, it operates from VIN = VOUT + 0.5V to 6V across –40°C to +85°C ambient, supports 1µF input/output ceramic capacitors, and maintains output stability under rapid load transients up to 300mA with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (ensures stable core voltage for 1.8V logic and RF ICs) |
| Max Output Current | 300mA minimum (supports moderate-power microcontrollers and sensors) |
| Dropout Voltage | 10mV typical at 10mA (enables operation with minimal headroom, e.g., single Li-ion cell) |
| RMS Output Noise | 50µVrms (10Hz–100kHz) (critical for ADC references and RF front-end biasing) |
| PSRR | 70dB typical at 100Hz/1kHz (rejects switching noise from upstream DC/DC converters) |
| Quiescent Current | 60µA typical (extends battery life in always-on monitoring applications) |
| Standby Current | 0.01µA typical (enables deep-sleep mode with CE pin deasserted) |
| Thermal Shutdown | Activates at +160°C with +25°C hysteresis (prevents permanent damage during overload) |
Pinout & Package
AP2125KC-1.8TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply connection; accepts 2.3V to 6V, must be decoupled with ≥1µF ceramic capacitor |
| 2 | GND | Analog ground reference; requires low-impedance connection to system ground plane |
| 3 | NC | No internal connection; left unconnected per design (not used in SC-70-5 variant) |
| 4 | CE | Active-high enable input; drives high (>1.5V) to activate regulator, low (<0.4V) to enter 0.01µA shutdown |
| 5 | VOUT | Regulated 1.8V output; requires ≥1µF ceramic capacitor with ESR <1Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for precision ADCs and RF synthesizers |
| High PSRR at audio frequencies | 70dB rejection at 100Hz/1kHz suppresses ripple from buck converter switching artifacts |
| Sub-100mV dropout at full load | 120mV max at 300mA ensures usable output from partially discharged batteries |
| Enable-controlled zero-power state | 0.01µA standby current allows firmware-controlled power gating of peripheral rails |
| Ceramic capacitor compatibility | Stable with 1µF input/output ceramics eliminates need for costly tantalum or electrolytic caps |
| ±2% output accuracy over temp | Guarantees 1.764–1.836V output across –40°C to +85°C for reliable logic-level compliance |
Applications
| CDMA/GSM Handset Power Rail | Laptop Core Logic Supply |
|---|---|
Use Scenario: Powers baseband processor I/O and RF transceiver bias circuits in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Low-noise LDO delivering clean 1.8V to sensitive RF front-end components and digital I/O buffers. Use Value: 50µVrms noise prevents phase noise degradation in local oscillators and maintains EVM performance. | Use Scenario: Supplies 1.8V core voltage to embedded controllers and sensor hubs in ultrabook platforms. IC Role / Device Role / Timing Role: Primary post-regulator for low-power MCU subsystems requiring fast transient response. Use Value: 70dB PSRR isolates digital switching noise from analog sensor signal chains and ADC references. |
| Hand-Held Instrument Reference | PCMCIA Card Interface Rail |
Use Scenario: Provides precision 1.8V reference for 16-bit SAR ADCs and op-amp signal conditioning in portable DMMs. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply rail with tight voltage tolerance for metrology-grade measurements. Use Value: ±2% accuracy and <100ppm/°C tempco ensure measurement repeatability across operating temperature range. | Use Scenario: Generates 1.8V interface voltage for hot-pluggable PCMCIA cards in industrial data acquisition modules. IC Role / Device Role / Timing Role: Enable-controlled power switch enabling safe insertion/removal without system reset. Use Value: 0.01µA shutdown current prevents battery drain when card is absent or inactive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 250mA max output, 17µA quiescent current, 65dB PSRR at 1kHz, SOT-23-3 package | Lacks enable pin and thermal shutdown; lower current rating limits use in higher-load peripherals | Preferred where board space is constrained and enable control is unnecessary |
| Torex XC6206P182MR-G | 300mA max output, 1.0µA standby current, 55dB PSRR at 1kHz, SOT-23-5 package | Higher noise (80µVrms) and lower PSRR reduce suitability for RF/analog applications | Selected when ultra-low standby current outweighs noise/PSRR requirements |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, AP2125KC-1.8TRG1 uniquely balances ultra-low noise, high PSRR, enable functionality, and thermal protection in the smallest SC-70-5 footprint-making it optimal for RF-sensitive, space-constrained, battery-operated designs.
Availability
AP2125KC-1.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset power management, laptop core logic supplies, handheld instrument references, and PCMCIA interface rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AP2125KC-1.8TRG1 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-performance, energy-efficient components for consumer, computing, industrial, and communications markets.
The AP2125 series belongs to Diodes' precision LDO regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal quiescent current in miniature packages.
FAQ
What is the minimum input voltage required for AP2125KC-1.8TRG1 to regulate 1.8V output?
The AP2125KC-1.8TRG1 requires VIN ≥ VOUT + 0.5V = 2.3V for guaranteed regulation across temperature and load. At 10mA load, dropout is only 10mV typ., but the 0.5V margin ensures stable operation under worst-case conditions including line/load regulation and temperature drift.
Can AP2125KC-1.8TRG1 be used with 0.47µF output capacitors?
No-Diodes specifies ≥1µF ceramic output capacitance for stability. Using 0.47µF violates the minimum COUT requirement and risks oscillation or poor transient response, as confirmed by ESR vs. output current plots showing instability below 1µF in the SC-70-5 configuration.
Does AP2125KC-1.8TRG1 support reverse current blocking?
No-the AP2125KC-1.8TRG1 does not integrate reverse current blocking. When VIN < VOUT, reverse current flows from VOUT to VIN through the internal pass device. External protection (e.g., series diode or ideal diode controller) is required in back-powering scenarios.
Is the NC pin on AP2125KC-1.8TRG1 electrically isolated or internally tied?
Pin 3 (NC) in the SC-70-5 package is unconnected internally-no bond wire, no die connection. It must remain floating per datasheet guidance; soldering or routing to any net may compromise reliability or cause unintended leakage paths.
AP2125KC-1.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-82
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.36V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 70db (100Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-82
AP2125KC-1.8TRG1 FAQ
1.How can I place an order for AP2125KC-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-1.8TRG1 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 AP2125KC-1.8TRG1 reliable?
The price and inventory of AP2125KC-1.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-1.8TRG1?
AP2125KC-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-1.8TRG1 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 AP2125KC-1.8TRG1?
For technical support, including AP2125KC-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-1.8TRG1 requirements.
6.How does Aetrix verify that AP2125KC-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-1.8TRG1 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 AP2125KC-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-1.8TRG1?
All AP2125KC-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-1.8TRG1, 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 AP2125KC-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125KC-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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