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Diodes Incorporated AP2125KC-3.3TRE1
- Part No.:
- AP2125KC-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:2,902
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Product details
Overview
AP2125KC-3.3TRE1 from Diodes Incorporated is a 300mA, fixed-output 3.3V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 65mV dropout at 100mA, ±2% output voltage accuracy, 50µVrms output noise, and 0.01µA standby current. It integrates over-temperature shutdown, current limiting, and active-high enable control-designed for power-sensitive RF and digital subsystems in portable electronics.
For engineers reviewing the AP2125KC-3.3TRE1 datasheet, AP2125KC-3.3TRE1 pinout, AP2125KC-3.3TRE1 application, or AP2125KC-3.3TRE1 equivalent, key selection criteria include ultra-low noise performance for analog/RF rails, sub-100mV dropout under load, compatibility with 1µF ceramic output capacitors, and thermal shutdown behavior at +160°C junction temperature.
Technical Context
The AP2125KC-3.3TRE1 employs a CMOS-based error amplifier architecture with internal voltage reference and resistor network for precise 3.3V regulation. Its enable circuit supports logic-level control (VCE(HI) ≥ 1.5V, VCE(LO) ≤ 0.4V), and the integrated OTSD circuit triggers at +160°C with +25°C hysteresis.
Designed for battery-powered systems, it delivers stable regulation across –40°C to +85°C ambient, maintains ≤15mV load regulation (1–300mA), and achieves 65dB PSRR at 1kHz-enabling clean supply for ADCs, PLLs, and RF front-ends without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures reliable operation of 3.3V logic and interface ICs without margin risk |
| Max Output Current | 300mA min - sufficient for powering microcontrollers, sensors, or RF transceivers in compact devices |
| Dropout Voltage | 65mV @ 100mA - enables regulation from 3.365V input, extending battery runtime in single-cell Li-ion or 2xAA systems |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - minimizes phase jitter in clock-sensitive circuits and noise coupling into analog signal paths |
| Quiescent Current | 60µA typical - preserves battery life during active operation while maintaining fast wake-up response |
| Standby Current | 0.01µA typical - reduces leakage to negligible levels during system sleep or shutdown modes |
| PSRR | 65dB @ 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input rail |
| Thermal Shutdown | +160°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
Pinout & Package
AP2125KC-3.3TRE1 is housed in a 5-pin SC-70-5 package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.8V–6V for 3.3V output (VIN ≥ VOUT + 0.5V) |
| 2 | GND | Analog/digital ground reference; must be low-impedance and co-located with output capacitor |
| 3 | NC | No internal connection; electrically isolated and may be left unconnected or tied to GND for mechanical stability |
| 4 | CE | Active-high enable input; drives device ON when ≥1.5V, OFF when ≤0.4V; supports system-level power sequencing |
| 5 | VOUT | Regulated 3.3V output; requires ≥1µF low-ESR ceramic capacitor for stability per datasheet guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables direct powering of RF receivers and precision ADCs without post-regulation filtering |
| CMOS process architecture | Enables 0.01µA shutdown current and eliminates PNP pass transistor leakage issues common in bipolar LDOs |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics (ESR < 1Ω), eliminating need for costly tantalum or aluminum electrolytics |
| High PSRR at audio frequencies | 65dB rejection at 1kHz suppresses ripple from buck converter switching edges that fall within sensitive audio bands |
| Integrated protection | Combines current limit (50mA short-circuit), thermal shutdown (+160°C), and safe enable logic-reducing BOM count vs. discrete protection |
Applications
| CDMA/GSM Cellular Handsets | Laptops & Notebook Computers |
|---|---|
Use Scenario: Powering RF transceiver ICs and baseband processors requiring ultra-clean 3.3V supply. IC Role / Device Role / Timing Role: Primary low-noise voltage regulator for analog front-end and clock distribution circuitry. Use Value: 50µVrms noise prevents reciprocal mixing and EVM degradation in LTE/WCDMA transmit paths. |
Use Scenario: Supplying USB controller, touchpad, and embedded controller (EC) rails in ultraportable platforms. IC Role / Device Role / Timing Role: Secondary LDO delivering tightly regulated 3.3V from main PMIC output. Use Value: 65mV dropout extends usable battery range by enabling regulation down to 3.365V input voltage. |
| Hand-held Instruments | PCMCIA Cards |
Use Scenario: Providing precision analog supply for 16-bit ADCs and op-amp signal chains in portable DMMs and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise analog domain regulator decoupled from digital switching noise sources. Use Value: ±2% output accuracy and <±100ppm/°C drift ensure measurement repeatability across operating temperature range. |
Use Scenario: Generating 3.3V I/O supply for PC Card interface logic compliant with JEDEC JESD122. IC Role / Device Role / Timing Role: Standalone enable-controlled regulator supporting hot-plug insertion and removal sequences. Use Value: 0.01µA standby current meets PCMCIA Type II power-down requirements during card ejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 250mA max output, 175mV dropout @ 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; suited for simpler, lower-current non-critical rails | Select when board space is constrained to 3-pin footprint and full protection is not required |
| Torex XC6206P332MR-G | 300mA max, 150mV dropout @ 100mA, 40µVrms noise, SOT-23-5 package, no CE pin | Fixed-on operation only; no enable control or thermal shutdown; slightly lower noise but higher dropout | Choose for cost-sensitive designs where always-on operation and minimal noise are prioritized over programmability |
Compared with MCP1700-3302E/TO and XC6206P332MR-G, AP2125KC-3.3TRE1 uniquely combines 300mA capability, ultra-low 65mV dropout, active enable, and thermal protection in a 5-pin SC-70 package-making it optimal for thermally demanding, battery-operated systems requiring both efficiency and robustness.
Availability
AP2125KC-3.3TRE1 is available at Aetrix Electronics and suitable for CDMA/GSM handsets, handheld instruments, laptops, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP2125KC-3.3TRE1 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 power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The AP2125 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered portable electronics where low noise, low quiescent current, and small-footprint packaging are critical design constraints.
FAQ
What is the minimum input voltage required for stable 3.3V output?
The AP2125KC-3.3TRE1 requires VIN ≥ VOUT + 0.5V per recommended operating conditions, meaning a minimum of 3.8V input for full 300mA load across –40°C to +85°C. At 100mA, dropout is 65mV, so 3.365V input sustains regulation-but 3.8V is the guaranteed operational floor.
Can AP2125KC-3.3TRE1 operate with a 1µF ceramic output capacitor?
Yes-datasheet Figure 15 confirms stable operation with 1µF X5R/X7R ceramic capacitors (ESR < 1Ω). No minimum ESR requirement exists, unlike many older LDOs; this eliminates need for bulkier or higher-ESR alternatives and simplifies layout.
How does the CE pin behave during power-up and sequencing?
The CE pin is active-high with VIH ≥ 1.5V and VIL ≤ 0.4V. When CE rises above 1.5V, VOUT reaches regulation in ≤50µs (typical); when CE falls below 0.4V, VOUT discharges through internal 120Ω pulldown, achieving <0.1V in ~100µs with 1µF COUT-supporting controlled power-down sequencing.
Is AP2125KC-3.3TRE1 compatible with lead-free reflow profiles?
Yes-AP2125KC-3.3TRE1 is fully RoHS-compliant and rated for lead-free soldering at 260°C peak temperature (10 seconds), per JEDEC J-STD-020. The SC-70-5 package has been qualified for standard Pb-free reflow cycles without delamination or parametric shift.
AP2125KC-3.3TRE1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB (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-3.3TRE1 FAQ
1.How can I place an order for AP2125KC-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-3.3TRE1 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-3.3TRE1 reliable?
The price and inventory of AP2125KC-3.3TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-3.3TRE1?
AP2125KC-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-3.3TRE1 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-3.3TRE1?
For technical support, including AP2125KC-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-3.3TRE1 requirements.
6.How does Aetrix verify that AP2125KC-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-3.3TRE1 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-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-3.3TRE1?
All AP2125KC-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-3.3TRE1, 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-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP2125KC-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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