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Diodes Incorporated AP2125KC-2.8TRE1
- Part No.:
- AP2125KC-2.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-2.8TRE1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
AP2125KC-2.8TRE1 from Diodes Incorporated is a 300mA, fixed-output 2.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, ±2% output voltage accuracy, and 65dB PSRR at 1kHz. It integrates enable control, over-temperature shutdown, and current limiting for use in noise-sensitive battery-powered systems such as GSM/CDMA handsets and portable instrumentation.
For engineers reviewing the AP2125KC-2.8TRE1 datasheet, AP2125KC-2.8TRE1 pinout, AP2125KC-2.8TRE1 application, or AP2125KC-2.8TRE1 equivalent, key selection criteria include ultra-low noise performance, 65mV dropout at 100mA (3.3V version), compatibility with ceramic output capacitors, and active-high enable functionality in a 1.6mm × 1.6mm SC-70-5 footprint.
Technical Context
The AP2125KC-2.8TRE1 employs a CMOS-based error amplifier and precision voltage reference to maintain regulation across input voltages from 3.3V to 6V while delivering up to 300mA. Its internal architecture includes dedicated circuits for over-temperature shutdown (+160°C trip, +25°C hysteresis) and short-circuit protection (50mA limit).
It operates with an active-high CE pin that reduces quiescent current to 0.01µA in shutdown mode and supports stable operation with 1µF ceramic input/output capacitors. The device achieves 65dB power supply rejection at 1kHz and exhibits ±100ppm/°C output voltage temperature coefficient under 30mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable rail for 2.8V logic or analog circuitry without external feedback. |
| Max Output Current | 300mA minimum - sufficient for powering microcontrollers, RF front-ends, or sensor signal chains. |
| Dropout Voltage | 65mV at 100mA (3.3V version); 100mV max at 100mA (2.8V version) - enables operation with minimal headroom from battery sources. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - critical for low-noise analog supplies in audio codecs or ADC references. |
| PSRR | 65dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 60µA typical - extends battery life in always-on portable devices. |
| Standby Current | 0.01µA typical - enables deep-sleep modes with near-zero leakage during system idle. |
| Enable Threshold | CE "High" ≥1.5V, "Low" ≤0.4V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
Pinout & Package
AP2125KC-2.8TRE1 uses the SC-70-5 surface-mount package (1.6mm × 1.6mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are verified per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 3.3V–6V input; requires 1µF ceramic decoupling capacitor close to pin. |
| 2 (GND) | Ground reference | Common return path for input, output, and internal circuits; must be low-impedance. |
| 3 (NC) | No connection | Internally unconnected; left floating or tied to GND per layout best practice. |
| 4 (CE) | Chip enable input | Active-high logic control: ≥1.5V enables regulation; ≤0.4V disables output and reduces IQ to 0.01µA. |
| 5 (VOUT) | Regulated output | Delivers stable 2.8V ±2%; requires 1µF ceramic output capacitor with ESR <1Ω for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 50µVrms (10Hz–100kHz) - eliminates need for post-LDO filtering in sensitive analog rails. |
| Low dropout operation | 65mV at 100mA (3.3V version); enables >95% efficiency from 3.3V Li-ion or 2-cell alkaline inputs. |
| CMOS process architecture | Enables 60µA quiescent current and 0.01µA shutdown - ideal for intermittent-scan IoT sensors. |
| Thermal protection | +160°C shutdown with +25°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| Ceramic capacitor compatibility | Stable with 1µF X5R/X7R ceramics - reduces BOM count and board area vs. tantalum or electrolytic alternatives. |
| High PSRR at audio frequencies | 65dB at 1kHz - effectively attenuates ripple from buck converter switching frequencies and their harmonics. |
Applications
| Mobile Handset Power Rail | GSM/CDMA RF Front-End Supply |
|---|---|
Use Scenario: Providing clean 2.8V bias to baseband processors and display drivers in compact cellular handsets. IC Role / Device Role / Timing Role: Primary low-noise LDO for core logic voltage domain with fast transient response to burst-mode processing loads. Use Value: 50µVrms noise and 65mV dropout preserve signal integrity and extend battery runtime between charges. |
Use Scenario: Delivering regulated 2.8V to power amplifier bias circuits and transceiver ICs in dual-mode GSM/CDMA modules. IC Role / Device Role / Timing Role: Noise-suppressing post-regulator for RF subsystems requiring minimal phase noise contribution. Use Value: 65dB PSRR at 1kHz rejects switching artifacts from PMIC DC/DC stages, improving EVM and ACLR performance. |
| Portable Medical Sensor Node | Handheld Test Instrumentation |
Use Scenario: Supplying precision analog front-end (AFE) and low-power MCU in wearable biosensors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent-current LDO enabling multi-week operation in sleep-wake cycles with sub-µA standby draw. Use Value: 0.01µA shutdown current and ±2% output accuracy ensure reliable AFE calibration and long-term measurement stability. |
Use Scenario: Generating stable 2.8V reference for high-resolution ADCs and DACs in battery-powered multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Ultra-low-noise voltage source for analog signal conditioning paths where SNR directly impacts measurement resolution. Use Value: 50µVrms output noise avoids degrading effective number of bits (ENOB) in 16-bit+ data converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-2802E/TO | 250mA max output, 1.6µA quiescent current, no enable pin, TO-92 package | Lacks CE control and thermal shutdown; suited only for simple always-on rails | Select when board space allows through-hole mounting and enable functionality is unnecessary. |
| Torex XC6206P282MR-G | 300mA output, 1µA quiescent current, no thermal shutdown, SOT-23-3 package | Smaller footprint but missing OTSD and CE; limited fault protection | Choose for ultra-low-IQ applications where thermal safety is managed externally and enable is omitted. |
Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP2125KC-2.8TRE1 uniquely combines 300mA capability, active-high enable, over-temperature shutdown, and 50µVrms noise in a 1.6mm² SC-70-5 package-making it optimal for space-constrained, safety-critical, noise-sensitive portable designs.
Availability
AP2125KC-2.8TRE1 is available at Aetrix Electronics and suitable for GSM/CDMA handset power management, portable medical sensor nodes, and handheld test instrumentation requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for AP2125KC-2.8TRE1 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AP2125 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and robust protection features in miniature packages.
FAQ
What is the minimum input voltage required for AP2125KC-2.8TRE1 to regulate at full 300mA output?
The AP2125KC-2.8TRE1 requires VIN ≥ VOUT + VDROP. At 300mA, dropout is ≤300mV (per DS38144, p.6), so minimum input is 3.1V. For guaranteed 300mA operation across temperature, VIN ≥ 3.3V is recommended. Below this, output current capability decreases progressively.
Can AP2125KC-2.8TRE1 be used with a 0.47µF output capacitor instead of the specified 1µF?
No. Diodes specifies 1µF ceramic (X5R/X7R) for stability across all operating conditions. Using 0.47µF risks oscillation due to insufficient phase margin, especially under load transients or elevated temperature. The 1µF value is validated for ESR <1Ω and ensures monotonic step response per Figure 22 in DS38144.
Does the NC pin (Pin 3) require any PCB layout treatment?
Pin 3 is internally unconnected and must not be soldered to any net. It may be left floating or tied to GND using a non-functional copper pour to improve thermal conduction-provided no electrical connection is made. Do not route signals or power traces beneath or adjacent to this pin.
How does the CE pin behave during power-up when VIN ramps slowly?
The CE pin has no internal pull-up or pull-down. If left floating during power-up, undefined logic states may cause erratic enable/disable behavior. Diodes recommends tying CE to VIN via a 100kΩ resistor or to a controlled GPIO to ensure deterministic startup-either fully enabled or held off until system initialization completes.
AP2125KC-2.8TRE1 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):
- 2.8V
- 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-2.8TRE1 FAQ
1.How can I place an order for AP2125KC-2.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-2.8TRE1 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-2.8TRE1 reliable?
The price and inventory of AP2125KC-2.8TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-2.8TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-2.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-2.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-2.8TRE1?
AP2125KC-2.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-2.8TRE1 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-2.8TRE1?
For technical support, including AP2125KC-2.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-2.8TRE1 requirements.
6.How does Aetrix verify that AP2125KC-2.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-2.8TRE1 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-2.8TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-2.8TRE1?
All AP2125KC-2.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-2.8TRE1, 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-2.8TRE1 part is unused and in its original packaging.
Return procedure for AP2125KC-2.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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