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Diodes Incorporated AP2125KC-2.8TRG1
- Part No.:
- AP2125KC-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
AP2125KC-2.8TRG1 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 65mV dropout at 100mA - designed for power-sensitive RF and analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2125KC-2.8TRG1 datasheet, AP2125KC-2.8TRG1 pinout, AP2125KC-2.8TRG1 application, or AP2125KC-2.8TRG1 equivalent, key selection criteria include ultra-low noise performance, enable-controlled shutdown with 0.01µA standby current, compatibility with ceramic capacitors, and thermal shutdown at +160°C.
Technical Context
The AP2125KC-2.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, active-high CE control, overcurrent protection, and overtemperature shutdown (OTSD). Its CMOS architecture enables low quiescent current (60µA typical) and stable regulation under light-load conditions.
It operates across -40°C to +85°C ambient, supports input voltages from (VOUT + 0.5)V up to 6V, and maintains load regulation within ±15mV across 1–300mA output current - critical for maintaining signal integrity in noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for 2.8V logic, RF front-ends, or sensor interfaces without external feedback. |
| Max Output Current | 300mA minimum - sufficient to power baseband processors, PMIC rails, or multi-sensor modules in handheld devices. |
| Dropout Voltage | 65mV at 100mA - enables operation from single-cell Li-ion (3.0–3.6V) with >2.9V headroom, minimizing power loss. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - preserves SNR in audio codecs, ADC references, and RF synthesizer VCO supplies. |
| 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 monitoring circuits and low-power sleep modes. |
| Standby Current | 0.01µA typical with CE = low - enables deep-sleep power gating for system-level energy optimization. |
| Thermal Shutdown | +160°C with +25°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
AP2125KC-2.8TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for space-constrained portable designs. Pinout is validated per Diodes DS38144 Rev. 2–2 (May 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 3.3–6V input; requires ≥1µF ceramic input capacitor for stability and transient response. |
| 2 (GND) | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 3 (CE) | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.4V disables output and reduces current to 0.01µA. |
| 4 (NC) | No connection | Internally unconnected; must remain floating - no external tie or pull-up/down required. |
| 5 (VOUT) | Regulated output | Delivers 2.8V ±2% to load; requires ≥1µF ceramic output capacitor with ESR <1Ω for stability per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 50µVrms enables clean power for RF VCOs, high-resolution ADCs, and audio amplifiers without additional filtering. |
| High PSRR at 1kHz | 65dB rejection of ripple from switching regulators allows co-location with DC/DC converters on compact PCBs. |
| Low dropout at full load | 200mV at 300mA ensures usable output from depleting Li-ion cells down to ~3.0V while sustaining rated current. |
| Ceramic capacitor compatible | Stable with 1µF input/output ceramics - eliminates need for larger, costlier tantalum or aluminum electrolytics. |
| Thermal and current protection | Integrated OTSD and short-circuit current limit (50mA) prevent damage during fault conditions without external components. |
| Green RoHS/Green package | Halogen- and antimony-free, lead-free SC-70-5 meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). |
Applications
| CDMA/GSM Handset Power Rails | Laptop Baseband Subsystem |
|---|---|
|
Use Scenario: Providing clean 2.8V supply to GSM transceiver PA bias and RF front-end ICs in dual-mode handsets. IC Role / Device Role / Timing Role: Primary low-noise post-regulator for RF signal chain, decoupling noisy DC/DC outputs. Use Value: 50µVrms noise prevents reciprocal mixing and adjacent-channel interference, directly improving receiver sensitivity. |
Use Scenario: Powering 2.8V I/O banks and memory interfaces in laptop chipset companion ICs. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast load transient response for burst-mode data transfers. Use Value: 65mV dropout and ±2% accuracy maintain timing margin compliance for DDR I/O and PCIe SerDes reference rails. |
| Hand-Held Medical Sensors | PCMCIA Card Analog Front-End |
|
Use Scenario: Supplying 2.8V to low-power biosignal amplifiers and 24-bit delta-sigma ADCs in portable ECG monitors. IC Role / Device Role / Timing Role: Precision analog rail generator with minimal thermal drift (±100ppm/°C). Use Value: Low 60µA quiescent current extends battery runtime in Class II medical devices requiring >72-hour operation. |
Use Scenario: Regulating 2.8V for analog signal conditioning and multiplexer control in legacy PCMCIA data acquisition cards. IC Role / Device Role / Timing Role: Compact, enable-controlled power source supporting hot-plug insertion and system-level power sequencing. Use Value: 0.01µA shutdown current meets PCMCIA 2.1 specification for card idle-state leakage limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/MB | 250mA max output, 175mV dropout at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; lower current capacity limits use in higher-power RF stages | Select when board space is constrained to 3-pin footprint and enable control is handled externally |
| Torex XC6206P282MR-G | 300mA max, 150mV dropout at 100mA, 40µVrms noise, SOT-23-5 package, no CE pin | Fixed ON-only operation; no shutdown mode - unsuitable for systems requiring dynamic power gating | Prefer where lowest possible noise is critical and system-level enable is implemented upstream |
Compared with MCP1700T-2802E/MB and XC6206P282MR-G, AP2125KC-2.8TRG1 uniquely combines 300mA capability, active-high enable, thermal shutdown, and 50µVrms noise in SC-70-5 - making it optimal for space-limited, battery-powered RF and precision analog systems requiring both performance and protection.
Availability
AP2125KC-2.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable medical instrumentation, laptop baseband subsystems, and PCMCIA-based data acquisition requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP2125KC-2.8TRG1 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-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP2125 series belongs to Diodes' precision LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current operation in battery-powered portable electronics - emphasizing RF immunity, thermal robustness, and ceramic capacitor compatibility.
FAQ
What is the minimum input voltage required for AP2125KC-2.8TRG1 to regulate at 2.8V?
The AP2125KC-2.8TRG1 requires VIN ≥ (VOUT + 0.5V) = 3.3V for guaranteed regulation across temperature and load, per Recommended Operating Conditions. At 100mA load, dropout is 65mV, so 2.865V input would theoretically sustain regulation - but 3.3V is the specified minimum to ensure stability and PSRR performance over -40°C to +85°C.
Can AP2125KC-2.8TRG1 be used with a 0.47µF output capacitor?
No - the datasheet specifies ≥1µF ceramic output capacitance for stability. Using 0.47µF violates the minimum COUT requirement and risks oscillation or poor transient response, especially under load steps. The 1µF value is validated for ESR <1Ω and ensures phase margin >45° across operating conditions.
Does AP2125KC-2.8TRG1 support reverse current blocking?
No - the AP2125KC-2.8TRG1 does not integrate reverse current blocking. If VOUT exceeds VIN (e.g., during hot-swap or backup battery scenarios), current can flow backward from output to input through the internal pass device. An external Schottky diode or ideal diode controller is required for reverse polarity or backfeed protection.
Is the SC-70-5 package of AP2125KC-2.8TRG1 compatible with standard reflow profiles?
Yes - the SC-70-5 package is MSL1 (moisture sensitivity level 1) and rated for peak reflow temperatures up to +260°C for 10 seconds. It complies with IPC/JEDEC J-STD-020D and supports standard lead-free reflow profiles including JEDEC Level 3, provided board layout provides adequate thermal relief to avoid localized overheating.
AP2125KC-2.8TRG1 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):
- 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-2.8TRG1 FAQ
1.How can I place an order for AP2125KC-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-2.8TRG1 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-2.8TRG1 reliable?
The price and inventory of AP2125KC-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KC-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-2.8TRG1?
AP2125KC-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-2.8TRG1 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-2.8TRG1?
For technical support, including AP2125KC-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-2.8TRG1 requirements.
6.How does Aetrix verify that AP2125KC-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-2.8TRG1 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-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-2.8TRG1?
All AP2125KC-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-2.8TRG1, 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-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125KC-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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