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Diodes Incorporated AP2125KS-2.5TRG1
- Part No.:
- AP2125KS-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
AP2125KS-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
AP2125KS-2.5TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.5V 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 powering noise-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2125KS-2.5TRG1 datasheet, AP2125KS-2.5TRG1 pinout, AP2125KS-2.5TRG1 application, or AP2125KS-2.5TRG1 equivalent, key selection criteria include ultra-low noise performance, enable-controlled shutdown with 0.01µA standby current, compatibility with low-ESR ceramic capacitors, and thermal shutdown protection at +160°C.
Technical Context
The AP2125KS-2.5TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.5V output, active-high enable (CE) logic interface, current-limit circuitry, and over-temperature shutdown (OTSD). Its CMOS architecture enables low quiescent current (60µA typical) and stable operation with 1µF input/output ceramic capacitors.
It operates across -40°C to +85°C ambient temperature, supports input voltages from (VOUT + 0.5)V up to 6V, and maintains load regulation within ±15mV over 1–300mA output current - critical for maintaining signal integrity in RF front-ends and precision ADC/DAC biasing rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable bias for 2.5V-tolerant analog ICs without external feedback. |
| Max Output Current | 300mA minimum - sufficient to power multiple low-power sensors or microcontroller peripherals. |
| Dropout Voltage | 65mV at 100mA - enables regulation from 2.55V input, extending battery runtime in single-cell Li-ion or 3-cell alkaline systems. |
| Output Noise | 50µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and quantization error in high-resolution ADCs. |
| PSRR | 65dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 60µA typical - preserves battery life during system sleep modes with enabled regulator. |
| Standby Current | 0.01µA typical - reduces leakage to negligible levels when CE pin is held low. |
Pinout & Package
AP2125KS-2.5TRG1 uses the SC-70-5 surface-mount package (1.6mm × 1.6mm × 0.9mm), optimized for space-constrained portable designs. Pinout is validated per Diodes DS38144 Rev. 2–2, Figure 1 (SC-70-5 top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply connection; accepts 3.0V to 6V, must be ≥ VOUT + 0.5V for regulation. |
| 2 | GND | Power ground reference; requires low-impedance PCB return path for noise control. |
| 3 | NC | No internal connection; left unconnected per datasheet - not to be tied to any net. |
| 4 | CE | Active-high enable; >1.5V enables regulation, <0.4V forces shutdown with 0.01µA ISTD. |
| 5 | VOUT | Regulated 2.5V output; requires 1µF ceramic capacitor (X5R/X7R) placed ≤2mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 50µVrms enables clean power for RF synthesizers and audio codecs without additional filtering. |
| Enable-controlled shutdown | 0.01µA standby current allows host MCU to gate power to subsystems with µA-level system sleep budgets. |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R MLCCs on input and output - eliminates need for larger, less reliable tantalum caps. |
| Over-temperature protection | Thermal shutdown at +160°C with +25°C hysteresis prevents permanent damage during sustained overload or poor PCB heatsinking. |
| High PSRR at 1kHz | 65dB rejection of 1kHz ripple - critical for suppressing beat frequencies between switching regulators and sensitive analog stages. |
Applications
| RF Front-End Power | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Powers low-noise amplifiers (LNAs) and mixers in GSM/CDMA handset transceivers where supply ripple directly modulates RF carrier. IC Role / Device Role / Timing Role: Primary 2.5V analog rail regulator with ultra-low noise and fast transient response to maintain EVM and ACLR specs. Use Value: 50µVrms noise and 65dB PSRR prevent baseband interference from PMU switching noise, ensuring compliant RF performance. | Use Scenario: Supplies bias voltage to precision biosignal amplifiers (ECG/EEG) in handheld diagnostic devices operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent, enable-controlled LDO delivering stable 2.5V reference for 24-bit delta-sigma ADCs. Use Value: 60µA IQ and 0.01µA ISTD extend single-CR2032 battery life to >12 months in intermittent-use clinical applications. |
| Wearable Motion Sensor Hub | Industrial Handheld Data Logger |
Use Scenario: Powers MEMS accelerometer/gyroscope ASICs and their integrated signal-conditioning circuitry in compact fitness trackers. IC Role / Device Role / Timing Role: Compact SC-70-5 LDO providing regulated 2.5V to mixed-signal sensor interface with minimal board area. Use Value: SC-70-5 footprint (1.6×1.6mm) and 300mA capability support multi-sensor integration without thermal derating in sealed enclosures. | Use Scenario: Delivers clean 2.5V supply to isolated RS-485 transceivers and precision temperature sensor front-ends in field-deployed data loggers. IC Role / Device Role / Timing Role: Input-referred LDO with 6V max VIN tolerating automotive-grade 12V supply transients via external pre-regulator. Use Value: 6V absolute max VIN and ±2% output accuracy ensure reliable operation across wide industrial input ranges and temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | 250mA max output, 175mV dropout at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin; fixed ON-state only - unsuitable for dynamic power gating | Select when enable functionality is unnecessary and board space permits SOT-23-3; verify 250mA limit against peak load. |
| Torex XC6206P252MR-G | 300mA max, 150mV dropout at 100mA, 40µVrms noise, SOT-25 package (5-pin) | CE pin is active-low; different pinout requires PCB redesign | Choose for lower noise if active-low control aligns with system logic; confirm thermal resistance (θJA=300°C/W) matches layout constraints. |
Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the AP2125KS-2.5TRG1 uniquely combines 300mA capability, active-high CE, SC-70-5 footprint, and 65mV dropout - making it optimal for space-limited, battery-powered systems requiring both low noise and intelligent power sequencing.
Availability
AP2125KS-2.5TRG1 is available at Aetrix Electronics and suitable for portable medical devices, RF front-ends, wearable sensor hubs, and industrial handheld data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP2125KS-2.5TRG1 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, industrial, and communications markets.
The AP2125 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and minimal quiescent current.
FAQ
What is the minimum input voltage required for regulation at 2.5V output?
The AP2125KS-2.5TRG1 requires VIN ≥ VOUT + 0.5V = 3.0V for guaranteed regulation across temperature and load. At 100mA output, dropout is 65mV, so 2.565V input would theoretically sustain regulation - but the datasheet specifies 3.0V minimum under recommended operating conditions to ensure stability and accuracy over -40°C to +85°C.
Can AP2125KS-2.5TRG1 be used with 0.47µF output capacitors?
No - the datasheet specifies 1µF minimum ceramic output capacitance (X5R/X7R) for stability. Using 0.47µF violates the minimum COUT requirement and may cause oscillation or degraded transient response, especially under load steps. The 1µF value is validated for phase margin >45° across all operating conditions.
Does the NC pin (Pin 3) require PCB routing or grounding?
No - Pin 3 is explicitly designated "No Connection" in the datasheet and has no internal bond wire or circuit connection. It must remain unconnected on the PCB; routing or grounding this pin may compromise thermal performance or introduce unintended coupling paths.
How does thermal shutdown behave during continuous overload?
When junction temperature reaches +160°C, the AP2125KS-2.5TRG1 disables output and enters thermal shutdown. It remains off until temperature drops by +25°C hysteresis (to ~+135°C), then automatically resumes regulation - preventing latch-up while allowing safe cooldown without manual reset.
AP2125KS-2.5TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 2.5V
- 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-70-5
AP2125KS-2.5TRG1 FAQ
1.How can I place an order for AP2125KS-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KS-2.5TRG1 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 AP2125KS-2.5TRG1 reliable?
The price and inventory of AP2125KS-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KS-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KS-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KS-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KS-2.5TRG1?
AP2125KS-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KS-2.5TRG1 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 AP2125KS-2.5TRG1?
For technical support, including AP2125KS-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KS-2.5TRG1 requirements.
6.How does Aetrix verify that AP2125KS-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KS-2.5TRG1 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 AP2125KS-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KS-2.5TRG1?
All AP2125KS-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KS-2.5TRG1, 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 AP2125KS-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2125KS-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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