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Diodes Incorporated AP2125K-3.0TRG1
- Part No.:
- AP2125K-3.0TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2125K-3.0TRG1.pdf
- Description:
- IC REG LINEAR 3V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,839
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Product details
Overview
AP2125K-3.0TRG1 from Diodes Incorporated is a 300mA, fixed-output 3.0V 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 and current limiting, and is optimized for battery-powered portable electronics requiring stable, ultra-low-noise supply rails.
For engineers reviewing the AP2125K-3.0TRG1 datasheet, AP2125K-3.0TRG1 pinout, AP2125K-3.0TRG1 application, or AP2125K-3.0TRG1 equivalent, key selection criteria include dropout performance under 100mA load, RMS noise specification for RF/analog circuitry, enable input logic thresholds, thermal shutdown behavior, and compatibility with 1µF ceramic output capacitors.
Technical Context
The AP2125K-3.0TRG1 employs a CMOS-based error amplifier architecture with internal voltage reference and resistor network to maintain regulated 3.0V output across input voltages from 3.5V to 6.0V. Its active-high CE pin enables precise power sequencing control, while the integrated OTSD circuit triggers shutdown at +160°C junction temperature with +25°C hysteresis.
Designed for high PSRR (65dB typical at 1kHz), low quiescent current (60µA typical), and compatibility with low-ESR ceramic capacitors, the device delivers stable regulation under fast load transients (10–100mA step) and line variations (4.0V to 5.0V input swing), making it suitable for noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±2% - Ensures consistent biasing for 3.3V-tolerant I/O or 3.0V core logic without external trimming. |
| Max Output Current | 300mA min - Supports moderate-power microcontrollers, sensors, or RF front-end ICs in compact portable designs. |
| Dropout Voltage | 65mV @ 100mA - Enables operation from single-cell Li-ion (3.0–4.2V) or two-cell alkaline (3.0V nominal) with minimal headroom loss. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - Minimizes phase noise in VCOs, jitter in ADC clocks, and ripple in audio amplifiers. |
| Quiescent Current | 60µA typical - Extends battery life in always-on monitoring circuits or sleep-mode peripherals. |
| PSRR | 65dB @ 1kHz - Suppresses switching noise from DC/DC converters feeding the LDO input rail. |
| Enable Threshold | VCE(HI) = 1.5V min, VCE(LO) = 0.4V max - Compatible with 1.8V/3.3V GPIOs for clean on/off control without level shifters. |
Pinout & Package
AP2125K-3.0TRG1 is housed in a 5-pin SC-70-5 surface-mount package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained portable applications. Pin assignments are validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin; accepts 3.5V–6.0V; requires 1µF ceramic decoupling capacitor. |
| 2 | GND | Analog/digital ground reference; must be connected to low-impedance PCB ground plane. |
| 3 | NC | No internal connection; left unconnected per datasheet; not electrically tied to any internal node. |
| 4 | CE | Active-high enable input; logic high ≥1.5V enables regulation; logic low ≤0.4V places device in 0.01µA shutdown mode. |
| 5 | VOUT | Regulated 3.0V output; supports 1µF ceramic capacitor; ESR stability range defined in datasheet Figure 15. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for RF receivers, precision ADCs, and low-jitter clock buffers. |
| Sub-100mV dropout at 100mA | 65mV dropout preserves >97% of input voltage margin, critical for extending runtime in single-cell battery systems. |
| 0.01µA shutdown current | Enables multi-year shelf life in IoT endpoint devices with infrequent wake-up cycles and deep-sleep firmware states. |
| ±2% output accuracy over temp | Guarantees stable 3.0V supply across –40°C to +85°C ambient, eliminating need for post-regulation calibration. |
| Integrated thermal protection | +160°C shutdown with +25°C hysteresis prevents latch-up during sustained overload or poor PCB thermal design. |
Applications
| CDMA/GSM Handsets | Laptops & Notebooks |
|---|---|
Use Scenario: Powering RF transceiver bias rails and baseband processor I/O domains in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Primary low-noise LDO supplying 3.0V to GSM PA driver stages and ADC reference inputs. Use Value: 50µVrms noise prevents reciprocal mixing and maintains EVM <2.5% in 8PSK transmission. |
Use Scenario: Regulating auxiliary 3.0V rails for USB controller PHYs, touchpad interfaces, and embedded security modules. IC Role / Device Role / Timing Role: Secondary LDO delivering stable 3.0V from main 5V buck converter output. Use Value: 65mV dropout ensures uninterrupted operation during 5V rail sag under CPU burst loads. |
| Hand-held Instruments | PCMCIA Cards |
Use Scenario: Supplying precision analog front-ends in portable multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Low-drift LDO powering 24-bit sigma-delta ADC reference and op-amp bias networks. Use Value: ±2% output accuracy and ±100ppm/°C TC ensure <0.1% full-scale error across operating temperature range. |
Use Scenario: Providing isolated 3.0V power to PCMCIA card controllers and SRAM buffers in legacy industrial laptops. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling hot-plug power sequencing and safe card insertion detection. Use Value: CE pin logic thresholds match 3.3V GPIO levels, allowing direct interface without external level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3002E/TO | 250mA max output, 175mV dropout @ 250mA, 30µVrms noise, SOT-23-3 package | Limited to lower-current analog sensors; lacks enable pin and thermal shutdown | Select when board space is constrained and enable/control functionality is unnecessary. |
| Torex XC6206P302MR-G | 300mA max, 150mV dropout @ 100mA, 40µVrms noise, SOT-23-5 package, no CE pin | Fixed-on operation only; higher dropout reduces usable battery voltage range | Choose for cost-sensitive designs where enable control and ultra-low dropout are non-critical. |
Compared with MCP1700-3002E/TO and XC6206P302MR-G, AP2125K-3.0TRG1 provides superior dropout performance (65mV vs. ≥150mV), integrated enable control, and robust thermal protection-making it the preferred choice for battery-powered systems demanding extended runtime and reliable fault handling.
Availability
AP2125K-3.0TRG1 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 AP2125K-3.0TRG1 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The AP2125 series belongs to Diodes' precision LDO portfolio, designed specifically for ultra-low-noise, low-quiescent-current regulation in space- and power-constrained portable electronics.
FAQ
What is the minimum input voltage required for AP2125K-3.0TRG1 to maintain regulation?
The AP2125K-3.0TRG1 requires VIN ≥ VOUT + 0.5V = 3.5V under recommended operating conditions. At 100mA load, its 65mV dropout allows regulation down to 3.065V input, but datasheet-specified minimum is 3.5V to guarantee ±2% accuracy and PSRR performance across temperature.
Can AP2125K-3.0TRG1 operate with a 1µF ceramic output capacitor?
Yes-AP2125K-3.0TRG1 is explicitly characterized and stabilized with 1µF ceramic capacitors (X5R/X7R, ≤100mΩ ESR). Datasheet Figure 15 confirms stable operation across 0–300mA output current with this value, eliminating need for larger or electrolytic alternatives.
Does AP2125K-3.0TRG1 support reverse current blocking?
No-the AP2125K-3.0TRG1 does not integrate reverse current blocking. When VIN < VOUT, reverse current can flow from VOUT to VIN through the internal pass transistor. External reverse-blocking diode or MOSFET is required if backfeed prevention is needed in multi-rail systems.
What is the thermal resistance (θJA) of the SC-70-5 package?
The SC-70-5 package has θJA = 300°C/W (per DS38144 Rev. 2–2, page 3). With 300mA load and 65mV dropout, power dissipation is ~19.5mW, resulting in ~5.9°C junction-to-ambient rise above ambient-well within safe limits for standard 2-layer PCB layouts without copper pour.
AP2125K-3.0TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 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:
- SOT-23-5
AP2125K-3.0TRG1 FAQ
1.How can I place an order for AP2125K-3.0TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125K-3.0TRG1 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 AP2125K-3.0TRG1 reliable?
The price and inventory of AP2125K-3.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125K-3.0TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125K-3.0TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125K-3.0TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125K-3.0TRG1?
AP2125K-3.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125K-3.0TRG1 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 AP2125K-3.0TRG1?
For technical support, including AP2125K-3.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125K-3.0TRG1 requirements.
6.How does Aetrix verify that AP2125K-3.0TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125K-3.0TRG1 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 AP2125K-3.0TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125K-3.0TRG1?
All AP2125K-3.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125K-3.0TRG1, 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 AP2125K-3.0TRG1 part is unused and in its original packaging.
Return procedure for AP2125K-3.0TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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