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Diodes Incorporated AP2125K-1.8TRG1
- Part No.:
- AP2125K-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2125K-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
AP2125K-1.8TRG1 from Diodes Incorporated is a 300mA, fixed-output 1.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, 70dB PSRR at 100Hz/1kHz, ±2% output voltage accuracy, and 60µA typical quiescent current. It delivers stable power to noise-sensitive analog circuits and RF sections in compact battery-powered devices.
For engineers reviewing the AP2125K-1.8TRG1 datasheet, AP2125K-1.8TRG1 pinout, AP2125K-1.8TRG1 application, or AP2125K-1.8TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, enable-controlled shutdown with 0.01µA standby current, and guaranteed 300mA output under 65mV dropout (at 100mA, 3.3V version).
Technical Context
The AP2125K-1.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, active-high CE control, over-current protection, and thermal shutdown (160°C trip with 25°C hysteresis). Its CMOS architecture enables low quiescent current without compromising transient response.
Designed for direct replacement of bipolar LDOs in space-constrained systems, it operates from 2.8V to 6V input while maintaining regulation down to VIN–VOUT = 6.5mV (typ. at 10mA), supports ceramic capacitors ≥1µF on input/output, and exhibits ±100ppm/°C output voltage drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (1.764V–1.836V), enabling direct supply to 1.8V logic cores and RF ICs without external feedback. |
| Max Output Current | 300mA minimum, sufficient for powering microcontrollers, sensors, and wireless transceivers in portable equipment. |
| RMS Output Noise | 50µVrms (10Hz–100kHz), critical for preserving SNR in ADCs, audio codecs, and PLL VCO supplies. |
| PSRR | 70dB typical at 100Hz/1kHz, rejecting switching noise from upstream DC/DC converters. |
| Quiescent Current | 60µA typical, minimizing battery drain during active operation in always-on subsystems. |
| Standby Current | 0.01µA typical when CE = low, supporting multi-week shelf life in IoT endpoint sleep modes. |
| Dropout Voltage | 10mV typical at 10mA load (1.8V version), allowing operation from near-dead batteries or low-headroom sources. |
Pinout & Package
AP2125K-1.8TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for high-density PCB layouts in handheld and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 2.8V–6V, requires ≥1µF ceramic capacitor for stability. |
| 2 | GND | Analog ground reference; must be connected to low-impedance PCB ground plane to maintain noise performance. |
| 3 | NC | No internal connection; left unconnected per datasheet-no routing or soldering required. |
| 4 | CE | Active-high enable input; drives device into 0.01µA shutdown when pulled ≤0.4V; logic-high ≥1.5V enables regulation. |
| 5 | VOUT | Regulated 1.8V output; requires ≥1µF ceramic capacitor with ESR <1Ω for transient stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for RF front-ends and precision analog signal chains. |
| High PSRR across frequency | 70dB rejection at 100Hz/1kHz suppresses ripple from switching regulators feeding the LDO input. |
| Sub-1µA shutdown mode | 0.01µA standby current extends battery life in long-duration sleep states of portable instrumentation. |
| Low-ESR capacitor compatibility | Stable with standard 1µF ceramic capacitors, eliminating need for costly tantalum or polymer alternatives. |
| Thermal protection with hysteresis | 160°C shutdown with 25°C hysteresis prevents latch-up during sustained overload or poor heatsinking. |
Applications
| GNSS Receiver Module | Wearable Health Sensor Hub |
|---|---|
Use Scenario: Powering GPS/Galileo LNA and baseband ICs in size-limited tracking tags. IC Role / Device Role / Timing Role: Primary 1.8V analog supply rail for RF signal chain and ADC reference. Use Value: 50µVrms noise ensures <0.5dB NF degradation in LNA stage; SC-70-5 footprint saves >40% board area vs. SOT-23-5. | Use Scenario: Regulating power to optical heart-rate sensor, accelerometer, and BLE SoC in wrist-worn devices. IC Role / Device Role / Timing Role: Always-on 1.8V supply enabling rapid wake-from-sleep sensor sampling. Use Value: 0.01µA shutdown current allows 3-year coin-cell operation in periodic measurement mode. |
| Industrial Handheld Scanner | Smart Meter Communication Module |
Use Scenario: Supplying image sensor and laser driver in battery-operated barcode scanners. IC Role / Device Role / Timing Role: Low-noise bias source for CMOS image sensor analog front-end. Use Value: ±2% output accuracy maintains consistent pixel response across -40°C to +85°C operating range. | Use Scenario: Powering NB-IoT or LoRa transceiver ICs in utility meter communication boards. IC Role / Device Role / Timing Role: Stable 1.8V rail for RF transceiver digital core and PA bias control. Use Value: 70dB PSRR isolates transceiver from noisy MCU supply, reducing packet error rate by >3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 250mA max output, 17µA quiescent current, no enable pin, SOT-23-3 only | Lacks CE control and 300mA headroom; unsuitable for pulsed-load RF transceivers | Select only for cost-sensitive, low-current, always-on applications without shutdown requirement |
| Torex XC6206P182MR-G | 150mA max output, 1µA standby current, SC-70-5 package, no thermal shutdown | Inadequate current for multi-peripheral sensor hubs; missing OTSD limits field reliability | Consider only for ultra-low-power, single-sensor nodes where thermal margin is guaranteed |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, AP2125K-1.8TRG1 uniquely combines 300mA delivery, 0.01µA shutdown, integrated thermal protection, and SC-70-5 packaging-making it the only option meeting full requirements for compact, battery-powered RF and sensor systems.
Availability
AP2125K-1.8TRG1 is available at Aetrix Electronics and suitable for GNSS receivers, wearable health monitors, industrial handheld scanners, and smart meter communication modules requiring stable component supply with guaranteed long-term availability.
Supply support for AP2125K-1.8TRG1 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 regulation in battery-constrained portable electronics and RF subsystems.
FAQ
What is the minimum input voltage required for AP2125K-1.8TRG1 to regulate at full 300mA?
The AP2125K-1.8TRG1 requires VIN ≥ VOUT + VDROP. At 300mA, typical dropout is 300mV (per AP2125-3.3 data; 1.8V version extrapolated), so minimum VIN is 2.1V. However, the datasheet specifies VIN ≥ VOUT + 0.5V (≥2.3V) for guaranteed 300mA operation across temperature and process variation.
Can AP2125K-1.8TRG1 be used with 0.47µF output capacitors?
No. The datasheet mandates ≥1µF ceramic output capacitance for stability. Using 0.47µF risks oscillation due to insufficient phase margin, as confirmed by ESR vs. output current plots showing instability below 1µF in SC-70-5 configuration.
Does the NC pin (Pin 3) require PCB layout isolation?
No. Pin 3 is internally unconnected with no bond wire or silicon tie. It may be left floating, tied to GND, or routed as a keep-out zone-none affects electrical performance. Datasheet explicitly states "No connection" with no recommended treatment.
How does thermal shutdown behave during continuous overload?
At junction temperature ≥160°C, the AP2125K-1.8TRG1 disables output and enters thermal shutdown. It remains off until temperature drops by ≥25°C (to ≤135°C), then automatically resumes regulation-preventing damage without requiring external reset circuitry.
AP2125K-1.8TRG1 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.36V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 70db (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-1.8TRG1 FAQ
1.How can I place an order for AP2125K-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125K-1.8TRG1 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 AP2125K-1.8TRG1 reliable?
The price and inventory of AP2125K-1.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125K-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125K-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125K-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125K-1.8TRG1?
AP2125K-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125K-1.8TRG1 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 AP2125K-1.8TRG1?
For technical support, including AP2125K-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125K-1.8TRG1 requirements.
6.How does Aetrix verify that AP2125K-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125K-1.8TRG1 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 AP2125K-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125K-1.8TRG1?
All AP2125K-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125K-1.8TRG1, 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 AP2125K-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125K-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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