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Diodes Incorporated AP2125N-1.8TRG1
- Part No.:
- AP2125N-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2125N-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,630
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Product details
Overview
AP2125N-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, ±2% output voltage accuracy, and 70dB PSRR at 100Hz–1kHz - designed for powering noise-sensitive analog and RF circuitry in battery-operated handheld devices.
For engineers reviewing the AP2125N-1.8TRG1 datasheet, AP2125N-1.8TRG1 pinout, AP2125N-1.8TRG1 application, or AP2125N-1.8TRG1 equivalent, key selection criteria include ultra-low noise performance, sub-100mV dropout at 100mA, 0.01µA standby current, compatibility with ceramic output capacitors, and thermal shutdown protection across –40°C to +85°C ambient operation.
Technical Context
The AP2125N-1.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, active-high enable (CE) control, current-limit protection, and over-temperature shutdown (OTSD) circuitry - all implemented in a CMOS process to minimize quiescent current and noise.
It operates with input voltages from 2.3V to 6.0V (VOUT + 0.5V min), delivers stable 1.8V output up to 300mA, and maintains regulation under fast load transients (10–100mA step) with <10mV undershoot/overshoot when using 1µF ceramic input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (1.764–1.836V) - ensures stable core supply for 1.8V logic and RF ICs without external feedback. |
| Max Output Current | 300mA minimum - supports power rails for microcontrollers, sensors, and wireless transceivers in compact portable systems. |
| Dropout Voltage | 100mV typical at 100mA (VIN ≥ 1.9V) - enables operation from single-cell Li-ion (3.0–4.2V) or two-cell alkaline (2.4–3.2V) sources with margin. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and jitter in ADC clocking paths. |
| PSRR | 70dB typical at 100Hz/1kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Quiescent Current | 60µA typical - extends battery life in always-on sensor nodes and low-power wake-up circuits. |
| Standby Current | 0.01µA typical (CE = low) - enables near-zero power state during system sleep modes. |
Pinout & Package
AP2125N-1.8TRG1 is packaged in a 5-pin SC-70-5 (SOT-753) surface-mount package, 2.0mm × 2.1mm × 0.9mm, with 0.65mm pitch and RoHS-compliant "Green" finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.3V–6.0V input; requires 1µF ceramic decoupling capacitor close to pin for stability. |
| 2 (GND) | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance connection to PCB ground plane. |
| 3 (NC) | No connection | Internally unconnected; left floating - no external tie required or recommended. |
| 4 (CE) | Enable control input | Active-high logic: ≥1.5V enables regulator; ≤0.4V disables output and reduces IQ to 0.01µA. |
| 5 (VOUT) | Regulated output | Delivers 1.8V ±2% to load; requires 1µF ceramic output capacitor with ESR <1Ω for stability per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for RF front-ends and high-resolution ADCs without additional filtering. |
| High PSRR at audio frequencies | 70dB rejection at 100Hz–1kHz suppresses ripple from buck converter switching artifacts and AC-DC adapter noise. |
| Sub-100mV dropout at 100mA | Allows direct regulation from partially discharged batteries while maintaining full 1.8V output down to VIN = 1.9V. |
| 0.01µA shutdown current | Reduces system standby power to nanoampere level - critical for multi-year battery life in IoT endpoint devices. |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R ceramics on input and output - eliminates need for larger, costlier tantalum or aluminum electrolytics. |
Applications
| RF Power Amplifier Bias Supply | Low-Power Microcontroller Core Rail |
|---|---|
|
Use Scenario: Providing clean bias voltage to GaAs or SiGe RF power amplifiers in GSM/CDMA handsets. IC Role / Device Role / Timing Role: LDO regulator delivering ultra-low-noise 1.8V supply to PA collector/drain node. Use Value: 50µVrms noise prevents AM-to-PM conversion and adjacent-channel leakage; 70dB PSRR isolates PA from noisy PMIC switchers. |
Use Scenario: Powering ARM Cortex-M0+ or RISC-V MCU cores operating at 1.8V in wearable health monitors. IC Role / Device Role / Timing Role: Primary core voltage regulator with enable control synchronized to MCU sleep/wake cycles. Use Value: 0.01µA shutdown current extends coin-cell battery life beyond 3 years; ±2% accuracy ensures reliable brown-out detection. |
| Portable Audio Codec Reference | Bluetooth LE Transceiver VDDIO |
|
Use Scenario: Supplying reference voltage to stereo audio DAC/ADC in Bluetooth headphones. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital switching domains. Use Value: 50µVrms noise avoids audible hiss; 60µA quiescent current minimizes impact on total system power budget. |
Use Scenario: Regulating I/O voltage for Bluetooth 5.0 SoC (e.g., Nordic nRF52840) interfacing with 1.8V sensors. IC Role / Device Role / Timing Role: Dedicated 1.8V I/O rail with fast enable response (<10µs) for peripheral power sequencing. Use Value: SC-70-5 footprint saves PCB area in space-constrained earbud designs; 300mA headroom supports burst transmit peaks. |
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, 170mV dropout at 100mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; lower current capacity limits use in burst-mode loads | Select when board space is constrained to 3-pin layout and 250mA suffices; verify thermal margin without OTSD. |
| Torex XC6206P182MR-G | 300mA, 1.8V, 120mV dropout at 100mA, 40µVrms noise, SOT-23-5 package, no CE pin | Fixed-on operation only; no enable control or shutdown mode - unsuitable for dynamic power gating | Choose for cost-sensitive, always-on applications where 0.01µA standby is unnecessary and enable functionality is omitted. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, AP2125N-1.8TRG1 uniquely combines 300mA capability, 0.01µA shutdown, integrated OTSD, and 70dB PSRR - making it optimal for battery-powered systems requiring both ultra-low noise and intelligent power management.
Availability
AP2125N-1.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable medical instrumentation, and Bluetooth LE wearable development requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for AP2125N-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP2125 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and robust thermal protection.
FAQ
What is the minimum input voltage required for AP2125N-1.8TRG1 to regulate 1.8V output?
The AP2125N-1.8TRG1 requires VIN ≥ VOUT + 0.5V = 2.3V for guaranteed regulation across temperature and load. At 100mA output, typical dropout is 100mV, so 1.9V input may sustain regulation but falls outside specified operating conditions and risks instability or dropout under worst-case tolerance and temperature.
Can AP2125N-1.8TRG1 be used with a 0.47µF output capacitor?
No - the datasheet specifies 1µF minimum ceramic output capacitance for stability. Using 0.47µF violates the stability criterion and may cause oscillation or excessive transient overshoot, especially under 10–100mA load steps. Always use ≥1µF X5R/X7R ceramic with ESR <1Ω.
Does AP2125N-1.8TRG1 support reverse-voltage protection?
No - the device lacks intrinsic reverse-voltage protection. Applying reverse polarity to VIN or VOUT can damage the IC. External protection (e.g., series Schottky diode or ideal diode controller) is required if system-level reverse-battery or hot-swap events are possible.
How does the CE pin behave during power-up when VIN ramps slowly?
The CE pin has no internal pull-up or pull-down; it must be actively driven high (>1.5V) or low (<0.4V) by the host system. If left floating during VIN ramp, the regulator may power up unpredictably due to noise coupling or internal leakage - a weak pull-down resistor (e.g., 1MΩ to GND) is recommended for deterministic startup behavior.
AP2125N-1.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2125N-1.8TRG1 FAQ
1.How can I place an order for AP2125N-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125N-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 AP2125N-1.8TRG1 reliable?
The price and inventory of AP2125N-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 AP2125N-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125N-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125N-1.8TRG1?
AP2125N-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125N-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 AP2125N-1.8TRG1?
For technical support, including AP2125N-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-1.8TRG1 requirements.
6.How does Aetrix verify that AP2125N-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125N-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 AP2125N-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125N-1.8TRG1?
All AP2125N-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-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 AP2125N-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125N-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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