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Diodes Incorporated AP2125N-1.8TRE1
- Part No.:
- AP2125N-1.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2125N-1.8TRE1.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
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Product details
Overview
AP2125N-1.8TRE1 from Diodes Incorporated is a 300mA, fixed 1.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, 70dB PSRR at 100Hz/1kHz, and 60µA typical quiescent current. It integrates over-temperature shutdown, current limiting, and active-high enable control-designed for noise-sensitive RF and digital core supplies in portable battery-powered systems.
For engineers reviewing the AP2125N-1.8TRE1 datasheet, AP2125N-1.8TRE1 pinout, AP2125N-1.8TRE1 application, or AP2125N-1.8TRE1 equivalent, key selection criteria include ultra-low noise performance, dropout voltage under 12mV at 10mA load, ±2% output accuracy across –40°C to +85°C, and compatibility with 1µF ceramic input/output capacitors without ESR requirements.
Technical Context
The AP2125N-1.8TRE1 uses a CMOS pass transistor architecture with an internal voltage reference and error amplifier to regulate output precisely. Its enable circuit allows logic-controlled shutdown with 0.01µA standby current, while the OTSD circuit triggers at +160°C with +25°C hysteresis to protect against thermal runaway.
Designed for high ripple rejection in noisy supply environments, it achieves 70dB PSRR at both 100Hz and 1kHz with minimal external components. The device maintains stable regulation across input voltages from 2.3V to 6V and supports full 300mA output current with dropout as low as 12mV at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (1.764–1.836V), ensuring stable core voltage for 1.8V logic and RF ICs |
| Max Output Current | 300mA minimum, sufficient for powering microcontrollers, sensors, and baseband processors |
| Dropout Voltage | 12mV typical at IOUT = 10mA; enables operation with VIN as low as 1.812V |
| RMS Output Noise | 50µVrms (10Hz–100kHz), critical for analog/RF sections requiring clean biasing |
| PSRR | 70dB typical at 100Hz/1kHz, rejecting switching noise from upstream DC/DC converters |
| Quiescent Current | 60µA typical, minimizing battery drain in always-on subsystems |
| Standby Current | 0.01µA typical when CE = low, enabling µA-level system sleep modes |
| Thermal Shutdown | Activates at +160°C with +25°C hysteresis, preventing permanent damage during overload |
Pinout & Package
AP2125N-1.8TRE1 is housed in a 5-pin SC-70-5 package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input voltage supply | Accepts 2.3V–6V; requires 1µF ceramic capacitor for stability |
| 2 - GND | Ground reference | Common return path for input, output, and internal circuits; must be low-impedance |
| 3 - NC | No connection | Internally unconnected; must remain floating-no external tie required |
| 4 - CE | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.4V disables output and reduces IQ to 0.01µA |
| 5 - VOUT | Regulated output | Delivers 1.8V ±2% with 50µVrms noise; requires 1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables use in RF front-ends and precision ADC references |
| High PSRR at audio frequencies | 70dB rejection at 100Hz/1kHz suppresses noise from buck converter switching artifacts |
| Sub-100mV dropout at 100mA | 65mV max dropout (3.3V version) confirms robust low-VIN headroom capability across variants |
| Green RoHS/Green package | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), compliant with EU Directive 2011/65/EU |
| Full protection integration | Includes current limit (50mA short-circuit), thermal shutdown (+160°C), and reverse-current blocking |
| Ceramic capacitor compatibility | Stable with 1µF low-ESR ceramics on input and output-no tantalum or electrolytic required |
Applications
| CDMA/GSM Cellular Handsets | Battery-Powered Medical Sensors |
|---|---|
|
Use Scenario: Powering RF transceiver LNA and mixer stages in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Low-noise 1.8V supply for analog signal chain biasing; replaces noisier switching regulators in RF section. Use Value: 50µVrms noise prevents reciprocal mixing and preserves receiver sensitivity below –100dBm. |
Use Scenario: Supplying ultra-low-power biosignal amplifiers and ADCs in wearable ECG patches. IC Role / Device Role / Timing Role: Precision 1.8V rail for analog front-end; enabled only during sampling bursts via CE pin. Use Value: 0.01µA standby current extends coin-cell life beyond 12 months in intermittent-monitoring mode. |
| Laptop Core Logic Rails | PCMCIA Card Interface Power |
|
Use Scenario: Delivering clean 1.8V to FPGA configuration banks and low-voltage I/O buffers in ultrabooks. IC Role / Device Role / Timing Role: Post-regulator after main 3.3V buck; provides localized low-noise supply with fast transient response. Use Value: 70dB PSRR and 12mV dropout ensure stable voltage during CPU burst loads without affecting signal integrity. |
Use Scenario: Powering hot-pluggable PCMCIA card logic and interface circuitry in industrial data loggers. IC Role / Device Role / Timing Role: Enable-controlled 1.8V source that powers up only after card insertion detection and reset sequencing. Use Value: CE pin logic interface simplifies power sequencing and prevents backfeed during card swap operations. |
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; 17µVrms noise; no enable pin; SOT-23-3 package | Lacks CE control and thermal shutdown; limited to simpler, lower-current rails | Choose when enable functionality and 300mA headroom are unnecessary and board space is constrained |
| TPS7A0518PDBVR | 200mA max; 5.5µVrms noise; 1.4µA quiescent current; integrated soft-start | Superior noise and IQ but lower current rating; not suitable for >200mA loads | Prefer for ultra-low-power sensor nodes where 200mA suffices and sub-6µV noise is mandatory |
Compared with MCP1700T-1802E/TT and TPS7A0518PDBVR, the AP2125N-1.8TRE1 uniquely balances 300mA drive capability, 50µVrms noise, active enable control, and thermal protection in a 2.0mm × 1.25mm footprint-making it optimal for compact, battery-powered systems requiring both performance and robustness.
Availability
AP2125N-1.8TRE1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable medical instrumentation, and laptop embedded controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP2125N-1.8TRE1 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 solutions for consumer, computing, and industrial markets.
The AP2125 series belongs to Diodes' precision LDO regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and small-footprint packaging.
FAQ
What is the minimum input voltage required for regulation at 1.8V output?
The AP2125N-1.8TRE1 requires VIN ≥ VOUT + VDROP. With a typical dropout of 12mV at 10mA and 100mV at 100mA, the minimum functional input is 1.812V at light load and 1.9V at full 300mA load. Absolute minimum VIN per datasheet is 2.3V to guarantee specification compliance across temperature and process variation.
Can AP2125N-1.8TRE1 operate with only 1µF ceramic capacitors on input and output?
Yes-AP2125N-1.8TRE1 is explicitly characterized and guaranteed stable with 1µF X5R/X7R ceramic capacitors on both input and output, with no ESR requirement. This eliminates need for bulk tantalum or aluminum electrolytics and reduces PCB area and cost.
How does the CE pin behave during power-up and shutdown sequences?
The CE pin is active-high with 1.5V threshold (min) for enable and 0.4V (max) for disable. During power-up, regulation begins only after VIN exceeds 2.3V AND CE rises above 1.5V. During shutdown, VOUT drops to near-zero within 10µs after CE falls below 0.4V, and quiescent current drops to 0.01µA.
Is AP2125N-1.8TRE1 compatible with lead-free reflow soldering processes?
Yes-AP2125N-1.8TRE1 is fully RoHS-compliant and rated for lead-free reflow with peak temperature up to +260°C for 10 seconds. Its SC-70-5 package meets JEDEC J-STD-020 moisture sensitivity level MSL3, requiring bake only if exposed to ambient >30°C/60% RH for >168 hours.
AP2125N-1.8TRE1 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-1.8TRE1 FAQ
1.How can I place an order for AP2125N-1.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125N-1.8TRE1 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-1.8TRE1 reliable?
The price and inventory of AP2125N-1.8TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125N-1.8TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125N-1.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125N-1.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125N-1.8TRE1?
AP2125N-1.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125N-1.8TRE1 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-1.8TRE1?
For technical support, including AP2125N-1.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125N-1.8TRE1 requirements.
6.How does Aetrix verify that AP2125N-1.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125N-1.8TRE1 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-1.8TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125N-1.8TRE1?
All AP2125N-1.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125N-1.8TRE1, 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-1.8TRE1 part is unused and in its original packaging.
Return procedure for AP2125N-1.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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