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Diodes Incorporated AP2125KC-1.8TRE1
- Part No.:
- AP2125KC-1.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-82
- Datasheet:
-
AP2125KC-1.8TRE1.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC82
- Quantity:
- Payment:
- Shipping:
Inventory:2,039
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Product details
Overview
AP2125KC-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 quiescent current. It integrates enable control, over-temperature shutdown, and current limiting for power management in space-constrained, battery-powered systems such as GSM/CDMA handsets and portable instruments.
For engineers reviewing the AP2125KC-1.8TRE1 datasheet, AP2125KC-1.8TRE1 pinout, AP2125KC-1.8TRE1 application, or AP2125KC-1.8TRE1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, active-high enable functionality, and ±2% output voltage accuracy across –40°C to +85°C ambient.
Technical Context
The AP2125KC-1.8TRE1 employs a CMOS-based error amplifier with internal voltage reference and resistor network to regulate output at precisely 1.8V. Its architecture supports stable operation with 1µF ceramic input/output capacitors and includes dedicated CE (chip enable) logic that transitions between 0.01µA standby and 60µA operating current.
Thermal protection is implemented via an integrated over-temperature shutdown circuit activating at +160°C with +25°C hysteresis, while current limiting caps output at 50mA during short-circuit conditions. Dropout voltage remains ≤12mV at 10mA load and ≤120mV at 100mA, enabling efficient regulation even near battery end-of-life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (1.764–1.836V), ensuring stable core supply for 1.8V logic and RF ICs |
| Max Output Current | 300mA minimum, sufficient for powering microcontrollers, sensors, and baseband processors |
| Dropout Voltage | 12mV @ 10mA / 120mV @ 100mA, enabling operation down to VIN = VOUT + 0.12V |
| RMS Output Noise | 50µVrms (10Hz–100kHz), critical for noise-sensitive analog/RF subsystems |
| PSRR | 70dB typical at 100Hz/1kHz, suppressing switching noise from upstream DC/DC converters |
| Quiescent Current | 60µA typical, minimizing battery drain in always-on monitoring circuits |
| Standby Current | 0.01µA typical, enabling µA-level system sleep mode power budgeting |
| Enable Threshold | CE high ≥1.5V, low ≤0.4V - compatible with 1.8V/3.3V GPIO without level shifting |
Pinout & Package
AP2125KC-1.8TRE1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply connection; accepts 2.3V to 6V, must be decoupled with ≥1µF ceramic capacitor |
| 2 | GND | Power ground reference; requires low-impedance PCB return path to minimize noise coupling |
| 3 | NC | No internal connection; left unconnected per datasheet - not usable as thermal pad or auxiliary node |
| 4 | CE | Active-high enable input; drives device into 0.01µA shutdown when pulled low (<0.4V) |
| 5 | VOUT | Regulated 1.8V output; requires ≥1µF ceramic capacitor with ESR <1Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for ADCs, PLLs, and RF front-ends |
| High PSRR at audio frequencies | 70dB rejection of 100Hz–1kHz ripple prevents audible noise in audio codecs |
| Sub-µA shutdown state | 0.01µA ISTD allows multi-year battery life in IoT sensor nodes with periodic wake-up |
| SC-70-5 footprint compatibility | 1.25mm × 1.65mm body enables placement in tight spaces where SOT-23-5 is too large |
| Thermal shutdown with hysteresis | +160°C trip point and +25°C hysteresis prevents thermal cycling damage during overload |
Applications
| Mobile Baseband Power | Wearable Sensor Hub |
|---|---|
Use Scenario: Supplying 1.8V core voltage to GSM/CDMA baseband processors in compact handsets. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 1.8V rail with fast transient response to processor load steps. Use Value: 70dB PSRR suppresses noise from PMIC switching regulators; 50µVrms noise ensures clean digital signaling and low BER. | Use Scenario: Powering MEMS accelerometers, temperature sensors, and BLE SoCs in wrist-worn devices. IC Role / Device Role / Timing Role: Always-on LDO maintaining 1.8V supply during deep-sleep modes with sub-µA quiescent draw. Use Value: 0.01µA standby current extends coin-cell battery life beyond 2 years; SC-70-5 size fits constrained flex PCB areas. |
| Portable Audio Codec | Industrial Handheld Terminal |
Use Scenario: Providing ultra-clean 1.8V bias to audio DACs and headphone amplifiers in portable media players. IC Role / Device Role / Timing Role: Low-noise post-regulator isolating sensitive analog stages from noisy digital supplies. Use Value: 50µVrms noise eliminates audible hiss; 60µA IQ avoids compromising battery runtime during playback. | Use Scenario: Regulating 1.8V for FPGA configuration memory and interface logic in ruggedized field terminals. IC Role / Device Role / Timing Role: Robust LDO with thermal shutdown protecting against enclosure overheating in sealed enclosures. Use Value: +160°C shutdown threshold and +25°C hysteresis prevent latch-up during extended operation in hot environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-1.8TRE1 | SOT-23-5 package (vs. SC-70-5); identical electrical specs and pinout except Pin 3 = NC in both | Larger footprint; better thermal dissipation (θJA = 200°C/W vs. 300°C/W) but occupies more board area | Select when thermal margin > board space constraints; same enable logic and noise performance |
| MCP1700T-1802E/TT | 250mA max output; 17µVrms noise; no CE pin; SOT-23-3 package with 3-pin functional mapping | Lower current capability and no enable control; simpler BOM but less flexible power sequencing | Choose only if 250mA suffices and enable functionality is unnecessary; lower noise but no shutdown mode |
Compared with AP2125K-1.8TRE1, the AP2125KC-1.8TRE1 trades thermal headroom for 35% smaller footprint-critical in ultra-thin mobile designs-while matching all electrical performance. Against MCP1700T-1802E/TT, it adds enable control and +50mA current capacity at the cost of slightly higher noise, enabling advanced power-state management.
Availability
AP2125KC-1.8TRE1 is available at Aetrix Electronics and suitable for battery-powered handheld instruments, GSM/CDMA cellular handsets, and portable information appliances requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP2125KC-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 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, designed specifically for noise-sensitive, space-constrained battery-powered equipment demanding ultra-low quiescent current and exceptional ripple rejection.
FAQ
What is the minimum input voltage required for AP2125KC-1.8TRE1 to maintain regulation at full 300mA load?
The AP2125KC-1.8TRE1 requires VIN ≥ VOUT + VDROP, where VDROP is 360mV maximum at 300mA (per DS38144 Rev. 2–2, p.4). Thus, minimum input is 1.8V + 0.36V = 2.16V. Operation below this causes dropout and output collapse; recommended minimum is 2.3V for margin.
Can AP2125KC-1.8TRE1 be used with tantalum output capacitors instead of ceramic?
No. The AP2125KC-1.8TRE1 is explicitly characterized and stabilized for use with low-ESR ceramic capacitors ≥1µF (DS38144 p.15). Tantalum capacitors typically exhibit higher ESR and potential instability risks; using them may cause oscillation or poor transient response and is not validated by Diodes.
Does the NC pin (Pin 3) on AP2125KC-1.8TRE1 require PCB connection or thermal treatment?
No. Pin 3 is internally unconnected (NC) and must remain floating per datasheet (DS38144 p.2). It is not bonded and provides no electrical or thermal function. Connecting it to GND or any net violates the design and may compromise reliability or ESD performance.
How does the CE pin behavior change across temperature and supply voltage variations?
The CE pin thresholds are specified as VCE(HI) ≥1.5V and VCE(LO) ≤0.4V over –40°C to +85°C and VIN = 2.8V to 6V (DS38144 p.4). These limits hold across full operating range; no derating is required. CE draws <10nA, making it compatible with weak GPIO drivers.
AP2125KC-1.8TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-82
- 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):
- 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:
- SC-82
AP2125KC-1.8TRE1 FAQ
1.How can I place an order for AP2125KC-1.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KC-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 AP2125KC-1.8TRE1 reliable?
The price and inventory of AP2125KC-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 AP2125KC-1.8TRE1 is usually 5 days.
3.What payment methods are accepted for AP2125KC-1.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KC-1.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KC-1.8TRE1?
AP2125KC-1.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KC-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 AP2125KC-1.8TRE1?
For technical support, including AP2125KC-1.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KC-1.8TRE1 requirements.
6.How does Aetrix verify that AP2125KC-1.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2125KC-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 AP2125KC-1.8TRE1 meets industry standards.
7.What is the process for return or replacement of AP2125KC-1.8TRE1?
All AP2125KC-1.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KC-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 AP2125KC-1.8TRE1 part is unused and in its original packaging.
Return procedure for AP2125KC-1.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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