My Inquiry
My Account
Diodes Incorporated AP2125KS-3.3TRG1
- Part No.:
- AP2125KS-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
AP2125KS-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,014
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2125KS-3.3TRG1 from Diodes Incorporated is a 300mA, fixed-output 3.3V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 65mV dropout at 100mA, 50µVrms output noise, ±2% output voltage accuracy, and 0.01µA standby current-designed for noise-sensitive RF and analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2125KS-3.3TRG1 datasheet, AP2125KS-3.3TRG1 pinout, AP2125KS-3.3TRG1 application, or AP2125KS-3.3TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility with space-constrained PCBs, enable-controlled shutdown for power sequencing, and ceramic capacitor compatibility without ESR requirements.
Technical Context
The AP2125KS-3.3TRG1 integrates a CMOS pass transistor, precision voltage reference, error amplifier, resistor network for fixed 3.3V output, active-high CE input, overcurrent protection, and thermal shutdown at +160°C with +25°C hysteresis. It operates across -40°C to +85°C ambient temperature with input voltage range of 3.8V to 6V.
Its architecture delivers high PSRR (65dB typical at 1kHz), low load regulation (13mV max over 1–300mA), and stable operation with 1µF ceramic input/output capacitors-enabling direct replacement of larger-footprint LDOs in GSM/CDMA RF front-end biasing and microcontroller core supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - ensures stable MCU I/O rail or RF IC bias within tight tolerance across temperature and load. |
| Max Output Current | 300mA min - supports moderate-power digital subsystems including ARM Cortex-M peripherals and sensor hubs. |
| Dropout Voltage | 65mV @ 100mA - enables operation from single-cell Li-ion (3.4V min) with >3.3V output retention under full load. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - meets stringent noise requirements for ADC references and RF synthesizer VCO supplies. |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring circuits such as IoT endpoint wake-up logic. |
| PSRR | 65dB @ 1kHz - suppresses switching noise from adjacent DC-DC converters feeding mixed-signal SoCs. |
| Enable Threshold | CE "High" ≥1.5V - compatible with 1.8V/3.3V GPIO control without level-shifting. |
Pinout & Package
AP2125KS-3.3TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm height), optimized for high-density portable designs. Pinout is validated per Diodes DS38144 Rev. 2–2, top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 3.8V–6V input; requires 1µF ceramic decoupling close to pin for stability. |
| 2 (GND) | Power ground reference | Low-impedance return path for both input and output currents; must connect to solid ground plane. |
| 3 (NC) | No connection | Internally unconnected; left floating-no external tie required or recommended. |
| 4 (CE) | Active-high enable input | Drives internal regulator ON when ≥1.5V; pulls output to undervoltage state when ≤0.4V (0.01µA shutdown current). |
| 5 (VOUT) | Regulated 3.3V output | Delivers up to 300mA with <15mV load regulation; stable with 1µF ceramic output capacitor (ESR < 1Ω). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 50µVrms enables clean power for RF transceivers and precision analog signal chains without post-regulation filtering. |
| Sub-100mV dropout | 65mV @ 100mA allows efficient use of aging or partially discharged Li-ion cells down to 3.4V while maintaining 3.3V output. |
| 0.01µA standby current | Enables multi-year battery life in maintenance-free IoT sensors during deep sleep modes with CE-controlled shutdown. |
| Ceramic capacitor compatible | Stable with 1µF input/output ceramics (no ESR requirement) - eliminates bulkier tantalum or aluminum electrolytics. |
| Thermal shutdown with hysteresis | +160°C trip with +25°C hysteresis prevents latch-up during transient overload and enables safe auto-recovery. |
Applications
| Cellular RF Front-End | Portable Medical Sensor Hub |
|---|---|
|
Use Scenario: Powering GSM/CDMA power amplifier bias and VCO tuning voltage in handset RF modules. IC Role / Device Role / Timing Role: Low-noise 3.3V LDO supplying critical analog rails where switching noise would degrade EVM or phase noise. Use Value: 50µVrms noise and 65dB PSRR prevent RF carrier leakage and maintain ACLR compliance under dynamic load. |
Use Scenario: Regulating power for ultra-low-power ECG/SpO₂ analog front-end and BLE SoC in wearable patches. IC Role / Device Role / Timing Role: Primary 3.3V supply enabling simultaneous analog sensing and wireless transmission with minimal quiescent draw. Use Value: 0.01µA standby current extends coin-cell battery life beyond 2 years in intermittent measurement mode. |
| Laptop Embedded Controller | Industrial Hand-Held Instrument |
|
Use Scenario: Supplying EC (Embedded Controller) core and I²C peripherals in notebook platform controller hubs. IC Role / Device Role / Timing Role: Always-on 3.3V rail supporting keyboard, thermal management, and battery gauge functions during S3/S5 states. Use Value: ±2% output accuracy ensures reliable I²C communication and accurate ADC reference despite input voltage sag. |
Use Scenario: Powering isolated data acquisition circuitry in handheld multimeters and insulation testers. IC Role / Device Role / Timing Role: Precision 3.3V source for sigma-delta ADC reference and op-amp signal conditioning stages. Use Value: Low load regulation (13mV) maintains ADC LSB accuracy across full 1–300mA operating range during autoranging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 250mA max output, 175mV dropout @ 250mA, 30µVrms noise, TO-92 package | Larger through-hole footprint; lower current capacity limits use in higher-load digital subsystems | Preferred for cost-sensitive, low-volume prototyping where board space is not constrained and load <250mA |
| TPS7A0533PDBVR | 200mA max, 175mV dropout @ 200mA, 12µVrms noise, SOT-23-5 package | Lower noise but reduced current rating and tighter VIN min (1.4V) - unsuitable for 3.8V+ input scenarios | Selected when ultra-low noise dominates over current capability and input voltage is <4.0V |
Compared with MCP1700-3302E/TO and TPS7A0533PDBVR, AP2125KS-3.3TRG1 uniquely balances 300mA drive, SC-70-5 miniaturization, and 50µVrms noise-making it optimal for production-grade portable RF and embedded systems where size, noise, and load headroom are jointly critical.
Availability
AP2125KS-3.3TRG1 is available at Aetrix Electronics and suitable for cellular handset RF modules, portable medical wearables, laptop embedded controllers, and industrial hand-held instruments requiring stable component supply with guaranteed long-term manufacturability.
Supply support for AP2125KS-3.3TRG1 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, with emphasis on power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
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 miniature packaging without sacrificing output accuracy or thermal robustness.
FAQ
What is the minimum input voltage required for AP2125KS-3.3TRG1 to maintain regulation?
The AP2125KS-3.3TRG1 requires VIN ≥ VOUT + VDROP. At 100mA load, dropout is 65mV, so minimum VIN = 3.3V + 0.065V = 3.365V. Per datasheet Recommended Operating Conditions, minimum VIN is specified as VOUT + 0.5V = 3.8V to ensure full performance across temperature and process variation.
Can AP2125KS-3.3TRG1 be used with ceramic capacitors only?
Yes. The AP2125KS-3.3TRG1 is explicitly designed for stability with low-ESR ceramic capacitors: 1µF input and 1µF output are sufficient. No series ESR is required, unlike older LDO architectures-eliminating need for tantalum or aluminum electrolytic types.
Does the NC pin (Pin 3) require any PCB layout treatment?
No. Pin 3 is internally unconnected (NC) and must remain floating-no solder mask opening, via, or trace should contact it. PCB layout should avoid routing signals or copper near this pad to prevent parasitic coupling or contamination-related leakage paths.
How does the CE pin behave during power-up and shutdown sequences?
The CE pin is active-high with 1.5V threshold. When CE rises above 1.5V, output ramps up in ~50µs (typical); when CE falls below 0.4V, output discharges via internal 120Ω pulldown, reaching <0.1V within 100µs. No external discharge circuit is needed.
AP2125KS-3.3TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 3.3V
- 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:
- SC-70-5
AP2125KS-3.3TRG1 FAQ
1.How can I place an order for AP2125KS-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125KS-3.3TRG1 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 AP2125KS-3.3TRG1 reliable?
The price and inventory of AP2125KS-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125KS-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125KS-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125KS-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125KS-3.3TRG1?
AP2125KS-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125KS-3.3TRG1 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 AP2125KS-3.3TRG1?
For technical support, including AP2125KS-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125KS-3.3TRG1 requirements.
6.How does Aetrix verify that AP2125KS-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125KS-3.3TRG1 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 AP2125KS-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125KS-3.3TRG1?
All AP2125KS-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125KS-3.3TRG1, 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 AP2125KS-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2125KS-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2125KS-3.3TRG1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
