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Diodes Incorporated AP2125K-2.5TRG1
- Part No.:
- AP2125K-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2125K-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:30,727
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Product details
Overview
AP2125K-2.5TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.5V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, ±2% output voltage accuracy, and 65mV dropout at 100mA - optimized for noise-sensitive analog rails in portable battery-powered systems.
For engineers reviewing the AP2125K-2.5TRG1 datasheet, AP2125K-2.5TRG1 pinout, AP2125K-2.5TRG1 application, or AP2125K-2.5TRG1 equivalent, key selection criteria include ultra-low noise performance, enable-controlled shutdown with 0.01µA standby current, compatibility with ceramic capacitors, and thermal shutdown at +160°C.
Technical Context
This LDO employs a CMOS pass transistor architecture with integrated error amplifier, voltage reference, and over-temperature shutdown (OTSD). Its high PSRR (65dB at 1kHz) and low-noise design stem from internal filtering and biasing optimized for stable regulation under dynamic load transients.
The device supports active-high enable control (CE), allowing precise power sequencing, and operates across -40°C to +85°C ambient with input voltage range of (VOUT + 0.5V) to 6V - making it suitable for post-regulation in multi-rail portable systems where headroom and noise are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable supply for precision ADCs, RF ICs, or low-voltage logic without external feedback. |
| Max Output Current | 300mA minimum - sufficient to power microcontrollers, sensors, or small FPGAs in compact portable designs. |
| Dropout Voltage | 65mV at 100mA - enables operation with minimal input–output differential, extending battery life in single-cell Li-ion or 3-cell alkaline systems. |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - eliminates need for additional LC filtering in sensitive analog signal chains. |
| Quiescent Current | 60µA typical - maintains efficiency during light-load operation common in sleep-mode embedded systems. |
| Standby Current | 0.01µA typical - enables true zero-power shutdown when CE is low, critical for long-term battery storage. |
| PSRR | 65dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at +160°C with +25°C hysteresis - provides robust protection during sustained overload or poor PCB thermal design. |
Pinout & Package
AP2125K-2.5TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), optimized for space-constrained portable applications. Pinout is validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input voltage supply rail (2.5V + 0.5V to 6V); requires 1µF ceramic input 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; no routing or soldering required. |
| 4 | CE | Active-high enable input; logic high ≥1.5V enables regulation, logic low ≤0.4V places device in ultra-low-power shutdown. |
| 5 | VOUT | Regulated 2.5V output; requires 1µF ceramic output capacitor with ESR < 1Ω for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 50µVrms enables direct powering of RF receivers, audio codecs, and precision op-amps without added filtering. |
| High PSRR at 1kHz | 65dB rejection of mid-frequency ripple allows clean LDO output even when fed from noisy buck converter outputs. |
| Sub-100mV dropout | 65mV at 100mA permits use with input as low as 2.55V - ideal for brown-out tolerant operation in aging batteries. |
| 0.01µA shutdown current | Enables >10-year shelf life in battery-backed IoT nodes by eliminating parasitic drain during storage. |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R MLCCs - reduces BOM count and board area vs. tantalum or electrolytic alternatives. |
| ±2% output accuracy | Meets tight tolerance requirements for ADC reference supplies and sensor excitation circuits without calibration. |
Applications
| Wireless Sensor Node Power | Portable Medical Device Rail |
|---|---|
Use Scenario: Powers BLE SoC and analog front-end in coin-cell–operated environmental sensor node. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying RF transceiver core and 12-bit SAR ADC reference. Use Value: 50µVrms noise prevents quantization dither in ADC measurements; 0.01µA shutdown extends 10-year battery life. | Use Scenario: Supplies signal chain in handheld ECG monitor powered by single Li-ion cell. IC Role / Device Role / Timing Role: Low-noise post-regulator for instrumentation amplifier and ADC driver stage. Use Value: ±2% accuracy ensures consistent gain calibration; 65mV dropout preserves operating time down to 2.55V battery voltage. |
| Wearable Fitness Tracker Core | Industrial Handheld Scanner Logic |
Use Scenario: Delivers stable 2.5V to motion sensor hub and ultra-low-power MCU in wrist-worn tracker. IC Role / Device Role / Timing Role: Always-on LDO enabling fast wake-from-sleep with sub-10µs startup time. Use Value: 60µA quiescent current minimizes idle power; CE pin allows synchronized power gating with system controller. | Use Scenario: Provides regulated 2.5V for barcode image sensor and FPGA configuration logic in ruggedized scanner. IC Role / Device Role / Timing Role: Secondary LDO decoupling noisy DC/DC output to protect imaging pixel array timing. Use Value: 65dB PSRR at 1kHz suppresses switching artifacts that cause image banding; SC-70-5 footprint saves PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | 250mA max output, 175mV dropout at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; lower current rating limits use in higher-power peripherals | Select only if board space is constrained to 3-pin footprint and 250mA suffices. |
| TLS850B2TE/V2 | 500mA output, 200mV dropout, 120µVrms noise, automotive AEC-Q100 qualified, TSON-10 package | Higher noise, larger package, automotive-grade qualification adds cost and complexity beyond industrial needs | Choose only for automotive environments requiring extended temperature and reliability certification. |
Compared with MCP1700T-2502E/TT and TLS850B2TE/V2, AP2125K-2.5TRG1 uniquely balances ultra-low noise, enable control, thermal protection, and SC-70-5 miniaturization - making it optimal for space- and noise-critical portable electronics where 300mA capability and sub-100mV dropout are essential.
Availability
AP2125K-2.5TRG1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, wearable fitness trackers, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for AP2125K-2.5TRG1 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 company specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and protection solutions for high-volume industrial and consumer markets.
The AP2125 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and miniature packaging.
FAQ
What is the minimum input voltage required for AP2125K-2.5TRG1 to regulate at 2.5V?
The recommended minimum input voltage is VOUT + 0.5V = 3.0V, per the datasheet's Recommended Operating Conditions. At 100mA load, dropout is 65mV, so regulation is maintained down to 2.565V input - but stable operation below 3.0V is not guaranteed across temperature and process variation.
Can AP2125K-2.5TRG1 be used with a 0.47µF output capacitor?
No - the datasheet specifies 1µF minimum ceramic output capacitance for stability. Using 0.47µF risks oscillation or degraded transient response due to insufficient phase margin, especially with low-ESR MLCCs. Always use ≥1µF X5R/X7R capacitor with ESR < 1Ω.
Does AP2125K-2.5TRG1 require an input capacitor?
Yes - a 1µF ceramic input capacitor is required, placed as close as possible to VIN and GND pins. It suppresses high-frequency noise from upstream sources and prevents instability caused by source impedance interacting with the LDO's internal control loop.
Is the NC pin on AP2125K-2.5TRG1 electrically isolated or internally tied?
Pin 3 is explicitly designated "NC" (No Connection) in the datasheet pin description table and functional block diagram. It has no internal connection to silicon and must remain unconnected - neither grounded nor routed - to avoid unintended coupling or mechanical stress on the bond wire.
AP2125K-2.5TRG1 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):
- 2.5V
- 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:
- SOT-23-5
AP2125K-2.5TRG1 FAQ
1.How can I place an order for AP2125K-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125K-2.5TRG1 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-2.5TRG1 reliable?
The price and inventory of AP2125K-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125K-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125K-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125K-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125K-2.5TRG1?
AP2125K-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125K-2.5TRG1 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-2.5TRG1?
For technical support, including AP2125K-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125K-2.5TRG1 requirements.
6.How does Aetrix verify that AP2125K-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125K-2.5TRG1 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-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125K-2.5TRG1?
All AP2125K-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125K-2.5TRG1, 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-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2125K-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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