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onsemi NCP103AMX125TCG
- Part No.:
- NCP103AMX125TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP103AMX125TCG.pdf
- Description:
- IC REG LINEAR 1.25V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,248
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Product details
Overview
NCP103AMX125TCG from onsemi is a 150 mA CMOS low-dropout linear regulator with fixed 1.25 V output, optimized for space-constrained, noise-sensitive battery-powered systems. It delivers ±1% output accuracy at room temperature, 75 mV typical dropout at 150 mA (VOUT = 3.1 V), and 75 dB PSRR at 1 kHz - enabling stable power for RF and analog circuitry in portable electronics.
For engineers reviewing the NCP103AMX125TCG datasheet, pinout, applications, or equivalent options, key selection criteria include active output discharge capability, ultra-low 50 µA typical quiescent current, compatibility with 1 µF ceramic output capacitors, and thermal shutdown/current limit protection in the uDFN4 1.0×1.0 mm package.
Technical Context
The NCP103AMX125TCG integrates a PMOS pass transistor with dynamic quiescent current adjustment to minimize IQ across load conditions. Its internal bandgap reference, active discharge MOSFET, and thermal shutdown circuit operate independently of external components - enabling single-supply operation from 1.7 V to 5.5 V input while maintaining regulation down to 75 mV headroom at full load.
Unlike standard LDOs, this variant includes an integrated active output discharge path (100 Ω typical) activated during shutdown via the EN pin, ensuring rapid VOUT decay to GND. The device remains stable with 0.22 µF–10 µF X5R/X7R ceramic capacitors and exhibits no ESR dependency on COUT, simplifying layout for high-transient applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.25 V ±1% at 25°C; ensures precise biasing for ADC references and low-voltage logic without external feedback. |
| Max Output Current | 150 mA continuous; supports multiple low-power peripherals (e.g., Bluetooth radios, sensors) from a single rail. |
| Dropout Voltage | 75 mV typical at 150 mA (VOUT = 3.1 V); enables operation from partially discharged Li-ion cells (≥2.9 V). |
| Quiescent Current | 50 µA typical at no load; extends battery life in always-on monitoring modes (e.g., wearable sleep tracking). |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from DC-DC converters feeding the same system rail. |
| Enable Threshold | VEN_HI = 0.9 V, VEN_LO = 0.4 V; compatible with 1.8 V/3.3 V GPIOs without level-shifting. |
| Active Discharge | 100 Ω typical resistance; discharges 1 µF output cap to <100 mV in <100 µs, preventing back-powering of downstream ICs. |
Pinout & Package
Package: uDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (Case 517CU). Requires solder connection of EPAD to GND for thermal performance (RJA = 170°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Regulated output voltage node | Connect ≥1 µF ceramic capacitor directly to GND; minimum 0.22 µF effective capacitance required for stability. |
| 2: GND | Power ground reference | Return path for all currents; must be tied to EPAD and large PCB copper pour for thermal dissipation. |
| 3: EN | Enable/disable control input | Drives >0.9 V to enable regulation; <0.4 V to disable + activate output discharge; internal 300 nA pull-down. |
| 4: IN | Input voltage supply | Accepts 1.7–5.5 V; requires ≥1 µF ceramic capacitor close to pin to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic IQ adjustment | Reduces quiescent current to 50 µA at no load and scales with output current - critical for multi-day battery life in IoT endpoints. |
| Active output discharge | Integrated 100 Ω discharge path pulls VOUT to GND within microseconds upon EN deactivation - prevents latch-up in mixed-voltage systems. |
| Ultra-low-noise regulation | 60 µVRMS (10 Hz–100 kHz) at 1.2 V/150 mA; eliminates audible noise in audio codec power rails and jitter in clock buffers. |
| Robust protection suite | Thermal shutdown (160°C), current limit (550 mA typ), and short-circuit immunity - enables unattended operation in sealed enclosures. |
| Ceramic capacitor stability | Stable with 1 µF X7R/X5R MLCCs; eliminates need for tantalum or electrolytic capacitors - reducing BOM cost and board area. |
Applications
| Wireless Sensor Node Power | Wearable Biometric Monitoring |
|---|---|
Use Scenario: Powering BLE SoC, accelerometer, and optical heart-rate sensor from a single 3.0 V coin cell. IC Role / Device Role / Timing Role: Primary 1.25 V LDO supplying analog front-end and digital core; maintains regulation during RF transmit bursts. Use Value: 50 µA IQ extends battery life to >1 year; 75 dB PSRR isolates sensor ADC from BLE RF noise. |
Use Scenario: Providing clean 1.25 V bias to photodiode amplifier and ADC in compact wrist-worn pulse oximeter. IC Role / Device Role / Timing Role: Low-noise analog rail generator; active discharge prevents residual voltage from interfering with next measurement cycle. Use Value: 60 µVRMS noise ensures <1% measurement error in SpO₂ calculation; uDFN4 footprint fits tight mechanical constraints. |
| Portable Medical Diagnostic Tool | Industrial Handheld Scanner |
Use Scenario: Powering precision op-amps and reference buffers in battery-operated glucose meter with LCD display. IC Role / Device Role / Timing Role: Stable 1.25 V reference rail for 16-bit SAR ADC; dropout margin allows operation until battery reaches 2.9 V. Use Value: ±1% accuracy guarantees calibration integrity over temperature; thermal shutdown prevents overheating during extended self-test. |
Use Scenario: Supplying 1.25 V to barcode image sensor and FPGA configuration logic in ruggedized handheld scanner. IC Role / Device Role / Timing Role: Secondary LDO for low-voltage logic; EN pin synchronized with wake/sleep cycles to minimize standby power. Use Value: 0.1 µA shutdown current enables multi-week shelf life; 150 mA capacity handles peak sensor readout loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1202E/TT | No active discharge; 2.5 µA IQ; 250 mA max output; SOT-23-5 package | Lacks fast VOUT discharge; higher dropout (600 mV @ 250 mA) | Choose when ultra-low IQ dominates over discharge speed and board space is less constrained. |
| Torex XC6206P122MR-G | 120 mA max output; no EN pin; 1.0 µA IQ; SOT-25 package | Fixed-enable only; lower current rating limits multi-peripheral use | Choose for cost-sensitive, non-shutdown applications where 120 mA suffices and EN control is unnecessary. |
Compared with MCP1700T-1202E/TT and XC6206P122MR-G, the NCP103AMX125TCG uniquely combines active discharge, 150 mA capability, and uDFN4 size - making it optimal for compact, multi-state portable devices requiring rapid power sequencing and robust transient response.
Availability
NCP103AMX125TCG is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable biometric monitors, portable medical diagnostics, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for NCP103AMX125TCG 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.
The NCP103AMX125TCG belongs to onsemi's high-performance LDO family designed specifically for battery-powered portable equipment demanding ultra-low IQ, fast transient response, and miniature packaging.
FAQ
What is the output voltage tolerance of the NCP103AMX125TCG over temperature?
The NCP103AMX125TCG maintains ±1% output voltage accuracy at room temperature (25°C). Over the full operating junction temperature range (−40°C to +85°C), the output voltage deviation is specified as ±40 mV for VOUT ≤ 2.0 V - which corresponds to ±3.2% for the 1.25 V nominal output. This is confirmed in the Electrical Characteristics table on page 3 of the datasheet under "Output Voltage Accuracy".
Does the NCP103AMX125TCG require an external resistor network to set its output voltage?
No, the NCP103AMX125TCG is a fixed-output LDO with factory-trimmed 1.25 V regulation. It contains no external feedback pins and does not support adjustable output configurations. The "MX125" suffix explicitly denotes the 1.25 V fixed option, eliminating the need for resistors, trimming, or external compensation networks.
How does the active output discharge function operate in the NCP103AMX125TCG?
In the NCP103AMX125TCG, the active output discharge activates automatically when the EN pin voltage falls below 0.4 V. An internal 100 Ω (typical) NMOS transistor connects OUT to GND, discharging a 1 µF output capacitor to <100 mV in under 100 µs. This feature is exclusive to "A"-suffix variants like the NCP103AMX125TCG and is absent in "B"-suffix parts.
Can the NCP103AMX125TCG be used with a 0.47 µF ceramic output capacitor?
Yes - the NCP103AMX125TCG is stable with output capacitances as low as 0.22 µF (effective value after DC bias and temperature derating). A 0.47 µF X7R 0402 capacitor typically retains >0.35 µF at 1.25 V bias and 85°C, satisfying the minimum requirement. However, 1 µF is recommended for optimal load transient response per the datasheet's Application Information section.
What is the maximum allowable input voltage for the NCP103AMX125TCG?
The absolute maximum input voltage for the NCP103AMX125TCG is 6 V, as stated in the Absolute Maximum Ratings table (page 2). For reliable operation, the recommended operating input voltage range is 1.7 V to 5.5 V. Exceeding 6 V risks permanent damage, even momentarily - especially during hot-swap or load-dump events in portable systems.
NCP103AMX125TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (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:
- 4-UDFN (1.0x1.0)
NCP103AMX125TCG FAQ
1.How can I place an order for NCP103AMX125TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP103AMX125TCG 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 NCP103AMX125TCG reliable?
The price and inventory of NCP103AMX125TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP103AMX125TCG is usually 5 days.
3.What payment methods are accepted for NCP103AMX125TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP103AMX125TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP103AMX125TCG?
NCP103AMX125TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP103AMX125TCG 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 NCP103AMX125TCG?
For technical support, including NCP103AMX125TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP103AMX125TCG requirements.
6.How does Aetrix verify that NCP103AMX125TCG is sourced from the original manufacturer or authorized distributors?
All NCP103AMX125TCG 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 NCP103AMX125TCG meets industry standards.
7.What is the process for return or replacement of NCP103AMX125TCG?
All NCP103AMX125TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP103AMX125TCG, 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 NCP103AMX125TCG part is unused and in its original packaging.
Return procedure for NCP103AMX125TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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