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onsemi NCP103AMX320TCG
- Part No.:
- NCP103AMX320TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP103AMX320TCG.pdf
- Description:
- IC REG LINEAR 3.2V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:102,000
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Product details
Overview
NCP103AMX320TCG from onsemi is a 150 mA CMOS low-dropout (LDO) regulator with fixed 3.2 V output, active output discharge function, and ultra-low quiescent current (50 µA typ.) optimized for battery-powered portable electronics. It operates from 1.7 V to 5.5 V input, delivers ±1% output accuracy at room temperature, and maintains stability with only a 1 µF ceramic output capacitor in its 1.0 × 1.0 mm uDFN4 package.
For engineers reviewing the NCP103AMX320TCG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The NCP103AMX320TCG integrates a PMOS pass transistor with dynamic quiescent current adjustment, enabling ultra-low IQ (50 µA typ.) at no-load while maintaining fast transient response. Its internal bandgap reference and error amplifier deliver tight regulation (±1% at 25°C) across −40°C to +85°C junction temperature.
It features integrated thermal shutdown (160°C trip), current limiting (550 mA typ.), and an active output discharge path (100 Ω typical) activated during disable - a capability exclusive to "A"-suffix variants like NCP103AMX320TCG. PSRR reaches 75 dB at 1 kHz, supporting noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.2 V - eliminates external feedback network; enables single-supply biasing for 3.3 V logic interfaces with margin. |
| Max Output Current | 150 mA continuous - sufficient for powering microcontrollers, sensors, or RF transceivers in compact wearables. |
| Dropout Voltage | 70 mV typ. at 150 mA (VOUT = 3.2 V) - allows operation down to VIN = 3.27 V, extending battery runtime in Li-ion or coin-cell systems. |
| Quiescent Current | 50 µA typ. at no load - reduces standby power loss by >90% vs. legacy LDOs, critical for multi-year IoT sensor node life. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from DC-DC converters feeding the LDO input, preserving ADC/SERDES signal integrity. |
| Output Noise | 60 µVrms (10 Hz–100 kHz) - low enough for powering precision analog front-ends (e.g., medical sensor signal chains) without added filtering. |
| Enable Threshold | VEN_HI = 0.9 V, VEN_LO = 0.4 V - compatible with 1.8 V/3.3 V GPIOs; hysteresis prevents chatter during slow-rising control signals. |
Pinout & Package
Package: uDFN4 (1.0 × 1.0 mm, 0.65 mm pitch, Case 517CU), Pb-free, RoHS-compliant. Exposed pad (EPAD) must be soldered to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output voltage node | Connect ≥1 µF X5R/X7R ceramic capacitor directly to GND; minimum effective capacitance 0.22 µF required for stability across temp/bias. |
| 2 - GND | Power ground reference | Primary return path for load current and internal bias; EPAD must be tied to same GND plane with low-inductance connection. |
| 3 - EN | Active-high enable control | Drive >0.9 V to enable regulation; <0.4 V to disable and activate 100 Ω output discharge - ensures rapid VOUT ramp-down in power sequencing. |
| 4 - IN | Input voltage supply | Accepts 1.7–5.5 V; requires ≥1 µF ceramic capacitor near pin to suppress high-frequency noise and limit inrush during load transients. |
Key Features
| Feature | Design Value |
|---|---|
| Active Output Discharge | 100 Ω typical discharge path to GND when disabled - prevents floating outputs and enables clean power-down sequencing in multi-rail systems. |
| Ultra-Low Quiescent Current | 50 µA typical at zero load - extends battery life in always-on applications such as BLE beacons or environmental monitors. |
| Stable with Small Ceramic Cap | Guaranteed stable with 1 µF X7R/X5R MLCC - eliminates need for larger, higher-ESR tantalum caps, reducing BOM cost and board area. |
| High PSRR at 1 kHz | 75 dB rejection of input ripple - enables clean power delivery to noise-sensitive circuits (e.g., PLLs, ADCs) even when sharing input with noisy SMPS. |
| Thermal & Current Protection | 160°C thermal shutdown with 20°C hysteresis and 550 mA current limit - prevents damage during overload or poor heatsinking in sealed enclosures. |
Applications
| Wearable Health Monitor | BLE Wireless Sensor Node |
|---|---|
|
Use Scenario: Compact wrist-worn device measuring heart rate and SpO₂ using analog front-end (AFE) and BLE SoC. IC Role / Device Role / Timing Role: Primary 3.2 V supply for AFE and BLE radio; provides low-noise, low-IQ bias under intermittent sensing duty cycles. Use Value: 60 µVrms output noise avoids SNR degradation in AFE; 50 µA IQ extends CR2032 battery life beyond 12 months in sleep mode. |
Use Scenario: Battery-powered industrial temperature/humidity sensor transmitting data via Bluetooth Low Energy every 5 seconds. IC Role / Device Role / Timing Role: Regulates 3.2 V rail for MCU and BLE transceiver; enables fast turn-on (<90 µs) after wake-up from deep sleep. Use Value: Active discharge clears VOUT within 100 µs upon disable, ensuring reliable reset timing and preventing back-powering of upstream circuitry. |
| Portable Medical Diagnostic Tool | Smartphone Peripheral Accessory |
|
Use Scenario: Handheld ECG patch with analog signal conditioning, microcontroller, and USB-C charging interface. IC Role / Device Role / Timing Role: Supplies 3.2 V to precision op-amps and SAR ADC; rejects ripple from USB-C PD charger's 5 V input. Use Value: 75 dB PSRR at 1 kHz attenuates 5 V rail noise by >5600×, eliminating need for additional LC filtering before ADC reference. |
Use Scenario: Add-on audio DAC/headphone amp module connecting to smartphone via USB OTG or Lightning adapter. IC Role / Device Role / Timing Role: Generates clean 3.2 V for DAC and headphone driver; supports dynamic load steps up to 150 mA during audio playback peaks. Use Value: 70 mV dropout at full load allows operation from degraded 3.7 V Li-ion cells down to 3.27 V, maximizing usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3202E/TT | 3.2 V fixed, 250 mA, 1.6 µA IQ, no active discharge, SOT-23-5 | Lacks output discharge; higher max current but significantly higher dropout (178 mV @ 250 mA) | Choose for ultra-low-IQ battery monitoring where discharge isn't needed and PCB space allows SOT-23. |
| Torex XC6206P322MR-G | 3.2 V fixed, 150 mA, 1 µA IQ, no active discharge, SOT-25 | No active discharge; lower IQ but inferior PSRR (65 dB @ 1 kHz) and higher dropout (200 mV @ 150 mA) | Prefer for cost-sensitive, low-power sensor nodes where PSRR and fast transient response are secondary. |
Compared with MCP1700T-3202E/TT and XC6206P322MR-G, the NCP103AMX320TCG uniquely combines active output discharge, 75 dB PSRR, and sub-100 mV dropout in a 1.0 × 1.0 mm footprint - making it optimal for space-constrained, noise-sensitive, and sequenced-power applications.
Availability
NCP103AMX320TCG is available at Aetrix Electronics and suitable for wearable health monitors, BLE sensor nodes, portable medical diagnostics, and smartphone peripheral accessories requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP103AMX320TCG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP103 series is designed specifically for ultra-low-power, space-constrained battery-operated devices - emphasizing dynamic IQ optimization, small-footprint packaging, and robust protection for mission-critical portable electronics.
FAQ
What is the output voltage tolerance of the NCP103AMX320TCG over temperature?
The NCP103AMX320TCG guarantees ±1% output voltage accuracy at room temperature (25°C). Over the full operating junction temperature range (−40°C to +85°C), output voltage deviation remains within ±2% for VOUT > 2.0 V - confirmed per Electrical Characteristics table on page 3 of the datasheet. This ensures reliable logic-level compatibility across environmental conditions without external trimming.
Does the NCP103AMX320TCG require an external pull-up resistor on the EN pin?
No. The NCP103AMX320TCG includes an internal pull-down current source (~300 nA) on the EN pin, ensuring default-disable behavior when left unconnected. If enable functionality is not needed, the EN pin should be tied directly to IN - a configuration explicitly recommended in the Applications Information section (page 12) to guarantee reliable startup.
Can the NCP103AMX320TCG operate with a 1.0 µF output capacitor from a different dielectric family, such as X7S or Y5V?
No. The NCP103AMX320TCG is characterized and guaranteed stable only with X5R or X7R dielectric ceramic capacitors (minimum 1.0 µF). X7S and Y5V exhibit excessive capacitance loss under DC bias and temperature, potentially falling below the 0.22 µF minimum effective capacitance required for stability - risking oscillation or poor transient response per Application Information (page 12).
What is the maximum allowable input voltage for the NCP103AMX320TCG?
The absolute maximum input voltage for the NCP103AMX320TCG is 6 V, as specified in the Absolute Maximum Ratings table (page 2). However, for reliable operation within datasheet-specified electrical characteristics, VIN must remain between 1.7 V and 5.5 V - exceeding 5.5 V may cause parametric degradation or permanent damage despite the 6 V absolute rating.
How does the active output discharge function behave during shutdown of the NCP103AMX320TCG?
When the EN pin voltage falls below 0.4 V, the NCP103AMX320TCG disables regulation and activates an internal 100 Ω (typ.) NMOS discharge path from OUT to GND. This pulls VOUT to ground within microseconds - confirmed in Figure 41 and described in Applications Information (page 12) - preventing residual voltage from interfering with system reset or back-powering adjacent circuitry.
NCP103AMX320TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.2V
- 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)
NCP103AMX320TCG FAQ
1.How can I place an order for NCP103AMX320TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP103AMX320TCG 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 NCP103AMX320TCG reliable?
The price and inventory of NCP103AMX320TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP103AMX320TCG is usually 5 days.
3.What payment methods are accepted for NCP103AMX320TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP103AMX320TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP103AMX320TCG?
NCP103AMX320TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP103AMX320TCG 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 NCP103AMX320TCG?
For technical support, including NCP103AMX320TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP103AMX320TCG requirements.
6.How does Aetrix verify that NCP103AMX320TCG is sourced from the original manufacturer or authorized distributors?
All NCP103AMX320TCG 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 NCP103AMX320TCG meets industry standards.
7.What is the process for return or replacement of NCP103AMX320TCG?
All NCP103AMX320TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP103AMX320TCG, 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 NCP103AMX320TCG part is unused and in its original packaging.
Return procedure for NCP103AMX320TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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