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onsemi NCP121AMX140TCG
- Part No.:
- NCP121AMX140TCG
- Manufacturer:
- onsemi
- Package:
- 6-XFDFN Exposed Pad
- Datasheet:
-
NCP121AMX140TCG.pdf
- Description:
- IC REG LINEAR 1.4V 150MA 6XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:45,000
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Product details
Overview
NCP121AMX140TCG from onsemi is a fixed-output, high-accuracy, very low dropout (VLDO) linear voltage regulator with NMOS pass transistor and dual-rail operation (VIN and VBIAS). It delivers 150 mA at 1.40 V output with ±1.0% accuracy over line/load/temperature, 75 mV max dropout at full load, and ultra-low bias current (80 µA typ), optimized for noise-sensitive, space-constrained portable electronics.
For engineers reviewing the NCP121AMX140TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-rail bias architecture, active output discharge capability, XDFN6 1.2 mm × 1.2 mm package, and guaranteed stability with 1 µF ceramic output capacitor - all critical for battery-powered SoC post-regulation and I/O rail conditioning.
Technical Context
The NCP121AMX140TCG implements an NMOS pass transistor topology powered by separate VIN and VBIAS rails, decoupling control circuitry power from the regulated output path to minimize noise coupling and improve PSRR (80 dB from VBIAS, 70 dB from VIN). Its internal UVLO monitors VBIAS with 1.6 V threshold and 0.2 V hysteresis, ensuring reliable startup under varying bias conditions.
It features monotonic soft-start, thermal shutdown (160°C trip, 140°C release), current limiting (200–600 mA), and logic-level enable (VEN(H) = 0.9 V) with active discharge enabled only in "A" variant devices like NCP121AMX140TCG. The device operates across −40°C to +85°C junction temperature with 170°C/W junction-to-air thermal resistance in XDFN6 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.40 V - precisely set for core voltage scaling of low-power processors and memory I/O rails. |
| Accuracy | ±1.0% over line/load/temperature - ensures stable digital logic margins without external trimming. |
| Max Dropout (150 mA) | 75 mV - enables regulation from as low as 1.475 V input, critical for single-cell Li-ion post-regulation. |
| Bias Supply Range | 2.4 V to 5.5 V - supports shared bias rail with other system ICs while isolating noise-sensitive control circuits. |
| PSRR (1 kHz) | 80 dB (VBIAS→VOUT), 70 dB (VIN→VOUT) - suppresses switching noise from upstream DC/DC converters. |
| Output Noise | 40 µVRMS (10 Hz–100 kHz) - meets stringent analog/RF supply requirements in smartphones and cameras. |
| Enable Threshold | VEN(H) = 0.9 V - compatible with 1.2 V or 1.8 V GPIOs without level-shifting. |
Pinout & Package
XDFN6 package (Case 711AT), 1.2 mm × 1.2 mm × 0.4 mm, thermally enhanced with exposed thermal pad soldered to GND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers stable 1.40 V to load; requires direct connection to 1 µF ceramic capacitor for stability. |
| 2 - N/C | No internal connection | Not bonded; must be left floating or tied to GND per layout best practice - no electrical function. |
| 3 - EN | Logic-enable input | Active-high control: ≥0.9 V enables regulator; ≤0.4 V disables with active output discharge (NCP121A only). |
| 4 - BIAS | Bias supply input | Powers internal reference/control circuits; monitored by UVLO; must be ≥2.4 V and ≥(VOUT + 1.35 V). |
| 5 - GND | Ground reference | Common return for IN, OUT, EN, BIAS; thermal pad must be soldered to PCB ground plane. |
| 6 - IN | Main input supply | Primary power source for pass transistor; dropout defined relative to OUT (e.g., 1.475 V min at 150 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Active output discharge | Enabled only in NCP121A variants (e.g., NCP121AMX140TCG); pulls OUT to GND when disabled, preventing floating voltage on downstream loads. |
| Dual-rail architecture | Separate VIN and VBIAS inputs isolate noise-sensitive control circuitry from power path, improving PSRR and enabling flexible system rail assignment. |
| Ultra-low bias current | 80 µA typical (150 mA load) - extends battery life in always-on subsystems such as sensor hubs or real-time clocks. |
| Stable with 1 µF ceramic | No ESR requirement; eliminates need for tantalum or aluminum electrolytic capacitors, reducing board area and cost. |
| Thermal shutdown protection | Auto-recovery at 140°C after 160°C trip - prevents permanent damage during transient overload or poor heatsinking. |
Applications
| Smartphone Application Processor Core Rail | Tablet Memory I/O Supply |
|---|---|
Use Scenario: Regulating 1.40 V core voltage for ARM Cortex-A series CPUs operating in dynamic voltage/frequency scaling (DVFS) mode. IC Role / Device Role / Timing Role: Post-regulator providing clean, low-noise, tightly regulated supply directly to processor VDD_CORE pins. Use Value: Maintains ±1.0% output accuracy across temperature and load transients, ensuring timing margin integrity and preventing logic errors during burst processing. |
Use Scenario: Powering LPDDR4/LPDDR5 I/O interfaces requiring precise 1.40 V supply with fast transient response. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable I/O voltage synchronized with memory controller clock domains. Use Value: 40 µVRMS output noise and 80 dB VBIAS PSRR prevent data corruption during high-speed read/write cycles. |
| Camera Sensor Analog Front-End | STB HDMI Transmitter Power |
Use Scenario: Supplying analog supply (AVDD) to CMOS image sensors in mobile cameras where supply ripple induces fixed-pattern noise. IC Role / Device Role / Timing Role: Ultra-low-noise linear regulator filtering switching noise from main PMIC outputs. Use Value: 75 mV dropout enables operation from partially discharged batteries while maintaining 1.40 V AVDD for consistent image quality. |
Use Scenario: Providing clean 1.40 V supply to HDMI transmitter PHY blocks in set-top boxes, where EMI compliance depends on supply cleanliness. IC Role / Device Role / Timing Role: Final-stage regulator decoupling HDMI PHY from noisy digital SoC rails. Use Value: Active output discharge ensures rapid power-down of HDMI PHY during hot-plug detection, meeting CEC timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VLDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6214B142MR-G | Single-rail (VIN-only), no VBIAS; 1.4 V output, ±2.0% accuracy, 120 mV dropout at 150 mA | Lacks dual-rail noise isolation and active discharge; lower PSRR (60 dB) | Lower-cost option where bias rail sharing isn't required and noise sensitivity is moderate. |
| Richtek RT9013-14GB | Single-rail, 1.4 V output, ±2.0% accuracy, 150 mV dropout, no active discharge, 65 µA IQ | Smaller quiescent current but higher dropout and no VBIAS decoupling - unsuitable for ultra-low-VIN scenarios. | Preferred for ultra-low-power always-on rails where dropout >100 mV is acceptable and bias rail separation is unnecessary. |
Compared with Torex XC6214B142MR-G and Richtek RT9013-14GB, the NCP121AMX140TCG uniquely provides dual-rail operation for superior noise rejection, guaranteed 75 mV dropout, and active output discharge - making it the only choice for high-fidelity analog supply and fast-controlled power sequencing in premium portable devices.
Availability
NCP121AMX140TCG is available at Aetrix Electronics and suitable for smartphone processor core rails, tablet memory I/O supplies, camera sensor analog front-ends, and STB HDMI transmitter power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP121AMX140TCG 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, medical, and portable markets with power, analog, sensor, and connectivity solutions.
The NCP121AMX140TCG belongs to onsemi's high-accuracy VLDO regulator product line, designed specifically for noise-sensitive, space-constrained battery-powered applications demanding tight regulation, ultra-low dropout, and robust thermal performance in sub-2 mm² packages.
FAQ
What is the output voltage tolerance of the NCP121AMX140TCG over temperature and load?
The NCP121AMX140TCG guarantees ±1.0% output voltage accuracy across −40°C to +85°C junction temperature, full 1 mA to 150 mA load range, and input voltage from VOUT+VDO to 5.0 V. At 25°C only, accuracy tightens to ±0.2%, enabling precise voltage setting for sensitive digital cores without external calibration.
Does the NCP121AMX140TCG require an external bias supply, and what happens if VBIAS is out of spec?
Yes - the NCP121AMX140TCG requires a dedicated VBIAS supply between 2.4 V and 5.5 V, and must be ≥(VOUT + 1.35 V). If VBIAS falls below the UVLO threshold (1.6 V rising, 1.4 V falling), the regulator disables regardless of EN state. This ensures internal circuitry remains functional before enabling output regulation.
Is active output discharge available on the NCP121AMX140TCG, and how does it behave?
Yes - active output discharge is enabled only in NCP121A-series devices like the NCP121AMX140TCG. When EN is pulled low (≤0.4 V), an internal 150 Ω pull-down connects OUT to GND, discharging external capacitors rapidly. This prevents floating voltages that could cause latch-up or violate sequencing requirements in multi-rail systems.
What is the minimum input voltage required for the NCP121AMX140TCG to maintain regulation at 150 mA?
The NCP121AMX140TCG requires VIN ≥ 1.475 V at 150 mA load to maintain regulation, based on its maximum 75 mV dropout voltage. Below this, VOUT drops proportionally. For reliable operation across temperature and process variation, design with ≥1.5 V VIN minimum, especially when using single-cell Li-ion sources near end-of-discharge.
Can the NCP121AMX140TCG operate with a 1 µF ceramic output capacitor, and why is effective capacitance emphasized?
Yes - the NCP121AMX140TCG is fully stable with 1 µF effective ceramic output capacitance, verified across temperature and DC bias. Effective capacitance accounts for voltage coefficient (e.g., X5R/X7R caps lose >50% nominal value at rated voltage), so a 2.2 µF nominal 0402 X5R may deliver only ~1 µF at 1.4 V - confirming actual effective value is essential for stability.
NCP121AMX140TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-XFDFN 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):
- 1.4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.075V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 70dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-XDFN (1.2x1.2)
NCP121AMX140TCG FAQ
1.How can I place an order for NCP121AMX140TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP121AMX140TCG 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 NCP121AMX140TCG reliable?
The price and inventory of NCP121AMX140TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP121AMX140TCG is usually 5 days.
3.What payment methods are accepted for NCP121AMX140TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP121AMX140TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP121AMX140TCG?
NCP121AMX140TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP121AMX140TCG 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 NCP121AMX140TCG?
For technical support, including NCP121AMX140TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP121AMX140TCG requirements.
6.How does Aetrix verify that NCP121AMX140TCG is sourced from the original manufacturer or authorized distributors?
All NCP121AMX140TCG 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 NCP121AMX140TCG meets industry standards.
7.What is the process for return or replacement of NCP121AMX140TCG?
All NCP121AMX140TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP121AMX140TCG, 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 NCP121AMX140TCG part is unused and in its original packaging.
Return procedure for NCP121AMX140TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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