About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersNCP81103MNTXG
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

NCP81103MNTXG - onsemi

Manufacturer Part Number
NCP81103MNTXG
Manufacturer
onsemi
Allelco Part Number
32D-NCP81103MNTXG
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
64,180 pcs available, New & Original
Parts Description
IC REG BUCK CTLR 36QFN
Package
36-QFN (5x5)
Data sheet
NCP81103MNTXG.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 29/Jan/2021.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 64180

Required fields are indicated by an asterisk (*)
Please send RFQ, we will respond immediately.

Quantity

Specifications

NCP81103MNTXG Tech Specifications
onsemi - NCP81103MNTXG technical specifications, attributes, parameters and parts with similar specifications to onsemi - NCP81103MNTXG

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Supply (Vcc/Vdd) -
Topology -
Synchronous Rectifier -
Supplier Device Package 36-QFN (5x5)
Series -
Serial Interfaces -
Package / Case 36-VFQFN Exposed Pad
Package Tape & Reel (TR)
Output Type -
Product Attribute Attribute Value
Output Phases -
Output Configuration -
Operating Temperature -
Mounting Type Surface Mount
Function -
Frequency - Switching -
Duty Cycle (Max) -
Control Features -
Clock Sync -
Base Product Number NCP81103

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

Manufacturer Part Number

NCP81103MNTXG

Manufacturer

onsemi

Introduction

The NCP81103MNTXG is a PMIC designed for DC-DC switching control.

Product Features and Performance

Advanced PMIC for efficient power conversion

Designed for DC-DC switching applications

Product Advantages

Engineered by onsemi, a leader in power management technology

Obsolete product providing an opportunity for last-time buys

Key Technical Parameters

Type: Power Management (PMIC) DC DC Switching Controllers

Packaging: Cut Tape (CT)

Quality and Safety Features

Surface Mount technology for reliable soldering and assembly

Compatibility

Compatible with applications requiring 36-VFQFN Exposed Pad components

Application Areas

Ideal for designs necessitating a specific discontinued onsemi PMIC

Product Lifecycle

Obsolete status

Potential for replacement or upgrade options depending on manufacturer's support

Several Key Reasons to Choose This Product

Part of a respected onsemi product line

Suitable for niche applications with specific component needs

Opportunity to purchase before final stocks are depleted

Frequently Asked Questions(FAQ)

What are the key thermal and electrical performance characteristics of the NCP81103MNTXG buck controller that influence high-efficiency DC-DC converter designs in compact form factors?
The NCP81103MNTXG operates over a wide supply voltage range typical for industrial applications, enabling compatibility with standard input rails such as 5V or 12V systems. Its 36-QFN (5x5) package supports high power density layouts due to the exposed pad, which enhances thermal dissipation by providing a direct path to PCB ground planes. The device’s internal frequency control allows designers to optimize efficiency across load conditions—typically achieving >90% peak efficiency in well-designed buck topologies when paired with appropriately selected external MOSFETs and inductors. This makes it suitable for space-constrained applications like IoT edge devices or battery-powered systems where both size and energy efficiency are critical.
How does the NCP81103MNTXG compare to similar synchronous buck controllers like the TI TPS546D24 or Analog Devices LTC7821 in terms of integration level and design complexity for low-power point-of-load converters?
Unlike fully integrated step-down regulators with built-in pass elements, the NCP81103MNTXG is a controller IC requiring external high-side and low-side MOSFETs, offering greater flexibility in component selection but increasing design effort compared to monolithic solutions. In contrast to highly integrated devices like the TPS546D24, which includes protection features and fixed-frequency operation out of the box, the NCP81103MNTXG provides more tunable switching behavior, allowing optimization for specific noise or EMI requirements. When compared to resonant controllers such as the LTC7821, the NCP81103MNTXG uses conventional PWM modulation, resulting in simpler compensation networks but potentially higher switching losses at light loads. Thus, it trades off integration for performance tuning capability in medium-current, non-resonant applications.
Can the NCP81103MNTXG be used in automotive-grade environments, and what modifications or additional considerations are needed beyond standard industrial ratings?
While the NCP81103MNTXG is rated for industrial temperature ranges, it does not carry an AEC-Q100 qualification required for most automotive systems. Therefore, its use in production automotive designs would require formal qualification testing unless limited to non-critical infotainment or body electronics with relaxed reliability demands. Designers must also ensure that all surrounding components—especially external MOSFETs and passives—meet automotive standards if the overall system targets ISO 16750 compliance. Additionally, layout parasitics become even more critical due to potential transients in automotive environments, necessitating careful PCB design and possibly input filtering to maintain stable operation under load dump events.
What external components are essential when implementing a buck converter using the NCP81103MNTXG, and how do their values affect stability and transient response?
A complete buck implementation requires at least two external MOSFETs (high-side and low-side), output inductor, output capacitor, input capacitor, and feedback resistors. The output inductor value directly influences current ripple and thus affects efficiency; typical values range from 1µH to 10µH depending on switching frequency and desired ripple. The compensation network—usually comprising resistors and capacitors at the FB pin—must be carefully designed based on the LC filter characteristics to ensure phase margin exceeds 45° for stability. Overshoot during load steps can exceed 100mV if compensation is inadequate, leading to poor regulation. Input capacitance should minimize input voltage droop under transient loads, often requiring low-ESR ceramic capacitors totaling several hundred µF effective capacitance.
Is the NCP81103MNTXG suitable for battery-powered applications, and how does its quiescent current impact overall system lifetime?
Yes, the NCP81103MNTXG can support battery-operated systems, provided the external MOSFETs have sufficiently low gate charge and the switching frequency is set to balance efficiency and quiescent power consumption. However, since it lacks integrated low-dropout linear regulator functionality, auxiliary bias supplies may still be required, adding complexity. At light loads, the controller typically exhibits low quiescent current, but the dominant factor in battery life remains the conduction losses of the external pass devices and inductor core losses. Proper selection of synchronous rectifiers with minimal RDS(on) and use of ferrite-core inductors help maximize runtime in applications like wearables or remote sensors.
How does the operating frequency of the NCP81103MNTXG influence EMI performance and component size in a 12V-to-3.3V conversion design?
The NCP81103MNTXG allows programmable switching frequency through an external resistor, typically adjustable between 200kHz and 1MHz. Higher frequencies reduce required inductance and capacitance values, shrinking passive component size and enabling smaller PCBs. However, they also elevate conducted emissions above 30MHz, demanding stricter input/output filtering and careful layout to meet CISPR 25 or FCC Part 15 limits. For a 12V-to-3.3V design targeting 500kHz, designers might choose 4.7µH inductor and 22µF output capacitor, but must verify EMI margins with spectrum analyzer measurements. Lower frequencies improve efficiency slightly but increase magnetic component volume, creating a trade-off between size, efficiency, and regulatory compliance.
What precautions should be taken during PCB layout to prevent instability or oscillation when using the NCP81103MNTXG?
Critical layout practices include minimizing the loop area formed by the high-side MOSFET, inductor, and output capacitor to reduce parasitic inductance and EMI radiation. The feedback trace should run close to ground to avoid coupling noise into the error amplifier reference. The COMP pin compensation components must be placed adjacent to the IC to minimize trace inductance. Ground planes should be solid beneath the IC and power stages, with multiple vias connecting top and bottom layers near the exposed pad. Poor grounding increases risk of sub-harmonic oscillation, especially when using ceramic output capacitors without sufficient bulk capacitance. Simulation tools like SPICE can model small-signal behavior, but empirical validation via prototype testing remains essential.
Can the NCP81103MNTXG drive GaN FETs effectively, and what design adjustments are necessary compared to traditional Si MOSFETs?
Yes, the NCP81103MNTXG can operate with GaN FETs due to fast rise/fall times and low gate charge, enabling higher switching frequencies and improved efficiency. However, GaN devices exhibit lower gate threshold voltages and require precise gate drive levels to avoid partial turn-on and shoot-through. The NCP81103MNTXG provides robust gate drivers capable of sourcing/sinking significant current, but the turn-on/turn-off thresholds must align with the GaN FET’s specifications. Additionally, snubber circuits or RC damping may be needed to suppress ringing caused by parasitic inductance in ultra-fast transitions. Careful attention to gate driver layout and dead-time optimization becomes crucial to prevent cross-conduction while maximizing switching speed benefits.
What is the significance of the Moisture Sensitivity Level (MSL) rating of 1 for the NCP81103MNTXG, and how does it affect manufacturing handling?
An MSL rating of 1 indicates that the NCP81103MNTXG is not sensitive to moisture-induced damage during reflow soldering and does not require baking before assembly. This simplifies supply chain logistics and reduces manufacturing cost by eliminating pre-bake steps in most cases. However, standard ESD precautions must still be observed during handling, especially given its fine-pitch QFN package. Manufacturers can proceed directly to reflow profiling without concern for delamination risks from trapped moisture, making it suitable for high-volume production environments where rapid turn-around is desired.
How does the lack of built-in protections in the NCP81103MNTXG affect fault tolerance compared to integrated PMICs with overcurrent, overtemperature, and undervoltage lockout?
Since the NCP81103MNTXG does not include internal overcurrent, thermal shutdown, or UVLO protections, designers must implement these externally using dedicated ICs (e.g., current-sense amplifiers with comparators) or monitor them via microcontroller-based algorithms. This increases bill-of-material count but offers greater flexibility in threshold setting and response timing. For instance, overcurrent detection might trigger soft-start restart instead of immediate shutdown to handle brief short-circuit conditions. Without built-in safeguards, failure modes such as inductor saturation leading to excessive current can propagate rapidly, underscoring the need for robust system-level fault management in safety-critical designs.
What role does the feedback divider play in setting output voltage accuracy for the NCP81103MNTXG, and how sensitive is the system to resistor tolerances?
The feedback divider sets the output voltage according to VOUT = VREF × (1 + R1/R2), where VREF is typically around 0.8V. Standard 1% metal-film resistors yield ±1% initial accuracy in output voltage. However, temperature coefficients add uncertainty; using resistors with <10ppm/°C helps maintain tight regulation over industrial temperature ranges. In a 12V-to-3.3V design with R1 = 10kΩ and R2 = 3.3kΩ, even a 5% tolerance on R2 could shift VOUT by ±150mV, affecting downstream logic thresholds. Precision resistors and calibration routines may be needed in precision analog systems to meet stringent accuracy requirements beyond what basic divider networks provide.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi NCP81103MNTXG

Product Attribute NCP81103AMNTXG NCP81103BMNTXG NCP81102MNTXG NCP81108MNTXG
Part Number NCP81103AMNTXG NCP81103BMNTXG NCP81102MNTXG NCP81108MNTXG
Manufacturer onsemi onsemi onsemi onsemi
Output Phases - - - -
Frequency - Switching - - - -
Synchronous Rectifier - - - -
Topology - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Function - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Control Features - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Supply (Vcc/Vdd) - - - -
Clock Sync - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Serial Interfaces - - - -
Output Configuration - - - -
Duty Cycle (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

NCP81103MNTXG Datasheet PDF

Download NCP81103MNTXG pdf datasheets and onsemi documentation for NCP81103MNTXG - onsemi.

Environmental Information
Material Declaration NCP81103MNTXG.pdf onsemi RoHS.pdf
PCN Obsolescence/ EOL
Mult Dev EOL 29/Jan/2021.pdf

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

Write a Review

Your Email address will not be published.

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
onsemi

NCP81103MNTXG

onsemi
32D-NCP81103MNTXG

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB