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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearNCV551SN31T1G
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NCV551SN31T1G - onsemi

Manufacturer Part Number
NCV551SN31T1G
Manufacturer
onsemi
Allelco Part Number
32D-NCV551SN31T1G
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,250 pcs available, New & Original
Parts Description
IC REG LINEAR 3.1V 150MA 5TSOP
Package
5-TSOP
Data sheet
NCV551SN31T1G.pdf

Datasheets

NCP, NCV551.pdf

PCN Assembly/Origin

Epoxy 03/Mar/2019.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 08/Jul/2021.pdf

HTML Datasheet

NCP, NCV551.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 7250

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Specifications

NCV551SN31T1G Tech Specifications
onsemi - NCV551SN31T1G technical specifications, attributes, parameters and parts with similar specifications to onsemi - NCV551SN31T1G

Product Attribute Attribute Value
Manufacturer onsemi
Voltage Dropout (Max) 0.15V @ 10mA
Voltage - Output (Min/Fixed) 3.1V
Voltage - Output (Max) -
Voltage - Input (Max) 12V
Supplier Device Package 5-TSOP
Series Automotive, AEC-Q100
Protection Features Over Current, Over Temperature
Package / Case SOT-23-5 Thin, TSOT-23-5
Package Tape & Reel (TR)
PSRR -
Product Attribute Attribute Value
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 8 µA
Current - Quiescent (Iq) 8 µA
Current - Output 150mA
Control Features Enable
Base Product Number NCV551

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

NCV551SN31T1G Image
NCV551SN31T1G (1)

Manufacturer Part Number

NCV551SN31T1G

Manufacturer

onsemi

Introduction

The NCV551SN31T1G is a low-dropout (LDO) linear voltage regulator from onsemi. It is designed to provide a stable and reliable 3.1V output voltage from an input voltage of up to 12V, making it suitable for a wide range of applications.

Product Features and Performance

Fixed 3.1V output voltage

Low dropout voltage of 0.15V at 10mA

Output current capability of up to 150mA

Quiescent current of only 8μA

Over-current and over-temperature protection

Compact SOT-23-5 or TSOT-23-5 package

Product Advantages

Efficient power conversion with low power loss

Reliable operation in harsh environments

Small footprint for space-constrained designs

Robust protection features for added safety

Key Reasons to Choose This Product

Provides a stable and regulated output voltage for your application

Optimized for low power consumption and extended battery life

Proven reliability and performance in automotive and industrial applications

Easy to integrate and simplify your power supply design

Quality and Safety Features

Qualified to the AEC-Q100 automotive standard

Robust protection against overcurrent and overtemperature conditions

Designed and manufactured to the highest quality standards

Compatibility

The NCV551SN31T1G is compatible with a wide range of electronic systems and devices that require a stable 3.1V power supply.

Application Areas

Automotive electronics

Industrial control systems

Consumer electronics

Telecommunications equipment

Portable devices and wearables

Product Lifecycle

The NCV551SN31T1G is currently an obsolete product. However, onsemi offers several equivalent or alternative LDO voltage regulator models that can be used as drop-in replacements. Customers are advised to contact our website's sales team for more information on available alternatives and to ensure the suitability of the replacement for their specific application.

Frequently Asked Questions(FAQ)

What is the typical dropout voltage for the NCV551SN31T1G at moderate load current, and how does this affect system efficiency in battery-powered automotive applications?
The NCV551SN31T1G exhibits a maximum dropout voltage of 0.15V when delivering 10mA of output current. This low dropout characteristic enables efficient operation in automotive systems where input voltages can dip close to the regulated level during cold crank events or transient loads. With a fixed 3.1V output and an 8µA quiescent current, the device maintains reasonable efficiency across light-load conditions common in always-on sensor nodes or infotainment subsystems.
How does the NCV551SN31T1G compare to adjustable regulators like the NCV8718AMTADJTBG in terms of bill of materials cost and space constraints for automotive-grade linear regulation?
The NCV551SN31T1G offers a simpler design solution with a fixed 3.1V output, eliminating the need for external resistor dividers required by adjustable regulators such as the NCV8718AMTADJTBG. This reduces component count, board space, and potential failure points. For applications where 3.1V is precisely the required rail—such as powering specific logic families or analog front-ends—the integrated fixed output minimizes BOM complexity while maintaining AEC-Q100 qualification essential for automotive use.
What are the key protection mechanisms implemented in the NCV551SN31T1G, and how do they enhance reliability in harsh automotive environments?
The NCV551SN31T1G integrates overcurrent and overtemperature protection circuits that actively monitor internal power dissipation and output load conditions. In automotive environments subject to voltage transients, temperature extremes (-40°C to +125°C), and potential short-circuit scenarios, these features prevent catastrophic failure by limiting current flow or disabling the regulator during thermal overload. This built-in robustness reduces reliance on external protection circuitry, simplifying fault management in safety-critical systems.
Can the NCV551SN31T1G operate reliably from a 12V automotive supply without additional pre-regulation filtering?
Yes, the NCV551SN31T1G is rated for inputs up to 12V, making it suitable for direct connection to unregulated 12V automotive buses such as those found in legacy vehicle architectures. However, due to its 0.15V dropout at 10mA, sustained input voltages near or below 3.25V may cause regulation instability. While basic functionality is maintained under transient 12V conditions, robust EMC performance typically requires minimal input capacitance and consideration of load dump protection per ISO 7637-2 standards.
What is the impact of the 8µA quiescent current on battery life in a 12V-to-3.1V automotive sensor node powered by a lead-acid battery?
With only 8µA of quiescent current (IQ), the NCV551SN31T1G contributes minimally to standby power consumption in automotive applications where devices must remain operational during long parking periods. Assuming a 5Ah lead-acid battery with 50% depth of discharge and no other loads, the IQ alone would draw approximately 1.92mAh per year—negligible compared to self-discharge rates. This low leakage supports energy-efficient wake-up strategies and extends diagnostic readiness without frequent maintenance charging.
Is the NCV551SN31T1G suitable for use in functional safety-related automotive subsystems according to ISO 26262?
While the NCV551SN31T1G is AEC-Q100 qualified and operates over the full automotive temperature range, it does not carry formal ISO 26262 ASIL certification. Its role as a non-safety-isolated power supply component may be acceptable in ASIL-B or lower applications where single-point failure metrics are managed through architectural diversity. Designers must conduct a Failure Mode and Effects Analysis (FMEA) to determine if additional mitigation layers—such as redundancy or watchdog monitoring—are required for safety-critical functions.
How does the SOT-23-5 package of the NCV551SN31T1G influence thermal performance in compact automotive ECUs?
The 5-TSOP (SOT-23-5) package provides adequate thermal conduction for the NCV551SN31T1G’s 150mA output capability under most continuous load conditions. However, in high ambient temperatures near 125°C with sustained full-load operation, junction-to-ambient thermal resistance may necessitate careful PCB copper area allocation or airflow considerations. For typical intermittent loads below 100mA, natural convection cooling suffices, enabling dense integration in space-constrained head units or body control modules.
What external components are minimally required to implement a stable 3.1V rail using the NCV551SN31T1G?
At minimum, two ceramic capacitors—one on the input (typically 1µF) and one on the output (also 1µF)—are recommended to ensure stability across all operating conditions. These should be placed as close as possible to the IC pins to minimize parasitic inductance. No feedback resistors are needed due to the fixed output configuration, simplifying layout and reducing component sourcing risk in high-volume production.
How does the enable pin on the NCV551SN31T1G facilitate power sequencing in multi-voltage automotive systems?
The active-high enable pin allows external microcontrollers or supervisory ICs to control the regulator’s activation based on system state. This enables precise power sequencing where downstream components require the 3.1V rail to settle before higher-current peripherals engage. During shutdown, the device draws only 8µA, preserving battery reserve while allowing deterministic turn-on timing critical for fail-safe behaviors in ADAS or telematics platforms.
In what ways does the NCV551SN31T1G differ from switching regulators in noise-sensitive analog applications?
Unlike switching regulators, the NCV551SN31T1G provides inherently low output ripple and electromagnetic interference (EMI), benefiting precision analog circuits such as Hall-effect sensors or RF front-ends. Its linear regulation avoids high-frequency switching artifacts that can couple into sensitive signals. However, this comes at the cost of reduced efficiency under large input-to-output differentials—making it ideal for low-power, low-noise rails rather than high-current digital loads.
Can the NCV551SN31T1G tolerate reverse polarity events commonly encountered in automotive wiring harnesses?
The NCV551SN31T1G does not include internal reverse-polarity protection. Exposure to reversed input voltage could damage the device unless external diodes or MOSFET-based clamps are added. Automotive designs often incorporate Schottky diode protection at the input or use series pass elements with integrated reverse blocking; however, such measures increase forward voltage drop and reduce efficiency slightly.
What role does the MSL 1 classification play in the manufacturing and handling lifecycle of the NCV551SN31T1G?
MSL 1 indicates the NCV551SN31T1G is moisture-insensitive and can be stored indefinitely without baking before reflow soldering. This simplifies inventory management in automotive supply chains where just-in-time delivery and long storage cycles are common. It also reduces processing steps during assembly, lowering cost and defect risk associated with moisture-induced popcorning in humid environments.
How does the base product number NCV551 relate to derivative variants like the SN31T1G, and what design implications arise from selecting a specific version?
All variants under the NCV551 family share core architecture but differ in output voltage and packaging. The NCV551SN31T1G delivers a fixed 3.1V output in a 5-pin TSOT-23 package. Choosing this variant implies a design dependency on exact voltage levels, whereas adjustable versions offer flexibility. Migration between variants requires reassessment of stability margins, dropout behavior, and compatibility with existing PCB footprints and load requirements.
What testing protocols validate the reliability claims of the NCV501SN31T1G under accelerated aging conditions?
As an AEC-Q100 Grade 1 device, the NCV551SN31T1G undergoes rigorous qualification including HBM/MM/CDM ESD testing, power cycling, temperature cycling (-40°C to +125°C), and unbiased HTOL (High Temperature Operating Life) tests lasting thousands of hours. These ensure consistent performance over the expected 15-year automotive service life, even under thermal stress and vibration typical in engine bay or chassis-mounted modules.
When might the NCV551SN31T1G be preferred over a Zener-based shunt regulator for generating reference voltages?
The NCV551SN31T1G offers superior line and load regulation compared to Zener diodes, which exhibit poor output impedance and sensitivity to input variations. For a stable 3.1V rail driving multiple loads or feeding ADC references, the regulator’s 8µA IQ and low dropout provide predictable performance across temperature and supply swings. Shunt regulators waste excess power as heat and lack enable/disable control, making them unsuitable for dynamic power management.
How does the absence of PSRR specification in the NCV551SN31T1G affect its suitability for noise-sensitive applications?
Linear regulators generally exhibit high PSRR at low frequencies, but the NCV551SN31T1G’s datasheet omits quantitative PSRR data, indicating limited characterization beyond basic functionality. In applications requiring suppression of high-frequency noise from the 12V rail (e.g., near switching converters), additional filtering may be necessary despite the device’s low intrinsic ripple. This makes it better suited for moderate-noise environments rather than ultra-low-noise analog signal paths without supplemental LC networks.
What are the implications of the RoHS 3 and REACH compliance status for global automotive supply chain traceability?
The NCV551SN31T1G meets RoHS 3 Directive 2011/65/EU, excluding hazardous substances like lead, cadmium, and mercury above threshold limits. Its REACH Unaffected status confirms no SVHCs (Substances of Very High Concern) are intentionally used in significant quantities. This ensures adherence to international regulations across major markets (EU, China, Korea) and simplifies export documentation, reducing legal and logistical friction in global tier-1 supplier ecosystems.
How should designers evaluate substitution candidates when replacing the NCV551SN31T1G in existing automotive designs?
Substitution must prioritize electrical compatibility: matching output voltage (±2%), dropout characteristics, IQ, package footprint, and AEC-Q100 qualification. Candidates like the NCV8718AMTADJTBG offer adjustability but require external resistors and have higher IQ (~30µA). Thermal derating curves, ESD robustness, and manufacturer reliability ratings should also be cross-referenced. Functional verification under actual vehicle operating profiles—including cold start and load dump—is essential to avoid field failures post-production.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi NCV551SN31T1G

Product Attribute NCV551SN33T1G NCV551SN33T1G-22523Z NCV551SN18T1G NCV551SN36T1G
Part Number NCV551SN33T1G NCV551SN33T1G-22523Z NCV551SN18T1G NCV551SN36T1G
Manufacturer onsemi onsemi onsemi onsemi
Current - Output - - - -
Voltage - Output (Max) - - - -
Number of Regulators - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input (Max) - - - -
Current - Supply (Max) - - - -
Output Configuration - - - -
Current - Quiescent (Iq) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Output (Min/Fixed) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Control Features - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Protection Features - - - -
Voltage Dropout (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
PSRR - - - -

NCV551SN31T1G Datasheet PDF

Download NCV551SN31T1G pdf datasheets and onsemi documentation for NCV551SN31T1G - onsemi.

Datasheets
NCP, NCV551.pdf
PCN Assembly/Origin
Epoxy 03/Mar/2019.pdf
Environmental Information
Material Declaration NCV551SN31T1G.pdf onsemi REACH.pdf onsemi RoHS.pdf
PCN Obsolescence/ EOL
Mult Dev EOL 08/Jul/2021.pdf
HTML Datasheet
NCP, NCV551.pdf
PCN Design/Specification
NCP551,NCV551 Datasheet Update 28/May/2014.pdf

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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.

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NCV551SN31T1G Image

NCV551SN31T1G

onsemi
32D-NCV551SN31T1G

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