onsemi NCV4266-2CST50T3G: 5 V, 150 mA Automotive LDO in SOT‑223 (3+Tab)
The onsemi NCV4266-2CST50T3G is a robust, automotive-grade low dropout (LDO) linear regulator designed to deliver a regulated 5 V output at up to 150 mA. Housed in a thermally capable SOT‑223 4‑lead (3+Tab) package and qualified to AEC‑Q100, this device targets automotive ECUs, body and infotainment modules, and any embedded system that requires a clean, reliable 5 V rail. The “G” suffix indicates a RoHS-compliant, Pb‑free build, and the “T3” designator denotes tape-and-reel packaging for automated assembly lines.
Why this part stands out
- Fixed 5 V output for straightforward 5 V rail generation
- 150 mA continuous output current for sensors, microcontrollers, and low‑power peripherals
- Automotive qualification (AEC‑Q100) supports use in production vehicles
- SOT‑223 (3+Tab) package balances footprint, thermal performance, and cost
- Tape & Reel packaging simplifies high‑volume SMT production
Key Specifications and Features
- Regulator type: Low Dropout (LDO)
- Output voltage: 5 V (fixed)
- Maximum output current: 150 mA
- Number of outputs: 1
- Output type: Fixed
- Automotive qualification: AEC‑Q100
- Package: SOT‑223, 4‑Lead (3+Tab)
- Mounting type: Surface mount
- Pin count: 4
- RoHS status: RoHS Compliant (G suffix indicates Pb‑free)
- Series: NCV4266
Not specified in provided summary (refer to datasheet):
- Input voltage range
- Dropout voltage at various load currents
- Quiescent current (IQ) and ground current
- PSRR vs. frequency and load
- Output noise and startup behavior
- Thermal resistance metrics (θJA/θJC) and thermal shutdown thresholds
- Recommended input/output capacitor values and ESR ranges
Resources:
- Datasheet: https://www.onsemi.com/pdf/datasheet/ncv4266-d.pdf
- Product page: https://www.onsemi.com/products/power-management/linear-regulators-ldo/ncv4266
Application Fit: Where the NCV4266-2CST50T3G Works Best
The onsemi NCV4266-2CST50T3G is optimized for the kinds of power rails that dominate automotive and embedded designs:
- Automotive electronics: Body control modules, infotainment subsystems, instrument clusters, telematics, and gateways often need a stable 5 V for logic, analog front‑ends, and transceivers.
- ECUs and microcontroller supplies: Many MCUs and their peripheral networks still rely on a dependable 5 V rail for operation, protection, and signal conditioning.
- Sensor and actuator power rails: 5 V sensors, low‑power actuators, and signal‑conditioning blocks benefit from the regulator’s simplicity and predictable behavior.
- General embedded 5 V conditioning: Wherever a clean 5 V line is required from an upstream source (e.g., a 12 V battery domain through pre‑regulation), a 150 mA LDO is a pragmatic building block.
Because it’s an LDO, the NCV4266‑2CST50T3G is particularly attractive when:
- You need low ripple/noise compared with many switching regulators
- Your load current is modest (≤150 mA)
- The input‑to‑output headroom and thermal budget are acceptable for a linear conversion stage
- Design simplicity, BOM count, and cost are priorities
Package, Footprint, and Thermal Considerations
The NCV4266‑2CST50T3G comes in a SOT‑223 4‑lead (3+Tab) package suitable for surface‑mount assembly. The package offers:
- Compact footprint for dense automotive PCBs
- Exposed tab for heat spreading into the PCB copper
- Straightforward pick‑and‑place handling in tape‑and‑reel form (T3)
Tips for layout and assembly:
- Follow the datasheet’s recommended land pattern to ensure solderability and thermal performance.
- Use wide copper pours or thermal vias under the tab region (as recommended in the datasheet) to reduce junction temperature.
- Observe creepage/clearance rules applicable to your automotive or industrial environment.
- Confirm the tab’s electrical potential in the pinout section of the datasheet before tying it to ground or any net.
Thermal and electrical ratings not detailed in this summary should be obtained from the datasheet, including thermal resistance numbers and any derating curves that relate output current to ambient temperature and copper area.
Design‑In Guidance
While exact numeric values must come from the datasheet, the following general principles help ensure a robust implementation:
- Input supply and filtering: Provide a local input capacitor near the regulator’s input pin. Choose value and ESR within datasheet guidelines. In automotive systems, upstream transient suppression (e.g., TVS diodes, pre‑regulation) is often required.
- Output stability: LDO stability depends on output capacitor value and ESR. Use the datasheet’s recommended capacitor type and range to guarantee loop stability across temperature and load.
- Transient response: If the load exhibits rapid current steps (e.g., radios, communication modules), choose output capacitors and layout that meet transient performance requirements specified in the datasheet.
- Thermal headroom: Linear regulators dissipate power as (VIN − VOUT) × IOUT. Estimate worst‑case power dissipation and confirm the PCB copper area can keep junction temperature within safe limits.
- Start‑up and sequencing: If multiple rails are sequenced, verify start‑up characteristics and any enable/reset behavior needed for your system. Consult the datasheet for timing graphs and pin functions.
- Protection features: LDOs commonly include thermal shutdown and short‑circuit/over‑current protection. Confirm available protections and their thresholds in the datasheet and validate them against your safety goals.
Compliance and Reliability
- Automotive qualification: AEC‑Q100. This supports use in automotive environments subject to temperature extremes and vibration/EMC considerations.
- Environmental compliance: RoHS Compliant; the “G” suffix denotes Pb‑free manufacturing.
- onsemi automotive portfolio: The NCV4266 family is part of onsemi’s automotive‑grade power management line, developed for long‑term availability and consistent quality.
If your application requires a particular AEC‑Q100 grade (e.g., Grade 0/1/2/3), consult the datasheet and product page for exact grade and operating temperature details (not specified in this summary).
Lifecycle, Sourcing, and Ordering
- Lifecycle status: Active (per provided data; always confirm on the onsemi product page for the latest status).
- Ordering code: NCV4266‑2CST50T3G
- 2CST50: Identifies the fixed 5 V option within the NCV4266 series
- T3: Tape‑and‑reel packaging for automated assembly
- G: Pb‑free, RoHS‑compliant
- Packaging: Tape & Reel (TR) for high‑volume SMT processes
Sourcing best practices:
- Verify real‑time availability and lead times with your preferred distributors or the manufacturer’s authorized channels.
- If the NCV4266‑2CST50T3G is temporarily constrained, review the NCV4266 product family for compatible variants (e.g., different ordering codes, package options, or output voltages). Only substitute after confirming pinout and electrical compatibility in the datasheet.
- For PPAP or automotive compliance documentation, work with onsemi or authorized distribution to obtain the latest qualification reports.
System‑Level Benefits
Choosing the onsemi NCV4266‑2CST50T3G for your 5 V rail can help you:
- Reduce design risk: AEC‑Q100 qualification and a mature LDO architecture lower surprises late in validation.
- Simplify the BOM: Fixed 5 V output with one channel means fewer configuration components.
- Improve EMC behavior: LDOs typically generate less conducted and radiated noise than switchers, easing EMC testing.
- Speed manufacturing: SOT‑223 (3+Tab) is easy to assemble and rework; tape‑and‑reel packaging fits seamlessly into SMT lines.
Practical Use Cases
- Body electronics: Powering microcontrollers, low‑current actuators, LIN/CAN transceivers that specify 5 V rails.
- Infotainment: Supplying codec ICs, audio preamps, logic translators, and small displays where low noise is beneficial.
- Sensing front‑ends: Providing clean 5 V to pressure, position, or temperature sensors and their analog signal chains.
- General embedded: Stabilizing a 5 V peripheral rail from a pre‑regulated 6–12 V domain in industrial controls or robotics.
What’s Not in This Summary (Check the Datasheet)
To complete your design, consult the datasheet for the following parameters (not specified in this summary):
- Absolute maximum ratings and safe operating area
- Recommended operating conditions (including VIN range)
- Dropout voltage versus load current and temperature
- Quiescent current (IQ), ground current, and shutdown currents
- PSRR across frequency and load conditions
- Output noise density or integrated output noise
- Protection features and thresholds (current limit, thermal shutdown)
- Enable/reset behavior and any diagnostic pins
- Capacitor requirements: minimum values, ESR ranges, and stability notes
- Thermal performance and derating with PCB copper area
Datasheet: https://www.onsemi.com/pdf/datasheet/ncv4266-d.pdf
Frequently Asked Questions (FAQs)
What is the nominal output and current capability?
- The NCV4266‑2CST50T3G provides a fixed 5 V output with up to 150 mA load current.
Is the NCV4266‑2CST50T3G suitable for automotive applications?
- Yes. It is AEC‑Q100 qualified and intended for automotive use.
How many outputs does this regulator have?
- One regulated output.
What package does it use and how is it supplied?
- SOT‑223 4‑lead (3+Tab) package; supplied in Tape & Reel (T3) for automated SMT.
Is it RoHS compliant?
- Yes. The “G” suffix indicates a Pb‑free, RoHS‑compliant variant.
What if I need different output voltages or features?
- Explore the onsemi NCV4266 family on the product page to find related ordering codes and variants. Always validate pin compatibility and electrical parameters in the datasheet before substituting.
Can I use it behind a switching pre‑regulator?
- Commonly, yes. Designers often pair a DC‑DC pre‑regulator with an LDO like the NCV4266‑2CST50T3G to achieve low noise at the point of load. Ensure the pre‑regulator’s output stays within the LDO’s allowable VIN range and that thermal dissipation remains within limits.
What capacitor values should I use on input and output?
- Follow the datasheet’s recommended capacitance and ESR ranges to ensure loop stability and transient performance. Exact values are not specified in this summary.
Summary and Next Steps
The onsemi NCV4266‑2CST50T3G is a practical, automotive‑qualified 5 V, 150 mA LDO regulator in a compact SOT‑223 package. It strikes a balance of simplicity, reliability, and manufacturability—ideal for powering microcontrollers, sensors, and low‑power peripherals in automotive ECUs and embedded systems. With AEC‑Q100 qualification and RoHS compliance, it meets common regulatory and reliability expectations, while tape‑and‑reel packaging supports efficient, high‑volume SMT assembly.
To finalize your design, download the datasheet and verify electrical limits (VIN range, dropout voltage, IQ, PSRR), capacitor requirements, thermal performance, and protection features. For sourcing, use the full ordering code NCV4266‑2CST50T3G and consult the onsemi product page for lifecycle status, family variants, and the latest availability information.
- Product page: https://www.onsemi.com/products/power-management/linear-regulators-ldo/ncv4266
- Datasheet: https://www.onsemi.com/pdf/datasheet/ncv4266-d.pdf