NCV551SN33T1G

onsemi NCV551SN33T1G — 3.3 V, 150 mA Automotive LDO Regulator (TSOP‑5)

The onsemi NCV551SN33T1G is a compact, automotive‑qualified low‑dropout (LDO) linear regulator that provides a regulated 3.3 V output at up to 150 mA. Part of the NCV551 family, this device targets power‑conditioning needs in modern vehicles and other harsh environments where reliability, tight output accuracy, and protection features are essential. Packaged in a space‑saving TSOP‑5 (SOT‑23‑5) and supplied in tape‑and‑reel (T1G) format, the NCV551SN33T1G is a pragmatic choice for instrument clusters, infotainment modules, body control units (BCUs), ECUs, and general point‑of‑load rails.

Engineers evaluating 3.3 V point‑of‑load solutions will appreciate the NCV551SN33T1G’s ±2% output accuracy and AEC‑Q100 pedigree, while buyers and sourcing managers benefit from an active lifecycle, RoHS compliance, and a straightforward commercial alternative for non‑automotive builds.

Why choose the NCV551SN33T1G?

• Automotive‑ready reliability: As an NCV‑prefix device, the onsemi NCV551SN33T1G is AEC‑Q100 qualified for automotive applications.
• Practical 3.3 V rail at 150 mA: A common logic and sensor supply, suitable for microcontrollers, transceivers, and mixed‑signal loads.
• Built‑in protections: Overcurrent limiting and thermal shutdown bolster system safety and simplify protection design.
• Small footprint: TSOP‑5 (SOT‑23‑5) package eases placement in dense PCBs and distributed power architectures.
• Clear sourcing path: Active lifecycle with a functionally equivalent commercial counterpart (NCP551SN33T1G) when automotive qualification isn’t required.

Key Features and Specifications

• Brand / Manufacturer: onsemi
• Series: NCV551
• Category: Linear Regulators (LDO)
• Regulator Type: Fixed LDO
• Output Voltage: 3.3 V (fixed)
• Maximum Output Current: 150 mA
• Output Accuracy: ±2%
• Automotive Qualification: AEC‑Q100
• Protection Features: Overcurrent protection; Thermal shutdown
• Operating Temperature Range: −40°C to +125°C
• Package: TSOP‑5 (SOT‑23‑5), 5 pins
• Mounting Type: Surface mount
• Packaging: Tape & Reel (T1G); seller pack: 10 pcs
• RoHS / Environmental: RoHS compliant; halogen‑free (as noted)
• Datasheet: https://www.onsemi.com/pdf/datasheet/ncp551-d.pdf

Notes on additional electrical details (see datasheet for design values):

• Dropout voltage: Not specified in the provided data (consult datasheet).
• Quiescent current: Not specified in the provided data (consult datasheet).
• PSRR / noise: Not specified in the provided data (consult datasheet).
• Input voltage range and absolute maximum ratings: Not specified in the provided data (consult datasheet).
• Enable/shutdown control or discharge behavior: Not specified in the provided data (consult datasheet).

These parameters can be option‑ or condition‑dependent within the NCV551/NCP551 family, so always confirm the exact figures in the latest onsemi datasheet before finalizing your design.

Applications and Use Cases

The onsemi NCV551SN33T1G is designed for widespread use in automotive and industrial systems that benefit from a clean, regulated 3.3 V rail at modest current levels:

• Automotive electronics
• Instrument clusters and driver information systems
• Infotainment head units, audio submodules, and telematics
• Body control modules (BCMs) and ECUs
• Door, seat, and HVAC controllers
• Lighting control interfaces and sensor nodes
• General purpose point‑of‑load regulation
• Local 3.3 V rails for MCUs, FPGAs, or ASIC I/O
• CAN/LIN transceivers and mixed‑signal peripherals
• Sensors, RF front ends, and small digital subsystems
• Always‑on standby rails in power‑managed designs

In practice, the NCV551SN33T1G frequently appears downstream of a vehicle battery pre‑regulator or a DC/DC converter to provide a quiet, accurate 3.3 V rail with integrated protection. The small footprint supports distributed regulation close to sensitive loads, reducing trace impedance and improving transient behavior.

Package, Footprint, and Layout Considerations

• Package: TSOP‑5 (SOT‑23‑5)
• Pin count: 5
• Mounting: Surface mount (SMT)
• Supply format: Tape & Reel (T1G)

Design and layout tips:

• Place input and output bypass capacitors as close as possible to the IC pins to minimize loop area.
• Use a solid ground reference and short, wide traces for ground and power to reduce parasitics.
• Ensure adequate thermal dissipation through copper planes or thermal vias as appropriate for the expected load and ambient conditions.
• Observe the datasheet‑recommended capacitor type, value, and ESR range for regulator stability across operating conditions.

Because this is a compact, thermally constrained package, verify power dissipation against worst‑case ambient temperature and load current. Confirm that board copper, airflow, and operating duty cycles keep the junction temperature within the specified range.

Reliability, Protections, and Operating Conditions

• Operating temperature: −40°C to +125°C supports harsh automotive and industrial environments.
• Overcurrent protection: Helps prevent damage during overload or short‑circuit events.
• Thermal shutdown: Protects the regulator and system by turning off the output if the device overheats.

When designing for reliability:

• Account for headroom above dropout across the full temperature and load range.
• Validate startup sequencing if the LDO feeds devices with inrush or bulk capacitance.
• Size input and output capacitors to the datasheet guidance to ensure loop stability and predictable transient response.

Automotive Compliance and Quality

• AEC‑Q100: The NCV551SN33T1G (NCV series) is automotive qualified.
• onsemi NCV family: The NCV prefix denotes parts intended for automotive use, manufactured and qualified to meet automotive requirements.

For programs that require automotive qualification, the NCV551SN33T1G provides a clear compliance path. For non‑automotive applications, a commercial counterpart simplifies cost and supply planning (see Replacements and Alternatives below).

Lifecycle, Supply, and Ordering

• Lifecycle status: Active (manufacturer: onsemi)
• Packaging: Tape & Reel (T1G); typical seller pack of 10 pcs
• Environmental compliance: RoHS compliant; halogen‑free (per notes)

Sourcing guidance:

• Plan for automotive documentation needs early (qualification evidence, CoC/CoO, RoHS statements). While PPAP details are not listed here, coordinate with your supplier as program requirements dictate.
• For designs where AEC‑Q100 is not mandatory, consider the commercial counterpart to mitigate lead‑time or cost pressure while maintaining functional parity.
• Keep approved alternates on the AVL to maintain schedule resilience.

Replacements and Alternatives

• Primary replacement (commercial grade): NCP551SN33T1G
• Compatibility: Functional equivalent (commercial grade).
• Notes: Non‑automotive alternative; verify all electrical parameters, deratings, and ordering codes against your design requirements.

Policy notes: For non‑automotive applications where AEC‑Q is not required, the NCP551SN33T1G is the recommended counterpart with similar electrical behavior. Always re‑validate thermal margins and stability with your chosen capacitors.

Design‑In Checklist

Use this quick checklist to accelerate successful integration of the onsemi NCV551SN33T1G:

• Confirm the input voltage range and headroom relative to dropout under worst‑case conditions (consult datasheet).
• Select input and output capacitors that meet the datasheet’s minimum value and ESR specifications across temperature and tolerance.
• Validate output accuracy at operating extremes of load and temperature to ensure compliance with ±2% budget.
• Check inrush, startup sequencing, and potential interaction with upstream DC/DC regulators or protection circuits.
• Verify thermal performance in enclosure: board copper allocation, proximity to heat sources, and airflow.
• If migrating from non‑automotive builds, re‑qualify with the NCV551SN33T1G as needed to meet AEC‑Q100 program requirements.

Compliance Summary

• AEC‑Q100: Automotive qualified (NCV series)
• RoHS: Compliant; Pb‑free; halogen‑free (as noted)

If your organization requires formal certificates or declarations, request the latest compliance documentation from your distributor or directly from onsemi.

Specifications at a Glance

• MPN: NCV551SN33T1G
• Brand: onsemi
• Series: NCV551
• Type: Fixed LDO regulator
• Output: 3.3 V, up to 150 mA
• Accuracy: ±2%
• Protections: Overcurrent, Thermal shutdown
• Temperature range: −40°C to +125°C
• Package: TSOP‑5 (SOT‑23‑5), 5 pins
• Mounting: Surface mount
• Packaging: Tape & Reel (T1G); seller pack: 10 pcs
• Compliance: AEC‑Q100, RoHS

Unspecified in the provided data (see datasheet): dropout voltage, quiescent current, PSRR, noise, input voltage range, and any enable/discharge specifics.

Frequently Asked Questions (FAQs)

Q: Is the onsemi NCV551SN33T1G automotive qualified?
A: Yes. NCV‑prefix parts are AEC‑Q100 qualified for automotive use.

Q: What is the package style for this part?
A: TSOP‑5 (also known as SOT‑23‑5), 5 leads, surface mount.

Q: What is the fixed output voltage and maximum output current?
A: The NCV551SN33T1G provides a fixed 3.3 V output and supports up to 150 mA load current.

Q: What protection features are integrated?
A: Overcurrent protection and thermal shutdown are included.

Q: What is the operating temperature range?
A: −40°C to +125°C.

Q: Is there a non‑automotive alternative?
A: Yes. The NCP551SN33T1G is a functional, commercial‑grade counterpart. Verify specifications and deratings before substitution.

Q: Is the NCV551SN33T1G RoHS compliant?
A: Yes. It is RoHS compliant and noted as halogen‑free.

Q: Where can I find detailed electrical characteristics like dropout voltage and quiescent current?
A: Refer to the official onsemi datasheet: https://www.onsemi.com/pdf/datasheet/ncp551-d.pdf

Resources

• Datasheet (onsemi): https://www.onsemi.com/pdf/datasheet/ncp551-d.pdf

If you require application guidance or layout review for the onsemi NCV551SN33T1G, consult the datasheet and your onsemi or distributor field engineering support. Careful capacitor selection and thermal verification will ensure stable operation and long‑term reliability in both automotive and industrial environments.