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onsemi NCV551SN31T1G
- Part No.:
- NCV551SN31T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCV551SN31T1G.pdf
- Description:
- IC REG LINEAR 3.1V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
NCV551SN31T1G from onsemi is an automotive-grade, fixed-output 3.1 V low-dropout linear regulator with PMOS pass transistor, 4.0 µA typical quiescent current, ±2.0% output voltage accuracy over −40 °C to +125 °C, and 150 mA output capability - designed for battery-powered instrumentation requiring ultra-low standby power.
For engineers reviewing the NCV551SN31T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC-Q100 qualification, TSOP-5 package thermal performance (RJA = 250 °C/W), enable-controlled shutdown, and dropout voltage of 150 mV at 10 mA load - critical for maintaining regulation in low-voltage automotive subsystems.
Technical Context
The NCV551SN31T1G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, current limit, and thermal shutdown. It operates across 1.8 V to 12 V input range and delivers stable 3.1 V output with no minimum load requirement.
Its enable input supports logic-level control (VTH(EN) = 1.3 V typ. for turn-on), and it achieves stable operation with ≥0.1 µF ceramic output capacitance - eliminating need for ESR-tuned tantalum capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1 V ±2.0% (ensures stable MCU core supply under automotive temperature extremes) |
| Quiescent Current | 4.0 µA typical (enables >10-year battery life in always-on vehicle sensors) |
| Dropout Voltage | 150 mV at 10 mA (maintains regulation down to 3.25 V input in 3.3 V systems) |
| Max Input Voltage | 12 V (supports direct connection to automotive 12 V rail with transient margin) |
| Operating Temp | −40 °C to +125 °C (qualified for engine bay and ADAS module placement) |
| Output Current | 150 mA continuous (powers microcontrollers, CAN transceivers, and analog front-ends) |
| Enable Threshold | 1.3 V (logic-high turn-on compatible with 1.8 V/3.3 V GPIO without level-shifting) |
Pinout & Package
NCV551SN31T1G is housed in a TSOP-5 (SOT-23-5, Case 483) surface-mount package measuring 3.00 × 1.50 × 0.95 mm with 0.95 mm pitch. The package features exposed pad for thermal enhancement and Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply (accepts 1.8–12 V; requires local 0.1 µF decoupling) |
| 2 | GND | Power ground reference (must be low-impedance path to minimize noise coupling) |
| 3 | Enable | Active-high enable (pull to Vin for always-on; pull ≤0.3 V to disable output) |
| 4 | N/C | No internal connection (left floating or grounded per layout best practice) |
| 5 | Vout | Regulated 3.1 V output (requires ≥0.1 µF ceramic capacitor; ESR-insensitive) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125 °C ambient, supporting PPAP documentation |
| Ultra-low quiescent current | 4.0 µA enables <1 µA system sleep current when paired with enable-controlled peripherals |
| PMOS pass transistor | Eliminates reverse-current flow and enables true zero-load ground current |
| Thermal shutdown protection | Activates at ~160 °C junction temperature to prevent permanent damage during overload |
| Stable with ceramic capacitors | Supports 0.1 µF–10 µF X7R/X5R ceramics - reduces BOM cost and board space vs. tantalum |
Applications
| Automotive Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powering microcontroller, LIN transceiver, and sensor interface in door module with 12 V battery input subject to cold cranking. IC Role / Device Role / Timing Role: Primary 3.1 V LDO supplying MCU core and I/O rails with enable-synchronized wake-up. Use Value: 4.0 µA quiescent current ensures BCM meets ISO 16750-2 parasitic drain limits (<50 µA total); 125 °C rating avoids derating in enclosed pillar locations. | Use Scenario: Providing clean, low-noise 3.1 V bias to image sensor and ISP in rear-view camera exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Post-regulator after buck converter, delivering ripple-free power with fast line transient response. Use Value: 150 mV dropout preserves regulation during 12 V rail sag to 8.5 V; ±2.0% accuracy maintains sensor ADC reference stability. |
| Telematics Control Unit (TCU) Real-Time Clock | Electric Power Steering (EPS) Position Sensor Interface |
Use Scenario: Backup power supply for RTC and SRAM in TCU during ignition-off, powered by supercapacitor charged from main 3.3 V rail. IC Role / Device Role / Timing Role: Always-on LDO with enable disabled, sustaining 3.1 V from decaying capacitor voltage down to 3.25 V input. Use Value: Ultra-low IQ extends supercap hold-up time beyond 72 hours; N/C pin simplifies layout in space-constrained modules. | Use Scenario: Powering Hall-effect position sensor and signal conditioner in EPS motor assembly operating near gearbox heat sources. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5 V domain to precise 3.1 V for analog signal chain. Use Value: −40 °C to +125 °C operation matches EPS thermal profile; thermal shutdown prevents latch-up during oil-cooler failure events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV8170ASN310T1G | Higher IQ (1.2 µA), lower dropout (90 mV @ 150 mA), same TSOP-5 package | Better suited for high-current, low-input-voltage scenarios where thermal headroom is limited | Select when >100 mA load and input <3.5 V require tighter dropout; verify enable compatibility (active-low vs. active-high) |
| TLV73331PDBVR | Lower IQ (350 nA), smaller SOT-23-5 package, but only rated to +105 °C | Not AEC-Q100 qualified; unsuitable for under-hood or safety-critical zones | Consider only for non-automotive portable electronics where footprint and IQ are primary drivers |
Compared with NCV551SN31T1G, NCV8170ASN310T1G offers superior thermal performance at high load but lacks identical enable polarity; TLV73331PDBVR provides nanoamp IQ but fails automotive temperature and qualification requirements - making NCV551SN31T1G the sole AEC-Q100-compliant 3.1 V TSOP-5 LDO with sub-5 µA IQ in this form factor.
Availability
NCV551SN31T1G is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, telematics control units, and electric power steering systems requiring stable component supply amid industry-wide discontinuations.
Supply support for NCV551SN31T1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - with leadership in power management, imaging, and intelligent sensing.
The NCV551 series belongs to onsemi's automotive-qualified LDO portfolio, engineered specifically for low-power, high-reliability subsystems in vehicles - emphasizing ultra-low IQ, wide temperature operation, and robust transient immunity.
FAQ
Is NCV551SN31T1G still in production?
No - according to onsemi's official datasheet revision 20 (January 2026), NCV551SN31T1G is marked as discontinued. However, Aetrix Electronics maintains legacy inventory and supports design-in continuity through controlled allocation, cross-reference assistance, and last-time-buy planning for active production programs.
What is the maximum allowable input voltage for NCV551SN31T1G?
The absolute maximum input voltage for NCV551SN31T1G is 12 V, as specified in the Maximum Ratings table. Exceeding this value risks permanent device damage. For inputs above 12 V, onsemi recommends using a pre-regulator circuit (e.g., Figure 24 in the datasheet) to step down voltage before feeding NCV551SN31T1G.
Does NCV551SN31T1G require an external resistor on the Enable pin?
No - NCV551SN31T1G does not require an external pull-up resistor on the Enable pin. If always-on operation is desired, connect Enable directly to Vin. If enable control is needed, drive the pin with a logic signal referenced to GND; the threshold is 1.3 V (typ.) for turn-on and ≤0.3 V for turn-off.
Can NCV551SN31T1G be used with a 0.01 µF output capacitor?
No - NCV551SN31T1G requires a minimum output capacitance of 0.1 µF (ceramic or tantalum) for stability, as explicitly stated in the datasheet. Using 0.01 µF violates the stability condition and may cause oscillation or poor transient response, especially under load steps.
What is the thermal resistance (RJA) of NCV551SN31T1G in standard layout?
The junction-to-ambient thermal resistance (RJA) of NCV551SN31T1G is 250 °C/W when mounted on an 80 × 80 × 1.5 mm FR4 PCB with 1 oz copper and 100 mm² copper spreading area - per JEDEC JESD51-2 test conditions. This value assumes no additional thermal vias or heatsinking; adding thermal vias can reduce RJA by up to 30%.
NCV551SN31T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 10mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 8 µA
- Current - Supply (Max):
- 8 µA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCV551SN31T1G FAQ
1.How can I place an order for NCV551SN31T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV551SN31T1G 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 NCV551SN31T1G reliable?
The price and inventory of NCV551SN31T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV551SN31T1G is usually 5 days.
3.What payment methods are accepted for NCV551SN31T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV551SN31T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV551SN31T1G?
NCV551SN31T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV551SN31T1G 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 NCV551SN31T1G?
For technical support, including NCV551SN31T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV551SN31T1G requirements.
6.How does Aetrix verify that NCV551SN31T1G is sourced from the original manufacturer or authorized distributors?
All NCV551SN31T1G 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 NCV551SN31T1G meets industry standards.
7.What is the process for return or replacement of NCV551SN31T1G?
All NCV551SN31T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCV551SN31T1G, 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 NCV551SN31T1G part is unused and in its original packaging.
Return procedure for NCV551SN31T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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