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onsemi NCP551SN18T1
- Part No.:
- NCP551SN18T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP551SN18T1.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
NCP551SN18T1 from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 1.8 V at up to 150 mA with ultra-low quiescent current (4.0 µA typical), designed for battery-powered portable electronics requiring stable low-voltage supply under light-load conditions. It integrates PMOS pass transistor, thermal shutdown, and current limit protection in a TSOP-5 package.
For engineers reviewing the NCP551SN18T1 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage (130 mV at 10 mA), ±2.0% output accuracy over temperature, enable functionality, ceramic capacitor compatibility (≥0.1 µF), and industrial operating range (−40 °C to +85 °C).
Technical Context
The NCP551SN18T1 employs a PMOS pass transistor architecture enabling low dropout and near-zero ground current variation across load. Its internal error amplifier compares feedback against a precision voltage reference, while dedicated enable logic controls output state independently of input voltage.
Thermal shutdown activates at ~160 °C junction temperature, and current limiting protects against short-circuit faults. The device operates stably with ceramic output capacitors as low as 0.1 µF-no ESR requirement-making it suitable for space-constrained, low-noise applications where minimal external components are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% (ensures stable core/logic rail for 1.8 V microcontrollers and sensors) |
| Max Output Current | 150 mA (supports moderate-power peripherals without external boost) |
| Quiescent Current | 4.0 µA typical (enables multi-year battery life in always-on IoT nodes) |
| Dropout Voltage | 130 mV at 10 mA (allows operation down to Vin = 1.93 V for 1.8 V output) |
| Input Voltage Range | 0 V to 12 V (compatible with single-cell Li-ion, 2-cell alkaline, or regulated intermediate rails) |
| Accuracy vs Temp | ±2.0% over −40 °C to +85 °C (meets industrial-grade voltage tolerance requirements) |
| Enable Threshold | VTH(HI) = 1.3 V, VTH(LO) = 0.3 V (supports direct GPIO control from 1.8 V/3.3 V MCUs) |
Pinout & Package
Package: TSOP-5 (Case 483), surface-mount, 3.00 × 1.50 × 0.95 mm, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive power supply input; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 2 | GND | Power ground reference; requires low-impedance PCB plane connection |
| 3 | Enable | Active-high digital control; pull to Vin to enable, to GND to disable (standby IQ < 1 µA) |
| 4 | N/C | No internal connection; leave unconnected or float (not tied to any net) |
| 5 | Vout | Regulated 1.8 V output; requires ≥0.1 µF ceramic capacitor directly at pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 4.0 µA typical enables >10-year battery life in 10 µA average-load applications |
| Ceramic capacitor stability | Stable with 0.1 µF–10 µF ceramic output caps-no ESR requirement simplifies BOM and layout |
| Integrated protection | Thermal shutdown (~160 °C) and current limit prevent damage during fault conditions |
| Enable-controlled standby | Reduces ground current to <1 µA when disabled-ideal for duty-cycled sensor nodes |
| Precision output accuracy | ±2.0% over full temperature range ensures reliable operation of 1.8 V logic and analog interfaces |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
Use Scenario: Compact wearable patch measuring ECG/PPG with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary 1.8 V supply for ultra-low-power MCU, analog front-end, and BLE radio. Use Value: 4.0 µA quiescent current extends coin-cell lifetime beyond 2 years; 130 mV dropout allows operation until battery drops to 1.93 V. | Use Scenario: Battery-powered wireless temperature/humidity node deployed in factory environments. IC Role / Device Role / Timing Role: Regulated 1.8 V rail for microcontroller, ADC, and RF transceiver in harsh industrial ambient (−40 °C to +85 °C). Use Value: ±2.0% output accuracy ensures consistent ADC reference and sensor biasing across temperature; TSOP-5 footprint saves board area. |
| Portable Barcode Scanner | Smart Home Motion Detector |
Use Scenario: Handheld scanner using laser diode and CMOS imager powered by two AA cells. IC Role / Device Role / Timing Role: Low-noise 1.8 V supply for image sensor and processing ASIC during brief active bursts. Use Value: Stable regulation with 0.1 µF ceramic cap minimizes voltage droop during 150 mA imaging pulses; enable pin synchronizes power with scan trigger. | Use Scenario: PIR-based occupancy detector with wake-on-motion and periodic BLE beaconing. IC Role / Device Role / Timing Role: Always-on 1.8 V regulator powering PIR signal chain and ultra-low-power MCU in deep-sleep mode. Use Value: Sub-µA shutdown current (<1 µA) eliminates battery drain during 99.9% idle time; industrial temp rating ensures reliability in attic/crawlspace installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-IQ LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 4.0 µA IQ, 1.8 V, SOT-23-3; no enable pin; 600 mV dropout at 250 mA | Lacks enable control; higher dropout limits usable input range | Select when enable function is unnecessary and board space favors 3-pin SOT-23 |
| Torex XC6206P182MR-G | 1.0 µA IQ, 1.8 V, SOT-23-3; no enable; ±2% accuracy; 350 mV dropout at 100 mA | Lower IQ but higher dropout and no enable; smaller package | Prefer for extreme battery life where enable control and low dropout are secondary |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP551SN18T1 uniquely combines ultra-low IQ, enable functionality, low dropout (130 mV), and industrial temperature range in a 5-pin TSOP package-making it optimal for space-constrained, feature-rich portable designs requiring precise power sequencing.
Availability
NCP551SN18T1 is available at Aetrix Electronics and suitable for wearable electronics, industrial sensor nodes, and portable barcode scanners requiring stable component supply with long-term lifecycle support.
Supply support for NCP551SN18T1 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics for automotive, industrial, cloud, medical, and IoT applications.
The NCP551 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for battery-powered portable equipment demanding ultra-low quiescent current, small footprint, and robust protection features.
FAQ
What is the maximum input voltage rating for the NCP551SN18T1?
The NCP551SN18T1 supports an absolute maximum input voltage of 12 V. Operation above this level risks permanent damage. For inputs exceeding 12 V, a pre-regulator stage (e.g., resistive divider + Zener or upstream buck converter) must be used before the NCP551SN18T1 input pin to ensure safe operation within its rated range.
Does the NCP551SN18T1 require an external resistor network to set output voltage?
No, the NCP551SN18T1 is a fixed-output regulator with internally trimmed 1.8 V reference and feedback network. No external resistors are needed-only input and output decoupling capacitors (≥0.1 µF ceramic each) are required for stable operation.
Can the NCP551SN18T1 be used with tantalum capacitors instead of ceramic?
Yes, the NCP551SN18T1 is stable with both ceramic and tantalum output capacitors. The datasheet explicitly states compatibility with capacitors having ESR from a few mΩ up to 3.0 Ω, and minimum value of 0.1 µF. Tantalum types may be preferred where lower leakage is critical, though ceramic remains optimal for size and cost.
What happens to the output when the Enable pin is left floating on the NCP551SN18T1?
The Enable pin must not be left floating. Per the datasheet, if unused, it must be connected directly to Vin to guarantee proper turn-on. A floating Enable pin may result in unpredictable output behavior-including oscillation, partial turn-on, or failure to regulate-due to noise coupling or undefined logic threshold crossing.
Is the NCP551SN18T1 pin-compatible with other variants in the NCP551 family?
Yes, all NCP551 variants-including NCP551SN15T1, NCP551SN25T1, and NCP551SN33T1-share identical TSOP-5 (Case 483) pinout and footprint. Only the output voltage differs; no PCB redesign is needed when substituting between standard voltage options in the same package.
NCP551SN18T1 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.22V @ 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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP551SN18T1 FAQ
1.How can I place an order for NCP551SN18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP551SN18T1 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 NCP551SN18T1 reliable?
The price and inventory of NCP551SN18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP551SN18T1 is usually 5 days.
3.What payment methods are accepted for NCP551SN18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP551SN18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP551SN18T1?
NCP551SN18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP551SN18T1 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 NCP551SN18T1?
For technical support, including NCP551SN18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP551SN18T1 requirements.
6.How does Aetrix verify that NCP551SN18T1 is sourced from the original manufacturer or authorized distributors?
All NCP551SN18T1 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 NCP551SN18T1 meets industry standards.
7.What is the process for return or replacement of NCP551SN18T1?
All NCP551SN18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP551SN18T1, 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 NCP551SN18T1 part is unused and in its original packaging.
Return procedure for NCP551SN18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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