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onsemi NCP553SQ18T1
- Part No.:
- NCP553SQ18T1
- Manufacturer:
- onsemi
- Package:
- SC-82A, SOT-343
- Datasheet:
-
NCP553SQ18T1.pdf
- Description:
- IC REG LINEAR 1.8V 80MA SC82AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,772
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Product details
Overview
NCP553SQ18T1 from onsemi is a fixed-output 1.8 V, 80 mA CMOS low-IQ NOCAP linear regulator in SC82-AB (SC70-4) package, featuring 2.8 µA typical quiescent current, ±2.0% output voltage accuracy, and operation without output capacitor - designed for battery-powered portable electronics requiring ultra-low standby power.
For engineers reviewing the NCP553SQ18T1 datasheet, pinout, applications, or equivalent options, this device serves as a capacitor-free LDO for space-constrained, low-power systems where ground current minimization and thermal stability across −40°C to +85°C are critical selection criteria.
Technical Context
The NCP553SQ18T1 implements a PMOS pass transistor architecture with internal voltage reference, error amplifier, and protection circuits including thermal shutdown and current limiting. It operates without an output capacitor due to inherent stability with ceramic decoupling only at input.
No enable functionality is integrated - Pin 4 is N/C - distinguishing it from the NCP552 variant. Its dropout voltage is 730 mV (typ) at 80 mA and +25°C, and line regulation is 2.0 mV/V max over 1.0 V to 12 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% - ensures stable core/sensor rail within tight tolerance across temperature and load. |
| Quiescent Current | 2.8 µA typ - enables multi-year battery life in always-on IoT sensors and wearables. |
| Max Output Current | 80 mA - supports low-power microcontrollers, RF transceivers, and analog front-ends. |
| Dropout Voltage | 730 mV @ 80 mA - allows operation from single-cell Li-ion (3.0 V min) down to ~2.53 V input. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Input Voltage Range | Up to 12 V - accommodates wide-input battery or adapter-fed systems with margin. |
| Output Noise | 90 µVRMS (20 Hz–100 kHz) - suitable for noise-sensitive analog circuitry without added filtering. |
Pinout & Package
Package: SC82-AB (SC70-4), 1.8 mm × 1.35 mm × 0.95 mm body, 4-pin surface-mount, Pb-free (RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power supply ground reference - must be low-impedance connection to minimize noise coupling. |
| 2 | Vin | Positive input supply - accepts 1.0 V to 12 V; requires 1 µF ceramic decoupling close to pin. |
| 3 | Vout | Regulated 1.8 V output - stable without output capacitor; optional 0.1 µF+ improves transient response. |
| 4 | N/C | No internal connection - left floating or grounded; not usable for control or feedback. |
Key Features
| Feature | Design Value |
|---|---|
| NOCAP operation | Stable with no output capacitor - eliminates BOM cost, board area, and ESR dependency. |
| Ultra-low IQ | 2.8 µA typical - reduces standby power loss by >95% vs. standard LDOs, extending shelf life. |
| ±2.0% output accuracy | Tight initial tolerance - avoids system-level calibration for 1.8 V logic/sensor rails. |
| Thermal shutdown | Activates at ~160°C junction - protects against sustained overload or poor PCB thermal design. |
| Ceramic capacitor compatible | Works with low-ESR ceramics (X5R/X7R) - enables miniaturized, high-reliability filtering. |
Applications
| Wearable Health Sensors | Bluetooth LE Modules |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring in wrist-worn devices powered by coin-cell or thin-film batteries. IC Role / Device Role / Timing Role: Primary 1.8 V supply for ultra-low-power MCU and analog signal chain. Use Value: 2.8 µA quiescent current enables >3-year battery life; NOCAP operation saves PCB area in 5 mm × 5 mm form factor. |
Use Scenario: Powering Nordic nRF52/nRF53 SoCs and matching network in compact BLE beacons. IC Role / Device Role / Timing Role: Clean, regulated 1.8 V rail for radio and digital core domains. Use Value: 90 µVRMS noise prevents RX sensitivity degradation; 730 mV dropout sustains operation down to 2.53 V input. |
| Industrial Wireless Transmitters | Portable Test Equipment |
Use Scenario: Battery-operated LoRaWAN sensor nodes deployed in remote field locations. IC Role / Device Role / Timing Role: Main LDO for sub-GHz transceiver and microcontroller during periodic wake-up bursts. Use Value: −40°C to +85°C rating ensures reliability in uncontrolled outdoor enclosures; no output cap simplifies conformal coating. |
Use Scenario: Handheld multimeters and oscilloscope probes requiring precision analog rails. IC Role / Device Role / Timing Role: Low-noise 1.8 V source for ADC reference buffers and op-amp biasing. Use Value: 2.0% output accuracy maintains measurement linearity; ceramic compatibility avoids tantalum aging effects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-IQ LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 2.3 µA IQ, 250 mA output, SOT-23-3 package, requires 1 µF output cap. | Higher current capability but larger footprint and mandatory output capacitance. | Select when >80 mA load or tighter thermal margin is needed; avoid if NOCAP is mandatory. |
| Torex XC6206P182MR-G | 1.0 µA IQ, 250 mA, SOT-23-3, 1 µF output cap required, ±2% accuracy. | Lower IQ but incompatible with capacitor-free operation and uses different pinout (Vin-Vout-GND). | Prefer for extreme battery life in non-NOCAP designs; not drop-in due to pinout and cap requirement. |
Compared with NCP553SQ18T1, MCP1700T-1802E/TT offers higher output current but forfeits NOCAP operation and increases board area, while XC6206P182MR-G achieves lower quiescent current yet mandates external capacitance and rework of layout - making NCP553SQ18T1 optimal for space- and capacitor-constrained 80 mA applications.
Availability
NCP553SQ18T1 is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth LE modules, and industrial wireless transmitters requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.
Supply support for NCP553SQ18T1 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and edge applications.
The NCP553 series belongs to onsemi's ultra-low-quiescent-current LDO portfolio, engineered specifically for battery-powered portable electronics where minimizing standby power and eliminating output capacitors are primary system-level requirements.
FAQ
What is the maximum input voltage rating for the NCP553SQ18T1?
The NCP553SQ18T1 has a maximum input voltage rating of 12 V, as specified in its Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, design margins should keep Vin ≤11.5 V under worst-case conditions including ripple and transients.
Does the NCP553SQ18T1 require an output capacitor to operate stably?
No, the NCP553SQ18T1 is explicitly designed as a NOCAP regulator and operates stably without any output capacitor. This is confirmed in both the device description and Applications Information section of the datasheet. An optional 0.1 µF ceramic capacitor may be added to improve load transient response.
What is the function of Pin 4 on the NCP553SQ18T1?
Pin 4 on the NCP553SQ18T1 is marked N/C (No Connection) and has no internal connection. It must be left floating or tied to GND - it cannot be used for enable, feedback, or any control function. This distinguishes NCP553SQ18T1 from the NCP552 variant, which uses Pin 4 as an Enable input.
What is the dropout voltage of the NCP553SQ18T1 at 80 mA load and room temperature?
The dropout voltage of the NCP553SQ18T1 is 730 mV (typical) at 80 mA output current and +25°C ambient temperature, measured when Vout drops 3.0% below nominal (i.e., to 1.746 V). The maximum dropout is 1200 mV across −40°C to +125°C per the datasheet's electrical characteristics table.
Is the NCP553SQ18T1 suitable for automotive applications?
The NCP553SQ18T1 is rated for −40°C to +85°C operation and is intended for industrial and consumer portable equipment. For automotive applications, the NCV553SQ18T1 variant - qualified to AEC-Q100 and rated for −40°C to +125°C - is the appropriate choice. The NCP553SQ18T1 lacks automotive qualification and thermal margin.
NCP553SQ18T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- NOCAP™
- Package/Case:
- SC-82A, SOT-343
- 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):
- 1.6V @ 80mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- 6 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-82AB
NCP553SQ18T1 FAQ
1.How can I place an order for NCP553SQ18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP553SQ18T1 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 NCP553SQ18T1 reliable?
The price and inventory of NCP553SQ18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP553SQ18T1 is usually 5 days.
3.What payment methods are accepted for NCP553SQ18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP553SQ18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP553SQ18T1?
NCP553SQ18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP553SQ18T1 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 NCP553SQ18T1?
For technical support, including NCP553SQ18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP553SQ18T1 requirements.
6.How does Aetrix verify that NCP553SQ18T1 is sourced from the original manufacturer or authorized distributors?
All NCP553SQ18T1 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 NCP553SQ18T1 meets industry standards.
7.What is the process for return or replacement of NCP553SQ18T1?
All NCP553SQ18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP553SQ18T1, 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 NCP553SQ18T1 part is unused and in its original packaging.
Return procedure for NCP553SQ18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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