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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP553SQ28T1

Name: NCP553SQ28T1
Brand: onsemi
SKU: NCP553SQ28T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP553SQ28T1

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-82A, SOT-343

Datasheet:: NCP553SQ28T1.pdf

Description:: IC REG LINEAR 2.8V 80MA SC82AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP553SQ28T1 from onsemi is a fixed-output 2.8 V, 80 mA CMOS low-I_Q 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 capacitance - designed for battery-powered portable electronics requiring ultra-low standby power.

For engineers reviewing the NCP553SQ28T1 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, pin-level circuit roles, real-world use scenarios, and validated alternative options for low-power LDO selection in space-constrained, long-battery-life designs.

Technical Context

The NCP553SQ28T1 implements a PMOS pass transistor architecture with internal voltage reference, error amplifier, and thermal/overcurrent protection - enabling stable regulation without external output capacitors. Its NOCAP design eliminates ESR dependency and supports ceramic or tantalum input decoupling only.

Unlike the NCP552 variant, the NCP553SQ28T1 omits the enable function and replaces Pin 4 with a no-connect (N/C), simplifying control logic but removing ON/OFF sequencing capability. It operates across −40°C to +85°C ambient temperature with 730 mV typical dropout at 80 mA load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2.0% - ensures precise rail generation for 2.8 V logic or analog subsystems without trimming.
Quiescent Current	2.8 µA typical - enables multi-year battery life in always-on sensor nodes or standby circuits.
Max Output Current	80 mA - sufficient for microcontrollers, RF transceivers, or display drivers in compact portable devices.
Dropout Voltage	730 mV typical at 80 mA - allows operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min) sources.
Input Voltage Range	Up to 12 V - accommodates wide-input industrial or automotive-supply environments with margin.
Thermal Shutdown	Activates at ~160°C - protects against sustained overload or poor PCB thermal design without external circuitry.
Operating Temp	−40°C to +85°C - qualified for consumer, industrial, and extended-temperature embedded applications.

Pinout & Package

Package: SC82-AB (SC70-4), 1.8 mm × 1.15 mm × 0.8 mm surface-mount package with 0.65 mm pitch - optimized for high-density portable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Power supply ground reference - must be low-impedance connection to minimize noise coupling and ensure regulation stability.
2	Vin	Positive input supply - accepts up to 12 V; requires local 1.0 µF ceramic decoupling capacitor per layout guidelines.
3	Vout	Regulated 2.8 V output - capable of driving loads up to 80 mA without external output capacitor (NOCAP architecture).
4	N/C	No internal connection - left unconnected; not usable for enable, feedback, or bias functions.

Key Features

Feature	Design Value
NOCAP Operation	Stable regulation with zero output capacitance - eliminates BOM cost, board area, and reliability risk from output caps.
Ultra-Low I_Q	2.8 µA typical - reduces standby power loss by >95% vs. standard LDOs, critical for coin-cell or energy-harvesting systems.
PMOS Pass Element	Enables low dropout and no reverse-current flow - prevents backfeed from Vout to Vin during shutdown or input brownout.
±2.0% Output Accuracy	Tight initial tolerance over temperature - avoids need for post-production calibration in precision analog or ADC reference rails.
Thermal & Current Protection	Integrated shutdown at ~160°C and current limit - ensures robustness under fault conditions without external protection components.

Applications

Wearable Health Monitor	Bluetooth LE Sensor Node
Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell with 10-year target battery life. IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator for ultra-low-power MCU and analog front-end. Use Value: 2.8 µA quiescent current extends battery life beyond 12 years; NOCAP operation removes output cap aging failure mode.	Use Scenario: Compact environmental sensor tag transmitting temperature/humidity every 5 minutes via BLE. IC Role / Device Role / Timing Role: Fixed 2.8 V supply for nRF52832 SoC and digital sensors during active and sleep cycles. Use Value: 730 mV dropout enables full utilization of declining coin-cell voltage down to 2.8 V + 0.73 V = 3.53 V.
Industrial Handheld Scanner	Smart Home Motion Detector
Use Scenario: Rugged barcode scanner using two AA alkaline cells, operating across −20°C to +60°C ambient. IC Role / Device Role / Timing Role: Main 2.8 V rail for laser driver, image sensor, and ARM Cortex-M0+ processor. Use Value: −40°C to +85°C rating ensures reliable startup and regulation at cold storage temperatures; SC70-4 footprint saves PCB area.	Use Scenario: PIR-based occupancy detector powered by three AAA batteries, sleeping >99.9% of time. IC Role / Device Role / Timing Role: Always-on 2.8 V supply for PIR signal conditioning and wake-up logic. Use Value: No-enable architecture simplifies design; 2.8 µA I_Q keeps average current below 1 µA, enabling >5-year battery life.

Wearable Health Monitor

Bluetooth LE Sensor Node

Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell with 10-year target battery life.

IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator for ultra-low-power MCU and analog front-end.

Use Value: 2.8 µA quiescent current extends battery life beyond 12 years; NOCAP operation removes output cap aging failure mode.

Use Scenario: Compact environmental sensor tag transmitting temperature/humidity every 5 minutes via BLE.

IC Role / Device Role / Timing Role: Fixed 2.8 V supply for nRF52832 SoC and digital sensors during active and sleep cycles.

Use Value: 730 mV dropout enables full utilization of declining coin-cell voltage down to 2.8 V + 0.73 V = 3.53 V.

Industrial Handheld Scanner

Smart Home Motion Detector

Use Scenario: Rugged barcode scanner using two AA alkaline cells, operating across −20°C to +60°C ambient.

IC Role / Device Role / Timing Role: Main 2.8 V rail for laser driver, image sensor, and ARM Cortex-M0+ processor.

Use Value: −40°C to +85°C rating ensures reliable startup and regulation at cold storage temperatures; SC70-4 footprint saves PCB area.

Use Scenario: PIR-based occupancy detector powered by three AAA batteries, sleeping >99.9% of time.

IC Role / Device Role / Timing Role: Always-on 2.8 V supply for PIR signal conditioning and wake-up logic.

Use Value: No-enable architecture simplifies design; 2.8 µA I_Q keeps average current below 1 µA, enabling >5-year battery life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-2802E/TT	2.8 V, 250 mA, 1.6 µA I_Q, SOT-23-3 package - higher current, lower I_Q, but requires minimum 1 µF output capacitor.	Supports higher peak loads (e.g., Wi-Fi burst transmission) but adds capacitor BOM and layout complexity.	Select when >80 mA output or tighter I_Q is required, and output capacitance is acceptable.
TPS7A0230PDBVR	2.8 V, 300 mA, 25 nA I_Q, X2SON-4 - nanoscale I_Q, higher current, same 4-pin footprint but different pinout (EN on Pin 4).	Enables deep-sleep modes with enable control; incompatible pinout prevents drop-in replacement.	Select when enable functionality and sub-µA I_Q are mandatory, and board redesign is feasible.

Compared with NCP553SQ28T1, MCP1700T-2802E/TT offers higher drive capability at lower quiescent current but forfeits NOCAP operation, while TPS7A0230PDBVR delivers extreme ultra-low I_Q with enable control but requires PCB layout revision due to non-compatible pin mapping.

Availability

NCP553SQ28T1 is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, industrial handheld scanners, smart home motion detectors, and other battery-powered portable electronics requiring stable component supply with long-term lifecycle support.

Supply support for NCP553SQ28T1 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP553SQ28T1 belongs to onsemi's NOCAP LDO family - engineered specifically for ultra-low-power, capacitor-free voltage regulation in size- and battery-life-constrained portable electronics.

FAQ

What is the maximum input voltage rating for the NCP553SQ28T1?

The NCP553SQ28T1 has an absolute maximum input voltage rating of 12 V. Exceeding this value risks permanent device damage. For reliable operation, maintain Vin ≤ 12 V and observe derating curves in the datasheet for thermal limits at elevated ambient temperatures or high load currents. The NCP553SQ28T1 is rated for continuous operation up to 12 V input under specified thermal conditions.

Does the NCP553SQ28T1 require an output capacitor to function?

No, the NCP553SQ28T1 does not require an output capacitor due to its NOCAP architecture. It remains stable with zero output capacitance, though adding a 0.1 µF–10 µF ceramic capacitor improves load transient response. This feature eliminates capacitor aging, leakage, and board space concerns - a key advantage confirmed in Figure 2 and Applications Information section of the official datasheet for NCP553SQ28T1.

What is the dropout voltage of the NCP553SQ28T1 at 80 mA load?

The NCP553SQ28T1 has a typical dropout voltage of 730 mV at 80 mA load and −40°C to +125°C junction temperature, measured when Vout drops 3.0% below nominal (i.e., to 2.716 V). Maximum dropout is 1200 mV under worst-case conditions. This enables operation from input voltages as low as 3.53 V while maintaining regulated 2.8 V output - a verified specification in the Electrical Characteristics table for NCP553SQ28T1.

Is the NCP553SQ28T1 pin-compatible with the NCP552SQ28T1?

No, the NCP553SQ28T1 is not pin-compatible with the NCP552SQ28T1. While both share the SC82-AB (SC70-4) package and identical Pin 1 (GND), Pin 4 differs: NCP552SQ28T1 uses Pin 4 as Enable, whereas NCP553SQ28T1 designates Pin 4 as N/C. Swapping them without circuit modification will disable enable functionality or cause undefined behavior. This distinction is explicitly documented in the PIN FUNCTION DESCRIPTION table for NCP553SQ28T1.

What is the operating temperature range of the NCP553SQ28T1?

The NCP553SQ28T1 is specified for an operating ambient temperature range of −40°C to +85°C. This industrial-grade rating is confirmed in the Maximum Ratings table and Electrical Characteristics section of the datasheet. It does not include the extended −40°C to +125°C range of the automotive-grade NCV553 variant - a distinction clearly stated for NCP553SQ28T1 in the official documentation.

NCP553SQ28T1 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):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.2V @ 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

NCP553SQ28T1 FAQ

1.How can I place an order for NCP553SQ28T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP553SQ28T1 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 NCP553SQ28T1 reliable?

The price and inventory of NCP553SQ28T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP553SQ28T1 is usually 5 days.

3.What payment methods are accepted for NCP553SQ28T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP553SQ28T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP553SQ28T1?

NCP553SQ28T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP553SQ28T1 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 NCP553SQ28T1?

For technical support, including NCP553SQ28T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP553SQ28T1 requirements.

6.How does Aetrix verify that NCP553SQ28T1 is sourced from the original manufacturer or authorized distributors?

All NCP553SQ28T1 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 NCP553SQ28T1 meets industry standards.

7.What is the process for return or replacement of NCP553SQ28T1?

All NCP553SQ28T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP553SQ28T1, 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 NCP553SQ28T1 part is unused and in its original packaging.

Return procedure for NCP553SQ28T1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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