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onsemi NCP561SN18T1
- Part No.:
- NCP561SN18T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP561SN18T1.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,091
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Product details
Overview
NCP561SN18T1 from onsemi is a fixed-output 1.8 V, 150 mA CMOS low-dropout linear regulator with 3.0 µA typical quiescent current, 170 mV dropout at full load, and ±2.0% output voltage accuracy-designed for battery-powered handheld instruments requiring ultra-low standby power.
For engineers reviewing the NCP561SN18T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 150 mA, thermal shutdown behavior, enable threshold compatibility with 1.8 V logic, TSOP-5 footprint constraints, and ceramic capacitor stability with ≥1.0 µF output capacitance.
Technical Context
The NCP561SN18T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit and thermal shutdown) in a single monolithic IC. It operates without external compensation and maintains regulation down to 170 mV input–output differential at 150 mA load across –40°C to +85°C.
Enable functionality is implemented via a dedicated logic-level input (VTH(HI) = 1.3 V, VTH(LO) = 0.2 V), allowing direct interface with microcontroller GPIOs. The device draws only 3.0 µA quiescent current when enabled and <0.1 µA in shutdown-critical for long-life portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% - stable supply for 1.8 V core logic, memory I/O, or RF bias rails |
| Max Output Current | 150 mA - sufficient for microcontrollers, sensors, and low-power peripherals |
| Dropout Voltage | 170 mV at 150 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) |
| Quiescent Current | 3.0 µA typical - extends battery life in always-on monitoring modes |
| Operating Temp | –40°C to +85°C - qualified for industrial and consumer portable environments |
| Input Voltage Range | Up to 6.0 V - supports common battery chemistries and unregulated DC inputs |
| Output Noise | 60 µVRMS (20 Hz–100 kHz) - low enough for analog sensor front-ends and ADC references |
Pinout & Package
Package: TSOP-5 (3.0 mm × 1.5 mm × 0.95 mm, 0.95 mm pitch), surface-mount, Pb-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts up to 6.0 V; requires local 1.0 µF decoupling capacitor |
| 2 - GND | Power ground reference | Low-impedance return path; must be routed with wide copper for noise immunity |
| 3 - Enable | Logic-controlled ON/OFF input | Pulled high to VIN for operation; pulled low (<0.2 V) disables output and reduces IQ to <0.1 µA |
| 4 - N/C | No internal connection | Not bonded; must remain unconnected or floating-no PCB trace or pull-up/down |
| 5 - VOUT | Regulated 1.8 V output | Stable 1.8 V source; requires ≥1.0 µF ceramic or tantalum output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.0 µA typical - enables multi-year battery life in wake-on-event sensor nodes |
| Low dropout with PMOS pass element | 170 mV @ 150 mA - eliminates need for higher-voltage batteries or boost stages |
| Stable with ceramic capacitors | Supports 1.0 µF minimum COUT - reduces BOM cost and board space vs. electrolytic/tantalum-only LDOs |
| Integrated protection | Current limit and thermal shutdown - prevents damage during short-circuit or overload events |
| Enable control with logic-compatible thresholds | VEN(HI) = 1.3 V, VEN(LO) = 0.2 V - interoperable with 1.8 V and 3.3 V microcontrollers without level shifters |
Applications
| Battery-Powered Instruments | Hand-Held Test Equipment |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Primary 1.8 V supply for MCU, display driver, and analog front-end. Use Value: 170 mV dropout allows full 150 mA operation down to 1.97 V input-extending usable battery range by >15% versus higher-dropout regulators. | Use Scenario: Handheld oscilloscope probe interface module with sleep mode. IC Role / Device Role / Timing Role: Always-on 1.8 V rail for wake-up controller and low-power RAM retention. Use Value: 3.0 µA quiescent current enables >5-year shelf life on coin cell backup without compromising fast wake-up latency. |
| Camcorder Image Sensor Bias | Wearable Health Monitor |
Use Scenario: Low-noise bias supply for CMOS image sensor analog chain in compact camcorder. IC Role / Device Role / Timing Role: Clean 1.8 V analog supply decoupled from noisy digital domains. Use Value: 60 µVRMS output noise ensures <1 LSB error in 12-bit sensor ADC conversion under dynamic load conditions. | Use Scenario: Continuous ECG acquisition node powered by rechargeable Li-Poly battery. IC Role / Device Role / Timing Role: Regulated 1.8 V supply for ultra-low-power MCU and analog signal conditioning. Use Value: Thermal shutdown activation at ~160°C prevents overheating during extended charging cycles while maintaining safe skin-contact temperature limits. |
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-1802E/TT | 2.0 µA IQ, 6 V max input, SOT-23-5 package - smaller footprint but lower 250 mA current rating | Preferred for space-constrained wearables where 250 mA headroom is needed over 150 mA | Select if PCB area is critical and thermal design permits SOT-23-5 power dissipation limits |
| Torex XC6206P182MR-G | 1.0 µA IQ, 6 V max input, SOT-25 package - lower IQ but no enable pin and ±3.0% output tolerance | Suitable for always-on, non-controlled rails where enable sequencing is unnecessary | Select when lowest possible standby current is mandatory and enable control is not required |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP561SN18T1 offers balanced trade-offs: moderate IQ (3.0 µA), integrated enable, tight 2.0% output accuracy, and proven TSOP-5 thermal performance-making it optimal for mid-complexity portable instrumentation where reliability and design margin matter.
Availability
NCP561SN18T1 is available at Aetrix Electronics and suitable for battery-powered instruments, hand-held test equipment, camcorders and cameras, and wearable health monitors requiring stable component supply across production lifecycles.
Supply support for NCP561SN18T1 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 NCP561 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for ultra-low-power portable electronics where battery longevity, small form factor, and robustness under variable load and temperature are primary design constraints.
FAQ
What is the maximum input voltage rating for the NCP561SN18T1?
The NCP561SN18T1 has an absolute maximum input voltage of 6.0 V. Exceeding this value risks permanent damage. For reliable operation, the recommended input range is 2.0 V to 5.5 V-ensuring sufficient headroom above the 1.8 V output while staying within thermal and dropout limits. The device includes internal protection against transient overvoltage, but sustained operation above 6.0 V is not supported.
Does the NCP561SN18T1 require an external capacitor on the output pin?
Yes, the NCP561SN18T1 requires a minimum 1.0 µF output capacitor for stability-ceramic or tantalum types are both supported. This capacitor suppresses load transients and reduces output noise. Larger values (e.g., 10 µF) improve load regulation and noise rejection but are not mandatory. The device does not require a specific ESR range, unlike older LDO architectures, simplifying capacitor selection and reducing BOM cost.
Can the NCP561SN18T1 be used without connecting the Enable pin?
Yes-the Enable pin of the NCP561SN18T1 can be left unconnected only if tied directly to VIN via a short trace or 0 Ω resistor. Floating the Enable pin is not recommended, as it may cause unpredictable startup or oscillation. When unused, connecting Enable to VIN ensures continuous operation and avoids unintended shutdown due to leakage or noise coupling. No external pull-up resistor is needed since VIN provides the required logic-high level.
What is the dropout voltage of the NCP561SN18T1 at 100 mA load and –40°C?
At –40°C and 100 mA load, the NCP561SN18T1 dropout voltage is ≤240 mV, per the Electrical Characteristics table (2.5 V–2.7 V output group, which includes 1.8 V at cold temperature). This value reflects worst-case behavior under extreme conditions and ensures functional regulation even in low-temperature industrial environments-critical for outdoor instrumentation or automotive cabin applications.
Is the NCP561SN18T1 RoHS-compliant and halogen-free?
Yes, the NCP561SN18T1 is RoHS-compliant and halogen-free. The "G" suffix variant (NCP561SN18T1G) explicitly denotes Pb-free packaging, but even the standard NCP561SN18T1 meets RoHS Directive 2011/65/EU requirements. Full material declarations and compliance documentation-including IEC 61249-2-21 and JEDEC J-STD-020 moisture sensitivity level (MSL3)-are available through onsemi's official product page and Aetrix Electronics' quality portal.
NCP561SN18T1 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):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.36V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1 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
NCP561SN18T1 FAQ
1.How can I place an order for NCP561SN18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP561SN18T1 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 NCP561SN18T1 reliable?
The price and inventory of NCP561SN18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP561SN18T1 is usually 5 days.
3.What payment methods are accepted for NCP561SN18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP561SN18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP561SN18T1?
NCP561SN18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP561SN18T1 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 NCP561SN18T1?
For technical support, including NCP561SN18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP561SN18T1 requirements.
6.How does Aetrix verify that NCP561SN18T1 is sourced from the original manufacturer or authorized distributors?
All NCP561SN18T1 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 NCP561SN18T1 meets industry standards.
7.What is the process for return or replacement of NCP561SN18T1?
All NCP561SN18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP561SN18T1, 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 NCP561SN18T1 part is unused and in its original packaging.
Return procedure for NCP561SN18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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