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onsemi NCP561SN18T1G
- Part No.:
- NCP561SN18T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP561SN18T1G.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
NCP561SN18T1G 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 NCP561SN18T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 150 mA, thermal shutdown behavior, enable logic threshold compatibility, and TSOP-5 package suitability for space-constrained portable PCB layouts.
Technical Context
The NCP561SN18T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/current limit protection - enabling stable regulation with ceramic output capacitors as low as 1.0 µF. Its enable input supports active-high logic control with 1.3 V turn-on and 0.2 V turn-off thresholds.
Designed for operation across –40°C to +85°C ambient, it delivers 1.8 V output with <100 ppm/°C temperature coefficient and 60 µVRMS output noise (20 Hz–100 kHz). Dropout voltage remains ≤240 mV over full temperature range at 150 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% - ensures compatible rail for 1.8 V logic, microcontrollers, and RF front-ends without external feedback. |
| Max Output Current | 150 mA - sufficient to power baseband processors, sensors, or display drivers in portable devices. |
| Dropout Voltage | 170 mV typ. @ 150 mA - enables regulation from 1.97 V input, extending battery runtime in single-cell Li-ion or NiMH systems. |
| Quiescent Current | 3.0 µA typ. - minimizes battery drain during sleep mode; ground current rises to only 4.0 µA at 150 mA load. |
| Enable Threshold | VTH(HI) = 1.3 V, VTH(LO) = 0.2 V - compatible with 1.8 V GPIO without level-shifting. |
| Thermal Protection | Activates at ~160°C junction - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Input Voltage Range | 1.8 V to 6.0 V - supports direct connection to Li-ion (3.0–4.2 V), alkaline (2×), or regulated intermediate rails. |
Pinout & Package
Housed in a Pb-free TSOP-5 surface-mount package (3.0 mm × 1.5 mm × 0.95 mm), the NCP561SN18T1G uses a standard 5-pin configuration optimized for minimal board area and thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts up to 6.0 V; requires local 1.0 µF decoupling capacitor placed adjacent to pin. |
| 2 - GND | Power ground reference | Low-impedance return path for input/output currents; must connect directly to solid ground plane. |
| 3 - Enable | Active-high enable control | Pull ≥1.3 V to activate regulator; pull ≤0.2 V to disable (IQ drops to 0.1 µA). |
| 4 - N/C | No internal connection | Not bonded; must remain unconnected - no routing or copper fill allowed. |
| 5 - VOUT | Regulated 1.8 V output | Delivers up to 150 mA; requires ≥1.0 µF ceramic output capacitor with ESR ≤3 Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 3.0 µA typical - extends shelf life and operational time in always-on sensor nodes and wearables. |
| Ceramic-capacitor stable | Works with 1.0 µF X5R/X7R ceramics - eliminates need for tantalum, reducing BOM cost and failure risk. |
| Integrated protection | Current limit + thermal shutdown - avoids external circuitry for short-circuit or overheating events. |
| Precision enable interface | 1.3 V logic-high threshold - interfaces directly with 1.8 V I/O domains without level shifters. |
| Industrial temp range | –40°C to +85°C operation - qualified for use in outdoor instrumentation and automotive cabin electronics. |
Applications
| Portable Medical Sensors | Wireless Remote Controls |
|---|---|
Use Scenario: Compact pulse oximeter with BLE radio and analog front-end operating from coin cell or AAA batteries. IC Role / Device Role / Timing Role: Primary 1.8 V supply for MCU, ADC, and RF transceiver - maintaining regulation down to end-of-battery voltage. Use Value: 3.0 µA quiescent current preserves battery capacity during multi-week standby; 170 mV dropout enables >20% extra runtime vs. older LDOs. |
Use Scenario: Sub-GHz remote control using 2× alkaline cells (2.4–3.2 V) powering 1.8 V logic and RF SoC. IC Role / Device Role / Timing Role: Point-of-load regulator converting raw battery voltage to clean, noise-immune 1.8 V rail. Use Value: 60 µVRMS output noise prevents RF desensitization; enable pin allows MCU-controlled deep-sleep mode. |
| Industrial Handheld Scanners | Smart Home Motion Sensors |
Use Scenario: Rugged barcode scanner with laser diode driver and image sensor, powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Secondary 1.8 V regulator for digital core, isolated from noisy motor and laser drive circuits. Use Value: Thermal shutdown protects against enclosure heat buildup during continuous scanning; TSOP-5 footprint saves space on dense mainboard. |
Use Scenario: PIR-based occupancy sensor with Zigbee SoC and flash memory, running on CR2032 coin cell. IC Role / Device Role / Timing Role: Always-on LDO supplying real-time clock, wake-up comparator, and low-power MCU core. Use Value: ±2.0% output accuracy ensures reliable brown-out detection; 1.0 µF ceramic compatibility reduces component height for slim housing. |
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/MB | 2.0 µA IQ, 6 V max input, but only 250 mA dropout at 250 mA - higher dropout than NCP561SN18T1G at same load. | Optimized for ultra-low-IQ microcontroller cores; less suitable for 150 mA burst loads like RF transmit. | Prefer when IQ < 2.5 µA is mandatory and peak load ≤100 mA. |
| Torex XC6206P182MR-G | 1.0 µA IQ, SOT-23-5 package, but ±3.0% output tolerance and no enable pin - lacks control flexibility. | Best for simple always-on rails where enable sequencing or tight voltage accuracy is not required. | Choose when board space is tighter than TSOP-5 and enable functionality is unnecessary. |
Compared with MCP1700T-1802E/MB and XC6206P182MR-G, the NCP561SN18T1G uniquely balances 3.0 µA IQ, 150 mA capability, ±2.0% accuracy, and active enable - making it optimal for portable systems needing both low standby power and robust dynamic performance.
Availability
NCP561SN18T1G is available at Aetrix Electronics and suitable for portable medical sensors, wireless remote controls, industrial handheld scanners, and smart home motion sensors requiring stable component supply with Pb-free compliance and industrial temperature support.
Supply support for NCP561SN18T1G 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, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The NCP561 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for battery-powered portable equipment demanding ultralow quiescent current, ceramic-capacitor stability, and compact packaging.
FAQ
What is the maximum input voltage rating for the NCP561SN18T1G?
The NCP561SN18T1G has an absolute maximum input voltage of 6.0 V. Exceeding this rating may cause permanent damage. For inputs above 6.0 V, a pre-regulator stage (e.g., resistive divider + Zener or upstream buck converter) is required - as shown in Figure 17 of the official datasheet. The NCP561SN18T1G itself must never see more than 6.0 V at VIN.
Does the NCP561SN18T1G require an external resistor network to set output voltage?
No. The NCP561SN18T1G is a fixed-output regulator with internally trimmed 1.8 V reference. It contains on-die resistors for feedback and requires no external components to configure voltage. This simplifies layout, improves accuracy, and eliminates drift from external resistor tolerances - unlike adjustable LDOs such as the NCP1117.
Can the NCP561SN18T1G be used with a 1.0 µF ceramic capacitor on the output?
Yes. The NCP561SN18T1G is explicitly designed to be stable with 1.0 µF ceramic capacitors (X5R/X7R), as confirmed in the Applications Information section. It does not require minimum ESR, unlike older LDO architectures. Larger values (e.g., 10 µF) further improve load transient response and noise rejection - but 1.0 µF is the verified minimum.
What happens to quiescent current when the NCP561SN18T1G is disabled via the Enable pin?
When the Enable pin is pulled below 0.2 V, the NCP561SN18T1G enters shutdown mode and draws only 0.1 µA typical quiescent current - effectively disconnecting the pass element. This is critical for long-term storage or ultra-low-power sleep states. Re-enabling restores full regulation within microseconds, as shown in Figure 11.
Is thermal shutdown in the NCP561SN18T1G automatically reset after cooling?
Yes. The NCP561SN18T1G features automatic thermal shutdown recovery: once junction temperature falls below the hysteresis threshold (~140°C), regulation resumes without external intervention. This self-recovering behavior prevents latch-up during temporary overloads or inadequate heatsinking - a key reliability feature for unattended portable devices.
NCP561SN18T1G 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
NCP561SN18T1G FAQ
1.How can I place an order for NCP561SN18T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP561SN18T1G 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 NCP561SN18T1G reliable?
The price and inventory of NCP561SN18T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP561SN18T1G is usually 5 days.
3.What payment methods are accepted for NCP561SN18T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP561SN18T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP561SN18T1G?
NCP561SN18T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP561SN18T1G 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 NCP561SN18T1G?
For technical support, including NCP561SN18T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP561SN18T1G requirements.
6.How does Aetrix verify that NCP561SN18T1G is sourced from the original manufacturer or authorized distributors?
All NCP561SN18T1G 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 NCP561SN18T1G meets industry standards.
7.What is the process for return or replacement of NCP561SN18T1G?
All NCP561SN18T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP561SN18T1G, 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 NCP561SN18T1G part is unused and in its original packaging.
Return procedure for NCP561SN18T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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