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onsemi NCP561SN25T1
- Part No.:
- NCP561SN25T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP561SN25T1.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
NCP561SN25T1 from onsemi is a fixed 2.5 V, 150 mA CMOS low-dropout linear regulator in TSOP-5 package, featuring 3.0 µA typical quiescent current, 170 mV dropout at full load, and ±2.0% output voltage accuracy - designed for battery-powered portable instruments requiring ultra-low standby power.
For engineers reviewing the NCP561SN25T1 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/3.3 V logic, and ceramic capacitor stability with ≥1.0 µF output capacitance.
Technical Context
The NCP561SN25T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal shutdown circuitry - enabling stable regulation without external compensation. Its ultralow IQ architecture relies on CMOS biasing rather than bipolar circuitry, minimizing ground current across temperature and load.
It operates with input voltages from 2.8 V to 6.0 V and delivers regulated 2.5 V output with line regulation ≤20 mV and load regulation ≤60 mV. The enable pin supports logic-level control (VTH(HI) = 1.3 V, VTH(LO) = 0.2 V), and internal current limiting caps short-circuit output at 400 mA (for 2.5 V variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2.0% - ensures compatible rail for 2.5 V logic, ADC references, and low-voltage microcontrollers. |
| Max Output Current | 150 mA - sufficient for single-core MCUs, sensors, and RF front-end biasing in portable systems. |
| Dropout Voltage | 170 mV at 150 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min) with margin. |
| Quiescent Current | 3.0 µA typical - extends battery life in always-on monitoring modes (e.g., RTC backup, wake-on-event circuits). |
| Operating Temp | –40°C to +85°C - qualified for industrial handhelds, medical monitors, and outdoor instrumentation. |
| Enable Threshold | 1.3 V (turn-on), 0.2 V (turn-off) - compatible with 1.8 V I/O domains and open-drain microcontroller GPIOs. |
| Noise (20 Hz–100 kHz) | 60 µVRMS - low enough for analog sensor signal chains and precision reference buffering. |
Pinout & Package
Package: TSOP-5 (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch), surface-mount, Pb-free option available (NCP561SN25T1G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 2.8–6.0 V unregulated input; requires local 1.0 µF ceramic decoupling per datasheet Figure 13. |
| 2 - GND | Power ground reference | Low-impedance return path for input/output currents; must be routed with wide copper to minimize noise coupling. |
| 3 - Enable | Logic-controlled regulator enable | 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 - no routing or soldering allowed to avoid parasitic coupling. |
| 5 - VOUT | Regulated 2.5 V output | Stable output with ≥1.0 µF ceramic or tantalum capacitor; ESR up to 3.0 Ω supported without instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.0 µA typical - enables multi-year battery life in IoT endpoint nodes with periodic wake-up intervals. |
| PMOS pass element | No body diode reverse conduction - prevents backfeed from VOUT to VIN during input brownout or hot-swap events. |
| Thermal shutdown protection | Activates at ~160°C junction temperature - safeguards against PCB layout errors or sustained overload conditions. |
| Ceramic capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics in space-constrained designs. |
| Industrial temperature range | –40°C to +85°C operation - validated across full range for output voltage drift ≤±0.5% and dropout increase ≤20%. |
Applications
| Battery-Powered Medical Monitors | Portable Test & Measurement Instruments |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition in handheld patient monitors powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Supplies clean, stable 2.5 V reference and analog front-end bias for 16-bit ADCs and op-amps. Use Value: 60 µVRMS noise and ±2.0% output accuracy preserve signal integrity; 3.0 µA IQ extends battery runtime beyond 12 months in sleep mode. |
Use Scenario: Multifunction handheld DMMs with LCD display, MCU, and isolated serial interface. IC Role / Device Role / Timing Role: Regulates 2.5 V rail for precision voltage reference ICs (e.g., REF5025) and SAR ADCs. Use Value: 170 mV dropout allows operation down to 2.67 V input - critical for maintaining accuracy as battery discharges from 3.6 V to 2.8 V. |
| Wireless Sensor Node Transceivers | Industrial Handheld Scanners |
|
Use Scenario: Sub-GHz LoRaWAN node with ultra-low-power MCU, RF transceiver, and environmental sensors. IC Role / Device Role / Timing Role: Powers RF IC bias rails and digital logic during brief transmit bursts; disabled between transmissions. Use Value: Enable pin with 1.3 V threshold interfaces directly with 1.8 V MCU GPIO; 0.1 µA shutdown current minimizes leakage in deep-sleep states. |
Use Scenario: Rugged barcode scanners used in warehouse environments with frequent drop/shock exposure. IC Role / Device Role / Timing Role: Provides 2.5 V supply for CMOS image sensor, laser driver, and decode ASIC. Use Value: –40°C to +85°C rating ensures reliable startup and regulation in cold storage or hot loading docks; thermal shutdown prevents latch-up under mechanical stress-induced heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-2502E/TO | 250 mA output, 1.6 µA IQ, SOT-23-5 package - higher current but larger footprint and no enable pin. | Lacks enable control; unsuitable for dynamic power gating in duty-cycled systems. | Choose when higher output current is needed and enable functionality is not required. |
| Torex XC6206P252MR-G | 150 mA, 1.0 µA IQ, SOT-25 package - lower IQ but only 1% initial accuracy and no thermal shutdown. | No overtemperature protection; less robust in thermally constrained enclosures. | Choose for lowest possible standby power where thermal risk is mitigated externally. |
Compared with MCP1700-2502E/TO and XC6206P252MR-G, the NCP561SN25T1 uniquely balances ultra-low IQ (3.0 µA), integrated enable, thermal shutdown, and ±2.0% accuracy in a compact TSOP-5 - making it optimal for space- and power-constrained portable instrumentation where reliability and controllability are co-prioritized.
Availability
NCP561SN25T1 is available at Aetrix Electronics and suitable for battery-powered medical monitors, portable test equipment, wireless sensor nodes, and industrial handheld scanners requiring stable component supply across long production lifecycles.
Supply support for NCP561SN25T1 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 NCP561SN25T1 belongs to onsemi's low-IQ LDO regulator product line - engineered specifically for portable and battery-operated systems where extended operating life, small form factor, and robust thermal performance are essential design requirements.
FAQ
What is the maximum input voltage for NCP561SN25T1?
The NCP561SN25T1 supports a maximum input voltage of 6.0 V, as specified in its Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage. For inputs above 6.0 V, an external pre-regulator (e.g., resistive divider + Zener or series transistor stage) is required - as shown in Figure 17 of the datasheet. Operation at 6.0 V is valid only when thermal limits are observed and ambient temperature remains within specification.
Does NCP561SN25T1 require an external output capacitor, and what type is recommended?
Yes, the NCP561SN25T1 requires a minimum 1.0 µF output capacitor for stability, as confirmed in the Applications Information section. Ceramic capacitors (X5R/X7R dielectrics) are explicitly recommended and fully supported - including low-ESR types down to a few milliohms. Tantalum capacitors are also acceptable. The device does not require a minimum ESR, unlike older LDO architectures, simplifying BOM and layout.
Can NCP561SN25T1 be used without connecting the Enable pin?
Yes - the NCP561SN25T1 can operate without external enable control. Per the Pin Function Description, if the Enable pin is unused, it must be tied directly to VIN to ensure the regulator remains enabled. Leaving it floating is prohibited and may cause erratic output behavior due to noise susceptibility or partial turn-on states.
What is the dropout voltage of NCP561SN25T1 at 100 mA and 85°C?
At 100 mA and 85°C, the dropout voltage of NCP561SN25T1 is ≤230 mV, based on the Electrical Characteristics table (2.5 V–2.7 V range, max value column). This is derived from the datasheet's graded dropout specification: 230 mV max for 2.5 V–2.7 V outputs at full temperature range and 150 mA load - and dropout decreases linearly with reduced load, so 100 mA yields ≤230 mV.
Is NCP561SN25T1 RoHS-compliant and halogen-free?
Yes - the NCP561SN25T1 is RoHS-compliant and halogen-free. The "G" suffix variant (NCP561SN25T1G) explicitly denotes Pb-free packaging, and the datasheet confirms Pb-free packages are available. onsemi's standard manufacturing process for this family meets JEDEC J-STD-609 Category 1 (halogen-free) and RoHS Directive 2011/65/EU requirements.
NCP561SN25T1 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 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
NCP561SN25T1 FAQ
1.How can I place an order for NCP561SN25T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP561SN25T1 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 NCP561SN25T1 reliable?
The price and inventory of NCP561SN25T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP561SN25T1 is usually 5 days.
3.What payment methods are accepted for NCP561SN25T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP561SN25T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP561SN25T1?
NCP561SN25T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP561SN25T1 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 NCP561SN25T1?
For technical support, including NCP561SN25T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP561SN25T1 requirements.
6.How does Aetrix verify that NCP561SN25T1 is sourced from the original manufacturer or authorized distributors?
All NCP561SN25T1 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 NCP561SN25T1 meets industry standards.
7.What is the process for return or replacement of NCP561SN25T1?
All NCP561SN25T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP561SN25T1, 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 NCP561SN25T1 part is unused and in its original packaging.
Return procedure for NCP561SN25T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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