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onsemi NCP551SN25T1
- Part No.:
- NCP551SN25T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP551SN25T1.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
NCP551SN25T1 from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 2.5 V at up to 150 mA with ultra-low quiescent current (4.0 µA typical), PMOS pass transistor architecture, and ±2.0% output voltage accuracy over temperature. It operates from 2.6 V to 12 V input and is designed for battery-powered portable instrumentation requiring stable low-power bias.
For engineers reviewing the NCP551SN25T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (130 mV at 10 mA), enable control logic threshold (0.3 V low / 1.3 V high), thermal shutdown (160 °C), TSOP-5 package compatibility, and ceramic capacitor stability (0.1 µF min).
Technical Context
The NCP551SN25T1 integrates a precision voltage reference, error amplifier, and PMOS power transistor in a single TSOP-5 package. Its enable input supports active-high logic control with hysteresis-free threshold switching, and internal protection includes current limiting and thermal shutdown.
It achieves regulation using a PMOS pass element-enabling near-zero dropout at light loads-and maintains stability with ceramic output capacitors as low as 0.1 µF. The device's ground current remains constant (~4.0 µA) across load and input voltage variations when enabled and unloaded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2.0% over −40 °C to +85 °C - ensures precise biasing for analog sensors and low-voltage microcontrollers |
| Max Input Voltage | 12 V - supports direct connection to 9 V batteries or unregulated wall adapters without pre-regulation |
| Quiescent Current | 4.0 µA typical - enables multi-year operation in coin-cell–powered IoT endpoints |
| Dropout Voltage | 130 mV at 10 mA - allows regulation down to Vin = 2.63 V for 2.5 V output, maximizing battery utilization |
| Load Regulation | 65 mV max (10 mA → 150 mA) - maintains tight output under dynamic sensor/RF load transients |
| Line Regulation | 30 mV max (Vin = Vout+1 V → 12 V) - rejects ripple from noisy DC-DC converters or shared supply rails |
| Enable Threshold | VEN(HI) = 1.3 V, VEN(LO) = 0.3 V - compatible with 1.8 V/3.3 V GPIO without level-shifting |
Pinout & Package
The NCP551SN25T1 is housed in a 5-pin TSOP-5 (SOT-23-5, Case 483) surface-mount package measuring 3.00 × 1.50 × 0.95 mm with 0.95 mm pitch. Thermal resistance RJA is 250 °C/W on 1 oz copper (100 mm² pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply - must be decoupled with ≥0.1 µF ceramic capacitor placed adjacent to pin |
| 2 | GND | Power ground reference - requires low-impedance PCB trace to minimize noise coupling into regulation loop |
| 3 | Enable | Active-high digital control - pulled to Vin for always-on operation; driven low to reduce IQ to <1 µA standby |
| 4 | N/C | No internal connection - must remain floating or grounded; no routing or soldering required |
| 5 | Vout | Regulated 2.5 V output - requires ≥0.1 µF ceramic capacitor; ESR up to 3 Ω supported for transient robustness |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 4.0 µA typical - extends battery life in always-on wearable health monitors |
| PMOS pass transistor | Enables 130 mV dropout at 10 mA - sustains regulation through deep battery discharge (e.g., 2.6 V Li-MnO₂) |
| Ceramic capacitor stability | Stable with 0.1 µF min output capacitance - eliminates need for tantalum or electrolytic caps, reducing BOM cost and size |
| Integrated thermal shutdown | Triggers at ~160 °C junction - prevents damage during sustained overload or poor PCB heatsinking |
| ±2.0% output accuracy | Over full industrial temperature range - eliminates need for external trimming in precision ADC reference supplies |
Applications
| Battery-Powered Instrumentation | Hand-Held Test Equipment |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2 V range) requiring stable 2.5 V reference for 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary LDO providing clean, low-noise 2.5 V supply to ADC reference input and microcontroller core. Use Value: 130 mV dropout enables full ADC accuracy down to 2.63 V input, extending usable battery life by >25% versus higher-dropout alternatives. | Use Scenario: Handheld oscilloscope probe interface module with embedded signal conditioning and BLE wireless upload. IC Role / Device Role / Timing Role: Power management IC supplying regulated 2.5 V to op-amp front-end and RF transceiver logic. Use Value: 4.0 µA quiescent current minimizes standby drain, enabling >6-month shelf life with CR2032 coin cell. |
| Camcorder Image Sensor Bias | Low-Power Industrial Sensor Node |
Use Scenario: CMOS image sensor in compact camcorder requiring noise-immune 2.5 V analog supply independent of main 3.3 V digital rail. IC Role / Device Role / Timing Role: Dedicated low-noise LDO isolating sensitive analog pixel array from digital switching noise. Use Value: Ceramic-capacitor compatibility and 65 mV load regulation suppress supply-induced fixed-pattern noise in captured video. | Use Scenario: Wireless temperature node using ultra-low-power MCU and MEMS sensor, operating from primary lithium thionyl chloride (LiSOCl₂) cell. IC Role / Device Role / Timing Role: System power regulator enabling MCU sleep modes with sub-µA system leakage. Use Value: Enable pin allows MCU to gate NCP551SN25T1 power during deep-sleep, reducing total system IQ to <500 nA. |
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-2502E/MB | Higher dropout (250 mV @ 250 mA), 2.0 µA IQ, SOT-23-3 (no enable) | Lacks enable pin and N/C terminal; limited to always-on use cases | Select if board space is constrained and enable functionality is unnecessary |
| TPS7A0525PDBVR | Lower IQ (250 nA), 170 mV dropout @ 100 mA, same TSOP-5 footprint but different pinout (Enable on Pin 3 vs Pin 3 on NCP551SN25T1) | Requires PCB redesign due to non-pin-compatible enable placement and different GND/Vout assignment | Select only for ultra-low-power designs where layout revision is acceptable |
Compared with MCP1700T-2502E/MB and TPS7A0525PDBVR, the NCP551SN25T1 uniquely balances ultra-low IQ, low dropout, integrated enable, and TSOP-5 compatibility - making it optimal for space-constrained, battery-gated portable instrumentation where pinout retention and thermal robustness are critical.
Availability
NCP551SN25T1 is available at Aetrix Electronics and suitable for battery-powered instrumentation, hand-held test equipment, and camcorder sensor biasing requiring stable component supply with guaranteed long-term manufacturability.
Supply support for NCP551SN25T1 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP551 series belongs to onsemi's precision analog power management portfolio, engineered specifically for ultra-low-power portable electronics where extended battery life, small footprint, and ceramic capacitor compatibility are mandatory design requirements.
FAQ
What is the maximum input voltage rating for the NCP551SN25T1?
The NCP551SN25T1 has a maximum input voltage rating of 12 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For inputs exceeding 12 V, an external pre-regulator circuit (e.g., resistive divider + Zener or discrete transistor stage) is required before the NCP551SN25T1 input pin.
Does the NCP551SN25T1 require an external pull-up resistor on the Enable pin?
No, the NCP551SN25T1 does not require an external pull-up on the Enable pin. When unused, the Enable pin must be connected directly to Vin to ensure the device remains enabled. Internal circuitry does not provide pull-up; leaving Enable floating may cause erratic operation or unintended shutdown.
What is the minimum output capacitor value recommended for stable operation of the NCP551SN25T1?
The NCP551SN25T1 requires a minimum output capacitor of 0.1 µF ceramic, placed as close as possible to the Vout and GND pins. This value ensures stability across all load conditions and supports fast load transient response. Larger values (e.g., 1–10 µF) further improve noise rejection and transient suppression without compromising stability.
Is the NCP551SN25T1 RoHS compliant and lead-free?
Yes, the NCP551SN25T1 is RoHS compliant and lead-free. Per the datasheet ordering information, the "G" suffix (as in NCP551SN25T1G) denotes Pb-Free packaging, and the device meets EU RoHS Directive 2011/65/EU requirements. The marking diagram also confirms the Pb-Free indicator ("G" or microdot) is present.
What is the thermal shutdown trigger temperature for the NCP551SN25T1?
The NCP551SN25T1 incorporates internal thermal shutdown that activates at approximately 160 °C junction temperature. Once triggered, the device disables output until junction temperature falls below the hysteresis threshold (~140 °C), protecting against permanent damage during sustained overload or inadequate PCB thermal relief.
NCP551SN25T1 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):
- 12V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.22V @ 10mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 8 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
NCP551SN25T1 FAQ
1.How can I place an order for NCP551SN25T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP551SN25T1 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 NCP551SN25T1 reliable?
The price and inventory of NCP551SN25T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP551SN25T1 is usually 5 days.
3.What payment methods are accepted for NCP551SN25T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP551SN25T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP551SN25T1?
NCP551SN25T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP551SN25T1 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 NCP551SN25T1?
For technical support, including NCP551SN25T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP551SN25T1 requirements.
6.How does Aetrix verify that NCP551SN25T1 is sourced from the original manufacturer or authorized distributors?
All NCP551SN25T1 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 NCP551SN25T1 meets industry standards.
7.What is the process for return or replacement of NCP551SN25T1?
All NCP551SN25T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP551SN25T1, 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 NCP551SN25T1 part is unused and in its original packaging.
Return procedure for NCP551SN25T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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