My Inquiry
My Account
onsemi NCP551SN31T1G
- Part No.:
- NCP551SN31T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP551SN31T1G.pdf
- Description:
- IC REG LINEAR 3.1V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:155
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP551SN31T1G from onsemi is a fixed-output, CMOS low-dropout linear regulator delivering 3.1 V at up to 150 mA with ultra-low 4.0 µA quiescent current, housed in a TSOP-5 package. It integrates PMOS pass transistor, thermal shutdown, and current limit protection, and is optimized for battery-powered portable instruments requiring stable low-power voltage regulation.
For engineers reviewing the NCP551SN31T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its 3.1 V output accuracy (±2.0%), 12 V max input, 150 mV typical dropout at 10 mA, enable-controlled standby mode, and compatibility with 0.1 µF ceramic output capacitors.
Technical Context
The NCP551SN31T1G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuitry-enabling stable regulation without external compensation. Its enable pin provides logic-level control (VTH(HI) = 1.3 V, VTH(LO) = 0.3 V) to disable output and reduce ground current to <1 µA.
Designed for low-noise, low-power operation, it achieves ±100 ppm/°C output voltage temperature coefficient and supports line transient response within ±600 mV (for 100 mA load step), with thermal shutdown activating at ~160 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1 V ±2.0% (ensures stable supply for 3.3 V I/O-tolerant microcontrollers and sensors) |
| Max Input Voltage | 12 V (supports single-cell Li-ion, dual-cell alkaline, or regulated 9 V rails) |
| Dropout Voltage | 150 mV typical at 10 mA (enables regulation down to Vin = 3.25 V for full 3.1 V output) |
| Quiescent Current | 4.0 µA typical (extends battery life in always-on monitoring circuits) |
| Operating Temp Range | −40 °C to +85 °C (suitable for industrial handhelds and consumer electronics) |
| Output Current | 150 mA continuous (powers multiple low-power peripherals such as BLE radios and ADCs) |
| Enable Threshold | 1.3 V (logic-high turn-on; compatible with 1.8 V and 3.3 V GPIOs) |
Pinout & Package
Package: TSOP-5 (SOT-23-5, Case 483), 3.00 × 1.50 × 0.95 mm, Pb-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply (0–12 V); requires local 0.1 µF decoupling capacitor |
| 2 | GND | Power ground reference; must be low-impedance connection to minimize noise |
| 3 | Enable | Active-high digital control input; pull to Vin for always-on operation |
| 4 | N/C | No internal connection; leave unconnected or float (not tied to GND/Vin) |
| 5 | Vout | Regulated 3.1 V output; minimum 0.1 µF ceramic capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 4.0 µA typical enables >1-year battery life in 10 µA average-current IoT sensors |
| Stable with ceramic capacitors | 0.1 µF minimum output capacitance eliminates need for tantalum or high-ESR caps |
| Integrated protection | Thermal shutdown (~160 °C) and current limiting prevent damage during overload or ambient rise |
| Precision output voltage | ±2.0% initial accuracy over temperature ensures reliable logic-level compliance for 3.3 V systems |
| Low dropout architecture | 150 mV typical dropout allows operation from depleting batteries down to 3.25 V input |
Applications
| Battery-Powered Instrumentation | Hand-Held Test Equipment |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Primary 3.1 V supply for MCU, display driver, and analog front-end. Use Value: Maintains regulation through battery discharge curve while drawing only 4 µA in sleep mode. |
Use Scenario: Pocket-sized oscilloscope with integrated Li-ion battery and USB charging. IC Role / Device Role / Timing Role: Clean 3.1 V rail for precision ADC reference and FPGA configuration logic. Use Value: Delivers 150 mA peak current during acquisition with <600 mV line transient deviation. |
| Camcorder Power Management | Wireless Sensor Node |
Use Scenario: Compact camcorder using single-cell Li-ion (3.0–4.2 V) with image sensor and video encoder. IC Role / Device Role / Timing Role: Secondary regulated rail for sensor bias and memory interface. Use Value: Enables use of low-cost 0.1 µF ceramic cap instead of bulkier tantalum, reducing BOM cost and board area. |
Use Scenario: Zigbee-enabled environmental monitor operating on CR2032 coin cell (2.0–3.0 V). IC Role / Device Role / Timing Role: Always-on LDO supplying real-time clock and wake-up controller. Use Value: Achieves 4 µA ground current in standby-critical for multi-year deployment without maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3102E/TT | 3.1 V output, 250 mA rating, 1.6 µA quiescent current, SOT-23-3 package (no enable pin) | Lacks enable control and thermal shutdown; lower max input (6 V) | Choose when ultra-low IQ dominates and enable/thermal features are unnecessary |
| TNIV551SN31T1G | Same electrical specs and pinout; automotive-grade variant (AEC-Q100 qualified, −40 °C to +125 °C) | Qualified for automotive infotainment and ADAS modules requiring PPAP documentation | Choose for automotive designs needing extended temperature range and qualification traceability |
Compared with MCP1700T-3102E/TT, NCP551SN31T1G adds enable control and thermal protection at higher IQ; compared with TNIV551SN31T1G, it offers identical performance at industrial-grade temperature range and lower cost for non-automotive use.
Availability
NCP551SN31T1G is available at Aetrix Electronics and suitable for battery-powered instrumentation, hand-held test equipment, and wireless sensor nodes requiring stable component supply across production lifecycles.
Supply support for NCP551SN31T1G 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 power and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The NCP551 series belongs to onsemi's precision analog LDO portfolio, designed specifically for ultra-low-power, space-constrained portable electronics where battery longevity and small-footprint regulation are critical.
FAQ
What is the output voltage tolerance of the NCP551SN31T1G over temperature?
The NCP551SN31T1G maintains output voltage within ±2.0% over the full industrial temperature range (−40 °C to +85 °C) at 10 mA load. This specification is guaranteed per the datasheet's Electrical Characteristics table and ensures compatibility with 3.3 V logic families even under thermal stress.
Can the NCP551SN31T1G operate with an input voltage below 3.1 V?
No-the NCP551SN31T1G requires a minimum input voltage above its dropout threshold. At 10 mA load, dropout is typically 150 mV, so Vin must exceed 3.25 V to sustain 3.1 V output. Below that, regulation fails and Vout drops linearly with Vin.
Is the Enable pin of the NCP551SN31T1G 5 V tolerant?
No-the Enable pin absolute maximum rating is Vin + 0.3 V. With max Vin = 12 V, VEN must stay ≤12.3 V. However, it is not 5 V logic-tolerant by design; for 5 V microcontroller interfacing, a level-shifting resistor divider or open-drain buffer is recommended.
Does the NCP551SN31T1G require an output capacitor, and what type is recommended?
Yes-a minimum 0.1 µF ceramic capacitor is required on the Vout pin for stability. The datasheet confirms compatibility with low-ESR ceramics (including X5R/X7R) and permits larger values (e.g., 1–10 µF) to improve load transient response and noise rejection.
What is the thermal shutdown behavior of the NCP551SN31T1G?
The NCP551SN31T1G activates internal thermal shutdown at approximately 160 °C junction temperature, disabling the output until junction temperature falls by ~20 °C. This protects against sustained overloads or poor PCB thermal design, and recovery is automatic with no latch-up.
NCP551SN31T1G 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):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 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
NCP551SN31T1G FAQ
1.How can I place an order for NCP551SN31T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP551SN31T1G 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 NCP551SN31T1G reliable?
The price and inventory of NCP551SN31T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP551SN31T1G is usually 5 days.
3.What payment methods are accepted for NCP551SN31T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP551SN31T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP551SN31T1G?
NCP551SN31T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP551SN31T1G 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 NCP551SN31T1G?
For technical support, including NCP551SN31T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP551SN31T1G requirements.
6.How does Aetrix verify that NCP551SN31T1G is sourced from the original manufacturer or authorized distributors?
All NCP551SN31T1G 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 NCP551SN31T1G meets industry standards.
7.What is the process for return or replacement of NCP551SN31T1G?
All NCP551SN31T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP551SN31T1G, 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 NCP551SN31T1G part is unused and in its original packaging.
Return procedure for NCP551SN31T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP551SN31T1G Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
