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onsemi NCP512SQ31T1
- Part No.:
- NCP512SQ31T1
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP512SQ31T1.pdf
- Description:
- IC REG LDO LQC 80MA 3.1V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:16,180
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Product details
Overview
NCP512SQ31T1 from onsemi is a fixed-output CMOS low-quiescent-current linear voltage regulator delivering 3.1 V at up to 80 mA, featuring 40 µA typical quiescent current, 170 mV dropout at 80 mA, and ±2.0% output voltage accuracy - designed for battery-powered portable electronics requiring stable low-power rail generation.
For engineers reviewing the NCP512SQ31T1 datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low IQ, SC-88A (SOT-353) package compatibility, enable-controlled standby mode, and ceramic-capacitor stability in space-constrained handheld systems.
Technical Context
The NCP512SQ31T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/current-limit protection - enabling stable regulation with minimal external components. Its enable input supports logic-level control (VTH = 0.3 V low / 1.3 V high), and it operates across −40 °C to +85 °C ambient without requiring minimum load current.
Designed for low-ESR ceramic output capacitors (≥1.0 µF), the device achieves 50 dB ripple rejection at 1 kHz and exhibits 180 µV/√Hz output noise density. Dropout voltage remains ≤170 mV across full temperature range at 80 mA load, supporting operation from as low as 3.27 V input for 3.1 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1 V ±2.0% - tightly regulated rail for MCU core or sensor analog supply. |
| Quiescent Current | 40 µA typical - enables multi-year battery life in always-on IoT sensors. |
| Dropout Voltage | 170 mV at 80 mA - allows operation from single-cell Li-ion (3.27 V min input) or two-cell alkaline. |
| Max Output Current | 80 mA - sufficient for low-power microcontrollers, RF transceivers, or display bias rails. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial and consumer portable equipment environments. |
| Ripple Rejection | 50 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters. |
| Package | SC-88A (SOT-353), 5-pin surface-mount - 2.0 × 2.1 mm footprint for ultra-compact PCB layouts. |
Pinout & Package
The NCP512SQ31T1 is housed in the SC-88A (SOT-353) package - a 5-pin, 2.0 mm × 2.1 mm, 0.95 mm height micro-miniature surface-mount outline with gull-wing leads and Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply - accepts 3.27 V to 6.0 V; must be decoupled with ≥1.0 µF ceramic capacitor. |
| 2 | GND | Power ground reference - requires low-impedance PCB connection to minimize noise coupling. |
| 3 | Enable | Active-high digital control - pulls low to disable regulator (IQ < 0.1 µA); tie to Vin if unused. |
| 4 | N/C | No internal connection - left unconnected; no routing or soldering required. |
| 5 | Vout | Regulated 3.1 V output - drives load directly; requires ≥1.0 µF ceramic output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - extends battery runtime in always-on wearable devices. |
| Ceramic-capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic caps. |
| Enable-controlled shutdown | Reduces total system IQ to <0.1 µA - enables deep-sleep modes in firmware-controlled power sequencing. |
| Thermal & current protection | Internal foldback current limit and thermal shutdown at ~160 °C - prevents damage during overload or poor heatsinking. |
| Precision output accuracy | ±2.0% over −40 °C to +85 °C - ensures reliable operation of ADC references and analog front-ends. |
Applications
| Wearable Health Monitor | Bluetooth LE Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery. IC Role / Device Role / Timing Role: Provides clean 3.1 V analog supply for op-amp instrumentation amplifier and SAR ADC reference. Use Value: 40 µA IQ enables >3-year battery life; ±2.0% output accuracy maintains measurement linearity across temperature. |
Use Scenario: Intermittent environmental sensing (temp/humidity) with BLE advertising every 2 seconds. IC Role / Device Role / Timing Role: Supplies 3.1 V to BLE SoC and sensor IC during active transmit/receive bursts. Use Value: Enable pin synchronizes with MCU GPIO to cut regulator IQ during sleep, reducing average system current to sub-µA levels. |
| Portable Barcode Scanner | Smart Remote Control |
|
Use Scenario: Handheld scanner using laser diode and CMOS image sensor, powered by AA batteries. IC Role / Device Role / Timing Role: Generates stable 3.1 V rail for image sensor interface and microcontroller I/O bank. Use Value: 170 mV dropout allows operation down to 3.27 V input - extends usable battery range beyond 1.5 V/cell cutoff. |
Use Scenario: IR/RF remote with motion wake-up and button press transmission. IC Role / Device Role / Timing Role: Powers 3.1 V logic and RF transmitter; disabled between user interactions. Use Value: SC-88A package fits 8 mm × 12 mm PCB area; ceramic-capacitor compatibility avoids ESR-related instability in thin-film designs. |
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 IQ, SOT-23-3 package (no enable) | Lacks enable pin and thermal protection; higher max current but larger footprint | Choose when ultra-low IQ dominates and enable control is unnecessary. |
| TPS70631DBVR | 3.1 V output, 150 mA rating, 1.3 µA IQ, SOT-23-5 with enable and thermal shutdown | Higher IQ spec (1.3 µA vs 40 µA) but wider input range (2.7–6.5 V) and tighter initial accuracy (±0.5%) | Choose when tighter initial tolerance and broader VIN support outweigh quiescent current priority. |
Compared with MCP1700T-3102E/TT and TPS70631DBVR, the NCP512SQ31T1 offers the lowest quiescent current among SC-88A-packaged 3.1 V LDOs with integrated enable and thermal protection - making it optimal for compact, battery-limited designs where standby power is critical.
Availability
NCP512SQ31T1 is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, portable barcode scanners, smart remote controls, and other battery-powered portable electronics requiring stable component supply with long lifecycle visibility.
Supply support for NCP512SQ31T1 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP512 series belongs to onsemi's low-power linear regulator product line - engineered specifically for handheld communication and portable battery-powered devices demanding ultra-low quiescent current and small-footprint packaging.
FAQ
What is the maximum input voltage rating for the NCP512SQ31T1?
The NCP512SQ31T1 has an absolute maximum input voltage of 6.0 V. Operation above this level risks permanent damage. For reliable 3.1 V output, the recommended input range is 3.27 V (3.1 V + 170 mV dropout) to 6.0 V. Input voltage must remain within −0.3 V to Vin + 0.3 V at the Enable pin to avoid latch-up or overstress conditions. The NCP512SQ31T1 is not rated for automotive load-dump or transient surges.
Does the NCP512SQ31T1 require an external pull-up resistor on the Enable pin?
No, the NCP512SQ31T1 does not require an external pull-up resistor on the Enable pin. When unused, the Enable pin must be connected directly to Vin to ensure the regulator remains enabled. The internal circuitry does not provide a weak pull-up; leaving Enable floating may cause erratic turn-on behavior or increased leakage. The NCP512SQ31T1 specifies VTH(HI) = 1.3 V minimum for activation, ensuring compatibility with standard 1.8 V or 3.3 V GPIO outputs.
Can the NCP512SQ31T1 operate stably with a 0.47 µF ceramic output capacitor?
No - the NCP512SQ31T1 requires a minimum 1.0 µF ceramic output capacitor for guaranteed stability across all operating conditions. The datasheet explicitly specifies 1.0 µF (X5R/X7R) as the minimum value; using 0.47 µF may result in oscillation, excessive overshoot during load transients, or failure to regulate under dynamic loads. Larger values (e.g., 2.2 µF or 4.7 µF) improve ripple rejection and load transient response without compromising stability.
What is the thermal shutdown threshold of the NCP512SQ31T1?
The NCP512SQ31T1 incorporates internal thermal shutdown that activates at approximately 160 °C junction temperature. Once triggered, the regulator disables output until junction temperature falls below the hysteresis threshold (~140 °C). This protection is independent of ambient temperature and load current, and is designed to prevent permanent damage during sustained overload or inadequate PCB copper pour. The NCP512SQ31T1's RJA is 400 °C/W in standard JEDEC layout, limiting continuous power dissipation to ~250 mW at 25 °C ambient.
Is the NCP512SQ31T1 pin-compatible with other variants in the NCP512 family?
Yes - all NCP512 variants, including NCP512SQ31T1, share identical SC-88A (SOT-353) pinout and package dimensions. Pin 1 is Vin, Pin 2 is GND, Pin 3 is Enable, Pin 4 is N/C, and Pin 5 is Vout across the entire series. This allows direct substitution between voltage options (e.g., NCP512SQ30T1G or NCP512SQ33T1G) without PCB redesign, provided the application tolerates the different output voltage and associated dropout margin.
NCP512SQ31T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-88A (SC-70-5/SOT-353)
NCP512SQ31T1 FAQ
1.How can I place an order for NCP512SQ31T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP512SQ31T1 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 NCP512SQ31T1 reliable?
The price and inventory of NCP512SQ31T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP512SQ31T1 is usually 5 days.
3.What payment methods are accepted for NCP512SQ31T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP512SQ31T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP512SQ31T1?
NCP512SQ31T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP512SQ31T1 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 NCP512SQ31T1?
For technical support, including NCP512SQ31T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP512SQ31T1 requirements.
6.How does Aetrix verify that NCP512SQ31T1 is sourced from the original manufacturer or authorized distributors?
All NCP512SQ31T1 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 NCP512SQ31T1 meets industry standards.
7.What is the process for return or replacement of NCP512SQ31T1?
All NCP512SQ31T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP512SQ31T1, 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 NCP512SQ31T1 part is unused and in its original packaging.
Return procedure for NCP512SQ31T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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