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onsemi NCP512SQ31T2G
- Part No.:
- NCP512SQ31T2G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP512SQ31T2G.pdf
- Description:
- IC REG LINEAR 3.1V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:2,193
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Product details
Overview
NCP512SQ31T2G 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 supply regulation.
For engineers reviewing the NCP512SQ31T2G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low IQ operation, SC-88A (SOT-353) package compatibility, enable-controlled standby mode, and ceramic-capacitor stability in space-constrained handheld systems.
Technical Context
The NCP512SQ31T2G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/current-limit protection circuits. It operates with input voltages from 0 V to 6.0 V and maintains regulation across −40 °C to +85 °C ambient temperature.
Its enable pin provides logic-level control (VTH(HI) = 1.3 V, VTH(LO) = 0.3 V), and it achieves 50 dB ripple rejection at 1 kHz while supporting 1.0 µF ceramic input/output capacitors without ESR constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1 V ±2.0% - tightly regulated rail for microcontroller I/O or sensor biasing in portable devices. |
| Quiescent Current | 40 µA typical - enables multi-year battery life in always-on IoT sensors or standby subsystems. |
| Dropout Voltage | 170 mV at 80 mA - allows operation from depleting single-cell Li-ion or alkaline sources down to ~3.27 V. |
| Input Voltage Range | 0 V to 6.0 V - compatible with common battery chemistries and unregulated DC-DC outputs. |
| Enable Threshold | Logic-high ≥1.3 V, logic-low ≤0.3 V - supports direct interfacing with 1.8 V/3.3 V GPIO without level-shifting. |
| Thermal Protection | Internal shutdown at ~160 °C - prevents damage during transient overloads or poor PCB thermal design. |
| Noise Performance | 180 µVRMS (100 Hz–100 kHz) - suitable for noise-sensitive analog signal chains and RF front-ends. |
Pinout & Package
Package: SC-88A (SOT-353), 5-pin surface-mount, Pb-free, micro-miniature footprint (2.1 mm × 1.25 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply - must be decoupled with ≥1.0 µF ceramic capacitor placed adjacent to pin. |
| 2 | GND | Power ground reference - requires low-impedance PCB pour to minimize noise coupling and thermal resistance. |
| 3 | Enable | Active-high digital control - pulls device into <1 µA standby when driven low; tie to Vin if unused. |
| 4 | N/C | No internal connection - left floating; no PCB trace or pad 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 - reduces battery drain in sleep modes without compromising wake-up response. |
| Ceramic-capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or high-ESR capacitors. |
| Low dropout architecture | 170 mV at full 80 mA load - extends usable battery voltage range and improves efficiency vs. older LDOs. |
| Integrated protection | Current limit, thermal shutdown, and reverse-voltage safe - reduces external component count and BOM cost. |
| Pb-free SC-88A package | RoHS-compliant 5-pin SOT-353 - supports automated assembly and meets global environmental compliance mandates. |
Applications
| Wearable Health Monitor | Bluetooth LE Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing powered by coin-cell battery. IC Role / Device Role / Timing Role: Primary 3.1 V supply for ultra-low-power MCU and analog front-end. Use Value: 40 µA quiescent current enables >3-year battery life; 170 mV dropout sustains operation until battery reaches 3.27 V. |
Use Scenario: Compact environmental sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Regulated 3.1 V rail for BLE SoC and MEMS temperature/humidity sensors. Use Value: Enable pin synchronizes power with radio transmit bursts, cutting average system IQ by >90%. |
| Industrial Handheld Scanner | Smart Remote Control |
|
Use Scenario: Battery-operated barcode scanner with laser diode and imager ASIC. IC Role / Device Role / Timing Role: Secondary LDO supplying clean 3.1 V to image signal processor and interface logic. Use Value: 180 µVRMS noise ensures minimal interference in analog video path; 50 dB ripple rejection suppresses switching noise from main DC-DC. |
Use Scenario: IR/RF remote with motion wake-up and button-press transmission. IC Role / Device Role / Timing Role: Always-on 3.1 V supply for accelerometer and BLE controller in deep-sleep state. Use Value: ±2.0% output accuracy guarantees reliable ADC reference and crystal oscillator bias across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-IQ LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3102E/TT | 30 µA IQ, 6 V max input, same 3.1 V output, SOT-23-5 package - smaller thermal resistance but no enable pin. | Lacks active enable control; requires external MOSFET or resistor divider for shutdown. | Preferred where board space is tighter and enable functionality is unnecessary. |
| Torex XC6206P312MR-G | 1.0 µA IQ, 6 V max input, 3.1 V output, SOT-23-5 - ultra-low IQ but 300 mV dropout at 80 mA. | Higher dropout limits usable input range; not suitable for deeply discharged batteries. | Best for energy-harvesting or solar-charged systems where IQ dominates lifetime. |
Compared with MCP1700T-3102E/TT and XC6206P312MR-G, the NCP512SQ31T2G uniquely balances ultra-low IQ (40 µA), low dropout (170 mV), and integrated enable - making it optimal for battery-powered systems requiring both long runtime and dynamic power gating.
Availability
NCP512SQ31T2G is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, industrial handheld scanners, and smart remote controls requiring stable component supply with consistent lead times and RoHS-compliant packaging.
Supply support for NCP512SQ31T2G 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, and consumer markets.
The NCP512 series belongs to onsemi's ultra-low-IQ linear regulator product line, engineered specifically for extended-battery-life portable electronics where quiescent current, small footprint, and ceramic-capacitor compatibility are critical.
FAQ
What is the maximum input voltage rating for the NCP512SQ31T2G?
The NCP512SQ31T2G has an absolute maximum input voltage of 6.0 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended operating input range is 3.27 V to 6.0 V - ensuring sufficient headroom above the 3.1 V output while maintaining regulation under worst-case dropout conditions.
Does the NCP512SQ31T2G require external components to operate stably?
Yes - the NCP512SQ31T2G requires at least 1.0 µF ceramic capacitors on both input (Vin) and output (Vout) pins, placed as close as possible to the device. These capacitors ensure stability, improve transient response, and reduce noise. No ESR constraints apply, enabling use of low-cost X5R/X7R MLCCs per the datasheet recommendations.
Is the NCP512SQ31T2G still in active production?
No - per onsemi's January 2026 datasheet revision (Rev. 16), the NCP512SQ31T2G is marked as discontinued. However, Aetrix Electronics maintains legacy inventory and offers lifecycle management support, including last-time-buy planning and cross-reference assistance for qualified replacements.
How does the enable pin function on the NCP512SQ31T2G?
The enable pin (Pin 3) is active-high: pulling it ≥1.3 V turns the regulator on; pulling it ≤0.3 V disables output and reduces quiescent current to <1 µA. If unused, it must be tied directly to Vin - floating the pin may cause erratic behavior or increased leakage. The pin has no internal pull-up or pull-down.
What is the thermal performance of the NCP512SQ31T2G in the SC-88A package?
In the SC-88A package, the NCP512SQ31T2G has a junction-to-ambient thermal resistance (RJA) of 400 °C/W. At 25 °C ambient and 80 mA load, power dissipation is ~13.6 mW - resulting in <6 °C junction rise. For higher loads or elevated ambient, PCB copper area and thermal vias are essential to avoid thermal shutdown activation at ~160 °C.
NCP512SQ31T2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 80mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-88A (SC-70-5/SOT-353)
NCP512SQ31T2G FAQ
1.How can I place an order for NCP512SQ31T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP512SQ31T2G 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 NCP512SQ31T2G reliable?
The price and inventory of NCP512SQ31T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP512SQ31T2G is usually 5 days.
3.What payment methods are accepted for NCP512SQ31T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP512SQ31T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP512SQ31T2G?
NCP512SQ31T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP512SQ31T2G 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 NCP512SQ31T2G?
For technical support, including NCP512SQ31T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP512SQ31T2G requirements.
6.How does Aetrix verify that NCP512SQ31T2G is sourced from the original manufacturer or authorized distributors?
All NCP512SQ31T2G 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 NCP512SQ31T2G meets industry standards.
7.What is the process for return or replacement of NCP512SQ31T2G?
All NCP512SQ31T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP512SQ31T2G, 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 NCP512SQ31T2G part is unused and in its original packaging.
Return procedure for NCP512SQ31T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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