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onsemi NCP511SN33T1
- Part No.:
- NCP511SN33T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP511SN33T1.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
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Product details
Overview
NCP511SN33T1 from onsemi is a fixed-output, CMOS low-dropout linear regulator delivering 3.3 V at up to 150 mA with ultra-low 40 µA quiescent current and 100 mV dropout at 100 mA. It integrates PMOS pass transistor, thermal shutdown, current limit, and enable control - designed for battery-powered portable electronics requiring stable low-power voltage regulation.
For engineers reviewing the NCP511SN33T1 datasheet, pinout, applications, or equivalent options, key selection criteria include output accuracy (±2.0%), TSOP-5 package compatibility, enable logic threshold (0.3 V / 1.3 V), ceramic capacitor stability (≥1.0 µF), and industrial temperature range (−40°C to +85°C).
Technical Context
The NCP511SN33T1 uses a PMOS pass transistor architecture enabling low dropout and near-zero ground current increase under load. Its internal error amplifier compares a precision voltage reference against feedback from the regulated 3.3 V output, driving the pass element to maintain regulation across line (Vin = 4.3 V to 6.0 V) and load (1 mA to 150 mA) variations.
Enable functionality is implemented as a digital input with defined logic thresholds (VTH(HI) = 1.3 V, VTH(LO) = 0.3 V); when pulled low, the device enters standby with <0.1 µA quiescent current. Thermal shutdown activates at ~160°C, and current limit is internally set to ~800 mA for 3.3 V variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.0% (1.0 mA to 150 mA, −40°C to +85°C) - ensures stable MCU core or sensor rail within tight tolerance. |
| Max Input Voltage | 6.0 V - supports single-cell Li-ion (4.2 V) or dual-cell alkaline (3.2 V) with margin for ripple. |
| Dropout Voltage | 100 mV at 100 mA - enables regulation down to Vin = 3.4 V, critical for battery end-of-life operation. |
| Quiescent Current | 40 µA typical (IOUT = 1–150 mA) - extends battery life in always-on monitoring circuits. |
| Line Regulation | 1.0 mV/V (1.5–4.4 V input range) - minimizes output drift during battery discharge or supply ripple. |
| Ripple Rejection | 50 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Thermal Shutdown | Activates at ~160°C - protects device during overload or poor PCB thermal design without external circuitry. |
Pinout & Package
The NCP511SN33T1 is housed in a 5-pin TSOP-5 surface-mount package (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply (0–6.0 V); must be decoupled with ≥1.0 µF ceramic capacitor placed adjacent to pin. |
| 2 | GND | Power ground reference; requires low-impedance connection to minimize noise coupling and ground bounce. |
| 3 | Enable | Digital control input; logic high (>1.3 V) enables regulation, logic low (<0.3 V) disables output and reduces IQ to <0.1 µA. |
| 4 | N/C | No internal connection; must remain unconnected or floating - not tied to any potential. |
| 5 | Vout | Regulated 3.3 V output; requires ≥1.0 µF output capacitor (ceramic or tantalum) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical under full 150 mA load - enables multi-year battery life in IoT sensors. |
| Low dropout voltage | 100 mV at 100 mA - sustains regulation through deep battery discharge in handheld devices. |
| High output accuracy | ±2.0% over temperature and load - eliminates need for post-regulation trimming in precision analog subsystems. |
| Stable with ceramic capacitors | Minimum 1.0 µF output capacitance - reduces BOM cost and board area vs. electrolytic/tantalum alternatives. |
| Integrated protection | Current limit (~800 mA) and thermal shutdown - prevents damage during short-circuit or thermal overload without external components. |
Applications
| Cellular Phone Power Management | Portable Medical Sensor Module |
|---|---|
Use Scenario: Regulating 3.3 V rail for baseband processor, RF transceiver, and display interface in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary low-noise, low-IQ LDO supplying critical digital logic and analog front-end circuitry. Use Value: 50 dB ripple rejection suppresses DC/DC switching noise, preserving RF signal integrity and ADC SNR. | Use Scenario: Powering ECG front-end amplifier, microcontroller, and BLE radio in wearable cardiac monitor. IC Role / Device Role / Timing Role: Standby-optimized voltage source enabling sub-µA sleep current while supporting fast wake-up via Enable pin. Use Value: 40 µA IQ extends coin-cell battery life beyond 2 years in intermittent-sampling mode. |
| Industrial Handheld Meter | Smart Home Motion Sensor Hub |
Use Scenario: Providing clean 3.3 V supply for ARM Cortex-M MCU, LCD driver, and isolated RS-485 transceiver in field-deployed energy meters. IC Role / Device Role / Timing Role: Industrial-grade LDO with −40°C to +85°C operation and thermal protection for uncontrolled ambient environments. Use Value: ±2.0% output accuracy ensures consistent ADC reference and real-time clock timing across temperature extremes. | Use Scenario: Powering PIR sensor signal chain, Zigbee SoC, and flash memory in battery-operated occupancy sensor node. IC Role / Device Role / Timing Role: Enable-controlled power gate for peripheral subsystems, reducing system-level standby current. Use Value: Logic-compatible Enable pin allows MCU GPIO to disable NCP511SN33T1 during deep sleep, cutting total system IQ to <1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 250 mA output, 1.6 µA IQ, SOT-23-5 package - lower quiescent current but higher dropout (600 mV @ 250 mA). | Better for ultra-low-power sleep modes; less suitable for high-current bursts or low-Vin battery operation. | Choose MCP1700T-3302E/MB if standby current dominates design; choose NCP511SN33T1 for better dropout and thermal robustness at 150 mA. |
| TPS70633DBVR | 200 mA output, 1.7 µA IQ, 170 mV dropout @ 150 mA, active-high enable - lower IQ but higher dropout and tighter layout constraints. | Preferred for space-limited designs needing lowest possible IQ; less tolerant of low-input-voltage brownout conditions. | Choose TPS70633DBVR for minimal IQ in compact layouts; choose NCP511SN33T1 for superior dropout performance and proven TSOP-5 thermal reliability. |
Compared with MCP1700T-3302E/MB and TPS70633DBVR, the NCP511SN33T1 offers the best balance of ultra-low dropout (100 mV), moderate quiescent current (40 µA), and industrial temperature rating - making it optimal for battery-powered systems where both runtime and voltage headroom are constrained.
Availability
NCP511SN33T1 is available at Aetrix Electronics and suitable for cellular phone power management, portable medical sensor modules, and industrial handheld meters requiring stable component supply, long-term lifecycle support, and automotive-qualified alternatives (NCV511SN33T1G).
Supply support for NCP511SN33T1 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP511 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small footprint, and robust thermal protection.
FAQ
What is the maximum input voltage rating for the NCP511SN33T1?
The NCP511SN33T1 has an absolute maximum input voltage rating of 6.0 V. Operation above this level risks permanent damage. For inputs exceeding 6.0 V, an external pre-regulator (e.g., resistive divider or additional LDO) must be used - as documented in Figure 22 of the official datasheet. The NCP511SN33T1 itself must never be exposed to >6.0 V on its Vin pin.
Does the NCP511SN33T1 require an external pull-up on the Enable pin?
No, the NCP511SN33T1 does not require an external pull-up on the Enable pin. If unused, the Enable pin must be connected directly to Vin to ensure the device remains enabled. Leaving Enable floating may cause erratic behavior due to noise susceptibility. The internal logic thresholds (0.3 V low, 1.3 V high) are designed for direct MCU GPIO interfacing without external biasing.
Can the NCP511SN33T1 operate stably with a 0.47 µF ceramic output capacitor?
No - the NCP511SN33T1 requires a minimum output capacitance of 1.0 µF for guaranteed stability, as specified in the datasheet. Using 0.47 µF may result in oscillation or degraded transient response, especially under load steps. Ceramic capacitors ≥1.0 µF (X5R/X7R, ≤3.0 Ω ESR) are fully supported and recommended for optimal noise and load regulation performance.
What is the thermal shutdown threshold temperature for the NCP511SN33T1?
The NCP511SN33T1 features internal thermal shutdown that activates at approximately 160°C junction temperature, as stated in the "Thermal Protection" section of the datasheet. Once triggered, the device disables output until junction temperature falls below the hysteresis threshold (~140°C). This protection operates independently of load or input conditions and requires no external components.
Is the NCP511SN33T1 pin-compatible with other NCP511 variants like NCP511SN30T1?
Yes - all NCP511 variants (e.g., NCP511SN30T1, NCP511SN28T1, NCP511SN33T1) share identical TSOP-5 pinout, package dimensions, and electrical interface. Only the nominal output voltage differs. This allows drop-in replacement across voltage options without PCB redesign, provided the application can tolerate the specific output voltage and associated load regulation behavior.
NCP511SN33T1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 100mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- 100 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:
- 5-TSOP
NCP511SN33T1 FAQ
1.How can I place an order for NCP511SN33T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP511SN33T1 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 NCP511SN33T1 reliable?
The price and inventory of NCP511SN33T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP511SN33T1 is usually 5 days.
3.What payment methods are accepted for NCP511SN33T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP511SN33T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP511SN33T1?
NCP511SN33T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP511SN33T1 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 NCP511SN33T1?
For technical support, including NCP511SN33T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP511SN33T1 requirements.
6.How does Aetrix verify that NCP511SN33T1 is sourced from the original manufacturer or authorized distributors?
All NCP511SN33T1 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 NCP511SN33T1 meets industry standards.
7.What is the process for return or replacement of NCP511SN33T1?
All NCP511SN33T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP511SN33T1, 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 NCP511SN33T1 part is unused and in its original packaging.
Return procedure for NCP511SN33T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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