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onsemi NCP511SN18T1
- Part No.:
- NCP511SN18T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP511SN18T1.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,838
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Product details
Overview
NCP511SN18T1 from onsemi is a fixed-output, CMOS-based low-dropout linear regulator delivering 1.8 V at up to 150 mA with ultra-low quiescent current (40 µA typical), 100 mV dropout at 100 mA, and ±2.0% output voltage accuracy - designed for battery-powered portable instrumentation requiring stable low-power voltage regulation.
For engineers reviewing the NCP511SN18T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance under light load, enable threshold compatibility with 1.8 V logic, thermal shutdown behavior in compact layouts, and ceramic capacitor stability with ≥1.0 µF output capacitance.
Technical Context
The NCP511SN18T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit and thermal shutdown) in a single TSOP-5 package. Its enable input supports active-high logic control with 1.3 V turn-on threshold and 0.3 V turn-off threshold.
It operates across an input voltage range of 0–6.0 V and maintains regulation over −40°C to +85°C ambient temperature. Output stability is guaranteed with ≥1.0 µF ceramic output capacitor and no ESR requirement, enabling low-noise operation (110 µVRMS) and 50 dB ripple rejection at 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% (ensures reliable biasing of 1.8 V digital cores and I/O without external trimming) |
| Max Output Current | 150 mA (supports moderate-power microcontrollers, sensors, and RF front-ends) |
| Dropout Voltage | 100 mV at 100 mA (enables operation down to Vin = 1.9 V, extending battery runtime) |
| Quiescent Current | 40 µA typical (minimizes standby power loss in always-on monitoring circuits) |
| Enable Threshold | 1.3 V (logic-high) / 0.3 V (logic-low) - compatible with 1.8 V GPIO without level-shifting |
| Thermal Shutdown | Activates at ~160°C junction temperature (prevents permanent damage during sustained overload or poor PCB thermal design) |
| Operating Temp | −40°C to +85°C (meets industrial-grade requirements for handheld test equipment and field-deployed instruments) |
Pinout & Package
The NCP511SN18T1 is housed in a Pb-free 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 rail - must be decoupled with ≥1.0 µF ceramic capacitor placed adjacent to pin |
| 2 | GND | Power ground reference - requires low-impedance PCB trace to minimize noise coupling and ground bounce |
| 3 | Enable | Active-high digital control input - pulled high to Vin for always-on operation; driven low to disable regulator and reduce IQ to ≤0.1 µA |
| 4 | N/C | No internal connection - must remain unconnected; floating or tied to GND/Vin has no functional effect |
| 5 | Vout | Regulated 1.8 V output - requires ≥1.0 µF ceramic capacitor; ESR from 0 to 3 Ω supported for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical enables >1-year battery life in low-duty-cycle sensor nodes powered by coin cells |
| Low-ESR ceramic capacitor support | No minimum ESR requirement allows use of small, low-cost 0402/0603 X5R/X7R MLCCs without stability risk |
| Integrated thermal shutdown | Auto-recovery behavior after cooldown prevents latch-up in thermally constrained enclosures |
| High line/load regulation | Line regulation ≤3.5 mV/V and load regulation ≤0.8 mV/mA ensure stable 1.8 V supply across varying battery voltage and load transients |
| Pb-free TSOP-5 package | RoHS-compliant footprint with 0.95 mm pitch simplifies automated assembly and meets global environmental compliance mandates |
Applications
| Portable Medical Sensors | Industrial Handheld Testers |
|---|---|
|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE interface operating 24/7 on CR2032 cell. IC Role / Device Role / Timing Role: Primary 1.8 V LDO supplying MCU core, analog front-end, and BLE radio subsystem. Use Value: 40 µA quiescent current extends operational life beyond 18 months; 100 mV dropout preserves regulation as battery discharges from 3.0 V to 1.9 V. |
Use Scenario: Ruggedized multimeter with LCD display, isolated serial interface, and rechargeable Li-ion pack. IC Role / Device Role / Timing Role: Secondary 1.8 V regulator for precision ADC reference and digital logic rails, isolated from noisy main 3.3 V domain. Use Value: ±2.0% output accuracy ensures consistent measurement resolution; thermal shutdown protects against overheating during extended continuity testing. |
| Wireless Sensor Nodes | Low-Power IoT Edge Controllers |
|
Use Scenario: Sub-GHz environmental node (temperature/humidity/pressure) transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Standby-mode LDO enabling wake-up circuitry and sensor biasing while MCU sleeps. Use Value: Enable pin allows full system shutdown (IQ ≤0.1 µA) between transmissions; 1.0 µF ceramic output cap minimizes board area and cost. |
Use Scenario: DIN-rail mounted edge controller managing Modbus RTU field devices with local data logging. IC Role / Device Role / Timing Role: Dedicated 1.8 V supply for FPGA configuration memory and low-voltage I/O banks. Use Value: −40°C to +85°C rating ensures reliability in unconditioned industrial cabinets; 50 dB ripple rejection suppresses switching noise from adjacent DC-DC converters. |
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-1802E/TT | 2.5 µA IQ (lower), 6 V max Vin, SOT-23-5 package, 170 mV dropout at 250 mA | Better for ultra-long-life coin-cell apps; higher dropout limits usable input range in Li-ion systems | Choose MCP1700T-1802E/TT when <5 µA standby current is mandatory and thermal margin permits higher dropout |
| TLS850B2TEV50 | Automotive-qualified (AEC-Q100 Grade 1), 35 µA IQ, integrated watchdog, 42 V load dump tolerance | Designed for automotive body electronics; includes fail-safe diagnostics not present in NCP511SN18T1 | Choose TLS850B2TEV50 only for automotive environments requiring ASIL-B compliance and system-level safety features |
Compared with MCP1700T-1802E/TT and TLS850B2TEV50, the NCP511SN18T1 offers balanced performance for industrial portable gear: lower cost than automotive variants, higher current capability than ultra-low-IQ alternatives, and proven ceramic-capacitor stability without external compensation.
Availability
NCP511SN18T1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld testers, wireless sensor nodes, and low-power IoT edge controllers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP511SN18T1 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, and cloud infrastructure markets.
The NCP511 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-operated portable electronics where ultra-low quiescent current, small footprint, and ceramic-capacitor compatibility are critical design constraints.
FAQ
What is the maximum input voltage rating for the NCP511SN18T1?
The NCP511SN18T1 has an absolute maximum input voltage of 6.0 V. Exceeding this rating risks permanent damage. For applications with higher source voltages (e.g., 12 V battery rails), an external pre-regulator stage is required - as documented in Figure 22 of the datasheet - to ensure Vin remains within specification while maintaining thermal safety margins for the NCP511SN18T1.
Does the NCP511SN18T1 require an external pull-up resistor on the Enable pin?
No, the NCP511SN18T1 does not require an external pull-up on the Enable pin. When unused, the Enable pin must be directly connected to Vin to guarantee reliable turn-on. Pulling Enable to GND disables the regulator and reduces quiescent current to ≤0.1 µA. Floating the Enable pin is prohibited and may cause unpredictable output behavior or increased leakage.
Can the NCP511SN18T1 operate stably with a 0.47 µF ceramic output capacitor?
No - the NCP511SN18T1 requires a minimum output capacitance of 1.0 µF for guaranteed stability per the datasheet. Using 0.47 µF violates the specified condition and may result in oscillation, excessive output ripple, or failure to regulate under load transients. The device supports ceramic capacitors with ESR from 0 to 3 Ω, but capacitance must meet or exceed 1.0 µF.
Is the NCP511SN18T1 qualified for automotive applications?
The NCP511SN18T1 is not automotive-qualified. It is rated for industrial temperature range (−40°C to +85°C) and carries no AEC-Q100 certification. For automotive use, the pin-compatible NCV511SN18T1G variant - explicitly marked with "NCV" prefix and PPAP-capable - must be selected, as it undergoes additional qualification testing and process controls required for vehicle electronics.
What is the thermal resistance (RJA) of the NCP511SN18T1 in its TSOP-5 package?
The NCP511SN18T1 in TSOP-5 package has a typical junction-to-ambient thermal resistance (RJA) of 250°C/W under standard JEDEC test conditions (single-layer copper, 1 in² pad). Actual RJA depends heavily on PCB layout: adding thermal vias to inner ground planes and increasing copper area around the GND pin can reduce RJA to ~120°C/W, enabling higher continuous output current before thermal shutdown activates.
NCP511SN18T1 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):
- 1.8V
- 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
NCP511SN18T1 FAQ
1.How can I place an order for NCP511SN18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP511SN18T1 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 NCP511SN18T1 reliable?
The price and inventory of NCP511SN18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP511SN18T1 is usually 5 days.
3.What payment methods are accepted for NCP511SN18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP511SN18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP511SN18T1?
NCP511SN18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP511SN18T1 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 NCP511SN18T1?
For technical support, including NCP511SN18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP511SN18T1 requirements.
6.How does Aetrix verify that NCP511SN18T1 is sourced from the original manufacturer or authorized distributors?
All NCP511SN18T1 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 NCP511SN18T1 meets industry standards.
7.What is the process for return or replacement of NCP511SN18T1?
All NCP511SN18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP511SN18T1, 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 NCP511SN18T1 part is unused and in its original packaging.
Return procedure for NCP511SN18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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