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onsemi NCP500SN18T1
- Part No.:
- NCP500SN18T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP500SN18T1.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,565
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Product details
Overview
NCP500SN18T1 from onsemi is a fixed-output, low-noise, low-dropout linear regulator delivering 1.8 V at up to 150 mA. It features an ultra-low dropout voltage of 170 mV at full load, 2.5% output accuracy, and operates from 1.8 V to 6.0 V input. Designed for noise-sensitive portable applications, it eliminates the need for an external bypass capacitor while maintaining 50 µVRMS output noise (10 Hz–100 kHz).
For engineers reviewing the NCP500SN18T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 150 mA, enable threshold compatibility with 1.0 V logic, thermal shutdown behavior, RMS noise without bypass, and DFN 2×2.2 mm footprint constraints.
Technical Context
The NCP500SN18T1 uses a PMOS pass transistor architecture enabling ultra-low dropout and fast 20 µs enable turn-on time. Its internal voltage reference, error amplifier, and protection circuits (current limit and thermal shutdown) are integrated into a single die optimized for battery-powered systems.
It achieves stable regulation with only 1.0 µF ceramic output capacitance and requires no minimum ESR. The enable input accepts logic-level control down to 0.9 V high threshold and draws only 3.0 nA bias current, supporting low-power system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.5% (1.755–1.845 V over −40°C to +85°C, 1–150 mA load) |
| Max Input Voltage | 6.0 V absolute maximum; for 1.8 V output, max practical Vin = 4.4 V (per datasheet thermal limit at 150 mA) |
| Dropout Voltage | 170 mV typical at 150 mA (measured at Vout −2.0%), enabling single-cell Li-ion operation |
| Noise Performance | 50 µVRMS (10 Hz–100 kHz), no external bypass capacitor required |
| Enable Threshold | 0.9 V logic-high turn-on; 0.15 V logic-low turn-off - compatible with 1.0 V core logic |
| Quiescent Current | 175 µA typical at 150 mA load; 0.01 µA in shutdown (Enable = 0 V) |
| Ripple Rejection | 62 dB at 1 kHz (Vin = Vout + 1.0 V + 0.5 Vpp, IOUT = 60 mA) |
Pinout & Package
Package: DFN 2×2.2 mm (Case 506BA), 6-pin, exposed thermal pad. Pin 6 is GND and shares thermal function with Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive power supply input; supports 1.8–6.0 V; must be decoupled with ≥1.0 µF ceramic capacitor |
| 2 | GND | Power ground; primary return path; connects to exposed thermal pad for heat dissipation |
| 3 | Enable | Active-high digital control; drives device ON when ≥0.9 V; connect to Vin if unused |
| 4 | Vout | Regulated 1.8 V output; requires ≥1.0 µF ceramic output capacitor for stability |
| 6 | GND | Secondary ground terminal; electrically tied to Pin 2 and thermal pad; improves thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 170 mV at 150 mA enables operation from single Li-ion (3.0–4.4 V input range) |
| No-bypass noise reduction | 50 µVRMS noise without external capacitor simplifies layout and reduces BOM count |
| Fast enable response | 20 µs turn-on time supports dynamic power sequencing in multi-rail systems |
| Low-voltage enable interface | 0.9 V logic-high threshold allows direct interfacing with 1.0 V FPGA/ASIC I/O banks |
| Thermal & current protection | Internal shutdown at ~160°C and current limiting prevent damage during overload or poor heatsinking |
Applications
| RF Power Amplifier Biasing | VCO Supply Regulation |
|---|---|
Use Scenario: Providing clean, stable bias to GaAs or SiGe RF PAs in cellular handsets and IoT transceivers. IC Role / Device Role / Timing Role: Low-noise LDO supplying 1.8 V bias rail; replaces switching converter post-regulation to suppress switching noise. Use Value: 50 µVRMS noise prevents phase noise degradation in adjacent RF stages; 170 mV dropout extends battery runtime. | Use Scenario: Powering voltage-controlled oscillators in PLL synthesizers for wireless baseband and clock generation. IC Role / Device Role / Timing Role: Ultra-stable 1.8 V supply isolating VCO core from noisy digital domains. Use Value: 2.5% output accuracy and <10 mV line/load regulation minimize frequency drift; no-bypass design avoids startup delay. |
| Portable Medical Sensors | CMOS Image Sensor Core Supply |
Use Scenario: Powering low-power analog front-ends in handheld ECG or pulse oximetry devices. IC Role / Device Role / Timing Role: Primary 1.8 V supply for precision ADCs and op-amps; enabled synchronously with MCU wake-up. Use Value: 0.01 µA shutdown current extends shelf life; 175 µA quiescent current minimizes standby drain. | Use Scenario: Delivering regulated 1.8 V to image sensor pixel arrays and column ADCs in smartphone cameras. IC Role / Device Role / Timing Role: Dedicated low-noise core rail decoupled from noisy I/O and interface supplies. Use Value: 62 dB ripple rejection suppresses digital switching artifacts; DFN 2×2.2 mm footprint fits tight camera module layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 250 mV dropout at 250 mA; 1.8 V ±2%; 1.6 µA quiescent current; SOT-23-5 package | Larger dropout limits use with lower-input batteries; lower IQ benefits ultra-low-power sleep modes | Select when lowest possible quiescent current is critical and 250 mV dropout is acceptable |
| TLC7701QD | 300 mV dropout at 150 mA; 1.8 V ±1.5%; 12 µA IQ; SOIC-8 package; includes reset output | Higher dropout and larger SOIC-8 footprint; reset function adds system monitoring capability | Select when system-level power-on reset signaling is required and board space permits SOIC-8 |
Compared with MCP1700T-1802E/TT and TLC7701QD, the NCP500SN18T1 delivers superior dropout performance (170 mV vs. ≥250 mV) and smaller DFN footprint, making it optimal for space-constrained, single-cell Li-ion designs where noise and efficiency are prioritized over ultra-low IQ or reset functionality.
Availability
NCP500SN18T1 is available at Aetrix Electronics and suitable for portable medical instrumentation, RF front-end modules, CMOS image sensor subsystems, and battery-powered industrial sensors requiring stable component supply and long-term lifecycle support.
Supply support for NCP500SN18T1 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP500 series is designed specifically for portable battery-powered systems demanding ultra-low noise, fast enable response, and minimal external components - targeting noise-sensitive analog and RF signal chains.
FAQ
What is the maximum input voltage for NCP500SN18T1 in continuous operation?
The NCP500SN18T1 has an absolute maximum input voltage rating of 6.0 V. However, for reliable continuous operation at 150 mA output, the datasheet specifies a practical maximum of 4.4 V - determined by thermal limits (TJ ≤ 125°C) given its 225°C/W junction-to-ambient thermal resistance in the DFN package. Exceeding 4.4 V at full load risks thermal shutdown.
Does NCP500SN18T1 require an external noise bypass capacitor?
No, the NCP500SN18T1 does not require an external noise bypass capacitor. Its internal low-noise architecture achieves 50 µVRMS output noise (10 Hz–100 kHz) without one - a key differentiator from conventional LDOs. This eliminates associated BOM cost, PCB area, and potential startup delay caused by bypass capacitor charging.
What is the enable input behavior of NCP500SN18T1?
The NCP500SN18T1 enable input is active-high with a 0.9 V typical turn-on threshold and 0.15 V turn-off threshold. It draws only 3.0 nA bias current, allowing direct connection to 1.0 V logic outputs. If unused, Enable must be tied to Vin to ensure regulation; floating is not permitted.
Can NCP500SN18T1 operate with ceramic output capacitors?
Yes, the NCP500SN18T1 is fully stable with ceramic output capacitors as low as 1.0 µF and requires no minimum ESR. This eliminates the need for bulkier, higher-ESR tantalum or aluminum electrolytic capacitors - reducing size, cost, and improving transient response in compact portable designs.
What protection features are integrated into NCP500SN18T1?
The NCP500SN18T1 integrates thermal shutdown (activates at ~160°C), output current limiting (~540 mA typical short-circuit current), and reverse-voltage protection on the Enable pin. These functions operate autonomously without external components, safeguarding both the regulator and downstream circuitry during fault conditions.
NCP500SN18T1 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):
- 0.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- 62dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP500SN18T1 FAQ
1.How can I place an order for NCP500SN18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP500SN18T1 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 NCP500SN18T1 reliable?
The price and inventory of NCP500SN18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP500SN18T1 is usually 5 days.
3.What payment methods are accepted for NCP500SN18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP500SN18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP500SN18T1?
NCP500SN18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP500SN18T1 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 NCP500SN18T1?
For technical support, including NCP500SN18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP500SN18T1 requirements.
6.How does Aetrix verify that NCP500SN18T1 is sourced from the original manufacturer or authorized distributors?
All NCP500SN18T1 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 NCP500SN18T1 meets industry standards.
7.What is the process for return or replacement of NCP500SN18T1?
All NCP500SN18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP500SN18T1, 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 NCP500SN18T1 part is unused and in its original packaging.
Return procedure for NCP500SN18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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