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onsemi NCP502SQ18T2G
- Part No.:
- NCP502SQ18T2G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ18T2G.pdf
- Description:
- IC REG LINEAR 1.8V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
NCP502SQ18T2G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 1.8 V at up to 80 mA with 40 µA typical quiescent current and ±2.0% output voltage accuracy over −40 °C to +85 °C. It features PMOS pass transistor architecture, ultra-low dropout (1300 mV at 80 mA), and integrated thermal/overcurrent protection - designed for battery-powered handheld instruments and portable consumer electronics.
For engineers reviewing the NCP502SQ18T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its SC70-5 package footprint, enable threshold compatibility (1.3 V high / 0.3 V low), ceramic-capacitor stability, and industrial temperature range without requiring external compensation.
Technical Context
The NCP502SQ18T2G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuitry - enabling stable regulation with minimal headroom. Its enable input supports logic-level control with defined turn-on/turn-off thresholds, and it operates without minimum load requirements.
Designed for low-noise, low-power systems, it achieves 55 dB ripple rejection at 1 kHz and 180 µVRMS output noise (100 Hz–100 kHz), while maintaining line regulation of ≤3.0 mV/V and load regulation of ≤0.8 mV/mA - all verified across full industrial temperature range and input voltage (up to 12 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% - tightly regulated nominal rail for core logic or low-voltage microcontrollers. |
| Max Output Current | 80 mA - sufficient for sensor interfaces, RF front-ends, or small MCU subsystems. |
| Quiescent Current | 40 µA typical - enables multi-year battery life in always-on IoT endpoints. |
| Dropout Voltage | 1300 mV at 80 mA - allows operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min). |
| Input Voltage Range | Up to 12 V - supports wide-input applications including USB-powered or adapter-fed systems. |
| Thermal Protection | Internal shutdown at ~160 °C - prevents damage during sustained overload or poor PCB thermal design. |
| Ripple Rejection | 55 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial and extended commercial environments. |
Pinout & Package
Package: SC70-5 (Case 419A), 1.25 mm × 1.65 mm × 0.95 mm, Pb-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 1.8 V + dropout to 12 V; requires local 1.0 µF decoupling capacitor. |
| 2 - GND | Power ground reference | Must be low-impedance connection to system ground plane to ensure regulation stability. |
| 3 - Enable | Logic-controlled regulator enable | Pull ≥1.3 V to enable; ≤0.3 V to disable; floating not allowed - tie to Vin if unused. |
| 4 - N/C | No internal connection | Not bonded; PCB trace may be omitted or left unconnected - no electrical function. |
| 5 - Vout | Regulated output voltage | Delivers 1.8 V ±2% to load; requires 1.0 µF ceramic output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - reduces standby power loss by >90% vs. standard LDOs in sleep mode. |
| Ceramic-capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| Enable control with defined thresholds | 1.3 V turn-on / 0.3 V turn-off - ensures clean sequencing with standard GPIOs or logic gates. |
| Integrated protection | Thermal shutdown + current limiting - avoids external fault-handling circuitry in space-constrained designs. |
| Low output voltage drift | 100 ppm/°C tempco - maintains <±15 mV output shift over full −40 °C to +85 °C range. |
| High PSRR at audio frequencies | 55 dB @ 1 kHz - mitigates noise coupling from buck converters or digital clocks into analog rails. |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) using low-power ADC and BLE SoC powered from coin cell. IC Role / Device Role / Timing Role: Primary 1.8 V supply for sensor signal chain and BLE radio interface. Use Value: 40 µA quiescent current extends battery life beyond 6 months; ±2% accuracy ensures consistent ADC reference scaling. |
Use Scenario: Heart-rate monitor with optical sensor and ARM Cortex-M0+ MCU operating on rechargeable Li-poly. IC Role / Device Role / Timing Role: Regulated 1.8 V rail for MCU I/O and sensor interface logic. Use Value: SC70-5 footprint saves board area; ceramic-capacitor compatibility reduces BOM cost and improves reliability. |
| Industrial Handheld Scanners | Smart Home Remote Sensors |
|
Use Scenario: Barcode scanner with laser diode driver and imaging sensor, powered by AA batteries. IC Role / Device Role / Timing Role: Stable 1.8 V supply for image processing ASIC and communication interface. Use Value: 1300 mV dropout enables operation down to 3.1 V input - extending usable battery range by ~15%. |
Use Scenario: Zigbee-enabled temperature/humidity node using CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Always-on 1.8 V regulator for ultra-low-power MCU and sensor wake-up circuitry. Use Value: −40 °C to +85 °C rating ensures field reliability in uncontrolled indoor/outdoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 250 mA max output, 1.6 µA quiescent current, SOT-23-3 package (no enable) | Lacks enable control and thermal shutdown; higher output current but larger dropout (600 mV @ 250 mA) | Choose when ultra-low IQ dominates and enable/control sequencing is unnecessary. |
| Torex XC6206P182MR-G | 150 mA max output, 1 µA IQ, SOT-23-3, no enable, ±2% accuracy | No enable pin; lower dropout (300 mV @ 100 mA); lacks thermal protection | Select for longest battery life where enable functionality and fault protection are secondary. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP502SQ18T2G uniquely balances ultra-low IQ (40 µA), integrated enable with defined thresholds, thermal protection, and SC70-5 compactness - making it optimal for space-constrained, sequenced, and thermally demanding portable designs.
Availability
NCP502SQ18T2G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart home remote sensors requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NCP502SQ18T2G 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 NCP502 series belongs to onsemi's precision low-dropout linear regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small footprint, and robust protection features.
FAQ
What is the maximum input voltage rating for the NCP502SQ18T2G?
The NCP502SQ18T2G has an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, keep input voltage within 1.8 V + dropout (≥3.1 V) up to 12 V, with derating recommended above 85 °C ambient.
Does the NCP502SQ18T2G require an external output capacitor, and what type is recommended?
Yes, the NCP502SQ18T2G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed close to the Vout and GND pins. This ensures stability, improves load transient response, and reduces output noise - no ESR constraints apply, unlike older LDO architectures.
Can the NCP502SQ18T2G be used without connecting the Enable pin?
Yes, but only if tied directly to Vin. Leaving the Enable pin floating is not permitted per datasheet guidance. Connecting Enable to Vin ensures the regulator remains active; disconnecting it from Vin without pulling low disables the output and reduces quiescent current to <1 µA.
What is the dropout voltage of the NCP502SQ18T2G at 80 mA load and full temperature range?
The dropout voltage for the NCP502SQ18T2G is 1300 mV maximum at 80 mA load and across the full operating temperature range (−40 °C to +85 °C), measured when Vout drops 3% below nominal. At room temperature and 10 mA, it drops to ~850 mV.
Is the NCP502SQ18T2G pin-compatible with other variants in the NCP502 family?
Yes - all SC70-5 packaged NCP502 variants (e.g., NCP502SQ15T2G, NCP502SQ25T2G) share identical pinout, package dimensions, and thermal characteristics. Only the output voltage and marking code differ; no PCB redesign is needed when changing between fixed-voltage versions.
NCP502SQ18T2G 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):
- 12V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.7V @ 80mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 55dB (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)
NCP502SQ18T2G FAQ
1.How can I place an order for NCP502SQ18T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ18T2G 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 NCP502SQ18T2G reliable?
The price and inventory of NCP502SQ18T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ18T2G is usually 5 days.
3.What payment methods are accepted for NCP502SQ18T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ18T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ18T2G?
NCP502SQ18T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ18T2G 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 NCP502SQ18T2G?
For technical support, including NCP502SQ18T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ18T2G requirements.
6.How does Aetrix verify that NCP502SQ18T2G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ18T2G 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 NCP502SQ18T2G meets industry standards.
7.What is the process for return or replacement of NCP502SQ18T2G?
All NCP502SQ18T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ18T2G, 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 NCP502SQ18T2G part is unused and in its original packaging.
Return procedure for NCP502SQ18T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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