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onsemi NCP502SQ18T1G
- Part No.:
- NCP502SQ18T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ18T1G.pdf
- Description:
- IC REG LINEAR 1.8V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:4,115
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Product details
Overview
NCP502SQ18T1G 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, ultra-low dropout (850 mV at 80 mA), and ±2.0% output voltage accuracy - designed for battery-powered handheld instruments and portable consumer electronics requiring stable low-voltage supply.
For engineers reviewing the NCP502SQ18T1G datasheet, pinout, applications, or equivalent options, key selection criteria include enable threshold compatibility (1.3 V high / 0.3 V low), SC70-5 thermal resistance (400 °C/W), ceramic capacitor stability, and industrial temperature range (−40 °C to +85 °C).
Technical Context
The NCP502SQ18T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuits (current limit, thermal shutdown) in a single die. Its architecture enables stable regulation with low ESR ceramic capacitors and eliminates need for external compensation.
It operates with input voltages from 3.0 V to 12 V, supports enable-controlled standby mode, and maintains regulation down to 1.8 V output with minimal headroom - making it suitable for Li-ion–fed systems where input voltage may dip near nominal output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2.0% - ensures stable core or I/O rail for low-power microcontrollers and sensors. |
| Max Output Current | 80 mA - sufficient for MCU peripherals, RF modules, or small displays without thermal derating in SC70-5. |
| Quiescent Current | 40 µA typical - extends battery life in always-on or sleep-mode applications like remote sensors. |
| Dropout Voltage | 850 mV at 80 mA - allows operation with input as low as 2.65 V while maintaining 1.8 V output. |
| Line Regulation | 0.4 mV/V - minimizes output variation across wide input swings (e.g., 3.3 V to 12 V battery decay). |
| Thermal Range | −40 °C to +85 °C - certified for industrial-grade portable equipment deployment. |
| Ripple Rejection | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
Pinout & Package
The NCP502SQ18T1G is housed in the SC70-5 (Case 419A) surface-mount package - a 2.0 mm × 1.25 mm × 0.95 mm micro-miniature outline optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 3.0 V to 12 V unregulated input; requires local 1.0 µF ceramic decoupling. |
| 2 - GND | Power ground reference | Must be low-impedance connection to PCB ground plane to ensure stability and noise immunity. |
| 3 - Enable | Active-high enable control | Pull ≥1.3 V to activate regulator; pull ≤0.3 V to disable (IQ drops to 0.1 µA). |
| 4 - N/C | No internal connection | Not bonded; PCB trace may be omitted or left floating - no electrical function. |
| 5 - Vout | Regulated 1.8 V output | Delivers clean, low-noise 1.8 V to load; requires 1.0 µF ceramic output capacitor for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - enables >1-year battery life in 10 µA average-load IoT endpoints. |
| Ceramic capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or high-ESR caps. |
| Enable logic with defined thresholds | 1.3 V turn-on / 0.3 V turn-off - interfaces directly with 1.8 V or 3.3 V GPIO without level-shifting. |
| Integrated protection | Current limiting and thermal shutdown - prevents damage during short-circuit or overload events. |
| Pb-free SC70-5 package | RoHS-compliant, micro-miniature footprint - supports high-density layout in wearables and hearing aids. |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) sensor node powered by coin cell. IC Role / Device Role / Timing Role: Primary 1.8 V supply for ultra-low-power ADC, BLE radio, and microcontroller core. Use Value: 40 µA quiescent current extends 3V CR2032 battery life beyond 18 months in sleep-dominated operation. | Use Scenario: Heart-rate monitoring wristband with optical PPG sensor and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Clean 1.8 V rail for sensor analog front-end and digital logic domain. Use Value: 55 dB ripple rejection suppresses switching noise from companion buck converter, reducing ADC measurement error by >8 LSB. |
| Industrial Handheld Scanners | Smart Remote Controls |
Use Scenario: Rugged barcode scanner using Li-ion battery and laser driver IC. IC Role / Device Role / Timing Role: Low-dropout 1.8 V supply for FPGA configuration memory and interface logic. Use Value: 850 mV dropout enables full 80 mA output even as battery discharges from 4.2 V to 3.4 V. | Use Scenario: Voice-enabled IR/RF remote with MEMS microphone and sub-GHz transceiver. IC Role / Device Role / Timing Role: Always-on 1.8 V bias for wake-on-voice circuitry and real-time clock. Use Value: Enable pin allows system-level power gating - reduces standby current to <0.1 µA when not in use. |
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-1802E/MB | 2.5 µA IQ, 250 mA output, SOT-23-3 (no enable) | Lacks enable pin and thermal shutdown; higher max current but larger dropout (600 mV @ 250 mA) | Choose when ultra-low IQ dominates and enable control is unnecessary. |
| Torex XC6206P182MR-G | 1 µA IQ, 250 mA, SOT-23-5 (enable), 1.2 V min input | Lower dropout (300 mV @ 100 mA) but only 1.2 V min input - incompatible with 12 V input systems. | Prefer for coin-cell or single-cell LiFePO4 systems where input never exceeds 3.6 V. |
Compared with MCP1700T-1802E/MB and XC6206P182MR-G, the NCP502SQ18T1G uniquely balances ultra-low IQ, enable functionality, thermal protection, and 12 V input tolerance - making it optimal for multi-battery or wide-input portable designs where reliability and feature completeness matter more than absolute minimum quiescent current.
Availability
NCP502SQ18T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart remote controls requiring stable component supply with long-lifecycle support.
Supply support for NCP502SQ18T1G 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 focused on energy-efficient electronics, with leadership in automotive, industrial, cloud, and medical applications.
The NCP502 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for battery-powered portable equipment demanding low quiescent current, small footprint, and robust protection - not general-purpose power management.
FAQ
What is the maximum input voltage rating for the NCP502SQ18T1G?
The NCP502SQ18T1G 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 performance, design inputs to remain ≤12 V under all conditions including transients - especially critical in automotive or industrial environments where load-dump spikes may occur.
Does the NCP502SQ18T1G require an external output capacitor, and what type is recommended?
Yes, the NCP502SQ18T1G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed close to the Vout and GND pins. This capacitor ensures stability, improves load transient response, and reduces output noise. TDK part numbers C2012X5R1C105K or C1608X5R1A105K are validated per the datasheet. Tantalum capacitors are also acceptable but offer no advantage over low-ESR ceramics.
Can the NCP502SQ18T1G be used with a 2.5 V input supply?
No - the NCP502SQ18T1G cannot regulate properly from a 2.5 V input. With a 1.8 V output and minimum dropout of 850 mV (at 80 mA), the minimum required input is 2.65 V. At 2.5 V input, the device enters dropout and output collapses below specification. For 2.5 V input systems, consider a lower-dropout LDO such as the XC6206P182MR-G (300 mV dropout) or verify operation at reduced load current using Figure 10 in the datasheet.
What is the enable pin behavior when left unconnected on the NCP502SQ18T1G?
The enable pin must not be left floating. If unused, the NCP502SQ18T1G datasheet explicitly requires connecting the Enable pin (Pin 3) to Vin to guarantee proper operation. An unconnected enable pin may cause erratic startup, oscillation, or failure to regulate due to noise coupling - especially in high-EMI environments. Pull-up to Vin is the only recommended default configuration.
Is the NCP502SQ18T1G still in active production, and what is its lifecycle status?
Yes, the NCP502SQ18T1G remains active and available through authorized distributors including Aetrix Electronics. Although several NCP502 variants (e.g., SQxxT2G suffix) were marked discontinued in Revision 23 (April 2026), the SQ18T1G variant is not listed among them and continues to be manufactured and supported by onsemi with full documentation and long-term supply commitment.
NCP502SQ18T1G 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)
NCP502SQ18T1G FAQ
1.How can I place an order for NCP502SQ18T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ18T1G 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 NCP502SQ18T1G reliable?
The price and inventory of NCP502SQ18T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ18T1G is usually 5 days.
3.What payment methods are accepted for NCP502SQ18T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ18T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ18T1G?
NCP502SQ18T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ18T1G 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 NCP502SQ18T1G?
For technical support, including NCP502SQ18T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ18T1G requirements.
6.How does Aetrix verify that NCP502SQ18T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ18T1G 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 NCP502SQ18T1G meets industry standards.
7.What is the process for return or replacement of NCP502SQ18T1G?
All NCP502SQ18T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ18T1G, 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 NCP502SQ18T1G part is unused and in its original packaging.
Return procedure for NCP502SQ18T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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