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onsemi NCP502SQ18T1
- Part No.:
- NCP502SQ18T1
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ18T1.pdf
- Description:
- IC REG LINEAR 1.8V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
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Product details
Overview
NCP502SQ18T1 from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 1.8 V at up to 80 mA, housed in SC70-5 package. It features 40 µA typical quiescent current, ±2.0% output voltage accuracy over −40 °C to +85 °C, and ultra-low dropout (850 mV at 80 mA), optimized for battery-powered handheld instruments and portable consumer electronics.
For engineers reviewing the NCP502SQ18T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.8 V fixed output, SC70-5 footprint compatibility, enable threshold logic (1.3 V high / 0.3 V low), ceramic-capacitor stability, and industrial temperature range - all critical for space-constrained, low-power embedded designs.
Technical Context
The NCP502SQ18T1 employs a PMOS pass transistor architecture enabling low dropout and near-zero ground current increase under load. Its internal circuitry integrates voltage reference, error amplifier, thermal shutdown, current limiting, and enable control logic - all operating without external compensation.
Designed for ceramic capacitor compatibility, it maintains stability with 1.0 µF input/output capacitance and exhibits 55 dB ripple rejection at 1 kHz. The enable function supports active-high control with hysteresis-free thresholds, allowing direct connection to microcontroller GPIOs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.0% over −40 °C to +85 °C - ensures stable core/bias rail for 1.8 V logic and sensors. |
| Max Output Current | 80 mA continuous - sufficient for low-power microcontrollers, RF front-ends, and sensor signal chains. |
| Quiescent Current | 40 µA typical (IQ) - extends battery life in always-on or sleep-mode applications. |
| Dropout Voltage | 850 mV at 80 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min). |
| Line Regulation | 0.4 mV/V typical - minimizes output variation across input voltage swings (e.g., battery discharge). |
| Ripple Rejection | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Thermal Protection | Internal shutdown at ~160 °C - prevents damage during sustained overload or poor PCB thermal design. |
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 input supply - accepts 3.0 V to 12 V; must be decoupled with ≥1.0 µF ceramic capacitor. |
| 2 | GND | Power ground - low-impedance return path essential for noise immunity and thermal performance. |
| 3 | Enable | Active-high digital control - pulls device ON when ≥1.3 V, OFF when ≤0.3 V; tie to Vin if unused. |
| 4 | N/C | No internal connection - no PCB trace or component required; may be left floating or grounded. |
| 5 | Vout | Regulated 1.8 V output - requires ≥1.0 µF ceramic capacitor; ESR from 0 to 5 Ω supported. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 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 aluminum electrolytics. |
| ±2.0% output accuracy | Guarantees 1.764–1.836 V output across temp/load - meets tight tolerance requirements of 1.8 V I/O and analog rails. |
| Enable with logic-level thresholds | 1.3 V turn-on / 0.3 V turn-off allows direct interfacing with 1.8 V or 3.3 V MCU GPIOs without external biasing. |
| Thermal & current protection | Auto-recovering shutdown prevents latch-up during short-circuit or thermal overload - improves system reliability. |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
|
Use Scenario: Powering optical heart-rate sensor ASIC and low-power BLE transceiver in wrist-worn device. IC Role / Device Role: Primary 1.8 V supply for sensor interface and radio baseband, enabled only during measurement cycles. Use Value: 40 µA quiescent current minimizes standby drain; SC70-5 footprint saves board area in constrained wearable form factor. |
Use Scenario: Regulating power to accelerometer, gyroscope, and microcontroller core in coin-cell–powered tracker. IC Role / Device Role: Fixed 1.8 V LDO supplying digital logic and MEMS sensor interfaces with tight voltage tolerance. Use Value: ±2.0% output accuracy ensures reliable ADC reference and digital timing; ceramic cap compatibility reduces BOM cost. |
| Handheld Test Instruments | Low-Power Industrial Controllers |
|
Use Scenario: Providing clean 1.8 V rail for precision ADC front-end and display driver in battery-operated multimeter. IC Role / Device Role: Low-noise, low-dropout regulator isolating sensitive analog circuitry from noisy digital supplies. Use Value: 180 µVrms output noise and 55 dB ripple rejection preserve signal integrity in sub-mV measurement ranges. |
Use Scenario: Powering RS-485 transceiver and microcontroller I/O in remote sensor node powered by 3.6 V lithium thionyl chloride cell. IC Role / Device Role: Efficient 1.8 V conversion from declining battery voltage (3.6 V → 2.8 V), maintaining regulation until EOL. Use Value: 850 mV dropout at 80 mA enables >90% usable battery capacity; −40 °C to +85 °C rating supports outdoor deployment. |
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 | Same 1.8 V output, 250 mA rating, but higher 1.6 µA IQ; SOT-23-3 (3-pin, no enable) | Lacks enable pin and thermal shutdown; suitable only for always-on, non-critical loads. | Select if ultra-low IQ dominates and enable/control is unnecessary. |
| TPS7A0518PDBVR | 1.8 V, 200 mA, 25 µA IQ, SOT-23-5 with enable; lower dropout (175 mV @ 100 mA) | Higher current capability and better thermal performance, but larger footprint and higher cost. | Select when >80 mA load or <200 mV dropout is required, and board space permits SOT-23-5. |
Compared with MCP1700T-1802E/TT, NCP502SQ18T1 adds enable control and thermal protection at modest IQ penalty; versus TPS7A0518PDBVR, it trades current headroom and lower dropout for smaller SC70-5 size and proven field reliability in portable instrumentation.
Availability
NCP502SQ18T1 is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, handheld test instruments, and low-power industrial controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NCP502SQ18T1 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT markets.
The NCP502 series belongs to onsemi's precision linear regulator product line, engineered specifically for ultra-low-power, space-constrained battery-operated devices where quiescent current, small footprint, and ceramic capacitor compatibility are primary design constraints.
FAQ
What is the maximum input voltage rating for the NCP502SQ18T1?
The NCP502SQ18T1 supports an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent damage. For reliable 1.8 V regulation, Vin must exceed Vout by at least the dropout voltage - minimum recommended Vin is 2.65 V (1.8 V + 850 mV) at 80 mA load.
Does the NCP502SQ18T1 require external capacitors, and what values are recommended?
Yes, the NCP502SQ18T1 requires both input (Cin) and output (Cout) capacitors for stability and transient response. The datasheet specifies 1.0 µF ceramic capacitors for both positions, with no minimum ESR requirement. Larger values (e.g., 2.2–10 µF) improve load transient suppression and noise rejection, especially in high-dynamic applications like sensor sampling bursts.
Is the NCP502SQ18T1 pin-compatible with other variants in the NCP502 family?
Yes - all SC70-5 packaged NCP502 variants (e.g., NCP502SQ25T1, NCP502SQ33T1) share identical pinout, package dimensions, and thermal characteristics. Only the output voltage and marking code differ. This enables voltage-scaling flexibility within the same PCB layout, provided input voltage and load requirements remain compatible.
What is the thermal resistance (RJA) of the NCP502SQ18T1 in its SC70-5 package?
The NCP502SQ18T1 in SC70-5 (Case 419A) has a junction-to-ambient thermal resistance (RJA) of 400 °C/W under standard test conditions (single component on 80 × 80 mm FR4 PCB with 1 oz copper). This value assumes minimal copper pour; adding thermal vias and extended GND pads can reduce RJA by 30–50%, improving power handling capability.
Can the NCP502SQ18T1 be used in automotive applications?
The NCP502SQ18T1 is rated for industrial temperature range (−40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive use, the pin-compatible NCV502SN18T1G (TSOP-5, −40 °C to +125 °C, AEC-Q100 Grade 3) is the qualified alternative. Using NCP502SQ18T1 in automotive environments voids warranty and risks thermal failure outside its specified ambient range.
NCP502SQ18T1 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)
NCP502SQ18T1 FAQ
1.How can I place an order for NCP502SQ18T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ18T1 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 NCP502SQ18T1 reliable?
The price and inventory of NCP502SQ18T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ18T1 is usually 5 days.
3.What payment methods are accepted for NCP502SQ18T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ18T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ18T1?
NCP502SQ18T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ18T1 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 NCP502SQ18T1?
For technical support, including NCP502SQ18T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ18T1 requirements.
6.How does Aetrix verify that NCP502SQ18T1 is sourced from the original manufacturer or authorized distributors?
All NCP502SQ18T1 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 NCP502SQ18T1 meets industry standards.
7.What is the process for return or replacement of NCP502SQ18T1?
All NCP502SQ18T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ18T1, 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 NCP502SQ18T1 part is unused and in its original packaging.
Return procedure for NCP502SQ18T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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