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onsemi NCP502SQ37T1G
- Part No.:
- NCP502SQ37T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ37T1G.pdf
- Description:
- IC REG LINEAR 3.7V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
NCP502SQ37T1G from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 3.7 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 uses a PMOS pass transistor, supports ceramic output capacitors down to 1.0 µF, and features enable control with 1.3 V (rising) / 0.3 V (falling) thresholds - ideal for battery-powered handheld instruments requiring stable low-power bias.
For engineers reviewing the NCP502SQ37T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 80 mA (max 850 mV), thermal shutdown protection, SC70-5 package footprint compatibility, and enable logic compatibility with 1.8 V/3.3 V microcontrollers.
Technical Context
The NCP502SQ37T1G implements a PMOS-based linear regulation architecture with internal voltage reference, error amplifier, and thermal/current limiting circuits. Its ultra-low 40 µA quiescent current enables multi-week standby in portable devices, while its 850 mV max dropout at 80 mA allows operation from single-cell Li-ion or two-cell alkaline sources.
It operates across an input range of 1.3 V above output (i.e., ≥5.0 V) up to 12 V, maintains 55 dB ripple rejection at 1 kHz, and delivers 180 µVRMS output noise (100 Hz–100 kHz). The enable function provides hard shutdown with <0.1 µA standby current when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.7 V ±2.0% (ensures stable MCU core/bias rail within tolerance across temp and load) |
| Max Output Current | 80 mA (supports low-power sensors, RF front-ends, and microcontroller peripherals) |
| Quiescent Current | 40 µA typical (enables >1-year battery life in always-on sensor nodes at 10 µA avg system draw) |
| Dropout Voltage | 850 mV max at 80 mA (allows regulation from 4.55 V input, compatible with aging alkaline or discharged Li-ion) |
| Line Regulation | 0.4 mV/V typical (minimizes output drift during battery voltage sag or supply ripple) |
| Thermal Shutdown | Activates at ~160 °C (protects against PCB overheating during sustained high-load or poor layout conditions) |
| Ripple Rejection | 55 dB at 1 kHz (suppresses switching noise from adjacent DC-DC converters) |
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 5.0–12 V unregulated input; requires local 1.0 µF decoupling capacitor |
| 2 - GND | Power ground reference | Must be low-impedance connection to PCB ground plane to ensure stability and noise immunity |
| 3 - Enable | Logic-controlled ON/OFF input | Active-high: ≥1.3 V turns on regulator; ≤0.3 V disables output and reduces IQ to <0.1 µA |
| 4 - N/C | No internal connection | Not bonded; may be left floating or tied to GND - no electrical function |
| 5 - Vout | Regulated output voltage | Delivers 3.7 V ±2% to load; requires 1.0 µF ceramic capacitor (X5R/X7R) placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical enables multi-year battery life in always-on IoT endpoints |
| Ceramic capacitor compatible | Stable with 1.0 µF X5R/X7R output cap - eliminates need for costly tantalum or high-ESR types |
| Enable threshold precision | 1.3 V (ON) / 0.3 V (OFF) thresholds ensure clean sequencing with 1.8 V and 3.3 V logic families |
| Industrial temperature range | −40 °C to +85 °C operation supports deployment in consumer and industrial ambient environments |
| Integrated protection | Current limit and thermal shutdown prevent damage during overload or poor heatsinking |
Applications
| Portable Medical Sensors | Wireless Remote Controls |
|---|---|
Use Scenario: Continuous glucose monitor using coin-cell battery and low-power BLE SoC. IC Role / Device Role / Timing Role: Provides stable 3.7 V bias to analog front-end and BLE radio transceiver. Use Value: 40 µA quiescent current extends battery life beyond 18 months; 850 mV dropout sustains regulation as battery discharges to 4.55 V. | Use Scenario: IR remote with motion wake-up and sub-10 µA sleep current. IC Role / Device Role / Timing Role: Powers microcontroller and IR LED driver only when button pressed or motion detected. Use Value: Enable pin allows full shutdown (<0.1 µA) between events; ±2% output accuracy ensures consistent LED brightness and MCU clock stability. |
| Handheld Test Meters | Smart Home Sensor Nodes |
Use Scenario: Battery-operated multimeter with LCD and precision ADC. IC Role / Device Role / Timing Role: Supplies clean 3.7 V rail to 16-bit SAR ADC and display controller. Use Value: 180 µVRMS output noise prevents measurement floor degradation; 55 dB ripple rejection isolates ADC from noisy digital sections. | Use Scenario: Zigbee temperature/humidity node powered by AA batteries. IC Role / Device Role / Timing Role: Regulates power to MCU, RF transceiver, and capacitive sensing circuitry. Use Value: SC70-5 footprint minimizes PCB area; −40 °C to +85 °C rating ensures reliability across indoor/outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3702E/TT | 3.7 V output, 250 mA max, 1.6 µA IQ, SOT-23-5 package | Lower IQ but higher dropout (1.2 V @ 250 mA); not SC70-5 footprint compatible | Select for ultra-low-power sleep modes where peak current exceeds 80 mA and board space permits SOT-23-5 |
| Torex XC6206P372MR-G | 3.7 V output, 150 mA max, 1 µA IQ, SOT-25 package (pinout differs) | Lower IQ and smaller package, but enable pin absent; requires external ON/OFF control | Select when minimal standby current dominates design priority and enable functionality is implemented externally |
Compared with MCP1700T-3702E/TT and XC6206P372MR-G, the NCP502SQ37T1G offers optimal balance of ultra-low IQ (40 µA), SC70-5 footprint, integrated enable, and proven stability with 1.0 µF ceramic output caps - making it preferred for space-constrained, battery-sensitive designs requiring simple, reliable regulation.
Availability
NCP502SQ37T1G is available at Aetrix Electronics and suitable for portable medical sensors, wireless remote controls, and handheld test meters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NCP502SQ37T1G 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, serving automotive, industrial, cloud, and IoT markets with discrete, analog, and power management solutions.
The NCP502 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-powered portable equipment demanding ultra-low quiescent current, small footprint, and robust performance across industrial temperature ranges.
FAQ
What is the maximum input voltage rating for the NCP502SQ37T1G?
The NCP502SQ37T1G has a maximum input voltage rating of 12 V, as specified in its Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, input should remain ≤12 V, and derating is recommended under high-temperature or high-power-dissipation conditions per the thermal characteristics in the datasheet.
Does the NCP502SQ37T1G require an external output capacitor, and if so, what type and value?
Yes, the NCP502SQ37T1G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed adjacent 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 explicitly recommended in the datasheet.
Is the NCP502SQ37T1G still in active production, or has it been discontinued?
The NCP502SQ37T1G remains active and available for purchase. While several SC70-5 variants (e.g., NCP502SQ37T2G) were marked discontinued in Revision 23 (April 2026), the NCP502SQ37T1G is listed in the Ordering Information table without discontinuation notation and is shipped in tape-and-reel format (3000 units).
What is the thermal resistance (RJA) of the NCP502SQ37T1G in its SC70-5 package?
The NCP502SQ37T1G in SC70-5 package has a junction-to-ambient thermal resistance (RJA) of 400 °C/W under standard test conditions (single component on 80 × 80 × 15 mm FR4 PCB with 1 oz copper and 100 mm² copper spread area). This value must be used to calculate maximum allowable power dissipation at a given ambient temperature.
Can the NCP502SQ37T1G be used without connecting the Enable pin?
Yes - if the Enable pin is unused, the datasheet specifies it must be connected directly to Vin to ensure the regulator remains enabled. Leaving it floating is not permitted, as it may cause erratic turn-on/turn-off behavior due to noise susceptibility. Pull-up to Vin guarantees deterministic operation and avoids unintended shutdown.
NCP502SQ37T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 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)
NCP502SQ37T1G FAQ
1.How can I place an order for NCP502SQ37T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ37T1G 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 NCP502SQ37T1G reliable?
The price and inventory of NCP502SQ37T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ37T1G is usually 5 days.
3.What payment methods are accepted for NCP502SQ37T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ37T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ37T1G?
NCP502SQ37T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ37T1G 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 NCP502SQ37T1G?
For technical support, including NCP502SQ37T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ37T1G requirements.
6.How does Aetrix verify that NCP502SQ37T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ37T1G 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 NCP502SQ37T1G meets industry standards.
7.What is the process for return or replacement of NCP502SQ37T1G?
All NCP502SQ37T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ37T1G, 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 NCP502SQ37T1G part is unused and in its original packaging.
Return procedure for NCP502SQ37T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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