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onsemi NCP502SN31T1G
- Part No.:
- NCP502SN31T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP502SN31T1G.pdf
- Description:
- IC REG LINEAR 3.1V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
NCP502SN31T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 3.1 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 (850 mV at 80 mA), and integrated thermal/overcurrent protection - designed for battery-powered portable electronics requiring stable low-power bias.
For engineers reviewing the NCP502SN31T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its TSOP-5 package compatibility, enable threshold logic (1.3 V high / 0.3 V low), ceramic-capacitor stability, and industrial temperature range - critical for handheld instrumentation and compact consumer devices where board space and standby power are constrained.
Technical Context
The NCP502SN31T1G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuitry (thermal shutdown, current limit). Its enable input controls output state via logic-level thresholds, and it operates without minimum load requirement.
Designed for low-noise, low-ESR ceramic capacitors (1.0 µF min), it achieves 55 dB ripple rejection at 1 kHz and 180 µVRMS output noise (100 Hz–100 kHz), with line regulation of 0.4 mV/V and load regulation of 0.2 mV/mA - enabling stable operation under dynamic load transients in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1 V ±2.0% (ensures precise biasing for 3.3 V-tolerant microcontrollers and sensors) |
| Max Output Current | 80 mA (supports moderate-power peripherals like Bluetooth modules or display drivers) |
| Quiescent Current | 40 µA typical (enables multi-year battery life in always-on sensor nodes) |
| Dropout Voltage | 850 mV at 80 mA (allows operation down to ~3.95 V input for 3.1 V output) |
| Operating Temp Range | −40 °C to +85 °C (qualified for industrial-grade embedded applications) |
| Ripple Rejection | 55 dB at 1 kHz (suppresses switching noise from upstream DC/DC converters) |
| Thermal Protection | Internal shutdown at ~160 °C (prevents damage during sustained overload or poor PCB heatsinking) |
Pinout & Package
Package: TSOP-5 (SOT-23-5, Case 483), Pb-free, surface-mount, 3.00 × 1.50 × 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 3.95 V to 12 V input; must be decoupled with ≥1.0 µF ceramic capacitor near pin |
| 2 - GND | Power ground reference | Low-impedance return path essential for noise immunity and thermal performance |
| 3 - Enable | Logic-controlled output enable | Active-high: ≥1.3 V enables regulator; ≤0.3 V disables output (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 output voltage | Delivers stable 3.1 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 enables >10-year battery life in coin-cell–powered IoT sensors |
| 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 reliable sequencing with standard GPIOs and avoids brown-out glitches |
| Integrated protection | Thermal shutdown and current limiting prevent failure during short-circuit or overheating events |
| Precision output accuracy | ±2.0% over full temp/load range reduces need for external calibration in measurement circuits |
Applications
| Portable Medical Sensors | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Continuous glucose monitor using coin-cell battery and low-power ADC. IC Role / Device Role / Timing Role: Provides clean, stable 3.1 V bias to analog front-end and microcontroller core. Use Value: 40 µA quiescent current extends battery life beyond 3 years; ±2% accuracy ensures consistent ADC reference without trimming. |
Use Scenario: Rugged barcode scanner operating in warehouse environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Regulates power to laser diode driver and image sensor interface. Use Value: −40 °C to +85 °C rating ensures reliability across seasonal extremes; 55 dB ripple rejection prevents scan errors from noisy DC/DC sources. |
| Wireless Remote Controls | Smart Home Motion Detectors |
|
Use Scenario: Sub-GHz RF remote with push-button wake-up and BLE pairing. IC Role / Device Role / Timing Role: Supplies regulated 3.1 V to RF transceiver and MCU during active transmission bursts. Use Value: 850 mV dropout allows operation until battery reaches ~3.95 V; fast enable response (<10 µs) supports low-latency wake-up. |
Use Scenario: PIR-based occupancy sensor powered by AA batteries with multi-year lifespan target. IC Role / Device Role / Timing Role: Powers ultra-low-power microcontroller and signal conditioning op-amps in sleep/active cycles. Use Value: N/C pin simplifies layout; 180 µVRMS noise avoids false triggers in high-gain analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3102E/TT | 3.1 V output, 250 mA max, 1.6 µA quiescent current, SOT-23-3 package (no enable) | Lacks enable pin and thermal protection; higher output current but lower precision (±2.5%) | Choose when ultra-low IQ dominates and enable/control sequencing is unnecessary |
| TPS7A0530PDBVR | 3.0 V output (not 3.1 V), 200 mA max, 25 µA IQ, SOT-23-5 with enable, 170 mV dropout | Lower dropout and tighter accuracy (±1%), but 0.1 V output mismatch requires system-level validation | Choose when 3.0 V is acceptable and lowest possible dropout is critical for energy harvesting designs |
Compared with MCP1700T-3102E/TT and TPS7A0530PDBVR, the NCP502SN31T1G uniquely delivers exact 3.1 V output with integrated enable, thermal protection, and ceramic-stable operation in TSOP-5 - balancing precision, safety, and footprint for cost-sensitive portable systems.
Availability
NCP502SN31T1G is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, wireless remote controls, and smart home motion detectors requiring stable component supply and long-term manufacturability.
Supply support for NCP502SN31T1G 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, and consumer markets.
The NCP502SN31T1G belongs to the NCP502 series of low-IQ LDO regulators, engineered specifically for battery-powered portable equipment where ultra-low standby current and small-footprint packaging are essential design constraints.
FAQ
What is the maximum input voltage rating for the NCP502SN31T1G?
The NCP502SN31T1G 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 3.1 V output at 80 mA, the recommended minimum input is 3.95 V (3.1 V + 850 mV dropout), and typical use cases maintain Vin between 4.0 V and 6.0 V to balance efficiency and thermal performance.
Does the NCP502SN31T1G require an external pull-up resistor on the Enable pin?
No, the NCP502SN31T1G does not require an external pull-up on the Enable pin. If enable functionality is unused, the datasheet explicitly states that the Enable pin should be connected directly to Vin to ensure the regulator remains active. The internal circuitry is designed for direct tie-to-rail operation without external biasing components.
Can the NCP502SN31T1G be used with a 1.0 µF ceramic output capacitor?
Yes, the NCP502SN31T1G is fully stable with a 1.0 µF ceramic output capacitor - a key design feature confirmed in both the Applications Information section and Typical Application Diagram. It accepts X5R/X7R dielectrics with ESR ranging from a few mΩ up to 5.0 Ω, eliminating the need for higher-value or specialized capacitors.
Is the NCP502SN31T1G still in active production or discontinued?
The NCP502SN31T1G is marked as discontinued in the official onsemi datasheet revision 23 (April 2026), per the Ordering Information table on page 7. However, Aetrix Electronics maintains legacy inventory and offers lifecycle support including cross-reference guidance, obsolescence mitigation planning, and qualified alternatives for ongoing production needs.
What is the thermal resistance (RJA) of the NCP502SN31T1G in its TSOP-5 package?
The NCP502SN31T1G in TSOP-5 (Case 483) has a junction-to-ambient thermal resistance (RJA) of 205 °C/W under standard test conditions: 1 oz copper, 100 mm² pad area on FR4 PCB. This value is critical for calculating maximum allowable power dissipation - e.g., at 25 °C ambient, max continuous power is ~250 mW before reaching the 125 °C junction limit.
NCP502SN31T1G 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):
- 12V
- Voltage - Output (Min/Fixed):
- 3.1V
- 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:
- 5-TSOP
NCP502SN31T1G FAQ
1.How can I place an order for NCP502SN31T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SN31T1G 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 NCP502SN31T1G reliable?
The price and inventory of NCP502SN31T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SN31T1G is usually 5 days.
3.What payment methods are accepted for NCP502SN31T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SN31T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SN31T1G?
NCP502SN31T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SN31T1G 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 NCP502SN31T1G?
For technical support, including NCP502SN31T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SN31T1G requirements.
6.How does Aetrix verify that NCP502SN31T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SN31T1G 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 NCP502SN31T1G meets industry standards.
7.What is the process for return or replacement of NCP502SN31T1G?
All NCP502SN31T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SN31T1G, 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 NCP502SN31T1G part is unused and in its original packaging.
Return procedure for NCP502SN31T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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