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onsemi NCP502SN28T1G
- Part No.:
- NCP502SN28T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP502SN28T1G.pdf
- Description:
- IC REG LINEAR 2.8V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,923
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Product details
Overview
NCP502SN28T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 2.8 V at up to 80 mA with 40 µA typical quiescent current, 2.0% output voltage accuracy, and 850 mV dropout (at 80 mA, TA = −40 °C to +85 °C), designed for battery-powered portable electronics such as handheld instruments and camcorders.
For engineers reviewing the NCP502SN28T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its TSOP-5 package thermal resistance (205 °C/W), enable threshold compatibility (1.3 V high / 0.3 V low), and ceramic-capacitor stability without minimum ESR requirements.
Technical Context
The NCP502SN28T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit and thermal shutdown) in a single die. Its ultra-low IQ enables extended battery life in always-on subsystems while maintaining regulation under load transients up to 80 mA.
It operates across an input voltage range of 1.3 V above VOUT to 12 V, supports stable operation with 1.0 µF ceramic output capacitors, and features logic-level enable control with hysteresis-no external pull-up required when unused (connect to VIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±2.0% (ensures consistent biasing for 2.8 V logic or analog rails) |
| Max Output Current | 80 mA (supports microcontrollers, sensors, and RF front-ends in compact portable designs) |
| Quiescent Current | 40 µA typical (enables >1-year battery life in 10 µA standby systems with coin cells) |
| Dropout Voltage | 850 mV at 80 mA (allows operation down to 3.65 V input for 2.8 V output, extending usable battery range) |
| Line Regulation | 0.4 mV/V typical (minimizes output drift during battery discharge or supply ripple) |
| 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 consumer-grade portable equipment) |
Pinout & Package
Package: TSOP-5 (Case 483), 3.00 × 1.50 × 0.95 mm, Pb-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 4.3 V to 12 V; 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 ON/OFF input | Active-high: ≥1.3 V turns regulator on; ≤0.3 V disables output; float 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 terminal | Delivers stable 2.8 V; requires ≥1.0 µF ceramic capacitor directly at pin for transient stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical enables multi-year operation from CR2032 batteries in IoT endpoints |
| 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 enables direct interfacing with 1.8 V or 3.3 V GPIO without level shifters |
| Thermal shutdown protection | Activates at ~160 °C junction temperature-prevents damage during sustained overload or poor PCB heatsinking |
| ±2.0% output accuracy | Guarantees 2.744–2.856 V over temp/load ensures reliable ADC reference or core logic supply |
Applications
| Handheld Medical Sensors | Wearable Fitness Trackers |
|---|---|
Use Scenario: Powering optical heart-rate sensor ICs and low-power BLE SoCs in wrist-worn devices with coin-cell batteries. IC Role / Device Role / Timing Role: Primary 2.8 V LDO supplying analog front-end and digital core; provides clean, low-noise rail independent of battery voltage decay. Use Value: 40 µA IQ extends CR2032 battery life beyond 12 months; 55 dB ripple rejection prevents switching noise from BLE radio from corrupting photodiode measurements. |
Use Scenario: Regulating power to accelerometer, gyroscope, and display driver in compact fitness bands. IC Role / Device Role / Timing Role: Fixed 2.8 V supply enabling consistent sensor biasing and display contrast across 2.8–4.2 V Li-ion operating range. Use Value: 850 mV dropout allows full utilization of battery capacity down to 3.65 V; TSOP-5 footprint saves board space versus SOT-23 alternatives. |
| Industrial Handheld Scanners | Portable Audio Recorders |
Use Scenario: Providing regulated 2.8 V to laser diode drivers and decode ASICs in rugged barcode scanners. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown protecting against overheating during continuous scan operation. Use Value: −40 °C to +85 °C rating ensures operation in warehouse/freezer environments; 2.0% accuracy maintains decoder timing margins. |
Use Scenario: Supplying audio codec and MEMS microphone bias in pocket-sized digital voice recorders. IC Role / Device Role / Timing Role: Low-noise 2.8 V rail minimizing audible hiss and quantization errors in analog signal chain. Use Value: 180 µVrms output noise preserves SNR; ceramic-capacitor compatibility avoids ESR-related instability in high-frequency audio 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-2802E/TT | 250 mA max output, 1.6 µA IQ, SOT-23-3 (no enable pin) | Lacks enable control; higher output current but larger dropout (600 mV @ 250 mA) | Choose when ultra-low IQ dominates and enable functionality is unnecessary |
| Torex XC6206P282MR-G | 150 mA max output, 1 µA IQ, SOT-23-5 (enable pin, 0.8 V threshold) | Lower IQ but incompatible enable logic (0.8 V high threshold vs. NCP502's 1.3 V); different pinout | Choose for extreme battery life where GPIO voltage levels permit 0.8 V enable |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP502SN28T1G uniquely balances 80 mA capability, 40 µA IQ, logic-compatible enable, and TSOP-5 thermal performance-making it optimal for space-constrained, battery-sensitive 2.8 V systems requiring controlled power sequencing.
Availability
NCP502SN28T1G is available at Aetrix Electronics and suitable for handheld medical sensors, wearable fitness trackers, industrial handheld scanners, and portable audio recorders requiring stable component supply with long-term manufacturability assurance.
Supply support for NCP502SN28T1G 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, and sensor solutions for automotive, industrial, and portable electronics.
The NCP502 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-operated devices demanding ultra-low quiescent current, small footprint, and ceramic-capacitor compatibility without sacrificing regulation accuracy or transient response.
FAQ
What is the maximum input voltage for the NCP502SN28T1G?
The NCP502SN28T1G 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 2.8 V regulation, input should be ≥3.65 V (2.8 V + 850 mV dropout) and ≤12 V, with derating advised above 85 °C ambient.
Does the NCP502SN28T1G require an external capacitor on the Enable pin?
No, the NCP502SN28T1G does not require an external capacitor on the Enable pin. The enable input is CMOS-compatible with hysteresis; it draws negligible current and responds directly to logic-level signals. If unused, the pin must be tied to VIN-not left floating-to ensure guaranteed turn-on behavior.
Can the NCP502SN28T1G be used with a 10 µF tantalum capacitor instead of ceramic?
Yes, the NCP502SN28T1G is stable with tantalum capacitors, including 10 µF units, as confirmed in the Applications Information section. However, the datasheet specifies minimum 1.0 µF capacitance and permits ESR up to 5.0 Ω-so any 10 µF tantalum meeting those criteria is acceptable, though ceramic remains preferred for lower ESR and smaller size.
What is the thermal resistance (RJA) of the NCP502SN28T1G in its TSOP-5 package?
The NCP502SN28T1G in TSOP-5 (Case 483) has a thermal resistance RJA of 205 °C/W under standard test conditions: 1 oz copper, 100 mm² pad area on FR4 PCB. This value assumes optimal PCB layout; actual RJA will increase with smaller copper areas or higher ambient temperatures.
Is the NCP502SN28T1G still in active production or discontinued?
The NCP502SN28T1G is marked as discontinued in the April 2026 revision of the official onsemi datasheet (Rev. 23). However, Aetrix Electronics maintains active inventory and supply-chain continuity support-including last-time-buy planning and cross-reference assistance-for customers transitioning from this part.
NCP502SN28T1G 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 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
NCP502SN28T1G FAQ
1.How can I place an order for NCP502SN28T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SN28T1G 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 NCP502SN28T1G reliable?
The price and inventory of NCP502SN28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SN28T1G is usually 5 days.
3.What payment methods are accepted for NCP502SN28T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SN28T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SN28T1G?
NCP502SN28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SN28T1G 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 NCP502SN28T1G?
For technical support, including NCP502SN28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SN28T1G requirements.
6.How does Aetrix verify that NCP502SN28T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SN28T1G 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 NCP502SN28T1G meets industry standards.
7.What is the process for return or replacement of NCP502SN28T1G?
All NCP502SN28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SN28T1G, 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 NCP502SN28T1G part is unused and in its original packaging.
Return procedure for NCP502SN28T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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