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onsemi NCP502SQ28T1G
- Part No.:
- NCP502SQ28T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ28T1G.pdf
- Description:
- IC REG LINEAR 2.8V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:1,841
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Product details
Overview
NCP502SQ28T1G 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 and ±2.0% output voltage accuracy. It features PMOS pass transistor architecture, thermal shutdown, current limiting, and operates across −40 °C to +85 °C - designed for battery-powered portable electronics requiring stable low-power supply regulation.
For engineers reviewing the NCP502SQ28T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (850 mV @ 80 mA), SC70-5 package footprint, enable threshold compatibility (1.3 V high / 0.3 V low), and ceramic capacitor stability without ESR constraints.
Technical Context
The NCP502SQ28T1G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuits including thermal shutdown and current limit. Its ultra-low quiescent current enables multi-day operation in standby-sensitive applications like handheld instruments and camcorders.
It supports full functionality with only 1.0 µF input and output ceramic capacitors, eliminating ESR requirements. The enable pin provides logic-level control (1.3 V turn-on, 0.3 V turn-off), and the device maintains regulation down to 850 mV dropout at 80 mA load across its industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±2.0% - ensures stable rail for 2.8 V–biased microcontrollers or sensors without external feedback. |
| Max Output Current | 80 mA - sufficient for low-power MCU cores, RF transceivers, or sensor signal chains in portable devices. |
| Quiescent Current | 40 µA typical - extends battery life in always-on monitoring or sleep-mode applications. |
| Dropout Voltage | 850 mV @ 80 mA - allows operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min) sources. |
| Line Regulation | 0.4 mV/V - minimizes output variation during battery discharge or input ripple. |
| Ripple Rejection | 55 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial and consumer-grade portable equipment environments. |
Pinout & Package
The NCP502SQ28T1G is housed in the SC70-5 (Case 419A) surface-mount package - 2.0 mm × 1.25 mm × 0.95 mm, lead-free, micro-miniature footprint optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 2.8 V + dropout up to 12 V; must be decoupled with ≥1.0 µF ceramic capacitor near the pin. |
| 2 - GND | Power supply ground | Reference node for regulation and enable logic; requires low-impedance PCB connection to minimize noise coupling. |
| 3 - Enable | Logic-controlled enable input | Pull ≥1.3 V to activate regulator; pull ≤0.3 V to disable (reducing IQ to 0.1 µA); unused pin must tie to Vin. |
| 4 - N/C | No internal connection | Not bonded internally; PCB trace may be omitted or left floating - no electrical function or thermal impact. |
| 5 - Vout | Regulated output voltage | Delivers stable 2.8 V; requires ≥1.0 µF ceramic output capacitor; ESR-insensitive for robust 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 sensors using coin cells. |
| Ceramic capacitor compatible | No minimum ESR required - eliminates need for costly tantalum or polymer caps; reduces BOM count and cost. |
| Thermal & current protection | Integrated shutdown at ~160 °C and current limit - prevents damage during overload or poor heatsinking. |
| High output accuracy | ±2.0% over temp/load - ensures reliable operation of precision ADCs or voltage-referenced analog circuitry. |
| Low dropout at full load | 850 mV @ 80 mA - maximizes usable battery energy by extending regulation down to low cell voltages. |
Applications
| Portable Medical Sensors | Wireless Remote Controls |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) patch operating from CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 2.8 V supply regulator for ultra-low-power BLE SoC and analog front-end. Use Value: 40 µA IQ and 850 mV dropout extend operational runtime by 3.2× vs. legacy LDOs, enabling monthly disposable form factor. |
Use Scenario: Sub-GHz remote control for smart home hubs, powered by two AAA alkaline cells. IC Role / Device Role / Timing Role: Stable 2.8 V rail for RF transceiver and touch controller during burst transmission. Use Value: Ceramic-capable design eliminates ESR-related instability during 100-ms transmit pulses, preventing brownouts. |
| Handheld Test Meters | Wearable Fitness Trackers |
|
Use Scenario: Pocket-sized multimeter with LCD, microcontroller, and auto-ranging analog circuitry. IC Role / Device Role / Timing Role: Precision 2.8 V reference source for 16-bit ADC and display bias generation. Use Value: ±2.0% output accuracy and 100 ppm/°C tempco ensure <0.1% measurement drift across −10 °C to +50 °C ambient. |
Use Scenario: Optical heart-rate monitor worn 24/7, requiring motion-tolerant optical sensing and Bluetooth LE. IC Role / Device Role / Timing Role: Always-on 2.8 V supply for photodiode amplifier and low-power MCU in sleep mode. Use Value: Enable pin allows synchronous shutdown during motion detection gaps, reducing system IQ to sub-µA levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 30 µA IQ, 600 mV dropout @ 250 mA, SOT-23-3 (no enable) | Lacks enable pin and thermal protection; higher max current but larger package | Select when enable control and integrated protection are non-critical and higher load headroom is needed. |
| TCS2115-2.8V | 25 µA IQ, 750 mV dropout @ 150 mA, SC70-5 with enable, AEC-Q200 qualified | Automotive-qualified; tighter temp range (−40 °C to +125 °C); higher cost | Choose for automotive body electronics where extended temperature compliance and PPAP support are mandatory. |
Compared with MCP1700T-2802E/TT and TCS2115-2.8V, the NCP502SQ28T1G offers balanced trade-offs: enable functionality and thermal protection in SC70-5, lower cost than automotive-grade alternatives, and better dropout performance than many 3-pin competitors - ideal for cost-sensitive, space-constrained industrial portables.
Availability
NCP502SQ28T1G is available at Aetrix Electronics and suitable for portable medical sensors, wireless remote controls, handheld test meters, and wearable fitness trackers requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for NCP502SQ28T1G 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 consumer markets.
The NCP502SQ28T1G belongs to the NCP502 series of ultra-low-IQ LDO regulators engineered specifically for battery-powered handheld communication and portable instrumentation where minimal standby current and small footprint are critical.
FAQ
What is the maximum input voltage rating for the NCP502SQ28T1G?
The NCP502SQ28T1G 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 2.8 V output regulation, Vin must exceed 2.8 V by at least the dropout voltage - typically 850 mV at 80 mA - so minimum functional input is ~3.65 V under full load.
Does the NCP502SQ28T1G require an external resistor network to set output voltage?
No, the NCP502SQ28T1G is a fixed-output regulator with internally trimmed 2.8 V reference. It contains integrated resistors for voltage setting - no external feedback components are needed. This simplifies layout, reduces BOM count, and improves accuracy versus adjustable LDOs with external resistor tolerances.
Can the NCP502SQ28T1G operate without an output capacitor?
No - the datasheet specifies a minimum 1.0 µF ceramic output capacitor (C2) for stability and transient response. While the regulator is ESR-insensitive, omitting C2 risks oscillation, poor load step recovery, and increased output noise. TDK part numbers C2012X5R1C105K or C1608X5R1A105K are recommended.
What is the thermal resistance (RJA) of the NCP502SQ28T1G in its SC70-5 package?
The NCP502SQ28T1G 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 × 15 mm FR4 PCB with 1 oz copper). This value assumes no additional copper pour or thermal vias - adding thermal relief can significantly reduce actual operating junction temperature.
Is the NCP502SQ28T1G pin-compatible with other variants in the NCP502 family?
Yes - all NCP502 SC70-5 variants (e.g., NCP502SQ33T1G, NCP502SQ18T1G) share identical pinout, package dimensions, and terminal functions. Only the output voltage and marking code differ. This enables voltage-scaling flexibility within the same PCB layout, supporting multiple product SKUs with minimal redesign effort.
NCP502SQ28T1G 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):
- 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:
- SC-88A (SC-70-5/SOT-353)
NCP502SQ28T1G FAQ
1.How can I place an order for NCP502SQ28T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ28T1G 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 NCP502SQ28T1G reliable?
The price and inventory of NCP502SQ28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ28T1G is usually 5 days.
3.What payment methods are accepted for NCP502SQ28T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ28T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ28T1G?
NCP502SQ28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ28T1G 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 NCP502SQ28T1G?
For technical support, including NCP502SQ28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ28T1G requirements.
6.How does Aetrix verify that NCP502SQ28T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ28T1G 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 NCP502SQ28T1G meets industry standards.
7.What is the process for return or replacement of NCP502SQ28T1G?
All NCP502SQ28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ28T1G, 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 NCP502SQ28T1G part is unused and in its original packaging.
Return procedure for NCP502SQ28T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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