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onsemi NCP502SQ29T2G
- Part No.:
- NCP502SQ29T2G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ29T2G.pdf
- Description:
- IC REG LINEAR 2.9V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:2,407
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Product details
Overview
NCP502SQ29T2G from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 2.9 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 for low dropout performance and is designed for battery-powered portable electronics requiring stable, ultra-low-power regulation.
For engineers reviewing the NCP502SQ29T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its SC70-5 package footprint, 2.9 V fixed output, enable threshold (1.3 V high / 0.3 V low), dropout voltage of 850 mV at 80 mA, and compatibility with low-ESR ceramic capacitors without stability compensation.
Technical Context
The NCP502SQ29T2G implements a PMOS-based linear regulation architecture with internal voltage reference, error amplifier, current limiting, and thermal shutdown. Its enable input provides logic-level control with defined high/low thresholds, and it operates without external compensation due to inherent stability with 1.0 µF ceramic output capacitance.
Designed for handheld and portable applications, it supports input voltages from 2.9 V + dropout up to 12 V, maintains regulation across industrial temperature range (−40 °C to +85 °C), and delivers 180 mA peak short-circuit current while rejecting 55 dB ripple at 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9 V ±2.0% at 10 mA, ensuring precise rail generation for low-voltage microcontrollers and sensors. |
| Quiescent Current | 40 µA typical (enable = VIN), enabling >1-year battery life in always-on IoT sensor nodes drawing <10 µA average. |
| Dropout Voltage | 850 mV max at 80 mA load, allowing operation from single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) sources. |
| Line Regulation | 0.4 mV/V typical, minimizing output drift during battery discharge or supply ripple. |
| Load Regulation | 0.2 mV/mA typical, maintaining tight voltage control across dynamic load steps (e.g., RF transmit bursts). |
| Ripple Rejection | 55 dB at 1 kHz, suppressing switching noise from upstream DC-DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at ~160 °C junction temperature, protecting against 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 power supply input | Accepts 2.9 V + dropout to 12 V; requires local 1.0 µF ceramic decoupling capacitor. |
| 2 - GND | Power supply ground reference | Must be low-impedance connection to system ground plane to ensure regulation accuracy and transient response. |
| 3 - Enable | Logic-controlled regulator enable | Pull ≥1.3 V to enable output; pull ≤0.3 V to disable (ultra-low standby current); tie to Vin if unused. |
| 4 - N/C | No internal connection | Not bonded internally; PCB trace may be omitted or left floating-no electrical function. |
| 5 - Vout | Regulated output voltage | Delivers stable 2.9 V; requires 1.0 µF ceramic output capacitor placed adjacent to pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical enables multi-year operation in coin-cell–powered wearables and remote sensors. |
| PMOS pass transistor architecture | Eliminates need for external compensation and ensures stability with 1.0 µF ceramic capacitors only. |
| Enable input with defined thresholds | 1.3 V (on) / 0.3 V (off) logic levels simplify direct interfacing with 1.8 V or 3.3 V microcontroller GPIOs. |
| ±2.0% output voltage accuracy | Guarantees compliance with tight supply tolerances of modern low-voltage ASICs and RF ICs. |
| Thermal and current protection | Integrated shutdown prevents damage during overload, short-circuit, or inadequate heatsinking. |
Applications
| Portable Medical Sensors | Wireless IoT End Nodes |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and ultra-low-power MCU. IC Role / Device Role / Timing Role: Primary 2.9 V supply regulator for analog front-end and BLE SoC. Use Value: 40 µA quiescent current extends battery life beyond 2 years; ±2.0% accuracy ensures ADC reference stability. |
Use Scenario: Battery-operated environmental sensor node transmitting data via LoRaWAN every 10 minutes. IC Role / Device Role / Timing Role: Standby power regulator enabling fast wake-up and controlled power sequencing. Use Value: Enable pin allows MCU to shut down LDO between transmissions, reducing average system current to <5 µA. |
| Handheld Test Instruments | Industrial Hand Scanners |
Use Scenario: Pocket-sized multimeter with LCD display and precision analog measurement circuitry. IC Role / Device Role / Timing Role: Clean, low-noise 2.9 V rail for op-amps and ADC reference. Use Value: 180 µVRMS output noise and 55 dB ripple rejection preserve measurement resolution under noisy supply conditions. |
Use Scenario: Rugged barcode scanner powered by rechargeable NiMH pack with variable voltage (2.4–3.6 V). IC Role / Device Role / Timing Role: Input-to-2.9 V regulator supporting wide input range and transient load steps during laser activation. Use Value: 850 mV dropout at 80 mA ensures regulation even at end-of-discharge; load regulation of 0.2 mV/mA stabilizes imaging sensor bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2902E/TT | 350 mA output current, 1.6 µA quiescent current, SOT-23-3 package (no enable pin) | Lacks enable control and has higher max output current; better suited for higher-load, always-on systems | Select when higher current capability and lower IQ outweigh need for enable functionality and SC70 footprint. |
| TNIV2900002900000 | 2.9 V fixed, 150 mA, 25 µA IQ, TSOP-5 package, AEC-Q100 qualified | Automotive-grade qualification and higher current rating; same pinout but different marking and thermal resistance | Choose for automotive body electronics where AEC-Q100 compliance and extended temperature range (−40 °C to +125 °C) are mandatory. |
Compared with MCP1700T-2902E/TT and TNIV2900002900000, the NCP502SQ29T2G offers optimal balance of ultra-low IQ, enable control, and minimal SC70-5 footprint for space-constrained portable designs-without over-specifying current or qualification requirements.
Availability
NCP502SQ29T2G is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT end nodes, handheld test instruments, and industrial hand scanners requiring stable component supply with consistent parametric performance and long-term sourcing continuity.
Supply support for NCP502SQ29T2G 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, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The NCP502 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for ultra-low-power, battery-operated portable equipment where quiescent current, small footprint, and output accuracy are critical design constraints.
FAQ
What is the maximum input voltage rating for the NCP502SQ29T2G?
The NCP502SQ29T2G supports an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent device damage. For reliable long-term use, input voltage should remain within 2.9 V + dropout (≤3.75 V at 80 mA) up to 12 V, with thermal limits observed based on PCB layout and ambient conditions.
Does the NCP502SQ29T2G require external compensation components?
No, the NCP502SQ29T2G is internally compensated and stable with a minimum 1.0 µF ceramic output capacitor. The datasheet confirms no ESR requirements or external compensation networks are needed-enabling simplified, low-BOM-count designs ideal for space-constrained portable devices.
What is the thermal resistance (RJA) of the NCP502SQ29T2G in its SC70-5 package?
The NCP502SQ29T2G 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 minimal copper spreading; actual RJA improves significantly with enhanced PCB thermal pads and vias.
Can the NCP502SQ29T2G be used with tantalum output capacitors?
Yes, the NCP502SQ29T2G supports both ceramic and tantalum output capacitors. The datasheet explicitly states it accepts capacitors with ESR ranging from a few mΩ up to 5.0 Ω, and recommends 1.0 µF minimum-making it compatible with common tantalum types like TDK C2012X5R1C105K without stability concerns.
Is the NCP502SQ29T2G still in active production or discontinued?
The NCP502SQ29T2G remains orderable and supported per onsemi's official documentation. While several NCP502 variants were marked discontinued in Revision 23 (April 2026), NCP502SQ29T2G is not listed among them in the Ordering Information table on page 7, confirming its active status and availability through authorized channels including Aetrix Electronics.
NCP502SQ29T2G 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):
- 2.9V
- 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)
NCP502SQ29T2G FAQ
1.How can I place an order for NCP502SQ29T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ29T2G 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 NCP502SQ29T2G reliable?
The price and inventory of NCP502SQ29T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ29T2G is usually 5 days.
3.What payment methods are accepted for NCP502SQ29T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ29T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ29T2G?
NCP502SQ29T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ29T2G 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 NCP502SQ29T2G?
For technical support, including NCP502SQ29T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ29T2G requirements.
6.How does Aetrix verify that NCP502SQ29T2G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ29T2G 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 NCP502SQ29T2G meets industry standards.
7.What is the process for return or replacement of NCP502SQ29T2G?
All NCP502SQ29T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ29T2G, 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 NCP502SQ29T2G part is unused and in its original packaging.
Return procedure for NCP502SQ29T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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