My Inquiry
My Account
onsemi NCP502SQ29T1G
- Part No.:
- NCP502SQ29T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ29T1G.pdf
- Description:
- IC REG LINEAR 2.9V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:4,352
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP502SQ29T1G from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 2.9 V at up to 80 mA, featuring 40 µA typical quiescent current, ±2.0% output voltage accuracy, and operation across −40 °C to +85 °C - designed for battery-powered handheld instruments requiring stable, ultra-low-power regulation.
For engineers reviewing the NCP502SQ29T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (850 mV max at 80 mA), enable threshold compatibility (1.3 V high / 0.3 V low), SC70-5 package thermal resistance (400 °C/W), and ceramic capacitor stability with 1.0 µF input/output.
Technical Context
The NCP502SQ29T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit, thermal shutdown) in a single die. Its architecture enables stable regulation with low ESR ceramic capacitors and eliminates need for external compensation.
It operates with an enable-controlled standby mode: pulling Enable low disables output and reduces IQ to ≤0.1 µA; connecting Enable to Vin ensures always-on operation. The device exhibits 55 dB ripple rejection at 1 kHz and 180 µVRMS output noise (100 Hz–100 kHz), supporting noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.9 V ±2.0% - ensures stable supply for 2.8–3.0 V logic rails and analog sensors without external feedback. |
| Max Output Current | 80 mA - sufficient for microcontrollers, RF transceivers, and sensor interfaces in portable devices. |
| Quiescent Current | 40 µA typical - extends battery life in always-on monitoring applications (e.g., wearables, IoT endpoints). |
| Dropout Voltage | 850 mV max at 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 - maintains tight output stability despite battery voltage sag during discharge. |
| Load Regulation | 0.2 mV/mA - minimizes output shift under dynamic load changes (e.g., MCU wake-up bursts). |
| Ripple Rejection | 55 dB at 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 NCP502SQ29T1G is housed in the SC70-5 (Case 419A) surface-mount package - 2.0 mm × 1.25 mm × 0.9 mm, lead-free, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 2.9 V + dropout (≥3.75 V) up to 12 V; requires local 1.0 µF ceramic decoupling. |
| 2 - GND | Power supply ground reference | Must be low-impedance connection to PCB ground plane to ensure regulation accuracy and transient response. |
| 3 - Enable | Active-high enable control input | Logic high ≥1.3 V enables output; logic low ≤0.3 V disables output and reduces IQ to ≤0.1 µA. |
| 4 - N/C | No internal connection | Not bonded; PCB trace may be omitted or left floating - no electrical function or thermal impact. |
| 5 - Vout | Regulated output voltage | Delivers 2.9 V ±2.0% to load; requires 1.0 µF ceramic output capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - enables multi-year battery life in coin-cell–powered devices like remote sensors. |
| Ceramic capacitor compatible | Stable with 1.0 µF ±20% X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic capacitors. |
| Enable-controlled shutdown | 0.1 µA standby IQ with Enable low - supports deep-sleep modes in microcontroller-based systems. |
| Thermal shutdown protection | Activates at ~160 °C junction temperature - prevents damage during overload or poor PCB thermal design. |
| High PSRR at audio frequencies | 55 dB at 1 kHz - preserves signal integrity in audio codecs, ADC references, and RF front-end biasing. |
| Pb-free and RoHS compliant | SC70-5 package meets J-STD-020 MSL1 - suitable for lead-free reflow assembly without moisture sensitivity concerns. |
Applications
| Portable Medical Sensors | Wearable Fitness Monitors |
|---|---|
Use Scenario: Continuous heart-rate and SpO₂ sensing using optical analog front-end powered from coin cell. IC Role / Device Role / Timing Role: Primary 2.9 V bias regulator for photodiode amplifier and ADC reference. Use Value: 40 µA quiescent current enables >2-year runtime; ±2.0% accuracy ensures consistent sensor gain calibration. |
Use Scenario: Multi-sensor hub (accelerometer, gyroscope, ambient light) in wrist-worn tracker. IC Role / Device Role / Timing Role: Low-noise 2.9 V supply for MEMS sensor interface and BLE radio I/O domain. Use Value: 180 µVRMS output noise prevents signal corruption; SC70-5 footprint saves board space. |
| Industrial Handheld Scanners | Smart Home Remote Sensors |
Use Scenario: Battery-operated barcode scanner with laser driver and image sensor requiring clean 2.9 V rail. IC Role / Device Role / Timing Role: Main LDO for imaging pipeline and laser diode bias control logic. Use Value: 850 mV dropout enables use of partially discharged 3.6 V Li-ion; 55 dB PSRR suppresses DC/DC switching noise. |
Use Scenario: Zigbee- or Thread-enabled temperature/humidity sensor node powered by AA batteries. IC Role / Device Role / Timing Role: Always-on 2.9 V regulator enabling fast wake-from-sleep for periodic reporting. Use Value: Enable pin allows host MCU to gate power, reducing system standby current to <1 µA total. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2902E/TT | 2.9 V output, 250 mA max, 1.6 µA IQ - higher current but significantly lower quiescent current. | Preferred where ultra-low IQ dominates over cost or package size; requires SOT-23-3 (no enable pin). | Select if system demands sub-µA standby and can accommodate non-enable, higher-current LDO. |
| TPS70629DBVR | 2.9 V output, 150 mA max, 1.3 µA IQ, enable pin - superior IQ and current, but larger SOT-23-5 package. | Better suited for designs needing margin in load current or tighter thermal performance (RJA = 210 °C/W). | Choose when higher output current headroom and lower thermal resistance justify larger footprint. |
Compared with MCP1700T-2902E/TT and TPS70629DBVR, the NCP502SQ29T1G offers optimal balance of ultra-low IQ (40 µA), integrated enable, SC70-5 compactness, and industrial temperature range - making it ideal for space-constrained, battery-critical applications where 80 mA suffices.
Availability
NCP502SQ29T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness monitors, industrial handheld scanners, and smart home remote sensors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP502SQ29T1G 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP502SQ29T1G belongs to the NCP502 series of low-IQ LDO regulators, engineered specifically for handheld communication and portable battery-powered equipment demanding minimal standby power and ceramic capacitor compatibility.
FAQ
What is the maximum input voltage rating for the NCP502SQ29T1G?
The NCP502SQ29T1G 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 2.9 V output, minimum input must exceed dropout voltage (850 mV at 80 mA), so Vin ≥ 3.75 V is required under full load. Derating is recommended for thermal safety at high ambient temperatures.
Does the NCP502SQ29T1G require external capacitors, and what values are recommended?
Yes, the NCP502SQ29T1G requires both input (CIN) and output (COUT) capacitors. The datasheet specifies 1.0 µF ceramic (X5R/X7R) for both, placed as close as possible to the respective pins. Larger values improve transient response and noise rejection; the device remains stable with ESR from a few mΩ up to 5 Ω - enabling use of low-cost multilayer ceramic capacitors without special ESR requirements.
How does the enable function operate on the NCP502SQ29T1G?
The Enable pin (Pin 3) is active-high: output regulates when voltage ≥1.3 V (typical turn-on threshold); output shuts down when voltage ≤0.3 V (typical turn-off threshold). When unused, Enable must be tied to Vin to ensure continuous operation. In shutdown, quiescent current drops to ≤0.1 µA, making it ideal for MCU-controlled power gating in battery-powered systems.
Is the NCP502SQ29T1G 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 electrical interface. Only the output voltage differs; no PCB layout change is needed when substituting between fixed-voltage versions in the same package suffix (SQ). Thermal and electrical behavior remain consistent across the family.
What is the thermal resistance (RJA) of the NCP502SQ29T1G in its SC70-5 package?
The NCP502SQ29T1G in SC70-5 (Case 419A) has a junction-to-ambient thermal resistance (RJA) of 400 °C/W under standard test conditions (1 oz copper, 100 mm² pad area). This value assumes minimal PCB copper; actual RJA improves significantly with enhanced thermal pads or multiple vias to inner ground planes - critical for sustaining 80 mA at elevated ambient temperatures.
NCP502SQ29T1G 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)
NCP502SQ29T1G FAQ
1.How can I place an order for NCP502SQ29T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ29T1G 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 NCP502SQ29T1G reliable?
The price and inventory of NCP502SQ29T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ29T1G is usually 5 days.
3.What payment methods are accepted for NCP502SQ29T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ29T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ29T1G?
NCP502SQ29T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ29T1G 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 NCP502SQ29T1G?
For technical support, including NCP502SQ29T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ29T1G requirements.
6.How does Aetrix verify that NCP502SQ29T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ29T1G 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 NCP502SQ29T1G meets industry standards.
7.What is the process for return or replacement of NCP502SQ29T1G?
All NCP502SQ29T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ29T1G, 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 NCP502SQ29T1G part is unused and in its original packaging.
Return procedure for NCP502SQ29T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP502SQ29T1G Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
