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onsemi NCP502SQ34T1G
- Part No.:
- NCP502SQ34T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ34T1G.pdf
- Description:
- IC REG LINEAR 3.4V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:3,446
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Product details
Overview
NCP502SQ34T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 3.4 V at up to 80 mA with ultra-low 40 µA typical quiescent current, housed in the SC70-5 (SOT-353) package. It features PMOS pass transistor architecture, ±2.0% output voltage accuracy over temperature, and operates across −40 °C to +85 °C for portable battery-powered systems.
For engineers reviewing the NCP502SQ34T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 80 mA (max 850 mV), enable threshold compatibility (1.3 V high / 0.3 V low), thermal performance in SC70-5 (RJA = 400 °C/W), and ceramic capacitor stability (1.0 µF input/output).
Technical Context
The NCP502SQ34T1G implements a PMOS-based LDO topology with internal voltage reference, error amplifier, and protection circuits including current limit and thermal shutdown. Its enable logic is active-high with defined turn-on/turn-off thresholds, and it requires no minimum load or specific ESR output capacitors.
Designed for low-noise, low-power operation, it achieves 55 dB ripple rejection at 1 kHz and 180 µVrms output noise (100 Hz–100 kHz). Dropout voltage is specified at 3.4 V output with 3% regulation loss, and line/load regulation are tightly controlled at 0.4 mV/V and 0.2 mV/mA respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.4 V ±2.0% - stable regulation across −40 °C to +85 °C and 1.0–80 mA load. |
| Quiescent Current | 40 µA typical - enables multi-year battery life in always-on sensor or standby circuits. |
| Dropout Voltage | 850 mV max at 80 mA - supports operation with input as low as 4.25 V while maintaining 3.4 V output. |
| Ripple Rejection | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Output Noise | 180 µVrms (100 Hz–100 kHz) - suitable for noise-sensitive analog rails (e.g., ADC references, RF bias). |
| Enable Threshold | 1.3 V (high), 0.3 V (low) - compatible with 1.8 V/3.3 V GPIO without level-shifting. |
| Thermal Resistance | 400 °C/W (SC70-5) - requires minimal PCB copper area for thermal management at ≤250 mW dissipation. |
Pinout & Package
Package: SC70-5 (SOT-353), 1.25 mm × 1.65 mm × 0.95 mm, Pb-free, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply rail; accepts 1.3 V to 12 V, must be ≥ Vout + dropout for regulation. |
| 2 | GND | Power ground reference; requires low-impedance connection to minimize noise and dropout error. |
| 3 | Enable | Active-high digital control; pulls device into ultra-low-IQ shutdown (<0.1 µA) when <0.3 V. |
| 4 | N/C | No internal connection; PCB trace may be omitted or left floating - no electrical function. |
| 5 | Vout | Regulated 3.4 V output; stable with 1.0 µF ceramic capacitor; no ESR requirement. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - extends battery runtime in IoT sensors and wearables without sacrificing regulation. |
| Ceramic capacitor compatibility | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| High accuracy output | ±2.0% over full temperature and load range - reduces margining requirements in precision power domains. |
| Integrated protection | Current limit and thermal shutdown - prevents damage during short-circuit or overload without external components. |
| Low-noise regulation | 180 µVrms broadband noise - avoids signal integrity degradation in audio, RF, and precision analog subsystems. |
Applications
| Portable Medical Sensors | Wireless IoT End Nodes |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and low-power MCU with analog front-end. IC Role / Device Role / Timing Role: Primary 3.4 V supply for op-amps, ADC, and BLE radio transceiver during active measurement cycles. Use Value: 40 µA quiescent current enables >3-year battery life; ±2.0% accuracy ensures consistent sensor calibration across operating temperature. |
Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Standby and active-mode LDO for microcontroller, RF IC, and sensing ICs. Use Value: Enable pin allows full system shutdown between transmissions; 850 mV dropout permits operation down to 4.25 V input from aging Li-SOCl₂ cell. |
| Industrial Handheld Scanners | Smart Wearable Displays |
|
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, requiring reliable 3.4 V rail for laser driver and image sensor. IC Role / Device Role / Timing Role: Main voltage regulator for imaging pipeline and interface logic under variable load and ambient temperature. Use Value: 55 dB ripple rejection isolates sensitive analog imaging circuitry from noisy DC/DC converter; SC70-5 footprint saves board space in compact enclosure. |
Use Scenario: Fitness tracker with OLED display, accelerometer, and heart-rate monitor running off single-cell Li-polymer. IC Role / Device Role / Timing Role: Dedicated low-noise 3.4 V supply for display driver IC and optical sensor analog section. Use Value: 180 µVrms output noise prevents visible flicker or color banding on OLED; 1.25 mm × 1.65 mm SC70-5 fits tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3402E/TT | 3.4 V output, 250 mA rating, 1.6 µA quiescent current, SOT-23-3 package (no enable pin) | Lacks enable control and has higher max output current; better for simpler, always-on designs | Select when ultra-low IQ is critical and enable functionality is unnecessary. |
| Torex XC6206P342MR-G | 3.4 V output, 250 mA rating, 1 µA quiescent current, SOT-25 package (enable pin included) | Lower IQ but higher dropout (1.1 V @ 250 mA); not rated for automotive temp range | Prefer for ultra-long-life battery applications where dropout margin allows. |
Compared with MCP1700T-3402E/TT and XC6206P342MR-G, the NCP502SQ34T1G offers balanced trade-offs: moderate IQ (40 µA), integrated enable, industrial temperature range, and proven ceramic-capacitor stability - making it optimal for cost- and size-constrained portable electronics requiring design flexibility and reliability.
Availability
NCP502SQ34T1G is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT end nodes, industrial handheld scanners, smart wearable displays, and battery-powered instrumentation requiring stable component supply and long-lifecycle support.
Supply support for NCP502SQ34T1G 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 silicon solutions for automotive, industrial, cloud, and IoT applications.
The NCP502 series belongs to onsemi's low-power linear regulator product line, engineered specifically for handheld communication equipment and portable battery-powered devices demanding ultra-low quiescent current and small-footprint packaging.
FAQ
What is the maximum input voltage for the NCP502SQ34T1G?
The NCP502SQ34T1G 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 regulation at 3.4 V output, input must exceed 4.25 V (3.4 V + 850 mV dropout) - typical use cases apply 4.5 V to 6.0 V inputs to ensure margin across temperature and load.
Does the NCP502SQ34T1G require an external pull-up resistor on the Enable pin?
No, the NCP502SQ34T1G does not require an external pull-up on the Enable pin. When unused, the datasheet explicitly states that Enable should be connected directly to Vin to ensure default operation. The internal logic is designed for direct tie-to-rail use, eliminating BOM cost and board space for discrete resistors.
Can the NCP502SQ34T1G be used with ceramic capacitors smaller than 1.0 µF?
The NCP502SQ34T1G is characterized and guaranteed stable with 1.0 µF ceramic capacitors (X5R/X7R), and the datasheet does not validate stability below this value. Using smaller capacitance may compromise transient response and noise performance; therefore, 1.0 µF is the minimum recommended value for robust design across all conditions.
Is the NCP502SQ34T1G RoHS-compliant and halogen-free?
Yes, the NCP502SQ34T1G is a Pb-free device per the datasheet marking note ("= Pb-Free Package") and complies with RoHS Directive 2011/65/EU. onsemi confirms halogen-free status for this part family in its material declarations - chlorine and bromine content are below 900 ppm each, meeting IPC-4101D requirements.
What is the thermal shutdown trigger temperature for the NCP502SQ34T1G?
The NCP502SQ34T1G incorporates thermal protection that activates at approximately 160 °C junction temperature, as stated in the Definitions section. Once triggered, the regulator shuts down output until junction temperature falls below the hysteresis threshold (~140 °C), preventing permanent damage during sustained overload or poor PCB thermal design.
NCP502SQ34T1G 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):
- 3.4V
- 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:
- SC-88A (SC-70-5/SOT-353)
NCP502SQ34T1G FAQ
1.How can I place an order for NCP502SQ34T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ34T1G 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 NCP502SQ34T1G reliable?
The price and inventory of NCP502SQ34T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ34T1G is usually 5 days.
3.What payment methods are accepted for NCP502SQ34T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ34T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ34T1G?
NCP502SQ34T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ34T1G 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 NCP502SQ34T1G?
For technical support, including NCP502SQ34T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ34T1G requirements.
6.How does Aetrix verify that NCP502SQ34T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ34T1G 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 NCP502SQ34T1G meets industry standards.
7.What is the process for return or replacement of NCP502SQ34T1G?
All NCP502SQ34T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ34T1G, 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 NCP502SQ34T1G part is unused and in its original packaging.
Return procedure for NCP502SQ34T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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