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onsemi NCP502SQ34T2G
- Part No.:
- NCP502SQ34T2G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP502SQ34T2G.pdf
- Description:
- IC REG LINEAR 3.4V 80MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
NCP502SQ34T2G from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 3.4 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 low-power rail generation.
For engineers reviewing the NCP502SQ34T2G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 80 mA (850 mV max), 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 NCP502SQ34T2G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit, thermal shutdown) in a single die. Its ultra-low IQ architecture enables operation directly from single-cell Li-ion or multi-cell alkaline sources without significant standby drain.
It operates with no minimum load requirement and supports ceramic output capacitors down to 1.0 µF - eliminating ESR constraints common in older LDOs. The enable pin provides logic-level control with hysteresis, allowing clean power sequencing in portable systems with tight supply budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.4 V ±2.0% - tightly regulated rail suitable for 3.3 V I/O domains with margin for voltage drop and noise. |
| Max Output Current | 80 mA - sufficient for microcontrollers, sensors, and RF front-ends in compact portable devices. |
| Quiescent Current | 40 µA typical - enables >1-year battery life in always-on sensor nodes powered by CR2032 or similar. |
| Dropout Voltage | 850 mV max at 80 mA - allows regulation from 4.25 V input (e.g., partially discharged Li-ion) to 3.4 V output. |
| Line Regulation | 0.4 mV/V typical - maintains output stability despite battery voltage sag during pulse loads. |
| 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 portable equipment environments. |
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 input supply | Accepts 3.4 V to 12 V; must be decoupled with ≥1.0 µF ceramic capacitor near pin. |
| 2 - GND | Power ground reference | Low-impedance return path for input/output currents; requires solid PCB ground plane connection. |
| 3 - Enable | Logic-controlled ON/OFF input | Pull ≥1.3 V to enable regulator; pull ≤0.3 V to disable (IQ drops to 0.1 µA); unused pin tied to Vin. |
| 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 | Delivers 3.4 V ±2% to load; requires ≥1.0 µF ceramic capacitor placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - extends battery runtime in always-on, low-duty-cycle applications like remote sensors. |
| Ceramic capacitor compatible | Stable with 1.0 µF output capacitance - eliminates need for costly tantalum or high-ESR capacitors. |
| Enable with precise thresholds | 1.3 V turn-on / 0.3 V turn-off - ensures reliable sequencing with standard GPIOs and avoids brown-out glitches. |
| Thermal shutdown protection | Activates at ~160 °C junction temperature - prevents damage during sustained overload or poor PCB thermal design. |
| ±2.0% output accuracy | Over temp/load/input range - meets tight tolerance requirements of ADC references and MCU core rails. |
Applications
| Portable Medical Sensors | Wireless Remote Controls |
|---|---|
|
Use Scenario: Continuous glucose monitor using coin-cell battery and ultra-low-power MCU with analog front-end. IC Role / Device Role / Timing Role: Primary 3.4 V supply for op-amps, ADC, and BLE SoC; enables <1 µA sleep current when system is idle. Use Value: 40 µA IQ preserves battery capacity over multi-month deployment; ±2% accuracy ensures consistent sensor calibration. |
Use Scenario: IR-based universal remote with motion wake-up and Bluetooth LE pairing. IC Role / Device Role / Timing Role: Regulates 3.4 V rail for microcontroller and IR LED driver; enable pin synchronized with motion-detect interrupt. Use Value: 850 mV dropout allows full utilization of 3.6 V nominal alkaline stack; SC70-5 footprint saves board space in slim form factor. |
| Handheld Test Meters | Smart Home Motion Detectors |
|
Use Scenario: Battery-powered multimeter with LCD display, precision reference, and auto-ranging circuitry. IC Role / Device Role / Timing Role: Supplies stable 3.4 V to 16-bit SAR ADC and reference buffer; rejects ripple from internal charge pump. Use Value: 55 dB ripple rejection at 1 kHz suppresses switching artifacts; 0.4 mV/V line regulation maintains reading accuracy as battery depletes. |
Use Scenario: PIR-based occupancy sensor with Zigbee radio and ambient light sensing. IC Role / Device Role / Timing Role: Powers MCU, radio transceiver, and analog signal chain; enable pin used for deep-sleep wake-up control. Use Value: N/C pin simplifies layout routing; SC70-5 thermal resistance (400 °C/W) accommodates limited copper area in compact enclosure. |
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 | 300 mA rated, 1.6 µA IQ, SOT-23-3 package (no enable) | Lacks enable control and thermal shutdown; higher output current unnecessary for 80 mA use cases | Choose only if enable functionality is not required and board space permits larger SOT-23-3 footprint |
| TPS70634DBVR | 300 mA rated, 1.7 µA IQ, 1.5% accuracy, SOT-23-5 with enable | Lower IQ but tighter accuracy and higher current; RJA = 250 °C/W (TSOP-5) vs. 400 °C/W (SC70-5) | Prefer for longer battery life where thermal headroom exists; NCP502SQ34T2G remains optimal for ultra-compact layouts |
Compared with MCP1700T-3402E/TT and TPS70634DBVR, the NCP502SQ34T2G offers the smallest footprint (SC70-5), integrated thermal protection, and enable functionality - making it uniquely suited for space-constrained, battery-sensitive designs where moderate current and robustness are prioritized over ultra-low IQ or highest accuracy.
Availability
NCP502SQ34T2G is available at Aetrix Electronics and suitable for portable medical sensors, wireless remote controls, handheld test meters, and smart home motion detectors requiring stable component supply with long-term manufacturability assurance.
Supply support for NCP502SQ34T2G 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, with leadership in power management, analog, and sensor technologies.
The NCP502 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-operated portable electronics demanding minimal quiescent current, small footprint, and robust operation under variable load and temperature conditions.
FAQ
What is the maximum input voltage rating for the NCP502SQ34T2G?
The NCP502SQ34T2G 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 3.4 V regulation, input should remain ≥4.25 V (3.4 V + 850 mV dropout) and ≤12 V, with derating recommended above 85 °C ambient.
Does the NCP502SQ34T2G require an external capacitor on the enable pin?
No, the NCP502SQ34T2G does not require an external capacitor on the enable pin. The enable input is CMOS-compatible with defined high/low thresholds (1.3 V and 0.3 V) and exhibits negligible input current. If unused, the enable pin must be tied directly to Vin - not left floating - to ensure guaranteed operation.
Can the NCP502SQ34T2G operate without an output capacitor?
No - the NCP502SQ34T2G requires a minimum 1.0 µF ceramic output capacitor for stability, as confirmed in the Applications Information section. Omitting COUT risks oscillation, poor transient response, and potential device failure under load changes. Larger values improve noise rejection and load step performance.
Is the NCP502SQ34T2G still in active production or discontinued?
The NCP502SQ34T2G is marked as discontinued per the April 2026 revision of the official datasheet (Rev. 23, page 7). However, Aetrix Electronics maintains legacy inventory and supports design-in continuity through controlled allocation, extended lifecycle sourcing, and cross-reference guidance for migration paths.
What is the thermal resistance (RJA) of the NCP502SQ34T2G in its SC70-5 package?
The NCP502SQ34T2G 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 spread area). This value assumes optimal PCB layout; actual RJA improves significantly with added copper pour or thermal vias beneath the exposed pad (if present) - though the SC70-5 variant has no thermal pad.
NCP502SQ34T2G 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)
NCP502SQ34T2G FAQ
1.How can I place an order for NCP502SQ34T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SQ34T2G 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 NCP502SQ34T2G reliable?
The price and inventory of NCP502SQ34T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SQ34T2G is usually 5 days.
3.What payment methods are accepted for NCP502SQ34T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SQ34T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SQ34T2G?
NCP502SQ34T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SQ34T2G 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 NCP502SQ34T2G?
For technical support, including NCP502SQ34T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SQ34T2G requirements.
6.How does Aetrix verify that NCP502SQ34T2G is sourced from the original manufacturer or authorized distributors?
All NCP502SQ34T2G 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 NCP502SQ34T2G meets industry standards.
7.What is the process for return or replacement of NCP502SQ34T2G?
All NCP502SQ34T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SQ34T2G, 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 NCP502SQ34T2G part is unused and in its original packaging.
Return procedure for NCP502SQ34T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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