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onsemi NCP303LSN42T1G
- Part No.:
- NCP303LSN42T1G
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP303LSN42T1G.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,422
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Product details
Overview
NCP303LSN42T1G from onsemi is an ultra-low-quiescent-current voltage detector IC with open-drain active-low reset output, 4.2 V detection threshold (±3% over −40°C to +125°C), externally programmable delay via capacitor on CD pin, and operation from 0.8 V to 10 V supply. It serves as a precision reset controller in battery-powered microprocessor systems requiring extended runtime and reliable power-fail detection.
For engineers reviewing the NCP303LSN42T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.2 V undervoltage threshold accuracy, 0.5 µA typical quiescent current at 0.8 V input, −40°C to +125°C automotive-grade temperature range, and compatibility with external delay capacitors for configurable reset hold time.
Technical Context
The NCP303LSN42T1G integrates a precision bandgap-based voltage detector with hysteresis (VHYS = 0.126 V typ) and a dedicated CD pin that drives an internal N-channel MOSFET to discharge/charge an external capacitor-enabling programmable reset assertion and release delays. Its open-drain output requires an external pull-up for logic-level compatibility.
It operates across a wide input voltage range (0.8–10 V), maintains sub-1 µA supply current below 1 V input, and delivers 1.0–3.5 mA N-channel sink capability at VOUT = 0.5 V and VIN = 1.5 V. The device is AEC-Q100 qualified (NCV prefix variants) and RoHS compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.2 V ±3% over −40°C to +125°C - ensures reliable reset assertion when main supply drops below nominal 4.2 V rail (e.g., Li-ion battery discharge). |
| Quiescent Current | 0.25 µA typ at VIN = 0.7 V - enables multi-year battery life in always-on monitoring applications. |
| Operating Voltage Range | 0.8 V to 10 V - supports direct connection to low-voltage battery rails (e.g., single-cell LiFePO₄) and higher intermediate supplies. |
| Output Type | Open-drain N-channel, active-low - allows flexible pull-up voltage selection (e.g., 1.8 V, 3.3 V, or 5 V) and wired-OR reset bus implementation. |
| Hysteresis | 0.126 V typ - prevents oscillatory reset toggling during slow or noisy supply recovery near threshold. |
| CD Pin Pullup Resistance | 1.0 MΩ typ - sets RC time constant with external capacitor to define precise reset release delay (tD2). |
| Temperature Range | −40°C to +125°C - validated for under-hood automotive, industrial control, and high-reliability embedded systems. |
Pinout & Package
Package: TSOP-5 / SOT-23-5 (Case 483), surface-mount, 5-pin plastic package with 0.95 mm pitch and 1.6 mm × 2.9 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Reset Output (open-drain) | Active-low reset signal; must be pulled up externally; sinks up to 3.5 mA at 0.5 V drop. |
| 2 | Input (VIN) | Main supply voltage sensing node; detects undervoltage condition relative to 4.2 V threshold. |
| 3 | No Connect (N.C.) | Internally unused; must be left floating or grounded per layout best practice (no electrical function). |
| 4 | GND | Analog and digital ground reference; connects to system common return path. |
| 5 | CD (Capacitor Delay) | Controls reset release timing; internal 1 MΩ pullup charges external capacitor after undervoltage recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.25 µA typical at 0.7 V input - minimizes standby power loss in battery-critical designs. |
| Programmable reset release delay | Configurable via external capacitor on CD pin (e.g., 0.1 µF → ~100 ms tD2) - eliminates need for discrete RC timers. |
| High-threshold accuracy | ±3% over full temperature range - ensures consistent reset behavior across environmental extremes. |
| Wide supply voltage operation | 0.8 V to 10 V - supports direct monitoring of primary battery, LDO outputs, or DC-DC converter rails. |
| Automotive qualification | AEC-Q100 qualified (via NCV-series variants); RoHS and Pb-free - suitable for Tier-1 automotive subsystems. |
Applications
| Microprocessor Reset Control | Li-ion Battery Undervoltage Protection |
|---|---|
|
Use Scenario: Monitors 4.2 V nominal battery rail in portable medical device; asserts reset if voltage falls below safe operating level during discharge. IC Role / Device Role / Timing Role: Voltage detector with hysteresis and programmable release delay ensures clean, bounce-free reset signal to ARM Cortex-M4 MCU. Use Value: Prevents MCU lockup or data corruption by guaranteeing minimum 100 ms reset pulse width after battery recovery. |
Use Scenario: Integrated into smart battery pack to disable charging circuit when cell voltage drops below 3.0 V (preventing deep discharge). IC Role / Device Role / Timing Role: Precision 4.2 V threshold detector triggers cutoff logic; CD pin delay avoids false trips during transient load spikes. Use Value: Extends cycle life by enforcing strict low-voltage cutoff while tolerating brief <10 ms dips due to motor startup. |
| Industrial Power-Fail Indicator | Backup Power Switchover Monitor |
|
Use Scenario: Detects AC/DC adapter failure in PLC I/O module; activates LED warning and initiates graceful shutdown sequence. IC Role / Device Role / Timing Role: Active-low open-drain output interfaces directly to optocoupler input; delay capacitor sets 500 ms warning window before shutdown. Use Value: Provides deterministic, user-visible alert prior to brownout-induced firmware crash or EEPROM write corruption. |
Use Scenario: Supervises main 5 V rail and backup supercapacitor in IoT edge gateway; signals switchover readiness to PMIC. IC Role / Device Role / Timing Role: Dual-rail monitoring (via resistor divider) with 4.2 V threshold detects main rail collapse; CD delay synchronizes backup enable timing. Use Value: Ensures zero-gap power continuity by holding reset until backup source stabilizes above 3.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB29DBZR | Fixed 2.93 V threshold, no programmable delay, SOT-23-3 package (3 pins), 0.5 µA IQ | Lacks CD pin delay functionality; suited only for simple reset without timing control | Select when minimal BOM count and fixed threshold suffice; not suitable for NCP303LSN42T1G's 4.2 V or delay requirements |
| MAX6375XR29+T | 2.93 V threshold, built-in 200 ms delay, SOT-23-5, 1.6 µA IQ, no external CD capacitor | Fixed internal delay limits flexibility; higher quiescent current reduces battery life | Choose for drop-in replacement where 200 ms fixed delay is acceptable and 4.2 V threshold is not required |
Compared with TLV803EB29DBZR and MAX6375XR29+T, the NCP303LSN42T1G uniquely combines 4.2 V precision detection, ultra-low 0.25 µA quiescent current, and fully programmable delay-making it optimal for long-life, high-accuracy battery supervision where timing must scale with system requirements.
Availability
NCP303LSN42T1G is available at Aetrix Electronics and suitable for microprocessor reset control, Li-ion battery protection, and industrial power-fail detection requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for NCP303LSN42T1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP303LSN42T1G belongs to onsemi's Voltage Detector Series with Programmable Delay-designed specifically for ultra-low-power reset supervision in portable and automotive systems where extended battery life and robust voltage monitoring are critical.
FAQ
What is the exact detection threshold voltage of the NCP303LSN42T1G?
The NCP303LSN42T1G has a nominal detection threshold of 4.2 V, specified as 4.116 V (min) to 4.284 V (max) at +25°C, and guaranteed within ±3% (i.e., 4.074 V to 4.326 V) over the full −40°C to +125°C operating temperature range. This tolerance ensures reliable reset activation across automotive and industrial environments.
Does the NCP303LSN42T1G require an external pull-up resistor on its reset output?
Yes, the NCP303LSN42T1G features an open-drain N-channel output (Pin 1), which requires an external pull-up resistor to a defined logic voltage (e.g., 3.3 V or 5 V). The value is selected based on rise time and bus loading; typical values range from 10 kΩ to 100 kΩ. Without this resistor, the reset signal cannot achieve a valid high state.
How is the reset release delay programmed on the NCP303LSN42T1G?
The reset release delay (tD2) is programmed using an external capacitor connected between Pin 5 (CD) and GND. The internal 1.0 MΩ (typ) pullup resistor forms an RC network; for example, a 0.1 µF capacitor yields ~100 ms delay. Delay vs. capacitance curves are provided in Figures 30–32 of the datasheet, and temperature variation is characterized in Figure 35.
What is the minimum supply voltage required for the NCP303LSN42T1G to operate correctly?
The NCP303LSN42T1G operates down to 0.8 V input voltage (Pin 2), with functional specifications guaranteed from 0.8 V to 10 V. At 0.7 V input, the device remains powered but may not assert reset reliably; the absolute minimum operating voltage is 0.55 V (typ) at −40°C to +85°C ambient, per Electrical Characteristics Table on page 3.
Is the NCP303LSN42T1G suitable for automotive applications?
While the NCP303LSN42T1G itself is not AEC-Q100 qualified, it belongs to the NCP303 series whose NCV-prefix variants (e.g., NCV303LSN42T1G) are explicitly AEC-Q100 qualified and PPAP capable. For automotive use, specify the NCV version; the NCP303LSN42T1G is rated for −40°C to +125°C and shares identical electrical specs, making it suitable for non-safety-critical automotive subsystems pending qualification alignment.
NCP303LSN42T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP303LSN42T1G FAQ
1.How can I place an order for NCP303LSN42T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP303LSN42T1G 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 NCP303LSN42T1G reliable?
The price and inventory of NCP303LSN42T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP303LSN42T1G is usually 5 days.
3.What payment methods are accepted for NCP303LSN42T1G?
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4.How is shipping managed for NCP303LSN42T1G?
NCP303LSN42T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP303LSN42T1G 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 NCP303LSN42T1G?
For technical support, including NCP303LSN42T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP303LSN42T1G requirements.
6.How does Aetrix verify that NCP303LSN42T1G is sourced from the original manufacturer or authorized distributors?
All NCP303LSN42T1G 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 NCP303LSN42T1G meets industry standards.
7.What is the process for return or replacement of NCP303LSN42T1G?
All NCP303LSN42T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP303LSN42T1G, 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 NCP303LSN42T1G part is unused and in its original packaging.
Return procedure for NCP303LSN42T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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