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onsemi NCV303LSN28T1G
- Part No.:
- NCV303LSN28T1G
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCV303LSN28T1G.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
NCV303LSN28T1G from onsemi is an automotive-grade ultra-low-current voltage detector IC with open-drain active-low reset output, 2.8 V ±3% detection threshold (−40°C to +125°C), 0.5 µA typical quiescent current, and externally programmable delay via capacitor on CD pin. It serves as a precision reset controller in battery-powered microprocessor systems requiring AEC-Q100 compliance and extended runtime.
For engineers reviewing the NCV303LSN28T1G datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, validated pin functions, real-world use cases in automotive power monitoring, and confirmed alternative options for reset supervision in harsh-temperature embedded designs.
Technical Context
The NCV303LSN28T1G implements a precision undervoltage detector with hysteresis (84 mV typ) and an internal N-channel MOSFET switch that discharges an external timing capacitor (CD pin) upon threshold breach. Its open-drain output requires an external pull-up and supports sink currents up to 3.5 mA at VOUT = 0.5 V (Vin = 1.5 V).
It operates across 0.8 V to 10 V input range, features a delay pull-up resistance of 1.0 MΩ (typ) on Pin 5, and maintains detection accuracy over −40°C to +125°C - validated for automotive applications per AEC-Q100. The 'NCV' prefix confirms automotive qualification and PPAP capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 2.8 V nominal, ±3% over −40°C to +125°C - ensures reliable reset assertion during brown-out in automotive ECUs. |
| Quiescent Current | 0.5 µA typical at Vin = 2.8 V - enables multi-year battery life in always-on vehicle modules. |
| Output Type | Open-drain N-channel, active-low - allows flexible voltage-level translation and wired-OR reset bus implementation. |
| Hysteresis | 0.14 V typical - prevents oscillatory reset toggling near threshold during slow-ramping supply recovery. |
| Delay Capacitor Interface | Pin 5 (CD) with 1.0 MΩ internal pull-up - enables user-programmable reset timeout (e.g., 100 ms to 10 s) using standard ceramic capacitors. |
| Operating Voltage Range | 0.8 V to 10 V - supports direct monitoring of Li-ion, 3.3 V, 5 V, and 9 V automotive rails without external regulators. |
| Temperature Range | −40°C to +125°C - qualified for under-hood and transmission-control module environments. |
Pinout & Package
NCV303LSN28T1G is housed in a TSOP-5 (SOT-23-5) package with wettable flanks, optimized for automated optical inspection and high-reliability automotive assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Reset Output | Open-drain N-channel output | Sinks reset signal to GND when Vin < VDET−; requires external pull-up for logic-high state. |
| 2 - Input | Voltage sense input | Monitors supply rail; triggers detection when voltage falls below 2.8 V threshold with hysteresis. |
| 3 - NC | No connect | Internally unconnected; must be left floating or tied to GND per layout best practices. |
| 4 - GND | Ground reference | Primary return path for detector core and output stage; requires low-impedance PCB connection. |
| 5 - CD | Capacitor delay control | Charges/discharges external timing capacitor; sets reset deassertion delay via RC time constant. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 certified with PPAP support - meets OEM requirements for functional safety-critical reset supervision. |
| Ultra-low power consumption | 0.5 µA typical IIN enables integration into always-on domains (e.g., CAN wake-up circuits) without compromising battery budget. |
| Programmable reset timeout | Delay set by external capacitor on Pin 5 - eliminates need for fixed-timing ICs or microcontroller firmware intervention. |
| High-accuracy hysteresis | 0.14 V typical (±0.056 V) - ensures clean, bounce-free reset release after supply recovery. |
| Wide input voltage range | 0.8 V to 10 V operation - supports direct sensing of single-cell LiFePO4, 12 V battery derivatives, and post-regulator rails. |
Applications
| Engine Control Unit (ECU) Power Monitoring | ADAS Camera Module Reset Supervision |
|---|---|
|
Use Scenario: Monitors 5 V supply rail in engine control units during cold cranking, where battery voltage dips to 6–7 V. IC Role / Device Role / Timing Role: Voltage detector and programmable reset generator - asserts reset until supply stabilizes above 2.835 V and holds it for ≥200 ms post-recovery. Use Value: Prevents ECU lockup or corrupted flash writes during transient undervoltage events common in start-stop systems. |
Use Scenario: Ensures clean boot sequence for image sensor SoCs in forward-facing ADAS cameras exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-grade reset supervisor with −40°C to +125°C operation - provides fail-safe reset assertion during thermal cycling-induced supply droop. Use Value: Eliminates field failures caused by marginal reset timing in vision processors operating near thermal limits. |
| Telematics Control Unit (TCU) Battery Backup Detection | Electric Power Steering (EPS) Microcontroller Reset |
|
Use Scenario: Detects main 12 V supply failure and initiates graceful shutdown while enabling backup SRAM retention via supercapacitor. IC Role / Device Role / Timing Role: Low-IQ voltage monitor with open-drain output - triggers backup power switchover circuit before VDD drops below 2.8 V. Use Value: Extends data logging integrity during ignition-off events without draining primary battery. |
Use Scenario: Provides deterministic reset to EPS MCU during rapid 12 V transients caused by load-dump or alternator ripple. IC Role / Device Role / Timing Role: Precision reset controller with 2.8 V threshold and 0.14 V hysteresis - avoids spurious resets during 100 mVpp ripple on switched 12 V rail. Use Value: Meets ISO 16750-2 pulse test requirements for robustness against electrical disturbances in steering systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EC28DBVR | 2.8 V fixed threshold, 0.8 µA IQ, SOT-23-5, no programmable delay - uses internal timer only. | Lacks external capacitor-based delay tuning; suitable only for fixed-time reset needs. | Choose when design requires lowest possible BOM count and delay tolerance > ±20% is acceptable. |
| MAX6373XS28+T | 2.8 V threshold, 1.5 µA IQ, SO-8, integrated 200 ms delay - no external capacitor required. | Fixed delay and larger footprint; not AEC-Q100 qualified. | Prefer for non-automotive industrial controls where space permits and qualification is not mandated. |
Compared with TLV803EC28DBVR and MAX6373XS28+T, the NCV303LSN28T1G uniquely combines automotive qualification, sub-µA quiescent current, and fully programmable delay - making it the only option for AEC-Q100-compliant systems requiring precise, adjustable reset timing in compact SOT-23-5 form factor.
Availability
NCV303LSN28T1G is available at Aetrix Electronics and suitable for automotive ECU power monitoring, ADAS camera module reset supervision, and telematics control unit battery backup detection requiring stable component supply across extended production lifecycles.
Supply support for NCV303LSN28T1G 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 leader focused on energy-efficient innovation for automotive, industrial, cloud, medical, and IoT applications.
The NCV303 series belongs to onsemi's automotive-qualified voltage detector product line, designed specifically for robust, low-power reset supervision in harsh-temperature electronic control units and safety-critical subsystems.
FAQ
What is the detection threshold accuracy of the NCV303LSN28T1G over temperature?
The NCV303LSN28T1G has a nominal detection threshold of 2.8 V with ±3% tolerance over the full −40°C to +125°C operating range, as specified in Table 3 of the datasheet. This accuracy is guaranteed for all voltage options ≥1.2 V and applies to the NCV303LSN28T1G variant specifically - enabling reliable brown-out detection in automotive under-hood environments.
Does the NCV303LSN28T1G require an external pull-up resistor on the reset output?
Yes, the NCV303LSN28T1G features an open-drain N-channel output (Pin 1), which requires an external pull-up resistor to the target logic rail (e.g., 3.3 V or 5 V). The datasheet recommends values between 10 kΩ and 100 kΩ depending on rise time and bus loading requirements - no internal pull-up is present.
How is the reset delay time programmed on the NCV303LSN28T1G?
The reset delay time is programmed using an external capacitor connected between Pin 5 (CD) and GND. The internal 1.0 MΩ (typ) pull-up resistor forms an RC network; delay duration follows tD2 ≈ RD × CD. For example, a 100 nF capacitor yields ~100 ms delay - curves in Figures 30–32 provide exact timing vs. capacitance at 25°C.
Is the NCV303LSN28T1G pin-compatible with other NCP303 variants?
Yes, all NCP303/NCV303 variants in TSOP-5/SOT-23-5 package share identical pinout and footprint. The NCV303LSN28T1G is mechanically and electrically compatible with NCV303LSN30T1G, NCP303LSN27T1G, etc., allowing drop-in replacement when adjusting detection threshold - provided system-level timing and hysteresis requirements remain satisfied.
What is the maximum sink current capability of the NCV303LSN28T1G reset output?
The NCV303LSN28T1G reset output can sink up to 3.5 mA when VOUT = 0.5 V and Vin = 1.5 V (per Table 3, Note 20), and 1.0 mA when VOUT = 0.05 V and Vin = 0.7 V. This supports direct interfacing with most microcontroller reset inputs and small-signal logic gates without additional buffering.
NCV303LSN28T1G 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:
- 2.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCV303LSN28T1G FAQ
1.How can I place an order for NCV303LSN28T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV303LSN28T1G 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 NCV303LSN28T1G reliable?
The price and inventory of NCV303LSN28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV303LSN28T1G is usually 5 days.
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4.How is shipping managed for NCV303LSN28T1G?
NCV303LSN28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV303LSN28T1G 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 NCV303LSN28T1G?
For technical support, including NCV303LSN28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV303LSN28T1G requirements.
6.How does Aetrix verify that NCV303LSN28T1G is sourced from the original manufacturer or authorized distributors?
All NCV303LSN28T1G 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 NCV303LSN28T1G meets industry standards.
7.What is the process for return or replacement of NCV303LSN28T1G?
All NCV303LSN28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCV303LSN28T1G, 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 NCV303LSN28T1G part is unused and in its original packaging.
Return procedure for NCV303LSN28T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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