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onsemi NCV8518PDR2G
- Part No.:
- NCV8518PDR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
NCV8518PDR2G.pdf
- Description:
- IC REG LDO 5V 0.25A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
NCV8518PDR2G from onsemi is an automotive-grade 5.0 V low-dropout linear regulator with integrated watchdog timer, wake-up signal generator, RESET output, and ENABLE control. It delivers up to 250 mA output current, maintains ±2% output voltage accuracy, and operates across −40°C to +150°C junction temperature. Designed for microprocessor power management in tire pressure monitoring systems and battery-powered automotive modules.
For engineers reviewing the NCV8518PDR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 45 V transient tolerance, <1.0 µA sleep-mode current, adjustable reset/wake-up timing via RDELAY, and AEC-Q100 qualification for under-hood use.
Technical Context
The NCV8518PDR2G integrates a precision bandgap reference, low-quiescent-current LDO pass element, and digital supervision logic-including a watchdog circuit that monitors falling edges on WDI, a programmable reset delay timer, and a periodic wake-up signal generator synchronized to external RDELAY. Its thermal shutdown and short-circuit protection operate autonomously without external components.
RESET assertion occurs under four conditions: power-on reset (POR), output undervoltage (<4.65 V), missing watchdog pulse within one wake-up period, or input UVLO (~4.75 V at 20°C). Wake-up frequency and RESET delay are both set by the same external resistor, enabling coordinated timing with minimal BOM count.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - ensures stable MCU core/peripheral supply across temperature and line/load variations. |
| Max Output Current | 250 mA - supports mid-power automotive MCUs and sensor interfaces without external boost. |
| Dropout Voltage | 425 mV typical at 150 mA - enables regulation down to VIN = 5.425 V, critical for cold-crank operation. |
| Quiescent Current | 100 µA typical at full load; <1.0 µA in shutdown - extends battery life in always-on TPMS nodes. |
| Input Transient Tolerance | 45 V - withstands ISO 7637-2 pulse 5a/b without external clamping, reducing system-level protection cost. |
| Operating Temperature | −40°C to +150°C TJ - qualified for engine compartment and transmission control unit placement. |
| Reset Threshold | 4.65 V nominal - triggers RESET before MCU brown-out, ensuring deterministic recovery behavior. |
Pinout & Package
NCV8518PDR2G uses SOIC-16 wide-body exposed-pad package (Case 751AG), optimized for thermal dissipation in high-ambient automotive environments. The exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJA = 70°C/W on 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Wake Up | CMOS-compatible open-drain output generating periodic interrupt signal to wake MCU from sleep mode. |
| 2–4, 6–7, 10, 12, 14 | NC | No internal connection - must remain unconnected per datasheet; not usable as heatsink or auxiliary pins. |
| 5 | ENABLE | Positive-logic enable input; logic high (>2.0 V) activates regulator, logic low (<0.8 V) disables it with <1.0 µA quiescent draw. |
| 8 | WDI | Watchdog input accepting CMOS-level falling-edge pulses; absence of edge within wake-up period triggers RESET. |
| 9 | VIN | Main input supply pin rated −0.3 V to +45 V - accepts battery, alternator, and load-dump transients directly. |
| 11 | RESET | Active-low CMOS RESET output asserting when VOUT drops below 4.65 V or watchdog fails, with programmable delay. |
| 13 | GND | Power ground reference for all internal circuits and output stage - must connect to low-impedance system ground plane. |
| 15 | Delay | Buffered ~0.48 V reference output used to bias external RDELAY for setting wake-up period and RESET delay timing. |
| 16 | VOUT | Regulated 5.0 V output - supplies MCU, sensors, and logic; requires ≥1.0 µF ceramic output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Watchdog + Wake-Up Generator | Single-resistor programmable timing eliminates need for external timers or clock sources in sleep-wake architectures. |
| AEC-Q100 Qualified | Qualified to Grade 1 (−40°C to +125°C ambient) and Grade 0 (−40°C to +150°C junction), meeting automotive reliability standards. |
| 45 V Transient Immunity | Operates through ISO 7637-2 Pulse 5a (45 V/100 ms) without external TVS, simplifying front-end protection design. |
| Thermal & Short-Circuit Protection | Fully autonomous protection with no external components required - shuts down at 150°C and limits current to 400 mA max. |
| Pb-Free Exposed-Pad SOIC-16 | RoHS-compliant package with enhanced thermal performance (θJB = 12°C/W) for high-power-density automotive PCBs. |
Applications
| Tire Pressure Monitoring System (TPMS) | Battery-Powered Automotive Sensor Node |
|---|---|
|
Use Scenario: Self-powered wheel-mounted sensor module transmitting pressure/temperature data via RF every 1–5 minutes. IC Role / Device Role / Timing Role: Primary 5 V regulator and system supervisor - provides clean power, wakes MCU periodically, validates MCU activity via watchdog, and asserts RESET on fault. Use Value: Enables >10-year battery life via <1.0 µA shutdown current and eliminates need for discrete watchdog IC or reset timer. |
Use Scenario: Under-hood oxygen sensor interface with CAN communication and diagnostic reporting. IC Role / Device Role / Timing Role: Main power regulator and safety monitor - sustains operation during 45 V load dump, detects MCU lockup, and forces controlled restart. Use Value: Meets ASIL-B functional safety requirements via dual independent fault detection paths (watchdog + undervoltage). |
| Engine Control Unit (ECU) Auxiliary Power | Automotive Body Control Module (BCM) |
|
Use Scenario: Secondary 5 V rail powering non-critical peripherals (e.g., fan drivers, solenoid interfaces) in multi-rail ECU designs. IC Role / Device Role / Timing Role: Standby regulator with ENABLE control - powered only during active engine operation, disabled during key-off to prevent battery drain. Use Value: Reduces parasitic draw to <1.0 µA in key-off state while maintaining fast wake-up capability via integrated wake-up signal. |
Use Scenario: Centralized lighting and door-lock controller requiring reliable power sequencing and brown-out immunity. IC Role / Device Role / Timing Role: Supervisory regulator - generates POR delay, monitors main 12 V rail integrity, and coordinates wake-up of sub-systems after ignition-on. Use Value: Eliminates need for separate POR generator, reset supervisor, and wake-up oscillator, reducing BOM count by 3–4 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO regulator with supervision functions applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70750PDPWR | 5.0 V fixed output, 300 mA, but lacks watchdog, wake-up, and RESET - only basic LDO with enable. | Suitable for simple power rails where supervision is handled externally or not required. | Select only if supervision features are implemented elsewhere; NCV8518PDR2G reduces system complexity where integrated supervision is needed. |
| MAX16126ATP+T | 5.0 V LDO with RESET and watchdog, but rated only to +125°C TJ and not AEC-Q100 qualified. | Limited to cabin or non-under-hood automotive applications; not validated for engine bay deployment. | Choose NCV8518PDR2G for under-hood use requiring full AEC-Q100 Grade 0 qualification and 150°C operation. |
Compared with TLV70750PDPWR and MAX16126ATP+T, the NCV8518PDR2G uniquely combines AEC-Q100 Grade 0 qualification, 45 V transient tolerance, and fully integrated watchdog/wake-up/RESET in a single SOIC-16 package - eliminating external timing components and enabling robust, compact automotive subsystem designs.
Availability
NCV8518PDR2G is available at Aetrix Electronics and suitable for tire pressure monitoring systems, battery-powered automotive sensor nodes, and engine control unit auxiliary power rails requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for NCV8518PDR2G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCV8518PDR2G belongs to onsemi's automotive power management portfolio, designed specifically to simplify microprocessor power and supervision in harsh-environment vehicle systems - reducing design risk and accelerating time-to-market for ASIL-compliant ECUs.
FAQ
What is the maximum input voltage the NCV8518PDR2G can withstand without damage?
The NCV8518PDR2G has a maximum input voltage rating of 45 V, allowing it to survive ISO 7637-2 load-dump transients common in automotive 12 V systems. This rating applies to both continuous operation and transient events, and no external clamping is required for compliance with standard automotive surge tests.
How does the NCV8518PDR2G generate its wake-up signal and what sets its frequency?
The NCV8518PDR2G generates a periodic wake-up signal using an internal oscillator biased by the external resistor RDELAY connected to the Delay pin. With RDELAY = 60 kΩ, the wake-up period is 25 ms (40 Hz); increasing RDELAY to 120 kΩ doubles the period to 50 ms. The signal is a 5 V square wave with 50% duty cycle referenced to VOUT.
Does the NCV8518PDR2G require external capacitors, and if so, what are the minimum values?
Yes, the NCV8518PDR2G requires a minimum 1.0 µF ceramic output capacitor (C2) between VOUT and GND for stability, as specified in the application circuit. An additional 0.1 µF capacitor is recommended on the RESET output. Input capacitance (C1) is optional but advised if the regulator is located >2 cm from the main power filter.
What happens to the NCV8518PDR2G outputs when the ENABLE pin is pulled low?
When ENABLE is pulled below 0.8 V, the NCV8518PDR2G enters shutdown mode: the pass transistor turns off, VOUT drops to 0 V, RESET goes high-impedance (not actively driven), Wake Up stops toggling, and total quiescent current falls below 1.0 µA. All internal supervision circuits remain inactive until ENABLE rises above 2.0 V.
Is the NCV8518PDR2G pin-compatible with other devices in the NCV8518 family?
No - the NCV8518PDR2G (SOIC-16) is not pin-compatible with the SOIC-8 variant (e.g., NCV8518PDG). Pin counts, pin functions, and layout differ significantly: SOIC-16 includes dedicated Wake Up and Delay pins, while SOIC-8 consolidates functions and omits Wake Up. Board redesign is required when switching between packages.
NCV8518PDR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
NCV8518PDR2G FAQ
1.How can I place an order for NCV8518PDR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8518PDR2G 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 NCV8518PDR2G reliable?
The price and inventory of NCV8518PDR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8518PDR2G is usually 5 days.
3.What payment methods are accepted for NCV8518PDR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8518PDR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8518PDR2G?
NCV8518PDR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8518PDR2G 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 NCV8518PDR2G?
For technical support, including NCV8518PDR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8518PDR2G requirements.
6.How does Aetrix verify that NCV8518PDR2G is sourced from the original manufacturer or authorized distributors?
All NCV8518PDR2G 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 NCV8518PDR2G meets industry standards.
7.What is the process for return or replacement of NCV8518PDR2G?
All NCV8518PDR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8518PDR2G, 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 NCV8518PDR2G part is unused and in its original packaging.
Return procedure for NCV8518PDR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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