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onsemi NCV8508DW50R2
- Part No.:
- NCV8508DW50R2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
NCV8508DW50R2.pdf
- Description:
- IC REG LINEAR 5V 250MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
NCV8508DW50R2 from onsemi is a 5.0 V, 250 mA automotive-grade LDO voltage regulator with integrated watchdog, RESET, and Wakeup functions. It delivers ±3.0% output accuracy, 450 mV typical dropout at 150 mA, and 100 µA typical quiescent current. Designed for microprocessor power in severe environments, it supports battery-operated systems and automotive ECUs requiring robust fault detection and low-power sleep management.
For engineers reviewing the NCV8508DW50R2 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, 45 V input tolerance, Kelvin-sense capability, thermal shutdown protection, and resistor-programmable timing for RESET/Wakeup delays.
Technical Context
The NCV8508DW50R2 implements a precision bandgap reference with internal current limiting and thermal shutdown. Its watchdog circuit monitors falling edges on WDI to validate microprocessor activity, while the Delay pin (1.25 V buffered bandgap) sets timing via external RDELAY for RESET delay (52.1 ns/kΩ), Wakeup period (417 ns/kΩ), and RESET-to-Wakeup delay (208 ns/kΩ).
RESET operates independently of VIN down to 1.0 V output and asserts low when VOUT drops >7.0% below nominal or when watchdog pulses are missed. The Wakeup output generates a 50% duty-cycle square wave whose frequency and timing are fully determined by RDELAY, enabling precise system-level power sequencing without additional timing ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±3.0% - stable rail for 5 V logic and MCU core supply with guaranteed regulation across temperature and load. |
| Max Output Current | 250 mA - sufficient to power mid-complexity microcontrollers and peripheral logic without external pass devices. |
| Quiescent Current | 100 µA typ - enables multi-year battery life in always-on automotive modules and remote sensors. |
| Dropout Voltage | 450 mV typ at 150 mA - allows operation from degraded 12 V vehicle batteries (down to ~5.45 V input) while maintaining regulation. |
| Input Voltage Range | -0.3 V to +45 V DC - withstands automotive load dump transients up to 60 V peak, eliminating need for upstream TVS clamping. |
| RESET Threshold | 4.65 V typ (4.50–4.80 V range) - triggers reset before MCU brownout, ensuring deterministic restart at safe VDD margin. |
| Watchdog Input | Falling-edge sensitive, 30–70% VOUT thresholds - immune to noise-induced false triggers while detecting stalled firmware. |
Pinout & Package
NCV8508DW50R2 is packaged in SO-16L (Case 751G), a 16-pin surface-mount package with internally fused leads and Pb-free option. The exposed leadframe enhances thermal performance (RJA = 83°C/W on 1″ pad board) and supports high-reliability automotive mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 12, 13 | GND | Four dedicated ground pins reduce ground bounce and improve noise immunity in noisy automotive environments. |
| 2 | VIN | Main input supply pin rated for 45 V DC - accepts direct connection to vehicle battery or unregulated DC bus. |
| 3 | WDI | CMOS-compatible watchdog input - monitors microcontroller health via falling-edge detection every Wakeup cycle. |
| 4 | VOUT | Regulated 5.0 V output - provides clean power to MCU, sensors, and logic; includes Kelvin Sense (Pin 7) for remote sensing. |
| 5 | Wakeup | CMOS output generating programmable square wave - wakes MCU from sleep mode; timing set by RDELAY. |
| 6 | RESET | Active-low CMOS reset output - asserts during power-up, overtemperature, short-circuit, or watchdog timeout. |
| 7 | Delay | Buffered 1.25 V bandgap reference - drives external RDELAY to define all timing parameters (RESET, Wakeup, delay intervals). |
| 9–11, 14–16 | NC | No-connect pins - electrically isolated; no routing or grounding required per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive Grade 1 (-40°C to +125°C junction), PPAP-capable - meets OEM requirements for ECU power management. |
| Integrated Watchdog & Wakeup | Eliminates need for discrete timing ICs and external RC networks - reduces BOM count and PCB area in space-constrained modules. |
| Kelvin Sense (Pin 7) | Enables remote sensing at load point - compensates for PCB trace IR drop to maintain ±3.0% regulation at MCU VDD pin. |
| 45 V Input Tolerance | Survives ISO 7637-2 Pulse 5a (load dump) without external protection - simplifies front-end design and improves system robustness. |
| Internally Fused Leads | SO-16L package incorporates fusing on GND and VOUT pins - prevents catastrophic failure during sustained overcurrent or short-circuit events. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Sequencing |
|---|---|
|
Use Scenario: Powering 5 V microcontrollers and CAN transceivers in door modules, lighting controllers, and seat control units. IC Role / Device Role / Timing Role: Primary 5 V LDO with integrated watchdog and RESET - ensures MCU reliability during ignition cycling and battery voltage fluctuations. Use Value: 100 µA quiescent current extends battery life during vehicle sleep modes; 45 V tolerance eliminates need for external TVS diodes. |
Use Scenario: Providing regulated 5 V supply and coordinated power-up/reset sequencing for engine management MCUs. IC Role / Device Role / Timing Role: System supervisor IC - generates Wakeup signal to boot MCU, monitors WDI for firmware liveness, and asserts RESET on undervoltage or watchdog timeout. Use Value: Resistor-programmable timing (via RDELAY) enables precise alignment of MCU wake-up and sensor initialization without firmware dependency. |
| Battery-Powered Telematics Unit | Industrial Sensor Node with Sleep/Wake Cycle |
|
Use Scenario: Powering GPS/GSM modules and ARM Cortex-M MCUs in fleet tracking devices operating from 12 V vehicle battery. IC Role / Device Role / Timing Role: Micropower LDO with Wakeup/RESET - manages low-power sleep states and ensures reliable restart after deep sleep or brownout. Use Value: Wakeup output drives MCU interrupt pin directly; RESET holds processor in reset until VOUT stabilizes post-brownout - prevents corrupted memory writes. |
Use Scenario: Supplying 5 V to ultra-low-power microcontrollers and analog sensors in wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Precision voltage regulator with programmable timing - synchronizes sensor sampling, radio transmission, and MCU sleep cycles using single RDELAY. Use Value: 1.25 V Delay pin serves as stable reference for external tracking regulators - enables dual-rail (e.g., 3.3 V + 5 V) generation from one timing resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV8505DW50R2 | Lower IOUT (150 mA), same 5.0 V output, identical SO-16L package and pinout - lacks Wakeup function and uses fixed RESET delay. | Suitable for simpler MCU systems without sleep/wake coordination; not appropriate where Wakeup-driven interrupt architecture is required. | Select NCV8505DW50R2 only if system does not require programmable Wakeup signaling or full watchdog supervision - saves cost where features are unused. |
| TLV70750PDQNR | 5.0 V, 300 mA LDO with 25 µA IQ but no integrated watchdog, RESET, or Wakeup - requires external supervisor IC for equivalent functionality. | Requires separate reset supervisor (e.g., TPS3808) and timing circuitry - increases BOM, layout area, and validation effort versus single-chip solution. | Choose TLV70750PDQNR only when ultra-low quiescent current dominates design priorities and system-level supervision is implemented externally. |
Compared with NCV8505DW50R2, the NCV8508DW50R2 adds critical Wakeup signaling and resistor-programmable timing for advanced power management; compared with TLV70750PDQNR, it integrates supervision functions that would otherwise require ≥3 additional components and complex timing coordination.
Availability
NCV8508DW50R2 is available at Aetrix Electronics and suitable for automotive body electronics, engine control units, and battery-powered telematics requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for NCV8508DW50R2 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 power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The NCV8508DW50R2 belongs to onsemi's automotive-qualified SMART REGULATOR® family, designed specifically for intelligent power management in harsh environments where reliability, functional safety, and integrated supervision are mandatory.
FAQ
What is the maximum input voltage rating for the NCV8508DW50R2?
The NCV8508DW50R2 supports a continuous DC input voltage range of −0.3 V to +45 V. It is also rated to survive transient peaks up to 60 V (e.g., ISO 7637-2 Load Dump Pulse 5a), making it suitable for direct connection to automotive battery rails without external clamping components. This rating is validated across the full operating temperature range.
How does the Wakeup function operate in the NCV8508DW50R2?
The NCV8508DW50R2 generates a continuous square-wave Wakeup signal on Pin 5, with 50% duty cycle and frequency set by RDELAY on Pin 7 (Wakeup Period = 417 ns × RDELAY). Each rising edge interrupts the MCU from sleep mode; the MCU must then issue a watchdog pulse within that cycle to prevent RESET assertion. The NCV8508DW50R2 pulls Wakeup low during any active RESET condition.
Can the NCV8508DW50R2 be used without the external RDELAY resistor?
No - the NCV8508DW50R2 requires an external resistor (RDELAY) between Pin 7 (Delay) and GND to define RESET delay, Wakeup period, and RESET-to-Wakeup timing. Without RDELAY, these functions are undefined and the device will not generate valid Wakeup or RESET signals. Typical values range from 60 kΩ (25 ms Wakeup period) to 240 kΩ (100 ms).
Does the NCV8508DW50R2 support remote voltage sensing?
Yes - the NCV8508DW50R2 includes a dedicated Sense pin (Pin 7, labeled "Sense" in package diagrams) for Kelvin sensing. When used, this pin connects directly to the load-side of the output trace to compensate for PCB resistance drop. If remote sensing is not needed, Sense must be tied to VOUT (Pin 4) as specified in the datasheet to ensure proper regulation.
Is the NCV8508DW50R2 pin-compatible with other variants in the NCV8508 family?
Yes - all NCV8508 variants (e.g., NCV8508DW50G, NCV8508D2T50R4) share identical pinouts across SO-16L, D2PAK-7, and SO-8 EP packages. The NCV8508DW50R2 uses the SO-16L footprint; migration to D2PAK-7 or SO-8 EP requires only PCB layout changes - no schematic modification is needed for basic regulator functionality.
NCV8508DW50R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.9V @ 150mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset, Watchdog
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
NCV8508DW50R2 FAQ
1.How can I place an order for NCV8508DW50R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8508DW50R2 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 NCV8508DW50R2 reliable?
The price and inventory of NCV8508DW50R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8508DW50R2 is usually 5 days.
3.What payment methods are accepted for NCV8508DW50R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8508DW50R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8508DW50R2?
NCV8508DW50R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8508DW50R2 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 NCV8508DW50R2?
For technical support, including NCV8508DW50R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8508DW50R2 requirements.
6.How does Aetrix verify that NCV8508DW50R2 is sourced from the original manufacturer or authorized distributors?
All NCV8508DW50R2 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 NCV8508DW50R2 meets industry standards.
7.What is the process for return or replacement of NCV8508DW50R2?
All NCV8508DW50R2 units undergo pre-shipment inspection (PSI). If there is an issue with NCV8508DW50R2, 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 NCV8508DW50R2 part is unused and in its original packaging.
Return procedure for NCV8508DW50R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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