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onsemi NCV8668ABD250R2G
- Part No.:
- NCV8668ABD250R2G
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV8668ABD250R2G.pdf
- Description:
- IC REG LINEAR 5V 150MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
NCV8668ABD250R2G from onsemi is a 150 mA automotive-grade LDO regulator with integrated window watchdog, reset output, and enable control-designed for microprocessor power management in body control modules and instrument clusters. It delivers 5.0 V ±1.5% output accuracy over −40°C to +125°C, features 38 µA typical quiescent current, supports up to 40 V input, and includes thermal shutdown and current limit protection.
For engineers reviewing the NCV8668ABD250R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 16 ms fast reset delay, 32 ms ignore window timing, 93% VOUT reset threshold, SOIC-14 package with exposed thermal pad compatibility, and AEC-Q100 qualified operation in severe automotive environments.
Technical Context
The NCV8668ABD250R2G implements a dual-mode window watchdog with programmable timing via WM1/WM2 pins-fast mode (tIW = 32 ms, tOW = 32 ms) and slow mode (tIW = 64 ms, tOW = 64 ms)-and generates reset pulses when VOUT drops below 93% of nominal or VIN falls below 3.8 V. Its internal 30 kΩ pull-up on RO enables open-drain reset signaling without external components for 5 V output variants.
This device integrates three critical supervisory functions-reset generation with adjustable delay, window watchdog monitoring of WDI pulse timing, and enable-controlled low-power disable-within a single SOIC-14 package rated for 150°C junction temperature and compliant with AEC-Q100 Grade 1. The regulator maintains stability with 2.2 µF ceramic output capacitance and operates down to 1 µA disable current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1.5% over −40°C to +125°C - ensures stable MCU core voltage under full automotive temperature range |
| Quiescent Current | 38 µA typical at 25°C - enables always-on battery-connected systems with minimal parasitic drain |
| Input Voltage Range | 4.5 V to 40 V DC - supports cold-crank (4.5 V) and load-dump (40 V) transients per ISO 7637-2 |
| Reset Threshold | 93% of VOUT (4.65 V) with 2% hysteresis - provides reliable brown-out detection before MCU malfunction |
| Dropout Voltage | 225 mV max at 100 mA - allows regulation down to VIN = 5.225 V, critical for low-input automotive conditions |
| Watchdog Timing | tIW = 32 ms / tOW = 32 ms (fast mode) - matches typical MCU firmware watchdog timeout requirements |
| Thermal Shutdown | 175°C activation with 25°C hysteresis - protects against sustained overload or poor PCB heatsinking |
Pinout & Package
NCV8668ABD250R2G uses the SOIC-14 package (Case 751A), with pins 2–3 and 4–5/10–12 connected to GND for thermal and electrical integrity. Pin 14 is EN (active-low enable), pin 1 is RO (open-drain reset output), and pins 6–8 configure watchdog behavior via WM2/WM1/WDI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RO) | Reset Output | Open-drain output with internal 30 kΩ pull-up to VOUT; asserts low when VOUT < 4.65 V or VIN < 3.8 V |
| 2,3,4,5,10,11,12 (GND) | Power Ground | Multiple GND connections provide low-impedance return path and thermal conduction to PCB copper area |
| 6 (WM2) | Watchdog Mode Bit 2 | Configures fast/slow/off watchdog mode; logic high selects slow mode (tOW = 64 ms) |
| 7 (WM1) | Watchdog Mode Bit 1 | Combines with WM2 to select reset delay (16/32 ms) and watchdog timing parameters |
| 8 (WDI) | Watchdog Input | Accepts MCU-generated pulses; missing pulse during open window triggers RO low reset |
| 9 (VOUT) | Regulated Output | 5.0 V supply for MCU core/logic; requires ≥2.2 µF ceramic capacitor with ESR < 100 Ω |
| 13 (VIN) | Input Supply | Accepts 4.5–40 V; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin |
| 14 (EN) | Enable Input | Active-low control; drives regulator into 1 µA disable state when pulled low |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements |
| Integrated window watchdog | Programmable fast/slow modes with configurable ignore/open/closed windows - eliminates need for external watchdog IC |
| Reset with adjustable delay | 16 ms fast or 32 ms slow reset assertion after power-up - aligns with MCU boot sequence timing |
| Reverse output current protection | Blocks reverse current flow from VOUT to VIN when disabled - prevents battery drain through load circuits |
| Pb-free SOIC-14 package | RoHS-compliant 751A outline with thermal pad compatibility - supports automated reflow and thermal management |
Applications
| Body Control Module (BCM) | Instrument Cluster |
|---|---|
Use Scenario: Powering microcontroller 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 safe MCU startup and runtime supervision during vehicle ignition cycles. Use Value: Eliminates discrete reset IC and external watchdog timer, reducing BOM count and PCB area while meeting ASIL-B functional safety prerequisites. |
Use Scenario: Supplying display controller, graphics processor, and sensor interface ICs in digital dashboards. IC Role / Device Role / Timing Role: Regulator with precise 5.0 V output and 93% reset threshold - guarantees clean power-up and detects early brown-out before display corruption occurs. Use Value: Maintains system integrity during engine cranking (VIN dip to 4.5 V) and load dump events (VIN surge to 40 V) without reset glitches. |
| Occupant Protection System | Powertrain Control Unit (PCU) |
Use Scenario: Providing regulated 5 V to airbag diagnostic microcontrollers and pyro driver interfaces. IC Role / Device Role / Timing Role: Safety-critical LDO with thermal shutdown and current limit - prevents fault propagation during crash event power surges. Use Value: Withstands 150°C junction temperature and delivers fail-safe reset signaling to airbag ECU upon VOUT deviation >7%. |
Use Scenario: Powering engine control MCU peripherals including knock sensors, fuel injectors, and camshaft position decoders. IC Role / Device Role / Timing Role: High-immunity LDO with 60 dB PSRR at 100 Hz - suppresses alternator ripple and ignition noise from reaching sensitive analog front-ends. Use Value: Enables accurate sensor measurements despite harsh EMI environment, reducing calibration drift and false fault codes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator with watchdog and reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70750PDBVR | 500 mA output, no integrated watchdog or reset - requires external supervisor IC | Lacks window watchdog timing and programmable reset delay; suitable only for non-safety-critical 5 V rail | Select when higher current is needed and supervisory functions are implemented externally |
| MAX6373TTA+T | Dedicated window watchdog with reset, but no LDO - requires separate 5 V regulator | Provides superior watchdog precision (±1.5% timing) but adds system-level complexity and component count | Select when watchdog timing accuracy is prioritized over integration and board space |
Compared with TLV70750PDBVR and MAX6373TTA+T, the NCV8668ABD250R2G uniquely combines 150 mA LDO regulation, AEC-Q100 qualification, programmable window watchdog, and reset generation in one SOIC-14 package-reducing design risk, validation effort, and total cost of ownership for automotive microprocessor power domains.
Availability
NCV8668ABD250R2G is available at Aetrix Electronics and suitable for body control modules, instrument clusters, occupant protection systems, and powertrain ECUs requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for NCV8668ABD250R2G 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCV8668ABD250R2G belongs to onsemi's automotive-qualified LDO regulator family, engineered specifically for microprocessor power and supervision in harsh environments where reliability, low quiescent current, and integrated safety functions are mandatory.
FAQ
What is the reset threshold voltage for NCV8668ABD250R2G?
The NCV8668ABD250R2G has a reset threshold of 93% of its nominal 5.0 V output, equating to 4.65 V, with 2% hysteresis. This means RO goes low when VOUT drops below 4.65 V and returns high only after VOUT rises above 4.75 V. The threshold is guaranteed across −40°C to +125°C and is independent of input voltage variations within the operating range.
Does NCV8668ABD250R2G require an external pull-up resistor on the RO pin?
No, NCV8668ABD250R2G does not require an external pull-up on the RO pin because it includes an internal 30 kΩ pull-up resistor connected to VOUT. This feature is confirmed for the 5.0 V output variant (as indicated by the "50" in the marking code V8668AB50G); the 3.3 V version would require external pull-up, but NCV8668ABD250R2G is a 5 V device.
What watchdog timing modes does NCV8668ABD250R2G support?
The NCV8668ABD250R2G supports fast and slow watchdog modes selected via WM1 and WM2 pins. In fast mode (WM1 = L, WM2 = L), tIW = 32 ms, tOW = 32 ms, and tCW = 32 ms. In slow mode (WM1 = H, WM2 = L), all timings double to 64 ms. These values are fixed per the "AB" configuration in the part number and documented in the ordering table on page 15 of the datasheet.
Can NCV8668ABD250R2G operate with a 2.2 µF ceramic output capacitor?
Yes, NCV8668ABD250R2G is stable with a minimum 2.2 µF ceramic output capacitor having ESR < 100 Ω, as specified in the Electrical Characteristics table and Application Information section. Unlike many LDOs, it does not require a minimum ESR for stability, making it compatible with low-ESR MLCCs commonly used in automotive designs.
Is NCV8668ABD250R2G qualified to AEC-Q100 standards?
Yes, NCV8668ABD250R2G is AEC-Q100 qualified per Grade 1 (−40°C to +125°C ambient), as explicitly stated in the device summary and supported by test data throughout the datasheet-including thermal shutdown at 175°C, ESD ratings per JS-001, and operation up to 150°C junction temperature. This qualification is inherent to the NCV prefix and confirmed in the "Automotive" product line documentation.
NCV8668ABD250R2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 43 µA
- Current - Supply (Max):
- 44 µA
- PSRR:
- 60dB (100Hz)
- Control Features:
- Enable, Reset, Watchdog
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
NCV8668ABD250R2G FAQ
1.How can I place an order for NCV8668ABD250R2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV8668ABD250R2G 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 NCV8668ABD250R2G reliable?
The price and inventory of NCV8668ABD250R2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV8668ABD250R2G is usually 5 days.
3.What payment methods are accepted for NCV8668ABD250R2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV8668ABD250R2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV8668ABD250R2G?
NCV8668ABD250R2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV8668ABD250R2G 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 NCV8668ABD250R2G?
For technical support, including NCV8668ABD250R2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV8668ABD250R2G requirements.
6.How does Aetrix verify that NCV8668ABD250R2G is sourced from the original manufacturer or authorized distributors?
All NCV8668ABD250R2G 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 NCV8668ABD250R2G meets industry standards.
7.What is the process for return or replacement of NCV8668ABD250R2G?
All NCV8668ABD250R2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV8668ABD250R2G, 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 NCV8668ABD250R2G part is unused and in its original packaging.
Return procedure for NCV8668ABD250R2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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