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HomeProductsPower Supplies - (Board Mount)DC DC ConvertersVI-2NK-CU-F4
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VI-2NK-CU-F4 - Vicor Corporation

Manufacturer Part Number
VI-2NK-CU-F4
Manufacturer
Vicor
Allelco Part Number
98D-VI-2NK-CU-F4
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
37,486 pcs available, New & Original
Parts Description
DC DC CONVERTER 40V 200W
Package
Full Brick
Data sheet
VI-2NK-CU-F4.pdf

Environmental Information

Vicor REACH.pdf
RoHs Status
 
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In stock: 37486

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Specifications

VI-2NK-CU-F4 Tech Specifications
Vicor Corporation - VI-2NK-CU-F4 technical specifications, attributes, parameters and parts with similar specifications to Vicor Corporation - VI-2NK-CU-F4

Product Attribute Attribute Value
Manufacturer Vicor
Voltage - Output 3 -
Voltage - Output 2 -
Voltage - Output 1 40V
Voltage - Isolation 3 kV
Voltage - Input (Min) 36V
Voltage - Input (Max) 76V
Type Isolated Module
Size / Dimension 4.60" L x 1.86" W x 1.05" H (116.8mm x 47.2mm x 26.7mm)
Series VI-200™ (200W)
Power (Watts) 200 W
Product Attribute Attribute Value
Package / Case Full Brick
Package Bulk
Operating Temperature -25°C ~ 85°C
Number of Outputs 1
Mounting Type Through Hole
Features OCP, OTP, OVP, SCP
Efficiency 90%
Current - Output (Max) 5A
Base Product Number VI-2NK
Applications ITE (Commercial)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.40.9580

Frequently Asked Questions(FAQ)

What are the key electrical specifications of the VI-2NK-CU-F4 isolated DC-DC converter for a 200W power supply design?
The VI-2NK-CU-F4 is designed to deliver a continuous output of 40V at up to 5A, providing exactly 200W of regulated power. It accepts an input voltage range from 36V to 76V DC, making it suitable for high-voltage industrial or telecom rails. With an isolation rating of 3 kV, it meets safety standards for noise-sensitive environments. Its efficiency reaches approximately 90%, which minimizes thermal load and improves system reliability in compact enclosures.
How does the VI-2NK-CU-F4 compare to other modules in the VI-200 series when selecting a 40V output solution?
Among the VI-200 series, the VI-2NK-CU-F4 stands out as one of few options that provide a 40V output within the standard full-brick footprint. While some variants offer lower output voltages such as 12V or 24V, the 40V configuration supports applications requiring higher output without multiple stages. Compared to similar-rated modules from competitors, this part maintains competitive efficiency and isolation while leveraging Vicor’s proprietary switching architecture for reduced electromagnetic interference.
What protection features are integrated into the VI-2NK-CU-F4 to ensure robustness in real-world deployments?
The VI-2NK-CU-F4 includes comprehensive protection circuitry: overcurrent protection (OCP) prevents damage during short circuits or overloads; overtemperature protection (OTP) shuts down the unit if junction temperature exceeds safe limits; overvoltage protection (OVP) safeguards downstream equipment from input surges; and short-circuit protection (SCP) adds redundancy against fault conditions. These mechanisms enhance system resilience without requiring external monitoring components.
Can the VI-2NK-CU-F4 be used in commercial-grade ITE equipment operating near its temperature extremes?
Yes, the VI-2NK-CU-F4 operates reliably across a wide ambient temperature range from -25°C to +85°C, aligning with typical ITE (Information Technology Equipment) environmental requirements. At full rated load, derating may be necessary near the upper end of this range due to reduced airflow or elevated ambient temperatures. Proper thermal management—such as adequate convection cooling or heat sinking—is recommended to maintain long-term reliability under sustained operation.
What are the mechanical constraints when integrating the VI-2NK-CU-F4 into a PCB layout?
The module uses a full-brick form factor measuring 116.8mm × 47.2mm × 26.7mm and mounts via through-hole connections. Care must be taken to avoid placing high-frequency traces beneath the component due to potential ground plane discontinuities caused by internal shielding. Thermal vias under the baseplate improve heat transfer to a copper pour on the bottom layer. Mechanical retention should account for vibration susceptibility inherent in modular converters unless supplemented with additional mounting hardware.
Why is RoHS compliance not listed for the VI-2NK-CU-F4 despite widespread industry adoption of green initiatives?
The VI-2NK-CU-F4 is classified as RoHS non-compliant, primarily because certain lead-frame materials or soldering processes used in its construction do not meet current directive thresholds. This does not affect functionality but may preclude use in regions enforcing strict RoHS regulations. Engineers should verify regional requirements before deployment and consider alternative models if compliance is mandatory for their application.
How does the VI-2NK-CU-F4 handle transient response during sudden load changes compared to non-isolated regulators?
Due to its isolated topology and feedback control loop, the VI-2NK-CU-F4 exhibits slower transient response than low-cost non-isolated regulators, typically settling within hundreds of microseconds rather than tens. However, this trade-off ensures superior noise immunity and safety margins critical in distributed power systems. For most ITE applications, this delay is acceptable given the enhanced stability and protection features.
Is the VI-2NK-CU-F4 suitable for use in automotive or industrial environments beyond ITE?
While officially qualified for ITE applications, the VI-2NK-CU-F4 can function in industrial settings with careful attention to temperature cycling and EMI mitigation. Automotive qualification would require additional testing per AEC-Q200 standards, which are not currently met. Therefore, it is better suited for stationary or non-automotive mobile equipment where input transients and ambient conditions remain within specified bounds.
What input filtering considerations apply when using the VI-2NK-CU-F4 with unregulated sources?
Given the wide input range (36–76V), the VI-2NK-CU-F4 inherently tolerates moderate input variations. However, aggressive voltage spikes or ringing from inductive loads may necessitate input capacitors with sufficient ESR and capacitance to dampen oscillations. A combination of bulk electrolytic and ceramic capacitors close to the input pins helps stabilize the bus and prevent false triggering of OVP circuitry during startup or fault recovery.
How does the VI-2NK-CU-F4 achieve 90% efficiency at full load?
The converter employs synchronous rectification and high-frequency switching optimized for the 40V/5A output profile. By minimizing conduction and switching losses through advanced magnetic design and semiconductor selection, it achieves peak efficiency around 90%. This performance level reduces heat dissipation and enables passive cooling in many cases, though heatsinking remains advisable for continuous operation above 70% load in confined spaces.
Can multiple VI-2NK-CU-F4 units be paralleled for higher output current?
No, the VI-2NK-CU-F4 does not support direct parallel operation. Attempting to share load between identical modules risks imbalance due to slight manufacturing variations in output voltage regulation. Instead, designers should use separate output stages or select a higher-current variant if available. Vicor offers specialized paralleling solutions only for specific families like the PRM/VTM combo, not the standard VI-200 series including this model.
What is the significance of the “CU” suffix in the VI-2NK-CU-F4 part number?
In Vicor’s naming convention, the “CU” indicates the connector style and pinout configuration for the module. Specifically, it denotes a universal connector compatible with standard full-brick sockets and headers used across multiple VI-200 series products. This allows interchangeability with other CU-designated units, simplifying inventory and board-level compatibility without rewiring.
Does the VI-2NK-CU-F4 require external snubbers or EMI filters?
The module incorporates internal EMI suppression elements and meets CISPR 22/24 Class B radiated emissions standards when installed per guidelines. However, in sensitive RF environments, external input/output filtering may still be needed. Layout practices—such as minimizing loop areas and proper grounding—are more impactful than adding discrete components for most ITE applications.
How does the VI-2NK-CU-F4 perform under partial load conditions?
Efficiency remains relatively flat across the load spectrum due to constant-frequency PWM control and synchronous rectification. At 50% load (~100W), efficiency typically drops only slightly from peak values, ensuring consistent thermal behavior. Output regulation stays within datasheet specs (±1%) even at light loads, supporting always-on systems common in network infrastructure gear.
Are there any known limitations regarding input reverse polarity protection?
The VI-2NK-CU-F4 lacks built-in reverse-polarity protection. Applying negative voltage to the input terminals can damage internal semiconductors. External diodes or MOSFET-based clamps must be added if there's risk of accidental reversal. This limitation is consistent across the entire VI-200 family and reflects a deliberate trade-off to reduce cost and complexity in well-controlled input environments.
What documentation is recommended for validating a design using the VI-2NK-CU-F4?
Beyond the datasheet, engineers should review Vicor’s application notes on thermal management, layout best practices, and integration examples. Reference designs for telecom and industrial systems demonstrate proper decoupling, grounding, and heatsinking techniques. Simulation tools like Vicor’s PI Architect can help optimize performance margins and predict transient behavior before prototyping.
How does the VI-2NK-CU-F4 compare to newer Vicor models like the BCM or PRM families?
The VI-2NK-CU-F4 belongs to an earlier generation focused on monolithic integration within a single brick. Newer platforms like BCM (Bus Converter Module) or PRM/VTM combos offer greater flexibility, higher power density, and improved thermal characteristics. However, the VI-2NK-CU-F4 remains advantageous where simplicity, proven reliability, and legacy compatibility are prioritized over cutting-edge efficiency or size reduction.
What are the implications of the MSL rating for the VI-2NK-CU-F4?
The VI-2NK-CU-F4 has a Moisture Sensitivity Level (MSL) of Not Applicable, indicating it is not susceptible to moisture-related damage during storage or handling. This simplifies procurement and shelf-life planning, especially in environments with fluctuating humidity. No bake-out procedures or special packaging are required, unlike surface-mount ICs rated MSL 1–3.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vicor Corporation VI-2NK-CU-F4

Product Attribute VI-2NK-CU-F2 VI-2NK-CU-F3 VI-2NK-CU-F1 VI-2NK-CV-F4
Part Number VI-2NK-CU-F2 VI-2NK-CU-F3 VI-2NK-CU-F1 VI-2NK-CV-F4
Manufacturer Vicor Corporation Vicor Corporation Vicor Corporation Vicor Corporation
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Size / Dimension - - - -
Voltage - Isolation - - - -
Number of Outputs - - - -
Voltage - Input (Min) - - - -
Voltage - Output 2 - - - -
Voltage - Output 1 - - - -
Applications - - - -
Voltage - Input (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Efficiency - - - -
Type - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Features - - - Simultaneous Sampling
Power (Watts) - - - -
Voltage - Output 3 - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Output (Max) - - - -

VI-2NK-CU-F4 Datasheet PDF

Download VI-2NK-CU-F4 pdf datasheets and Vicor Corporation documentation for VI-2NK-CU-F4 - Vicor Corporation.

Datasheets
VI/VE-200 Family.pdf
Design Resources
VI-200, VI-J00 Design Guide, Appl Manual.pdf
Environmental Information
Vicor REACH.pdf

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Evaluation: 10 Articles

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    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
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    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
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    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
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    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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VI-2NK-CU-F4 Image

VI-2NK-CU-F4

Vicor Corporation
98D-VI-2NK-CU-F4

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