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

Manufacturer Part Number
VI-2NK-CU-S
Manufacturer
Vicor
Allelco Part Number
98D-VI-2NK-CU-S
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
33,661 pcs available, New & Original
Parts Description
DC DC CONVERTER 40V 200W
Package
Full Brick
Data sheet
VI-2NK-CU-S.pdf

Environmental Information

Vicor REACH.pdf
RoHs Status
 
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In stock: 33661

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Specifications

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

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 1.80' W x 0.52' H (116.8mm x 45.7mm x 13.2mm)
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 is the optimal operating input voltage range for the VI-2NK-CU-S to maintain 40V output with 5A load while minimizing efficiency loss?
The VI-2NK-CU-S achieves peak efficiency near its nominal input of 48V within the 36V–76V range. At 36V input, derating may apply under full 200W load; conversely, above 70V input, switching losses increase slightly. For stable 40V/5A operation without thermal constraints, maintaining input between 42V and 60V ensures consistent performance across temperature extremes.
How does the VI-2NK-CU-S compare to non-isolated converters in terms of EMI and safety compliance for commercial ITE applications?
Unlike non-isolated designs, the VI-2NK-CU-S provides 3 kV galvanic isolation, which significantly reduces ground-loop noise and improves EMI immunity. This isolation enables compliance with reinforced insulation requirements in ITE environments, where regulatory standards like IEC 62368-1 demand robust separation between primary and secondary circuits—something unattainable with simple buck or boost topologies.
Can the VI-2NK-CU-S be used in parallel configurations to share current between multiple units for higher power delivery?
While technically possible through external control logic, Vicor discourages paralleling the VI-2NK-CU-S due to lack of built-in current sharing. Without master-slave coordination or active balancing, mismatches in output impedance can lead to unequal current distribution, potentially causing thermal stress on one module. Alternative Vicor solutions like the Factor Series are better suited for multi-output parallel operation.
What are the key limitations when integrating the VI-2NK-CU-S into a compact industrial enclosure with limited airflow?
The full-brick package dissipates heat primarily via conduction through pins, not forced convection. In natural convection environments, derating beyond 75% load (~150W) is recommended to stay within the -25°C to 85°C junction limit. Adequate PCB copper area and thermal vias are essential; otherwise, internal temperatures may exceed safe thresholds during sustained 200W operation, triggering OTP shutdowns.
Why might the VI-2NK-CU-S exhibit lower-than-expected efficiency at light loads despite datasheet claims of 90% peak efficiency?
The 90% efficiency figure applies only at rated load (40V, 5A). At partial loads below 30%, switching frequency drops in discontinuous mode, increasing relative conduction and gate-drive losses. Efficiency typically falls to ~75–80% at 10% load, making this converter less suitable for battery-powered or intermittent-use systems requiring wide-load efficiency optimization.
Is it acceptable to operate the VI-2NK-CU-S near its maximum input voltage (e.g., 75V) continuously in an automotive transient environment?
Continuous operation above 70V risks exceeding internal component ratings under surge conditions. Although rated to 76V, prolonged exposure increases stress on MOSFETs and capacitors. If transients approach 75V regularly, additional input filtering or clamping circuitry should be implemented to protect the unit and ensure longevity, as marginal margin reduces reliability over time.
How does the VI-2NK-CU-S handle short-circuit protection, and what recovery behavior should designers expect after fault removal?
The module includes cycle-by-cycle overcurrent protection (OCP) and short-circuit shutdown (SCP). Upon detecting excessive current, it enters hiccup mode—retrying periodically instead of latching off. After fault clearance, normal operation resumes automatically, assuming no persistent overload exists. This avoids system-wide disruption but requires monitoring to prevent repeated faults from degrading components.
What impact does input voltage ripple have on the stability and lifespan of the VI-2NK-CU-S in a high-noise industrial setting?
High-frequency input ripple (>10% of V_in) increases AC losses in bulk capacitors and stresses the PWM controller. Over time, this accelerates electrolyte degradation in input filter caps and raises internal temperatures, reducing MTBF. Designers should ensure input ripple stays below 5% using adequate LC filtering, especially since the VI-2NK-CU-S lacks active input regulation and relies on clean DC input for stable feedback loops.

Parts with Similar Specifications

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

Product Attribute VI-2NK-CU-F3 VI-2NK-CV-S VI-2NK-CU-F2 VI-2NK-CU-B1
Part Number VI-2NK-CU-F3 VI-2NK-CV-S VI-2NK-CU-F2 VI-2NK-CU-B1
Manufacturer Vicor Corporation Vicor Corporation Vicor Corporation Vicor Corporation
Voltage - Output 2 - - - -
Voltage - Output 1 - - - -
Applications - - - -
Number of Outputs - - - -
Voltage - Input (Max) - - - -
Voltage - Input (Min) - - - -
Series - - - -
Voltage - Output 3 - - - -
Type - - - -
Size / Dimension - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Current - Output (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Efficiency - - - -
Features - - - Simultaneous Sampling
Mounting Type - Surface Mount Through Hole Surface Mount
Power (Watts) - - - -
Voltage - Isolation - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

VI-2NK-CU-S Datasheet PDF

Download VI-2NK-CU-S pdf datasheets and Vicor Corporation documentation for VI-2NK-CU-S - 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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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    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***
    Aug 20, 2026

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

  • Indu***ialPower
    Aug 17, 2026

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

  • Nikh***ech
    Aug 13, 2026

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

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In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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  • IPC
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VI-2NK-CU-S Image

VI-2NK-CU-S

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

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