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

Manufacturer Part Number
VI-2NK-CX
Manufacturer
Vicor
Allelco Part Number
98D-VI-2NK-CX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
35,543 pcs available, New & Original
Parts Description
DC DC CONVERTER 40V 75W
Package
Full Brick
Data sheet
VI-2NK-CX.pdf

Environmental Information

Vicor REACH.pdf
RoHs Status
 
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In stock: 35543

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Specifications

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

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 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
Series VI-200™ (75W)
Power (Watts) 75 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) 1.88A
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)

How does the VI-2NK-CX compare to other 75W isolated DC-DC converters in terms of input voltage tolerance and efficiency, especially when operating near its maximum power rating?
The VI-2NK-CX operates across a wide input range of 36V to 76V, which provides flexibility in systems with varying supply conditions. With an efficiency of 90%, it maintains high performance even under full load—this is competitive among 75W class modules where typical efficiencies range from 87% to 91%. However, at sustained 75W output, thermal management becomes critical due to power dissipation of approximately 8.3W (calculated as 75W / 0.9 - 75W). This places the VI-2NK-CX in the upper tier of efficiency for its class but requires careful PCB layout and heatsinking to maintain junction temperature within the -25°C to 85°C operating range.
What are the key design considerations when integrating the VI-2NK-CX into an ITE commercial application, particularly regarding isolation and safety compliance?
The VI-2NK-CX provides 3 kV of galvanic isolation between input and output, meeting stringent requirements for industrial and information technology equipment (ITE). In commercial designs, this isolation supports functional safety by preventing ground loops and reducing shock hazards. However, because the device is RoHS non-compliant, engineers must verify that lead-based solder or restricted substances do not enter the system through adjacent components or assembly processes. Additionally, the full brick footprint (4.60" x 2.40") demands adequate spacing on the PCB to comply with creepage and clearance standards, especially in high-voltage environments where input transients may occur.
Can the VI-2NK-CX be used in redundant power architectures, and what limitations should be considered regarding its single-output configuration?
While the VI-2NK-CX is designed for primary power conversion in single-output systems, it can support redundancy in conjunction with external diodes or active ORing controllers. Its isolated output enables safe paralleling with other sources, provided reverse current protection is implemented. However, as a single-output module, it cannot natively support multiple rails without additional regulation stages. Engineers must also consider that paralleling increases total output capacitance and may affect transient response due to shared control dynamics, requiring validation under worst-case load steps.
How does the operating temperature range of the VI-2NK-CX influence derating strategies in industrial versus commercial applications?
The VI-2NK-CX operates from -25°C to 85°C, making it suitable for both commercial and industrial environments. However, in industrial settings where ambient temperatures can exceed 50°C, significant derating is often necessary. For example, at 85°C case temperature, continuous output current should be reduced below 1.88A to prevent thermal shutdown. In contrast, commercial applications typically experience lower ambient temperatures, allowing closer-to-rated performance. Thermal modeling using the module’s power loss profile (≈8.3W at full load) helps determine whether forced airflow or conduction cooling is required in enclosure designs.
What protection features does the VI-2NK-CX offer, and how do they impact system reliability in fault-prone environments?
The VI-2NK-CX includes overcurrent protection (OCP), overtemperature protection (OTP), overvoltage protection (OVP), and short-circuit protection (SCP). These mechanisms enhance robustness against load faults, input surges, and thermal overloads common in harsh environments. OVP, for instance, clamps output voltage during transient spikes, protecting downstream circuitry. SCP limits fault current to safe levels, preventing catastrophic failure. However, repeated triggering of these protections—especially OTP—can indicate inadequate cooling or excessive ambient temperature, suggesting a need for system-level thermal review rather than relying solely on the module’s internal safeguards.
Is the VI-2NK-CX compatible with digital control interfaces, and what alternatives exist if remote monitoring is needed?
The VI-2NK-CX is a traditional analog-isolated DC-DC converter without built-in digital communication such as PMBus or CAN. It lacks enable/digital trim pins beyond basic on/off control. Therefore, it does not support real-time telemetry or programmable settings. For applications requiring digital supervision, engineers must pair it with an external microcontroller or dedicated power monitor IC that interfaces with the output voltage and current sense lines. Alternatively, Vicor’s newer VI-HAM series offers digitally managed versions, but the VI-2NK-CX remains limited to fixed 40V output without dynamic adjustment.
How should the VI-2NK-CX be mounted in a high-vibration environment, and what mechanical factors could compromise its long-term reliability?
The VI-2NK-CX uses through-hole mounting, which provides strong mechanical attachment but may loosen over time under vibration. To mitigate this, engineers should use locking washers, adhesive threadlockers on fasteners, and ensure uniform torque distribution across all four mounting holes. The full brick package (116.8mm x 61.0mm) has substantial mass, which can act as a heat sink but may also concentrate stress points if the PCB flexes. Reinforcing the board or using conformal coating can help protect solder joints from fatigue. Moisture sensitivity level (MSL) is not applicable, indicating the component is robust against humidity-induced delamination, but soldering must still follow IPC guidelines to avoid cracks under cyclic loading.
What are the implications of the VI-2NK-CX’s RoHS non-compliance for global market entry, particularly in regions like Europe or California?
Since the VI-2NK-CX is RoHS non-compliant, it cannot be legally distributed in the European Union or other jurisdictions enforcing strict hazardous substance restrictions. Exceptions exist for specific exemptions (e.g., certain lead-based solders in high-reliability electronics), but approval is case-by-case and requires formal documentation. In California, similar regulations apply under SB 254. Engineers selecting this part must confirm that alternative sourcing or redesign is not feasible; otherwise, the entire product line may face regulatory barriers. This limitation often makes the VI-2NK-CX unsuitable for consumer or general commercial products but acceptable in specialized industrial equipment with valid exemptions.
How does the VI-2NK-CX perform in terms of output ripple and noise, and what filtering techniques are recommended for sensitive loads?
While the datasheet does not specify exact ripple values, typical isolated converters in the 75W class exhibit output ripple in the tens of millivolts peak-to-peak at full load. The VI-2NK-CX, with its high efficiency and optimized magnetics, likely falls within this range. For sensitive analog or precision digital loads connected to the 40V rail, local bypass capacitors (e.g., low-ESR ceramic and tantalum combinations) should be placed close to the output terminals. Additionally, a π-filter (LC network) may be necessary if conducted emissions exceed limits, though this adds complexity and cost. Without explicit ripple data, empirical testing under real-world conditions is advisable before finalizing the power delivery architecture.
Can the VI-2NK-CX be used in automotive applications, and what modifications would be required to meet AEC-Q100 standards?
The VI-2NK-CX is not qualified to AEC-Q100 and is listed under ITE (Commercial) applications, indicating it is not intended for automotive environments. Operating temperature extends to 85°C, whereas automotive systems often require operation up to 125°C. Furthermore, automotive-grade converters undergo rigorous stress testing for thermal cycling, humidity resistance, and electromagnetic compatibility that the VI-2NK-CX does not address. Attempting to use it in automotive contexts risks premature failure and voids any potential warranty or liability coverage. For such use cases, a qualified automotive-grade alternative—such as those from Vicor’s Q100-compliant portfolio—should be selected instead.
What are the typical applications where the VI-2NK-CX outperforms discrete solutions, and in what scenarios would it be overkill?
The VI-2NK-CX excels in space-constrained, high-efficiency isolated power systems such as server midplanes, industrial motor drives, and telecom infrastructure where board area is premium and reliability is critical. Its 75W output and 3 kV isolation reduce the need for multiple discrete regulators and opto-isolators, simplifying design and improving transient response. However, in low-power applications (<10W) or non-isolated topologies, a discrete solution may offer better cost and size efficiency. Similarly, if only moderate isolation (e.g., <1 kV) suffices, simpler modules could suffice, making the VI-2NK-CX unnecessarily complex and expensive for marginal gains in robustness.
How does the VI-2NK-CX handle input transients within its 36–76 V range, and what input filtering might be needed for compliance with EN 61000-4 standards?
The VI-2NK-CX is designed to withstand input transients within its specified range, but external filtering is often necessary for immunity to conducted disturbances per EN 61000-4-4 (EFT) and EN 61000-4-5 (surge). A simple RC filter or TVS diode array at the input can suppress fast transients and protect against voltage spikes exceeding 76V. Input capacitance also affects transient response; adding bulk electrolytic and ceramic capacitors near the input connector improves stability during load changes. While the module itself resists normal operational transients, system-level compliance testing may reveal susceptibility, necessitating iterative refinement of input conditioning networks tailored to the installation environment.
What is the expected lifetime and failure mode behavior of the VI-2NK-CX under continuous full-load operation?
Vicor does not publish explicit lifetime figures, but based on ceramic capacitor aging and semiconductor junction stress, the VI-2NK-CX is expected to operate reliably for >1 million hours under controlled conditions. Failure modes typically manifest as open output (due to fuse-like internal protection tripping after OCP or OTP events) rather than gradual degradation. At 75W continuous output, internal temperatures rise significantly, accelerating wear on passive components. Monitoring input current and case temperature during qualification tests provides early indicators of potential drift. Redundancy or periodic health checks are advisable in mission-critical systems where unplanned downtime carries high risk.
How does the VI-2NK-CX compare to the VI-2NK variant in terms of availability and feature set, given they share the same base product number?
The VI-2NK-CX is a specific model within the VI-2NK series, differing primarily in packaging or revision code (“CX” denotes a particular configuration or manufacturing batch). Both share identical electrical characteristics: 40V output, 75W power, 3 kV isolation, and same pinout. However, availability varies by distributor and lifecycle status. The “CX” suffix may indicate an earlier revision, so cross-referencing the latest datasheet and contacting Vicor directly is essential to confirm interchangeability. In most designs, either version functions identically, but firmware or hardware updates in newer revisions might offer subtle improvements in transient response or EMI performance—always validate before substitution.

Parts with Similar Specifications

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

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

VI-2NK-CX Datasheet PDF

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

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    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
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    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.

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

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VI-2NK-CX Image

VI-2NK-CX

Vicor Corporation
98D-VI-2NK-CX

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