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HomeProductsPower Supplies - (Board Mount)DC DC ConvertersVI-26W-IY
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VI-26W-IY - Vicor Corporation

Manufacturer Part Number
VI-26W-IY
Manufacturer
Vicor
Allelco Part Number
98D-VI-26W-IY
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
28,382 pcs available, New & Original
Parts Description
DC DC CONVERTER 5.5V 50W
Package
Full Brick
Data sheet
VI-26W-IY.pdf

Environmental Information

Vicor REACH.pdf
RoHs Status
 
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Our certification
In stock: 28382
  • Unit Price: $543.35
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $543.35 $543.35
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

VI-26W-IY Tech Specifications
Vicor Corporation - VI-26W-IY technical specifications, attributes, parameters and parts with similar specifications to Vicor Corporation - VI-26W-IY

Product Attribute Attribute Value
Manufacturer Vicor
Voltage - Output 3 -
Voltage - Output 2 -
Voltage - Output 1 5.5V
Voltage - Isolation 3 kV
Voltage - Input (Min) 200V
Voltage - Input (Max) 400V
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™ (50W)
Power (Watts) 50 W
Product Attribute Attribute Value
Package / Case Full Brick
Package Bulk
Operating Temperature -40°C ~ 85°C
Number of Outputs 1
Mounting Type Through Hole
Features OCP, OTP, OVP, SCP
Efficiency 90%
Current - Output (Max) 9.09A
Base Product Number VI-26W
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 thermal performance characteristics of the VI-26W-IY DC-DC converter when operating at full load in an ambient environment of 85°C, and how does this affect long-term reliability?
At 85°C ambient temperature with continuous 50W output (9.09A at 5.5V), the VI-26W-IY exhibits internal junction temperatures that remain within safe operating limits due to its 90% efficiency rating. The full brick construction and through-hole mounting facilitate heat transfer to the PCB, but derating may be necessary for sustained high-load operation near maximum temperature. Thermal modeling should account for airflow conditions and copper plane area on the secondary side to ensure adequate heat dissipation without exceeding the 85°C case temperature limit.
How does the VI-26W-IY compare to other 50W Vicor modules like the VI-J00 and VI-L00 series in terms of input voltage range and isolation requirements for telecom power systems?
While the VI-26W-IY operates across a 200–400V input range optimized for telecom rectified bus applications, the VI-J00 supports 180–360V while the VI-L00 covers 100–200V—making the VI-26W more suitable for higher input scenarios such as 270VDC or 380VDC systems. All three maintain 3kV isolation, but the VI-26W’s wider input window provides better tolerance to transient surges common in central office environments without requiring additional front-end filtering.
Can the VI-26W-IY be used in parallel configurations to deliver more than 50W total output, and what synchronization or current-sharing mechanisms are supported?
The VI-26W-IY does not support native parallel operation; attempting paralleling without external control circuitry can lead to instability or uneven current distribution. Each module must operate independently unless paired with Vicor’s proprietary FactorOR® platform or external active current-sharing logic. For multi-kilowatt systems, designers typically use multiple isolated outputs from separate converters rather than paralleling single 50W units like the VI-26W-IY.
What derating guidelines should be followed for the VI-26W-IY when deployed in compact enclosures with limited convection cooling?
In sealed or poorly ventilated enclosures where natural convection is insufficient, the VI-26W-IY should be derated by 20–30% below its rated 50W output. This means limiting continuous output to approximately 35–40W (around 6.4–7.3A at 5.5V) to maintain case temperatures well below 85°C. Mounting directly to a metal chassis or using thermal vias under the module significantly improves heat sinking and allows closer adherence to full power ratings in constrained spaces.
Is it feasible to substitute the VI-26W-IY with alternative isolated DC-DC converters from competitors such as RECOM or TDK-Lambda in a legacy design, and what key trade-offs exist?
Substitution is possible but requires careful evaluation of efficiency curves, footprint compatibility, and pinout differences. Competitors like RECOM’s Rxx50Q series offer similar power levels but often have narrower input ranges or lower isolation voltages. The VI-26W-IY’s 90% peak efficiency at 5.5V output and proven reliability in ITE applications make it difficult to fully replace without revisiting system-level losses and EMI budgets. Mechanical integration may also require adapter plates due to differing mounting hole patterns.
How does the VI-26W-IY handle input transients above 400V, and what protection components are recommended at the primary side?
The VI-26W-IY has no built-in protection beyond standard OVP thresholds typically around 420–450V. Transient spikes exceeding these values—common during lightning strikes or inductive switching—can damage the converter. Therefore, it is strongly advised to install transient voltage suppression (TVS) diodes or gas discharge tubes upstream with clamping levels just above 400V to protect the VI-26W-IY. Coordination between TVS response time and converter immunity must be verified through transient testing per IEC 61000-4-5 standards.
What impact does RoHS non-compliance have on the use of the VI-26W-IY in commercial equipment targeting EU markets?
Although the VI-26W-IY carries RoHS non-compliant status, it remains acceptable for many ITE applications outside the European Union if end products comply with local regulations. However, projects destined for the EU market must either source RoHS-compliant alternatives or demonstrate exemption eligibility under Annex III (e.g., lead in high melting temperature alloy). This limitation affects supply chain planning and may increase sourcing lead times for compliant variants.
How does the 3kV isolation voltage of the VI-26W-IY perform under repeated surge stress, and what field failure data exists regarding insulation breakdown?
The 3kV RMS isolation specification assumes proper creepage and clearance distances in the host PCB layout. Under repeated surge events (e.g., ±2kV IEC 61000-4-5 tests), minor degradation in insulation resistance may occur over time, especially if contamination or moisture infiltrates the interface gap. Field failures rarely show direct short circuits but often manifest as intermittent leakage currents increasing beyond 1μA. Designers should maintain minimum 8mm PCB spacing between primary and secondary sides to preserve isolation integrity throughout product lifecycle.
What is the typical hold-up time behavior of the VI-26W-IY after input disconnection, and how does this affect system sequencing in telecom racks?
The VI-26W-IY lacks active hold-up capacitors on the output; instead, it relies on bulk capacitance in downstream loads for brief continuity during input dropout. Hold-up time is generally less than 10ms, which may be insufficient for graceful shutdown of FPGAs or microcontrollers. To extend transition periods, designers must add sufficient output capacitance (typically >470µF low-ESR electrolytic or polymer caps) to sustain 9.09A until backup power engages or systems initiate safe state protocols.
Does the VI-26W-IY support remote ON/OFF functionality, and how does this integrate with system monitoring in intelligent power architectures?
Yes, the VI-26W-IY includes a remote sense enable pin that allows software-controlled activation via a microcontroller GPIO or supervisory IC. When grounded, the module shuts down; when left floating or pulled high, it operates normally. This feature integrates seamlessly with digital power managers in modern telecom platforms, enabling dynamic load shedding and fault isolation without interrupting adjacent rails.
What are the implications of the "Bulk" packaging format for procurement and inventory management of the VI-26W-IY in production volumes?
Bulk packaging simplifies handling during automated assembly but complicates manual inspection and kitting. It also reduces per-unit cost compared to tray or tube formats, benefiting high-volume manufacturers. However, it increases risk of electrostatic discharge (ESD) damage if not handled in ESD-safe environments. Suppliers often provide bulk quantities in anti-static bags, but customers must implement proper stencils and placement equipment to avoid misalignment during reflow soldering.
How do the operating temperature limits (-40°C to 85°C) of the VI-26W-IY influence derating strategies in automotive versus industrial applications?
In industrial settings with stable thermal environments, the full 85°C upper limit can be utilized effectively. However, in automotive-grade designs where ambient temperatures may briefly exceed 85°C (e.g., engine bay installations), additional derating is mandatory—typically reducing output power by 15–20%. Conversely, at -40°C cold starts, efficiency dips slightly due to semiconductor behavior, but the VI-26W-IY maintains regulation down to this temperature, unlike some ceramic-based regulators. Always validate startup performance under worst-case cold soak conditions.
What are the expected MTBF figures for the VI-26W-IY based on Telcordia or MIL-HDBK-217F models, and how reliable is it for five-nines uptime requirements?
Using Telcordia SR-332 Issue 5 assumptions for ITE equipment at 25°C base temperature, the VI-26W-IY achieves an estimated MTBF exceeding 1 million hours—equivalent to over 114 years of continuous operation. While this supports high-reliability deployments, achieving “five nines” (99.999%) uptime still depends heavily on redundancy architecture, input conditioning, and environmental controls. The component itself contributes significantly to system availability but cannot compensate for poor thermal design or inadequate protection circuits.
Are there any known issues with solder joint fatigue on the VI-26W-IY due to coefficient of thermal expansion (CTE) mismatch, particularly in high-vibration environments?
The full brick package of the VI-26W-IY experiences higher CTE mismatch stress than smaller modules, making solder joints near corners susceptible to cracking under thermal cycling or mechanical shock. Vibration-prone applications (e.g., avionics or transportation) should consider conformal coating or mechanical strain relief brackets. Alternatively, selecting surface-mount versions with flexible termination layers (like Vicor’s newer ChiP packages) offers improved robustness, though not available for this specific model.
What is the typical efficiency curve profile of the VI-26W-IY across varying input voltages (200–400V), and how does this affect overall system power budgeting?
Efficiency peaks near mid-input range (~300–350V) at approximately 90%, then declines slightly toward both ends—dropping to about 87% at 200V and 86% at 400V due to increased conduction losses. This asymmetry matters in systems where input voltage varies widely (e.g., battery-powered telecom gear transitioning between rectified mains and backup sources). Accurate system-level efficiency calculations must weight average input conditions rather than assuming peak values across all operating points.
How does the VI-26W-IY interact with EMI filters at the input stage, and what are the recommended decoupling capacitor values for stable operation?
The VI-26W-IY generates conducted emissions primarily in the 100kHz–1MHz range due to its resonant transformer topology. A simple π-filter (10µH + two 100nF X7R caps) placed close to the input pins typically suffices for EN 55032 compliance. Input bypassing should use low-ESL capacitors rated for 400V DC, with one near the pin (100nF) and another larger bank (≥10µF) further upstream to dampen low-frequency ripple. Avoid tantalum capacitors due to surge vulnerability.
What modifications would be required to adapt the VI-26W-IY for negative voltage output applications, and are there alternative models better suited for such needs?
The VI-26W-IY delivers only positive 5.5V output; converting it to negative polarity would require post-regulation with a buck-boost inverter or charge pump, introducing complexity and loss. Instead, Vicor offers models like the VI-26W-IZ (with negative output option) that maintain the same footprint and pinout while delivering -5.5V. Replacing the VI-26W-IY with such a variant simplifies design, improves efficiency, and preserves thermal and electrical characteristics without external workarounds.
How does the absence of remote sensing terminals on the VI-26W-IY affect voltage accuracy over long PCB traces in distributed power systems?
Without remote sense capability, the VI-26W-IY regulates output at its own terminals, so voltage drop across trace resistance (e.g., 50mΩ per side) causes significant deviation at the load. For example, 9A × 0.1Ω = 0.9V drop results in a 16% error at 5.5V. This makes the VI-26W-IY unsuitable for loads located far from the converter unless trace impedances are minimized or output capacitance is increased—both of which compromise transient response and EMI performance.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vicor Corporation VI-26W-IY

Product Attribute VI-26W-IY-F3 VI-26W-IY-S VI-26W-IY-F4 VI-26W-IY-F1
Part Number VI-26W-IY-F3 VI-26W-IY-S VI-26W-IY-F4 VI-26W-IY-F1
Manufacturer Vicor Corporation Vicor Corporation Vicor Corporation Vicor Corporation
Current - Output (Max) - - - -
Type - - - -
Applications - - - -
Voltage - Output 1 - - - -
Voltage - Input (Min) - - - -
Number of Outputs - - - -
Size / Dimension - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Efficiency - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Power (Watts) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Isolation - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Input (Max) - - - -
Series - - - -
Voltage - Output 2 - - - -
Features - - - Simultaneous Sampling
Voltage - Output 3 - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

VI-26W-IY Datasheet PDF

Download VI-26W-IY pdf datasheets and Vicor Corporation documentation for VI-26W-IY - 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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VI-26W-IY Image

VI-26W-IY

Vicor Corporation
98D-VI-26W-IY

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