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Reliability Data

Mean Time Between Failure (MTBF)

Because operating temperature is one of the most important factors in determining overall module reliability, it is imperative that the user's system design allow for efficient heat transfer from the baseplate to system ambient. Since temperature and failure rate are exponentially related, just a 10°C decrease in baseplate temperature can have a dramatic increase in MTBF. Due to patented zero-voltage/zero-current switching topology, Vicor converters are highly efficient compared to those with more traditional topologies. High efficiency translates into both smaller size and lower temperature rises. To minimize thermal impedance, all major power dissipating components are mounted directly to the baseplate.

Below are representative calculated MTBF values based on MIL-HDBK-217F. If you require information about a specific model, contact Vicor with the model number, expected baseplate temperature, and operating environment to obtain an individually prepared report.

MTBF in 1000 Hours

Part Number Baseplate Temperature G.B. G.F. A.I.C. N.S.
MI-J71-MY 25°C 3,782 1,891 1,135 1,116
50°C 2,307 1,154 692 681
65°C 1,778 889 533 524
MI-274-MW 25°C 3,830 1,878 1,149 1,130
50°C 2,336 1,915 701 689
65°C 1,800 900 540 531
V24C3V3M75BL
Micro Module
25°C 6,235 3,117 1,870 1,839
50°C 3,803 1,902 1,141 1,122
65°C 2,930 1,465 879 864
V24B5M200BL
Mini Module
25°C 4,205 2,102 1,201 1,240
50°C 2,565 1,282 769 757
65°C 1,976 988 593 583
V24A12M400BL
Maxi Module
25°C 3,428 1,714 1,028 845
50°C 2,091 1,282 627 617
65°C 1,611 806 483 475

Environmental Qualification

Fully encapsulated, Vicor Maxi, Mini, Micro, and MI family modules utilize a proprietary spin fill process that assures complete, void free encapsulation making them suitable for the harshest environments. In addition to providing mechanical rigidity, the encapsulant is thermally conductive to eliminate hot spots and aid in heat transfer to the baseplate. Modules are available with temperatures down to -55°C operating and -65°C storage.

To verify the suitability of Vicor's H & M-Grade Maxi, Mini, and Micro as well as MI Family modules for harsh environments, these products have been subjected to the environmental testing requirements of MIL-STD-810, MIL-S-901 and MIL-STD-202. These tests, listed below, are performed at an independent laboratory. Additional environmental tests can be done upon individual customer request.

Environment
MI Family Module
Maxi, Mini & Micro Module

Altitude

  • MIL-STD-810F
    Method 500.4
    Procedure I & II
    40,000 ft.and 70,000 ft. Operational
  • MIL-STD-810D
    Method 500.2
    Procedure III
    explosive decompression (40 K ft.)
  • MIL-STD-810D
    Method 500.2
    Procedure II
    40,000 ft.
    1000 – 1500 ft./min. to
    70,000 ft., unit functioning

Explosive Atmosphere

  • MIL-STD-810F
    Method 511.4
    Procedure I
    Operational
  • MIL-STD-810C
    Method 511.1
    Procedure I

Vibration

  • MIL-STD-810F
    Method 514.5
    Procedure I
    category 14
    sine and random vibration
    per Table 514.5C
    for helicopter AH-6J main rotor
    with overall level of 5.6 g rms
    for 4 hours per axis
  • MIL-STD-810F
    Method 514.5C
    general minimum
    integrity curve
    per Figure 514.5C-17
    with overall level of 7.7 g rms
    for 1 hr per axis
  • MIL-STD-810D
    Method 514.3
    Procedure I
    category 6
    helicopter, 20 g
  • MIL-STD-810D
    Method 514.3
    random:
    10 – 300 Hz @ 0.02 g2/Hz
    2000 Hz @ 0.002 g2/Hz
    3.9 total g rms
    3 hrs/axis
    sine:
    30 Hz @ 20 g
    60 Hz @ 10 g
    90 Hz @ 6.6 g
    120 Hz @ 5.0 g
    16.0 total g rms
    3 axes
  • MIL-STD-810E
    Method 514.4
    Table 514.4-VII
    ±6 db/octave 7.7 g rms
    1hr/axis

Shock

  • MIL-STD-810F
    Method 516.5
    Procedure I
    functional shock, 40 g
  • MIL-S-901D
    lightweight hammer shock
    3 impacts/axis,1, 3, 5 ft.
  • MIL-STD-202F
    Method 213B
    60 g, 9 ms half sine
  • MIL-STD-202F
    Method 213B
    75 g, 11 ms saw tooth shock
  • MIL-STD-810D
    Method 516.3
    Procedure I
    functional shock, 40 g
  • MIL-STD-202F
    Method 213B
    18 pulses, 60 g, 9 msec
  • MIL-STD-202F
    Method 213B
    75 g, 11 ms saw tooth shock
  • MIL-STD-202F
    Method 207A
    3 impacts / axis, 1, 3, 5 feet

Acceleration

  • MIL-STD-810F
    Method 513.5
    Procedure II
    Table 513.5-II
    Operational
    2 – 7 g
    6 directions
  • MIL-STD-810D
    Method 513.3
    Procedure II
    Operational test
    9 g for 1 minute
    along 3 mutually
    perpendicular axes

Humidity

  • MIL-STD-810F
    Method 507.4
    95% Relative Humidity
  • MIL-STD-810F
    Method 507.4
    95% Relative Humidity

Solder Test

  • MIL-STD-202G
    Method 208H
    8 hr aging
  • MIL-STD-202G
    Method 208H
    8 hr aging

Fungus

  • MIL-STD-810F
    Method 508.5
  • MIL-STD-810C
    Method 508.1

Salt Fog

  • MIL-STD-810F
    Method 509.4
  • MIL-STD-810C
    Method 509.1

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