MDxxx
Series Product Page
Although traditional CRT (Cathode Ray Tube) displays have lost ground
in recent years to flat screen displays based on LCD (Liquid Crystal
Display) or PDP (Plasma Display Panel) technologies, CRT technology
continues to offer the best trade-off between picture quality and
cost. ST’s new MDx family of high voltage power bipolar transistors
is specifically designed to meet the challenging requirements for
horizontal deflection in slim CRT displays.
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Because these new displays employ picture tubes of
significantly reduced depth, the angle through which the electron
beam must be deflected during each horizontal scan has increased
from 110° to typically 124°. This obviously places stringent
new demands on the bipolar power transistors that control the flow
of current through the horizontal deflection coils.
To meet this requirement, the MDx devices are built with the EHVS1
state-of-the-art technology.
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EHVS1 Technology
And Features |
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EHVS1 is a planar technology realized by a float-zone collector
on a diffused substrate, with a redesigned high voltage edge structure.
The silicon efficiency has been improved thanks to the reduction
of the capacitance in the base-collector junction by adopting a
special deep-base process.
As a result, MD devices offer:
Both high current capability and high switching speed
A wider range of optimum drive conditions
A reduced saturation voltage at high current
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Major benefits for MD products are:
Tighter hFE range
Improved R.B.S.O.A. for safer switching performance
Reliable very high-voltage breakdown
Very low leakage current
Low power dissipation
Cool working temperature
Stable thermal performance vs driving variation
Better compatibility for easy replacement
Part Numbering Description |
MDxxx series nomenclature
MD Series Product
Range In TO-3PF |
Part
number
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Diode
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VCES
[V]
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IC
[A]
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Target use
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1500
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6
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up to 21" |
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10
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up to
29" |
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12
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up to
32"
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14
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up to 36" |
N.B. These parts are also available in TO-220FH, identified
by last digit H,
instead of X (i.e. MD2103DFH)
Besides being primarily aimed at horizontal deflection in slim CRT
displays, both MD1802FX/– FH part numbers are also very cost
effective in TV power supply applications (RCC topology). They are
suitable for TVs with screen sizes in the range 14” to 25”.
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