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参数资料
型号： HDSP-3906
元件分类： 显示用LED
英文描述： 7 SEG NUMERIC DISPLAY, HIGH EFFICIENCY RED, 18.87 mm
封装： DIP-18
文件页数： 8/9页
文件大小： 490K
代理商： HDSP-3906
dc current (IPEAK MAX/IDC MAX).
Figure 2 presents the maximum
allowed dc current vs. ambient
temperature. Figure 1 is based on
the principle that the peak junc-
tion temperature for pulsed
operation at a specified peak
current, pulse duration and
refresh rate should be the same
as the junction temperature at
maximum DC operation. Refresh
rates of 1 kHz or faster minimize
the pulsed junction heating effect
of the device resulting in the
maximum possible time average
luminous intensity.
The time average luminous inten-
sity can be calculated knowing
the average forward current and
relative efficiency characteristic,
η
|PEAK, of Figure 3. Time average
luminous intensity for a device
case temperature of 25
°C, I
V
(25
°C), is calculated as follows:
IAVG
IV (25°C) = [–––––] [η|PEAK] [IV DATA SHEET]
20 mA
Example: For HDSP-4030 series
η
|PEAK = 1.00 at IPEAK = 100 mA.
For DF = 1/5:
20 mA
IV (25°) = [––––––] [1.00][4.5 mcd]
20 mA
= 4.5 mcd/segment
The time average luminous inten-
sity may be adjusted for operat-
ing junction temperature by the
following exponential equation:
IV (TJ) = IV (25°C) e[k(TJ + 25°C)]
where TJ = TA + PD RθJ-A
Mechanical
These devices are constructed
utilizing a lead frame in a
standard DIP package. The LED
dice are attached directly to the
lead frame. Therefore, the
cathode leads are the direct
thermal and mechanical stress
paths to the LED dice. The
absolute maximum allowed
junction temperature, TJ MAX, is
105
°C. The maximum power
ratings have been established so
that the worst case VF device does
not exceed this limit.
Worst case thermal resistance
pin-to-ambient is 400
°C/W/Seg
when these devices are soldered
into minimum trace width PC
boards. When installed in a PC
board that provides R
θ
PIN-A less
than 400
°C/W/Seg these displays
may be operated at higher
average currents as shown in
Figure 2.
Optical
The radiation pattern for these
devices is approximately Lam-
bertian. The luminous sterance
may be calculated using one of
the two following formulas.
IV(cd)
LV(cd/m2) = ––––––
A(m2)
πI
V(cd)
LV(footlamberts) = –––––––
A(ft2)
Contrast Enhancement
The objective of contrast enhance-
ment is to optimize display
readability. Adequate contrast
enhancement can be achieved in
indoor applications through
luminous contrast techniques.
Luminous contrast is the
observed brightness of the
illuminated segment compared to
the brightness of the surround.
Appropriate wavelength filters
maximize luminous contrast by
reducing the amount of light
reflected from the area around
the display while transmitting
most of the light emitted by the
segment. These filters are
described further in Application
Note 1015.
Chrominance contrast can further
improve display readability.
Chrominance contrast refers to
the color difference between the
illuminated segment and the
surrounding area. These displays
are assembled with a gray package
and untinted encapsulating epoxy
in the segments to improve
chrominance contrast of the ON
segments. Additional contrast
enhancement in bright ambients
may be achieved by using a
neutral density gray filter such as
Panelgraphic Chromafilter Gray
10, or 3M Light Control Film
(louvered film).
Device
K
-553x/-3900
-0.0131/
°C
-4030/-4130/
-0.0112/
°C
-5730/-4200
Area/Seg. Area/Seg.
Device
mm2
in2
-4030
2.5
0.0039
-4130
4.4
0.0068
-553x/-5730
8.8
0.0137
-3900/-4200
14.9
0.0231
8
相关PDF资料
PDF描述
HDSP-4201-0G000 7 SEG NUMERIC DISPLAY, YELLOW, 20.32 mm
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