HCMS-3907 Avago Technologies US Inc., HCMS-3907 Datasheet - Page 18

• Manufacturer Part Number: HCMS-3907
• Description: LED DISPLAY 5X7 4CHAR 3.8MM GRN
• Manufacturer: Avago Technologies US Inc.
• Series: HCMS-39xxr

Specifications of HCMS-3907

• Millicandela Rating: *
• Internal Connection: *
• Size / Dimension: *
• Color: Green
• Configuration: *
• Voltage - Forward (vf) Typ: *
• Package / Case: 12-DIP
• Display Type: Alphanumeric
• Number Of Digits/alpha: 4
• Digit/alpha Size: 0.15" (3.8mm)
• Character Format: Dot Matrix
• Character Size: 3.81mm
• Led Color: Green
• Luminous Intensity: 1mcd
• No. Of Digits / Alpha: 4
• Display Area Width: 17.78mm
• Display Area Height: 10.16mm
• Number Of Digits: 4
• Illumination Color: Green
• Wavelength: 574 nm
• Operating Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Common Pin: -
• Lead Free Status / Rohs Status: Details

18
Appendix A. Thermal
Considerations
The display IC has a maximum
junction temperature of 150 C.
The IC junction temperature can
be calculated with Equation 1 in
Table 3.
A typical value for R
W. This value is typical for a
display mounted in a socket and
covered with a plastic filter. The
socket is soldered to a .062 inch
thick PCB with .020-inch wide,
Figure 9. Maximum power dissipation per IC versus ambient temperature.
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
25
30
T
35
A
– AMBIENT TEMPERATURE – °C
40
JA
45
is 100 C/
50
55
R
60
J-A
65
= 100°C/W
70
75
one ounce copper traces. P
be calculated as Equation 2 in
Table 3.
Figure 9 shows how to derate the
power of one IC versus ambient
temperature. Operation at high
ambient temperatures may
require the power per IC to be
reduced. The power consumption
can be reduced by changing the
N, I
Changing V
impact on the power
consumption.
80
PIXEL
85
90
, Osc cyc or V
LOGIC
has very little
LED
.
D
can