HCMS-3902 Avago Technologies US Inc., HCMS-3902 Datasheet - Page 16

• Manufacturer Part Number: HCMS-3902
• Description: LED DISPLAY 5X7 4CHAR 3.8MM RED
• Manufacturer: Avago Technologies US Inc.
• Series: HCMS-39xxr

Specifications of HCMS-3902

• Millicandela Rating: *
• Internal Connection: *
• Size / Dimension: *
• Color: Red
• 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: Red
• Luminous Intensity: 128µcd
• No. Of Digits / Alpha: 4
• Display Area Width: 17.78mm
• Display Area Height: 10.16mm
• Number Of Digits: 4
• Illumination Color: Red
• Wavelength: 641 nm
• Operating Voltage: 5.5 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

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 Rθ
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, one ounce copper traces. P
can 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
has very little impact on the power consumption.
Figure 9. Maximum power dissipation per IC versus ambient temperature
16
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
PIXEL
45
50
JA
, Osc cyc or V
55
is 100°C/W. This value is typical
R
60
θ J-A
65
= 100°C/W
70
75
LED
80
. Changing V
85
90
LOGIC
D