HCMS-3972 Avago Technologies US Inc., HCMS-3972 Datasheet - Page 16

• Manufacturer Part Number: HCMS-3972
• Description: LED DISPLAY 5X7 8CHAR 5MM RED
• Manufacturer: Avago Technologies US Inc.
• Series: HCMS-39xxr

Specifications of HCMS-3972

• Display Type: Alphanumeric
• Millicandela Rating: *
• Internal Connection: *
• Size / Dimension: *
• Color: Red
• Configuration: *
• Voltage - Forward (vf) Typ: *
• Package / Case: 26-DIP
• Number Of Digits/alpha: 8
• Digit/alpha Size: 0.20" (5mm)
• Number Of Digits: 8
• Character Size: 2.54 mm x 4.57 mm
• Illumination Color: Red
• Wavelength: 628 nm
• Operating Voltage: 3.3 V
• Operating Current: 10 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 128 ucd
• Power Consumption: 1.532 W
• Viewing Area (w X H): 40.06 mm x 4.57 mm
• Common Pin: None
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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