BCR421UW6Q Datasheet, PDF (4/11 Pages) Diodes Incorporated – Linear LED Constant Current Regulator in SOT26

Typical Thermal Characteristics (@TA = +25°C, unless otherwise specified.)
BCR421UW6Q
1.4
1.2
1.0
50mm * 50mm
1oz Cu
0.8
0.6
0.4
25mm * 25mm
1oz Cu
0.2
0.0
0
50
100
150
Temperature (°C)
Derating Curve
125
100
T =25°C
amb
50mm * 50mm
1oz Cu
75 _D=0.5
50
D=0.2
Single Pulse
25
D=0.05
D=0.1
0
100µ 1m 10m 100m 1
10 100 1k
Pulse Width (s)
Transient Thermal Impedance
150
125
T =25°C
amb
25mm * 25mm
100
1oz Cu
D=0.5
75
50 ^D=0.2
Single Pulse
25
D=0.05
D=0.1
0
100µ 1m 10m 100m 1
10 100 1k
Pulse Width (s)
Transient Thermal Impedance
800
700
600
500
400
300
200
100
0
100
1000
Copper Area (mm²)
Rth(JA) VS Cu Area
10
T =25°C
amb
Single Pulse
50mm * 50mm
1oz Cu
1
100µ 1m 10m 100m 1 10 100 1k
Pulse Width (s)
Pulse Power Dissipation
10
T =25°C
Single Pulse
amb
25mm * 25mm
1oz Cu
1
100µ 1m 10m 100m 1 10 100 1k
Pulse Width (s)
Pulse Power Dissipation
BCR421UW6Q
Document number: DS38302 Rev. 1 - 2
4 of 11
www.diodes.com
October 2015
© Diodes Incorporated