| Red & Green 5 mm LED [message #87823] |
Sun, 15 April 2018 14:04 |
FL152
Messages: 29
Registered: April 2011
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Chancellor |
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NOS Siemens LR5360-DG standard diffused 5 mm red LED measured / calculated values (If = 10 mA) :
If = 10 mA, Uf = 1,605 V , rD = 3,54 Ω
Figure 1: Forward voltage Uf against applied current If for 5 mm red LED LR5360-DG
Figure 2: Dynamic resistance rD vs. applied current If for 5 mm red LED LR5360-DG
Cheap "no name" 5 mm standard diffused green LED measured / calculated values (If = 10 mA) :
If = 10 mA , Uf = 1,98 V , rD = 10,05 Ω
Figure 3: Forward voltage Uf against applied current If for green "no name" 5 mm LED
Figure 4: Dynamic resistance rD vs. applied current for green "no name" 5 mm LED
Measured and calculated values are pretty in line with previously published values for similar LEDs, see for example „Valve Amplifiers 4" by M. Jones, pages 44-45.
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