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LED Vf 1.9v is normal?

B

Boki

Jan 1, 1970
0
Hi All,

If LED's Vf is 1.9v, is that normal?

I remember it was about 0.7v, am I right?

Best regards,
Boki.
 
F

Fred Bloggs

Jan 1, 1970
0
If LED's Vf is 1.9v, is that normal?

Yes- even ordinary LEDs hit 2.2V and the high intensity jobs 3.5V-
nothing unusual about 1.9V.
I remember it was about 0.7v, am I right?

No- that is not right, 0.7V is for an ordinary rectifying diode.
 
B

Boki

Jan 1, 1970
0
Fred Bloggs 寫�:
Yes- even ordinary LEDs hit 2.2V and the high intensity jobs 3.5V-
nothing unusual about 1.9V.


No- that is not right, 0.7V is for an ordinary rectifying diode.

Got it, thank you very much!

Best regards,
Boki.
 
P

Pooh Bear

Jan 1, 1970
0
Boki said:
Hi All,

If LED's Vf is 1.9v, is that normal?
Fairly.

I remember it was about 0.7v, am I right?

No. That would be a silicon diode at lowish current.

It depends on forward current. I run most of my leds @ around 3-10 mA
and use a typical figure of 1.3V.

I suggest you look at a data sheet for simple info like this. It's all
there.

Graham
 
J

John Larkin

Jan 1, 1970
0
Hi All,

If LED's Vf is 1.9v, is that normal?

That's reasonable, but it depends on the color. Red is lowest, blue is
highest. Bandgaps and all that.

John
 
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