L8957

Features

Applications

LED

Infrared LED

l Low price

Uses low cost lens

l Optical encoders

l Optical switches

Low cost LED ideal for optical encoders

L8957 is an infrared LED using a low-cost lens and available at a lower price than other products up to now.

1

1

I Absolute maximum ratings (Ta=25 °C, unless otherwise noted)

Parameter

Symbol

Value

Unit

Reverse voltage

5V

Forward current

80

mA

Forward current reduction rate

-

0.67

mA/°C

Pulse forward current

0.5

A

Pulse forward current reduction rate

-

7

mA/°C

Power dissipation

P

150

mW

Operating temperature

Topr

-30 to +85

°C

Storage temperature

Tstg

-40 to +100

°C

I Electrical and optical characteristics (Ta=25 °C)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Peak emission wavelength

840

870

900

nm

Spectral half width

Dl

-

45

-

nm

Radiant flux

3.4

5.8

-

mW

Forward voltage

-

1.6

1.75

V

Reverse current

-

-

5

µA

Bw

4.5

5.0

-

mm

Optical output *

Pe

1.0

2.0

-

mW

fc

25

40

-

MHz

*1: Full width at half maximum, measurement distance (from the image sensor to the bottom surface of L8957’s base)=10 mm

*2: Measurement distance [from the photodiode (active area: f8 mm) to the bottom surface of L8957’s base]=10 mm

*3: Frequency at which the optical output drops by -3 dB from that at 100 kHz.