L9437 is an infrared LED developed for optical encoders. By improving the aspherical lens used with the previous type L8506, we have achieved

an even more highly collimated beam of near infrared light. The lead pin of L9437 has no step piece that is usually formed at the lead base brazed

to the package, thus eliminating the restriction in printed circuit board design.

Features

l Collimated light beam

l Uniform light spot

l Narrow directivity: ±5˚

l High-speed response: 40 MHz Typ.

l High reliability

Applications

l Optical encoder

LED

Infrared LED

LED emitting collimated light for optical encoder

L9437

1

s Absolute maximum ratings (Ta=25

°C, unless otherwise noted)

Parameter

Symbol

Condition

Value

Unit

Reverse voltage

5

V

Forward current

80

mA

Forward current reduction rate

-

0.67

mA/°C

Pulse forward current

Pulse width=10 µs

Duty ratio=1 %

0.5

A

P uls e forw ard current reduction ra te

-

4.2

mA/°C

Power dissipation

P

150

mW

Operating temperature

Topr

-30 to +85

°C

Storage temperature

Tstg

-40 to +100

°C

s Electrical and optical characteristics (Ta=25

°C)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Peak emission wavelength

λp

840

870

900

nm

Spectral half width

∆λ

-

45

-

nm

Pe

1.25

1.6

-

mW

Forward voltage

-

1.5

1.65

V

Reverse current

-

-

5

µA

Bw

4.3

-

mm

fc

25

40

-

MHz

*1: Measured with a photodiode (active area:

φ8 mm) installed 25 mm away from LED stem undersurface.

*2: Full width at half maximum of beam spot measured with an image sensor installed 13 mm away from LED stem undersurface.

*3: Reference value

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