HAMAMATSU L8506 Datasheet

LED

Infrared LED

L8506

LED emitting collimated light

When an LED is used for optical encoders, it must emit a uniform, small spot light. L8506 is an infrared LED that emits such a light beam
collimated by the combination of an aspheric lens. L8506 uses a non-confined structure chip that does not show an abrupt deterioration often
encountered with some types of confined chips. The structure of L8506 is also designed to have high resistance to cyclic temperature changes so
it copes with tough environmental conditions required for optical encoders used in factories.

Features

l

Collimated light beam

l

Uniform spot light

l

Narrow directivity: ±5˚

l

High-speed response: 40 MHz Typ.

l

High reliability

Applications

l

Optical encoder

l

Optical switch

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

Parameter Symbol Condition Value Unit

Reverse voltage V
Forward current I
Forward current reduction rate - 0.67 mA/°C

Pulse forward current I

Pulse forward current reduction rate
Power dissipation P 150 mW
Operating temperature Topr -30 to +85
Storage temperature Tstg -40 to +100

R

F

Pulse width=10 µs

FP

Duty ratio=1 %

-7mA/°C

5V

80 mA

0.5 A

C

°

C

°

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

Parameter Symbol Condition Min. Typ. Max. Unit

Peak emission wavelength
Spectral half width
Radiant flux
Forward voltage V
Reverse current I
Spot light size *
Cut-off frequency *
*1: Full width at half maximum, measurement distance (from the sensor to the bottom surface of L8506’s base)=10 mm
*2: Frequency at which the light output drops by -3 dB from that at 100 kHz.

1

2

IF=50 mA 840 870 900 nm

p

λ

IF=50 mA - 45 - nm

∆λ

IF=50 mA 3.4 5.8 - mW

e

φ

FIF

=50 mA - 1.6 1.75 V

R

VR=5 V - - 5 µA
IF=30 mA - 4.3 - mm

fc IF=30 mA ± 4 mAp-p 25 40 - MHz

1

Infrared LED L8506

0 0.5 1.0 1.5 2.0

40

20

60

80

100

FORWARD VOLTAGE (V)

FORWARD CURRENT (mA)

(Typ. Ta=25 ˚C)

4.65 ± 0.15

3.7 ± 0.2

5.3 ± 0.313.5 ± 1.0

5.4 ± 0.2

(0.4)0.6 MAX.

2.54 ± 0.2

0.45
LEAD

■ Directivity ■ Forward current vs. forward voltage

20˚ 10˚ 0˚ 10˚ 20˚

30˚

(Typ. Ta=25 ˚C)

100 %

30˚

80 %

40˚

50˚

60˚

70˚

80˚

90˚

RELATIVE RADIANT OUTPUT (%)

60 %

40 %

20 %

40˚

50˚

60˚

70˚

80˚

90˚

KLEDB0226EA

■ Radiant output vs. ambient temperature

+2

+1

0

-1

-2

RELATIVE RADIANT OUTPUT (dB)

-3
0 20 40 60 80 100

AMBIENT TEMPERATURE (˚C)

100

80

(Typ. IF=50 mA)

KLEDB0228EA

L=5 mm

L=10 mm

KLEDB0227EA

■ Allowable forward current vs. ambient temperature

(Typ.)

100

80

60

40

20

RELATIVE ALLOWABLE FORWARD CURRENT (%)

0

-40 -20 0 20

AMBIENT TEMPERATURE (˚C)

40 60 80 100

KLEDB0229EB

■ Dimensional outline (unit: mm)■ Relative light intensity distribution

IMAGE
SENSOR

L=20 mm

4

KLEDB0230EA

Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions.
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2002 Hamamatsu Photonics K.K.

60

40

20

RELATIVE RADIANT OUTPUT (%)

0

-4 -3 -2 -1 0 2 31

POSITION ON IMAGE SENSOR (mm)

HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Hamamatsu City, 435-8558 Japan, Telephone: [phone], Fax: [phone], http://www.hamamatsu.com

U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: [phone], Fax: [phone]
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: [phone], Fax: [phone]
France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: [phone], Fax: [phone]
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: [phone], Fax: [phone]
North Europe: Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171 41 Solna, Sweden, Telephone: [phone], Fax: [phone]
Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: [phone], Fax: [phone]

2

LED

L

KLEDA0072EC

Cat. No. KLED1035E02
Feb. 2002 DN