HAMAMATSU L8245 Datasheet

LED

Infrared LED

L8245

Peak emission wavelength: 1.65 µm

L8245 is a long-wavelength infrared LED using an InGaAs chip. The peak emission occurs at a wavelength near the methane gas absorption
band, making L8245 ideal for a light source for methane gas detection.

Features

l

Peak emission wavelength: 1.65 µm

l

High radiant output

Applications

l

Light source for methane gas detection

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

Parameter Symbol Condition Value Unit

Reverse voltage VR Max. 1 V
Forward current I
Forward current decrease rate - 1.1 mA/°C

Pulse forward current I

Pulse forward current decrease rate - 13 mA/°C
Power dissipation P 150 mW
Operating temperature Topr -30 to +85
Storage temperature Tstg -40 to +100 *

*1: Guaranteed to resist temperature cycle test of up to 5 cycles.

F

Pulse width=10 µs

FP

Duty ratio=1 %

80 mA

1.0 A

1

°
°

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 VFIF=50 mA - 1.0 1.5 V
Reverse current I
Cut-off frequency fc IF=50 mA±10 mAp-p, *

*2: Frequency at which the optical output decreases by -3 dB versus a reference output level at 100 kHz.

L8245 may be damaged or performance may deteriorate due to static electricity, so use caution when handling.

IF=50 mA 1.6 1.65 1.7 µm

p

λ

IF=50 mA - 130 - nm

∆λ

IF=50 mA 0.5 0.8 - mW

e

φ

R

VR=1 V - - 10 µA

2

1 3 - MHz

1

■ Emission spectrum ■ Directivity

100

80

60

40

20

RELATIVE RADIANT OUTPUT (%)

0

1.2 1.4 1.6 1.8 2.0

■ Radiant output vs. ambient temperature

+3

+2

+1

0

-1

-2

-3

-4

RELATIVE RADIANT OUTPUT (dB)

-5

-40 -20 0 20 40 60 80 100

AMBIENT TEMPERATURE (˚C)

(Typ. Ta=25 ˚C, IF=50 mA)

WAVELENGTH (µm)

(Typ. IF=50 mA)

KLEDB0222EA

KLEDB0224EA

20˚ 10˚ 0˚ 10˚ 20˚

30˚

40˚

50˚

60˚

70˚

80˚

90˚

RELATIVE RADIANT OUTPUT (%)

■ Allowable forward current vs. ambient temperature

100

80

60

40

20

RELATIVE ALLOWABLE FORWARD CURRENT (%)

0

-40 -20 0 20

■ Dimensional outline (unit: mm)■ Allowable forward current vs. duty ratio

(Typ.

Ta=25

10

PULSE WIDTH=1 µs

1

PULSE WIDTH=10 µs

˚C)

GLASS WINDOW

3.0 ± 0.1

Infrared LED

(Typ. Ta=25 ˚C)

100

%

80 %

60 %

40 %

20 %

40 60 80 100

AMBIENT TEMPERATURE (˚C)

5.4 ± 0.2

4.7 ± 0.1

3.6 ± 0.2

L8245

30˚

40˚

50˚

60˚

70˚

80˚

90˚

KLEDB0223EA

(Typ.)

KLEDB0027EB

PULSE WIDTH=100 µs

0.1

ALLOWABLE FORWARD CURRENT (A)

0.01

0.01

0.1 1 10 100

0.45
LEAD

2.54 ± 0.2

13.5

DUTY RATIO (%)

KLEDB0225EA

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. ©200 2 Hamamatsu Photonics K.K.

COMMON TO CASE

KLEDA0071EA

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

Cat. No. KLED1034E01
Jan. 2002 DN