HAMAMATSU L7850, L7850-01 Datasheet

LED

Infrared LED

L7850 series

Peak emission wavelength: 1.45 µm

L7850 series is a long wavelength LED using an InGaAs chip. Peak emission occurs at 1.45 µm, making L7850 series ideal for detection of water
content or moisture. L7850-01 has a glass lens window for narrow directivity (beam spread).

Features

l

Peak emission wavelength: 1.45 µm

l

High radiant output power

l

Narrow directivity (L7850-01)

Applications

l

Light source for moisture meter

l

Light source for photosensitive material

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

Parameter Symbol Condition Value Unit

Reverse voltage V
Forward current I
Forward current derating

rate

Pulse forward current I

Pulse forward current
derating rate

Power dissipation P 150 mW
Operating temperature Topr -30 to +85 °C
Storage temperature Tstg -40 to +100 *

*1: L7850 series is guaranteed to resist temperature cycle test of up to 5 cycles.

4

.

- Ta > 25 °C 1.1 mA/°C

Pulse width=10 µs

.2

Duty ratio=1 %

- Ta > 25 °C 13 mA/°C

1V

80 mA

1.0 A



°C

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

Parameter Symbol Condition

Peak emission wavelength
Spectral half width (FWHM)
Radiant flux
Forward voltage V
Pulse forward voltage V
Reverse current I
Cut-off frequency *
*2: Frequency at which the light output drops by -3 dB based on light output at 100 kHz.

L7850 series may be damaged or performance may deteriorate due to static electricity, so use caution when handling.

I.=50 mA 1.4 1.45 1.5 µm

lp

I.=50 mA - 100 150 nm

Dl

I.=50 mA 0.7 1.0 - mW

fe

=50 mA - 1.0 1.5 V

.I.

=1 A - 2 3 V

.2I.

V4=1 V - - 10 µA

4

fc I.=50 mA ± 10 mAp-p 1 3 - MHz

Min. Typ. Max.

L7850/-01

Unit

1

Infrared LED

L7850 series

■ Emission spectrum

100

80

60

40

20

RELATIVE RADIANT OUTPUT (%)

0

1.2 1.3 1.4 1.5 1.6

WAVELENGTH (µm)

■ Directivity

20˚ 10˚ 10˚ 20˚

30˚

40˚

50˚

60˚

70˚

80˚

90˚

RELATIVE RADIANT OUTPUT (%)

L7850-01

100 %

80

%

60

%

40

%

20
%

(Typ. Ta=25 ˚

(Typ. Ta=25 ˚C)

L7850

C,

IF=50 mA)

KLEDB0233EA

30˚

40˚

50˚

60˚

70˚

80˚

90˚

KLEDB0236EA

■ Radiant flux vs. forward current

(Typ. Ta=25 ˚

100

10

1

RADIANT FLUX (mW)

0.1
10 100 1000

FORWARD CURRENT (mA)

C, tw=100 µs, 0.1 %

■ Radiant output vs. ambient

temperature

+3

+2

+1

0

-1

-2

-3

-4

RELATIVE RADIANT OUTPUT (dB)

-5

-40 -20 40 100020 6080

AMBIENT TEMPERATURE (˚C)

(Typ. IF=50 mA)

■ Forward current vs. forward voltage

)

KLEDB0234EA

1000

100

FORWARD CURRENT (mA)

10

0.5 1.5 2.51.0 2.0

(Typ. Ta=25 ˚

FORWARD VOLTAGE (V)

■ Allowable forward current vs.

ambient temperature

100

80

60

40

20

0

RELATIVE ALLOWABLE FORWARD CURRENT (%)

KLEDB0237EA

-40 -20 0 20

AMBIENT TEMPERATURE (˚C)

40 60 80 100

C, tw=100 µs, 0.1 %

(Typ.)

)

KLEDB0235EA

KLEDB0027EB

■ Allowable forward current vs.

duty ratio

10

1

PULSE WIDTH=10 µs

0.1

ALLOWABLE FORWARD CURRENT (A)

0.01

0.01

PULSE WIDTH=100 µs

0.1 1 10 100

DUTY RATIO (%)

(Typ.

Ta=25

PULSE WIDTH=1 µs

˚C)

KLEDB0225EA

■ ■

■ Dimensional outlines (unit: mm)

■ ■

L7850 L7850-01

5.4 ± 0.2

4.7 ± 0.1

GLASS WINDOW

3.0 ± 0.1

3.6 ± 0.2

0.45
LEAD

13.5

0.45
LEAD

2.54 ± 0.2

COMMON TO CASE

KLEDA0071EB KLEDA0074EA

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. ©2001 Hamamatsu Photonics K.K.

COMMON TO CASE

5.4 ± 0.2

4.65 ± 0.1

2.54 ± 0.2

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

5.85 ± 0.213.5

4.5 ± 0.2

Cat. No. KLED1036E01

Dec. 2001 DN