Datasheet > L8957_07

L8957_07

更新时间： 2024-01-14 09:19:11

品牌	Logo	应用领域
HAMAMATSU		编码器
页数	文件大小	规格书
2页	89K
描述
Low cost LED ideal for optical encoders

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L8957_07 数据手册

L E D

Infrared LED

L8957

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.

Features

Applications

Low price

Uses low cost lens

Optical encoders

Optical switches

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

Parameter

Symbol

Condition

Value

Unit

Reverse voltage

Forward current

Forward current reduction rate

0.67

mA/°C

Pulse width=10 µs

Duty ratio=1 %

Pulse forward current

IFP

0.5

Pulse forward current reduction rate

Power dissipation

Operating temperature

Storage temperature

Topr

Tstg

4.2

150

-30 to +85

-40 to +100

mA/°C

°C

ꢀꢀElectrical and optical characteristics (Ta=25 °C)

Parameter

Peak emission wavelength

Spectral half width

Optical output *¹

Forward voltage

Reverse current

Spot light size *²

Symbol

λp

∆λ

Condition

IF=30 mA

VR=5 V

Min.

840

1.5

Typ.

870

2.1

1.5

Max.

900

1.65

Unit

µA

MHz

Bw IF=30 mA

fc IF=30 mA 4 mAp-p

4.8 *³

5.4

Cut-off frequency *⁴

*1: Measured with a photodiode (active area: φ8 mm) installed 10 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.

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