LN78资料

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1Infrared Light Emitting Diodes

R0.612

R1.22-0.45±0.152-1.2±

0.31.22.9±0.254.5±0.3

3.9±0.3

12.8 min.Not soldered

2.4

2.81.51.7±0.20.90.8ø2.4

1: Cathode2: AnodeUnit : mm

2.540.45±0.15LN78

GaAlAs Infrared Light Emitting Diode

For optical control cystems

Absolute Maximum Ratings (Ta = 25˚C)

ParameterSymbolRatingsUnit

Power dissipationPD180mW

Forward current (DC)IF100mA

Pulse forward currentIFP*1A

Reverse voltage (DC)VR3V

Operating ambient temperatureTopr–25 to+85˚C

Storage temperatureTstg–30 to +100˚C* f = 100 Hz, Duty cycle = 0.1 % Features

High-power output, high-efficiency : PO = 10 mW (typ.)

High-speed modulation capability : fC = 12 MHz

Electro-Optical Characteristics (Ta = 25˚C)

ParameterSymbolConditionsmintypmaxUnitRadiant powerPOIF = 50mA610mW

Peak emission wavelengthλPIF = 50mA880nm

Spectral half band width∆λIF = 50mA50nm

Forward voltage (DC)VFIF = 100mA1.51.8V

Reverse current (DC)IRVR = 3V10µA

Capacitance between pinsCtVR = 0V, f = 1MHz50pF

Half-power angleθThe angle in which radiant intencity is 50%40deg.

Cutoff frequencyfC*IFP = 50mA + 10mAp-p12MHz

* Frequency when modulation optical power decreases by 3dB from 1MHz.(10 log PO(fCMHz) = – 3) PO(1MHz)元器件交易网www.cecb2b.com2Infrared Light Emitting DiodesLN78

IF — Ta

120

100

80

60

40

20

Ambient temperature Ta (˚C )Allowable forward current IF (mA)

0204060801000– 25IFP — Duty cycle

10 2

10

1

10 –1

Duty cycle (%)Pulse forward current IFP (A)

11010 210 –210 –1IFP — VF10 4

10 3

10 2

10

1

Forward voltage VF (V)Pulse forward current IFP (mA)

1352410 –10tw = 10µsf = 100HzTa = 25˚C

∆PO — Ta

10

1

Ambient temperature Ta (˚C )IF = 50mA

Relative radiant power ∆PO

– 400408010 –1

λP — Ta

920

900

880

860

840

820

Ambient temperature Ta (˚C )IF = 50mA

Peak emission wavelength λP (nm)

– 4004080120Spectral characteristics

100

80

60

40

20

Wavelength λ (nm)Relative radiant intensity (%)

800850900950100010500750IF = 50mATa = 25˚C∆PO — IFP10 2

10

1

10 –1

Pulse forward current IFP (mA)Relative radiant power ∆PO

10 21010 –210 3(1) tw = 10µs f = 100Hz(2) DC Ta = 25˚C

12.2

1.8

1.4

1.0

0.6VF — Ta

Ambient temperature Ta (˚C )Forward voltage VF (V)

– 4004080120

0˚10˚20˚

30˚

40˚

50˚

60˚70˚80˚90˚Directivity characteristics

2090100

807060504030Relative radiant intensity(%)IF = 100mA

50mA(1)

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