Photodiodes

Photodiodes are used in an array of every day electronic devices such as camera's, smoke detectors, burglar alarms, safety equipment, medical applications, CD players and surveying instruments to name a few.

What is a photodiode?

They are used as light sensors or detectors. When light reaches a photodiode, this is converted to electrical energy in the form of an electric current. The photocurrent that is produced is proportional to the amount of light. Photodiodes can also be known as photosensors, photodetectors and light detectors.

Photonic applications use the photon in the same way as electronic applications use the electron. There is usually a small amount of electric current that flows through these photosensitive devices even when no light (photons) are entering it. This is known as dark current.

What are the different types?

The PN photodiode was the first to be developed, it is not so widely used these days due to their relatively low performance compared to newer technologies.

The PIN photodiode has a wider surface area and allows for more light photons to be collected, as well as having a lower capacitance. It is the most widely used diode today.

Avalanche photodiodes are used in areas where there is low light, it operates under a high reverse bias condition. The higher the reverse voltage, the higher the gain.

Schottky photodiode is based on the schottky diode, or shottky barrier diode. It provides additional functions over others, particularly with regards to high speed and long wavelength detection.

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Description Price Spectrums Detected Wavelength of Peak Sensitivity Package Type Mounting Type Number of Pins Diode Material Minimum Wavelength Detected Maximum Wavelength Detected Typical Fall Time Length Width Height Angle of Half Sensitivity Automotive Standard
RS Stock No. 654-8895
Mfr. Part No.SFH 213 FA
HK$9.796
Each (In a Pack of 5)
units
Infrared 900nm T-1 3/4 Through Hole 2 Si 750nm 1100nm - 5.9mm 5mm 9mm 10 ° -
RS Stock No. 195-697
Mfr. Part No.SFH 203 FA
HK$7.45
Each
units
Infrared 900nm T-1 3/4 Through Hole 2 Si 800nm 1100nm - 5.9mm 5.9mm 9mm 20 ° -
RS Stock No. 912-8564
Mfr. Part No.SFH 213 FA
HK$3.603
Each (In a Bag of 1000)
units
Infrared 900nm - Through Hole 2 Si 750nm 1100nm - 5.9mm 5mm 9mm 10 ° -
RS Stock No. 913-3285
Mfr. Part No.SFH 2701
HK$2.247
Each (On a Reel of 3000)
units
Infrared, Visible Light 820nm Chip LED Surface Mount 2 - 400nm 1050nm - 3.35mm 1.65mm 1.25mm 60 ° -
RS Stock No. 177-6006
Mfr. Part No.SFH 203 P
HK$3.028
Each (On a Tape of 1000)
units
Infrared, Visible Light 850nm - Through Hole 2 Si 400nm 1100nm - 5.9mm 5mm 5mm 75 ° -
RS Stock No. 654-8671
Mfr. Part No.SFH 203 P
HK$10.098
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm T-1 3/4 Through Hole 2 Si 400nm 1100nm - 5.9mm 5mm 5mm 75 ° -
RS Stock No. 168-5312
Mfr. Part No.SFH 206 K
HK$4.244
Each (On a Tape of 1000)
units
Infrared, Visible Light 850nm - Through Hole 2 Si 400nm 1100nm - 5.1mm 4.1mm 6.9mm 60 ° -
RS Stock No. 654-8659
Mfr. Part No.SFH 206 K
HK$12.222
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm T-1 3/4 Through Hole 2 Si 400nm 1100nm - 5.1mm 4.1mm 6.9mm 60 ° -
RS Stock No. 654-8154
Mfr. Part No.SFH 203
HK$6.742
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm T-1 3/4 Through Hole 2 Si 750nm 1100nm - 5.9mm 4.8mm 9mm 20 ° -
RS Stock No. 168-5299
Mfr. Part No.SFH 203
HK$2.39
Each (On a Tape of 1000)
units
Infrared, Visible Light 850nm - Through Hole 2 Si 400nm 1100nm - 5.9mm 4.8mm 9mm 20 ° -
RS Stock No. 912-8318
Mfr. Part No.BPW 34 S-Z
HK$4.25
Each (On a Reel of 1500)
units
Infrared 850nm Smart DIL Surface Mount 2 Si 400nm 1100nm 0.02µs 4.5mm 3.7mm 1.2mm ±60 ° -
RS Stock No. 168-5245
Mfr. Part No.BPW 21
HK$69.899
Each (In a Box of 40)
units
Infrared, Ultraviolet, Visible Light 550nm TO-39 Through Hole 2 Si 350nm 820nm - 9.5mm 9.5mm 3.7mm 55 ° -
RS Stock No. 497-5661
Mfr. Part No.BPW 21
HK$112.52
Each
units
Infrared, Ultraviolet, Visible Light 550nm TO-39 Through Hole 2 Si 350nm 820nm - 9.5mm 9.5mm 3.7mm 55 ° -
RS Stock No. 652-0207
Mfr. Part No.BPW 34 S-Z
HK$10.262
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm DIP Surface Mount 2 Si 400nm 1100nm - 4.5mm 4mm 1.2mm 60 ° -
RS Stock No. 912-8306
Mfr. Part No.BPX 65
HK$30.498
Each (In a Tray of 120)
units
Infrared 850nm TO-18 Through Hole 2 Si 350nm 1100nm 0.012µs - 5.5mm - ±40 ° -
RS Stock No. 654-9034
Mfr. Part No.SFH 235 FA
HK$11.32
Each (In a Pack of 5)
units
Infrared 900nm T-1 3/4 Through Hole 2 Si 740nm 1120nm - 5.1mm 3.1mm 7.2mm 65 ° -
RS Stock No. 497-5251
Mfr. Part No.SFH 2400 FA-Z
HK$8.778
Each (In a Pack of 5)
units
Infrared 900nm DIP Surface Mount 3 Si 750nm 1100nm - 2.1mm 2.7mm 1.05mm 60 ° -
RS Stock No. 168-5425
Mfr. Part No.SFH 2400 FAR
HK$3.945
Each (On a Reel of 2000)
units
Infrared 900nm DIP Surface Mount 3 Si 750nm 1100nm - - - - - -
RS Stock No. 654-8788
Mfr. Part No.SFH 2505
HK$5.586
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm SMR Through Hole 2 Si 400nm 1100nm - 6mm 4.8mm 7.7mm 15 ° -
RS Stock No. 654-8249
Mfr. Part No.SFH 2430-Z
HK$12.054
Each (In a Pack of 5)
units
Infrared, Visible Light 570nm DIP Surface Mount 2 Si 400nm 900nm - 4.5mm 4mm 1.2mm 60 ° -