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 Spectral Range of Sensitivity Diode Material Minimum Wavelength Detected Maximum Wavelength Detected Typical Fall Time Length Width Height Dimensions
RS Stock No. 145-2618
Mfr. Part No.BPW20RF
BrandVishay
HK$35.401
Each (In a Bag of 500)
units
Infrared, Visible Light 920nm TO-5 Through Hole 2 - Si 400nm 1100nm - 9.1mm 9.1mm 3.1mm -
RS Stock No. 177-7627
Mfr. Part No.BPW21R
BrandVishay
HK$88.633
Each (In a Box of 500)
units
Visible Light 565nm TO-5 Through Hole 2 - Si 420nm 675nm - 9.1mm 9.1mm 3.1mm -
RS Stock No. 177-5559
Mfr. Part No.PIN-25DP
HK$2,929.58
Each (In a Box of 2)
units
Visible Light 970nm BNC Surface Mount 1 - Si 350nm 1100nm - 42.55mm - 26.16mm -
RS Stock No. 815-1244
Mfr. Part No.BPW46
BrandVishay
HK$5.324
Each (In a Pack of 20)
units
- - - Through Hole - - - - - - 5mm 3mm 6.4mm -
RS Stock No. 168-5245
Mfr. Part No.BPW 21
HK$50.612
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 -
RS Stock No. 652-0207
Mfr. Part No.BPW 34 S-Z
HK$7.25
Each (In a Pack of 5)
units
Infrared, Visible Light 850nm DIP Surface Mount 2 - Si 400nm 1100nm - 4.5mm 4mm 1.2mm -
RS Stock No. 699-7616
Mfr. Part No.BPW34
BrandVishay
HK$9.33
Each (In a Pack of 5)
units
Infrared, Visible Light 900nm - Through Hole 2 - Si 430nm 1100nm - 4.5mm 4.3mm 2mm -
RS Stock No. 652-027
Mfr. Part No.QD7-5T
BrandCentronic
HK$346.51
Each
units
Infrared, Visible Light 340nm TO-5 Through Hole - - Si 430nm 900nm - - - - -
RS Stock No. 165-6174
Mfr. Part No.BPW46
BrandVishay
HK$4.128
Each (In a Bag of 1000)
units
- - - Through Hole - - - - - - 5mm 3mm 6.4mm -
RS Stock No. 846-705
Mfr. Part No.OSD15-E
BrandCentronic
HK$222.26
Each
units
Visible Light 630nm TO-5 Through Hole 3 - Si 350nm 800nm - - - 12.7mm -
RS Stock No. 177-5562
Mfr. Part No.PIN-10D
HK$1,002.235
Each (In a Box of 2)
units
Infrared 970nm BNC Surface Mount 1 - Si 350nm 1100nm - 24.77mm - 26.16mm -
RS Stock No. 912-8318
Mfr. Part No.BPW 34 S-Z
HK$3.337
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 -
RS Stock No. 177-5578
Mfr. Part No.FCI-INGAAS-500
HK$394.081
Each (In a Tray of 10)
units
- 1550nm TO-46 Through Hole 3 - InGaAs 900nm 1700nm - - - 3.75mm -
RS Stock No. 848-6285
Mfr. Part No.FCI-InGaAs-500
HK$293.76
Each
units
- 1550nm TO-46 Through Hole 3 - InGaAs 900nm 1700nm - - - 3.75mm -
RS Stock No. 497-5661
Mfr. Part No.BPW 21
HK$72.62
Each
units
Infrared, Ultraviolet, Visible Light 550nm TO-39 Through Hole 2 - Si 350nm 820nm - 9.5mm 9.5mm 3.7mm -
RS Stock No. 165-2428
Mfr. Part No.BPW34
BrandVishay
HK$3.35
Each (On a Reel of 3000)
units
Infrared, Visible Light 900nm - Through Hole 2 - Si 430nm 1100nm - 4.5mm 4.3mm 2mm -
RS Stock No. 848-6253
Mfr. Part No.PIN-25DP
HK$2,001.24
Each
units
Visible Light 970nm BNC Surface Mount 1 - Si 350nm 1100nm - 42.55mm - 26.16mm -
RS Stock No. 848-6288
Mfr. Part No.PIN-10D
HK$748.80
Each
units
Infrared 970nm BNC Surface Mount 1 - Si 350nm 1100nm - 24.77mm - 26.16mm -
RS Stock No. 168-5319
Mfr. Part No.SFH 235 FA
HK$3.306
Each (In a Bag of 1000)
units
Infrared 900nm - Through Hole 2 - Si 740nm 1120nm - 5.1mm 3.1mm 7.2mm -
RS Stock No. 168-5244
Mfr. Part No.SFH 2400 FA-Z
HK$3.527
Each (On a Reel of 2000)
units
Infrared 900nm DIP Surface Mount 3 - Si 750nm 1100nm - 2.1mm 2.7mm 1.05mm -