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GaAlAs Photodiodes |
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Silicon detectors have been the detector-of-choice for UV to NIR applications for many years. However, their wide spectral response that applications requiring response across limited spectral range require additional optical filtering – adding complexity and cost whilst also reducing the in-band signal. ODC’s GaAlAs detectors are specifically targeted at applications requiring detection of an 880 nm LED and bring significant advantages to the system designer. They have a far narrower spectral range resulting in less background signal whilst responsivity at 880 nm is higher than for a silicon device. As a general rule a designer can expect the signal-to-background figure for the GaAlAs detector will be 2—3 times higher than for any silicon/filter combination and >15 times higher than for a bare silicon detector. For a detailed article discussing the relative merits of Opto Diode’s GaAlAs detectors compared to silicon photodiodes please click here. GaAlAs detectors are available in two standard sizes in either case-live or case-isolated configurations. |
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Part Number Click for PDF |
Package |
Active Area |
Dark Current nA @ 5 V |
Capacitance pF (Typ) |
Rise Time µS @ 5 V |
Responsivity A/W @ 0 V |
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mm˛ |
Typ |
Max. |
0 V |
5 V |
Typ. |
650 nm |
750 nm |
880 nm |
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|
TO-18, Window |
1.0 |
0.4 |
2.0 |
170 |
90 |
1 |
0.005 |
0.01 |
0.6 |
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ODD-45WISOL |
TO-18, Window, Isolated |
1.0 |
0.4 |
2.0 |
170 |
90 |
1 |
0.005 |
0.01 |
0.6 |
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TO-5, Window |
5.0 |
1.0 |
5.0 |
700 |
350 |
1 |
0.005 |
0.01 |
0.6 |
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ODD-95WISOL |
TO-5, Window, Isolated |
5.0 |
1.0 |
5.0 |
700 |
350 |
1 |
0.005 |
0.01 |
0.6 |