Optical sensors
Fast, sensitive
501201 501203 501202 501204 501251 501266
Series i
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InGaAs detectors

First Sensor offers large-area InGaAs PIN photodiodes with active sensor surfaces up to 3 mm in diameter. The diodes feature low dark currents and high sensitivity up to 1700 nm wavelength. A model enhanced for the visible wavelength range is also available. Housing options include both hermetic TO solutions as well as SMD versions. Ask us about your specific sensor solution.

Special features
  • High sensitivity up to 1700 nm
  • Low dark current
  • Active sensor area between 0.7 and 7 mm²
InGaS detectors of First SensorTechnical specifications and PDF datasheet
Order # Chip Package Active Area
Size (mm) /
Area (mm²)
Response (A/W)
at 650 nm / at 1550 nm
Dark current (nA)
at 5V (nA)
(pF) at 5 V
501201 PC0.7-i LCC6.1 1.0 / 0.7 0.05 / 0.95 2 70 900…1700
501203 PC0.7-i TO52S1 1.0 / 0.7 0.05 / 0.95 2 70 900…1700
501202 PC0.7-ix LCC6.1 1.0 / 0.7 0.3 / 0.95 2 70 600…1700
501204 PC0.7-ix TO52S1 1.0 / 0.7 0.3 / 0.95 2 70 600…1700
501251 PC2.6-i TO5i 2.0 / 2.6 0.05 / 0.95 10 250 900…1700
501266 PC7.1-i TO5i 3.0 / 7.1 0.05 / 0.95 25 700 900…1700
Technical specifications and PDF datasheet *
Order # Package Active Area
Size (mm) /
Area (mm²)
501201 LCC6.1 1.0 / 0.7
501203 TO52S1 1.0 / 0.7
501202 LCC6.1 1.0 / 0.7
501204 TO52S1 1.0 / 0.7
501251 TO5i 2.0 / 2.6
501266 TO5i 3.0 / 7.1
* For large screens, this table contains more technical specifications. For mobile devices, they are not shown.

For price and delivery information or any other question please contact First Sensor.
First Sensor AG is among the world's leading providers in the area of sensor technology. Our company develops and manufactures both standardized and tailor-made sensor solutions for applications in the industrial, medical and mobility growth markets. We will be among the top three providers in our core markets by 2019.
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First Sensor specializes in the development and manufacture of custom sensors, electronics, modules and complex systems. As a solution provider the company offers complete development services from a first draft and proof of concept up to the development of prototypes and finally serial production. First Sensor offers comprehensive development expertise, state-of-the-art packaging technologies and production capacities in clean rooms from ISO class 8 to 5.
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