Extended InGaAs Photodiodes

Expanded Wavelength Detection

Extended InGaAs photodiodes are designed to detect longer near-infrared wavelengths beyond the cutoff of standard InGaAs devices, typically extending sensitivity to approximately 2.2–2.6 µm. This broader response allows detection in spectral regions that conventional InGaAs cannot reach, effectively bridging the gap between standard InGaAs and mid-infrared detectors.

By adjusting the material composition, extended InGaAs devices achieve wider spectral coverage while preserving many of the advantages of InGaAs technology, including high quantum efficiency and relatively fast response. Extending the cutoff wavelength, however, generally results in increased dark current, which must be carefully managed in low-noise or high-precision systems.

Extended InGaAs Photodiodes
Extended InGaAs Photodiodes Datasheet

These photodiodes are commonly used in gas sensing, spectroscopy, environmental monitoring, and industrial process control, where access to longer NIR absorption features is important. They provide a practical balance of wavelength range, performance, and cost compared with more complex mid-infrared detector technologies.

Features

  • Chip active diameters from 0.3 mm to 3 mm
  • Extended cutoff wavelengths (1.9μm, 2.05μm, 2.2μm and 2.6μm)
  • High shunt resistance
  • Multiple window and lens options
  • Packages (TO-46, TO-18 or TO-5)
  • Thermoelectric cooled options available

Applications

  • Gas sensing
  • Hydrocarbon sensing
  • Flame and spark detection
  • FTIR
  • Spectroscopy
  • SWIR photodetection

Opto/Electronic Characteristics @ 23oC ± 2oC
Part Number Spectral response range Photosensitive area Peak sensitivity wavelength (typ.) Responsivity @ λp (min./max.) Capacitance @ 0V (typ.) Dark Current (max.) Package Category
N19S30-XX 1.0 – 1.9µm 0.3mm 1.75µm 0.9/1.0 A/W 60pF 0.1µA @ 1V TO-46, TO-18
N19S50-XX 1.0 – 1.9µm 0.5mm 1.75µm 0.9/1.0 A/W 200pF 0.9µA @ 1V TO-46, TO-18, LCC-6
N19S100-XX 1.0 – 1.9µm 1.0mm 1.75µm 0.9/1.0 A/W 600pF 4µA @ 1V TO-46, TO-18, TO-5, LCC-6
N19S200-XX 1.0 – 1.9µm 2.0mm 1.75µm 0.9/1.0 A/W 3000pF 10µA @ 1V TO-5, LCC-6
N19S300-XX 1.0 – 1.9µm 3.0mm 1.75µm 0.9/1.0 A/W 6750pF 22.5µA @ 0.5V TO-5, LCC-28
N21S30-XX 1.0 – 2.1µm 0.3mm 1.9µm 0.9/1.0 A/W 80pF 0.5µA @ 1V TO-46, TO-18
N21S50-XX 1.0 – 2.1µm 0.5mm 1.9µm 0.9/1.0 A/W 250pF 1µA @ 1V TO-46, TO-18, LCC-6
N21S100-XX 1.0 – 2.1µm 1.0mm 1.9µm 0.9/1.0 A/W 500pF 4µA @ 1V TO-46, TO-18, TO-5, LCC-6
N21S200-XX 1.0 – 2.1µm 2.0mm 1.9µm 0.9/1.0 A/W 1600pF 10µA @ 1V TO-5, LCC-6
N21S300-XX 1.0 – 2.1µm 3.0mm 1.9µm 0.9/1.0 A/W 4000pF 12µA @ 0.5V TO-5, LCC-28
N22S30-XX 1.0 – 2.3µm 0.3mm 2.0µm 0.9/1.0 A/W 90pF 1µA @ 1V TO-46, TO-18
N22S50-XX 1.0 – 2.3µm 0.5mm 2.0µm 0.9/1.0 A/W 275pF 5µA @ 1V TO-46, TO-18, LCC-6
N22S100-XX 1.0 – 2.3µm 1.0mm 2.0µm 0.9/1.0 A/W 1000pF 10µA @ 1V TO-46, TO-18, TO-5, LCC-6
N22S200-XX 1.0 – 2.3µm 2.0mm 2.0µm 0.9/1.0 A/W 4000pF 40µA @ 1V TO-5, LCC-6
N22S300-XX 1.0 – 2.3µm 3.0mm 2.0µm 0.9/1.0 A/W 8000pF 100µA @ 1V TO-5, LCC-28
N26S30-XX 1.0 – 2.6µm 0.3mm 2.0µm 0.9/1.0 A/W 100pF 13µA @ 1V TO-46, TO-18
N26S50-XX 1.0 – 2.6µm 0.5mm 2.0µm 0.9/1.0 A/W 270pF 20µA @ 0.5V TO-46, TO-18, LCC-6
N26S100-XX 1.0 – 2.6µm 1.0mm 2.0µm 0.9/1.0 A/W 1000pF 80µA @ 0.5V TO-46, TO-18, TO-5, LCC-6
N26S200-XX 1.0 – 2.6µm 2.0mm 2.0µm 0.9/1.0 A/W 4400pF 320µA @ 0.5V TO-5, LCC-6
N26S300-XX 1.0 – 2.6µm 3.0mm 2.0µm 0.9/1.0 A/W 10000pF 500µA @ 0.5V TO-5, LCC-28