Model No. ET-3500 ET-3500F ET-4000 ET-4000FDetector Type PIN PIN PIN PINDetector Material InGaAs InGaAs GaAs GaAsSpectral Range 1000-1650nm 1000-1650nm 450-870nm 450-870nmRisetime <35ps <35ps <35ps <35psFalltime <35ps <35ps <35ps <35psResponsivity 0.88A/W@1550nm 0.88A/W@1550nm 0.45A/W@850nm 0.45A/W@850nmBias Voltage 6V 6V 6V 6VCut Off Frequency >10GHz >10GHz >10GHz >10GHzActive Area 32µm dia. 32µm dia. 40µm dia. 40µm dia.Dark Current <3nA <3nA <200pA <200pAJunction Capacitance 0.12pF 0.12pF 0.3pF 0.3pFNoise Equivalent Power (pW/√Hz)b <0.04 <0.04 <0.02 <0.02Electrical Connector SMA SMA SMA SMAMounting (Tapped Hole) 8-32 and M4 8-32 and M4 8-32 and M4 8-32 and M4Fiber Optic Connection N/A 9/125µm SMF N/A 9/125µm SMFc

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Notes: a. All specifications apply for a 50Ω termination unless otherwise noted. b. Short circuit output c. Multi-mode fiber available. May limit bandwidth to <10GHz. d. All >10GHz photodetectors have an internal 50Ω termination.

1. For more information on our >10GHz photodetectors, please view the Photodetector Application Notes page in the Publications & Technical Support section of the website. 2. For information on the use of our >10GHz photodetectors, please view the Photodetector Users Guide page in the Publications & Technical Support section of the website. 3. To convert frequency response to time domain response or vice versa, please view our Frequency Response to Time Domain Response Conversion calculator in the Publications & Technical Support section on this website. 4. To convert between watts and dBm, please view our Power Conversion calculator on the Publications & Technical Support section of this website. Insert Drawings and Spectral Response Curves 5. Warranty/Terms and Conditions: Please visit the Photodetector Warranty/Terms and Conditions pages in the Publications & Technical Support section of this website.