Avalanche photodiode (APD) module C30902SH-2

Product overview Excelitas C30902SH-2 is a silicon avalanche photodiode (Si-APD) in a 0.5 mm active diameter TO-18 package designed for photon counting and ultra-low-light detection. It delivers high responsivity near 905 nm, low dark counts and is available with optional single- or dual-stage thermoelectric cooling for improved stability and noise performance.

Features & Benefits

• 0.5 mm active diameter Si-APD in TO-18 flat-window package
• High quantum efficiency — typically 60% at 905 nm
• Low dark noise and low bulk dark current for single-photon sensitivity
• Internal avalanche gains >250 (linear mode)
• Spectral response: 860 nm – 960 nm
• Fast time response — typically 0.4 ns
• Operating temperature range: -40°C to +85°C
• Optional integrated thermoelectric cooler (single- or dual-stage)

Applications

• LiDAR / Time-of-Flight (ToF) systems
• Quantum communication and quantum optics
• Photon counting and single-photon detection
• Optical Time-Domain Reflectometry (OTDR)
• Laser scanning and rangefinding

Additional details Device supports Geiger mode (VOP > VBD) for single-photon detection with very low and stable dark count rates and low afterpulsing; amplification may not be required in Geiger mode. In linear mode (VOP < VBD) typical gains up to 250 are achievable. Intended for optical powers below 1 pW and ultra-low light level measurements. Cooling options (single/dual-stage TE) are available to further reduce dark counts and improve timing stability.

Technical specifications

• Active area: 0.2 mm²
• Active diameter: 0.5 mm
• Breakdown voltage: typ. 225 V
• Capacitance: typ. 1.5 pF
• Temperature coefficient: typ. 0.7 V/°C
• Dark current: 7 nA
• Dark noise: 0.1 pA/√Hz
• Noise equivalent power (NEP): 0.74 fW/√Hz
• Typical responsivity: 110 A/W at 900 nm
• Recommended gain: 250
• Package: TO-18, flat window