Avalanche photodiode (APD) module C30659-900-R8AH

Overview
The C30659 Series of hybrid optical APD receivers integrates a Silicon (Si) avalanche photodiode (APD) and a hybrid preamplifier in a hermetically sealed TO-8 package. The C30659-900-R8AH uses the C30817EH Si APD with peak responsivity at 900 nm and a 0.8 mm active diameter, providing sensitive detection across the visible–near IR range.

Design and performance
The Excelitas C30659 Series employs an inverting amplifier topology with an emitter-follower output buffer. The preamplifier uses a low-noise GaAs FET front end designed for higher transimpedance than the standard C30950 Series. The Si APDs match those used in C30817EH, C30902EH, C30954EH and C30956EH; InGaAs APDs are used in C30645EH and C30662EH. Devices deliver fast rise and fall times across wavelengths and reliable response from 400 to 1100 nm.

Applications / Notes
Hybrid integration of APD and preamplifier in a hermetically sealed TO-8 package enables low-noise detection suitable for high-sensitivity optical detection systems requiring fast response and low NEP. Typical applications include optical instrumentation, spectroscopy, and fiber-optic receiver front ends.

Characteristics / technical specifications

• System bandwidth: 50 MHz
• Low noise equivalent power (NEP):
  • 14 fW/√Hz at 830 nm
  • 12 fW/√Hz at 900 nm
• Spectral response range: 400 to 1100 nm
• Active diameter: 0.8 mm
• Typical power consumption: 150 mW
• Amplifier operating voltages: ±5 V
• 50 Ω AC load capability (AC-coupled)
• Hermetically sealed TO-8 package
• High reliability