The SMPX 140 series is a range of hybrid opto-electronic components incorporating a 15mm2 PiN photodiode, operational amplifier and transimpedance circuitry. The photodiode is operated at zero bias for best linearity and lowest dark current.

Features:
• 15mm2 active area photodiode
• High sensitivity in applications where detection is required over a large area
• Gain, bandwidth and filter can be specified to suit application
• Photodiode size: 4 x 4 mm
• Integral optical filter option
• Low input bias current: 1 pa (typ.) @ 25°c
• Low amplifier input offset voltage: 500 V (max) @ 25°c
• Low noise voltage: < 12nV/KHz @ 1KHz
• Supply voltages: + 5v to + 8v
• Wide intrinsic bandwidth: > 2MHz (typ.)
• High transimpedance gain possible: 47MW max.
• EMI screening mesh available

>> SMPX140 Datasheet

Applications:
These devices are especially suited to low-light level or applications where high sensitivity is required:

• Medical instruments
• Document verification
• Laboratory instrumentation
• Position and proximity detectors
• Pollution/environmental monitoring
• Smoke/Gas detectors
• Complements SMPX600 range of Self-Monitoring Emitters

Design:
Incorporation of the photodiode and amplifier into a welded metal can (with optional electrostatic screening mesh) minimising noise pickup, leakage current errors and stray capacitance normally associated with discrete designs.

Various optical filters can be incorporated inside the package to pass selected regions of the ultraviolet to infrared spectrum.The optical filters can be ionically coloured glass or vapour deposited dielectric layers on a glass substrate. For more details of the filter permutations, contact Semelab.