Micro-PMT photon counting head


H12406 series has an internal photon counting circuit. The H12406 is bialkali photocathode micro PMT photon counting head with spectral response range from 300 nm to 650 nm.

Spectral response 300 nm to 650 nm
Peak sensitivity wavelength 420 nm
Photocathode material Bialkali
Window material Borosilicate glass
Effective area 1 mm x 3 mm
Input voltage +4.75 V to +5.25 V
Max. Input voltage +6 V
Max. Input current 40 mA
Count sensitivity at 300 nm Typ. 1.7 x 105 s-1・pW-1
Count sensitivity at 400 nm Typ. 3.6 x 105 s-1・pW-1
Count sensitivity at 500 nm Typ. 2.6 x 105 s-1・pW-1
Count sensitivity at 600 nm Typ. 4.3 x 104 s-1・pW-1
Count sensitivity at 700 nm Typ. 1.4 x 102 s-1・pW-1
Count linearity 5.0 x 106 s-1
Dark count Typ. 10 s-1
Dark count Max. 50 s-1
Pulse-pair resolution 20 ns
Output pulse width 10 ns
Output pulse height (at load resistance 50 Ω) Min. +2.0 V
Output pulse height (at load resistance 50 Ω) Typ. +2.2 V
Recommended load resistance 50 Ω
Signal output logic Positive logic
Excessive light detection output (Excessive light incident) Min. +3.5 V
Excessive light detection output (Normally) Max. +0.5 V

Block diagram

Dimensional outline (Unit mm)

Signal input/output

Cable  Color Signal type
UL1430 AWG26 Black GND
Red Low voltage input (+5 V)
Blue Over light detection output
RG-174/U - Signal output / Signal GND (Coaxial)

Details of input window

Cross section

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