Features

l High reliability photodiode with ceramic scintillator

High X-ray sensitivity: 1.8 times higher than CWO scintillator

Less afterglow: <0.1 %/3 ms, <0.01 %/30 ms

No deliquescence

l 5 × 5 element photodiode array

l Number of channels can be increased by connecting

several S7978 together.

Applications

l X-ray analysis, X-ray detection

PHOTODIODE

Si photodiode array

5 × 5 element array for X-ray detector

S7978

s Absolute maximum ratings (Ta=25

°C)

Parameter

Symbol

Value

Unit

Reverse voltage

V

Operating temperature

Topr

-10 to +60

°C

Storage temperature

Tstg

-20 to +70

°C

s Electrical and optical characteristics (Ta=25

°C, per 1 element, without scintillator)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Spectral response range

λ

With resin

-

220 to 1000

-

nm

Peak sensitivity wavelength

λp

-

720

-

µm

Photo sensitivity

S

λ=500 nm, with resin

-0.36

-A/W

Dark current

-

0.1

10

pA

Terminal capacitance

Ct

-

30

50

pF

s X-ray sensitivity (reference value, per 1 element, tube current: 1.0 mA, aluminum filter: t=6 mm, distance=830 mm)

X-ray tube voltage

Typ.

Unit

120 kV

2.1

nA

Note) Depends on equipment and measurement conditions.

1