PHOTOMULTlPLlER TUBE
R2557
For Photon Counting, Low Light Level Detection
13mm(1/2 Inch) Diameter, Low Noise Bialkali Photocathode
Borosilicate Glass Window, 10鈥搒tage, Head鈥揙n Type
GENERAL
Parameter
Spectral Response
Wavelength of Maximum Response
MateriaI
Photocathode
Minimum Effective Area
Window Material
Structure
Dynode
Number of Stages
Anode to Last Dynode
Direct Interelectrode
Capacitances
Anode to All Other Electrodes
Base
SuitabIe Socket
Description/Value
300 to 650
375
Low noise bialkali
10
Borosilicate glass
Linear focused
10
1.0
2.0
13鈥損in glass base
E678鈥?3A(supplied)
Unit
nm
nm
mm dia.
pF
pF
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Between Anode and Cathode
Supply Voltage
Between Anode and Last Dynode
Avarage Anode Current
Ambient Temperature
Value
1500
250
0.03
鈥?0 to +50
Unit
Vdc
Vdc
mA
CHARACTERISTlCS (at 25
)
Min.
25
Max.
Unit
A/lm
mA/W
A/lm b
A/lm
A/W
nA
cps
ns
ns
Typ.
40
50
Cathode Sensitivity
3.5
5.5
50
200
Anode Sensitivity
2.5 10
5
5.0 10
6
Gain
Anode Dark Current (after 30min. storage in darkness)
0.5
10
Anode Dark Counts
Anode Pulse Rise Time
2.2
Time Response
Electron Transit Time
22
NOTE:
Anode characteristics are measured with the voItage distribution ratio shown below.
Parameter
Luminous (2856K)
Radiant at 375nm
Blue (CS鈥?鈥?8 filter)
Luminous (2856K)
Radiant at 375nm
4.0
30
VOLTAGE DlSTRlBUTlON RATlO AND SUPPLY VOLTAGE
K
Dy1
Dy2
Dy3
Electrodes
Ratio
2
1
1
SuppIy Voltage : 1250Vdc,
K : Cathode,
Dy4
Dy5
Dy6
1
1
P : Anode
Dy7
1
Dy8
1
Dy9
1
Dy10
1
P
1
1
Dy : Dynode,
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
lnformation furnished by HAMAMATS U is believed to be reliabIe. However, no responsibility is assumed for possibIe inaccuracies or commission. Specifications are
subjected to change without notice. No patent right are granted to any of the circuits described herein.
漏
1991 Hamamatsu Photonics K.K.
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