PHOTOMULTlPLlER TUBE
R2257
For visible to near IR low light detections
Extended red multialkali photocathode
51mm(2 Inch) diameter, 12–stage, Head–on 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 900
600
Extended red multialkali
46
Borosilicate glass
Linear focused
12
2
2.5
21–pin glass base
E678–21A(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
2700
500
0.2
-80 to +50
Unit
Vdc
Vdc
mA
CHARACTERISTlCS (at 25
Cathode
Sensitivity
)
Min.
140
Typ.
230
50
0.35
100
2.2 10
4
4.3 10
5
30
2.6
48
Max.
Unit
A/lm
mA/W
A/lm
A/W
100
nA
ns
ns
Anode
Sensitivity
Gain
Dark Current (after 30min. storage in darkness)
Time
Anode Pulse Rise Time
Response
Electron Transit Time
Parameter
Luminous(2856K)
Radiant at 600nm
Red/White Ratio (R–68 filter)
Luminous(2856K)
Radiant at 600nm
15
NOTE:
Anode characteristics are measured with the voItage distribution ratio shown below.
VOLTAGE DlSTRlBUTlON RATlO AND SUPPLY VOLTAGE
K
G
Dy1 Dy2
Dy3 Dy4
Dy5 Dy6 Dy7 Dy8 Dy9 Dy10 Dy11 Dy12
Electrodes
Ratio
4
0
1
1.4
1
1
1
1
1
1
1
1
1
1
SuppIy Voltage : 1500Vdc,
K : Cathode, Dy : Dynode, G : Grid, P : Anode
Shield is connected to Dy5.
P
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.
©
1997 Hamamatsu Photonics K.K.
HAMAMATSU [ HAMAMATSU CORPORATION ]
