datasheetbank_Logo
Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site

H7421 View Datasheet(PDF) - Hamamatsu Photonics

Part Name
Description
View to exact match
H7421
Hamamatsu
Hamamatsu Photonics Hamamatsu
H7421 Datasheet PDF : 4 Pages
1 2 3 4
Metal package PMT with Cooler
Photon Counting Head H7421 Series
Heatsink with fan (A7423) sold separately
The H7421 series are photon counting head devices containing a metal
package photomultiplier tube having a GaAsP/GaAs photocathode and a
thermoelectric cooler. The thermoelectric cooler reduces thermal noise gen-
erated from the photocathode which also offers a high quantum efficiency, al-
lowing measurement to be made with a good S/N ratio even at very low light
levels.
The H7421-40 has high sensitivity on wavelength from 300 nm to 720 nm.
The H7421-50 is sensitive over a wide spectral range from 380 nm to 890 nm.
The photomultiplier tube is maintained at a constant temperature by monitor-
ing the output from a thermistor installed near the photomultiplier tube and
regulating the current to the thermoelectric cooler.
Product Variations
Type No.
H7421-40
H7421-50
Spectral Response
Features
300 nm to 720 nm GaAsP photocathode, QE 40 % at peak wavelength
380 nm to 890 nm GaAs photocathode, QE 12 % at peak wavelength
Specifications
Parameter
H7421-40
Input Voltage
+4.5 to +5.5
Max. Input Voltage for Main Unit
+6
Max. Input Current for Main Unit
50
Max. Input Voltage for Thermoelectric Cooler
2.6
Max. Input Current for Thermoelectric Cooler
2.2
Effective Area
5
Peak Sensitivity Wavelength
580
Count Sensitivity
7.8 × 105
Count Linearity *1
1.5 × 106
Typ.
100
Dark Count *2 *3
Max.
300
Pulse-pair Resolution
70
Output Pulse Width
30
Typ.
3.6
Output Pulse Height *4
Min.
3.0
Recommended Load Resistance
50
Signal Output Logic
Positive logic
Operating Ambient Temperature
+5 to +35
Storage Temperature
-20 to +50
Weight
340
*1: Random pulse, at 10 % count loss
*2: PMT setting temperature 0 °C, used with C8137, M9011 and A7432
*3: After 30 minute storage in darkness
*4: With input voltage +5 V, Load resistance 50 and Coaxial cable RG-174/U (450 mm)
H7421-50
800
3.9 × 105
1.5 × 106
125
375
Cooling Specifications
Parameter
Cooling Method
Max. Cooling Temperature (T) *5
Cooling Time *5
*5: Input current to thermoelectric cooler = 2.0 A
40
H7421-40/H7421-50
Thermoelectric cooling
35
Approx. 5
Unit
V
V
mA
V
A
mm
nm
s-1·pW-1
s-1
s-1
ns
ns
V
°C
°C
g
Unit
°C
min
 

Share Link: 

datasheetbank.com [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]