HAMAMATSU R4998 Datasheet

Fast Time Response, 25 mm (1 Inch) Diameter,
10-stage, Bialkali Photocathode, Head-On Type

GENERAL

Parameter Description/Value Unit

Spectral Response
Wavelength of Maximum Response

Photocathode
Window Material
Dynode
Base

Suitable Socket

Material
Minimum Effective Area

Structure
Number of Stages

PHOTOMULTIPLIER TUBE

R4998

300 to 650

420

Bialkali

20

Borosilicate glass

Linear-focused

10

12-pin base JEDEC No. B12-43

E678-12A (supplied)

nm
nm

—

mm dia.

—
—
—
—
—

MAXIMUM RATINGS (Absolute Maximum Values)

Parameter Value Unit

Supply Voltage
Average Anode Current

Ambient Temperature

Between Anode and Cathode
Between Anode and Last Dynode

CHARACTERISTICS (at 25°C)

Parameter Min. Unit

Luminous (2856K)

Cathode Sensitivity

Anode Sensitivity
Gain

Anode Dark Current (after 30min. storage in darkness)
Time Response

NOTE: Anode characteristics are measured with the voltage distribution ratio shown below.

Radiant at 420nm
Blue (CS-5-58 filter)
Luminous (2856K)
Radiant at 420nm

Anode Pulse Rise Time
Electron Transit Time

60
—
—

100

—
—
—
—
—

VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE

Electrodes
Ratio

Supply Voltage: 2250Vdc, K: Cathode, Dy: Dynode, P: Anode

K Dy1G

1.3

4.8

1.2

Dy2

1.8

Dy3

Dy4

Dy51Dy61Dy7

11

1 1.5 3 2.5

2500

250

0.1

-30 to +50

Typ. Max.

70
72

9.0

400

4.1 × 10

5.7 × 10

Dy8 Dy9 Dy10 P

5
6

100

0.7
10

—
—
—
—
—
—

800

—
—

Vdc
Vdc

mA

°C

µA/lm
mA/W

µA/lm-b

A/lm
A/W

—

nA

ns
ns

Assembled type (H6533) is recommended.

Subject to local technical requirements and regulat ions, availability of products included in this promotional material may va r y. Please consult with our sales office.
Information furnished by HAMA M ATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are

subject to change without notice. No patent rights are granted to any of the circuits described herein.

1999 Hamamatsu Photonics K.K.

©

PHOTOMULTIPLIER TUBE R4998

Figure 1: Typical Spectral Response

TPMHB0518EA

100

CATHODE
RADIANT
SENSITIVITY

10

QUANTUM

1

QUANTUM EFFICIENCY (%)

0.1

CATHODE RADIANT SENSITIVITY (mA/W)

0.01

EFFICIENCY

200 800600400

WAVELENGTH (nm)

1000

Figure 2: Typical Gain Characteristics

TPMHB0612EA

8

10

7

10

6

10

5

10

GAIN

4

10

3

10

2

10

500 1000 1500 2000

SUPPLY VOLTAGE (V)

2500 3000

Figure 3: Dimensional Outline and Basing Diagram (Unit: mm)

26 ± 1

FACEPLATE

PHOTO­CATHODE

HA COATING

SMA
CONNECTOR

A

12 PIN BASE
JEDEC
No. B12-43

B

20 MIN.

37.3 ± 0.5

71 ± 1

13 MAX.

52 MIN.

A TEMPORARY BASE REMOVED

DY10

12

DY8

13

14

15
16

17

1

18

G

K

DY9

DY7

(Acc)

DY5

4

DY3

P

5

3

2
DY1

B BOTTOM VIEW

DY10

DY8

6

7

DY6

8

9

10

11

1

12

G

K

DY7

(Acc)

DY5

P

DY9

5

4

3

2

DY3

DY1

DY6

DY4

DY2

DY4

DY2

TPMHA0093EC

2- 3.2

Socket

(E678-12A)

47

40
17

34

5

8

15

TACCA0009EB

HAMAMATSU PHOTONICS K.K., Electron Tube Center

HOMEPAGE URL http://www.hamamatsu.com

314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: [phone], Fax: [phone]

U.S.A.:

Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: [phone], Fax: [phone]

Germany:

Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: [phone], Fax: [phone]

France:

Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: [phone], Fax: [phone]

United Kingdom:
North Europe:
Italy:

Hamamatsu Photonics UK Limited: Lough Point, 2 Gladbeck Way, Windmill Hill, Enfield, Middlesex EN2 7JA, United Kingdom, Telephone: [phone], Fax: [phone]

Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171-41 SOLNA, Sweden, Telephone: [phone], Fax: [phone]

Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: [phone], Fax: [phone]

TPMH1261E02
DEC. 1999