photodiode arrayS for x-ray Security Scanning
Left: 16 Element, 1.6 mm Pitch
Photodiode Array With Segmented
Csi Scintillator.
Right: 16 Element, 2.5 mm Pitch
Photodiode Array With GOS Low
Energy Screen Scintillator.
Photodiode Arrays – VTA Series
applications
• Luggage scanning
• Cargo & container scanning
• Food inspection
• Non-destructive testing
features and Benefits
• Various crystal types available (CsI, GOS, etc.)
• Custom chip geometry & pitch
• Single or dual-sided assemblies
• High responsivity and low capacitance
• Onboard electronics available on a custom basis
• Multiple photodiode rows
product description
These photodiode arrays are used to generate an X-ray image by scanning an object line by line.
The X-rays are converted into light through the attached scintillator crystal. The light intensity is then
measured by the photodiodes. The boards are employing chip-on-board technology with optically
adapted scintillator crystals. The listed designs can be ordered as a standard part, but can also be cus-
tomized to meet the needs of a wide variety of applications. Excelitas custom photodiode arrays give
customers the option to choose the:
• active photodiode area
• total number of elements
• overall PCB and photodiode chip dimensions
• photodiode chip geometry and orientation
• electro-optical specifications
• single sided vs. double sided PCB
• alternative substrate materials (e.g. ceramic)
• electrical interface (e.g. connector)
First stage amplification electronics can also be added to the custom board design to convert the
current generated by the photodiode into an easy to measure voltage.
Product Table
Photodiode Arrays • VTA Series
Active
Area
Design
Photodiode
Chip Dimensions
Design
Number
of
Elements
Scintillator
Crystal
Type
Light Current
Uniformity
@ 540 nm,
30 nW/cm
2
Dark Current
@ H = 0,
VR = 10 mV
typ
I
D
mm
mm
2
Substrate
Material
Symbol
Unit
Dimensions
Pitch
Junction
Capacitance
@ H = 0, VR = 0 V
typ
C
J
pF
max
C
J
pF
Radiometric
Sensitivity
@ 540 nm
min
S
R
A/W
max
I
D
pA
mm
mm
%
pA
VtA2164H- D- nc- 00- 0
VtA1616H- H- Sc- 01- 0
VtA1616H- L- Sc- 02- 0
VtA2516H-H- Sc- 01- 0
VtA2516H-L- Sc- 02- 0
VtA1216H- H- nc- 00-0
VtA1216H- L- nc- 00-0
VtA0832H-H-nc- 00-0
FR4
FR4
FR4
FR4
FR4
FR4
FR4
FR4
43.2 x 67.7
8.0 x 25.4
16.0 x 25.4
8.0 x 40.0
16.0 x 40.0
10.2 x 19.0
17.8 x 19.0
17.8 x 25.4
1.41
2.58
2.58
5.20
5.20
3.44
3.44
0.50
1.40 x 3.50
1.51 x 3.25
1.51 x 3.25
2.45 x 3.15
2.45 x 3.15
2.30 x 4.95 (dual cell)
2.30 x 4.95 (dual cell)
1.59 x 2.34 (dual cell)
2.1
1.6
1.6
2.5
2.5
1.2
1.2
0.8
64
16
16
16
16
16
16
32
Custom
CsI
GOS
CsI
GOS
Custom
Custom
Custom
±5
±5
±5
±5
±5
±5
±5
±5
<10
-
-
-
-
-
-
-
90
50
50
50
50
100
100
100
<100
-
-
-
-
-
-
-
200
350
350
600
600
300
300
100
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
Electrical characteristics at T
Ambient
= 25 °C
14
www.excelitas.com
Figure 1
Side 1 Detail VtA2164H-D
Pin out VtA2164H-D
connector J1
(top Diodes)
Pin
Connection
connector J2
(Bottom Diodes)
Pin
Connection
1
2
D32
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
D32
N/C
Common
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
D32
N/C
Common
3
4
5
6
7
8
D1
ø
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Figure 2
Side 2 Detail VtA2164H-D
Figure 3
Figure 4
chip Spacing Details, Side 1 (typ) VtA2164H-D
Photosensitive Area 0.0545“ x 0.0385 (Typ.) or 0.0021 SQ. IN.
Pos. of top Diodes Rel. to Bottom Diodes VtA2164H-D
(Optical Center Line to Optical Center Line)
www.excelitas.com
Photodiode Arrays – VTA Series
15
PCB设计
