DATASHEET
Photon Detection
VTA2516H Series
Linear Photodiode Array (PDA) for X-ray Scanning
VTA2516H-L-SC-08
Key Features
The VTA2516H series is a 16-channel High Resolution Photodiode Array (PDA).
There are 16 single element photodiodes mounted directly on an FR-4 PCB.
The pitch (sensor-to-sensor spacing of adjacent chips) for this series is
2.5 mm; other pitches are available as off the shelf or as custom devices.
A molded encapsulant of X-ray radiation hard, transparent material protects
the device from damage and environmental influences. These parts are
available with or without a scintillator material mounted over the photodiode
active area to convert X-rays into visible photons of light.
These devices can be used as single energy detectors with a range of available
scintillator crystals. They can also be used in dual-energy systems in a stacked
configuration for simultaneous detection of low and high energy radiation for
better atomic number discrimination. This technique is particularly useful in
security applications such as luggage scanning in airports or at critical
infrastructure locations (train stations, sports stadiums, courthouses, etc.).
Photodiodes with extremely low
dark current
High signal to noise ratio
Scintillator crystals available on
demand to convert incident X-rays
into visible photons
X-ray hard structure – no aging
Extremely durable against
humidity
16 channels at 2.5mm pitch
Applications
Luggage Scanning
Food inspection
Cargo/container screening
Non-destructive testing
Industrial inspection
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VTA2516H-Rev.0-2013.07.12
VTA2516H Series
Linear Photodiode Array (PDA) for X-ray Scanning
Nomenclature
VTA2516H series part numbers are in the following format:
VTA2516H-W-XX-YY-Z
W:
XX:
YY:
Z:
Energy type (H-High, L-Low)
Scintillator (NC-No scintillator, SC-With scintillator)
Scintillator type (see
Scintillator Selection Guide
section below for all standard scintillator types)
Photodiode type (0-Regular capacitance)
Scintillator Selection Guide*
High Energy Scintillator
Type no.
VTA2516H-H-NC-00
VTA2516H-H-SC-01
VTA2516H-H-SC-05
Characteristics
No scintillator
CsI-Tl, 3 mm thick, segmented
Gd
2
O
2
S:Pr, 1.5 mm thick, segmented
Type no.
VTA2516H-L-NC-00
VTA2516H-L-SC-03
VTA2516H-L-SC-08
Low Energy Scintillator
Characteristics
No scintillator
Gd
2
O
2
S:Tb sheet, 310 µm thick,
DRZ-High
Gd
2
O
2
S:Pr sheet, 200 µm thick
* Scintillators are available using other materials and geometries upon request.
Typical Scintillator Characteristics*
Parameter
Value
Parameter
SC-01
SC-05
Decay Time (μs)(@ 1/e)
Gd
2
O
2
S:Pr
Composition
CsI-Tl
Decay Time (μs) to 10% peak
512
Emission peak
550
Afterglow (after 30ms)
0.078%
Decay time (@ 1/e)
1
4
Afterglow (after 100ms)
Decay time to 10 % peak
5
7
Light Yield (Photons/KeV)
40
0.500
0.015
Afterglow
(after 100 ms)
(after 20 ms)
Wavelength (nm)
7.33
Density
4.51
Absorption of 2mm to stop 90 KeV Photons
99.4%
Density (gm/cm )
7.34
* These characteristics are typical, specifications will vary from manufacturer.
Parameter
Decay Time (μs)(@ 1/e)
Decay Time (μs) to 10% peak
Afterglow (after 30ms)
Afterglow (after 100ms)
Light Yield (Photons/KeV)
Wavelength (nm)
Absorption of 2mm to stop 90 KeV Photons
Density (gm/cm )
3
3
SC-03
Gd
2
O
2
S:Tb sheet
545
600
1500
-
7.33
SC-08
Gd
2
O
2
S:Pr sheet
512
3
7
0.020
(after 100 ms)
7.33
Unit
nm
µs
µs
%
gm/cm
3
Value
0.078%
40
99.4%
7.34
c
Parameter
www.excelitas.com
Decay Time (μs)(@ 1/e)
Value
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VTA2516H-Rev.0-2013.07.12
VTA2516H Series
Linear Photodiode Array (PDA) for X-ray Scanning
Electro-Optical Characteristics
Parameter
Short circuit current
Open circuit voltage
Forward voltage
Dark current
Junction capacitance
Breakdown voltage
Responsivity @ 550 nm
Responsivity @ 900 nm
Peak spectral sensitivity
Spectral response
Effective sensitive area
(per element)
Chip size
Element pitch
Number of elements
Symbol
I
SC
V
OC
V
F
I
D
C
J
V
BR
550
950
max
range
A
l*w
Conditions
25 ° C / 1000 lx
2850 K
25 ° C / 1000 lx
2850 K
25 ° C / 10 mA
25 ° C/ 0 lx
±10 mV applied
25 ° C / 0 lx
0 V applied
25 ° C / 0 lx
25 ° C
± 10 mV applied
25 ° C
± 10 mV applied
VTA2516H-W-XX-YY-0
Min.
36
380
0.4
10
450
20
0.31
0.45
0.34
0.55
900
400
5.16
3.15 x 2.45
2.49
16
1100
1.2
50
600
Typ.
40
Max.
48
Unit
µA
mV
V
pA
pF
V
A/W
A/W
nm
nm
mm²
mm²
mm
element
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Page 3 of 6
VTA2516H-Rev.0-2013.07.12
VTA2516H Series
Linear Photodiode Array (PDA) for X-ray Scanning
Physical Configuration
VTA2516H-H (Dimensions are in mm)
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
Electrical Connection
Not connected
Not connected
Anode 1
Anode 3
Anode 5
Anode 7
Anode 9
Anode 11
Anode 13
Anode 15
Common Cathode
Common Cathode
PIN#
13
14
15
16
17
18
19
20
21
22
23
24
Electrical Connection
Not connected
Not connected
Anode 16
Anode 14
Anode 12
Anode 10
Anode 8
Anode 6
Anode 4
Anode 2
Common Cathode
Common Cathode
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VTA2516H-Rev.0-2013.07.12
VTA2516H Series
Linear Photodiode Array (PDA) for X-ray Scanning
VTA2516H-L (Dimensions are in mm)
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
Electrical Connection
Not connected
Not connected
Anode 1
Anode 3
Anode 5
Anode 7
Anode 9
Anode 11
Anode 13
Anode 15
Common Cathode
Common Cathode
PIN#
13
14
15
16
17
18
19
20
21
22
23
24
Electrical Connection
Not connected
Not connected
Anode 16
Anode 14
Anode 12
Anode 10
Anode 8
Anode 6
Anode 4
Anode 2
Common Cathode
Common Cathode
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VTA2516H-Rev.0-2013.07.12
