Model 406
Single Element
Pyroelectric IR Detector
With Source Follower
Manufactured under one or more of the following U.S. patents: 3,839,640 - 4,218,620 - 4,326,663 - 4,384,207 - 4,437,003 - 4,441,023 - 4,523,095
Model 406
contains a single lithium
tantalate sensing element and a JFET
source follower sealed into a standard
TO-5 transistor package with an optical
filter.
A patented element mounting tech-
nique is used to improve thermal time
constant and reduce effects of
microphony.
A source resistor is needed to set
the drain current and consequently the
operating parameters of the JFET. A
47kΩ or greater value resistor is
recommended.
.360
(9.14)
DIA
.320
(8.13)
DIA
ELEMENT
FILTER
.180 SQ APERTURE
(4.57)
.079
(2.0)
DIA
.125
(3.18)
NOM
.53
(13)
.190
(4.83)
Applications
•
Motion Sensing
•
Lighting Control
•
Intrusion Detection
•
Industrial Control
•
Gas Analysis
•
Heating/AC Control
•
Pyrometry
•
Low-power Laser Detection
•
Robotics
•
Instrumentation
DIMENSIONS IN INCHES (mm)
PINS CIRCLE .200 (5.08); LEAD DIA .017 (0.43)
Test
Conditions
ELTECdata
Reference
Characteristics
Detector Type
Element Size
Optical Bandwidth
Responsivity
Noise
NEP
D*
Operating Voltage
Operating Current
Offset Voltage
Output Impedance
R
S
406
Single
2.0
0.1 to 1,000
(min)
(typ)
(typ)
(max)
(typ)
(max)
(min)
(typ)
(min)
(max)
(min)
(max)
(min)
(max)
2100
2350
2.0
4.3
8.5 x 10
-10
2.0 x 10
-9
0.9 x 10
8
2.1 x 10
8
3
15
3
12
0.3
1.2
<R
S
0.25
0.08
-10 to +50
-55 to +125
Unit
mm, Dia
µm
V/W
µVrms/√Hz
W/√Hz
cm√Hz/W
VDC
µA
V
Ω
Hz
Hz
o
C
o
C
Various Filters
8 to 14
µm,
1Hz
1Hz
8 to 14
µm,
1Hz, 1Hz BW
8 to 14
µm,
1Hz, 1Hz BW
V+ to Gnd
R
S
=100kΩ
R
S
=100kΩ
101
100
100
104
(4.1.c)
104
(4.1.c)
106
Section B
102
G
D 1
2
S
V+
OUTPUT
+
R
L
6.5 x 10
10
3
Thermal Breakpoint f
Τ
(typ)
GROUND
Electrical Breakpoint f
e
(typ)
Recommended
Operating Temperature
Storage Temperature
R
L
=6.5 x 10
10
Ω
Functional
∆T<50C
o
/min
102
3
PIN DESIGNATIONS
1. V+
2. OUTPUT
3. GND/CASE
2
1
Output Protection
Do not exceed a maximum drain current of 50
µA
Characteristics at 25
o
C, with -3 filter, V+= 5 VDC, R
S
=100kΩ unless otherwise stated.
Data is established on a sample basis and is believed to be representative.
BOTTOM VIEW
FIELD OF VIEW
100k
0
30
o
FREQUENCY RESPONSE
Voltage Responsivity (V/W)
10k
1k
100
10
1
.1
.01
f
e
.1
fτ
1
10
100
Frequency (Hz)
1k
10k
10
10
Ω
10
9
Ω
10
8
Ω
10
7
Ω
Std.
6.5 x 10
10
Ω
30
o
60
o
60
o
90
o
100
50
Response (%)
50
90
o
100
For –3 filter only. For other filters, consider refrac-
tive index and thickness.
Symmetrical crystal gives same FOV in vertical and
horizontal planes.
The voltage response of this detector is dependent on the pulse
rate or equivalent frequency of input. The frequency response of the
detector can be linerarized by using a lower value resistor, but at the
expense of lower responsivity and a lower D*. Load resistor values
other than the standard 6.5 x 10
10
Ω
can be specified.
For best results, the following precautions and recommendations
should be observed. (See ELTECdata #101):
Mounting:
Avoid mechanical stresses on case and leads.
Soldering: Detectors must be hand soldered to minimize the
chance of destroying the internal components. Avoid machine or
hot air soldering. Leave a minimum lead length of .250 inch
(6.35mm). When soldering to detector leads, use a heat sink be-
tween the case and leads. Beware that the new RoHS compliant
solders require a higher soldering temperature making heat sinking
the detector extremely important.
Static Discharge:
Protect detectors from electro-static charges.
Thermal Shock:
Temperature changes and rate of change must be
o
kept to a minimum (<50C /min.) to prevent damage.
Noise:
As a resolution or lower information limit, noise is established
not only by the detector. Other noise sources are:
•
•
•
•
•
•
•
Radiated and conducted RF signals
Subsequent amplification or signal conditioning stages
Power supply noise
Components, such as high value resistors and capacitors (tantalum
and aluminum electrolytic)
Mechanical contacts and weak solder joints
Shock and vibration excited microphonics
Outside thermal influences on the detector other than the desired
infrared input, i.e. drafts
Transmission Characteristics of –3 Filter (HP7)
100
Transmittance (%)
80
60
40
20
All of these noise sources should be considered carefully when the
information signal is <1mV.
Light Leakage:
Slight sensitivity to visible light leaking through the
glass-to-metal seal on the base may be observed.
Optical Design:
Use of a detector with a filter in an optical system may
require consideration of the image displacement toward the filter. This
displacement (s) caused by the insertion of a planoparallel plate (filter
thickness = t; refractive index = N) is given by s = (t/N)(N-1).
5
6
7
8
9
10
11
12
13
14
15
16
Wavelength (µm)
75% Transmission Average
70% Transmission Absolute
Transmission below cutoff is <1%
NOTICE:
The information provided herein is believed to be reliable.
However, ELTEC Instruments, Inc. assumes no responsibility for
inaccuracies or omissions. Due to industry components being incor-
porated into ELTEC’s devices and ELTEC continually striving for
product improvement, specifications may change without notice.
For information on other standard filters available, refer
to ELTECdata #101.
Worldwide Eltec Product Distribution and Free Technical Support:
Silverlight Ltd., Glaernischstrasse 59, CH-8712 Staefa, Switzerland
info@silverlight.ch http://www.eltec.ch
©ELTEC INSTRUMENTS, INC. 03/2006
Printed in U.S.A. Form DS406 (E-03/2006)
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