Model 406M39
Single Element Pyroelectric
IR Detector with Enhanced
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 406M39
pyroelectric
detector incorporates enhanced
voltage mode circuitry to provide
higher responsivity than tradition-
al source followers. The amount
of gain realized is dependent on
the value of the external source
resistor chosen. Typically, 100k
Ω
provides excellent perfor-
mance. For applications where a
single element detector is indi-
cated, Eltec recommends evalua-
tion of both the 406M39 and 406
units.
Like the Model 406, the Model
406M39 utilizes a 2 mm diameter
lithium tantalate crystal mounted
with Eltec’s patented loop
suspension. As regards interfac-
ing, it is recommended that the
signal be taken between the
source and ground (or artificial
ground) rather than with a "com-
mon" source circuit.
.360
(9.14)
DIA
ELEMENT
.320
(8.13)
DIA
FILTER
.180 SQ. APERTURE
(4.57)
.079
(2.0)
DIA
.125 NOM
(3.18)
.190
(4.83)
PIN CIRCLE .200 (5.08)
.53
(13)
LEAD DIA .017 (0.43)
DIMENSIONS IN INCHES (mm)
Characteristics
Detector Type
Element Size
Optical Bandwidth
Responsivity
Noise
(typ)
(typ)
(typ)
(typ)
(min)
(max)
(min)
(max)
(min)
(max)
406M39
Single
2.0
0.1 to 1,000
3,190
3.4
1.09 x 10
-9
1.72 x 10
8
5
10
8
30
0.8
3.0
<R
S
0.25
-40 to +70
-55 to +125
Unit
Test
Conditions
ELTECdata
Reference
mm, dia
µm
V/W
µVrms/√Hz
W/√Hz
cm√Hz/W
VDC
µA
V
Ω
Hz
o
C
o
C
Various Filters
8 to 14
µm,
10 Hz
10 Hz, 1 Hz BW
8 to 14
µm,
10 Hz, 1 Hz BW
8 to 14
µm,
10Hz, 1 Hz BW
V+ to Gnd
R
S
= 100k
Ω
R
S
= 100k
Ω
101
Applications
•
Motion Sensing
•
Lighting Control
•
Intrusion Detection
•
Industrial Control
•
Gas Analysis
•
Heating/AC Control
•
Pyrometry
•
Low-power Laser
NEP
D*
Operating Voltage
Operating Current
Offset Voltage
Output Impedance
100
100
104
(4.1.c)
104
(4.1.c)
106
Section B
Thermal Breakpoint f
T
(typ)
Recommended
Operating Temperature
Storage Temperature
Output Protection
102
Functional
∆T<50C
o
/min
Detection
•
Robotics
•
Instrumentation
Do not exceed a maximum drain current of 2 mA
Characteristics at: 25
o
C, with -3 filter, V+ = 5VDC, R
S
= 100k
Ω
unless otherwise stated.
Data is established on a sample basis and is believed to be representative.
FIELD OF VIEW
0
30
o
30
o
Thermal Shock:
Temperature changes and rate of change must be
kept to a minimum (<50Co/min.) to prevent damage.
Noise:
As a resolution or lower information limit, noise is established
not only by the detector. Other noise sources are:
60
o
60
o
•
•
•
•
•
•
•
Radiated and conducted RF signals
Subsequent amplification or signal conditioning stages
Power supply noise
Components, such as high value resistors and capacitors (tantalum
or 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
90
o
100
50
Response (%)
50
90
o
100
For -3 filter only. For other filters, consider refractive
index and thickness.
Symmetrical crystal gives same FOV in vertical and
horizontal planes.
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
base glass-to-metal seal may be observed.
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 electrostatic charges.
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).
D
G
1
2
1. V +
2. OUTPUT
S
R
L
5x10
10
Ω
3
R
S
Transmission Characteristics of -3 Filter (HP7)
100
3. GROUND
Transmittance (%)
80
60
40
3
PIN DESIGNATIONS
1. V+
2. OUTPUT
3. GND/CASE
2
20
1
BOTTOM VIEW
5
6
7
8
9
10
11
12
13
14
15
16
Wavelength (µm)
NOTICE:
The information provided herein is believed to be reli-
able. However, ELTEC Instruments, Inc. assumes no responsibility
for inaccuracies or omissions. Due to industry components being
incorporated into ELTEC’s devices and ELTEC continually striving for
product improvement, specifications may change without notice.
75% Transmission Average
70% Transmission Absolute
Transmission below cutoff is < 1%
For information on other standard filters available, refer
to ELTECdata # 101.
Worldwide Eltec Product Distribution and Free Technical Support:
Silverlight Ltd.,
Glaernischstr. 59, CH-8712 Staefa, Switzerland
Tel.+41 44 926 4362 Fax +41 44 926 6131 info@silverlight.ch
Online Product Orders and Datasheet Library on
http://www.eltec.ch
Performance data from production units of the Eltec Model 406M39-3 pyroelectric detectors
at 1, 10, 100, and 1,000 Hz modulation.
UNIT
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
NOTES:
SENSITIVITY
(V)
8.80E-01
8.40E-01
1.40E+00
1.80E+00
7.60E-01
5.80E-01
7.20E-01
9.20E-01
9.60E-01
7.60E-01
2.20E-01
1.90E-01
2.20E-01
2.30E-01
1.60E-01
1.30E-01
1.50E-01
1.90E-01
2.10E-01
1.70E-01
2.60E-02
2.10E-02
2.70E-02
2.70E-02
1.90E-02
1.50E-02
1.70E-02
2.50E-02
2.50E-02
2.10E-02
2.60E-03
2.60E-03
3.00E-03
3.20E-03
2.20E-03
1.80E-03
2.00E-03
2.40E-03
2.40E-03
2.20E-03
NOISE
(V)
4.2E-06
1.2E-06
2.6E-06
3.6E-06
4.2E-06
3.4E-06
3.0E-06
4.2E-06
2.8E-06
4.4E-06
3.8E-06
3.5E-06
3.2E-06
3.2E-06
3.6E-06
3.6E-06
3.6E-06
2.6E-06
3.0E-06
3.2E-06
7.0E-07
7.2E-07
1.5E-06
6.8E-07
1.3E-06
1.2E-06
6.0E-07
9.0E-07
8.0E-07
7.0E-07
3.2E-07
3.4E-07
1.2E-06
1.7E-07
1.1E-06
7.2E-07
1.6E-07
4.8E-07
2.8E-07
1.6E-07
RESPONSIVITY
(V/W)
1.60E+04
1.53E+04
2.55E+04
3.28E+04
1.39E+04
1.06E+04
1.31E+04
1.68E+04
1.75E+04
1.39E+04
4.01E+03
3.46E+03
4.01E+03
4.19E+03
2.92E+03
2.37E+03
2.73E+03
3.46E+03
3.83E+03
3.10E+03
4.74E+02
3.83E+02
4.92E+02
4.92E+02
3.46E+02
2.73E+02
3.10E+02
4.56E+02
4.56E+02
3.83E+02
5.99E+01
5.99E+01
6.91E+01
7.37E+01
5.07E+01
4.15E+01
4.61E+01
5.53E+01
5.53E+01
5.07E+01
NEP
(W/√Hz)
8.28E-10
2.48E-10
3.22E-10
3.47E-10
9.59E-10
1.02E-09
7.23E-10
7.92E-10
5.06E-10
1.00E-09
9.48E-10
1.01E-09
7.98E-10
7.63E-10
1.23E-09
1.52E-09
1.32E-09
7.51E-10
7.84E-10
1.03E-09
1.48E-09
1.88E-09
3.05E-09
1.38E-09
3.75E-09
4.39E-09
1.94E-09
1.98E-09
1.76E-09
1.83E-09
5.34E-09
5.68E-09
1.74E-08
2.31E-09
2.17E-08
1.74E-08
3.47E-09
8.68E-09
5.07E-09
3.16E-09
D*
(cm√Hz/W)
2.14E+08
7.15E+08
5.50E+08
5.11E+08
1.85E+08
1.74E+08
2.45E+08
2.24E+08
3.50E+08
1.76E+08
1.87E+08
1.75E+08
2.22E+08
2.32E+08
1.44E+08
1.17E+08
1.35E+08
2.36E+08
2.26E+08
1.72E+08
1.20E+08
9.42E+07
5.81E+07
1.28E+08
4.72E+07
4.04E+07
9.15E+07
8.97E+07
1.01E+08
9.69E+07
3.32E+07
3.12E+07
1.02E+07
7.68E+07
8.16E+06
1.02E+07
5.10E+07
2.04E+07
3.50E+07
5.61E+07
NOTE
I
I
I
I
I
I
I
I
I
I
II
II
II
II
II
II
II
II
II
II
III
III
III
III
III
III
III
III
III
III
IV
IV
IV
IV
IV
IV
IV
IV
IV
IV
I)
7.6 m to 14.6 m, 500K, 1 Hz, 1Hz BW, Measured with a 0.1 Hz BW and normalized to 1 Hz.
II)
7.6 m to 14.6 m, 500K, 10 Hz, 1Hz BW
III)
7.6 m to 14.6 m, 500K, 100 Hz, 1Hz BW
IV)
7.6 m to 14.6 m, 500K, 1000 Hz, 1Hz BW
Supply Voltage: + 8 V DC at 25
o
C, 100,000 Ohms Source Resistor
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