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PDF VT43N3 Data sheet ( Hoja de datos )

Número de pieza VT43N3
Descripción Photoconductive Cells and Analog Optoisolators (Vactrols)
Fabricantes PerkinElmer Optoelectronics 
Logotipo PerkinElmer Optoelectronics Logotipo



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Lighting
Optoelectronics
Imaging
Telecom
Sensors
Detectors and Sensors
Photoconductive Cells and
Analog Optoisolators (Vactrols®)
Specialty Lighting
Digital Imaging
Telecom
Sensors
.

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VT43N3 pdf
Custom and Semi-Custom Devices
Upon request, and where sufficient quantities are involved,
PerkinElmer Optoelectronics will test standard parts to your
unique set of specifications. The advantage of testing parts
under actual operating conditions is predictable performance in
the application.
PerkinElmer offers a broad line of standard photodiodes in a
wide variety of packages and sensitivities. Nevertheless, some
applications demand a totally custom device. Recognizing this
real need, PerkinElmer’s engineering, research, and sales
departments are geared for working with the customer from
initial concept through design, prototype, and volume production.
A custom design usually required the commitment of valuable
resources. PerkinElmer reviews requests for custom devices on
a case by case basis and reserves the right to decide if the
business potential warrants the undertaking of such a project.
The customer may be asked to share in the expense of
development.
PerkinElmer has designed and fabricated custom products for
many companies. PerkinElmer’s staff can work closely with the
customer and protect proprietary information. A custom design
usually required the commitment of valuable resources.
PerkinElmer reviews requests for custom devices on a case by
case basis and reserves the right to decide if the business
potential warrants the undertaking of such a project. The
customer may be asked to share in the expense of development.
PerkinElmer has designed and fabricated custom products for
many companies. PerkinElmer’s staff can work closely with the
customer and protect proprietary information.
Your inquiries to PerkinElmer should include electrical,
environmental, and mechanical requirements. Also, information
on anticipated volumes, price objectives, and lead times is
helpful since these often determine the choices of design and
tooling.
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VT43N3 arduino
Selecting a Photocell
Slope Characteristics
Plots of the resistance for the photocells listed in this catalog versus
light intensity result in a series of curves with characteristically different
slopes. This is an important characteristic of photocells because in
many applications not only is the absolute value of resistance at a
given light level of concern but also the value of the resistance as the
light source is varied. One way to specify this relationship is by the use
of parameter (gamma) which is defined as a straight line passing
through two specific points on the resistance curve. The two points
used by PerkinElmer to define γ are 10 lux (0.93 fc) and 100 lux (9.3
fc).
γ = L---o-L--g-o--g-R----aa----––----LL---oo---bg----bR----b-
= -L--o--L-g-o--(-g--R-(---ab----⁄⁄--Ra---)-b----)
Applications for photocells are of one of two categories: digital or
analog. For the digital or ON-OFF types of applications such as flame
detectors, cells with steep slopes to their resistance versus light
intensity curves are appropriate. For analog or measurement types of
applications such as exposure controls for cameras, cells with shallow
slopes might be better suited.
Resistance Tolerance
The sensitivity of a photocell is defined as its resistance at a specific
level of illumination. Since no two photocells are exactly alike,
sensitivity is stated as a typical resistance value plus an allowable
tolerance. Both the value of resistance and its tolerance are specified
for only one light level. For moderate excursions from this specified
light level the tolerance level remain more or less constant. However,
when the light level the tolerance level remain more or less constant.
However, when the light level is decades larger or smaller than the
reference level the tolerance can differ considerably.
As the light level decreases, the spread in the tolerance level
increases. For increasing light levels the resistance tolerance will
tighten.
Likewise, for dual element photocells the matching factor, which is
defined as the ratio of the resistance of between elements, will
increase with decreasing light level.
Dual Element Photocell Typical Matching Ratios
0.01 fc
0.1 fc
1.0 fc
10 fc
100 fc
0.63 – 1.39 0.74 – 1.27 0.75 – 1.25 0.76 – 1.20 0.77 – 1.23
Dark Resistance
As the name implies, the dark resistance is the resistance of the cell
under zero illumination lighting conditions. In some applications this
can be very important since the dark resistance defines what
maximum “leakage current” can be expected when a given voltage is
applied across the cell. Too high a leakage current could lead to false
triggering in some applications.
The dark resistance is often defined as the minimum resistance that
can be expected 5 seconds after the cell has been removed from a
light intensity of 2 fc. Typical values for dark resistance tend to be in the
500k ohm to 20M ohm range.
Temperature Coefficient of Resistance.
Each type of photoconductive material has its own resistance versus
temperature characteristic. Additionally, the temperature coefficients of
photoconductors are also dependent on the light level the cells are
operating at.
From the curves of the various types of materials it is apparent that the
temperature coefficient is an inverse funstin of light level. Thus, in order
to minimize temperature problems it is desirable to have the cell
operating at the highest light level possible.
Speed of Response
Speed of response is a measure of the speed at which a photocell
responds to a change from light-to-dark or from dark-to-light. The rise
time is defined as the time necessary for the light conductance of the
photocell to reach 1-1/e (or about 63%) of its final value.
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