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| Figure 2. Temperature
Resistance Characteristics |
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SDT101
Series
SDT101 series is low in price compared with SDT310
series which are conformed with JIS. KOA has shipped
them for about 30 years. The approximate expression
of temperature resistance characteristics has been
provided and it can be used for circuit calculation
at designing. The element, which is columnar, has
no directionality. They perform excellent as wind-velocity
sensors or as flow sensors utilizing self-heating
(Photo 1).
The SDT101 series are mainly used for the temperature
compensation of load cells, wind-velocity sensors
utilizing self-heating, the cold junction compensation
of thermo-couples, the flow measurement of electronic
fuel injector of automotives, and the compensation
of each temperature sensor.
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Photo 1. SDT101, SDT310 and SDT73 series
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| SDT310
Series
SDT310
series are small (3.0 x 2.0mm), and can generate
resistance value of 1kĦ, with excellent
response and linearity. The SDT310LT
model among these series, allows external
lead wire to be soldered easily. The SDT310MT
realizes class B at temperature of 650C degrees,
which could be measured only by thermo-couples
or high-priced wire wound type. Main applications
of SDT310
series are, high-precision measurement of
temperature, the cold junction temperature
compensation of thermo-couples, the temperature
compensation of control boards, and the temperature
control of electronic equipment.
SDT73
Series
Like other SMD components, SDT73
series can reduce the cost at mounting because
it can be mounted by automatic mounting machine.
Custom-product SDT732BX
is compatible with wire bonding. Therefore,
it is suitable for temperature compensation
in high-precision sensor modules.
The SDT732BX
model enables the maximum operating temperature
of 400C degrees, so they
are able to be used even in high-temperature
environment. SDT73
series are mainly used for the cold junction
compensation of thermo-couples and the temperature
compensation of optical communication modules.
ST
Series
ST series consists of customized products
by e.x. enclosing SDT series resistors
into protecting tube, or extending the lead
wire or mounting on board. An example of the
ST series is shown in Photo 2.
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| Photo 2.
ST series |
KOA Corp. will provide compact, high-precision,
and high-temperature products which are available
for wide range of the measurement temperature.
KOA will expand their product lineups to meet
flexibly with customers' requirements. |
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Application Notes
Brush up your circuit
Basic Knowledge
