Download PM_Isabellenhütte_BVN_eng

Isabellenhütte presents an innovation
The BVN precision resistor uses 25 per cent less space and is ideal for
installation on DCB ceramics
Isabellenhütte has added the new BVN four-terminal resistor to its measuring resistor
range. It is exceptional due to its small size of between 3.3 and 4 millimetres plus its
extremely low temperature coefficient of less than 50 ppm/K. “It is difficult to produce
low-ohmic resistors with values of less than 1 mOhm that also have good temperature
coefficients. The BVN has achieved it – together with a size that is 25 per cent smaller
than other resistors with similar performance,” confirmed Thomas Otto from the
Application Management division at Isabellenhütte. The BVN can handle continuous
loads of up to 80 A with a resistance value of 0.5 mOhm. Overall, it has excellent
stability over long periods and is suitable for a broad temperature range between -55
and 170 °C as well as for soldering temperatures of up to 350 °C. The BVN can also be
mounted on a variety of circuit boards and substrates: It can be mounted on the
traditional FR4 material used in most standard applications and on DCB ceramics for
high-current applications.
Small, precise, temperature independent
The BVN is suitable for numerous automobile and industrial applications: for frequency
converters in drive technology and power modules in inverters, as measuring resistor in
power hybrids, and for high-current applications in automobile technology. The
components are ideally suited to use on ceramic substrates thanks to their excellent
thermal-cycling resistance and the minimal footprint in high-current applications (control
electronics, e.g. power steering). Thomas Otto explains: “Each square millimetre saved
in construction equals cost savings for the manufacturer.” The BVN combines small
mechanical dimensions with high measuring accuracy and low temperature
dependence.
Technical specifications of the BVN:
Resistance values
0.5 mOhm
|
Tolerance
1/5%
Temperature coefficient (20 – 60 °C)
< 50 ppm/K
Temperature range
-55 to +170 °C
Load capacity
3W
Inner thermal resistance
< 8 K/W
Inductance
< 3 nH
Stability (nominal load)
Deviation after 2,000 hrs.
TK = contact point temperature
< 0.5 % (TK = 100 °C)
< 1.0 % (TK = 130 °C)
|
1 mOhm
< 13 K/W