VPG’s SMR3Z1 foil resistor delivers low EMF, low TCR, low noise, and long-term stability

By Warren Miller, contributing writer

VPG Foil
Resistors, a product group of Vishay Precision Group, Inc., launched its new SMR3Z1 high-precision molded
surface-mount resistor featuring Z1 Foil Technology and flexible terminations. The SMR3Z1 features
low thermal electromotive force (EMF), a low temperature coefficient of
resistance (TCR), low noise, and a non-measurable voltage coefficient.

The Z1 Foil
Technology delivers greater stability and protection against harsh
environmental conditions for applications such as medical, industrial, military,
aeronautics, and deep-sea and space exploration. A solid alloy is matched to
the ceramic substrate using polyimide bonding, providing the resistor with “superior”
adhesion strength and improved protection against moisture.

These properties,
coupled with its low absolute TCR, make the SMR3Z1 well-suited for applications
that must withstand high temperatures and radiation-rich environments such as
down-hole exploration and well logging and deep-sea underwater repeaters in
transoceanic communications, said VPG.

VPG Foil Resistors offer a range of resistance values and can be manufactured
with any value within that range at any tolerance and at no additional cost or
delay. The SMR3Z1’s molded package design, coupled with its flexible
terminations, reduces stress transference and decreases the likelihood of the
printed circuit board cracking or delaminating due to thermal shock.