How do Chip resistors compare to Metal/Carbon film resistors in terms of Noise immunity and Reactance ?
Apart from size does chip resistor offer any other advantages ?
- posted
19 years ago
About Chip Resistors
Loading thread data ...
- Vote on answer
- posted
19 years ago
You can buy metal film chip resistors and thick film chip resistors. They generally have less reactance than leaded resistors. For lowest excess noise in the presence of DC bias, metal film resistors are still best, whether in chip or leaded form.
When mounted, their parasitics are lower.
-- --Larry Brasfield email: donotspam_larry_brasfield@hotmail.com Above views may belong only to me.
- Vote on answer
- posted
19 years ago
terms
If I might add something to the above, thick film resistors have worse temeperature coefficients (although this can be mitigated by using more expensive inks). Also, they have a tendency to microcracking. When the laser cuts through the fired film while laser trimming, thick film tends to develop microscopic cracks running perpendicular to the cut. Under load or thermal cycling, these microscopic cracks can grow, permanently increasing the resistance. This limits their usefulness generally to about 0.5% tolerance at best. This makes thin film a better choice for precision chip resistors.
On the plus side, in addition to lower inductance, thick film chip resistors are the least expensive, and automated SMT pick and place is far less expensive than axial insertion and cut/clinch.
Good luck Chris