VSMP Series Resistors Vishay Precision Group VSMP Series Z-Foil Wraparound SMD Chip Resistors are available in case sizes 0603, 0805, and 1206, provide high rated power, excellent load life stability, and extremely low TCR. The VSMP Series Z-Foil Wraparound SMD Chip Resistor from Vishay Precision Group uses ultra high precision Bulk Metal®Z-foil technology that provides a significant reduction of the resistive element's sensitivity to ambient temperature variations (TCR) and to self-heating when power is applied (power coefficient).