High precision SMD resistors are 0.05% and ±2.5ppm/°C

Author: EIS Release Date: Aug 23, 2021

Vishay created precision resistors with 0.05% tolerance and a temperature coefficient of ±2.5ppm/°C.

 

VPG_Foil_Z1_flip chip resistor photo

They are in the FRFS0402 Series, based on ‘Z1 Foil’ precision foil resistor elements by Vishay Precision Group. As well as 0.05%, four other tolerance ratings are available: 0.1, 0.25, 0.5 and 1%.

 

Load life stability is typically ±0.01% (70°C, 2000 h, rated power).

 

 

Vishay Z-foil resistor trimmingIn manufacture, the firm’s bulk metal foil chips are trimmed by selectively removing built-in shorting bars (left). To increase the resistance in known increments, marked areas are cut, producing progressively smaller increases in resistance – a method claimed to reduce the effect of hot spots and to improve long-term stability.

 

 

 

“The FRFS has a non-inductive, non-capacitive design,” according to New Yorker Electronics, which is stocking the parts. “The flip-chip configuration provides a substantial PCB space saving as compared to a surface mount chip with wraparound terminations. Vishay Precision Group considers it to be the smallest SMD resistor with real ultra high-precision performance.” Footprint is 1.1 x 0.56mm.

 

VPG_Foil_Z1_Flip_Chip_Resistor-stand-offStand-off construction (right) allows visual inspection of the solder connection after mounting. “In addition, this construction increases the rated power, due to the increased heat dissipation through the thick terminals,” said New Yorker.

 

Values from 170Ω to 1kΩ are available, rated at 75mW, with derating required above ~70°C.

 

Terminals are solderable gold-finished, intended for use upto, or even above, 200°C. That said, the ±2.5ppm/°C specification is over -55 to +125°C (+25°C ref).

 

Applications are foreseen in 5G, fibre optics, data transmission networks or high temperature sensors.

 

The data sheet is currently preliminary. Prototype quantities are available through New Yorker Electronics.