Vishay has expanded its offering of Bulk Metal Foil and Z-Foil high-precision voltage divider resistors with the release of eight new and enhanced devices, including the new high-power VFD244/Z and conformally coated VSH144/Z, and the enhanced 300144/5 and 300144Z/5Z.
All new Foil devices offer a low typical TCR of ±2 ppm/°C from -55°C to +125°C, +25°C ref., while the Z-Foil devices feature TCR of ±0,05 ppm/°C typical from 0°C to + 60°C and ±0,2 ppm/°C typical from -55°C to +125°C, +25°C ref. The Z-Foil resistors provide PCR tracking (R due to self-heating) of ±5 ppm at rated power. The devices’ low TCR is combined with tight tolerances and high load-life stability values for precision instrumentation amplifiers, bridge networks and differential amplifiers in high-end medical, military, aerospace, automatic test and down-hole drilling equipment.
The new VFD244 and VFD244Z offer a high power rating up to 1 W at +70°C, divided proportionally between the two elements, over a working voltage of 350 V. The VFD244 features TCR tracking of 0,5 ppm/°C, while the VFD244Z provides tracking down to 0,1 ppm/°C. Both devices offer tolerance matching to ±0,005%, a load-life stability ratio of <0,005% at +70°C for 2000 hours at rated power, and a resistance range from 1 Ω to 150 kΩ.
The conformally coated VSH144 and VSH144Z feature tolerance matching to ±0,01 %, a load-life stability ratio of <0,01% at +70°C for 2000 hours at rated power, and a resistance range from 100 Ω to 20 kΩ. The VSH144 offers TCR tracking to 0,5 ppm/°C, while the VSH144Z provides tracking down to
0,1 ppm/°C. Both devices feature a power rating of 0,2 W at 70°C, divided proportionally between the two elements, over a maximum working voltage of 200 V.
The enhanced 300144/5 and 300144Z/5Z offer TCR tracking to 0,5 ppm/°C and 0,1 ppm/°C, respectively. Both Foil and Z-Foil devices provide tolerance matching to ±0,005 %, a load-life stability ratio of <0,005% at +70°C for 2000 hours at rated power, and a resistance range from 100 Ω to 20 kΩ. The devices offer a power rating of 0,2 W at 70°C, divided proportionally between the two elements, over a maximum working voltage of 200 V. The 300145/Z provides a pair of 300144/Z elements back to back in a single moulded package.
All the new divider resistors offer a low voltage coefficient of <0,1 ppm/V, current noise of <-40 dB, and thermal EMF of 0,05 μV/°C typical. The resistors provide a 1 ns rise time (effectively without ringing), and a non-inductive (<0,08 μH), non-capacitive design. The devices are available with standard tin/lead or lead-free terminations and can withstand electrostatic discharges up to 25 kV.
For more information contact Marian Ledgerwood, Future Electronics, +27 (0)21 421 8292, [email protected], www.futureelectronics.com
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