Y0076V0312BA0L

The model VHD144 are hermetic versions of the molded divider 300144. The difference between them is that the VHD144 has the full power rating of the 300144 while the VHD200 has a reduced power rating in exchange for a full spectrum of values without the time delay for new artwork (for values not yet tooled) and without NRE charges. Further, the VHD200 is oil filled, providing additional moisture protection and allowing considerable improvement in ratio match and TCR tracking.

The value of the hermetic enclosure over the molded part is in the long term performance. Moisture and oxygen both pass through plastic and both contribute to long term degradation of resistive elements. Divider ratios of 1:1 are not as likely to lose ratio with time but as the ratios become greater, the imbalance of power has more effect on the ratio stability and the hermetic enclosure becomes of paramount importance.

• Temperature coefficient of resistance (TCR):
  • Absolute: ± 2 ppm/°C typical (- 55 °C to + 125 C, 25 °C ref.)
  • Tracking: 0.1 ppm/°C typical
• Tolerance:
  • absolute to ± 0.005 %
  • match to 0.001 %
• Power rating:
  • VHD144 0.2 W at 70 °C
  • VHD200 0.1 W at 70 °C
• Ratio stability: < 0.001 % (10 ppm) 0.2 W at 70 °C for 2000 h
• Electrostatic discharge (ESD) above 25 000 V
• Non inductive, non capacitive design
• Rise time: 1 ns without ringing
• Current noise: < - 40 dB
• Thermal EMF: 0.05 µV/°C typical
• Voltage coefficient: < 0.1 ppm/V
• Non inductive: 0.08 µH
• Non hot spot design
• Terminal finishes available:
  • lead (Pb)-free
  • tin/lead alloy
• Any value available within resistance range (e.g. 1K234)