VH HermeticVH Hermetic Hermetically Sealed High Hermetically Sealed High PrPrecision Bulk Metal Foil Technology ecision Aer ospace Resistors Bulk Metal Foil Technology Aerospace Resistors TCR of 1 ppm/C, Tolerance to 0.005% and Load-Life Stability of 0.005% FEATURES Temperature coefficient of resistance (TCR): 55C to +125C, + 25 C ref.: VH102K: 1 ppm/C typical VHS102: 2 ppm/C typical VHS555: 5 ppm/C maximum Any value at any Tolerance: to 0.005% tolerance available Resistance range: 1 to 150 k (higher or lower within resistance range resistance values are available Load-life stability: 0.005% (70C for 2000 h at rated The VH series of resistors is the hermetic version of power) several molded S series devices. Hermetic sealing eliminates the ingress of both oxygen, which degrades Electrostatic discharge (ESD) >25 000 V resistors over long periods, and moisture which degrades Power rating: 0.6 W at +70C 0.3 W at +125C resistors more quickly. These parts are made with glass Non-inductive, non-capacitive design to metal seal enclosures employing Kovar eyelets which Non hot spot design allow the copper leads to pass through the enclosure to minimize the thermal EMF from the lead junctions. Rubber Rise time: 1.0 ns without ringing fill between the metal housing and resistance element Current noise: <40 dB acts both as a mechanical damper and thermal transfer Thermal EMF: 0.05 V/C typical path. Voltage coefficient: <0.1 ppm/V VHS102 and VH102K are the hermetically-sealed Non-inductive: <0.08 H counterpart of the S102C and S102K high-performance Terminal finishes available: lead (Pb)-free tin/lead alloy molded resistors. VHS555 is the hermetically-sealed version of the S555, MIL style RNC90Y. For better performance, please see VH102Z datasheet INTRODUCTION Table 1Model Selection Standard Resistance Resistance Maximum (1) (3)(4) Tolerance Ambient Power Rating Model Range Working (%) Number (2) () Voltage Tightest Loosest at +70C at +125C 30.1 to 150k 0.005 (5) VH102K 20 to <30.1 0.01 10 to <20 0.05 1.0 5 to <10 0.10 VHS102 1 to <5 0.25 300 0.6 W 0.3 W 30.1 to 150k 0.005 16.2 to <30.1 0.05 (6) VHS555 1.0 4.99 to <16.2 0.10 1 to <4.99 0.25 Notes: (1) Standard resistance tolerance: 0.005% 0.01% 0.02% 0.05% 0.1% 0.25% 0.5% 1.0%. (2) Not to exceed power rating of resistor. (3) See Figure 2. (4) Above 100 k, VHS102 power is derated to 0.4 W at +70C, and 0.2 W at +125C. (5) Available from 1 to 100 k only. (6) Contains RNC90Y inside (4.99 to 121 k). * Pb containing terminations are not RoHS compliant, exemptions may apply 4086-EN4086-EN For any questions, contact www.foilresistors.com Rev 15-Sep-2021Rev 15-Sep-2021 foil vpgsensors.com 1VH Hermetic Figure 1Standard Imprinting and Dimensions Ave. Front View Rear View Dimensions Weight L W Resistance Value Code Parameter inches mm g VFR 100R01 Tolerance XXXX 0.01 % W 0.185 max 4.70 max H VHS555 Model XXXX Serial No. Number (Optional Marking) L 0.435 max 11.05 max (1) ST H 0.430 max 10.92 max Date Code LL 1.4 08 10 LL 1 0.125 25.4 3.18 Year Week (2) LS LS 0.150 0.010 3.81 0.25 Lead Material 22 AWG Round Solder Coated Copper ST 0.095 max 2.41 max Notes (1) 0.375 H available. (2) 0.200 (5.08 mm) lead spacing available (except VHS555)specify VH102J (S102C type), VH102L (S102K type). Table 2Tolerance and TCR vs. Resistance Figure 2Trimming to Values (conceptual illustration) Resistance Typical TCR and Max. Spread Resistor Value 55C to +125C, +25C ref. () (ppm/C) Interloop capacitance VHS102 80 to 150k 2 2.5 Current path reduction before trimming VH102K 80 to 100k 1 2.5 in series VHS102 2 3.5 50 to <80 Mutual Current path after trimming VH102K 1 3.5 inductance reduction VHS102 2 4.5 Trimming process 1 to <50 due to change removes this material VH102K 1 4.5 in current from shorting strip area direction changing current path and increasing resistance Figure 3Power Derating Curve Foil shown in black, etched spaces in white Note 55C +70C Double Rated Power To acquire a precision resistance value, the Bulk Metal Foil +200 chip is trimmed by selectively removing built-in shorting bars. +175 To increase the resistance in known increments, marked areas are cut, producing progressively smaller increases in +150 resistance. This method reduces the effect of hot spots and improves the long-term stability of Bulk Metal Foil resistors. +125 Rated Power +100 +75 +50 +25 0 75 50 25 0 +25 +50 +75 +100 +125 +150 +175 +200 Ambient Temperature (C) www.foilresistors.com For any questions, contact 4086-EN 2 foil vpgsensors.com Rev 15-Sep-2021 Percent of Rated Power at +125C