Passives

Mission-critical resistor uses proprietary foil technology

1st June 2020
Mick Elliott

The new VPG Foil Resistors Model 303337 ultra-high precision military-and space-grade resistor is on sale at New Yorker Electronics.

As one of the industry’s most precise and stable precision resistors, the Model 303337 offers high-performance current sensing within mission-critical applications.

The surface mount resistor is suited for demanding military, aerospace, defense and space applications, such as when a precision resistor is required to quickly reach thermal equilibrium in circuits either requiring fast response times or experiencing rapid current changes. 

Within the military, aerospace, defense and space industries, typical applications include commercial and military avionics, switching linear power supplies, power amplifiers, power management systems, feedback circuits, measurement instrumentation and associated automatic test equipment. Other applications include precision high current-sensing and precision electronic scales.

They provide enhanced characteristic capabilities resulting in superior performance when compared with other resistor technologies.

The custom-made resistors are available in tolerances of: 0.1%, 0.2%, 0.25%, 0.5% and 1.0%, based on project need.

The Model 303337 produces a highly precise voltage that is directly proportional to measured current levels, with significantly reduced component sensitivity to applied power changes, including PCR and thermal resistance values.

The exclusive design of the Model 303337 incorporates VPG’s own proprietary Bulk Metal Z Foil resistive technology, along with a four-terminal Kelvin connection, for ultra-high precision current sensing and temperature stability to 3W.

Resistance range is 100mΩ to 200mΩ and short-time overload is 0.005% typical.

Other features include Temperature coefficient of resistance (TCR): 5 ppm/°C max. (–55°C to +125°C, +25°C ref.); solderable terminations; load-life stability to ±0.02% typical; resistance tolerance to ±0.1% and a power rating of 3W.

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