Aerospace, Military and Defence
Moisture resistance increases resistor stability
The latest developments in precision resistor technology add protection against moisture to increase stability in harsh environments, explains Roger Tall, director and product specialist, Charcroft
Z1 technology adds higher moisture resistance for resistors
I
t can be a tough life for a resistor in aerospace and defence equipment. Not only does the resistor need to deliver extreme reliability, but it must also continue to be reliable even when the operating conditions are harsh. These conditions can include high levels of shock and vibration, high altitude, environments with high levels of humidity, moisture or even water.
Resistors are used in critical as well as sub- critical systems, and the ability to withstand the effects of moisture is essential. The resistor must maintain precise operation and not be degraded by the presence of moisture, or corroded by high humidity. If corrosion impacts the structural quality of the resistor, the failure-free operation of the circuit or sub-system can be put at risk and the cost of maintenance or replacement increased.
20 July/August 2023 Components in Electronics
Wrap-around Z1 chip resistors with screen/test flow compliant to MIL-PRF-55342
Moisture can enter the body of a resistor in a number of ways. Entry can be through porous material, or during the manufacturing process. Temperature cycling can also allow moisture to affect the performance of the resistor. The way in which a resistor is
manufactured has a significant effect on the ability of the resistor to withstand moisture, and on the long-term reliability and lifespan of the resistor.
Built to resist moisture
Z1 foil technology was first developed in 2014 by VPG Foil Resistors, but has continued to evolve to improve the ability of the resistor to operate reliably in the presence of humidity or moisture.
The strength of the adhesive used to hold the foil against the flat substrate is important. So Z1 technology uses a more advanced poly-
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