TT Electronics has expanded its high-reliability CR and HR series
with two resistor types in the 0603 size. These thick-film chip resistors
target compact circuits in aerospace, military, communications, medical, and
industrial applications.

Both resistor series’ thick-film elements claim a higher surge
tolerance than thin-film, which also improves reliability, said TT Electronics.
The CR0603 resistors are available in values from 1R0 to 10M with tolerance
values down to 0.1%. CECC 40401-008 screened parts are optionally available. Applications
include sub-sea repeaters, mainframe systems, and hi-rel systems.

The resistors’ optional screened release (CECC) enhances
reliability, reduces field failures, and provides low demonstrated FIT rates
compared to competing commodity products, according to the company. Seven sizes
are available from 0503 up to 2512. The CECC-approved resistors are also
available as shorting links.

The HR0603 resistors are available in values from 10M to 20G with
tolerance values down to 5%. Specific applications include high gain
amplifiers, infra-red and glass break sensors, and smoke, gas, and medical
monitors. The HR series’ high-ohmic-value resistors offer enhanced reliability
and reduced field failures compared to series-connected, multi-chip solutions
and deliver a low voltage coefficient of resistance. Custom designs and sizes
are available.

The solder terminations for both series have a nickel barrier
layer that ensures excellent “leach” resistance properties and solderability,
and they will withstand immersion in solder at 260°C for 30 seconds. Both series
also include gold wire bond or solder terminations. An ambient temperature
range of –55°C to 155°C is specified for both ranges. All relevant marking
information is recorded on the primary package or reel.

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