In the past, limited options have existed for applications requiring automotive grade high voltage resistors. If the circuit requirements also demand high precision, finding suitable resistors may be even more difficult.  

Currently most general-purpose thick film chip resistors in all markets utilise exemption 7c-1 for RoHS compliance.

Stackpole has expanded its CSRF1225 foil on ceramic carrier series to include a smaller version.

RNHT automotive grade high-temperature precision thin film chip resistors are now available from Stackpole.

Designing high power products that require high efficiency performance can be challenging.

Stackpole’s RNCF offers 0.01% resistance tolerances and 2 ppm TCR for multiple application scenarios.

Stackpole have launched high power thin film anti-surge chip resistors to deliver high power and maintain accuracy.

Since the Restriction of Hazardous Substances Directive (RoHS) went into effect on July 1st, 2006, most thick film chip resistors have complied with the directive through exemption 7(c)-I, which allows for "...lead in a glass or ceramic...or in a glass or ceramic matrix compound." 

High voltage applications frequently require high resistance value resistors with the ability to handle high working and overload voltages.

Stackpole's metal alloy current sense chip resistors offer efficiency and accuracy for high-current power supplies.

Stackpole’s HCS raised element SMD high current shunts offer up to 10W power ratings.

Applications for precision resistors are becoming more common. For those applications with high power requirements, this can be challenging as many of these devices require lower power ratings for high precision.

Current sensing for motor control applications often requires robust current handling and the lowest possible PCB temperatures. Unfortunately, high current or overload current handling typically means higher PCB temperatures.

High voltage applications such as HVAC controls, appliance and white goods controls, metering, automation, medical devices, digital storage, and surge protection devices typically require resistors with high working voltage that may be challenging to find. If the applications are low current or low energy, film resistors are an ideal technology.

Precision electronics applications such as instrumentation, medical devices, avionics, and aerospace not only require resistors with tight tolerance and low TCR, but also environmental stability. When these applications also require pulse handling, finding the right resistor can be challenging because precision thin film resistors are not typically known for their pulse handling.

Applications such as industrial and automotive power control require low resistance values, high power ratings, and resistance to sulfur contamination. Stackpole state. Thick film chip resistors are not typically sulfur resistant, especially in higher power ratings, and many high-power resistor series do not offer values below 1ohm.

High power applications requiring resistors with power ratings above 1W can be challenging. For ceramic based chip resistors, this generally requires chip sizes of 2010 or larger which are susceptible to cracking and solder joint failure.

High reliability chip resistors can be more difficult to find and even more so when there are pulse handling requirements.

MELF resistors are known for their thermal characteristics and their environmental and electrical stability.

Current sensing for a wide range of products and applications requires both low and high resistance values with high stability, reliability, and low TCR.