Thick Film Resistors PCB also calls Printed Carbon Resistor PCB , which resistor value can be from 10 ohms/square to 100K ohms/square (Resistor value), The maximum resistor value can reach 100M ohm with tolerance +/-10%, The Thick Film Resistor is to be printed on an etched copper outter layer and cured in a standard convection oven, infra-red furnace, or a thermal belt furnace. Then using Laser trimming to adjust the resistance to achieve tight tolerances.
For the designs with potentiometer functions, the surface of the thick film resistor usually has a sliding wiper, Panda PCB also can control the linear tolerance of the resistance within +/-1% to get a balanced voltage changing.
This Thick Film Resistor PCB solution makes resistors embedded into printed circuit boards more complex, But more versatile than the selection of surface mounted passive components. This frees up the surface space for the placement of more active components that increase functionality.
Thick Film Resistor PCB improved the process of embedded resistors by eliminating the needs for special termination treatment, such as immersion silver,or silver palladium, gold palladium, Also speed up the laser trimming process with tighter TCR’s; and increase the reliability performance with a stable binder system. On the other hand, Thick Film Resistor PCB values currently available for testing show good adhesion to a clean copper surface. This eliminates the need for silver immersion, or silver palladium, gold palladium which presents a cost savings as well as reduces concerns of silver migration.
In a word, Thick Film Resistor PCB Technology can be used to deposit any combination of fixed resistors, switches, sensors, potentiometer tracks and conductors onto virtually any size, shape or PCB form. Thick Film Resistor PCB Technology is ideal for three-wire voltage-divider (potentiometer) designs. Here, Panda PCB offers in-process calibration and resistive (ohmic) process control, allowing for tight matching within lots and high precision voltage ratios between key points in the circuit. Once screened and cured, these resistive tracks can be individually laser trimmed to obtain very accurate tolerances in high volume.
By the way, We also provided custom Multi-Wire Wipers (contacts) for customer if needs, we can manufacture the wipers according to customer's drawing design requirements or specification. More information about wipers , Please refer to Multi-Wire Wipers.