RP0805BRD07220KL

The RP0805BRD07220KL is a 220kΩ automotive-grade high-precision thin film chip resistor from Yageo’s RP series — the company’s premier precision resistor line designed to meet the most demanding accuracy and reliability requirements of automotive, industrial, and medical applications.

With an ultra-tight ±0.1% resistance tolerance and an exceptionally low ±25ppm/°C temperature coefficient, this resistor represents the upper echelon of surface-mount resistor precision. To put these specifications in perspective: over a 100°C temperature swing, the total resistance change is only ±0.25% — combined with the initial ±0.1% tolerance, the worst-case total error remains well under 0.5%, making it suitable for precision measurement and sensing applications where accuracy is paramount.

Manufactured using advanced sputtering thin film technology on a high-purity alumina substrate, the RP series resistive element is a precisely controlled metallic alloy film deposited under vacuum conditions. This process produces a dense, uniform resistive layer with outstanding long-term stability and low noise characteristics. Advanced laser trimming achieves the ±0.1% tolerance with high precision.

A key feature of the RP series is its anti-sulfur termination design. Standard chip resistors using silver-based outer electrodes can suffer from silver sulfide migration when exposed to sulfur-containing environments (common in industrial settings, automotive under-hood applications, and certain geographic regions), leading to resistance drift and eventual open-circuit failure. The RP series addresses this with a specially engineered electrode structure that eliminates silver from the termination path, providing robust resistance to sulfur contamination.

Qualified to the AEC-Q200 automotive standard and with moisture-resistant construction, the RP0805BRD07220KL is designed for reliable operation across the full -55°C to +155°C temperature range. It is supplied on 7-inch paper tape reels (code 07) with 5,000 pieces per reel, fully RoHS compliant and halogen-free, ready for high-volume automated SMT assembly.

A high-precision thin film resistor operates by creating a precisely controlled resistance path through a sputter-deposited metallic alloy film on a ceramic substrate, with manufacturing tolerances and material choices optimized for maximum accuracy and stability.

The RP0805BRD07220KL begins its manufacturing process with a high-purity 96% alumina (Al2O3) ceramic substrate chosen for its excellent thermal conductivity, electrical insulation, and dimensional stability. The substrate surface is carefully polished to an extremely smooth finish — critical for achieving uniform thin film deposition and precise resistance control.

The resistive film is deposited using DC magnetron sputtering, a vacuum deposition technique where high-energy plasma ions bombard a target of the resistive alloy (typically a nickel-chromium based precision alloy optimized for low TCR). The sputtered atoms travel through the vacuum and condense on the substrate, building up a thin, dense, highly uniform film layer. The film thickness is precisely controlled by deposition time and power, typically resulting in film thicknesses in the range of hundreds to thousands of angstroms.

Following deposition, the resistor is patterned using photolithography — applying a photoresist layer, exposing it through a precision photomask, and developing to create the desired resistor geometry. The unwanted resistive film is then etched away using wet or dry etching processes, leaving behind the precisely defined resistor element.

Laser trimming is performed to achieve the ultra-tight ±0.1% tolerance. A focused laser beam precisely ablates material from the resistor film, typically in an L-shaped or straight cut pattern, carefully increasing the resistance until it falls within the target range. The trimming process is monitored in real-time with high-precision resistance measurement equipment, stopping automatically when the target value is reached.

For the ±25ppm/°C TCR specification, the resistive alloy composition is carefully formulated and the deposition parameters are precisely controlled. TCR in metallic films arises from the temperature dependence of electron scattering — as temperature increases, increased lattice vibration scatters electrons more, increasing resistance (positive TCR). By engineering the alloy composition and film structure, the TCR can be minimized and tightly controlled.

A multilayer passivation stack — typically including silicon nitride (SiN) and/or silicon dioxide (SiO2) layers deposited by PECVD — is applied to protect the resistor element. This passivation is critical for maintaining the ±0.1% tolerance and ±25ppm/°C TCR over the resistor’s lifetime by preventing moisture ingress and environmental contamination.

The anti-sulfur termination design replaces the silver-based outer electrode with a sulfur-resistant electrode structure. Multiple metal layers — including titanium-tungsten (TiW) or chrome adhesion layers, nickel barrier layers, and a tin outer plating — ensure both excellent solderability and complete immunity to sulfur-induced corrosion and resistance drift.

When current flows through the precision thin film resistor, the uniform metallic film provides a consistent resistance with very low noise (because there are no grain boundary scattering issues common in thick film materials). The 0.125W power rating at 70°C means the resistor can safely dissipate up to an eighth of a watt continuously, with power derating linearly to zero at 155°C maximum operating temperature.

Note: The RP0805BRD07220KL is a non-polarized passive component. Either terminal can be connected to either side of the circuit. The 0805 package provides a larger resistor element area compared to 0603, contributing to higher power rating (150V working voltage) and improved stability.

• Automotive ADAS systems — camera, radar, and LiDAR sensor interfaces
• Battery Management Systems (BMS) voltage and current sensing
• Precision voltage dividers in high-accuracy reference circuits
• Medical diagnostic equipment and patient monitoring devices
• Industrial instrumentation and process control transmitters
• Instrumentation amplifiers and precision gain networks
• Wheatstone bridge and strain gauge signal conditioning
• Test and measurement calibration equipment
• Energy metering and power quality monitoring
• Aerospace and defense electronics