KOA Speer...
A Leader in
Anti-Sulfuration
Chip Resistors
Silver-based inner electrodes in flat chip resistors can lose conductivity when the silver reacts with sulfur in a high-sulfur environment. The electrodes can lose all conductivity and disconnect the circuit as sulfuration continues. KOA Speer has developed a complete line of anti-sulfur chip resistors and arrays to protect against sulfuration of the resistor electrodes.
Features:
- Excellent anti-sulfuration characteristics due to use of high sulfuration-proof inner top electrode material
- Excellent heat resistance and environmental resistance by applying metal glaze thick film to resistive film
- AEC-Q200 Tested
- Passes ASTM-B809 anti-sulfuration testing
Anti-Sulfur Performance Comparison
Why Choose Anti-Sulfur?
Sulfuration is a phenomenon that occurs in resistors with silver-based inner electrodes. When a resistor is used in a high-sulfur atmosphere, the sulfur molecules can migrate between the protective film and the outer electrode to the inner electrode, where they react to form silver sulfide. Silver sulfide is an insulator, and the resistance of the device increases toward an open circuit. KOA's product line includes resistors with sulfuration-resistant inner electrodes.
Chip Resistor Disconnected by Sulfuration
Needle crystals of
silver sulfide (Ag2S)
KOA Speer's Family of
Anti-Sulfur Chip
Resistors
General Purpose
RK73B-RT
- ±2%, ±5% General Purpose Flat Chip Resistor
RK73H-RT
- ±0.5%, ±1% High Precision Flat Chip Resistor
RK73Z-RT
- Zero ohm with max. resistance of 50mΩ
High Precision
RS73-RT NEW
- High reliability with ΔR of ±0.2%, ±0.4% in reliability test
RK73G-RT
- ±0.5%, ±1% Ultra Precision Flat Chip Resistor
Wide Terminal
WK73R-RT
- Power rating: 0.75W (0508, 0612), 1W (0508, 0612, 1020, 1218), 1.5W (1225), 2W (1225)
WK73S-RT
- Power rating: 0.75W (0508, 0612), 1W (0508, 0612, 1020, 1218), 1.5W (1225), 2W (1225)
WK73R-RT (Higher Power) NEW
- Higher power rating: 1.5W (0612), 2W (1020), 3W (1225)
WK73S-RT (Higher Power) NEW
- Higher power rating: 1.5W (0612), 2W (1020), 3W (1225)
High Voltage
HV73V-RT
- High Voltage Flat Chip Resistor for Automotive
HV73-RT**
- High Voltage Flat Chip Resistor
Anti-Surge
SG73-RT
- Superior to RK73 series in surge withstanding voltage and pulse withstanding voltage
SG73P-RT
NEW- Able to select resistance from +0.5%
SG73S-RT
NEW- Surge Precision, Low Resistance (0.1Ω)
Current Sense
SR73-RT
- Low Resistance (0.1Ω)
High Temperature
HSG73P-RT
- High Temperature Flat Chip Resistors
** HV73-RT is not AEC-Q200 Tested; see HV73V-RT for AEC-200 Tested version