SMG Series Metal Glaze High Voltage Chip Resistors
Metal glaze resistive element on surface-mount chip body
Power ratings 1W, 2W, and 3W
Resistance range 47kΩ to 33MΩ
Maximum permissible DC voltage up to 5000V (SMG 3WL)
Maximum permissible RMS voltage up to 3500V (SMG 3WL)
Tolerance options ±1% and ±5%
TCR ±200 ppm/°C over −65°C to +200°C
Maximum surface temperature 275°C
Flameproof UL94V-0 moulded package
Anti-sulfuration construction
Insulation resistance 10,000 MΩ minimum
Dielectric withstanding voltage AC 1000V for 1 minute
What are the SMG Series Metal Glaze High Voltage Chip Resistors?
The SMG series is a range of surface-mount high voltage chip resistors using a metal glaze resistive element, designed to withstand operating voltages far in excess of conventional thick film SMD resistors. Three power-rated variants are offered — the SMG 1WL at 1W, the SMG 2WL at 2W, and the SMG 3WL at 3W — with maximum permissible DC voltages of 1600V, 3500V, and 5000V respectively. The metal glaze construction provides high stability against environmental stress, including resistance to sulfuration, elevated temperature, and humidity, making it suitable for industrial and outdoor-adjacent PCB applications where standard resistors would degrade or fail.
Resistance values span 47kΩ to 33MΩ, with tolerance options of ±1% and ±5%. The temperature coefficient of resistance is ±200 ppm/°C across the full operating range of −65°C to +200°C. The rated continuous working voltage (RCWV) for each part is determined by the lower of √(Rated Power × Resistance Value) or the maximum permissible voltage for that model, ensuring that voltage stress on the resistive element remains within safe limits across the resistance range. Power derating is required for ambient temperatures above 20°C in accordance with the published derating curve, with maximum element surface temperature not to exceed 275°C.
The SMG series is packaged in a flameproof UL94V-0 moulded body designed for automated surface-mount assembly, reducing placement and soldering costs compared with through-hole or axial alternatives. The construction incorporates anti-sulfuration protection, which prevents the resistive element from degrading when exposed to sulfur-bearing atmospheres common in industrial environments. Reliability characteristics include a load life drift of ≤±3% after 1000 hours at rated power and 70°C, and a moisture-proof load life drift of ≤±3% after 1000 hours at 40°C and 95% relative humidity, confirming suitability for long-term deployment in demanding operating conditions.
SMG Series Metal Glaze High Voltage Chip Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: SMG
Resistor type: High Voltage
Description: Metal glazed chip
Power Rating: 1W, 2W, 3W
Resistance (Ω): 47k~33M
Tolerance (%): ±1, ±5
TCR (ppm/C): 200
Applications of the SMG Series Metal Glaze High Voltage Chip Resistors
Where RARA high voltage resistors are deployed in the field.
High voltage power supply feedback and voltage division networks — stable high-resistance divider elements in HVDC, laser, and electrostatic power supplies operating at voltages to 5000V DC.
Telecommunications transmitter power supplies and antenna tuning units — high voltage signal conditioning where board-level SMD placement is required alongside elevated operating voltages.
Industrial control panels and automation equipment — input protection, bias, and voltage sensing resistors in systems subject to line-voltage transients and sulfur-bearing industrial atmospheres.
Test and measurement instrumentation — precision high-voltage probe dividers, attenuator networks, and calibration references requiring stable metal glaze performance over wide temperature excursions.
Medical imaging and diagnostic equipment — voltage divider and feedback resistors in X-ray generator and CT scanner high-voltage power supplies.
ESD and surge protection circuits — high-impedance current-limiting elements that provide voltage standoff substantially beyond standard SMD resistor ratings without increasing board footprint.
Radar and RF high-power transmitter supplies — stable high-resistance SMD components for voltage monitoring and conditioning in circuits where standard parts would be overstressed.
Renewable energy and power conditioning equipment — voltage sensing and bleeding resistors in solar inverter, wind converter, and energy storage systems requiring reliable performance at elevated bus voltages.
Related Products of the SMG Series Metal Glaze High Voltage Chip Resistors
Model: HVTK (HVR)
Resistor type: High Voltage
Description: Thick film chip
Power Rating: 1/16W~1W
Resistance (Ω): 10~100M
Tolerance (%): ±1, ±5
TCR (ppm/C): 100~4000
Model: UHV
Resistor type: High Voltage
Description: High Voltage and Ohm
Power Rating: 0.5W~3W
Supply voltage: 3kV~14kV
Resistance (Ω): 1K~2G
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 25~500
Model: MGR
Resistor type: High Voltage
Description: Metal glazed
Power Rating: 1/4W~3W
Resistance (Ω): 1k~1G
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100, 200
Model: HVE
Resistor type: High Voltage
Description: Thick film Tubular
Power Rating: 2.5W~20W
Supply voltage: 4.8kV~45kV
Resistance (Ω): 200~10G
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C): 100
Why Choose RARA High Voltage Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Widest Voltage Range
From 1kV SMD chip types to 90kV precision planar resistors — RARA's high voltage lineup covers more of the voltage spectrum than virtually any single supplier.
02
Extreme Precision
The 400 Series delivers ±0.05% tolerance and 5 ppm/°C TCR — precision that rivals dedicated metrology components, available at high voltage ratings up to 90kV.
03
5 Form Factors
SMD, axial, radial, tubular, and planar configurations give design engineers the right package for board-level, through-hole, or chassis-mounted high voltage circuits.
04
Global Track Record
Trusted by Toshiba, Siemens, Rockwell, and Schneider Electric — deployed in medical, industrial, and telecom high voltage systems across six continents.
