Product Overview

Precision Metal Film Fixed Resistors from SHI MENG ELECTRONIC CO.,LTD. offer high accuracy, stability, and reliability with low noise and a small voltage coefficient. These resistors are designed for applications requiring precise resistance values and are compliant with RoHS and REACH environmental regulations.

Product Attributes

• Brand: SHI MENG ELECTRONIC CO.,LTD.
• Certifications: RoHS, REACH
• Material: Nickel-Chromium alloy conductive layer
• Coating: Epoxy resin (standard blue, special gray or brick red available)

Technical Specifications

Construction

Components:

• Tinned copper lead wire
• High heat exchanged ceramic base
• Tin-plated steel caps
• High stability Electric conduction film
• Color ring Mark
• Epoxy resin coating

Note: Standard coating is blue epoxy resin paint. Gray or brick red non-combustible paint can be specially provided. For 5W products, due to high power and surface temperature rise, non-combustible paint is recommended.

Glossary

• Rated resistance: Designed resistance value usually indicated on the resistor.
• Rated Ambient Temperature: Maximum ambient temperature at which the power rating may be applied continuously. Refers to the temperature around the resistor inside equipment.
• Rated power: Maximum power allowed at 70 ambient temperature durability test without exceeding specified resistance change.
• Derating curve: Used to determine rated power when Rated Ambient Temperature exceeds 70.
• Rated Voltage: Maximum D.C. or A.C. voltage (rms) that can be continuously applied, calculated from rated power and nominal resistance. Shall not exceed max. working voltage.
• Critical Resistance: Maximum nominal resistance value at which rated power can be applied without exceeding maximum working voltage.
• Maximum Working Voltage: Maximum D.C. or A.C. voltage (rms) that can be continuously applied to the terminations.
• Allowable voltage: Voltage applied for 5 seconds during short time overload test, typically 2.5 times rated voltage or max. overload voltage, whichever is lower.

Precautions for Use

• For high resistance values (hundreds of K ohms), the thin film layer can be susceptible to occasional failures, especially in high humidity environments. Consider alternative resistor types for high reliability designs with ultra-high resistance.
• For ultra-high resistance values, consider SHI MENG's MG High Voltage Surge Resistors or CHIP resistors.
• For low and ultra-low resistance values where temperature coefficient or current capability is critical, consider SHI MENG's KN Wire Wound Resistors.
• Precision metal film resistors have a thinner film layer compared to other thin film resistors of the same size and resistance, making them less resistant to pulses. Avoid high resistance products in high pulse or continuous pulse circuits.
• The conductive composition of precision metal film resistors can oxidize at high temperatures. Pay attention to surface temperature rise and surrounding cooling conditions for high-power products. Do not use adhesives for fixing or potting on the resistor surface, as they can impede heat dissipation and potentially cause electrochemical reactions leading to failure.