SMD, axial leaded resistors for various electronics applications

by Vianie Li & Cecile de Veyra

Resistors are one of the three basic passive components in electronic circuits. Over the years, they have transformed from leaded to chip configurations, spurred by the miniaturization trend. While the surface-mount type is ubiquitous nowadays, the traditional through-hole design remains widely available for applications that are subject to environmental stresses such as vibration and heat.

In China, passive component manufacturers cater to this range of requirements by offering film, wirewound and cement resistors, potentiometers, varistors and resistor arrays. The first two types currently make up the bulk of shipments, according to suppliers interviewed by Global Sources Electronic Components.

Metal film resistors lead the selection for home appliances, communication devices and instruments. These have 1ohm to 10Mohm resistance range, 0.25, 0.5, 1 and 5 percent tolerances and -55 to 155 C operating temperature. For products with high-power circuits, there are wirewound kinds that can withstand up to 170 C environments.

In the SMD category, resistors in 0201, 0402, 0603, 0805, 1206, 1210, 1812, 2010 and 2512 packages are the most sourced by domestic and overseas buyers, according to companies interviewed.

For key manufacturing inputs such as resistive bodies, ceramic substrates, electrodes and outer coating materials, Chinese suppliers usually turn to domestic providers, sourcing from foreign companies only when required.

Material and components costs rose slightly in 2021, resulting in higher resistor prices. In the coming months, there is a possibility these will stabilize.

1W rated power, 2Mohm resistance

Rated at 1W, this SMWY1 X1-6954520 resistor from Dongguan Aillen Electronic Technology Co. Ltd has 2Mohm resistance, ±1 percent resistance tolerance and UL94V-0 rating.

The minimum order quantity is 1,000 units. Delivery takes 15 days.

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3.9ohm to 10Mohm resistance range

Suitable for use in power supplies, adapters, radios, TVs and computers, this RT Resistor-11 from Dongguan Aillen Electronic Technology Co. Ltd has 3.9ohm to 10Mohm resistance range, ±2, ±5 or ±10 percent resistance tolerance and 200, 250, 350, 500 or 750V maximum operating voltage.

The 1,000-unit minimum order has a 15-day lead time.

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0.25W rated power

This RoHS-compliant Carbon Film Fixed Resistor 0.25W from Elecsound Technology Co. Ltd
has 0.25W rated power and -55 to 125 C operating temperature.

An order of at least 1,000 units is delivered within seven days.

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5W rated power

Elecsound Technology Co. Ltd markets this CarbonFilmFixedResistor5W with 5W rated power and -55 to 125 C operating temperature. It complies with RoHS requirements.

The supplier requires a 1,000-unit minimum order. Lead time is seven days.

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1ohm to 22Mohm resistance range

Available in 0201, 0402, 0603, 0805, 1206, 1210 and 1812 sizes, Shenzhen Topmay Electronic Co. Ltd’s TMCR01 resistor has 1ohm to 22Mohm resistance range, 0.5, 1, 1.5, 1.9, 2, 2.2 or 3A rated jumper current and less than 20mohm±1 percent and less than 50mohm±5 percent jumper resistance values. It has 25, 50, 150 or 200V maximum operating voltage and 50, 100, 300 or 400V maximum overload voltage. The rated power is 1/20, 1/16, 1/10, 1/8, 1/4, 1/2, 3/4 or 1W and the dielectric withstand voltage 100, 300 or 500V.

The minimum order quantity required is 20,000 units. Delivery takes 14 days.

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1/4 to 5W rated power

Shenzhen Topmay Electronic Co. Ltd offers this TMRO metal-oxide film resistor with 1ohm to 22Mohm resistance range, ±1, ±2 or ±5 percent tolerance and -55 to 155 C operating temperature. It comes in variants with 1/4, 1/2, 1, 2, 3 or 5W rated power, 200, 250, 350 or 500V maximum operating voltage and 250, 350 or 500V maximum overload voltage.

The minimum order quantity is 20,000 units. Lead time is 14 days.

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