1206 package chip capacitor working voltage 2000V

easthewj

1206 package chip capacitor working voltage 2000V [Copy link]

I'd like to ask you guys, I see that some 1206 package chip capacitors can have an operating voltage of 2000V, but the distance between the two pads of the capacitor is only 1.5mm, is there a problem with safety regulations and insulation?

maychang

1.5mm on the circuit board or capacitor package surface is obviously not enough for 2kV, unless the capacitor and the wires are encapsulated in a solid or liquid insulating material.

maychang

For example, the TLP421 optocoupler has a voltage resistance of 5kV between its pins in air and 10kV in oil.

easthewj

maychang posted on 2020-12-15 17:03 For example, the voltage between the pins of the TLP421 optocoupler is 5kV in air and can reach 10kV in oil.

The withstand voltage of the optocoupler can reach 5KV because of its large creepage distance and electrical clearance.

easthewj

maychang posted on 2020-12-15 17:03 For example, the voltage between the pins of the TLP421 optocoupler is 5kV in air and can reach 10kV in oil.

I don't know how its rated voltage is 2000V. The distance between the two pins is only 1.8mm.

maychang

easthewj posted on 2020-12-15 17:25 I don't know how its rated voltage of 2000V comes from. The distance between the two pins is only 1.8mm

"I don't know how its rated voltage is 2000V. The distance between the two pins is only 1.8mm."

The best insulation (voltage resistance, or more accurately, electrical strength) is inside an insulating solid or liquid, followed by gas, and then the surface of a solid, because the surface of a solid may absorb water vapor or have dust.

If the surface of the capacitor is very clean, a distance of 1.8mm can withstand a voltage of 2kV. However, this is absolutely not allowed during use, because it is inevitable that moisture or dust will accumulate during use.

qwqwqw2088

The high voltage ceramic capacitor in 1206 package has a withstand voltage of 2000V, which should be the mark

easthewj

maychang posted on 2020-12-15 17:51 "I don't know how its rated voltage of 2000V comes from. The distance between the two pins is only 1.8mm." Insulation (withstand voltage, to be precise...

However, the pad of the 1206 package on the PCB is only about 1.5mm. Is there any problem with this application?

maychang

easthewj posted on 2020-12-16 10:47 But the pad of the 1206 package on the PCB is only about 1.5mm. Is there any problem with this application?

"But the pads on the 1206 package on the PCB are only about 1.5mm. Is there any problem with this application?"

This is of course a problem, the surface creepage distance is not enough.

However, if the circuit board and the capacitor are kept clean before and after welding, the capacitor is sealed with silicone rubber or silicone grease after welding (no bubbles inside), and the wire distance on the circuit board surface meets safety regulations, it can be used.

chunyang

This withstand voltage has little practical significance. If you must use it this way, the PCB substrate must be selected correctly first, and the entire PCB must be painted with appropriate insulating paint immediately after welding. The resulting cost increase is not as good as using a package that meets the creepage distance requirements.