polyester film capacitor is also known as MKT or CL series capacitor, the most widely used models are CL11 and CL21. They adopt non-inductive winding of metallized PET film, epoxy resin encapsulation, radial lead out, and are favored by purchasers for small size and low cost.

CL21 capacitor package specification: The mainstream package is radial through-hole type, with common pin pitches of 5mm, 7.5mm, 10mm, 15mm and 20mm. The tolerance grades are J (±5%) and K (±10%). The capacitance range is 0.001μF to 10μF, and the rated DC voltage covers 50V to 1250V.

polyester film capacitor purchasing guide: When purchasing, confirm the actual working frequency first. It is not suitable for high-frequency pulse circuits. Check the body size limit of PCB, and confirm whether the lead length and printing content need to be customized. Before mass purchase, arrange samples for temperature cycle and load aging test.

weidy CL21 capacitor reminds that polyester film capacitors have high dissipation factor. If the circuit is high-frequency and high-ripple, it is better to switch to CBB polypropylene film capacitor to avoid excessive temperature rise and accelerated aging.