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PPS, PEN and Acrylic SMD Film Capacitors, Are they as Good as MLCCs ?

30.6.2021
Reading Time: 6 mins read
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The most common large size film capacitors are based on PP and PET dielectrics, but is there any advantage to consider PPS, PEN or acrylic film capacitors for a small chip size and can they compete with MLCC capacitors? For anyone seeking a capacitor coming in a small case size, with a low-to-high voltage range, high precision and stable capacitance it may worth to look at SMD chip type miniature film capacitors and its advantages in number of applications.

The case of chip type film capacitors and some of their basic features, look pretty much like MLCCs. So, what’s the difference between the two technologies? What are the advantages chip type film capacitors have?

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Let’s make a quick comparison to find the answer.

Figure 1.: Comparison between Chip Type Film Capacitor and MLCC; source: Panasonic

compared with MLCCs, chip type film capacitors have following advantages in terms of electric characteristics:

  • High preciseness: a tight capacitance range down to ±2%
  • Wide voltage range up to 630VDC
  • Low dielectric absorption down to 0.05%
  • Better DC bias characteristics
  • No piezoelectric effect
  • Self-healing ability

PPS SMD Film Capacitors

These capacitors are made using stacked metallized PPS film as a dielectric with simple mold-less construction. The construction may be slightly different for a lower voltage range such as 16VDC-50VDC (See Fig. 2.) and higher voltage chips around 100VDC (see Fig.3.).

Features

  • excellent electric characteristics
  • low ESR, low DF
  • stable capacitance against temperature and DC bias
  • down to 1.6mm x0.8mm footprint
  • tight capacitance tolerance of ±2% & ±5%
  • capacitance up to 220nF
  • 16VDC to 100VDC voltage ratings
Figure 2. Low Voltage PPS SMD Film Capacitors Construction; source: Panasonic
Figure 3. High Voltage PPS SMD Film Capacitors Construction; source: Panasonic
Figure 4. PPS SMD Chip Film Capacitors (blue line) vs MLCC chip capacitors (purple line) electrical characteristics; source: Panasonic

Applications

The excellent electrical parameters stability makes PPS film chip capacitors as the most suitable solution for filtering in xDSL circuit of class D amplifiers for speakers, smartphones and wireless communication etc., as well as for LED circuits.

Figure 5. PPS film chip capacitors typical application example in xDSL and LED circuits; Source: Panasonic

The key benefit of PPS film capacitors in these applications is a very fast lock-up time and it doesn’t show a piezoelectric effect as MLCCs do, which makes it a perfect solution for PLL (phase locked loop) circuit in applications such as smart phones, wireless communication and Bluetooth® devices etc. See figure 6.

Figure 6: Lock-up time and filtering comparison of PPS film capacitors (ECHUX) vs MLCC and Tantalum capacitors in PLL circuits; source: Panasonic

Acrylic Plastic SMD Film Capacitors

These type of film capacitors utilize stacked metallized acrylic plastic film as dielectric and inner electrode with simple mold-less construction.

Features

  • wide capacitance range up to 1.0μF
  • small case size (3.2mm x2.5mm footprint for 1.0μF)
  • excellent electric characteristics
  • low ESR, low DF
  • stable capacitance over temperature
  • outstanding performance for noise reduction in measurement circuits
  • ultra-low distortion characteristics ideal for coupling in audio circuits
Figure 7. SMD acrylic plastic film capacitor construction; source: Panasonic
Figure 8. Acrylic plastic SMD Chip Film Capacitors (blue line) vs tantalum (red) and MLCC chip capacitors (purple line) electrical characteristics; source: Panasonic
Figure 9. Acrylic plastic SMD Chip Film Capacitors typical application and distortion comparison to tantalum (red) and MLCC (purple) capacitors; source: Panasonic

PEN SMD Film Capacitors

This type of capacitors is based on stacked metallized PEN film as dielectric with simple mold-less construction.

Figure 10. SMD PEN film capacitor construction; source: Panasonic

Features

  • small case size
  • wide voltage range up to 630VDC
  • stable capacitance and ESR characteristics against bias and temperature
  • ideal for DC blocking in xDSL circuit, as well as integration for EL lamp driver

PPS vs Acrylic vs PEN SMD Film Capacitors Comparison

Let’s summarize what kind of typical applications will benefit from the small high precision, high performance chip type PPS, Acrylic and PEN film capacitors offer.

Figure 11. PPS vs PEN vs Acrylic SMD chip film capacitors application selection guide; source: Panasonic

Related

Source: Panasonic Industry

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