Your basket is empty

MLCC Replacement Options | Tantalum Chip Substitution

The MLCC capacitor market is currently going through a tough supply period.

MLCC manufacturers are not able to service all of their high volume, consumer and Automotive segments. This is resulting in considerable MLCC shortages that may take several years to be resolved.

This may limit end electronic users production and is causing serious market concerns with risks of line stop situations. Over the decades MLCCs Class II capacitors were replacing tantalum capacitors, mostly due to the price and availability reasons. It may be good to refresh some of the basic replacement guidelines from the opposite direction – replacing MLCC class II by tantalum and NbO capacitors – based on the current situation in the market , to be ready and flexible. 

MLCC current leadtimes on certain types may reach as long as 40 to 60 weeks!, and it remains tight in May, tantalum capacitors are getting tighter as well, nevertheless at the time of writing of this article they can still offer half  the leadtime on a number of possible replacement parts. This also includes NbO capacitors, (sister parts to tantalum capacitors), with many similar features and despite this, they occupy a relatively small percentage of  the market, they should be included in the list of considered alternatives to provide wider flexibility and options.

Case Sizes and Pad Dimensions

MLCC and tantalum/NbO footprints and pad designs are compatible for at least the basic case sizes 0603, 0805, 1206 and 1210 thus,  board PCB pad re-design is not normally necessary . Nevertheless, some attention has to be paid to the component thickness (max height) for head to head replacement. The table in the gallery shows some cross comparison of case sizes between MLCC and tantalum/NbO capacitors. Please note that the tantalum letter code may be manufacturer and series specific, especially in its low profile version.

From the technology stand point, MLCCs are good in making parts physically smaller, tantalums answer better, the needs for thin and flat designs. For example, if the task is to get maximum capacitance within 1.0mm max height, tantalum capacitors can make a larger thinner part with high capacitance in a mechanically strong body, unlike the MLCCs that could lead to a fragile design with risk of cracking. In reality, tantalum capacitors are available in more thickness and low profile case options as seen in Table 1. On the other hand, MLCC technology can go to much smaller dimensions and make smaller capacitors available. (not listed in the Table 1. as not relevant for this comparison).

Volumetric efficiency wise, X7R/X5R MLCCs offer a similar volumetric efficiency today as available with tantalum capacitors or one step higher values at smaller case sizes. Nevertheless MLCC “effective capacitance” in the real operation conditions should be considered as the capacitance value decreases with DC and AC applied voltage compared to tantalum/NbO with stable rated capacitance value.

Cost Matters

In a “stable” market environment, technology based cost for 1206 case MLCC class II and Tantalum capacitors can be very close (depending on capacitance and voltage value). The 1206 case size is a cost down sweet-spot case size for a standard tantalum capacitors and it can be in price competitively positioned as MLCC class II.

MLCC capacitors are manufactured in process sheets that are cut into individual capacitors, its cost down mechasnism (with certain limits and specific product exceptions) is downsizing. Thus, smaller case sizes 0805 and 0603 may be cheaper than 1206, even with a more expensive high tech material used. (as there are more smaller units per one process sheet produced).  This is not the case for tantalum/NbO capacitors, where a standard “in-row units” manufacturing technology processing of smaller case sizes below 1206 size is more expensive.

In consequence, 0805 and 0603 tantalum capacitors may be more expensive compared to the MLCC components. However, to be fair to tantalums, it is not that easy and simple a  rule, as tantalums are more stable without loss of capacitance with applied voltage, thus in some cases it may end up that the stable performance tantalum cap is a cheaper solution than a MLCC solution that loses capacitance with voltage and time … let’s discuss this more in next chapters……..

0402 and 0201 tantalum case sizes are also available on the market, but are considered as a niche applications with parameters, cost and mass volume capability too far from the MLCC high volume parts to be considered in this article. On the large case size scale, MLCC parts bigger than 1210 are also available, nevertheless the volume is much smaller.

The above discussed cost structure is however only reflective of  capacitor pricing in “stable” market conditions. Today, when we are in a short supply situation, the main price driver is becoming “availability”. As a consequence, in example, MLCC prices are expected to rise 40-50% in 2Q18 according to Taiwan based Digitimes.

Key Advantages Overview
  • MLCC Class II Advantages
    • Low ESR
    • High ripple load
    • Non-polarized
    • Low DCL
  • Tantalum/NbO Advantages
    • No piezo noise
    • stable capacitance with voltage BIAS and temperature
    • high mechanical strength, robustness and vibration resistance
  • Common Strong Points
    • Lead-free standard design and reflow compatibility
    • ROHS friendly standard design
    • Wide temperature range (-55/+125C ready as a standard)
    • Relatively very good basic reliability
    • High capacitance in small dimensions
Conclusion - Suitable Replacement Applications

Based on the above discussion and performance comparison one can assume the suitable applications for tantalum to MLCC replacement:

A. LOW RISK:

– all applications, where very low ESR and high ripple current load are not a prime requirement, such as circuit functions – coupling/decoupling including audio circuits, selected filtering, timing etc.

Checklist:

  • a) low ESR requirements and high ripple current load  Yes/No/Level
  • b) DCL leakage level in case of battery operated circuit

Tantalum or NbO capacitors in these applications can represent an even more stable, reliable solution, possibly superior compared with the original MLCC capacitor.

B. MORE DETAILED EVALUATION NEEDED:

– smoothing applications typically at DC/DC converters with high power load requirements.

Checklist:

  • a) smoothing frequency required at low frequencies ESR of MLCC capacitors may be even higher than tantalum. Use of tantalum capacitors is thus possible with potentially improved performance.
  • b) beware of the required low ESR and ripple load specification values as the critical characteristics as the low ESR may be the main limiting factor for the circuit operation.
  • c) return to b) and check the low ESR / ripple load requirements in the entire end device operating temperature range
  • d) consider appropriate derating rules for tantalum, NbO and polymer capacitors.
MLCC Replacement Guide

Many years ago, IPC set a standard of recommended footprints for the most classes of surface mount electronic components, including resistors, capacitors and inductors.

Although many companies develop their own internal footprint guidelines, IPC standards for MLCC and tantalum chip are the starting point. At the time they were developed, there was only one common footprint between MLCC & Ta chip - the 1206 size, which is common to both series.

Since that time tantalum chip has added smaller case sizes, designed for compatibility with IPC MLCC footprints. This guide shows, by case size, which tantalum chip series and case sizes fit a common IPC footprint.

As tantalum capacitance / voltage ratings overlap with most Class II ratings (X7R, X5R, X7S etc.), when looking for a substitute first use this guide to establish a footprint compatible tantalum chip series then contact DMTL to establish compatible electrical ratings.

Information source EPCI / AVX Corporation

MLCC Case-V-Cap

MLCC Case

MLCC V

MLCC Cap uF

MnO2 

MnO2 

MnO2

Polymer

OxiCap

1210 6 476 1210 6 47 TAJB476M006RNJ TAJB476M010RNJ F930J476MBA TCJB476M006R0070 NOJB476M006R
1210 6 475 1210 6 4.7   TAJB475M016RNJ F931D475MBA    
1210 6 226 1210 6 22   TAJB226M010RNJ F931A226MBA TCJB226M010R0300 NOJB226M006R
1210 6 107 1210 6 100 TAJB107M006RNJ TAJB107M010RNJ F930J107MBA TCJB107M006R0070 NOJB107M006R
1210 6 106 1210 6 10   TAJB106M016RNJ F931C106MBA   NOJB106M010R
1210 6 105 1210 6 1   TAJB105M035RNJ      
1210 4 476 1210 4 47   TAJB476M010RNJ F920G476MBA TCJB476M006R0070 NOJB476M004R
1210 4 475 1210 4 4.7   TAJB475M016RNJ F931D475MBA    
1210 4 226 1210 4 22   TAJB226M010RNJ F931A226MBA TCJB226M010R0300 NOJB226M004R
1210 4 107 1210 4 100 TAJB107M004RNJ TAJB107M010RNJ F930G107MBA TCJB107M004R0070 NOJB107M004R
1206 6 476 1206 6 47 TAJA476M006RNJ   F930J476MAA TCJA476M006R0100  
1206 6 475 1206 6 4.7   TAJR475M010RNJ F931A475MAA   NOJA475M006R
1206 6 226 1206 6 22 TAJA226M006RNJ TAJA226M010RNJ F930J226MAA TCJA226M006R0300 NOJA226M006R
1206 6 225 1206 6 2.2   TAJA225M016RNJ F931C225MAA    
1206 6 107 1206 6 100     F930J107MAA TCJA107M006R0100  
1206 6 106 1206 6 10 TAJA106M006RNJ   F930J106MAA TCJA106M006R0300 NOJA106M006R
1206 4 476 1206 4 47 TAJA476M004RNJ TAJA476M006RNJ F930G476MAA TCJA476M004R0200 NOJA476M006R
1206 4 226 1206 4 22 TAJA226M004RNJ TAJA226M006RNJ F930G226MAA TCJ226M004R0300 NOJA226M004R
1206 4 107 1206 4 100 TAJA107M004RNJ TAJA107M006RNJ F930G107MAA TCJA106M004R0200  
1206 4 106 1206 4 10   TAJA106M006RNJ F930J106MAA TCJA106M006R0300 NOJA106M006R
0805 6 475 0805 6 4.7 TAJR475M006RNJ TAJR475M010RNJ F920J475MPA   NOJP475M006R
0805 6 226 0805 6 22 TAJP226M006RNJ   F981A226MSA F380J226MSA  
0805 6 225 0805 6 2.2 TAJR225M006RNJ TAJR225M010RNJ F920J225MPA    
0805 6 106 0805 6 10 TAJR106M006RNJ TAJR106M010RNJ F920J106MPA   NOJP106R006R
0805 4 475 0805 4 4.7 TAJR475M004RNJ TAJR475M006RNJ F920G475MPA   NOJP475M006R
0805 4 226 0805 4 22 TAJR226M004RNJ TAJR226M006RNJ F920G226MPA F380J226MSA  
0805 4 225 0805 4 2.2 TAJR225M004RNJ TAJR225M006RNJ F920J225MPA   NOJP225M010R
0805 4 106 0805 4 10 TAJR106M004RNJ TAJR106M006RNJ F920G106MPA   NOJP106M004R
0603 6 476 0603 6 47 TLCL476M006R   F980J476MMA F380J476MMAAXE  
0603 6 475 0603 6 4.7 TLCL475M006R TLCL475M010R F980J475MMA F381A475MMA  
0603 6 226 0603 6 22 TLCL226M006R   F980J226MMA F380J226MMA  
0603 6 225 0603 6 2.2 TACL225M006R TACL225M010R F981A225MMA F381A225MMA  
0603 6 106 0603 6 10 TACL106M006R TACL106M010R F980J106MMA F380J106MMA  
0603 6 105 0603 6 1 TACL105M006R TACL105M010R F981C105MMA    
0603 4 476 0603 4 47 TLCL476M004R TLCL476M006R F980G476MMA F380J476MMAAXE  
0603 4 475 0603 4 4.7 TACL475M004R TACL475M006R F980J475MMA F381A475MMA  
0603 4 226 0603 4 22 TACL226M004R TACL226M006R F980G226MMA F380J226MMA  
0603 4 225 0603 4 2.2 TACL225M004R TACL225M006R F981A225MMA F381A225MMA  
0603 4 106 0603 4 10 TACJ106M004R TLCJ106M006R F980J106MMA F380J106MMA  
0402 6 475 0402 6 4.7 TLCK4756M006R   F980J475MUA F380J475MUA  
0402 6 474 0402 6 0.47 TACK474M010RTA   F981C474MUA    
0402 6 225 0402 6 2.2 TACK225M006RTA TLCK225M010RTA F981A225MUA    
0402 6 106 0402 6 10 TLCK106M006   F980J106MUALZT    
0402 6 105 0402 6 1 TACK105M006RTA     F380J105MUA  
0402 6 104 0402 6 0.1 TACK104M016RTA        
0402 4 475 0402 4 4.7 TLCK475M004RTA TLCK475M006RTA F980G475MUA F380J475MUA  
0402 4 474 0402 4 0.47 TACK474M010RTA   F981C474MUA    
0402 4 225 0402 4 2.2 TACK225M006RTA   F981A225MUA    
0402 4 105 0402 4 1 TACK105M006RTA     F380J105MUA