Low-Loss Battery Circuit with Tantalum Capacitor: Selection and Soldering Considerations

What is Low-Loss Battery Circuits: A low-loss battery circuit is specifically designed to minimize energy loss and power consumption from the battery to the circuit load. Such circuits are crucial for devices that rely on battery power for extended periods, including portable electronics, sensor nodes, medical devices, and IoT equipment.

 

Key Considerations for Tantalum Capacitor Selection:

Rated Voltage:

Ensure the rated voltage of the tantalum capacitor exceeds the maximum operating voltage of the circuit to ensure stable operation and prevent capacitor damage.

Capacitance Value:

Select an appropriate capacitance value based on the circuit requirements. Too small a capacitance may degrade circuit performance, while too large may increase circuit size and cost.

Equivalent Series Resistance (ESR):

Opt for tantalum capacitors with low ESR to reduce circuit losses and enhance efficiency, especially in high-frequency applications.

Leakage Current:

The selection of low-loss battery circuits places extremely high demands on leakage current requirements. Ordinary levels do not suffice and necessitate special screening for low leakage currents to ensure minimal circuit power consumption, especially for long-life and low-power applications

Temperature Coefficient and Stability:

Choose tantalum capacitors with stable temperature coefficients to maintain consistent capacitance values across varying temperature conditions.

Long-Term Stability:

Consider the long-term stability of tantalum capacitors, especially under extreme temperature conditions, to ensure reliable circuit operation over extended periods.

 

Soldering Considerations:

Temperature and Time:

Use appropriate soldering temperatures and durations to prevent thermal damage to tantalum capacitors. Peak temperature settings should not exceed 250°C for more than 10 seconds to avoid overheating and subsequent performance degradation.

Recommended Soldering Methods:

Recommend infrared or hot air reflow soldering techniques to ensure uniform temperature distribution and minimize thermal stress on the capacitors.

Environmental Control:

Maintain a dry and clean soldering environment to avoid soldering quality issues caused by moisture or dust contamination.

Cooling and Handling After Soldering:​​​​​​​

Allow tantalum capacitors to cool gradually under natural conditions after soldering to mitigate temperature-induced stresses and ensure component integrity.

Quality Control and Inspection:​​​​​​​

Implement rigorous quality control procedures, including visual inspection and electrical performance testing before and after soldering, to verify compliance with specifications.

 

Below is a typical soldering diagram for a remote control. The peak temperature and time settings in the peak temperature zone need adjustment. Additionally, take note to avoid localized overheating of individual tantalum capacitors during surface-mount soldering. Ensure the peak temperature setting is ≤250°C, with a peak temperature duration of ≤10 seconds. Refer to Table 1 for reflow soldering wire and process parameters; optimal temperature differentials between zones should be ≤80°C. Excessive temperature during reflow soldering may lead to increased internal power consumption of tantalum capacitors. Consider the polarity attributes of tantalum capacitors, which are passive components. During production, avoid using a multimeter to measure any parameters.

By following the above selection and soldering considerations, you can effectively choose and apply tantalum capacitors in low-loss battery circuits, ensuring circuit stability, efficiency, and long-term reliability.

 

UF capacitors produce both SMD and radial capacitors, for SMD tantalum capacitgors, we have standard, low ESR and Polymer Tantalum Capacitors to replace Kemet, AVX etc tier-one brands, following cross reference chart FYI. We have engineer here to to do cross reference for you, kindly contact connie@ufcapacitors if any RFQ & inquiry.

 

	Description	UF Capacitors Equivalent Series Code	Kemet	AVX
	Polymer Tantalum Capacitors	CA55 Series CA55T107M0006000BR070 CA55T106M0035000CR200 .......	T520B107M006ATE070 T520A107M006ATE045 T521X337M016ATE025 T521X227M016ATE035	TCJC106M035R0200 TCJD226M035R0100 TCJA106M020R0150
	Tantalum Chip Capacitors, General Purpose, A,B,C,D,E Case	CA45 Series CA45T155K0050000CR CA45T226K0016000BR	T489C155K050ATE2K5 T491C106M016AT4100 T490B157MO06ATE500	TAJB226K016RNJ TLJA476M010R0600
	Low ESR Chip Tantalum Capacitors, A,B,C,D,E Case	CA45U Series CA45UT475K0016000CR201 CA45UT106M0035000DR120	T494T475K016AT T494T106K006AH T495X227KO10AHE045 T495D106M035ATE120	TPSA106K010R0900 TPSA475K010R1400 F931V226MNC
	Radial Epoxy Dipped Tantalum Capacitor	CA42 Series CA42T105K00350025B000 CA42T226K00350050B000	T350B474M050AS7301 T350C106M010AT7303	TAP226K035CCS