T86D157K004EAAS

Series:	TANTAMOUNT®, T86
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance:	150µF
Tolerance:	±10%
Voltage - Rated:	4V
Type:	Molded
ESR (Equivalent Series Resistance):	600 mOhm
Operating Temperature:	-55°C ~ 125°C
Lifetime @ Temp.:	--
Mounting Type:	Surface Mount
Package / Case:	2917 (7343 Metric)
Size / Dimension:	0.287" L x 0.169" W (7.30mm x 4.30mm)
Height - Seated (Max):	0.122" (3.10mm)
Lead Spacing:	--
Manufacturer Size Code:	D
Ratings:	COTS
Features:	Fail Safe with Built-in Fuse
Failure Rate:	--

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Tantalum Capacitors

Tantalum capacitors are electrolytic capacitors providing highly stable capacitance. It uses the combination of tantalum metal powder and a dielectric oxide, usually tantalum pentoxide, to store an electrical charge within an insulated foil construction. This type of capacitor is particularly useful due to the fact that levels of capacitance remain relatively stable over time, even when operating in environments with high temperatures. The most common type of tantalum capacitor is the molded version, which is marked with the prefix T86D157K004EAAS.

Applications

Tantalum capacitors are widely used in a variety of electronic applications due to their high reliability, stability and low cost. They are commonly found in portable electronic devices such as cell phones, digital cameras, PDAs, laptops and stereos, and can also be found in medical equipment, automotive electronics, and test & measurement equipment. Additionally, tantalum capacitors feature prominently in memory applications such as random access memory (RAM) modules and non-volatile memory used in embedded systems.

Working Principle

Tantalum capacitors derive their properties from the ability of the tantalum body to form an electrochemical capacitor. The dielectric of a tantalum capacitor is a thin layer of tantalum pentoxide (Ta2O5) which acts as an insulator between the anode (typically made of metallic tantalum powder) and the cathode (the outer casing). During the manufacturing process, the tantalum oxide layer is formed when the anode is exposed to an oxygen rich environment, leading to an insulation layer between the metal body (or anode) and the outer casing (cathode). This insulation layer prevents current from flowing between the anode and cathode until a voltage is applied to the capacitor. When a voltage is applied to the tantalum capacitor, ions from the electrode material are drawn to the tantalum oxide layer, resulting in a charged polarization of electrons. When connected in an external circuit, these polarized electrons are able to move freely within the capacitor and contribute to the capacitance of the device. When current flows through the capacitor, electrons flow through the anode and an equivalent number of electrons are entrapped within the dielectric layer. This forms a large accumulation of charge within the dielectric, which contributes to the capacitance of the device. When current rises and falls, the charge stored within the dielectric is also able to oscillate and cause a negative capacitance balance, resulting in a decrease in the total capacitance of the device. Tantalum capacitors are also very stable and reliable components, as the dielectric layer formed during manufacturer provides excellent insulation and far less leakage than other types of capacitor. As such, it is often used for applications that require high performance over long periods of time.

Conclusion

Tantalum capacitors are widely used in a variety of electronic applications due to their high performance, stability and reliability. T86D157K004EAAS is the most common type of tantalum capacitor, and it uses the combination of tantalum metal powder and a dielectric oxide, usually tantalum pentoxide, to store an electrical charge within an insulated foil construction. When current flows through the capacitor, ions from the electrode material are charged, forming a large accumulation of charge within the dielectric, which contributes to the capacitance of the device. The highly stable performance of tantalum capacitors makes them highly suitable for applications that require long-term performance and reliability.

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