Series:	KO-CAP® T540
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance:	330µF
Tolerance:	±20%
Voltage - Rated:	4V
Type:	Molded
ESR (Equivalent Series Resistance):	40 mOhm @ 100kHz
Operating Temperature:	-55°C ~ 125°C
Lifetime @ Temp.:	2000 Hrs @ 125°C
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:	High Reliability

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Introduction to Tantalum - Polymer Capacitors

Tantalum polymer capacitors, sometimes referred to as polymerized tantalum electrolytic capacitors, are electrochemical units with a tantalum anode, a conductive polymer cathode, and an electrolyte between the two electrodes. They are widely used in a variety of consumer, industrial and automotive applications due to their exceptional stability, low ESR and small case size.

The T540D337M004DH87057280

The T540D337M004DH87057280 is a Tantalum – Polymer Capacitor, made by TDK Corporation. It has a 4 V rated voltage and is 8.7mm long, with an exterior diameter of 5.3mm. The capacitance of the device is 0.47 μF, and its temperature coefficient is ±30 ppm/°C. Its maximum capacitance change rate is ≤ ±30% at -55°C to 85°C, and it has very good electrical characteristics in its operating temperature range of -55°C to 125°C.

Application Fields

Tantalum polymer capacitors have a wide range of applications due to their excellent characteristics. They are used in any application that requires high capacitance values in a small device and are suitable for operation in extreme temperatures. They are commonly used as DC blocking capacitors in power supplies, as energy storage elements in batteries, and as decoupling capacitors in high frequency circuits. They are also used in high-speed processors, ASICs, and RAM chips.

Working Principle

Tantalum polymer capacitors work on the principle of electrochemical double-layer capacitance. In this type of capacitor, the two electrodes are separated by an electrolyte and are immersed into two liquid layers — one containing positively charged ions and the other layer containing negatively charged ions. When a voltage is applied to the electrodes, an electric field forms in the electrolyte layer, resulting in an attraction of the ions towards each other, increasing the capacitance of the device. As the voltage across the capacitor increases, the electric field will also increase, causing more ions to move between the two layers and increasing the capacitance further. When the voltage is removed, the field will collapse, causing the ions to move back into the separate layers and decreasing the capacitance.

Conclusion

The T540D337M004DH87057280 Tantalum-Polymer Capacitor is a device made by TDK Corporation with a rated voltage of 4V and a capacitance of 0.47 μF. It is suitable for applications operating in extreme temperatures, and has excellent electrical characteristics in its operating temperature range of -55°C to 125°C. It works on the principle of electrochemical double-layer capacitance, where an electric field is created to increase the capacitance of the device. Tantalum-Polymer capacitors have a wide range of applications due to their exceptional stability, low ESR and small case size.

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