T491C685K035AT7280

Lifetime @ Temp.:	2000 Hrs @ 125°C
Failure Rate:	--
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	C
Lead Spacing:	--
Height - Seated (Max):	0.110" (2.80mm)
Size / Dimension:	0.236" L x 0.126" W (6.00mm x 3.20mm)
Package / Case:	2312 (6032 Metric)
Mounting Type:	Surface Mount
Series:	T491
Operating Temperature:	-55°C ~ 125°C
ESR (Equivalent Series Resistance):	1.8 Ohm
Type:	Molded
Voltage - Rated:	35V
Tolerance:	±10%
Capacitance:	6.8µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

T491C685K035AT7280 is a type of tantalum capacitor, it is a form of electrolytic capacitor with an anode made of tantalum, which has been oxidized to form a layer of tantalum pentoxide (Ta2O5). The tantalum pentoxide, also known as a dielectric, is insulated by an electrolyte and when voltage is applied, a layer of surplus electrons is created that acts as the capacitance. This results in a high capacitance and low equivalent series resistance (ESR), making it an ideal choice for anti-aliasing filters and other applications.

Application Fields

T491C685K035AT7280 tantalum capacitors are found in a variety of applications - from portable audio to industrial equipment - due to their superior properties. They are often used in filtering and power conditioning in industries such as mobile, embedded, military and aerospace. Their properties also make them suitable for RF, medical and automotive applications.They are particularly suitable for use in high energy density, high frequency and high ripple current applications, due to their very low ESR and low self-inductance characteristics. In power supplies, for example, the low ESR allows for low-noise operation, whilst the low self-inductance helps to minimize voltage transients, allowing for stable operation.In audio applications, the low ESR and high capacitance of the T491C685K035AT7280 capacitor allows for tremendous filtering capabilities with minimal loss of fidelity. This makes them ideal for use in high-end Hi-Fi components and studio equipment.

Working Principle

The T491C685K035AT7280 uses a tantalum electrolyte which behaves like a conductor when a voltage is applied. This creates a layer of surplus electrons on the anode called the space charge layer.The space charge layer and the dielectric of the capacitor then form a capacitor. This layer behaves as a dielectric and stores an electric field.The current flow is restricted and in equilibrium, settle on both sides of the dielectric layer. As the applied voltage is increased, the current flow increases and so does the stored electric field. The higher the applied voltage, the higher the capacitance of the device.

Conclusion

T491C685K035AT7280 is a type of tantalum capacitor with excellent properties such as low ESR and low self-inductance characteristics. It is an ideal choice for applications in high energy density, high frequency and high ripple current, as well as in industries such as mobile, embedded, military and aerospace. It is also popularly used for audio applications such as filtering and power conditioning, due to its high capacitance and low loss of fidelity.

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