Part Number: T491X107K025AT

Manufacturer: KEMET

Description: CAP TANT 100UF 10% 25V 2917

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of T491X107K025AT

Datasheet  T491X107K025AT datasheet
Product Photos T491 Series 7.3L,4.3W
Product Training Modules Capacitor Basics- Typical Uses for Capacitors
EDA / CAD Models Download from Accelerated Designs
Standard Package 1
Category Capacitors
Family Tantalum Capacitors
Series T491
Packaging Digi-Reel?
Capacitance 100μF
Tolerance ±10%
Voltage – Rated 25V
ESR (Equivalent Series Resistance) 300 mOhm
Type Molded
Operating Temperature -55°C ~ 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) 0.169″ (4.30mm)
Lead Spacing
Manufacturer Size Code X
Features General Purpose
Lifetime @ Temp. 2000 Hrs @ 85°C
Online Catalog T491 Series
Other Names 399-8410-6


The most popular choice for surface mount designs right now is the KEMET T491. It was made especially for today’s highly automated surface mount techniques and equipment. The T491 combines KEMET’s tried-and-true solid tantalum technology, known and respected worldwide, with the latest materials, processes, and automation improvements. This gives the T491 unbeatable performance and value. This product meets or goes above and beyond what the EIA standard 535BAAC calls for.

Under J STD 020, the T491 has been given a moisture sensitivity level (MSL) of 1, and at temperatures below 30 degrees Celsius and humidity levels above 85%, it will last forever on the floor. The T491 standard terminations, which come in 100% matte tin and can be bought in this material, have good wetting qualities and work well with modern surface mount soldering systems. Tin/lead (Sn/Pb) terminations can be made for any part number if you ask them specifically.

You could also use gold-plated terminations and attach them with conductive epoxy. To meet EIA 481, these devices are usually packed in a tape and reel combination. This method works with all tape-fed placement units and makes integration very easy.

T491X107K025AT Benefits

  • Meets or goes above or beyond EIA Standard 535BAAC.
  • Tape & Reel standard packaging per EIA 481.
  • Symmetrical and correct endings.
  • Gold-plated ends are an option.
  • Case with a laser mark.
  • On sizes C, D, E, U, V, and X, the surge current is 100%.
  • Halogen-free epoxy.
  • Capacitance 0.1 – 1,000 µF.
  • Tolerance from 10% to 20%.
  • Voltage 2.5 – 50 VDC.
  • Extended range values.
  • Case sizes with a low profile.
  • RoHS-compliant and free of lead at the ends.
  • Temperatures between 55°C and +125°C can be used.

T491X107K025AT Applications

Decoupling and filtering are two common applications that can be found in a wide range of end applications. DC/DC converters, portable electronics, telecommunications, and control units are all examples of these kinds of uses.

Environmental Compliance

RoHS compliant (6/6) in accordance with Directive 2002/95/EC when ordered with 100% tin solder, gold plating, or non-magnetic properties.

100% Sn solder.

Epoxy without halogens passes the requirements of UL 94 V-0 and ASTM E 595 for the outgassing test.

Soldering Process

The KEMET family of surface mount capacitors can be reflow soldered using wave (either single or dual), convection, infrared, or vapor phase processes. It is advised that these components be preheated to minimize severe temperature stress. The profile conditions KEMET recommends for convection and infrared reflow are the same as those the IPC/J-STD-020D standard says should be used to test moisture sensitivity.

Under these conditions, the devices can safely tolerate a maximum of three reflow passes. Please note that the X/7343–43 case size may resist wave soldering; however, the tall profile (4.3 mm maximum) mandates that attention be taken to create wave soldering processes. Due to the difficulty in maintaining process control while soldering by hand, extreme caution is required. If this step is taken, you must take precautions to prevent the soldering iron from contacting the molded case. The solder pad needs to be heated with the iron, and then the solder must be applied between the pad and the termination until reflow occurs.

Once reflow has taken place, the iron must be removed as soon as possible. It is not suggested to heat the top surface of a chip or ” wipe ” its edges. During regular reflow operations, one may see that the epoxy’s original golden hue has taken on a slightly darker appearance. This small darkening is typical and in no way compromises the quality of the product. This modification will not have any impact on the permanence of markings.


Tantalum chip capacitors should be kept in storage conditions comparable to working conditions. The solderability of the chips will deteriorate if they are exposed to high temperatures, high humidity, corrosive atmospheres, or long-term storage over extended periods of time; nevertheless, the chips themselves are quite resilient in other settings. High temperatures will also cause the materials used for packing to deteriorate; for example, reels may get softer or distort, and the tape peel force may become more difficult to achieve.

As recommended by KEMET, the maximum storage temperature should not exceed 40 degrees Celsius, and the maximum storage humidity should not exceed 60 percent relative humidity. Temperature swings should be kept to a minimum to prevent condensation from forming on the components. The surrounding atmosphere should be devoid of any compounds that contain chlorine or sulfur. Chip stock must be used as soon as possible, preferably within three years after receipt, to maintain its optimal solderability.

Ripple Current/Ripple Voltage

AC ripple voltage and current levels directly relate to the device’s equivalent series resistance (ESR) and power dissipation capacity. Two things limit how much ripple voltage you can put on an AC current:

  • The positive peak AC power of the capacitor and any DC bias voltage must not add up to more than the DC voltage rating of the capacitor.
  • When the negative peak AC voltage is added to any bias voltage, if there is one, the total can’t be higher than what is allowed for the reverse voltage.

Using the table on the right, you can figure out how much power can be lost by the case size. If the operating environment temperature goes up, the maximum power dissipation rating in the table needs to go down.

Reverse Voltage

Because solid tantalum capacitors are polar devices, they can be broken in ways that can’t be fixed or become useless if connected incorrectly. There is a stripe on the body of the capacitor that shows where the positive terminal is. In some cases, there is also a beveled edge. According to the chart, a small amount of transient reverse voltage for a short time is fine. Even if the capacitors work within these limits, they shouldn’t always run in reverse mode.


In conclusion, the KEMET T491 surface mount capacitor is a great choice for decoupling and filtering applications in a wide range of end products. It has the best performance and value because it uses solid tantalum technology and the latest materials, processes, and automation. The T491 meets or goes above EIA standard 535BAAC. It also has a moisture sensitivity level of 1, which means it will last for a long time. The T491 is a reliable component that comes in various capacitance, tolerance, and voltage options and can be soldered in several ways. Its value increases even more because it is RoHS-compliant, doesn’t contain halogens in its epoxy, and follows environmental laws. To keep it working at its best, it needs to be stored correctly and soldered with care. Overall, the KEMET T491 is a great choice for surface mount designs requiring reliable, high-quality capacitors.

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