T491A105K035AT
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| Part Number | T491A105K035AT |
|---|---|
| Manufacturer |
 Kemet
|
| Description |
The T491A105K035AT is a general-purpose, surface-mount 1µF 35V solid tantalum capacitor manufactured by KEMET, a member of the YAGEO Group. Designed for electronic circuits requiring stable capacitive performance, low DC leakage current, and compact physical dimensions, the device combines manganese dioxide (MnO2) solid electrolyte technology, ±10% capacitance tolerance, and a standard 1206 (3216 Metric) A-case package. The T491A105K035AT belongs to the KEMET T491 series of commercial-grade solid tantalum surface-mount capacitors. This product family is designed for general-purpose electronic applications requiring reliable capacitance, compact SMT construction, and compatibility with automated electronics manufacturing processes. The device provides a nominal capacitance of 1µF (1000nF or 1000000pF) with a specified capacitance tolerance of ±10%. The tolerance corresponds to an initial capacitance range of approximately 0.9µF to 1.1µF under the manufacturer's reference measurement conditions. The T491A105K035AT features a rated DC working voltage of 35V at temperatures up to +85°C. This rating makes it suitable for a variety of low-voltage and moderate-voltage electronic circuits, including power supply filtering, voltage regulator output networks, and general-purpose DC decoupling applications. For operation above +85°C, the maximum permissible working voltage must be reduced according to the manufacturer's voltage derating requirements. At the maximum specified operating temperature of +125°C, the rated working voltage is reduced to 23.45V DC. The capacitor uses a solid manganese dioxide (MnO2) electrolyte with a tantalum-based dielectric system. Unlike wet electrolytic capacitors, solid tantalum capacitors do not rely on a liquid electrolyte, allowing the component to maintain a compact molded construction and providing useful electrical characteristics for general-purpose electronic applications. The internal construction consists of a tantalum anode, a tantalum pentoxide dielectric layer, and a solid manganese dioxide cathode system. These materials form a polarized electrolytic capacitor with relatively high capacitance density compared with many alternative capacitor technologies of similar physical dimensions. A significant characteristic of the T491A105K035AT is its specified equivalent series resistance (ESR) of 7Ω maximum at 100kHz and +25°C. ESR represents the resistive component of the capacitor's impedance and contributes to power dissipation when alternating or ripple currents flow through the component. The ESR characteristic must be considered when selecting the capacitor for power supply filtering and decoupling circuits. Although the T491A105K035AT is suitable for many general-purpose filtering applications, its 7Ω ESR makes it less appropriate for high-ripple-current circuits requiring very low ESR capacitors. The capacitor provides a maximum specified DC leakage current of 0.5µA, measured under the manufacturer's specified conditions after a five-minute voltage application at +25°C. Low leakage current is useful in circuits where excessive DC leakage could affect power consumption, bias voltages, or measurement accuracy. This low leakage characteristic supports applications such as analog signal conditioning, reference voltage filtering, low-current power supply networks, and general-purpose electronic circuits requiring predictable DC capacitor behavior. The T491A105K035AT features a maximum specified dissipation factor of 4%, measured at 120Hz and +25°C. Dissipation factor describes energy losses within the capacitor under alternating electrical excitation and is an important parameter when evaluating capacitor performance in filtering and power management applications. The device supports a maximum specified RMS ripple current of 100mA at 100kHz and +25°C. Ripple current capability indicates the allowable alternating current through the capacitor under the applicable measurement and thermal conditions. As the operating temperature increases, the permissible ripple current decreases. The manufacturer specifies approximately 90mA RMS at +85°C and 40mA RMS at +125°C, under the corresponding rated conditions. These ripple current limits are important in switching power supply circuits, voltage regulators, and other electronic systems where alternating current components flow through the capacitor. Designers should ensure that the expected ripple current remains within the manufacturer's specified limits to avoid excessive internal heating. The T491A105K035AT is specified for an operating temperature range of -55°C to +125°C. This wide temperature capability supports use in industrial electronic equipment, embedded control systems, instrumentation, and general-purpose electronic assemblies exposed to varying environmental conditions. The capacitor's full 35V working voltage rating applies only within the specified temperature range up to +85°C. Operation at elevated temperatures requires appropriate voltage derating, and the designer should also consider the effects of temperature on leakage current, ESR, capacitance, and long-term reliability. As a polarized solid tantalum capacitor, the T491A105K035AT must be installed with the correct electrical polarity. The positive terminal must be connected to the appropriate positive circuit potential relative to the negative terminal. Unlike non-polarized multilayer ceramic capacitors, solid tantalum capacitors are not intended for continuous reverse-voltage operation. Incorrect polarity, excessive voltage, or high surge currents can damage the capacitor and may result in overheating or catastrophic failure. The capacitor should therefore be used only within the manufacturer's recommended electrical operating conditions. Appropriate voltage derating, current limiting, and protection against voltage transients are particularly important in low-impedance power supply circuits. For improved reliability, KEMET recommends applying suitable voltage derating practices according to the circuit's operating conditions and the applicable T491 series design guidelines. The required derating depends on factors such as circuit impedance, surge current exposure, temperature, and the intended application. The T491A105K035AT is particularly useful in DC power supply filtering applications. When connected across a suitable power supply rail, the capacitor can help reduce voltage fluctuations and provide localized energy storage for connected electronic circuits. In voltage regulator circuits, the capacitor may be used as part of an input or output filtering network. Its capacitance and ESR characteristics must be checked against the voltage regulator manufacturer's stability and output capacitor requirements before use. The capacitor can also provide power supply decoupling for analog and digital electronic circuits. In these applications, the capacitor helps reduce supply voltage disturbances caused by changing circuit loads and provides a local reservoir of electrical charge. For high-frequency decoupling, the T491A105K035AT may be combined with appropriately selected multilayer ceramic capacitors. Ceramic capacitors can provide lower impedance at higher frequencies, while the tantalum capacitor contributes capacitance and damping characteristics to the overall power distribution network. In DC-DC converter applications, the capacitor may be used in suitable filtering or auxiliary decoupling networks. Designers must verify that the converter's ripple current, transient voltage, and output stability requirements are compatible with the capacitor's specified characteristics. The T491A105K035AT is also suitable for analog circuit filtering, where its capacitance can be used in appropriately designed low-pass filtering, power rail conditioning, and signal stabilization networks. The capacitor's polarity and DC bias conditions must be considered in these applications. In industrial control equipment, the capacitor can support power management circuits, local voltage filtering, and general-purpose electronic functions. Its compact package and extended operating temperature range make it suitable for a wide variety of industrial electronic assemblies. The device can also be used in embedded electronic systems, including microcontroller-based control boards, interface modules, monitoring equipment, and compact electronic products requiring surface-mount tantalum capacitors. In test and measurement instrumentation, the capacitor can be used for local supply decoupling, analog circuit filtering, and auxiliary power conditioning. Its specified leakage current and capacitance tolerance help designers evaluate suitability for applications where predictable capacitor behavior is required. The T491A105K035AT is supplied in a compact 1206 surface-mount package, also identified as 3216 Metric or EIA A Case. The nominal package body dimensions are 3.20mm length, 1.60mm width, and 1.60mm height. The manufacturer's dimensional specification provides a length tolerance of ±0.20mm, a width tolerance of ±0.20mm, and a height tolerance of ±0.20mm. The corresponding maximum nominal package height is therefore approximately 1.80mm. The compact A-case package occupies approximately 5.12mm² of nominal PCB body area, making the component suitable for space-constrained circuit boards and high-density surface-mount electronic assemblies. The capacitor features a molded resin body that protects the internal tantalum capacitor structure and provides mechanical durability during normal component handling and PCB assembly. The molded package is designed for compatibility with standard automated surface-mount manufacturing processes. The T491A105K035AT uses tin-finished surface-mount terminations, supporting compatibility with lead-free soldering processes. The external terminals provide electrical and mechanical connections between the capacitor and the printed circuit board. Because the component is polarized, the package includes a polarity identification marking. During PCB assembly, the component orientation must be verified against the manufacturer's package marking convention and recommended PCB footprint. Proper PCB land pattern design and soldering procedures are important for achieving reliable assembly. Designers should follow the manufacturer's recommendations for solder pad dimensions, solder paste application, reflow temperature profiles, and component handling. The T491A105K035AT is listed as RoHS compliant and uses a lead-free tin termination finish. These characteristics support integration into electronic products manufactured under applicable restrictions on hazardous substances. The capacitor has a manufacturer-specified Moisture Sensitivity Level of MSL 1. This classification indicates that the component has the lowest moisture sensitivity classification under the applicable surface-mount component handling standard. The manufacturer specifies a nominal shelf life of 156 weeks under the applicable storage conditions. Appropriate storage and handling procedures should be followed to maintain solderability and component condition before assembly. The T491A105K035AT belongs to the commercial-grade T491 series and is not designated as an AEC-Q200-qualified automotive capacitor. Applications requiring automotive component qualification should use a specifically qualified product and verify the relevant manufacturer documentation. The manufacturer identifies the T491A105K035AT as a general-purpose molded tantalum capacitor. Its selection for a particular application should account for capacitance, operating voltage, temperature, leakage current, ESR, ripple current, surge conditions, and expected service life. The device is supplied in tape-and-reel packaging with a nominal reel diameter of 178mm. The standard manufacturer package quantity is 2000 capacitors per reel, making it suitable for automated pick-and-place assembly and high-volume SMT manufacturing. The ordering designation T491A105K035AT identifies the KEMET T491 series, A-case package, 1µF nominal capacitance, ±10% tolerance, 35V rated voltage, and the applicable surface-mount ordering configuration. The combination of 1µF capacitance, ±10% tolerance, 35V DC rated voltage at +85°C, 23.45V DC operation at +125°C, 7Ω maximum ESR at 100kHz, 0.5µA maximum DC leakage current, 4% maximum dissipation factor, 100mA RMS ripple current at +25°C, -55°C to +125°C operating temperature range, and compact 1206 A-case packaging makes the T491A105K035AT a practical choice for general-purpose power supply filtering and electronic decoupling applications. The T491A105K035AT is suitable for DC power supply filtering, voltage regulator input and output networks, power rail decoupling, local energy storage, DC-DC converter auxiliary filtering, analog power supply conditioning, industrial electronic equipment, embedded control systems, microcontroller power management, instrumentation circuits, telecommunications equipment, consumer electronics, electronic interface modules, low-current monitoring circuits, general-purpose signal filtering, compact SMT electronic assemblies, industrial automation, test and measurement equipment, and general-purpose solid tantalum capacitor applications. |
| Product Group | Tantalum Capacitor |
| MOQ | 2000 pcs |
| SPQ | 2000 pcs |
| Figure/Case | 1206 |
| Package | T&R Pack |
 PDF Datasheet | |
| Ship From | Hong Kong |
| Shipment Way | DHL / Fedex / TNT / UPS / Others |
| Delivery Term | Ex-Works |
| Send RFQ | sales@signalhk.com |
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T491A105K035AT
T491A105K035AT