T491D106K016AT - 10uF 16V Tantalum SMD Cap | KEMET
MPN: T491D106K016AT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
T491D106K016AT Overview
A solid tantalum capacitor is a polarized fixed capacitor that uses tantalum metal as the anode and manganese dioxide (MnO2) as the solid electrolyte, replacing the wet electrolyte of aluminum electrolytic types. Within the passive-component hierarchy, it sits under capacitors, then electrolytic capacitors, then tantalum capacitors. Compared with MLCCs, tantalum types offer high volumetric efficiency and stable capacitance independent of applied DC bias.
Key features of the T491D106K016AT include its molded construction for mechanical robustness during reflow, 100% surge-current testing in the T491 series flow, and the wide availability of the D case footprint shared across the T491 family. The 16 V rating provides comfortable derating margin when used on 5 V or 12 V rails, following the common practice of applying the part at 50% or less of rated voltage for maximum reliability.
Technically, the solid MnO2 electrolyte gives the device a defined, benign failure mode relative to older wet-tantalum designs, and its capacitance remains essentially stable under DC bias, unlike class II ceramic dielectrics. The K designation denotes the 10% tolerance, tighter than the M (20%) option, simplifying timing and filtering calculations.
Typical applications include decoupling and bulk energy storage on microcontroller and FPGA power rails, output filtering of low-voltage DC-DC converters, and analog supply bypassing in industrial, telecom, and consumer boards where PCB space and reliability matter.
Design consideration: tantalum capacitors are polarized, so reverse-voltage exposure must be avoided, and derating of applied voltage is recommended. ESR should be verified against the specific case code in the manufacturer datasheet before use in switching-regulator output loops.
This page synthesizes verified distributor data, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for T491D106K016AT β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
T491D106M016AT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
T491D106K020AT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
T491D106K025AT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
T491D106K010AT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
TAJD106K016RNJ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
T491D106K016AT Maximum Ratings & Electrical Characteristics
| Capacitance | 10 uF |
| Capacitance Tolerance | 10% (K) |
| Rated Voltage (DC) | 16 V |
| Dielectric / Electrolyte | Solid Tantalum / MnO2 |
| Series | T491 (Molded, SMD) |
| Case Code | D |
| Package Size | 2917 (7343 Metric), 7.3 x 4.3 mm |
| Mounting Type | Surface Mount |
| Polarity | Polarized |
| Failure Mode | Solid electrolyte (MnO2) |
T491D106K016AT Pin Configuration
| Pin 1 | Positive terminal (+) β Anode termination - marked with polarity stripe/band on case |
| Pin 2 | Negative terminal (-) β Cathode termination - case body side without polarity marking |
Typical Applications
T491D106K016AT is suitable for 6 applications: Microcontroller Power Rail Decoupling, DC-DC Converter Output Filtering, Industrial Control Board Bulk Storage, Analog Signal Chain Supply Bypassing, Telecom Line Card Power Distribution, Consumer and IoT Device Power Input.
Microcontroller Power Rail Decoupling
The T491D106K016AT provides stable bulk decoupling on 5 V and 3.3 V microcontroller rails, where its 10 uF capacitance remains constant under DC bias unlike class II ceramics that can lose 50% or more of rated capacitance at bias. The 16 V rating gives 3x derating margin on a 5 V rail, aligning with the industry 50%-of-rating reliability practice for solid MnO2 tantalum technology. Placed next to the MCU supply pins together with 0.1 uF ceramic bypass capacitors, it handles low-frequency load transients while the ceramics cover high-frequency noise. The KEMET T491 molded D case withstands reflow profiles used in automated SMT assembly.
Recommended
DC-DC Converter Output Filtering
On buck and boost converter outputs, the T491D106K016AT supplies bulk output capacitance with bias-independent behavior and predictable ESR, which older regulator architectures that require a minimum ESR depend on for loop stability. The solid MnO2 electrolyte tolerates continuous ripple current within the datasheet's power-dissipation limits for the D case, and 100% surge testing in the T491 series flow adds robustness against input transients. Designers must confirm the exact ESR from the KEMET T491 datasheet against the switching regulator's stability window, since both too-high and too-low ESR can destabilize compensation. The 16 V rating covers 12 V bus outputs with margin.
Recommended
Industrial Control Board Bulk Storage
Industrial PLC I/O modules and motor-control interface boards benefit from the T491D106K016AT as local bulk energy storage on 12 V and 5 V sensor-supply rails. The molded 2917 package survives the vibration and reflow handling typical of factory automation builds, and the 10% tolerance tightens bulk-capacitance budgeting for ride-through and inrush calculations. Solid tantalum's failure mode is well characterized compared with wet-electrolyte alternatives, supporting long service intervals. Because industrial environments stress derating, using this 16 V part on 12 V rails (75% of rating) is acceptable only with reduced ripple current; on 24 V systems, step up to the 25 V variant T491D106K025AT.
Recommended
Analog Signal Chain Supply Bypassing
Precision op-amp and ADC supply pins require a quiet, temperature-stable rail; the T491D106K016AT's 10 uF of bias-independent capacitance filters low-frequency supply disturbance without the voltage-coefficient artifacts of class II ceramics. Its stable ESR also avoids the anti-resonance peaks that occur when a very-low-ESR ceramic bulk cap combines with long supply traces. Placed at the entry of the analog supply domain followed by 0.1 uF and 1 nF ceramics at each op-amp pin, it forms a wideband decoupling ladder. The D case's 10% tolerance makes filter corner calculations reliable across production lots.
Recommended
Telecom Line Card Power Distribution
Telecom and networking line cards distribute 5 V and 3.3 V across many subsystems, and the T491D106K016AT serves as intermediate bulk storage at each subsystem entry point, damping supply sag during simultaneous line activity. The high volumetric efficiency of the 7343 D case delivers 10 uF in minimal board area, valuable on dense cards, and solid MnO2 construction withstands the extended operating hours typical of telecom infrastructure. KEMET's T491 series was explicitly designed for automated surface-mount placement, matching the high-volume assembly processes of telecom hardware. Verify ESR against any PoL converter requirements on the card.
Recommended
Consumer and IoT Device Power Input
Smart-home and IoT devices powered from 5 V USB supplies use the T491D106K016AT at the input connector as bulk input capacitance, absorbing cable inductance effects and load bursts from radio transmissions. Its 16 V rating comfortably covers 5 V USB with the recommended tantalum derating, and the 10 uF value suits Wi-Fi module TX burst currents that cause millisecond-scale supply dips. The molded D case passes consumer reflow and handling requirements, and the 10% K tolerance supports predictable inrush and hold-up budgeting. Pair with a 0.1 uF ceramic at the radio module pins for RF-frequency decoupling.
Recommended
Recommended Products Summary
Engineering reference data for T491D106K016AT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | T491D106M016AT | T491D106K020AT | T491D106K010AT | TAJD106K016RNJ |
|---|---|---|---|---|---|
| Brand | KEMET | KEMET | KEMET | KEMET | Kyocera AVX |
| Package | 2917 (7343 Metric) D Case | 2917 (7343 Metric) D Case - same | 2917 (7343 Metric) D Case - same | 2917 (7343 Metric) D Case - same | 2917 (7343 Metric) D Case - same |
| Capacitance | 10 uF | 10 uF | 10 uF | 10 uF | 10 uF |
| Voltage Rating | 16 V | 16 V | 20 V | 10 V | 16 V |
| Tolerance | 10% (K) | 20% (M) | 10% (K) | 10% (K) | 10% (K) |
| Electrolyte Technology | Solid MnO2 tantalum | Solid MnO2 tantalum | Solid MnO2 tantalum | Solid MnO2 tantalum | Solid MnO2 tantalum |
| Series | T491 | T491 | T491 | T491 | TAJ |
Key Differentiators
- Tighter 10% tolerance simplifies bulk-capacitance budgeting (vs T491D106M016AT)
- Higher voltage margin option in same footprint (vs T491D106K020AT)
- Same-case KEMET family consistency (vs TAJD106K016RNJ)
Design Notes
Tantalum capacitors are polarized: reverse voltage above approximately 1 V can degrade or destroy the MnO2 dielectric. On boards subject to user-inserted supplies or reverse-installation risk, add a series diode or ideal-diode protector ahead of the rail feeding T491D106K016AT. Follow the printed polarity band on the case when orienting the part on the 7343 land pattern - the band marks the positive terminal, opposite the convention of many aluminum electrolytics.
Apply the standard solid-tantalum derating rule of using no more than 50% of rated voltage: the 16 V rating of T491D106K016AT suits 5 V rails (31% derating) and 12 V rails with reduced ripple (75% - marginal, prefer T491D106K025AT instead). Before using in a switching-regulator output loop, confirm the ESR from the KEMET T491 datasheet and verify it falls inside the regulator's stability window; adjust with a small series resistor if ESR is too low.
The 7343 D-case land pattern should follow the KEMET T491 datasheet recommended footprint so the solder fillet covers the full termination width; undersized pads reduce ripple-current capability. Place the part within a few millimeters of the supply entry or regulator output, with a 0.1 uF ceramic in parallel for high-frequency bypass. Allow enough spacing for the polarity silkscreen to remain visible after assembly for incoming inspection.
Compliance Information
Compliance data was not present in the verified web data retrieved for this part as of 2026-09-06. Confirm RoHS/REACH/lead-free status via the official KEMET T491 datasheet and KEMET certificate of conformance.
