T491A106K010AT - 10uF 10V Tantalum Capacitor 1206 | KEMET
MPN: T491A106K010AT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.26 | $0.26 |
| 10 | $0.22 | $2.20 |
| 100 | $0.185 | $18.50 |
| 500 | $0.165 | $82.50 |
| 1,000 | $0.155 | $155.00 |
T491A106K010AT Overview
A solid tantalum capacitor is a polarized capacitor that uses tantalum metal as the anode with manganese dioxide (MnO2) as the solid electrolyte. Within the passive component hierarchy, it belongs to the capacitor family alongside ceramic and aluminum electrolytic types, and it is valued for high volumetric capacitance, stable electrical parameters over temperature, and no dry-out failure mode. The T491 series is KEMET's industrial-grade MnO2 molded tantalum line, designed specifically for highly automated surface-mount assembly processes.
Key features of the T491A106K010AT include a rated voltage of 10 V at 85 C (derated at 125 C), a tight 10% capacitance tolerance (K code), and a specified ESR of 3.8 Ohms, which suits medium-frequency decoupling and bulk filtering. The molded case provides mechanical protection and improved solder-joint reliability versus uncoated chips. The part is RoHS compliant, MSL 1 rated, and supplied tape and reel for automated pick-and-place.
Technically, the MnO2 solid electrolyte is self-healing: fault sites convert MnO2 to lower-conductivity Mn2O3, limiting catastrophic short-circuit risk compared with wet electrolytics. Capacitance remains stable across -55 C to +125 C, making the series suitable for demanding industrial environments.
Typical applications include general-purpose power-supply input/output filtering, power decoupling for microcontrollers and FPGA rails, and industrial instrumentation where board space and reliability matter.
When designing, apply proper voltage derating - KEMET recommends operating at 50% or less of rated voltage for maximum reliability in high-impedance circuits - and observe correct polarity, since reverse bias degrades the dielectric.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for T491A106K010AT 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:
T491A106M010AT
β Drop-Inπ Reference alternative (not in catalog)
T491A106K016AT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
T491A106K010ZT
β Drop-Inπ Reference alternative (not in catalog)
TAJA106K010RNJ
β Drop-Inπ Reference alternative (not in catalog)
TAJA106K016RNJ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
293D106X0010A2T
β Drop-Inπ Reference alternative (not in catalog)
T491A106K010AT Maximum Ratings & Electrical Characteristics
| Capacitance | 10 uF |
| Capacitance Tolerance | Β±10% (K) |
| Rated Voltage | 10 V @ 85 C |
| ESR | 3.8 Ohm |
| Dielectric | MnO2 (Solid Tantalum) |
| Construction | Molded, Polarized |
| Package / Case | 1206 (3216 Metric), EIA Case A |
| Package Dimensions | 3.2 x 1.6 x 1.6 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -55 C to +125 C (voltage derated above 85 C) |
| Series | T491 Industrial Grade |
| Mounting Style | SMD, inward L-formation termination |
| MSL Rating | MSL 1 |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (T/R) |
T491A106K010AT Pin Configuration
| Pin 1 | Positive Terminal (+) β Anode termination, marked with bar/bevel on case |
| Pin 2 | Negative Terminal (-) β Cathode termination, connect to ground |
Typical Applications
T491A106K010AT is suitable for 6 applications: Power Supply Input/Output Filtering, FPGA and Microcontroller Power Decoupling, Industrial Automation and Control Equipment, Test and Measurement Instrumentation, Networking and Communication Equipment, Consumer and Portable Electronics.
Power Supply Input/Output Filtering
The T491A106K010AT provides bulk input and output filtering for linear regulators and DC-DC converter modules. Its 10 uF capacitance and 3.8 Ohm ESR give it sufficient charge storage to hold rails stable during load transients, while the ESR value itself supplies damping that suppresses LC anti-resonance when combined with ceramic capacitors. In a typical design the part sits at the VIN and VOUT pins of an LDO or buck regulator rated for 5 V or lower rails, respecting the 50% voltage derating rule for solid tantalum reliability. Because the MnO2 solid electrolyte does not dry out, filtering performance remains stable over the product lifetime, a key advantage over aluminum electrolytics in industrial equipment with 10-year service expectations. Ceramic bypass capacitors of 100 nF should still be placed locally at each IC.
Recommended
FPGA and Microcontroller Power Decoupling
For FPGA and MCU rails, the T491A106K010AT serves as mid-frequency bulk decoupling that bridges the gap between 100 nF ceramic decoupling at each pin and board-level bulk supply capacitance. Its 10 uF value supports logic core rails at 1.2 V to 3.3 V with ample margin below the 10 V rating, and its 3.8 Ohm ESR damps resonances that arise when many low-ESR MLCCs are paralleled, preventing impedance peaks that amplify noise. Placed near the point of load regulator output, it holds the rail during simultaneous switching events. Designers should note that tantalum failure is inverse-derating sensitive: on 5 V rails use this 10 V part, on 3.3 V rails a 6.3 V rated variant offers equivalent 50% derating with lower cost and smaller case size options in the T491 family.
Recommended
Industrial Automation and Control Equipment
The T491 series is explicitly engineered by KEMET as an industrial-grade MnO2 molded tantalum family for automated surface-mount processing, making the T491A106K010AT a natural fit for PLC I/O modules, motor-drive control boards, and factory sensors. Its -55 C to +125 C operating range with voltage derating above 85 C tolerates hot electrical cabinets, while the molded case resists mechanical stress from thermal cycling and board flex. The solid electrolyte construction has no liquid electrolyte to evaporate, so capacitance does not drift with age - critical for equipment designed for a decade of continuous operation. Recommended practice is 50% voltage derating on 24 V-derived 5 V auxiliary rails and correct polarity observance, as tantalum reverse-bias tolerance is limited to short transients of about 10% of rated voltage.
Recommended
Test and Measurement Instrumentation
Bench instruments, DAQ modules, and oscilloscope front-end boards use the T491A106K010AT to stabilize analog supply rails where measurement accuracy depends on low rail drift. The 10% tolerance (K code) keeps the actual decoupling capacitance predictable across production units, and the MnO2 dielectric's stable, low-leakage behavior over temperature preserves rail integrity during warm-up from room temperature to operating condition. Compared with MLCCs, the Class II ceramic capacitance derating under DC bias (often -50% or more) does not occur in tantalum: the delivered 10 uF remains close to nominal at working voltage, giving deterministic filtering. Layout practice calls for locating the part at the regulator output with short, wide traces to minimize added inductance ahead of local ceramic bypasses.
Recommended
Networking and Communication Equipment
Switches, routers, and optical modules employ the T491A106K010AT on PHY, MAC, and memory supply rails where board height is constrained: at 1.6 mm, the 1206 tantalum fits under standard heatsinks and module cages where tall electrolytics cannot. The 10 uF capacitance handles burst current demands of Gigabit PHYs during packet traffic, and the 3.8 Ohm ESR aids transient damping on distributed rails. Solid tantalum's no-dry-out construction supports the continuous-duty requirements of always-on network infrastructure, and its tape-and-reel supply format supports high-speed automated placement in dense SMT production. Designers should place one part per rail domain and pair with 100 nF ceramics at each PHY supply pin for high-frequency decoupling.
Recommended
Consumer and Portable Electronics
In set-top boxes, LED TV boards, chargers, and audio accessories, the T491A106K010AT filters adapter-derived DC rails where its compact 3.2 x 1.6 x 1.6 mm footprint and 1.6 mm low profile support slim product architectures. The molded case tolerates reflow profiles used in high-volume consumer assembly, and MSL 1 rating eliminates floor-life and baking concerns on fast-moving lines. Its stable 10 uF value with 10% tolerance ensures audio path and standby rails behave consistently across manufacturing lots, and the solid MnO2 construction avoids the venting and drying issues of aluminum electrolytics in sealed enclosures. Cost per capacitance is competitive at volume, with distributor pricing near $0.155 at 1000 pieces as of 2026-09-06.
Recommended
Recommended Products Summary
Engineering reference data for T491A106K010AT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | T491A106M010AT | T491A106K016AT | TAJA106K010RNJ | 293D106X0010A2T |
|---|---|---|---|---|---|
| Package | 1206 (3216 Metric, Case A) | 1206 (3216 Metric, Case A) - same | 1206 (3216 Metric, Case A) - same | 1206 (3216 Metric, Case A) - same | 1206 (3216 Metric, Case A) - same |
| Brand | KEMET | KEMET | KEMET | KYOCERA AVX | Vishay |
| Capacitance | 10 uF | 10 uF | 10 uF | 10 uF | 10 uF |
| Rated Voltage | 10 V | 10 V | 16 V | 10 V | 10 V |
| Tolerance | Β±10% | Β±20% | Β±10% | Β±10% | Β±20% |
| Dielectric | MnO2 Solid Tantalum | MnO2 Solid Tantalum | MnO2 Solid Tantalum | MnO2 Solid Tantalum | MnO2 Solid Tantalum |
| Operating Temperature | -55 C to +125 C (derated >85 C) | -55 C to +125 C (derated >85 C) | -55 C to +125 C (derated >85 C) | -55 C to +125 C (derated >85 C) | -55 C to +125 C (derated >85 C) |
Key Differentiators
- Tight Β±10% capacitance tolerance (vs T491A106M010AT)
- Higher voltage margin available on same footprint (vs T491A106K010AT (self) vs T491A106K016AT)
- Industrial-grade molded construction (vs 293D106X0010A2T)
Design Notes
Never exceed 50% of the 10 V rating on low-impedance power rails - for the T491A106K010AT that means 5 V maximum on hard voltage-source rails, per KEMET solid tantalum reliability guidelines. Also observe polarity strictly: reverse voltage above roughly 10% of rated value begins degrading the Ta2O5 dielectric. On rework, limit soldering iron contact time to a few seconds per termination to avoid damaging the MnO2 layer.
Place the capacitor directly at the regulator output or point-of-load with short, wide traces to minimize series inductance. Use the standard 1206 (3216) land pattern with two 1.4 x 1.2 mm pads per IPC guidance. Pair the tantalum with a 100 nF X7R MLCC at each IC supply pin: the 3.8 Ohm ESR of the T491A106K010AT damps the low-frequency anti-resonance peak created when many low-ESR ceramics are paralleled on the same rail.
Check ripple current handling when using this part at a buck converter output: Estimated: with 3.8 Ohm ESR, 500 mA rms ripple current produces about 1.9 W of heating (I_rms^2 x ESR = 0.5^2 x 3.8), which is excessive for a Case A tantalum. Keep ripple current below roughly 100-150 mA rms for this ESR class, or select KEMET T598 polymer or AVX TPS low-ESR series for high-ripple switching outputs.
Compliance Information
RoHS compliant per PartGenie and distributor listings (RoHS Y). MSL 1. REACH status not stated in provided data.
