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T491C226K025ATAUTO
KEMET
CAP TANT SMD
26660 Pcs New Original In Stock
Tantalum Capacitors
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (165 Ratings)
T491C226K025ATAUTO
Product Overview
11210035
DiGi Electronics Part Number
T491C226K025ATAUTO-DGManufacturer
KEMET
T491C226K025ATAUTO
Description
CAP TANT SMDInventory
26660 Pcs New Original In Stock
Tantalum Capacitors
Quantity
Minimum 1
Minimum 1
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T491C226K025ATAUTO Technical Specifications
Category
Tantalum Capacitors
Packaging
Tape & Reel (TR)
Series
*
Product Status
Active
Datasheet & Documents
HTML Datasheet
T491C226K025ATAUTO-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8532.21.0050
Additional Information
Other Names
399-T491C226K025ATAUTOTR
399-T491C226K025ATAUTODKR
399-T491C226K025ATAUTOCT
Standard Package
500
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Leur engagement écologique à travers des emballages recyclables me touche profondément.
Dec 02, 2025
The checkout process is secure and straightforward, giving me peace of mind.
Dec 02, 2025
I appreciate the high standards of quality control that ensure every item is perfect out of the box.
Dec 02, 2025
The logistics tracking system at DiGi Electronics is top-notch. I could see exactly when my package was shipped, in transit, and out for delivery, which helped me plan my day accordingly.
Dec 02, 2025
I love how accessible and friendly their customer service team is.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the T491C226K025ATAUTO in power supply decoupling circuits for automotive applications?
When using the T491C226K025ATAUTO in automotive power supply decoupling, engineers must account for its 22μF capacitance and 25V rating, which may limit effectiveness in high-current transient scenarios. A major risk is voltage derating—tantalum capacitors like the T491C226K025ATAUTO should be operated at 50% voltage derating (max 12.5V applied) to avoid thermal runaway, especially in environments with temperature swings. Additionally, pair it with a low-ESR ceramic capacitor to handle high-frequency noise, as the T491C226K025ATAUTO has higher ESR than ceramic alternatives. Always verify surge current handling in cold-start conditions common in automotive systems.
How does the T491C226K025ATAUTO compare to the GRM32DR71H226KA01K in terms of reliability and failure modes when used in safety-critical automotive modules?
The T491C226K025ATAUTO (tantalum) and GRM32DR71H226KA01K (ceramic) both offer 22μF at 25V, but differ significantly in failure behavior. The T491C226K025ATAUTO can fail short-circuit under overvoltage or surge conditions, potentially leading to thermal events without proper current limiting. In contrast, the GRM32DR71H226KA01K fails open-circuit more predictably. For safety-critical systems (e.g., ADAS), the T491C226K025ATAUTO requires stricter design controls—include current limiters and transient protection. However, the T491C226K025ATAUTO offers superior volumetric efficiency and stable capacitance over temperature compared to ceramics that suffer from DC bias degradation.
Can the T491C226K025ATAUTO be used as a direct replacement for the C3216X5R1H226K160AB in a reflow-soldered automotive PCB assembly?
Direct replacement of the C3216X5R1H226K160AB with the T491C226K025ATAUTO is mechanically feasible due to similar 1206 SMD footprint, but introduces electrical and thermal risks. The T491C226K025ATAUTO has tighter voltage derating requirements—where the ceramic C3216X5R1H226K160AB can operate near its rated voltage, the T491C226K025ATAUTO must be derated to 50% (12.5V max) to meet AEC-Q200 reliability standards. Also, verify peak reflow temperature tolerance: while the T491C226K025ATAUTO has MSL 1 (unlimited floor life), its manganese dioxide electrolyte is sensitive to thermal shock. Control ramp rates during reflow to avoid cracking or increased leakage current.
What thermal management considerations should be addressed when placing the T491C226K025ATAUTO near high-power components in an engine control unit?
When placing the T491C226K025ATAUTO near high-power ICs or MOSFETs in an ECU, thermal management is critical due to the inherent sensitivity of tantalum capacitors to temperature. The T491C226K025ATAUTO has a maximum operating temperature of 125°C, but its lifetime halves for every 10°C rise above 85°C. Avoid direct thermal coupling—use thermal relief traces and consider adding a small thermal barrier or air gap. Monitor ripple current; excessive RMS current in high-temperature zones can lead to internal heating and catastrophic failure. Simulate thermal performance in your layout and ensure total internal temperature (ambient + self-heat) stays below 105°C for robust operation.
How does the long-term reliability of the T491C226K025ATAUTO perform in high-humidity environments without conformal coating?
The T491C226K025ATAUTO, while RoHS3 compliant and MSL 1 rated, is susceptible to moisture ingress over time if used in high-humidity environments without conformal coating. Although the polymer termination and sealed construction offer some protection, prolonged exposure to condensation can lead to leakage current increase and eventual corrosion, especially in underhood automotive applications. For uncoated designs, avoid locations with direct exposure to washdown or temperature cycling. If conformal coating is not feasible, consider adding a humidity-resistant negative bias to the circuit or selecting an enhanced-hermetic version. Monitor field failure data closely when using the T491C226K025ATAUTO in non-hermetic conditions to ensure MTBF targets are met.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
T491C226K025ATAUTO CAD Models
KEMET T491C226K025ATAUTO PCB symbols & footprints
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