Is there a pin-compatible replacement for T491B106K025AT?

No pin-to-pin verified replacements have been identified. Candidates like T491D106K050AT have different package sizes, requiring PCB layout changes. Always verify the package dimensions and land pattern before substitution.

What risks should I check before replacing T491B106K025AT?

Key risks include package size mismatch, which requires board redesign. When switching from Tantalum to MLCC capacitors, review DC bias voltage derating, ESR characteristics, and potential for acoustic noise or micro-cracking.

T491B106K025AT Alternatives, Datasheet & Cross Reference | KEMET

T491B106K025AT is a 10µF, 25V, ±10% solid tantalum capacitor from KEMET in a 3528-21 (B case) package. This page reviews potential alternatives, considering electrical parameters and physical compatibility.

AI replacement insight

Package riskhigh

All viable candidates have different packages, requiring PCB redesign.

Electrical riskmedium

Switching to MLCCs introduces different performance characteristics like DC bias derating and ESR profile.

Can it be replaced directly?

No direct drop-in replacement has been confirmed. All reviewed candidates have different package sizes or are a different capacitor technology (MLCC), requiring design review.

Best replacement path

Upgrade within the same KEMET T491 series to a part like T491D106K050AT, provided the larger D-case package can be accommodated on the PCB.

Main risk

The primary risk is physical incompatibility due to different package sizes. A secondary risk involves changing capacitor technology from Tantalum to MLCC, which affects electrical behavior.

Recommended alternatives

A functional alternative from the same KEMET series with a higher voltage rating but in a larger package.

View details

Alternative comparison matrix

Feature / factor	T491B106K025AT	T491D106K050AT	GRM32ER71H106KA12L	Compatibility / risk
Package	3528-21 (B Case)	7343-31 (D Case)	1210 (3225 Metric)	7343-31 (D Case) / 1210 (3225 Metric) — Candidate is physically larger and not a drop-in replacement.; GRM32ER71H106KA12L: Similar but not identical footprint to 3528-21.
Voltage	25V	50V	50V	50V — Higher voltage rating provides more design margin.; GRM32ER71H106KA12L: Higher voltage rating provides more margin.
Capacitance	10µF	10µF	10µF	10µF — matched; GRM32ER71H106KA12L: matched
Esr	2.0Ω	800mΩ	-	800mΩ — Lower ESR is generally beneficial.
Technology	Tantalum	-	MLCC (X7R)	MLCC (X7R) — Switching from Tantalum to MLCC requires engineering review.

Application & sourcing insights

Questions & answers

T491D106K050AT from the same KEMET series offers a higher voltage rating (50V) but comes in a larger package (7343-31 D case). For different technologies, Murata's GRM32ER71H106KA12L is an MLCC option with a 50V rating in a 1210 package, but requires engineering review.