Is there a pin-compatible replacement for T491A106M020AT?

No, a direct pin-compatible replacement is not available in this list. The target T491A106M020AT uses an A-Case (3216) package, while all reviewed candidates use larger B-Case (3528) or D-Case (7343) packages, making them physically incompatible without a board redesign.

What risks should I check before replacing T491A106M020AT?

The main risk is the package size mismatch, which requires a PCB redesign. You must verify that the larger footprint (e.g., 3528 for B-Case) fits your layout. Also, check for any changes in ESR, as a higher value (like in CA45-B-25V-10uF-M) could affect circuit stability or efficiency.

T491A106M020AT Alternatives, Datasheet & Cross Reference | KEMET

Finding a substitute for the KEMET T491A106M020AT, a 10µF 20V tantalum capacitor, requires careful attention to its compact A-Case (3216) package. While many parts match electrically, they often come in larger packages, necessitating board-level changes.

AI replacement insight

Package riskhigh

All candidates are physically larger, requiring mandatory PCB redesign and validation.

Electrical risklow

Most candidates offer equivalent or superior voltage, tolerance, and ESR. One has slightly higher ESR.

Can it be replaced directly?

No, there are no direct, pin-compatible replacements for T491A106M020AT in the provided list. All candidates have larger physical packages that require PCB layout changes.

Best replacement path

The best path is to find a 10µF, 20V+ tantalum capacitor in the same A-Case (3216) package. If board space allows for a larger B-Case (3528), parts like CA45B-B-25V-10UF-K offer better electrical performance.

Main risk

The primary risk is the physical package mismatch. The target is in a compact A-Case (3216), while all proposed alternatives are in larger B-Case (3528) or D-Case (7343) packages.

Recommended alternatives

Functional alternative with matching voltage and better tolerance, but in a larger B-Case package.

View details

Alternative comparison matrix

Feature / factor	T491A106M020AT	CA45-B-20V-10uF-K	CA45B-B-25V-10UF-K	CA45-B-25V-10uF-M	Compatibility / risk
Package	3216-18 (A-Case)	B (3528)	3528-19 (B-Case)	B (3528)	B (3528) / 3528-19 (B-Case) — Physically larger, requires layout change.; CA45B-B-25V-10UF-K: Physically larger, requires layout change.; CA45-B-25V-10uF-M: Physically larger, requires layout change.
Voltage	20V	20V	25V	25V	20V / 25V — Voltage rating matches the target.; CA45B-B-25V-10UF-K: Higher voltage rating provides more margin.; CA45-B-25V-10uF-M: Higher voltage rating.
Tolerance	±20%	±10%	±10%	±20%	±10% / ±20% — Tighter tolerance.; CA45B-B-25V-10UF-K: Tighter tolerance.; CA45-B-25V-10uF-M: Tolerance matches the target.
Esr	5 Ω	~1.5 Ω	1.4 Ω	6.0 Ω	~1.5 Ω / 1.4 Ω / 6.0 Ω — Lower ESR is generally better.; CA45B-B-25V-10UF-K: Lower ESR is generally better.; CA45-B-25V-10uF-M: Higher ESR may impact circuit performance.

Application & sourcing insights

Questions & answers

The best functional alternative is CA45B-B-25V-10UF-K, which offers higher voltage (25V), tighter tolerance (±10%), and lower ESR (1.4Ω). However, it is in a larger B-Case (3528) package and requires a PCB layout change.