Is there a pin-compatible replacement for T491B226K016AT?

A direct pin-compatible replacement is not identified. Alternatives exist within the same family but in different case sizes (C-Case, D-Case), which are not physically interchangeable without board redesign.

What risks should I check before replacing T491B226K016AT?

Key risks include package size mismatch requiring PCB changes, and differences in ESR. When considering other technologies like MLCCs, also check DC bias effects, leakage current, and failure modes.

T491B226K016AT Alternatives, Datasheet & Cross Reference | KEMET

T491B226K016AT is a 22µF 16V tantalum capacitor in a 3528 B-Case. Finding a substitute requires matching capacitance and tolerance while carefully checking package size and voltage rating.

AI replacement insight

Package riskhigh

Alternatives are in different case sizes (C-Case, D-Case) and are not drop-in.

Electrical risklow

Tantalum alternatives offer improved voltage and ESR ratings.

Can it be replaced directly?

No direct drop-in replacement has been identified. All functional alternatives require a review of the physical package size.

Best replacement path

Upgrade within the KEMET T491 series to a higher voltage part like T491C226K025AT, if the larger C-Case package is acceptable.

Main risk

The primary risk is the physical package mismatch. All reviewed functional alternatives are in larger case sizes, requiring a PCB redesign.

Recommended alternatives

Functional alternate with higher voltage rating but in a larger package that is not a drop-in fit.

View details

Alternative comparison matrix

Feature / factor	T491B226K016AT	T491C226K025AT	T491D226K035AT	Compatibility / risk
Package	3528-21 (B-Case)	6032-28 (C-Case)	7343-31 (D-Case)	6032-28 (C-Case) / 7343-31 (D-Case) — Candidate is physically larger, requires PCB change.; T491D226K035AT: Candidate is physically larger, requires PCB change.
Voltage	16V	25V	35V	25V / 35V — Higher voltage rating provides more design margin.; T491D226K035AT: Higher voltage rating provides more design margin.
Esr	2.2Ω	1.4Ω	0.7Ω	1.4Ω / 0.7Ω — Lower ESR is generally beneficial.; T491D226K035AT: Lower ESR is generally beneficial.
Capacitance	22µF	22µF	22µF	22µF — matched; T491D226K035AT: matched
Temperature	-55°C to +125°C	-55°C to +125°C	-55°C to +125°C	-55°C to +125°C — matched; T491D226K035AT: matched

Application & sourcing insights

Questions & answers

The best alternatives are often other KEMET T491 series capacitors like T491C226K025AT, which offer higher voltage ratings but require a PCB layout change due to a larger package size.