Is there a pin-compatible replacement for T491D475K050AT?

No, the candidates reviewed are in smaller MLCC packages (e.g., 0805) and are not pin-compatible with the larger 7343-31 tantalum case. A board redesign is necessary.

What risks should I check before replacing T491D475K050AT?

Key risks include: 1) Physical package mismatch. 2) Capacitance drop in MLCCs under DC voltage (DC bias). 3) Lower ESR of MLCCs potentially causing circuit instability. 4) The original is polarized, MLCCs are not.

T491D475K050AT Alternatives, Datasheet & Cross Reference | KEMET

T491D475K050AT is a 4.7µF 50V solid tantalum capacitor in a 7343-31 package. While direct replacements are unavailable, MLCCs can serve as functional alternatives but require board redesign and careful electrical validation.

AI replacement insight

Package riskhigh

Requires PCB redesign as MLCC footprints do not match the Tantalum case.

Electrical riskhigh

DC bias, ESR, and polarity differences must be validated in the application.

Sourcing risklow

Proposed MLCC alternatives are generally high-volume, multi-source components.

Can it be replaced directly?

There is no direct, drop-in replacement for T491D475K050AT. All alternatives require significant design changes.

Best replacement path

Redesign the PCB to accommodate a modern, widely available MLCC like an 0805 or 1210 package and validate circuit performance.

Main risk

The primary risk is the technology change from Tantalum to MLCC, which impacts effective capacitance (DC bias) and circuit stability (ESR).

Recommended alternatives

Functional alternative with different package and technology. Requires significant engineering review.

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Alternative comparison matrix

Feature / factor	T491D475K050AT	GRM21BZ71H475KE15K	GRM21BC71H475KE11L	Compatibility / risk
Package	7343-31 (D)	0805 (2012 metric)	0805 (2012 metric)	0805 (2012 metric) — Not a drop-in replacement, requires PCB redesign.; GRM21BC71H475KE11L: Not a drop-in replacement, requires PCB redesign.
Technology	Tantalum	MLCC (X7R)	MLCC (X7S)	MLCC (X7R) / MLCC (X7S) — Change from polarized Tantalum to non-polarized MLCC. Check DC bias and ESR.; GRM21BC71H475KE11L: Change from Tantalum to MLCC. X7S dielectric has different stability from target.
Voltage	50.0V	50.0V	50.0V	50.0V — Voltage rating matches, but DC bias will reduce effective capacitance.; GRM21BC71H475KE11L: Voltage rating matches, but DC bias will reduce effective capacitance.
Temperature	-55°C to +125°C	-55°C to +125°C	-55°C to +125°C	-55°C to +125°C — Operating temperature range matches.; GRM21BC71H475KE11L: Operating temperature range matches.

Application & sourcing insights

Questions & answers

No direct drop-in replacement exists. MLCCs like Murata's GRM21BZ71H475KE15K are functional alternatives but require a new PCB layout and careful review of DC bias and ESR effects.