Is there a pin-compatible replacement for CA45-B-16V-33uF-K?

Yes, parts like Vishay's 293D226X9016B2TE3 use the same 3528 B-Case package and are pin-compatible. However, key electrical parameters like capacitance differ, so they are not drop-in replacements without verification.

What risks should I check before replacing CA45-B-16V-33uF-K?

The primary risk is the lower capacitance of most available alternatives (typically 22µF vs 33µF). This can affect circuit timing, stability, or filtering performance. Also, check for differences in ESR, especially when considering polymer tantalum types.

CA45-B-16V-33uF-K Alternatives, Datasheet & Cross Reference | NH

Finding a substitute for the CA45-B-16V-33uF-K tantalum capacitor requires careful review of capacitance. While several alternatives exist in the same B-case package, most offer a lower capacitance of 22µF, which must be validated for your application.

AI replacement insight

Electrical riskmedium

Lower capacitance is the primary electrical risk.

Package risklow

Several candidates match the B-Case footprint.

Can it be replaced directly?

No direct drop-in replacement was found. All form-fit compatible candidates have a lower capacitance value, requiring engineering validation.

Best replacement path

The Vishay 293D226X9016B2TE3 offers the closest parametric match, but requires accepting a 33% reduction in capacitance.

Main risk

Reduced capacitance may impact circuit performance, particularly in timing or power supply filtering applications.

Recommended alternatives

A solid tantalum capacitor in the same B-case package with matched voltage and tolerance, but lower capacitance.

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Alternative comparison matrix

Feature / factor	CA45-B-16V-33uF-K	293D226X9016B2TE3	CA45A-B-20V-22UF-K	T521B226M025ATE100	Compatibility / risk
Package	3528-21 (Case B)	3528-21 (B Case)	3528-19	3528-21 (1411 Metric)	3528-21 (B Case) / 3528-19 / 3528-21 (1411 Metric) — Same B-Case footprint.; CA45A-B-20V-22UF-K: Same footprint, lower height (1.9mm vs 2.1mm).; T521B226M025ATE100: Same B-Case footprint.
Capacitance	33µF	22µF	22µF	22µF	22µF — Candidate capacitance is 33% lower.; CA45A-B-20V-22UF-K: Candidate capacitance is 33% lower.; T521B226M025ATE100: Candidate capacitance is 33% lower.
Voltage	16V	16V	20V	25V	16V / 20V / 25V — Voltage rating matches.; CA45A-B-20V-22UF-K: Higher voltage rating is safe.; T521B226M025ATE100: Higher voltage rating is safe.
Tolerance	±10%	±10%	-	±20%	±10% / ±20% — Tolerance matches.; T521B226M025ATE100: Wider tolerance is a downgrade.
Esr	5.0Ω	1.9Ω	2.0Ω	100mΩ	1.9Ω / 2.0Ω / 100mΩ — Candidate has lower (better) ESR.; CA45A-B-20V-22UF-K: Polymer tech gives lower ESR.; T521B226M025ATE100: Polymer tech gives much lower ESR.

Application & sourcing insights

Questions & answers

The Vishay 293D226X9016B2TE3 is a strong candidate, matching the package, voltage, and tolerance. However, its capacitance is 22µF, lower than the original 33µF, requiring engineering review.