Is there a pin-compatible replacement for CA45A-B-16V-47UF-K?

No pin-compatible replacement with matching or better performance was found. CA45-B-16V-47uF-M fits the same footprint but has significantly worse ESR and tolerance.

What risks should I check before replacing CA45A-B-16V-47UF-K?

Key risks are package mismatch requiring a new PCB layout, increased ESR which can affect circuit stability, and technology differences (e.g., MLCC DC-bias effect).

CA45A-B-16V-47UF-K Alternatives, Datasheet & Cross Reference | NH

Find substitutes for the CA45A-B-16V-47UF-K, a 47µF 16V Tantalum Polymer capacitor in a B-case. Alternatives may require PCB layout changes or have different electrical characteristics like ESR.

AI replacement insight

Package riskhigh

Most viable alternatives are in different packages (e.g., Case D), requiring a PCB respin.

Electrical riskmedium

A same-package option has much higher ESR. Other technologies (MLCC, Al-Poly) have different performance characteristics.

Can it be replaced directly?

No direct pin-for-pin replacement with equal or better performance was found. A same-package option exists but is an electrical downgrade (higher ESR, wider tolerance).

Best replacement path

Functional alternates with superior electricals exist, but in different packages (e.g., Case D), requiring a PCB layout change.

Main risk

Package mismatch is the primary risk, requiring PCB redesign. Electrical risks include higher ESR or different capacitor technology.

Recommended alternatives

Electrically superior alternative with higher voltage and lower ESR, but in a larger package.

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Alternative comparison matrix

Feature / factor	CA45A-B-16V-47UF-K	CA45B-D-25V-47UF-K	CA45-D-16V-47uF-K	CA45-B-16V-47uF-M	Compatibility / risk
Package	B (3528)	D (7343-28)	D	B	D (7343-28) / B — Larger footprint requires PCB layout change.; CA45-D-16V-47uF-K: Larger footprint requires PCB layout change.; CA45-B-16V-47uF-M: Same EIA case code.
Voltage	16V	25V	16V	-	25V / 16V — Higher voltage rating provides more margin.; CA45-D-16V-47uF-K: Matches target voltage.
Esr	0.8 Ω	≤0.3 Ω	0.9 Ω	3 Ω (Max)	≤0.3 Ω / 0.9 Ω / 3 Ω (Max) — Lower ESR is a significant performance upgrade.; CA45-D-16V-47uF-K: Slightly higher but comparable ESR.; CA45-B-16V-47uF-M: Significantly higher ESR, impacts ripple and efficiency.
Tolerance	±10%	±10%	-	±20%	±10% / ±20% — Matches target tolerance.; CA45-B-16V-47uF-M: Wider tolerance may affect circuit precision.
Technology	Tantalum Polymer	-	Tantalum Polymer	Std Tantalum	Tantalum Polymer / Std Tantalum — Matches target technology.; CA45-B-16V-47uF-M: Target is Tantalum Polymer, affects ESR and ripple current.

Application & sourcing insights

Questions & answers

CA45B-D-25V-47UF-K offers upgraded voltage and lower ESR but requires a PCB layout change from Case B to Case D.