What is the best alternative to 149EC921?

The best alternative would be another polymer or hybrid capacitor with similar low ESR ( 1300mA), and an 8mm diameter package. No exact match is currently listed; review application needs carefully.

Is there a pin-compatible replacement for 149EC921?

Potentially. Parts like the Lelon VZH101M1HTR-0810L have a compatible PCB footprint but are slightly taller and have significantly worse electrical performance (ESR, ripple current), making them a high-risk, non-direct replacement.

What risks should I check before replacing 149EC921?

Key risks are electrical and thermal. Ensure the replacement's ESR and ripple current ratings meet your circuit's minimum requirements to prevent overheating and failure. Also, verify the physical height fits within your design.

149EC921 Alternatives, Datasheet & Cross Reference | KNSCHA

Finding a replacement for the KNSCHA 149EC921, a 100uF 50V polymer capacitor, requires careful matching of its low ESR (60mΩ) and high ripple current (1320mA). Alternatives exist but may have different electrical characteristics.

AI replacement insight

Electrical riskhigh

Target has very low ESR and high ripple current; most standard electrolytics are a significant downgrade.

Package riskmedium

Footprint (8mm diameter) is common, but height and pad layout must be verified. Some alternatives are taller.

Can it be replaced directly?

No direct drop-in replacement has been identified. Candidates with compatible footprints have much higher ESR and lower ripple current, posing a high risk.

Best replacement path

Search for polymer or hybrid aluminum capacitors with 8mm diameter, ESR under 80mΩ, and ripple current over 1300mA.

Main risk

The primary risk is substituting with a capacitor that has higher ESR and lower ripple current, which can lead to overheating and premature failure.

Recommended alternatives

Footprint compatible but electrically a major downgrade (higher ESR, lower ripple current).

View details

Alternative comparison matrix

Feature / factor	149EC921	VZH101M1HTR-0810	VZH101M1HTR-0810L	Compatibility / risk
Package	8mm x 9mm	8mm x 10mm	8mm x 10mm	8mm x 10mm — Footprint compatible, but 1mm taller. Verify vertical clearance.; VZH101M1HTR-0810L: Footprint compatible, but 1mm taller. Verify vertical clearance.
Voltage	50V	50V	50V	50V — matched; VZH101M1HTR-0810L: matched
Esr	60 mΩ	180 mΩ	180 mΩ	180 mΩ — Significantly higher ESR, may cause overheating or circuit malfunction. Value inferred from series datasheet.; VZH101M1HTR-0810L: Significantly higher ESR, may cause overheating or circuit malfunction.
Ripple Current	1320 mA	553 mA	553 mA	553 mA — Much lower rating poses a high risk of component failure. Value inferred from series datasheet.; VZH101M1HTR-0810L: Much lower rating poses a high risk of component failure.
Load Life	2000 hrs	5000 hrs	5000 hrs	5000 hrs — Longer life is an upgrade.; VZH101M1HTR-0810L: Longer life is an upgrade.

Application & sourcing insights

Questions & answers

The best alternative would be another polymer or hybrid capacitor with similar low ESR (<80mΩ), high ripple current (>1300mA), and an 8mm diameter package. No exact match is currently listed; review application needs carefully.