Is there a pin-compatible replacement for CY43-3.3UH?

No direct pin-to-pin replacement has been verified. The closest candidate, NRS4018T3R3MDGJ, has a similar footprint but requires layout verification. Other alternatives will require a board redesign.

What risks should I check before replacing CY43-3.3UH?

Key risks include: 1) Package Mismatch: Ensure the replacement's footprint and height fit your PCB layout. 2) Electrical Specs: Higher DCR increases power loss, and lower current ratings can cause failure. 3) Temperature Range: Verify the replacement's operating temperature meets your application's requirements.

CY43-3.3UH Alternatives, Datasheet & Cross Reference | Shenzhen Hanxia Electronics Co., LTD

The CY43-3.3UH is a 3.3µH shielded power inductor in a 4.5x4.0mm package, commonly used in DC-DC converters. Finding a replacement involves matching inductance, current rating, DCR, and physical footprint.

AI replacement insight

Package riskhigh

Most alternatives have a different footprint, requiring board redesign.

Electrical riskmedium

Candidates vary in DCR and temperature range, impacting efficiency and reliability.

Sourcing risklow

3.3µH inductors are widely available from multiple vendors.

Can it be replaced directly?

There is no confirmed direct drop-in replacement for the CY43-3.3UH. All viable alternatives require some level of design verification, particularly for the PCB footprint.

Best replacement path

Evaluate NRS4018T3R3MDGJ for applications where a minor layout adjustment is possible. For performance-critical redesigns, PSPMAA1040H-3R3M-ANP offers a significant upgrade if space allows.

Main risk

The primary risk is mechanical incompatibility. Most alternatives have different package sizes, requiring PCB layout changes. The second risk is increased power loss from candidates with higher DCR.

Recommended alternatives

A strong functional alternative with a similar footprint and slightly higher current rating, but requires layout and temperature range verification.

View details

Alternative comparison matrix

Feature / factor	CY43-3.3UH	NRS4018T3R3MDGJ	PSPMAA1040H-3R3M-ANP	Compatibility / risk
Package	4.5x4.0x3.2mm	4.0x4.0x1.8mm	10.2x11.0x4.0mm	4.0x4.0x1.8mm / 10.2x11.0x4.0mm — Similar size, verify footprint.; PSPMAA1040H-3R3M-ANP: Significantly larger, requires board redesign.
Current	2.1A	2.3A	10.0A	2.3A / 10.0A — Slightly higher saturation current.; PSPMAA1040H-3R3M-ANP: Much higher current rating.
Dcr Ohm	0.051Ω	0.055Ω	0.012Ω	0.055Ω / 0.012Ω — Slightly higher DCR, minor efficiency loss.; PSPMAA1040H-3R3M-ANP: Much lower DCR, higher efficiency.
Temperature	-55°C to +125°C	-25°C to +125°C	-	-25°C to +125°C — Narrower operating range at low end.

Application & sourcing insights

Questions & answers

NRS4018T3R3MDGJ by TAIYO YUDEN is a strong functional alternative. It offers similar electrical performance in a comparable 4.0x4.0mm package, but requires verification of the PCB footprint and operating temperature range.