Is there a pin-compatible replacement for MBR2045CS?

Yes, parts like MBRD20100CT share the same TO-252 package and common cathode pinout. However, electrical parameters like forward voltage differ, so they are not drop-in replacements without engineering review.

What risks should I check before replacing MBR2045CS?

The main risk is electrical. Verify the candidate's forward voltage (Vf) to ensure power dissipation and temperature rise are acceptable in your application. Also confirm V/I ratings are sufficient.

MBR2045CS Alternatives, Datasheet & Cross Reference | KEXIN

MBR2045CS is a 45V, 20A dual common cathode Schottky rectifier in a TO-252 package. Key factors for a replacement are matching the common cathode pinout and package, while carefully reviewing the forward voltage (Vf) to manage thermal performance.

AI replacement insight

Electrical riskmedium

Higher forward voltage requires thermal re-evaluation.

Package risklow

TO-252 package is a common and direct match.

Can it be replaced directly?

No direct drop-in replacement is confirmed. Alternatives like MBRD20100CT are functionally similar but have a higher forward voltage, requiring review.

Best replacement path

Use a higher-voltage (>=100V) 20A common-cathode Schottky diode in a TO-252 package, but validate thermal performance due to higher forward voltage.

Main risk

Increased power dissipation and heat due to higher forward voltage (Vf) in available alternatives.

Recommended alternatives

A functional alternative in the same package with a higher voltage rating (100V), but review the increased forward voltage.

View details

Alternative comparison matrix

Feature / factor	MBR2045CS	MBRD20100CT	MBRD20200	Compatibility / risk
Package	TO-252	TO-252	TO-252	TO-252 — Package is physically compatible.; MBRD20200: Package is physically compatible.
Pinout	Dual Common Cathode	Common Cathode	Common Cathode	Common Cathode — Functionally identical dual common cathode configuration.; MBRD20200: Functionally identical dual common cathode configuration.
Voltage	45V	100V	200V	100V / 200V — Higher voltage rating provides more design margin.; MBRD20200: Higher voltage rating provides more design margin.
Current	20A	20A	20A	20A — Current rating matches the target.; MBRD20200: Current rating matches the target.
Forward Voltage	0.6V @ 10A	0.85V	0.90V @ 20A	0.85V / 0.90V @ 20A — Higher Vf will increase power loss; thermal analysis recommended.; MBRD20200: Higher Vf will increase power loss; thermal analysis recommended.

Application & sourcing insights

Questions & answers

MBRD20100CT and MBRD20200 are strong functional alternatives. They offer higher voltage ratings in the same package but have a higher forward voltage, which requires thermal analysis.