MBR1545CT Equivalent & Substitute Parts

Part Overview

The MBR1545CT is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 Pair Common Cathode with a maximum reverse voltage of 45 V and average rectified current of 15 A per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the same or compatible electrical and mechanical specifications while offering active product status and continued availability.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR1545CT is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 45 V or higher
Current - Average Rectified (Io) (per Diode): 15 A or higher
Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-3

Secondary Compatibility Factors:

Operating Temperature Range: Must support minimum -55°C to 150°C
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
RoHS Compliance: ROHS3 Compliant

Parts are grouped into three categories based on current rating and voltage specifications:

Category 1 - Direct Equivalent (45 V, 15 A): Parts with identical voltage and current ratings maintain full functional equivalence.

Category 2 - Higher Current Rating (45 V, ≥ 15 A): Parts with 45 V reverse voltage and current ratings of 20 A or 30 A provide enhanced current handling capability while maintaining voltage compatibility.

Category 3 - Higher Voltage Rating (≥ 50 V, 15 A): Parts with voltage ratings above 45 V maintain current compatibility while providing additional voltage margin.

Category 4 - Reduced Current Rating (45 V, < 15 A): Parts with lower current ratings (7.5 A, 10 A) are suitable only for applications with reduced current requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Configuration	Temp Range	Product Status
MBR1545CT	Diodes Incorporated	45 V	15 A	840 mV @ 15 A	1 Pair Common Cathode	-65°C ~ 150°C	Obsolete
MBR1545CT	Solid State Inc.	45 V	15 A	Not Specified	2 Independent	Not Specified	Active
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	570 mV @ 7.5 A	1 Pair Common Cathode	-65°C ~ 175°C	Active
SBR1545CT	SMC Diode Solutions	45 V	Not Specified	720 mV @ 7.5 A	1 Pair Common Cathode	-55°C ~ 150°C	Active
DSA20C45PB	IXYS	45 V	10 A	750 mV @ 10 A	1 Pair Common Cathode	-55°C ~ 175°C	Active
DSA30C45PB	IXYS	45 V	15 A	750 mV @ 15 A	1 Pair Common Cathode	-55°C ~ 175°C	Active
DSB60C45PB	IXYS	45 V	30 A	630 mV @ 30 A	1 Pair Common Cathode	-55°C ~ 150°C	Active
MBR2045CT-BP	Micro Commercial Co	45 V	20 A	Not Specified	1 Pair Common Cathode	-55°C ~ 150°C	Active
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	1 Pair Common Cathode	-55°C ~ 150°C	Obsolete
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	1 Pair Common Cathode	-65°C ~ 150°C	Obsolete
MBRP1545NTU	Fairchild Semiconductor	45 V	15 A	800 mV @ 15 A	1 Pair Common Cathode	-65°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

MBRP1545NTU (Fairchild Semiconductor) is the preferred direct substitute. This part maintains identical electrical specifications: 45 V reverse voltage, 15 A average rectified current per diode, 1 Pair Common Cathode configuration, and TO-220-3 package. The part is active in production status, ROHS3 compliant, and supports the same operating temperature range (-65°C ~ 150°C) as the original MBR1545CT. Forward voltage characteristics (800 mV @ 15 A) are equivalent to the original specification.

Secondary Recommendation for Enhanced Current Capability:

DSA30C45PB (IXYS) provides identical voltage and current ratings (45 V, 15 A) with active product status. This part offers extended operating temperature range (-55°C ~ 175°C) and improved forward voltage characteristics (750 mV @ 15 A). The part is ROHS3 compliant and REACH unaffected.

Alternative for Higher Current Applications:

DSB60C45PB (IXYS) and MBR2045CT-BP (Micro Commercial Co) are suitable for applications requiring current capacity beyond 15 A. DSB60C45PB provides 30 A capability with superior forward voltage (630 mV @ 30 A), while MBR2045CT-BP offers 20 A capability. Both maintain 45 V reverse voltage and active product status.

Not Recommended:

MBR2550CT (Diodes Incorporated) is obsolete and should not be selected for new designs despite higher voltage rating. MBR20L45CTG (onsemi) is also obsolete. MBR1545CT-E3/45 (Vishay) has reduced current rating (7.5 A) and is suitable only for applications with lower current requirements.

Frequently Asked Questions (FAQ)

Q: Can MBR1545CT-E3/45 be used as a direct replacement for MBR1545CT?

A: No. While both parts share the same 45 V reverse voltage and 1 Pair Common Cathode configuration, MBR1545CT-E3/45 has a maximum average rectified current of 7.5 A per diode, compared to 15 A for the original MBR1545CT. This part is suitable only for applications with reduced current requirements.

Q: What is the difference between MBR1545CT from Diodes Incorporated and MBR1545CT from Solid State Inc.?

A: Both parts have identical part numbers but differ in diode configuration. The Diodes Incorporated version uses 1 Pair Common Cathode configuration, while the Solid State Inc. version uses 2 Independent configuration. These are not interchangeable due to different internal pin connections.

Q: Is MBR2550CT a suitable substitute for MBR1545CT?

A: MBR2550CT has a higher reverse voltage rating (50 V versus 45 V) and identical current rating (15 A). However, MBR2550CT is obsolete and should not be selected for new designs. Active alternatives with equivalent or superior specifications are available.

Q: Can DSB60C45PB replace MBR1545CT in all applications?

A: DSB60C45PB maintains the same 45 V reverse voltage and 1 Pair Common Cathode configuration but provides 30 A current capability compared to 15 A. This part is suitable for direct replacement and offers enhanced current handling. The lower forward voltage (630 mV @ 30 A) may result in reduced power dissipation in high-current applications.

Q: What are the key parameters that determine substitutability?

A: The critical parameters are: Voltage - DC Reverse (Vr) (Max) of 45 V or higher, Current - Average Rectified (Io) (per Diode) of 15 A or higher, Diode Configuration of 1 Pair Common Cathode, Technology of Schottky, Mounting Type of Through Hole, and Package of TO-220-3. Operating temperature range and RoHS compliance are secondary factors.

Q: Why is product status important when selecting a substitute?

A: Obsolete parts have limited availability and no guaranteed future supply. Active products ensure continued manufacturing and availability for production requirements. For new designs, active parts are mandatory to avoid supply chain disruption.

Q: Are there differences in RoHS compliance between substitute options?

A: Most substitute parts are ROHS3 compliant. REACH status varies: some parts are REACH Unaffected, while others are REACH Affected. For applications requiring specific regulatory compliance, verify REACH status with the selected manufacturer.

Q: Can MBR1545CT be used in applications requiring higher voltage tolerance?

A: MBR1545CT is rated for 45 V maximum reverse voltage. For applications requiring higher voltage tolerance, MBR2550CT (50 V) is available, though it is obsolete. For new designs, consider active alternatives with higher voltage ratings if application requirements exceed 45 V.

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