MBR3045CT-LJ Equivalent & Substitute Parts

Part Overview

The MBR3045CT-LJ is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

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	620 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the MBR3045CT-LJ is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitutes may vary within the range of 590 mV to 750 mV @ 15 A
Current - Reverse Leakage @ Vr: Substitutes may range from 1 µA to 300 µA @ 45 V
Operating Temperature - Junction: Substitutes may extend to -65°C ~ 175°C
Product Status: Active substitutes are preferred over obsolete alternatives

Substitute parts meeting all critical matching parameters and operating within acceptable variation ranges are listed below. Parts with lower current ratings (10 A) or higher current ratings (30 A) are grouped separately as they do not meet the 15 A requirement and are suitable only for applications with different current specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status
MBR3045CT-LJ	Diodes Incorporated	45 V	15 A	620 mV @ 15 A	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Obsolete
DSA30C45PB	IXYS	45 V	15 A	750 mV @ 15 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSB30C45PB	IXYS	45 V	15 A	590 mV @ 15 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK28-0045A	IXYS	45 V	15 A	670 mV @ 15 A	500 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
MBRP3045NTU	Fairchild Semiconductor	45 V	15 A	650 mV @ 15 A	1 mA @ 45 V	-65°C ~ 150°C	TO-220-3	Active

Engineering Selection Recommendations

Primary Substitutes (15 A Rating - Direct Equivalents):

The following parts are direct electrical and mechanical equivalents to the MBR3045CT-LJ and are recommended as primary substitutes:

DSA30C45PB (IXYS) - Active product status. Meets all critical parameters. Extended operating temperature range to 175°C. Forward voltage specification of 750 mV @ 15 A is within acceptable variation.
DSB30C45PB (IXYS) - Active product status. Meets all critical parameters. Forward voltage specification of 590 mV @ 15 A matches the original part closely. Operating temperature range matches the original specification.
DSSK28-0045A (IXYS) - Active product status. Meets all critical parameters. Extended operating temperature range to 175°C. Forward voltage specification of 670 mV @ 15 A is within acceptable variation.
MBRP3045NTU (Fairchild Semiconductor) - Active product status. Meets all critical parameters. Extended operating temperature range to -65°C ~ 150°C. Forward voltage specification of 650 mV @ 15 A is within acceptable variation. Lowest reverse leakage at 1 mA @ 45 V.

Secondary Substitutes (Alternative Current Ratings):

The following parts share the same voltage rating, package, and configuration but with different current ratings. These are suitable only for applications where the current requirement differs from 15 A:

DSA20C45PB (IXYS) - 10 A rating. Active product status. For applications requiring 10 A or less.
DSA60C45PB (IXYS) - 30 A rating. Active product status. For applications requiring 30 A or higher.
DSB60C45PB (IXYS) - 30 A rating. Active product status. For applications requiring 30 A or higher.
DSSK20-0045A (IXYS) - 10 A rating. Active product status. For applications requiring 10 A or less.
DST2045C (Littelfuse Inc.) - 10 A rating. Active product status. For applications requiring 10 A or less.
MBR20L45CTG (onsemi) - 10 A rating. Obsolete product status. For applications requiring 10 A or less.

Frequently Asked Questions (FAQ)

Q: Can DSA30C45PB be used as a direct replacement for MBR3045CT-LJ?

A: Yes. DSA30C45PB meets all critical electrical and mechanical parameters: 45 V reverse voltage, 15 A average rectified current per diode, 1 pair common cathode configuration, Schottky technology, and TO-220-3 through-hole package. The forward voltage specification of 750 mV @ 15 A is within acceptable variation from the original 620 mV @ 15 A. DSA30C45PB is an active product from IXYS.

Q: What is the difference between DSA30C45PB and DSB30C45PB?

A: Both parts meet the 15 A current requirement and 45 V voltage rating in TO-220-3 package. The primary differences are: DSA30C45PB has forward voltage of 750 mV @ 15 A and reverse leakage of 300 µA @ 45 V; DSB30C45PB has forward voltage of 590 mV @ 15 A and reverse leakage of 10 mA @ 45 V. DSB30C45PB forward voltage specification is closer to the original MBR3045CT-LJ at 620 mV @ 15 A.

Q: Why are DSA20C45PB and DSA60C45PB listed as substitutes if they have different current ratings?

A: DSA20C45PB (10 A) and DSA60C45PB (30 A) are not direct equivalents to the MBR3045CT-LJ (15 A). They are listed as alternative options only for applications where the current requirement differs from 15 A. For the original 15 A specification, use parts with 15 A rating only.

Q: Is MBRP3045NTU suitable for automotive applications?

A: MBRP3045NTU is an active product from Fairchild Semiconductor that meets all critical parameters for the MBR3045CT-LJ. However, the original MBR3045CT-LJ carries automotive grade classification and AEC-Q101 qualification. MBRP3045NTU specifications do not explicitly state automotive grade or AEC-Q101 qualification in the provided data. Verify automotive compliance requirements with the manufacturer before selection for automotive applications.

Q: What is the operating temperature range difference between substitutes?

A: The original MBR3045CT-LJ operates from -55°C to 150°C. Several substitutes extend the upper temperature limit to 175°C (DSA30C45PB, DSSK28-0045A). MBRP3045NTU extends the lower temperature limit to -65°C. Extended temperature ranges provide additional design margin but do not affect compatibility in applications operating within the original -55°C to 150°C range.

Q: Can I use MBR20L45CTG as a substitute?

A: MBR20L45CTG has a 10 A current rating, not 15 A. It is not a direct equivalent to MBR3045CT-LJ. Additionally, MBR20L45CTG is classified as obsolete. Use only if your application requires 10 A or less and no active 15 A alternatives are available.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in the parameter comparison table are RoHS3 compliant, matching the compliance status of the original MBR3045CT-LJ.

Q: What is the significance of the TO-220-3 package specification?

A: TO-220-3 is the through-hole package format with three leads. All listed substitutes use the same TO-220-3 package, ensuring mechanical and electrical compatibility with existing PCB layouts and thermal management designs. Package compatibility is a critical substitution criterion.

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