MBR3045CTP Equivalent & Substitute Parts

Part Overview

The MBR3045CTP is a Schottky diode array manufactured by Diodes Incorporated, configured as a 1 Pair Common Cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in a TO-220-3 Isolated Tab through-hole configuration. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	MBR3045CTP
Manufacturer	Diodes Incorporated
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	650 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
Operating Temperature - Junction	-65°C ~ 150°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR3045CTP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 15 A minimum
Mounting Type: Through Hole
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Package / Case: TO-220-3 variants (Isolated Tab or Full Pack acceptable)
RoHS Status: ROHS3 Compliant
Operating Temperature Range: -65°C minimum to 150°C minimum

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (45 V, 15 A): Parts meeting all primary substitution criteria with identical voltage and current ratings.

Category B - Functional Alternatives (45 V, ≥12.5 A or 40 V, 15 A): Parts with minor deviations in current rating or voltage rating that maintain functional compatibility within specified operating parameters.

Parameter Comparison

Parameter	MBR3045CTP	VFT3045CBP-M3/4W	MBRF30H45CT-E3/45	STPS30L45CFP	MBRF2545CTG	MBRF2045CT	RB225T-40
Manufacturer	Diodes Inc.	Vishay	Vishay	STMicroelectronics	onsemi	Diodes Inc.	Rohm
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	60 V	40 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	15 A	15 A	12.5 A	10 A	15 A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 15 A	570 mV @ 15 A	620 mV @ 15 A	550 mV @ 15 A	700 mV @ 12.5 A	640 mV @ 10 A	630 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V	2 mA @ 45 V	80 µA @ 45 V	400 µA @ 45 V	200 µA @ 45 V	100 µA @ 60 V	500 µA @ 40 V
Operating Temperature - Junction	-65°C ~ 150°C	200°C (Max)	-65°C ~ 175°C	150°C (Max)	-65°C ~ 175°C	-55°C ~ 150°C	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack	TO-220-3 Full Pack	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack
Product Status	Obsolete	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Category A - Direct Electrical Equivalents (Recommended Primary Substitutes):

MBRF30H45CT-E3/45 (Vishay General Semiconductor - Diodes Division)

Meets all primary substitution criteria: 45 V, 15 A, 1 Pair Common Cathode, Schottky, Fast Recovery
Active product status ensures long-term availability
ROHS3 Compliant and REACH Unaffected
Operating temperature range: -65°C ~ 175°C (exceeds MBR3045CTP minimum requirements)
Forward voltage: 620 mV @ 15 A (lower than MBR3045CTP at 650 mV)
Reverse leakage: 80 µA @ 45 V (lower than MBR3045CTP at 200 µA)
Package: TO-220-3 Full Pack, Isolated Tab (compatible with original)

STPS30L45CFP (STMicroelectronics)

Meets all primary substitution criteria: 45 V, 15 A, 1 Pair Common Cathode, Schottky, Fast Recovery
Active product status ensures long-term availability
ROHS3 Compliant and REACH Unaffected
Forward voltage: 550 mV @ 15 A (superior performance vs. MBR3045CTP)
Operating temperature range: 150°C (Max) (meets minimum requirement)
Package: TO-220-3 Full Pack (compatible with original)

VFT3045CBP-M3/4W (Vishay General Semiconductor - Diodes Division)

Meets all primary substitution criteria: 45 V, 15 A, 1 Pair Common Cathode, Schottky, Fast Recovery
Active product status ensures long-term availability
ROHS3 Compliant and REACH Unaffected
Operating temperature range: 200°C (Max) (exceeds MBR3045CTP minimum requirements)
Forward voltage: 570 mV @ 15 A (lower than MBR3045CTP)
Package: TO-220-3 Full Pack, Isolated Tab (compatible with original)

Category B - Functional Alternatives (Secondary Substitutes):

MBRF2545CTG (onsemi)

Meets primary substitution criteria with minor current deviation: 45 V, 12.5 A (vs. 15 A), 1 Pair Common Cathode, Schottky, Fast Recovery
Active product status ensures long-term availability
ROHS3 Compliant and REACH Unaffected
Operating temperature range: -65°C ~ 175°C (exceeds MBR3045CTP minimum requirements)
Forward voltage: 700 mV @ 12.5 A (higher than MBR3045CTP)
Suitable for applications where 12.5 A current rating is acceptable

RB225T-40 (Rohm Semiconductor)

Meets primary substitution criteria with minor voltage deviation: 40 V (vs. 45 V), 15 A, 1 Pair Common Cathode, Schottky, Fast Recovery
Active product status ensures long-term availability
ROHS3 Compliant and REACH Unaffected
Forward voltage: 630 mV @ 15 A (comparable to MBR3045CTP)
Suitable for applications where 40 V reverse voltage rating is acceptable

MBRF2045CT (Diodes Incorporated)

Meets primary substitution criteria with deviations: 60 V (vs. 45 V), 10 A (vs. 15 A), 1 Pair Common Cathode, Schottky, Fast Recovery
Obsolete product status (same as MBR3045CTP)
ROHS3 Compliant and REACH Affected
Automotive Grade with AEC-Q101 Qualification
Not recommended for new designs due to obsolete status

Frequently Asked Questions (FAQ)

Q: Can MBRF30H45CT-E3/45 directly replace MBR3045CTP without circuit modifications?

A: Yes. MBRF30H45CT-E3/45 is a direct electrical equivalent with identical voltage (45 V) and current (15 A) ratings, same diode configuration (1 Pair Common Cathode), and compatible TO-220-3 package. The lower forward voltage (620 mV vs. 650 mV) and reverse leakage (80 µA vs. 200 µA) represent improved performance characteristics. No circuit modifications are required.

Q: What is the difference between TO-220-3 Isolated Tab and TO-220-3 Full Pack packages?

A: Both are through-hole TO-220-3 packages suitable for the same PCB footprints. The Isolated Tab variant provides electrical isolation between the tab and the case, while the Full Pack variant does not. For applications requiring tab isolation, verify the original design specification. Both variants are mechanically and electrically compatible with standard TO-220-3 mounting.

Q: Why is STPS30L45CFP listed as a substitute if it has a lower maximum junction temperature (150°C vs. 175°C)?

A: STPS30L45CFP meets all primary substitution criteria and maintains the 150°C maximum junction temperature requirement specified in the MBR3045CTP datasheet. The comparison table shows maximum operating temperatures; STPS30L45CFP's 150°C maximum is sufficient for the original part's -65°C ~ 150°C operating range. The lower forward voltage (550 mV) provides superior thermal performance in practical applications.

Q: Can MBRF2545CTG be used in applications requiring 15 A continuous current?

A: MBRF2545CTG is rated for 12.5 A average rectified current per diode, which is lower than the MBR3045CTP's 15 A rating. This part is suitable only for applications where the actual operating current does not exceed 12.5 A. For designs requiring the full 15 A capability, use Category A substitutes (MBRF30H45CT-E3/45, STPS30L45CFP, or VFT3045CBP-M3/4W).

Q: Is RB225T-40 suitable for circuits designed for 45 V operation?

A: RB225T-40 has a 40 V reverse voltage rating compared to the MBR3045CTP's 45 V rating. This part is suitable only for applications where the actual reverse voltage does not exceed 40 V. For circuits requiring the full 45 V capability, use Category A substitutes with 45 V ratings.

Q: What compliance certifications should I verify when selecting a substitute?

A: All listed substitutes are ROHS3 Compliant. Verify REACH status based on your supply chain requirements: REACH Unaffected parts (MBRF30H45CT-E3/45, STPS30L45CFP, VFT3045CBP-M3/4W, MBRF2545CTG, RB225T-40) are preferred for unrestricted global distribution. MBRF2045CT is REACH Affected and should be avoided for new designs.

Q: Are there automotive-grade alternatives available?

A: MBRF2045CT carries Automotive Grade designation with AEC-Q101 Qualification; however, this part is obsolete and has deviations in voltage (60 V) and current (10 A) ratings. For automotive applications requiring 45 V, 15 A specifications, use active Category A substitutes and verify automotive qualification requirements with the component manufacturer.

Q: What is the significance of reverse leakage current differences among substitutes?

A: Reverse leakage current affects thermal performance and power dissipation in standby conditions. Lower reverse leakage (MBRF30H45CT-E3/45 at 80 µA) results in reduced power loss compared to higher leakage (STPS30L45CFP at 400 µA). For applications with stringent power budget requirements, select substitutes with lower reverse leakage specifications.

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