MBRF3045CT-LJ Equivalent & Substitute Parts

Part Overview

The MBRF3045CT-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 with isolated tab and features fast recovery characteristics suitable for automotive applications with AEC-Q101 qualification.

The MBRF3045CT-LJ is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production and field service applications. Active alternatives with equivalent or superior electrical characteristics are available from multiple manufacturers.

Substiute Parts

MBRF3045CT-LJ

Diodes IncorporatedIn Stock: 23221MBRF3045CT-LJ Datasheet

Current PartRFQ

DSTF2045C

Littelfuse Inc.In Stock: 816DSTF2045C Datasheet

MFR RecommendedRFQ

DSTF2050C

Littelfuse Inc.In Stock: 964DSTF2050C Datasheet

MFR RecommendedRFQ

DSTF3045C

Littelfuse Inc.In Stock: 1137DSTF3045C Datasheet

MFR RecommendedRFQ

DSTF4045C

Littelfuse Inc.In Stock: 1054DSTF4045C Datasheet

MFR RecommendedRFQ

DSTF4050C

Littelfuse Inc.In Stock: 1048DSTF4050C Datasheet

MFR RecommendedRFQ

MBRF30H45CT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 4226MBRF30H45CT-E3/45 Datasheet

Parametric EquivalentRFQ

MBRF30H45CTHE3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 795MBRF30H45CTHE3/45 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBRF3045CT-LJ is determined by the following critical parameters:

Mandatory Matching Parameters:

• 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
• Package / Case: TO-220-3 Full Pack, Isolated Tab
• Supplier Device Package: ITO-220AB

Allowable Variation Parameters:

• Voltage - Forward (Vf): May vary within acceptable design margins
• Current - Reverse Leakage: Lower values are acceptable
• Operating Temperature - Junction: Extended ranges are acceptable
• Speed: Fast Recovery characteristic must be maintained

Substitute parts are grouped into two categories:

Category 1: Manufacturer Recommended Substitutes (MFR Recommended) Parts meeting or exceeding all mandatory parameters with active product status. These include DSTF2045C, DSTF2050C, DSTF3045C, DSTF4045C, and DSTF4050C from Littelfuse Inc.

Category 2: Parametric Equivalents Parts with identical electrical specifications and automotive qualification. These include MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45 from Vishay General Semiconductor - Diodes Division.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent (Preferred for Automotive Applications):

MBRF30H45CTHE3/45 from Vishay General Semiconductor - Diodes Division is the direct parametric equivalent with identical electrical specifications, automotive grade designation, and AEC-Q101 qualification. This part maintains full compatibility with the original MBRF3045CT-LJ design and is currently in active production status with 734 units in stock.

Alternative: MBRF30H45CT-E3/45

MBRF30H45CT-E3/45 from Vishay General Semiconductor - Diodes Division provides identical electrical performance and extended operating temperature range (-65°C ~ 175°C versus -55°C ~ 150°C). This part is active with 4200 units in stock. Note: This variant does not carry automotive grade or AEC-Q101 designation.

Manufacturer Recommended Substitutes (Littelfuse DSTF Series):

DSTF3045C from Littelfuse Inc. matches the MBRF3045CT-LJ in voltage rating (45 V), current rating (15 A), and package configuration. This part is active with 1104 units in stock. Forward voltage is lower (570 mV @ 15 A versus 620 mV @ 15 A), resulting in reduced power dissipation. Reverse leakage is higher (2 mA @ 45 V versus 100 µA @ 45 V).

Current Derating Alternatives:

DSTF2045C (10 A rating) and DSTF2050C (10 A rating, 50 V) are suitable only for applications where the 15 A current requirement can be reduced or where thermal management permits operation at reduced current levels.

DSTF4045C (20 A rating) and DSTF4050C (20 A rating, 50 V) provide current margin above the 15 A requirement and are suitable for applications requiring enhanced current capacity or thermal headroom.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and are packaged in the identical ITO-220AB configuration. The MBRF30H45CTHE3/45 is the only substitute carrying automotive grade and AEC-Q101 qualification, matching the original part's qualification status.

Frequently Asked Questions (FAQ)

Q: Can DSTF3045C be used as a direct replacement for MBRF3045CT-LJ?

A: DSTF3045C is electrically compatible as a substitute. It matches the 45 V reverse voltage, 15 A current rating, and TO-220-3 package. However, it differs in forward voltage (570 mV versus 620 mV) and reverse leakage (2 mA versus 100 µA). These differences are acceptable in most applications but must be evaluated against specific circuit requirements.

Q: What is the difference between MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45?

A: Both parts have identical electrical specifications and are from Vishay. The primary difference is that MBRF30H45CTHE3/45 carries automotive grade designation and AEC-Q101 qualification, while MBRF30H45CT-E3/45 does not. For automotive applications, MBRF30H45CTHE3/45 is the appropriate selection.

Q: Can I use DSTF2045C or DSTF2050C if my application only requires 10 A?

A: Yes, if your circuit design operates at 10 A or below, DSTF2045C (45 V, 10 A) or DSTF2050C (50 V, 10 A) are suitable substitutes. These parts are active and in stock. However, if your design requires the full 15 A capability, these lower-rated parts are not appropriate.

Q: Are all substitute parts in the same package?

A: Yes, all substitute parts listed are packaged in TO-220-3 Full Pack with isolated tab (ITO-220AB). Direct mechanical and thermal interface compatibility is maintained across all alternatives.

Q: Which substitute part has the lowest forward voltage drop?

A: DSTF2050C has the lowest forward voltage at 550 mV @ 10 A. However, this part is rated for 10 A, not 15 A. Among 15 A rated parts, DSTF3045C has the lowest forward voltage at 570 mV @ 15 A.

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

A: The MBRF3045CT-LJ has reverse leakage of 100 µA @ 45 V. Littelfuse DSTF series parts have higher leakage (1–3 mA range), while Vishay MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45 have lower leakage (80 µA @ 45 V). Higher leakage increases standby power consumption; lower leakage reduces it. Selection depends on circuit power budget requirements.

Q: Can I use a 50 V rated part in place of a 45 V rated part?

A: Yes, a higher voltage rating is acceptable for substitution. DSTF2050C (50 V) and DSTF4050C (50 V) can replace 45 V rated parts. The higher voltage rating provides additional safety margin against overvoltage transients.

Q: Is the MBRF3045CT-LJ still available?

A: The MBRF3045CT-LJ is classified as obsolete. However, 23,200 units are currently in stock. For new designs and long-term availability, active alternatives such as MBRF30H45CTHE3/45 or DSTF3045C are recommended.

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

A: The original MBRF3045CT-LJ operates from -55°C to 150°C. Vishay MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45 extend this to -65°C to 175°C, providing wider temperature margin. Littelfuse DSTF series parts maintain the -55°C to 150°C range.