VT1045BP-M3/4W Equivalent & Substitute Parts

Part Overview

The VT1045BP-M3/4W is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 10 A average rectified current in a Through Hole TO-220AC package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the allowed parameter ranges.

Substiute Parts

VT1045BP-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 873VT1045BP-M3/4W Datasheet

Current PartRFQ

STPS1045D

STMicroelectronicsIn Stock: 55269STPS1045D Datasheet

DirectRFQ

STPS745D

STMicroelectronicsIn Stock: 17035STPS745D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VT1045BP-M3/4W are determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V
• Mounting Type: Through Hole
• Package / Case: TO-220-2
• Technology: Schottky
• RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

• Current - Average Rectified (Io): Equal or greater rating
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Supplier Device Package: TO-220AC

Substitutes are grouped into two categories based on current rating alignment:

Group 1 - Direct Current Rating Match (10 A): Parts with identical 10 A average rectified current rating provide direct functional equivalence.

Group 2 - Reduced Current Rating (7.5 A): Parts with lower current ratings are suitable only for applications where the actual operating current does not exceed the substitute part's rating.

Parameter Comparison

Engineering Selection Recommendations

STPS1045D (STMicroelectronics): This substitute provides direct electrical and mechanical equivalence to the VT1045BP-M3/4W. Both parts share identical voltage and current ratings, matching TO-220-2 package specifications, and are ROHS3 compliant. The STPS1045D exhibits lower forward voltage drop (600 mV vs. 680 mV @ 10 A) and reduced reverse leakage current (100 µA vs. 500 µA @ 45 V). The operating temperature maximum is 175°C compared to 200°C for the original part. Selection of STPS1045D is appropriate where the lower junction temperature rating does not constrain thermal design margins.

STPS745D (STMicroelectronics): This substitute is rated for 7.5 A average rectified current, which is 25% lower than the VT1045BP-M3/4W. The STPS745D maintains the same 45 V reverse voltage rating, TO-220-2 package, and ROHS3 compliance. Forward voltage is specified at 840 mV @ 15 A, and reverse leakage is 100 µA @ 45 V. Selection of STPS745D is restricted to applications where the maximum operating current does not exceed 7.5 A. The reduced current rating must be verified against circuit requirements before implementation.

Both substitutes maintain Active product status and are available in production quantities.

Frequently Asked Questions (FAQ)

Q1: Can STPS1045D be used as a direct replacement for VT1045BP-M3/4W?

A: Yes. The STPS1045D provides direct substitution based on matching voltage rating (45 V), current rating (10 A), package type (TO-220-2), and technology (Schottky). Both parts are ROHS3 compliant and Active status. The lower forward voltage drop and reverse leakage of the STPS1045D represent improved electrical performance. Verify that the 175°C maximum junction temperature does not exceed thermal design requirements.

Q2: Under what conditions is STPS745D suitable as a substitute?

A: The STPS745D is suitable only when the application's maximum operating current does not exceed 7.5 A. The 45 V reverse voltage rating and TO-220-2 package remain compatible. The reduced current rating represents a 25% derating from the original 10 A specification. Circuit analysis must confirm that peak and average rectified currents remain within the 7.5 A limit.

Q3: What are the key differences in forward voltage characteristics?

A: VT1045BP-M3/4W specifies 680 mV maximum forward voltage at 10 A. STPS1045D specifies 600 mV at 10 A, representing an 80 mV improvement. STPS745D specifies 840 mV, but this is measured at 15 A, not directly comparable at 10 A operation. Forward voltage affects power dissipation and thermal performance in rectifier circuits.

Q4: How do reverse leakage currents compare?

A: VT1045BP-M3/4W specifies 500 µA reverse leakage at 45 V. Both STPS1045D and STPS745D specify 100 µA at 45 V, representing a 5-fold reduction. Lower reverse leakage improves circuit efficiency and reduces standby power consumption in applications sensitive to leakage current.

Q5: Are there thermal design considerations when substituting?

A: Yes. The VT1045BP-M3/4W operates to 200°C maximum junction temperature, while both STMicroelectronics substitutes are rated to 175°C. This 25°C difference may affect thermal margin in high-temperature applications. Verify that the application's thermal design does not rely on the higher temperature rating of the original part.

Q6: Do all three parts use identical packaging?

A: Yes. All three parts use TO-220-2 package in TO-220AC supplier device package configuration. Through Hole mounting type is identical across all parts. PCB layout and thermal management considerations remain unchanged during substitution.

Q7: Are compliance certifications equivalent across all three parts?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts. Regulatory compliance does not differentiate these substitutes.