VT1045C-M3/4W Equivalent & Substitute Parts

Part Overview

The VT1045C-M3/4W is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 5 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 format and is currently in Active product status.

Substitute parts are necessary when the VT1045C-M3/4W reaches end-of-life, inventory depletion, or when design requirements necessitate alternative electrical or thermal characteristics. The substitute parts listed maintain compatibility with the primary electrical specifications while offering enhanced current ratings or improved thermal performance.

Substiute Parts

VT1045C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 923VT1045C-M3/4W Datasheet

Current PartRFQ

MBR20L45CTG

onsemiIn Stock: 1813MBR20L45CTG Datasheet

MFR RecommendedRFQ

STPS1045D

STMicroelectronicsIn Stock: 55269STPS1045D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VT1045C-M3/4W is determined by the following critical parameters:

Primary Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 45 V (minimum requirement)
• Mounting Type: Through Hole
• Package / Case: TO-220-3 or compatible TO-220 variants

Secondary Compatibility Criteria:

• Current - Average Rectified (Io): Equal to or greater than 5 A per diode
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts MBR20L45CTG and STPS1045D both satisfy the primary and secondary compatibility criteria. Both devices maintain the 45 V reverse voltage rating, Schottky technology, and Through Hole mounting configuration. Both substitute parts provide equal or enhanced current ratings (10 A per diode) compared to the original 5 A specification, enabling direct substitution in applications requiring the VT1045C-M3/4W.

Parameter Comparison

Engineering Selection Recommendations

MBR20L45CTG (onsemi): This substitute part maintains full electrical compatibility with the VT1045C-M3/4W while providing doubled current capacity (10 A versus 5 A per diode). The device is packaged in TO-220-3 format, ensuring direct pin compatibility. The MBR20L45CTG carries ROHS3 compliance and MSL 1 rating identical to the original part. However, the product status is listed as Obsolete, indicating this part may face future availability constraints. The extended operating temperature range (-55°C to 150°C) provides enhanced low-temperature performance compared to the original specification.

STPS1045D (STMicroelectronics): This substitute part provides equivalent electrical performance with enhanced current capacity (10 A versus 5 A). The STPS1045D is packaged in TO-220-2 format, which differs from the original TO-220-3 configuration. This package difference requires verification of PCB layout compatibility, as the pin count and spacing differ. The device maintains ROHS3 compliance and MSL 1 rating. The STPS1045D is in Active product status with extended maximum junction temperature (175°C), offering superior thermal performance. The reverse leakage current is reduced to 100 µA at 45 V, compared to 500 µA in the original specification.

For applications requiring direct pin-for-pin replacement with maintained availability, the STPS1045D is the preferred selection due to its Active product status. For applications where the TO-220-3 package configuration is mandatory, the MBR20L45CTG provides compatibility, though future availability should be confirmed with the supplier.

Frequently Asked Questions (FAQ)

Q: Can the MBR20L45CTG directly replace the VT1045C-M3/4W?

A: Yes. Both devices feature identical 1 Pair Common Cathode configuration, 45 V reverse voltage rating, and TO-220-3 packaging. The MBR20L45CTG provides 10 A current capacity compared to the original 5 A specification, making it electrically compatible for direct substitution. However, the MBR20L45CTG is listed as Obsolete, which may impact long-term availability.

Q: Can the STPS1045D directly replace the VT1045C-M3/4W?

A: Electrical substitution is possible, but package configuration differs. The STPS1045D is packaged in TO-220-2 format, while the original VT1045C-M3/4W uses TO-220-3. This difference affects pin count and spacing. PCB layout compatibility must be verified before implementation. The STPS1045D is in Active product status, ensuring continued availability.

Q: What is the significance of the diode configuration difference between the VT1045C-M3/4W and STPS1045D?

A: The VT1045C-M3/4W is a diode array with 1 Pair Common Cathode configuration, containing two diodes with a shared cathode terminal. The STPS1045D is a single diode device. This configuration difference requires circuit design review to ensure the application topology accommodates the single-diode architecture.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both MBR20L45CTG and STPS1045D carry ROHS3 Compliant status, matching the original VT1045C-M3/4W specification.

Q: What is the impact of the forward voltage difference between substitute parts?

A: The VT1045C-M3/4W specifies 580 mV forward voltage at 5 A. The MBR20L45CTG specifies 500 mV at 10 A, while the STPS1045D specifies 600 mV at 10 A. Forward voltage differences affect power dissipation and thermal performance. Lower forward voltage reduces heat generation. Applications with thermal constraints should evaluate the STPS1045D's lower reverse leakage current (100 µA versus 500 µA) as a compensating factor.

Q: Which substitute part offers the best thermal performance?

A: The STPS1045D provides the highest maximum junction temperature rating (175°C) compared to the VT1045C-M3/4W (150°C) and MBR20L45CTG (150°C). The STPS1045D also features reduced reverse leakage current (100 µA), which contributes to lower thermal generation in reverse-biased conditions.

Q: Is the extended operating temperature range of the MBR20L45CTG (-55°C to 150°C) significant?

A: The MBR20L45CTG extends the minimum operating temperature to -55°C compared to the original -40°C specification. This enhancement is relevant for applications requiring operation in extreme cold environments. For standard industrial temperature ranges, this difference is not typically a selection criterion.