STB4045C Equivalent & Substitute Parts

Part Overview

The STB4045C is an active Schottky diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode design in a Surface Mount TO-263-3 (D2PAK) package. This component is designed for applications requiring fast recovery rectification at 45 V maximum reverse voltage with surface mount integration. The part is in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

STB4045C

SMC Diode SolutionsIn Stock: 1601STB4045C Datasheet

Current PartRFQ

VBT4045C-E3/8W

Vishay General Semiconductor - Diodes DivisionIn Stock: 7621VBT4045C-E3/8W Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STB4045C is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Diode Configuration: 1 Pair Common Cathode (identical topology required)
• Technology: Schottky (fast recovery rectification characteristic)
• Voltage - DC Reverse (Vr) (Max): 45 V (maximum blocking voltage)
• Voltage - Forward (Vf) (Max) @ If: 580 mV @ 20 A (forward conduction characteristic)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (switching performance)
• Current - Reverse Leakage @ Vr: 3 mA @ 45 V (leakage specification)

Mechanical Equivalence Criteria:

• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB (identical footprint and pinout)
• Mounting Type: Surface Mount (assembly compatibility)

Compliance Equivalence Criteria:

• RoHS3 Compliance (environmental regulation)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (handling and storage compatibility)

The substitute part VBT4045C-E3/8W meets all electrical, mechanical, and compliance equivalence criteria and is therefore a direct functional substitute for the STB4045C.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: STB4045C

The STB4045C is the original specified component and remains the first choice for new designs and existing production runs. It is in active production status with full RoHS3 compliance and REACH Affected designation. This part carries a current inventory of 1530 units in new original condition.

Substitute Part: VBT4045C-E3/8W

The VBT4045C-E3/8W from Vishay General Semiconductor - Diodes Division is a direct electrical and mechanical equivalent. It meets all critical parameter specifications including diode configuration, Schottky technology, 45 V reverse voltage rating, 580 mV forward voltage at 20 A, fast recovery switching speed, and identical TO-263-3 D2PAK package. Both parts carry RoHS3 compliance and MSL Level 1 (Unlimited) ratings.

The operating temperature range of the VBT4045C-E3/8W (-40°C ~ 150°C) overlaps with the STB4045C range (-55°C ~ 150°C). Applications requiring operation below -40°C must use the STB4045C. The VBT4045C-E3/8W is available with higher inventory (7577 units) and carries REACH Unaffected status, which may provide supply chain advantages in certain regions.

Both parts are suitable for direct substitution in applications where the operating temperature range of -40°C to 150°C is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the VBT4045C-E3/8W replace the STB4045C in all applications?

A: The VBT4045C-E3/8W is electrically and mechanically equivalent to the STB4045C for all applications operating within the temperature range of -40°C to 150°C. Applications requiring operation below -40°C must use the STB4045C, which is rated to -55°C.

Q: Are the package footprints identical?

A: Yes. Both the STB4045C and VBT4045C-E3/8W use the TO-263-3 D2PAK (2 Leads + Tab) package with identical pinout and mechanical dimensions. No PCB layout modifications are required for substitution.

Q: What is the significance of the "1 Pair Common Cathode" configuration?

A: This configuration indicates the diode array contains two diodes sharing a common cathode connection. This topology is critical for certain circuit applications and must be maintained in any substitute part. The VBT4045C-E3/8W maintains this identical configuration.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the STB4045C and VBT4045C-E3/8W are ROHS3 Compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard surface mount assembly processes.

Q: What is the difference in REACH status between these parts?

A: The STB4045C carries REACH Affected status, while the VBT4045C-E3/8W is REACH Unaffected. This distinction may impact supply chain considerations in specific regions but does not affect electrical performance or functional compatibility.

Q: Can these parts be used interchangeably in existing production?

A: Yes, provided the operating temperature range of -40°C to 150°C is acceptable for the application. Both parts meet identical electrical specifications, carry equivalent compliance certifications, and use identical packaging. Substitution requires no design changes or PCB modifications.