STPS1045SF Equivalent & Substitute Parts

Part Overview

The STPS1045SF is an active Schottky rectifier diode manufactured by STMicroelectronics, designed for surface mount applications in the TO-277A package. This component operates at a maximum reverse voltage of 45 V with an average rectified current rating of 10 A, utilizing fast recovery technology suitable for high-frequency switching applications. The part is ROHS3 compliant and carries an unlimited moisture sensitivity level (MSL 1), indicating robust handling characteristics for manufacturing environments.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges, allowing for design flexibility, supply chain optimization, or inventory management across qualified alternatives.

Substiute Parts

STPS1045SF

STMicroelectronicsIn Stock: 6864STPS1045SF Datasheet

Current PartRFQ

FSV2050V

onsemiIn Stock: 15279FSV2050V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STPS1045SF is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed 45 V
• Current - Average Rectified (Io) rating must equal or exceed 10 A
• Technology classification must be Schottky
• Speed characteristic must be Fast Recovery (≤ 500ns, > 200mA)

Mechanical Compatibility Criteria:

• Mounting type must be Surface Mount
• Package classification must be TO-277 or 3-PowerDFN variant
• Supplier device package must be compatible with TO-277 footprint

Compliance & Environmental Criteria:

• RoHS3 compliance required
• Moisture Sensitivity Level must be 1 (Unlimited) or equivalent
• REACH Unaffected status required

The FSV2050V from onsemi meets all substitution criteria, offering higher voltage (50 V) and current (20 A) ratings within the same package family, providing design margin for applications requiring the STPS1045SF.

Parameter Comparison

Engineering Selection Recommendations

STPS1045SF Selection: The STPS1045SF remains the primary choice for applications requiring the specified 45 V / 10 A performance envelope. This part is active in production status with substantial inventory availability (6835 pcs), ensuring supply continuity. The component carries full ROHS3 compliance and REACH Unaffected designation, meeting regulatory requirements for industrial and consumer applications. The maximum junction temperature rating of 175°C supports high-temperature operating environments.

FSV2050V Selection: The FSV2050V from onsemi is a qualified substitute offering higher electrical ratings (50 V / 20 A) within the identical TO-277 package family. This part is active in production with higher inventory levels (15240 pcs), providing supply redundancy. The FSV2050V maintains ROHS3 compliance and REACH Unaffected status. The operating temperature range of −55°C to 150°C is suitable for standard industrial applications, though the maximum junction temperature is 25°C lower than the STPS1045SF. The higher reverse leakage current (320 µA @ 50 V versus 50 µA @ 45 V) must be evaluated for low-power or precision applications.

Substitution Applicability: The FSV2050V is electrically and mechanically compatible with the STPS1045SF in applications where the circuit design accommodates the higher voltage and current ratings. The identical package footprint (TO-277, 3-PowerDFN) ensures direct mechanical interchange without PCB redesign. Both parts satisfy identical compliance and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the FSV2050V directly replace the STPS1045SF on the same PCB?

A: Yes. Both components use the TO-277, 3-PowerDFN package with identical mechanical footprints and pinout configurations. No PCB layout modifications are required for physical substitution.

Q: What are the key electrical differences between these parts?

A: The FSV2050V provides higher voltage (50 V vs. 45 V) and current (20 A vs. 10 A) ratings. The reverse leakage current is higher in the FSV2050V (320 µA @ 50 V) compared to the STPS1045SF (50 µA @ 45 V). Both parts share identical fast recovery speed characteristics and Schottky technology.

Q: Are there temperature operating range differences?

A: Yes. The STPS1045SF specifies a maximum junction temperature of 175°C, while the FSV2050V operates within −55°C to 150°C. For applications requiring sustained operation above 150°C, the STPS1045SF is the appropriate selection.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the STPS1045SF and FSV2050V are ROHS3 compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. They are equivalent from a regulatory and environmental standpoint.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on circuit requirements. If the application requires maximum voltage or current headroom, the FSV2050V is suitable. If the application requires operation above 150°C junction temperature, the STPS1045SF is required. Both parts are active in production with stable supply availability.

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

A: The FSV2050V exhibits higher reverse leakage current (320 µA @ 50 V) than the STPS1045SF (50 µA @ 45 V). In applications with strict leakage requirements or low-power standby conditions, this difference must be evaluated against circuit specifications. The higher leakage in the FSV2050V is a characteristic of its higher voltage rating.

Q: Are the packaging and supplier device packages identical?

A: Both parts use the TO-277, 3-PowerDFN package classification. The STPS1045SF supplier device package is designated TO-277A (SMPC), while the FSV2050V is designated TO-277-3. These designations refer to the same physical package family with compatible footprints and pinout.