STPS1045FP Schottky Diode Equivalent & Substitute Parts

Part Overview

The STPS1045FP is a 45V, 10A Schottky rectifier diode manufactured by STMicroelectronics in a TO-220FPAC through-hole package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. The STPS1045FP serves as a fast recovery rectifier suitable for power supply and switching applications requiring low forward voltage drop and rapid switching characteristics.

Substiute Parts

STPS1045FP

STMicroelectronicsIn Stock: 3644STPS1045FP Datasheet

Current PartRFQ

STPS1045D

STMicroelectronicsIn Stock: 55269STPS1045D Datasheet

SimilarRFQ

MBRF1045

Taiwan Semiconductor CorporationIn Stock: 6073MBRF1045 Datasheet

DirectRFQ

DSB10I45PM

IXYSIn Stock: 1175DSB10I45PM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS1045FP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V minimum
• Current - Average Rectified (Io): 10 A minimum
• Technology: Schottky rectifier
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-220-2 or equivalent isolated tab variants
• Operating Temperature Range: Support for junction temperatures up to 175°C or higher

Compliance Criteria:

• RoHS3 Compliant
• REACH Unaffected status

All substitute parts listed meet or exceed these parameters and maintain functional equivalence for the STPS1045FP application space.

Parameter Comparison

Engineering Selection Recommendations

STPS1045D (STMicroelectronics)

The STPS1045D is the primary substitute for the STPS1045FP. Both components share identical electrical specifications, including 45V reverse voltage, 10A average rectified current, and 600 mV forward voltage drop at 10A. The STPS1045D maintains active product status with 55,200 units in stock. The primary difference is the package variant: STPS1045D uses TO-220AC versus the STPS1045FP's TO-220FPAC. Both are through-hole mounted with equivalent thermal and electrical performance. RoHS3 compliance and REACH unaffected status are maintained. This substitute is recommended for direct replacement in applications where package footprint compatibility exists.

MBRF1045 (Taiwan Semiconductor Corporation)

The MBRF1045 provides electrical equivalence with 45V reverse voltage and 10A average rectified current. Forward voltage is specified at 700 mV @ 10A, representing a 100 mV increase compared to the STPS1045FP. The MBRF1045 operates within a temperature range of -55°C to 150°C, with maximum junction temperature of 150°C versus 175°C for the STPS1045FP. This component is suitable for applications where the higher forward voltage drop and lower maximum junction temperature are acceptable. RoHS3 compliance and REACH unaffected status are maintained. Inventory availability is 5,991 units.

DSB10I45PM (IXYS)

The DSB10I45PM meets electrical requirements with 45V reverse voltage and 10A average rectified current. Forward voltage is specified at 560 mV @ 10A, representing a 40 mV improvement over the STPS1045FP. Reverse leakage current is specified at 7 mA @ 45V, significantly higher than the 100 µA specification of the STPS1045FP. Operating temperature range is -55°C to 150°C with maximum junction temperature of 150°C. The package includes an isolated tab variant (TO-220FP). This component is suitable for applications where lower forward voltage drop is prioritized and higher reverse leakage is acceptable. RoHS3 compliance and REACH unaffected status are maintained. Inventory availability is 1,160 units.

Frequently Asked Questions (FAQ)

Q: Can the STPS1045D directly replace the STPS1045FP?

A: The STPS1045D provides electrical equivalence with identical voltage and current ratings. The primary difference is the package designation: TO-220AC versus TO-220FPAC. Both are through-hole mounted TO-220-2 packages. Direct replacement is possible if the PCB layout accommodates the package variant. Verify pin configuration and thermal pad compatibility with your specific application.

Q: What is the significance of the forward voltage difference between STPS1045FP and MBRF1045?

A: The STPS1045FP specifies 600 mV forward voltage at 10A, while the MBRF1045 specifies 700 mV at the same current. This 100 mV difference results in increased power dissipation in the MBRF1045. For applications with tight thermal budgets or high-frequency switching, this difference may impact overall circuit efficiency. Calculate power dissipation (P = Vf × I) for your specific operating conditions to determine acceptability.

Q: Why does the DSB10I45PM have significantly higher reverse leakage current?

A: The DSB10I45PM specifies 7 mA reverse leakage at 45V, compared to 100 µA for the STPS1045FP. This represents a 70-fold increase. Reverse leakage current contributes to standby power consumption and heat generation. Applications requiring minimal standby current or operating in high-temperature environments should account for this specification difference. Verify that your circuit design tolerates the increased leakage current.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The STPS1045FP, STPS1045D, MBRF1045, and DSB10I45PM are all RoHS3 compliant with REACH unaffected status. All components carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Q: What is the maximum junction temperature difference between substitutes?

A: The STPS1045FP and STPS1045D both specify 175°C maximum junction temperature. The MBRF1045 and DSB10I45PM specify 150°C maximum junction temperature. This 25°C difference may impact thermal design margins in high-temperature applications. Verify that your thermal management design accommodates the lower maximum junction temperature of alternative manufacturers' components.

Q: Can I use the DSB10I45PM in a high-frequency switching application?

A: The DSB10I45PM meets the fast recovery specification (≤ 500ns, > 200mA Io) required for switching applications. However, the lower forward voltage (560 mV) and higher reverse leakage (7 mA) should be evaluated against your specific circuit requirements. The lower forward voltage provides efficiency benefits, while the higher reverse leakage may require additional circuit considerations for standby operation.

Q: What packaging considerations apply to these substitutes?

A: All substitutes are through-hole mounted in TO-220-2 package variants. The STPS1045FP uses TO-220FPAC, STPS1045D uses TO-220AC, MBRF1045 uses ITO-220AC, and DSB10I45PM uses TO-220FP with isolated tab. Verify that your PCB layout and thermal management design accommodate the specific package variant. The isolated tab variants (STPS1045FP and DSB10I45PM) may provide improved thermal performance in certain mounting configurations.