ST1045S Equivalent & Substitute Parts

Part Overview

The ST1045S is a Schottky rectifier diode manufactured by SMC Diode Solutions, rated for 45 V DC reverse voltage with a maximum forward voltage of 570 mV at 10 A. The device is packaged in a Surface Mount TO-277B (3-PowerDFN) configuration and is currently in Active product status. This part is suitable for applications requiring fast recovery rectification in power conversion and switching circuits.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the critical parameters that define the functional requirements of the application. The substitute identified for the ST1045S operates within the same voltage and current specifications while maintaining compatible packaging and thermal characteristics.

Substiute Parts

ST1045S

SMC Diode SolutionsIn Stock: 5813ST1045S Datasheet

Current PartRFQ

PMEG045V100EPDAZ

Nexperia USA Inc.In Stock: 800226PMEG045V100EPDAZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST1045S with the PMEG045V100EPDAZ is based on the following electrical and mechanical equivalence criteria:

Voltage Rating Equivalence: Both parts maintain a 45 V DC reverse voltage maximum rating, ensuring compatibility in circuits designed for this voltage class.

Package Compatibility: Both devices utilize the TO-277 / 3-PowerDFN surface mount package, enabling direct mechanical and thermal interface compatibility on printed circuit boards.

Technology Class: Both parts employ Schottky rectifier technology, maintaining identical switching characteristics and forward conduction behavior.

Fast Recovery Specification: Both parts meet the fast recovery requirement of ≤ 500ns for recovery time at currents > 200mA, ensuring equivalent transient response in switching applications.

Surface Mount Configuration: Both parts are surface mount devices with identical mounting type and thermal dissipation characteristics.

Environmental Compliance: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting identical environmental and handling requirements.

The substitute part PMEG045V100EPDAZ differs in product status (Not For New Designs) and carries automotive qualification (AEC-Q101), which may influence selection based on application requirements and design lifecycle considerations.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (ST1045S): The ST1045S is the recommended choice for new designs. This part carries Active product status, ensuring long-term availability and manufacturer support. It meets all ROHS3 compliance requirements and carries unlimited moisture sensitivity rating, suitable for standard manufacturing environments.

Substitute Selection (PMEG045V100EPDAZ): The PMEG045V100EPDAZ is electrically equivalent and mechanically compatible but carries a "Not For New Designs" product status designation. This part is suitable for replacement, repair, or legacy system applications where the original part is unavailable. The part carries AEC-Q101 automotive qualification, indicating suitability for automotive-grade applications if required.

Compliance Considerations: Both parts are ROHS3 compliant and carry identical MSL ratings. The substitute part is REACH Unaffected, while the main part is REACH Affected. This distinction may influence supply chain and regulatory documentation requirements depending on application geography and end-use classification.

Thermal Performance: The substitute part offers a higher maximum junction temperature (175°C vs. 150°C), providing additional thermal margin in high-temperature operating environments.

Forward Voltage Characteristics: The substitute part exhibits lower forward voltage (490 mV vs. 570 mV at 10 A), resulting in reduced power dissipation and improved efficiency in rectification applications.

Frequently Asked Questions (FAQ)

Q: Can the PMEG045V100EPDAZ be used as a direct replacement for the ST1045S?

A: Yes, the PMEG045V100EPDAZ is electrically and mechanically compatible with the ST1045S. Both parts share identical 45 V voltage rating, fast recovery characteristics, TO-277 package configuration, and surface mount mounting type. The substitute part can be used in applications where the ST1045S is specified, with consideration for the product status difference.

Q: What is the significance of the "Not For New Designs" status on the PMEG045V100EPDAZ?

A: "Not For New Designs" indicates that the manufacturer recommends this part for existing applications and replacement scenarios only. For new product development, the ST1045S (Active status) is the preferred choice to ensure long-term availability and manufacturer support throughout the product lifecycle.

Q: Are there differences in forward voltage performance between these parts?

A: Yes. The PMEG045V100EPDAZ exhibits a forward voltage of 490 mV at 10 A, compared to 570 mV for the ST1045S. This 80 mV difference results in lower power dissipation in the substitute part, which may improve overall circuit efficiency. Both values are within acceptable ranges for Schottky rectifier applications.

Q: Do both parts meet the same environmental and compliance standards?

A: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The PMEG045V100EPDAZ carries AEC-Q101 automotive qualification, while the ST1045S does not specify this qualification. REACH status differs: the ST1045S is REACH Affected, while the substitute is REACH Unaffected.

Q: What is the difference in reverse leakage current between these parts?

A: The ST1045S specifies 800 µA reverse leakage at 45 V, while the PMEG045V100EPDAZ specifies 50 µA at 10 V. These measurements are taken at different voltage levels, making direct comparison not applicable. Both values are within acceptable ranges for Schottky rectifier technology.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Both parts use identical TO-277 / 3-PowerDFN surface mount packaging and mounting type. PCB footprints, solder reflow profiles, and thermal management approaches are identical between the two parts, enabling direct substitution at the assembly level.

Q: What is the maximum junction temperature for each part?

A: The ST1045S operates to a maximum junction temperature of 150°C, while the PMEG045V100EPDAZ operates to 175°C. The substitute part provides 25°C additional thermal margin, which may be beneficial in high-temperature applications or environments with elevated ambient temperatures.

Q: Are the fast recovery characteristics identical between these parts?

A: Yes. Both parts meet the fast recovery specification of ≤ 500ns for recovery time at currents exceeding 200mA. The PMEG045V100EPDAZ additionally specifies a reverse recovery time (trr) of 37 ns, providing quantified performance data for transient analysis.