ST1545S Schottky Diode 45V Equivalent & Substitute Parts

Part Overview

The ST1545S is a surface mount Schottky diode manufactured by SMC Diode Solutions, rated for 45 V DC reverse voltage with fast recovery characteristics. This component is classified as Active product status and is RoHS3 compliant. The ST1545S is packaged in TO-277B (3-PowerDFN) format for surface mount applications. Equivalent and substitute parts are identified when they share identical or compatible electrical ratings, mechanical packaging, and operational specifications that permit direct replacement in circuit designs without functional degradation.

Substiute Parts

ST1545S

SMC Diode SolutionsIn Stock: 5009ST1545S Datasheet

Current PartRFQ

PMEG045T050EPDZ

Nexperia USA Inc.In Stock: 2499PMEG045T050EPDZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST1545S is determined by equivalence in the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
• Technology: Must be Schottky diode type
• Speed: Must support Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Must be Surface Mount

Mechanical Compatibility Criteria:

• Package / Case: Must be TO-277, 3-PowerDFN format
• Supplier Device Package: Must be compatible with TO-277B footprint

Compliance Criteria:

• RoHS Status: Must be ROHS3 Compliant
• Moisture Sensitivity Level: Must be MSL 1 (Unlimited)

The PMEG045T050EPDZ from Nexperia USA Inc. meets all substitution criteria. Both parts share identical reverse voltage ratings (45 V), Schottky technology, fast recovery speed characteristics, surface mount configuration, and TO-277 package format. Both components are RoHS3 compliant with MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

ST1545S (SMC Diode Solutions)

The ST1545S is an Active product with full RoHS3 compliance and REACH Affected status. This component is suitable for applications requiring standard Schottky diode performance at 45 V with fast recovery characteristics. The part is available in high inventory volume (4976 Pcs) and is classified under ECCN EAR99 with HTSUS code 8541.10.0080.

PMEG045T050EPDZ (Nexperia USA Inc.)

The PMEG045T050EPDZ is an Active product with RoHS3 compliance and REACH Unaffected status. This component includes automotive-grade qualification (AEC-Q101) and is rated for higher maximum junction temperature (175°C vs. 150°C). The part features lower reverse leakage current (44 µA vs. 800 µA at 45 V) and includes specified reverse recovery time (24 ns). Inventory availability is 2400 Pcs. This component is classified under ECCN EAR99 with HTSUS code 8541.10.0080.

Both parts are functionally interchangeable for 45 V Schottky diode applications. Selection between them depends on specific application requirements regarding temperature range, reverse leakage specifications, and automotive qualification needs.

Frequently Asked Questions (FAQ)

Q: Can the PMEG045T050EPDZ directly replace the ST1545S in existing designs?

A: Yes. Both components share identical reverse voltage ratings (45 V), Schottky technology, fast recovery speed characteristics, and TO-277 package format. The mechanical footprint and electrical performance are compatible for direct substitution.

Q: What is the difference in forward voltage between these parts?

A: The ST1545S specifies 590 mV maximum forward voltage at 15 A, while the PMEG045T050EPDZ specifies 465 mV maximum at 5 A. The PMEG045T050EPDZ exhibits lower forward voltage drop at its rated current. Forward voltage characteristics are current-dependent and must be evaluated within the specific application's operating current range.

Q: Are there differences in reverse leakage current?

A: Yes. The ST1545S specifies 800 µA reverse leakage at 45 V, while the PMEG045T050EPDZ specifies 44 µA at 45 V. The PMEG045T050EPDZ exhibits significantly lower reverse leakage. Applications sensitive to leakage current performance should account for this difference.

Q: What is the significance of the AEC-Q101 qualification on the PMEG045T050EPDZ?

A: AEC-Q101 is an automotive industry qualification standard. The PMEG045T050EPDZ meets this qualification, making it suitable for automotive applications. The ST1545S does not carry this designation.

Q: Do both parts have the same operating temperature range?

A: No. The ST1545S operates from -55°C to 150°C junction temperature, while the PMEG045T050EPDZ operates to a maximum of 175°C. The PMEG045T050EPDZ supports higher temperature operation. Application thermal requirements should be considered when selecting between these parts.

Q: What is the difference between TO-277B and CFP15 package designations?

A: Both designations refer to the same physical TO-277, 3-PowerDFN package format. TO-277B is the SMC supplier device package designation, while CFP15 is the Nexperia supplier device package designation. The mechanical footprint and pin configuration are identical.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the ST1545S and PMEG045T050EPDZ are RoHS3 compliant. Both have MSL 1 (Unlimited) moisture sensitivity rating.

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

A: The ST1545S carries REACH Affected status, while the PMEG045T050EPDZ carries REACH Unaffected status. Applications subject to REACH regulatory requirements should verify compliance with their specific regulatory obligations.