Equivalent & Substitute Parts for 18TQ045S Schottky Rectifier Diode

Part Overview

The 18TQ045S is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 18 A average rectified current in a surface mount TO-263AB (D2PAK) package. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs and new production applications.

Substiute Parts

18TQ045S

Vishay General Semiconductor - Diodes DivisionIn Stock: 98018TQ045S Datasheet

Current PartRFQ

VS-18TQ045SHM3

Vishay General Semiconductor - Diodes DivisionIn Stock: 1178VS-18TQ045SHM3 Datasheet

Parametric EquivalentRFQ

VS-18TQ045STRL-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 1017VS-18TQ045STRL-M3 Datasheet

Parametric EquivalentRFQ

VS-18TQ045STRR-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 731VS-18TQ045STRR-M3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 18TQ045S is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V
• Current - Average Rectified (Io): 18 A
• Voltage - Forward (Vf) (Max) @ If: 600 mV @ 18 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 2.5 mA @ 45 V
• Operating Temperature - Junction: -55°C ~ 175°C

Mechanical Equivalence Criteria:

• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Mounting Type: Surface Mount
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these core parameters. Differences in packaging format (Tube, Tape & Reel) and product status (Active vs. Obsolete) do not affect electrical or mechanical compatibility. RoHS compliance status and automotive qualification represent secondary attributes that may influence procurement decisions based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitution Path:

The 18TQ045S is obsolete and no longer in active production. All three substitute parts—VS-18TQ045SHM3, VS-18TQ045STRL-M3, and VS-18TQ045STRR-M3—are active products from the same manufacturer with identical electrical and mechanical specifications. These parts are direct functional replacements suitable for both new designs and legacy system repairs.

Compliance Considerations:

All substitute parts are ROHS3 compliant, whereas the original 18TQ045S is RoHS non-compliant. This compliance upgrade is advantageous for applications subject to RoHS regulations and modern supply chain requirements.

Packaging Format Selection:

• VS-18TQ045SHM3 (Tube packaging): Suitable for lower-volume applications, manual assembly, or kitting operations.
• VS-18TQ045STRL-M3 and VS-18TQ045STRR-M3 (Tape & Reel packaging): Optimized for high-volume automated assembly processes.

Automotive Applications:

VS-18TQ045SHM3 carries AEC-Q101 automotive qualification, making it the preferred choice for automotive and mission-critical applications requiring formal qualification documentation.

Inventory Availability:

All three substitute parts maintain adequate stock levels (712–1069 pieces), ensuring supply continuity for production requirements.

Frequently Asked Questions (FAQ)

Q: Can VS-18TQ045SHM3, VS-18TQ045STRL-M3, and VS-18TQ045STRR-M3 be used interchangeably with 18TQ045S?

A: Yes. All three substitute parts are electrically and mechanically equivalent to the 18TQ045S. They share identical voltage ratings (45 V), current ratings (18 A), forward voltage characteristics (600 mV @ 18 A), switching speed (Fast Recovery ≤ 500ns), and package configuration (TO-263AB D2PAK). The differences are packaging format and product status, not functional performance.

Q: What is the difference between the three substitute parts?

A: The electrical and mechanical specifications are identical across all three parts. The primary differences are:

• VS-18TQ045SHM3: Supplied in Tube packaging; includes AEC-Q101 automotive qualification.
• VS-18TQ045STRL-M3 and VS-18TQ045STRR-M3: Supplied in Tape & Reel (TR) packaging for automated assembly; both are active products.

Selection depends on assembly process requirements and application qualification needs.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant. The original 18TQ045S is RoHS non-compliant. This compliance upgrade aligns with current environmental regulations and supply chain standards.

Q: Does the reverse leakage current specification differ between parts?

A: The 18TQ045S and VS-18TQ045SHM3 specify 2.5 mA @ 45 V. VS-18TQ045STRL-M3 and VS-18TQ045STRR-M3 specify 2.5 mA @ 35 V. This difference does not affect substitution compatibility, as the leakage current at the lower voltage (35 V) is a subset condition of the higher voltage specification (45 V).

Q: Can these parts be used in automotive applications?

A: VS-18TQ045SHM3 carries AEC-Q101 automotive qualification and is suitable for automotive applications. VS-18TQ045STRL-M3 and VS-18TQ045STRR-M3 do not list automotive qualification; their suitability for automotive applications depends on specific design and procurement requirements.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the original 18TQ045S and all substitutes, have Moisture Sensitivity Level (MSL) 1 (Unlimited). This indicates no moisture sensitivity restrictions and no special storage or handling requirements.

Q: Are there any thermal or operating temperature differences?

A: No. All parts operate across the identical junction temperature range of -55°C to 175°C, ensuring thermal compatibility in all operating environments.