18TQ045STRL Schottky Diode Equivalent & Substitute Parts

Part Overview

The 18TQ045STRL 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 for new designs and ongoing production requirements. Substitute parts maintain identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
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
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 175°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution eligibility for the 18TQ045STRL is determined by strict equivalence across the following electrical and mechanical parameters:

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)
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C ~ 175°C

All identified substitute parts meet these core electrical and mechanical requirements. Variations in packaging format (Tube versus Tape & Reel), product status (Active versus Obsolete), and compliance certifications (RoHS3, AEC-Q101) are secondary differentiators that do not affect functional interchangeability in equivalent circuit applications.

Parameter Comparison

Parameter	18TQ045STRL	VS-18TQ045S-M3	VS-18TQ045STRLHM3	VS-18TQ045STRRHM3
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	18 A	18 A	18 A	18 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 18 A	600 mV @ 18 A	600 mV @ 18 A	600 mV @ 18 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2.5 mA @ 45 V	2.5 mA @ 35 V	2.5 mA @ 45 V	2.5 mA @ 45 V
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Grade	Not specified	Not specified	Automotive	Automotive
Qualification	Not specified	Not specified	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

For General Industrial Applications:

VS-18TQ045S-M3 is the direct functional equivalent with active product status and RoHS3 compliance. This part is supplied in Tube packaging and is suitable for applications where automotive qualification is not required. The part maintains all core electrical parameters and mechanical compatibility with the obsolete 18TQ045STRL.

For Automotive Applications:

VS-18TQ045STRLHM3 and VS-18TQ045STRRHM3 are both qualified to AEC-Q101 automotive standards and supplied in Tape & Reel format. Both parts are functionally equivalent and carry RoHS3 compliance. Selection between these two automotive-grade options depends on supply chain and packaging format requirements. VS-18TQ045STRRHM3 maintains higher inventory availability.

Compliance Considerations:

All substitute parts are RoHS3 compliant, addressing regulatory requirements that the obsolete 18TQ045STRL does not meet. The automotive-qualified variants (VS-18TQ045STRLHM3 and VS-18TQ045STRRHM3) provide additional assurance for applications subject to automotive supply chain qualification requirements.

Frequently Asked Questions (FAQ)

Q: Can VS-18TQ045S-M3 be used as a direct replacement for 18TQ045STRL in existing designs?

A: Yes. VS-18TQ045S-M3 maintains identical electrical ratings (45 V, 18 A, 600 mV forward voltage) and mechanical compatibility (TO-263AB package, surface mount). The primary difference is product status (Active versus Obsolete) and RoHS3 compliance. Packaging format differs (Tube versus unspecified), which affects procurement and assembly processes but not circuit performance.

Q: What is the difference between VS-18TQ045S-M3 and the automotive-qualified alternatives?

A: VS-18TQ045S-M3 is a general industrial-grade part supplied in Tube packaging. VS-18TQ045STRLHM3 and VS-18TQ045STRRHM3 are automotive-grade parts qualified to AEC-Q101 and supplied in Tape & Reel format. All three maintain identical electrical performance. Automotive qualification is required only for applications subject to automotive supply chain standards.

Q: Are there differences in reverse leakage current between the substitute parts?

A: VS-18TQ045S-M3 specifies reverse leakage current at 35 V, while 18TQ045STRL, VS-18TQ045STRLHM3, and VS-18TQ045STRRHM3 specify it at 45 V. All parts specify 2.5 mA maximum leakage at their respective measurement voltages. This difference reflects measurement methodology and does not affect functional equivalence.

Q: Which substitute part should be selected for high-volume production?

A: VS-18TQ045STRRHM3 offers the highest inventory availability (1140 Pcs) and is supplied in Tape & Reel format, which is optimized for automated assembly processes. This part is suitable for high-volume production requiring automotive qualification.

Q: Is the TO-263AB package identical across all parts?

A: Yes. All parts use the TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package. Mechanical dimensions, pin configuration, and thermal characteristics are identical, ensuring direct PCB compatibility without layout modifications.

Q: What is the significance of the capacitance specification in substitute parts?

A: VS-18TQ045S-M3, VS-18TQ045STRLHM3, and VS-18TQ045STRRHM3 specify capacitance at 1400pF @ 5V, 1MHz. The original 18TQ045STRL does not provide this specification. This additional data in substitute parts does not affect substitution eligibility and reflects improved documentation in active products.

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