Equivalent & Substitute Parts for 18TQ035STRL

Part Overview

The 18TQ035STRL is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 35 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 improved product status and compliance certifications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	35 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 @ 35 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 18TQ035STRL is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 35 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 @ 35 V
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 requirements without exception. Variations in packaging format (Tube, Tape & Reel) and product status (Active vs. Obsolete) do not affect electrical or mechanical compatibility. Additional certifications such as AEC-Q101 automotive qualification and RoHS3 compliance represent enhancements to the base specification.

Parameter Comparison

Parameter	18TQ035STRL	VS-18TQ035S-M3	VS-18TQ035STRLHM3	VS-18TQ035STRRHM3
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)	35 V	35 V	35 V	35 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 @ 35 V	2.5 mA @ 35 V	2.5 mA @ 35 V	2.5 mA @ 35 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 Applications: VS-18TQ035S-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.

For Automotive Applications: VS-18TQ035STRLHM3 and VS-18TQ035STRRHM3 are both qualified to AEC-Q101 automotive standards with RoHS3 compliance. These parts are supplied in Tape & Reel format, appropriate for high-volume production environments. Selection between these two automotive-grade options depends on packaging and supply chain requirements.

All three substitute parts are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) and maintain identical electrical characteristics to the obsolete 18TQ035STRL. The transition from obsolete to active product status ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can VS-18TQ035S-M3 be used as a direct replacement for 18TQ035STRL?

A: Yes. VS-18TQ035S-M3 is electrically and mechanically equivalent to 18TQ035STRL. Both parts share identical voltage ratings (35 V), current ratings (18 A), forward voltage characteristics (600 mV @ 18 A), switching speed (Fast Recovery ≤ 500ns), reverse leakage current (2.5 mA @ 35 V), and TO-263AB package specifications. The primary difference is product status: VS-18TQ035S-M3 is active while 18TQ035STRL is obsolete.

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

A: All three substitute parts (VS-18TQ035S-M3, VS-18TQ035STRLHM3, VS-18TQ035STRRHM3) are electrically identical. The differences are: (1) Packaging format: VS-18TQ035S-M3 is supplied in Tube; VS-18TQ035STRLHM3 and VS-18TQ035STRRHM3 are supplied in Tape & Reel; (2) Automotive qualification: VS-18TQ035STRLHM3 and VS-18TQ035STRRHM3 carry AEC-Q101 automotive qualification; VS-18TQ035S-M3 does not.

Q: Are the automotive-qualified parts (VS-18TQ035STRLHM3 and VS-18TQ035STRRHM3) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed general industrial specifications. AEC-Q101 qualification represents additional testing and quality assurance beyond standard requirements. These parts are fully compatible with non-automotive applications.

Q: What is the difference between VS-18TQ035STRLHM3 and VS-18TQ035STRRHM3?

A: Both parts are electrically and mechanically identical with identical AEC-Q101 automotive qualification. Both are supplied in Tape & Reel packaging. The part number suffix difference (HM3 vs. RR) reflects internal Vishay manufacturing designations but does not affect electrical performance or mechanical compatibility.

Q: Is the TO-263AB package compatible with existing PCB layouts designed for 18TQ035STRL?

A: Yes. All substitute parts use the identical TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package. PCB footprints, thermal management characteristics, and mechanical mounting requirements are unchanged.

Q: Does RoHS3 compliance affect circuit performance?

A: No. RoHS3 compliance relates to material composition and environmental standards, not electrical performance. All substitute parts maintain identical electrical characteristics to the original 18TQ035STRL.

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