Equivalent & Substitute Parts for 6TQ045STRR Schottky Diode

Part Overview

The 6TQ045STRR is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 6 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide compatible functionality within the same package form factor and voltage class.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	800	µA @ 45 V
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the 6TQ045STRR is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 45 V
Current - Average Rectified (Io) must equal or exceed 6 A
Technology must be Schottky (fast recovery rectifier)
Speed classification must be Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB or equivalent D2PAK form factor

Compliance Criteria:

RoHS Status: ROHS3 Compliant preferred for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: parametric equivalents (identical electrical ratings) and manufacturer-recommended alternatives (enhanced current ratings within the same package).

Parameter Comparison

Parameter	6TQ045STRR (Main)	VS-6TQ045STRL-M3	VS-6TQ045STRR-M3	STPS745G-TR
Manufacturer	Vishay	Vishay	Vishay	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	6 A	6 A	6 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	600 mV @ 6 A	600 mV @ 6 A	840 mV @ 15 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	800 µA @ 45 V	800 µA @ 45 V	800 µA @ 45 V	100 µA @ 45 V
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature - Junction	-55 to 175°C	-55 to 175°C	-55 to 175°C	Max 175°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Parametric Equivalents (Identical Electrical Ratings):

VS-6TQ045STRL-M3 and VS-6TQ045STRR-M3 are direct parametric equivalents to the 6TQ045STRR. Both parts maintain identical voltage, current, and forward voltage specifications. Both are manufactured by Vishay General Semiconductor - Diodes Division and are classified as active products with ROHS3 compliance. These parts are suitable for direct replacement in applications requiring 45 V, 6 A Schottky rectification. The primary distinction between these equivalents is packaging format (Tape & Reel), which does not affect electrical performance.

Manufacturer-Recommended Substitute (Enhanced Current Rating):

STPS745G-TR is an STMicroelectronics Schottky diode rated for 45 V, 7.5 A in the same D2PAK package. This part provides 25% higher average rectified current capacity while maintaining the same reverse voltage rating and fast recovery speed classification. The STPS745G-TR exhibits lower reverse leakage current (100 µA versus 800 µA at 45 V), resulting in reduced power dissipation in reverse bias conditions. This part is active and ROHS3 compliant. The STPS745G-TR is suitable for applications where the 6 A rating of the original part is marginal or where thermal margin improvement is required.

Compliance Considerations:

All substitute parts are ROHS3 compliant and REACH unaffected, addressing regulatory requirements for new production. The original 6TQ045STRR is RoHS non-compliant and obsolete; transition to an active equivalent or substitute is necessary for continued component sourcing and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can VS-6TQ045STRL-M3 and VS-6TQ045STRR-M3 be used interchangeably with 6TQ045STRR?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (45 V, 6 A, 600 mV forward voltage, fast recovery speed). The primary difference is packaging format (Tape & Reel versus the original format). Both are active products with ROHS3 compliance, making them suitable direct replacements.

Q: What is the difference between VS-6TQ045STRL-M3 and VS-6TQ045STRR-M3?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in the part number suffix, which may indicate internal manufacturing or supply chain designation. Both are manufactured by Vishay and are ROHS3 compliant. Selection between these two should be based on supplier availability and internal part numbering conventions.

Q: Can STPS745G-TR replace 6TQ045STRR in all applications?

A: STPS745G-TR is a functional substitute with compatible voltage and package specifications. It provides higher current capacity (7.5 A versus 6 A) and lower reverse leakage current (100 µA versus 800 µA). Applications operating at or near the 6 A limit will benefit from the increased current rating. However, the higher forward voltage specification (840 mV @ 15 A versus 600 mV @ 6 A) should be evaluated for thermal and efficiency impact in the specific circuit design.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package. This ensures mechanical and thermal compatibility with the original 6TQ045STRR. PCB layout and thermal management considerations remain unchanged.

Q: What is the significance of the Tape & Reel packaging format?

A: Tape & Reel (TR) packaging is the standard format for automated surface mount assembly. This format does not affect electrical performance or thermal characteristics. The change from the original packaging to Tape & Reel reflects current manufacturing and supply chain standards for surface mount components.

Q: Why is reverse leakage current lower in STPS745G-TR?

A: Reverse leakage current is a device-specific characteristic determined by semiconductor material quality and junction design. The STPS745G-TR exhibits 100 µA reverse leakage at 45 V compared to 800 µA for the 6TQ045STRR. Lower reverse leakage reduces power dissipation in reverse bias conditions and improves overall circuit efficiency, particularly in applications with sustained reverse voltage exposure.

Q: Are there any thermal management differences between these parts?

A: All parts use the same D2PAK package with identical thermal interface characteristics. Thermal performance depends on PCB layout, copper area, and thermal vias. The lower reverse leakage of STPS745G-TR may reduce junction temperature in reverse bias conditions. Forward voltage differences should be evaluated for their impact on forward conduction losses in the specific application.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected. These certifications ensure compliance with current environmental and hazardous substance regulations. The original 6TQ045STRR is RoHS non-compliant, making transition to a compliant substitute necessary for new production and regulatory adherence.

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