Equivalent & Substitute Parts for 6TQ045

Part Overview

The 6TQ045 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 through-hole TO-220AC package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement continuity. The 6TQ045 operates across a junction temperature range of -55°C to 175°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

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	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the 6TQ045 is determined by the following critical parameters: voltage rating (45 V DC reverse), current rating (6 A average rectified), technology (Schottky), and mounting type (through-hole TO-220AC package). Substitute parts must maintain electrical equivalence within the specified voltage and current ranges while preserving the through-hole form factor for direct circuit board compatibility.

The substitute parts are grouped into two categories:

Category 1: Through-Hole Equivalents (Same Mounting Type) Parts MBR545-BP, MBR545F-BP, and STPS745D maintain the through-hole TO-220AC mounting configuration, enabling direct replacement without PCB redesign. These parts satisfy the 45 V voltage requirement and provide current ratings at or above the 6 A specification.

Category 2: Surface-Mount Alternative (Different Mounting Type) Part DSS6-0045AS-TRL provides electrical equivalence in a surface-mount TO-252AA package. This part is suitable only for applications where PCB layout permits surface-mount technology and where the mounting transition is acceptable.

Parameter Comparison

Parameter	6TQ045 (Main)	MBR545-BP	MBR545F-BP	STPS745D	DSS6-0045AS-TRL
Manufacturer	Vishay	Micro Commercial Co	Micro Commercial Co	STMicroelectronics	IXYS
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	6 A	5 A	5 A	7.5 A	6 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	600 mV @ 5 A	550 mV @ 5 A	840 mV @ 15 A	630 mV @ 6 A
Speed	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	800 µA @ 45 V	100 µA @ 45 V	1 mA @ 45 V	100 µA @ 45 V	300 µA @ 45 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	TO-220-2	TO-220-2	TO-220-2 Isolated Tab	TO-220-2	TO-252-3, DPAK
Operating Temperature - Junction	-55 to 175°C	-55 to 125°C	-65 to 150°C	Max 175°C	-55 to 175°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Through-Hole Replacement:

MBR545-BP and MBR545F-BP are active products suitable for direct substitution in through-hole applications. Both parts maintain the 45 V voltage rating and TO-220AC package configuration. MBR545-BP operates to 125°C maximum junction temperature, while MBR545F-BP extends to 150°C and features an isolated tab variant (ITO-220AC). The MBR545F-BP exhibits lower forward voltage (550 mV @ 5 A) compared to the 6TQ045 (600 mV @ 6 A), resulting in reduced power dissipation. Both parts carry current ratings of 5 A, which is lower than the 6 A specification of the 6TQ045; circuit thermal analysis is required to confirm adequacy in applications demanding the full 6 A rating.

STPS745D is an active product offering higher current capacity (7.5 A) within the same 45 V voltage class and through-hole TO-220AC package. This part provides margin above the 6 A requirement and is suitable for applications where increased current headroom is beneficial. The STPS745D achieves ROHS3 compliance and maintains fast recovery characteristics.

For Surface-Mount Applications:

DSS6-0045AS-TRL is an active IXYS product providing exact electrical equivalence (45 V, 6 A) in a surface-mount TO-252AA package. This part is ROHS3 compliant and suitable for new designs or redesigns incorporating surface-mount technology. The DSS6-0045AS-TRL is not a direct replacement for through-hole applications without PCB layout modification.

Compliance Considerations:

The 6TQ045 is RoHS non-compliant. STPS745D and DSS6-0045AS-TRL are ROHS3 compliant, making these parts suitable for applications subject to RoHS regulations. All substitute parts carry REACH Unaffected status, consistent with the main part.

Frequently Asked Questions (FAQ)

Q: Can MBR545-BP or MBR545F-BP directly replace the 6TQ045 in all applications?

A: Both parts maintain the 45 V voltage rating and through-hole TO-220AC package, enabling physical and electrical compatibility. However, both parts are rated for 5 A average rectified current, compared to the 6 A rating of the 6TQ045. Applications operating at or near 6 A require thermal analysis to confirm that the lower current rating does not exceed junction temperature limits under worst-case conditions.

Q: What is the difference between MBR545-BP and MBR545F-BP?

A: Both parts share the same 45 V voltage and 5 A current ratings. MBR545F-BP features an isolated tab variant (ITO-220AC package) and extends the maximum junction temperature to 150°C compared to 125°C for MBR545-BP. MBR545F-BP also exhibits lower forward voltage (550 mV @ 5 A versus 600 mV @ 5 A), reducing power dissipation.

Q: Is STPS745D a suitable replacement for the 6TQ045?

A: Yes. STPS745D maintains the 45 V voltage rating and through-hole TO-220AC package. The 7.5 A current rating exceeds the 6 A requirement, providing operational margin. STPS745D is ROHS3 compliant and active in production, making it suitable for new designs and legacy system support.

Q: Can DSS6-0045AS-TRL replace the 6TQ045?

A: DSS6-0045AS-TRL provides exact electrical equivalence (45 V, 6 A) and is ROHS3 compliant. However, this part uses surface-mount TO-252AA packaging instead of through-hole TO-220AC. Direct replacement requires PCB redesign. DSS6-0045AS-TRL is suitable for new surface-mount designs or applications where PCB layout modification is acceptable.

Q: What are the key differences in reverse leakage current among the substitute parts?

A: The 6TQ045 exhibits 800 µA reverse leakage at 45 V. MBR545-BP and STPS745D both show 100 µA, representing significantly lower leakage. MBR545F-BP shows 1 mA, higher than the original part. DSS6-0045AS-TRL exhibits 300 µA. Lower reverse leakage reduces standby power consumption and heat generation in applications with sustained reverse bias.

Q: Are all substitute parts available in the same packaging options?

A: MBR545-BP, MBR545F-BP, and STPS745D are all through-hole TO-220AC packages, maintaining form factor compatibility with the 6TQ045. MBR545F-BP offers an isolated tab variant (ITO-220AC) for applications requiring electrical isolation between the tab and case. DSS6-0045AS-TRL is surface-mount only (TO-252AA, DPAK), requiring different PCB footprint and assembly process.

Q: Which substitute part offers the best compliance profile?

A: Both STPS745D and DSS6-0045AS-TRL are ROHS3 compliant, meeting modern regulatory requirements. The 6TQ045 is RoHS non-compliant. All parts carry REACH Unaffected status. For applications subject to RoHS regulations, STPS745D is recommended for through-hole applications and DSS6-0045AS-TRL for surface-mount applications.

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