6TQ040 Schottky Diode Equivalent & Substitute Parts

Part Overview

The 6TQ040 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 6 A average rectified current in a through-hole TO-220AC package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage, current, and thermal operating parameters while accommodating packaging and mounting type variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	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 @ 40 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 6TQ040 is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 40 V
Current - Average Rectified (Io) rating must equal or exceed 6 A
Technology must be Schottky (fast recovery diode)
Operating temperature range must encompass the application requirements
Mounting type and package compatibility with circuit board design

Secondary Considerations:

Forward voltage (Vf) characteristics at rated current
Reverse leakage current at rated voltage
RoHS and REACH compliance status for regulatory requirements
Product status (active vs. obsolete) for long-term availability

Substitute parts are grouped into two categories: through-hole TO-220AC packages (direct mechanical replacement) and surface-mount alternatives (requiring board redesign). All listed substitutes meet or exceed the minimum electrical specifications of the 6TQ040.

Parameter Comparison

Parameter	6TQ040 (Main)	MBR545-BP	MBR545F-BP	STPS745D	DSS6-0045AS-TRL
Manufacturer	Vishay	Micro Commercial Co	Micro Commercial Co	STMicroelectronics	IXYS
Voltage - DC Reverse (Vr) (Max)	40 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 @ 40 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

Through-Hole TO-220AC Direct Replacements:

The MBR545-BP and MBR545F-BP from Micro Commercial Co are through-hole TO-220AC packages providing direct mechanical compatibility with the 6TQ040 footprint. Both parts are active products with established supply chains. The MBR545F-BP features an isolated tab variant (ITO-220AC) suitable for applications requiring electrical isolation from the mounting surface. Note that both MBR545 variants are rated for 5 A average rectified current, which is below the 6 A specification of the 6TQ040; applications requiring the full 6 A rating must use alternative parts.

The STPS745D from STMicroelectronics is a through-hole TO-220AC package rated for 7.5 A average rectified current, exceeding the 6 A requirement of the 6TQ040. This part provides current margin and is ROHS3 compliant. The STPS745D is suitable for applications where higher current capacity is beneficial or where thermal derating is a design consideration.

Surface-Mount Alternative:

The DSS6-0045AS-TRL from IXYS is a surface-mount TO-252-3 (DPAK) package rated for 6 A average rectified current, matching the 6TQ040 specification. This part is ROHS3 compliant and active. Surface-mount implementation requires circuit board redesign and is applicable to new designs or board revisions where surface-mount technology is preferred for thermal management or space constraints.

Compliance Considerations:

The 6TQ040 is RoHS non-compliant. For applications subject to RoHS3 requirements, the STPS745D and DSS6-0045AS-TRL are compliant alternatives. The MBR545 variants do not specify RoHS status and should be verified with the supplier for regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the MBR545-BP or MBR545F-BP be used as direct replacements for the 6TQ040?

A: Both parts are through-hole TO-220AC packages and are mechanically compatible with the 6TQ040 footprint. However, both are rated for 5 A average rectified current, which is 1 A below the 6TQ040 specification. They are suitable for applications operating at or below 5 A. For applications requiring the full 6 A rating, use the STPS745D or DSS6-0045AS-TRL.

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

A: Both parts are rated for 45 V and 5 A. The MBR545F-BP features an isolated tab (ITO-220AC package) compared to the standard TO-220AC of the MBR545-BP. The isolated tab variant electrically isolates the tab from the diode cathode, required in applications where the mounting surface must not be at cathode potential. The MBR545F-BP also has a lower maximum junction temperature of 150°C compared to 125°C for the MBR545-BP.

Q: Why is the STPS745D rated for 7.5 A when the 6TQ040 is only 6 A?

A: The STPS745D is a higher-current variant within the same package family. The 7.5 A rating provides design margin and thermal headroom for applications operating at 6 A. This part is suitable for direct replacement where higher current capacity is acceptable or beneficial.

Q: Is the DSS6-0045AS-TRL a suitable replacement if I must use surface-mount technology?

A: The DSS6-0045AS-TRL is rated for 6 A average rectified current and 45 V reverse voltage, matching the electrical specifications of the 6TQ040. However, it uses a TO-252-3 (DPAK) surface-mount package, requiring circuit board redesign. This part is suitable only for new designs or board revisions incorporating surface-mount technology.

Q: What are the compliance differences between the 6TQ040 and the substitute parts?

A: The 6TQ040 is RoHS non-compliant. The STPS745D and DSS6-0045AS-TRL are ROHS3 compliant. The MBR545-BP and MBR545F-BP do not specify RoHS status. For applications subject to RoHS3 regulatory requirements, use the STPS745D (through-hole) or DSS6-0045AS-TRL (surface-mount).

Q: Can I use the STPS745D in a circuit designed for the 6TQ040 without modification?

A: The STPS745D is a through-hole TO-220AC package with the same mechanical footprint as the 6TQ040. It can be used as a direct pin-compatible replacement. The higher 7.5 A current rating and 45 V voltage rating exceed the 6TQ040 specifications, making it electrically compatible with circuits designed for the 6TQ040.

Q: What is the operating temperature range difference between the 6TQ040 and substitute parts?

A: The 6TQ040 operates from -55°C to 175°C. The MBR545-BP operates from -55°C to 125°C (20°C lower maximum). The MBR545F-BP operates from -65°C to 150°C (25°C lower maximum). The STPS745D maximum is 175°C (matching the 6TQ040). The DSS6-0045AS-TRL operates from -55°C to 175°C (matching the 6TQ040). For applications requiring the full -55°C to 175°C range, use the STPS745D or DSS6-0045AS-TRL.

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