Equivalent & Substitute Parts for 10TQ040 Schottky Diode

Part Overview

The 10TQ040 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 10 A average rectified current in a Through Hole TO-220AC package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a junction temperature range of -55°C to 175°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Substiute Parts

10TQ040

Vishay General Semiconductor - Diodes DivisionIn Stock: 128210TQ040 Datasheet

Current PartRFQ

DSS10-0045B

IXYSIn Stock: 1060DSS10-0045B Datasheet

MFR RecommendedRFQ

STPS1045D

STMicroelectronicsIn Stock: 55269STPS1045D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 10TQ040 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Technology: Schottky diode
• Mounting Type: Through Hole
• Package / Case: TO-220-2 (TO-220AC supplier package)
• Current - Average Rectified (Io): 10 A minimum
• Voltage - DC Reverse (Vr) (Max): 40 V minimum (higher ratings are acceptable)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation:

• Voltage - DC Reverse (Vr) (Max): Substitute parts rated at 45 V exceed the 40 V requirement and are electrically compatible
• Voltage - Forward (Vf) (Max) @ If: Variations within the Schottky diode technology range are acceptable
• Current - Reverse Leakage @ Vr: Variations are acceptable provided the diode meets fast recovery specifications
• Operating Temperature - Junction: Minimum operating range must support -55°C to 175°C or equivalent thermal envelope

The substitute parts DSS10-0045B and STPS1045D both meet these criteria with 45 V reverse voltage ratings, 10 A current capacity, TO-220AC packaging, and fast recovery characteristics.

Parameter Comparison

Engineering Selection Recommendations

DSS10-0045B (IXYS): This substitute is electrically compatible with the 10TQ040, offering a 45 V reverse voltage rating that exceeds the original 40 V specification. The DSS10-0045B maintains 10 A current capacity and fast recovery characteristics. The part is in active production status with ROHS3 compliance, making it suitable for new designs requiring regulatory adherence. The forward voltage of 510 mV @ 10 A is lower than the original part, resulting in reduced power dissipation. The maximum junction temperature of 150°C is lower than the original 175°C specification; applications requiring operation at the upper thermal limit of the 10TQ040 should account for this difference.

STPS1045D (STMicroelectronics): This substitute provides electrical compatibility with the 10TQ040 through matching 10 A current capacity, fast recovery characteristics, and TO-220AC packaging. The 45 V reverse voltage rating exceeds the original 40 V requirement. The STPS1045D is in active production with ROHS3 compliance and extensive inventory availability (55,200 pieces). The forward voltage of 600 mV @ 10 A falls between the original part and the IXYS alternative. The maximum junction temperature of 175°C matches the original specification, providing thermal equivalence across the full operating range.

Both substitute parts are qualified for direct replacement based on electrical parameters, package compatibility, and active production status. Selection between DSS10-0045B and STPS1045D depends on thermal requirements and forward voltage characteristics specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the DSS10-0045B or STPS1045D be used as direct replacements for the 10TQ040?

A: Both parts are electrically and mechanically compatible with the 10TQ040. They share identical current ratings (10 A), fast recovery characteristics, and TO-220AC packaging. The higher reverse voltage ratings (45 V vs. 40 V) provide additional design margin. Thermal operating ranges differ slightly; the STPS1045D matches the original 175°C maximum junction temperature, while the DSS10-0045B is rated to 150°C maximum.

Q: What is the significance of the higher 45 V reverse voltage rating on the substitute parts?

A: The substitute parts are rated for 45 V reverse voltage compared to the original 40 V specification. This higher rating is electrically compatible and provides additional safety margin in applications operating near the maximum reverse voltage. No circuit modifications are required when substituting to a higher voltage-rated diode.

Q: How do the forward voltage differences affect circuit performance?

A: The DSS10-0045B exhibits 510 mV forward voltage at 10 A, the STPS1045D exhibits 600 mV, and the original 10TQ040 exhibits 760 mV. Lower forward voltage results in reduced power dissipation and heat generation. Circuit designs should account for these differences in thermal management calculations, though the substitutes generally provide improved efficiency.

Q: Are there compliance differences between the original part and substitutes?

A: The original 10TQ040 is RoHS non-compliant. Both substitute parts (DSS10-0045B and STPS1045D) are ROHS3 compliant, making them suitable for applications requiring regulatory adherence. All three parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: What is the impact of the DSS10-0045B's lower maximum junction temperature?

A: The DSS10-0045B is rated to 150°C maximum junction temperature compared to the original 175°C and the STPS1045D's 175°C. Applications requiring sustained operation at temperatures above 150°C should use the STPS1045D to maintain full thermal margin. For applications operating below 150°C, the DSS10-0045B is fully compatible.

Q: Are the substitute parts available in the same packaging format?

A: Yes. All three parts use TO-220-2 package / case designation with TO-220AC supplier device package. The Through Hole mounting type is identical, allowing direct PCB footprint compatibility without layout modifications.

Q: How do reverse leakage currents compare between the parts?

A: The original 10TQ040 exhibits 6 mA reverse leakage at 40 V. The DSS10-0045B exhibits 5 mA at 45 V, and the STPS1045D exhibits 100 µA at 45 V. Lower reverse leakage reduces standby power consumption. The STPS1045D's significantly lower leakage current may provide advantages in low-power or precision applications.