Equivalent & Substitute Parts for 10TQ045 Schottky Diode

Part Overview

The 10TQ045 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 10 A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design and procurement requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	10 A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	6 mA @ 45 V
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-55°C ~ 175°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitute parts for the 10TQ045 are selected based on the following critical parameters:

Voltage Rating: All substitutes maintain the 45 V DC reverse voltage specification, ensuring compatibility in circuits designed for this voltage class.

Current Rating: Substitute parts are grouped by average rectified current capacity. The DSS10-0045B and STPS1045D provide direct 10 A equivalence. The STPS1545D offers 15 A capacity for applications requiring higher current margin. The STPS745D provides 7.5 A capacity for lower-current applications.

Package and Mounting: All substitutes use the TO-220-2 package in TO-220AC supplier configuration, maintaining identical through-hole mounting compatibility.

Technology: All substitutes employ Schottky diode technology with fast recovery characteristics (≤ 500ns, > 200mA), matching the original part's switching performance.

Thermal Range: Operating temperature specifications vary among substitutes. The 10TQ045 operates to 175°C maximum junction temperature. Substitute parts from STMicroelectronics (STPS series) and IXYS (DSS10-0045B) maintain or exceed this thermal capability.

Compliance Status: The 10TQ045 is RoHS non-compliant. All active substitute parts are RoHS3 compliant, supporting modern procurement and environmental requirements.

Parameter Comparison

Parameter	10TQ045 (Vishay)	DSS10-0045B (IXYS)	STPS1045D (STMicroelectronics)	STPS1545D (STMicroelectronics)	STPS745D (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	10 A	10 A	10 A	15 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 10 A	510 mV @ 10 A	600 mV @ 10 A	840 mV @ 30 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)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	6 mA @ 45 V	5 mA @ 45 V	100 µA @ 45 V	200 µA @ 45 V	100 µA @ 45 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction (Max)	175°C	150°C	175°C	175°C	175°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (10 A Rating):

The DSS10-0045B (IXYS) and STPS1045D (STMicroelectronics) provide direct electrical equivalence to the 10TQ045 at the 10 A current rating. Both parts are active products with RoHS3 compliance. The STPS1045D offers superior availability (55,200 units in stock) compared to DSS10-0045B (1,014 units). The DSS10-0045B exhibits lower forward voltage (510 mV @ 10 A) relative to the original specification (760 mV @ 10 A), resulting in reduced power dissipation. The STPS1045D forward voltage (600 mV @ 10 A) provides intermediate performance. Both maintain the required 45 V voltage rating and fast recovery switching characteristics.

Higher Current Alternative (15 A Rating):

The STPS1545D is suitable for applications where current margin above 10 A is required. This part maintains 45 V voltage rating and fast recovery performance. Higher reverse leakage current (200 µA @ 45 V) and forward voltage (840 mV @ 30 A) must be evaluated against circuit requirements. Availability is substantial (35,200 units in stock).

Lower Current Alternative (7.5 A Rating):

The STPS745D accommodates applications with maximum current requirements below 10 A. This part maintains 45 V voltage rating and fast recovery characteristics. Availability is adequate (16,973 units in stock).

Thermal Consideration:

The DSS10-0045B operates to 150°C maximum junction temperature, which is 25°C below the original 10TQ045 specification. Applications requiring full 175°C thermal operation should select STPS1045D, STPS1545D, or STPS745D from STMicroelectronics.

Compliance Priority:

All substitute parts are RoHS3 compliant, addressing the non-compliant status of the obsolete 10TQ045. This compliance status is mandatory for new designs and procurement in regulated industries.

Frequently Asked Questions (FAQ)

Q: Can the DSS10-0045B directly replace the 10TQ045 in all applications?

A: The DSS10-0045B provides electrical equivalence at the 10 A current rating and 45 V voltage specification. However, the maximum operating temperature is 150°C versus 175°C for the original part. Applications operating near the upper thermal limit require verification against the DSS10-0045B thermal specification. The lower forward voltage (510 mV @ 10 A) reduces power dissipation, which is beneficial in most applications.

Q: What is the difference between STPS1045D and STPS1545D?

A: Both parts maintain the 45 V voltage rating and fast recovery switching. The primary difference is current rating: STPS1045D is rated for 10 A average rectified current, while STPS1545D is rated for 15 A. The STPS1545D exhibits higher reverse leakage current (200 µA @ 45 V versus 100 µA @ 45 V) and higher forward voltage at higher current levels (840 mV @ 30 A). Selection depends on the actual circuit current requirement and acceptable power dissipation.

Q: Are all substitute parts available in the same TO-220AC package?

A: Yes. All substitute parts use the TO-220-2 package in TO-220AC supplier configuration, maintaining identical through-hole mounting compatibility with the original 10TQ045. No PCB layout modifications are required.

Q: Why does the 10TQ045 show higher reverse leakage current (6 mA @ 45 V) compared to some substitutes?

A: The 10TQ045 reverse leakage specification (6 mA @ 45 V) is higher than the DSS10-0045B (5 mA @ 45 V) and lower than the STMicroelectronics parts (100-200 µA @ 45 V). Reverse leakage current varies with manufacturing process and die design. Lower reverse leakage in modern parts reduces standby power consumption and improves circuit efficiency.

Q: Which substitute part has the best availability?

A: The STPS1045D from STMicroelectronics has the highest inventory (55,200 units in stock), followed by STPS1545D (35,200 units) and STPS745D (16,973 units). The DSS10-0045B has lower availability (1,014 units). For procurement planning, STPS1045D is the most readily available direct equivalent.

Q: Can I use STPS745D if my circuit only requires 7.5 A?

A: Yes. The STPS745D is suitable for applications with maximum current requirements of 7.5 A or less. It maintains the 45 V voltage rating, fast recovery characteristics, and RoHS3 compliance. This selection reduces component cost and thermal dissipation compared to higher-rated alternatives.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage differences affect power dissipation and voltage drop across the diode. The DSS10-0045B (510 mV @ 10 A) dissipates less power than the original 10TQ045 (760 mV @ 10 A). The STPS1045D (600 mV @ 10 A) provides intermediate performance. In high-current applications, lower forward voltage reduces heat generation and improves efficiency. Circuit design must account for the voltage drop in rectification and power supply calculations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are RoHS3 compliant. The original 10TQ045 is RoHS non-compliant. This compliance status is required for new designs and procurement in regulated markets and industries with environmental requirements.

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