Equivalent & Substitute Parts for Vishay 12TQ035 Schottky Diode

Part Overview

The Vishay 12TQ035 is a Schottky rectifier diode rated for 35V DC reverse voltage and 15A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 12TQ035 features fast recovery characteristics suitable for high-frequency rectification applications with a maximum forward voltage of 560 mV at 15A operation.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1.75	mA @ 35 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the Vishay 12TQ035 is determined by the following critical parameters: voltage rating (DC reverse voltage), current rating (average rectified current), package type (TO-220AC), mounting configuration (through-hole), and recovery speed classification (fast recovery). Substitute parts must maintain electrical compatibility within the application's voltage and current requirements while preserving the same physical form factor and thermal characteristics.

The substitute parts identified fall into two categories based on electrical specifications:

Category 1: Direct Current Rating Match (15A) Parts maintaining the 15A current specification with equal or higher voltage ratings and compatible forward voltage characteristics.

Category 2: Reduced Current Rating (7.5A) Parts with lower current capacity suitable for applications not requiring full 15A capability but maintaining voltage compatibility.

All substitute parts listed operate within the same temperature range and employ fast recovery Schottky technology. Package compatibility (TO-220-2 / TO-220AC) is maintained across all alternatives, ensuring mechanical interchangeability in through-hole PCB designs.

Parameter Comparison

Parameter	12TQ035 (Vishay)	DSS16-0045B (IXYS)	MBR735HC0G (TSC)	STPS1545D (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	35 V	45 V	35 V	45 V
Current - Average Rectified (Io)	15 A	16 A	7.5 A	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	480 mV @ 15 A	840 mV @ 15 A	840 mV @ 30 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	1.75 mA @ 35 V	10 mA @ 45 V	100 µA @ 35 V	200 µA @ 45 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	Max 175°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STPS1545D (STMicroelectronics) is the primary substitute for the Vishay 12TQ035. This part maintains the 15A current rating and provides a 45V voltage rating, offering enhanced voltage margin over the original specification. The STPS1545D is in active production status with ROHS3 compliance and extensive inventory availability (35,200 units). The higher maximum junction temperature rating (175°C) provides additional thermal headroom. This part is explicitly listed as a substitute in the original 12TQ035 documentation.

DSS16-0045B (IXYS) serves as an alternative with 16A current capacity and 45V voltage rating. This part offers improved current handling and voltage margin with lower forward voltage (480 mV @ 15A) compared to the original specification. ROHS3 compliance and active production status support long-term availability. The DSS16-0045B is suitable for applications requiring enhanced performance margins.

MBR735HC0G (Taiwan Semiconductor Corporation) is applicable only for applications where the 15A current requirement can be reduced to 7.5A. This part maintains the 35V voltage rating and includes AEC-Q101 automotive qualification. The higher forward voltage (840 mV @ 15A) and lower reverse leakage current (100 µA @ 35V) make this option suitable for automotive and high-reliability applications requiring reduced current capacity.

All substitute parts maintain TO-220-2 package compatibility, fast recovery Schottky technology, and through-hole mounting configuration. Selection should be based on specific application voltage and current requirements, compliance mandates, and thermal design constraints.

Frequently Asked Questions (FAQ)

Q: Can the STPS1545D directly replace the Vishay 12TQ035 in all applications?

A: The STPS1545D maintains electrical compatibility for applications operating at or below 35V and 15A specifications. The higher voltage rating (45V) and improved thermal characteristics (175°C max junction temperature) provide design margin. Physical package compatibility (TO-220-2) ensures mechanical interchangeability in through-hole PCB layouts. Verify application-specific requirements for forward voltage characteristics and reverse leakage performance.

Q: What is the difference between the DSS16-0045B and STPS1545D substitutes?

A: Both parts provide 45V voltage rating and 15A+ current capacity. The DSS16-0045B offers 16A current rating with lower forward voltage (480 mV @ 15A), while the STPS1545D maintains 15A rating with higher forward voltage (840 mV @ 30A). The STPS1545D provides higher inventory availability and extended temperature rating. Selection depends on thermal dissipation requirements and current margin needs.

Q: Why is the MBR735HC0G listed as a substitute if it has only 7.5A current rating?

A: The MBR735HC0G is applicable for circuit designs where the full 15A current capacity is not required. This part maintains the 35V voltage rating and offers automotive-grade qualification (AEC-Q101). The lower reverse leakage current (100 µA @ 35V) and reduced forward voltage characteristics make it suitable for specific application profiles requiring lower current handling.

Q: Are all substitute parts RoHS compliant?

A: Yes. The STPS1545D, DSS16-0045B, and MBR735HC0G are all ROHS3 compliant. The original Vishay 12TQ035 is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: What are the thermal considerations when selecting a substitute?

A: The STPS1545D provides the highest maximum junction temperature (175°C) compared to the original 12TQ035 (150°C) and other substitutes (150°C). Forward voltage characteristics vary across substitutes: STPS1545D and MBR735HC0G exhibit higher forward voltage (840 mV) than the original (560 mV), resulting in increased power dissipation. DSS16-0045B offers the lowest forward voltage (480 mV @ 15A), reducing thermal load. Thermal design calculations should account for these differences in power dissipation.

Q: Is the TO-220AC package identical across all parts?

A: All listed parts use TO-220-2 package configuration with TO-220AC supplier designation, ensuring mechanical and thermal compatibility in through-hole PCB designs. Pin configuration and lead spacing are identical, supporting direct physical substitution without PCB layout modifications.

Q: What inventory considerations apply to these substitutes?

A: The STPS1545D offers the highest inventory availability (35,200 units), followed by DSS16-0045B (1,092 units) and MBR735HC0G (834 units). The original 12TQ035 has 5,100 units in stock but is obsolete. For long-term production requirements, the STPS1545D provides the most reliable supply continuity.

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