VS-12TQ035PBF Equivalent & Substitute Parts

Part Overview

The VS-12TQ035PBF is a Schottky rectifier diode rated for 35 V DC reverse voltage and 15 A average rectified current in a TO-220AC through-hole package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part remains available in inventory but is no longer actively supported through primary distribution channels.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	35 V
Current - Average Rectified (Io)	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1.75 mA @ 35 V
Package / Case	TO-220-2
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the VS-12TQ035PBF is determined by the following critical parameters:

Mandatory Matching Parameters:

Technology: Schottky rectifier diode
Package / Case: TO-220-2 (TO-220AC supplier package)
Mounting Type: Through Hole
Current - Average Rectified (Io): 15 A minimum
Voltage - DC Reverse (Vr) (Max): 35 V minimum

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Forward voltage may vary within application tolerance
Current - Reverse Leakage @ Vr: Leakage current may vary
Operating Temperature - Junction (Max): May exceed 150°C
RoHS Status: Active parts must maintain ROHS3 compliance

Substitute parts must maintain identical current rating and equal or greater reverse voltage rating. Package and mounting type must remain unchanged to ensure mechanical and electrical compatibility in existing circuit board designs.

Parameter Comparison

Parameter	VS-12TQ035PBF	VS-12TQ035-M3	12TQ035	STPS1545D
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	35 V	45 V
Current - Average Rectified (Io)	15 A	15 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	710 mV @ 30 A	560 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	1.75 mA @ 35 V	1.75 mA @ 35 V	200 µA @ 45 V
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
Product Status	Discontinued at DiGi Electronics	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Inventory Status	1081 Pcs New Original In Stock	1062 Pcs New Original In Stock	5100 Pcs New Original In Stock	35200 Pcs New Original In Stock

Engineering Selection Recommendations

VS-12TQ035-M3 (Vishay General Semiconductor - Diodes Division)

The VS-12TQ035-M3 is the direct equivalent substitute for the VS-12TQ035PBF. Both parts share identical electrical specifications for voltage rating (35 V), current rating (15 A), package type (TO-220-2), and mounting configuration (Through Hole). The VS-12TQ035-M3 maintains ROHS3 compliance and is currently in active product status with adequate inventory availability. This part is the primary selection for direct replacement in new designs and production continuity.

12TQ035 (Vishay General Semiconductor - Diodes Division)

The 12TQ035 is the base product number for the VS-12TQ035PBF series and shares identical electrical parameters. However, this part is classified as obsolete and does not maintain ROHS3 compliance. Selection of this part is limited to legacy applications where RoHS compliance is not required and existing inventory must be utilized.

STPS1545D (STMicroelectronics)

The STPS1545D is a manufacturer-recommended substitute from an alternative supplier. This part maintains the 15 A current rating and TO-220-2 package configuration but provides a higher reverse voltage rating of 45 V compared to the 35 V specification of the VS-12TQ035PBF. The STPS1545D is ROHS3 compliant, actively produced, and available in high inventory quantities. This part is suitable for applications where the higher voltage rating provides design margin or where supply chain diversification is required. Forward voltage and reverse leakage characteristics differ from the original part and must be evaluated for circuit performance impact.

Frequently Asked Questions (FAQ)

Q: Can the VS-12TQ035-M3 be used as a direct replacement for the VS-12TQ035PBF?

A: Yes. The VS-12TQ035-M3 is electrically and mechanically equivalent to the VS-12TQ035PBF. Both parts have identical voltage ratings (35 V), current ratings (15 A), package types (TO-220-2), and mounting configurations (Through Hole). The primary difference is product status and packaging format. No circuit modifications are required.

Q: What is the difference between the VS-12TQ035PBF and VS-12TQ035-M3?

A: The VS-12TQ035PBF is discontinued at DiGi Electronics, while the VS-12TQ035-M3 is in active production status. The VS-12TQ035-M3 is supplied in tube packaging, whereas the VS-12TQ035PBF packaging format is not specified. Both parts are ROHS3 compliant and share identical electrical specifications.

Q: Can the STPS1545D replace the VS-12TQ035PBF in all applications?

A: The STPS1545D maintains mechanical compatibility (TO-220-2 package, Through Hole mounting) and current rating (15 A) but has a higher reverse voltage rating (45 V versus 35 V). Forward voltage and reverse leakage characteristics differ. The STPS1545D is suitable for applications where the higher voltage rating is acceptable and forward voltage variation does not impact circuit performance. Circuit-level evaluation is required for applications with tight voltage or leakage specifications.

Q: Why is the 12TQ035 not recommended as a substitute?

A: The 12TQ035 is classified as obsolete and does not maintain ROHS3 compliance. While electrically equivalent to the VS-12TQ035PBF, this part is not suitable for new designs or applications requiring RoHS compliance. Use of this part is limited to legacy systems where compliance requirements do not apply.

Q: Are all substitute parts available in the same package format?

A: All substitute parts use the TO-220-2 package case and TO-220AC supplier package designation. Mounting type is Through Hole for all parts. Packaging format (tube, tape, or bulk) may vary between suppliers and product status classifications. Verify packaging requirements with your procurement specification.

Q: What is the maximum operating temperature for each substitute part?

A: The VS-12TQ035PBF and VS-12TQ035-M3 have a maximum junction operating temperature of 150°C. The STPS1545D has a maximum junction operating temperature of 175°C. The 12TQ035 has a maximum junction operating temperature of 150°C. Applications requiring operation above 150°C must use the STPS1545D.

Q: Do all substitute parts maintain RoHS compliance?

A: The VS-12TQ035-M3 and STPS1545D are ROHS3 compliant. The 12TQ035 is RoHS non-compliant. For applications requiring RoHS compliance, use either the VS-12TQ035-M3 or STPS1545D.

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