VS-12CTQ040PBF Equivalent & Substitute Parts

Part Overview

The VS-12CTQ040PBF is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 40 V DC reverse voltage and 6 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 form factor and is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io) (per Diode)	6 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 40 V
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the VS-12CTQ040PBF are classified based on electrical and mechanical parameter alignment within the Schottky diode array category. Substitution eligibility is determined by the following criteria:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-3 or compatible variant
Operating Temperature Range: Minimum -55°C to 175°C

Electrical Parameter Tolerance:

Voltage - DC Reverse (Vr): Equal to or greater than 40 V
Current - Average Rectified (Io): Equal to or greater than 6 A per diode
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Parts meeting these criteria are classified as direct equivalents or parametric equivalents. Parts exceeding the electrical specifications while maintaining the same configuration and package are classified as manufacturer-recommended substitutes with enhanced performance margins.

Parameter Comparison

Parameter	VS-12CTQ040PBF (Main)	VS-12CTQ040-M3 (Direct Equivalent)	STPS1545CT (MFR Recommended)	12CTQ040 (Parametric Equivalent)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	STMicroelectronics	SMC Diode Solutions
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	45 V	40 V
Current - Average Rectified (Io) (per Diode)	6 A	6 A	7.5 A	6 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	730 mV @ 12 A	570 mV @ 7.5 A	600 mV @ 6 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	800 µA @ 40 V	800 µA @ 40 V	100 µA @ 45 V	800 µA @ 40 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	175°C (Max)	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VS-12CTQ040-M3 (Direct Equivalent - Vishay General Semiconductor)

The VS-12CTQ040-M3 is the direct equivalent to the VS-12CTQ040PBF. Both components share identical electrical specifications, configuration, and package format. The VS-12CTQ040-M3 maintains active product status and is available in higher inventory quantities (1023 pcs). This part is the primary substitute for direct replacement applications. The packaging format differs (Tube vs. unspecified for main part), but electrical and mechanical compatibility is complete. RoHS3 compliance and MSL 1 rating are maintained.

STPS1545CT (Manufacturer-Recommended Substitute - STMicroelectronics)

The STPS1545CT is a manufacturer-recommended substitute offering enhanced electrical specifications. This component provides 45 V DC reverse voltage (5 V higher than the main part) and 7.5 A average rectified current (1.5 A higher per diode). The forward voltage is lower at 570 mV @ 7.5 A, and reverse leakage current is significantly reduced to 100 µA @ 45 V. The STPS1545CT is suitable for applications requiring improved performance margins or operating in higher voltage environments. Active product status and full compliance certifications are maintained. The operating temperature maximum specification differs (175°C max vs. -55°C to 175°C range for the main part).

12CTQ040 (Parametric Equivalent - SMC Diode Solutions)

The 12CTQ040 from SMC Diode Solutions is a parametric equivalent matching the electrical specifications of the VS-12CTQ040PBF. This component provides identical voltage, current, and thermal ratings. The package variant is TO-220AB rather than TO-220-3, which maintains mechanical compatibility for Through Hole mounting applications. This part offers the highest inventory availability (5900 pcs) and active product status. REACH Status differs (Affected vs. Unaffected), which may impact supply chain considerations in certain regulatory jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can the VS-12CTQ040-M3 be used as a direct replacement for the VS-12CTQ040PBF?

A: Yes. The VS-12CTQ040-M3 is a direct equivalent with identical electrical specifications, diode configuration, and TO-220-3 package format. Both components are rated for 40 V DC reverse voltage and 6 A average rectified current per diode. The primary difference is product status (Active vs. Discontinued) and packaging format (Tube).

Q: What are the key differences between the STPS1545CT and the VS-12CTQ040PBF?

A: The STPS1545CT provides enhanced electrical specifications: 45 V DC reverse voltage (vs. 40 V), 7.5 A average rectified current (vs. 6 A), and lower forward voltage at 570 mV @ 7.5 A (vs. 600 mV @ 6 A). Reverse leakage current is also reduced to 100 µA @ 45 V. These improvements provide greater performance margins for applications operating near the original part's electrical limits.

Q: Are all substitute parts compatible with the same PCB layout?

A: All substitute parts use Through Hole mounting in TO-220-3 or compatible TO-220 package variants. Physical pin configuration and spacing are compatible with standard TO-220-3 PCB layouts. The 12CTQ040 uses a TO-220AB variant, which maintains mechanical compatibility with TO-220-3 footprints.

Q: What is the significance of the different forward voltage specifications?

A: Forward voltage specifications are measured at different current levels. The VS-12CTQ040PBF specifies 600 mV @ 6 A, the VS-12CTQ040-M3 specifies 730 mV @ 12 A, and the STPS1545CT specifies 570 mV @ 7.5 A. These measurements reflect device behavior at their respective rated currents and are not directly comparable without accounting for the measurement conditions.

Q: Which substitute part should be selected for new designs?

A: For new designs, the VS-12CTQ040-M3 or STPS1545CT are recommended based on active product status. The STPS1545CT is suitable if enhanced performance margins are required. The 12CTQ040 offers maximum inventory availability and is suitable for applications with standard performance requirements.

Q: Are there any compliance or regulatory differences between the substitute parts?

A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) ratings. The 12CTQ040 has REACH Status Affected, while the VS-12CTQ040-M3 and STPS1545CT have REACH Status Unaffected. Applications subject to REACH regulations should account for this distinction.

Q: Can the STPS1545CT be used in applications designed for the VS-12CTQ040PBF?

A: Yes. The STPS1545CT exceeds the electrical specifications of the VS-12CTQ040PBF and is electrically compatible. The higher voltage and current ratings provide additional safety margins. The reduced forward voltage and reverse leakage current may improve circuit efficiency and reduce heat generation.

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