Equivalent & Substitute Parts for 30CTQ040 Schottky Diode Array

Part Overview

The 30CTQ040 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 40 V DC reverse voltage and 15 A average rectified current per diode. This component is packaged in TO-220-3 through-hole configuration and features fast recovery characteristics suitable for switching applications.

The 30CTQ040 has reached obsolete product status. Equivalent and substitute parts are available from active manufacturers including STMicroelectronics, onsemi, and SMC Diode Solutions. These alternatives maintain functional compatibility while offering improved availability, compliance certifications, and in some cases enhanced electrical performance characteristics.

Substiute Parts

30CTQ040

Vishay General Semiconductor - Diodes DivisionIn Stock: 224330CTQ040 Datasheet

Current PartRFQ

MBR2545CTG

onsemiIn Stock: 15334MBR2545CTG Datasheet

MFR RecommendedRFQ

STPS2545CT

STMicroelectronicsIn Stock: 3356STPS2545CT Datasheet

MFR RecommendedRFQ

STPS3045CT

STMicroelectronicsIn Stock: 38456STPS3045CT Datasheet

MFR RecommendedRFQ

STPS30L45CT

STMicroelectronicsIn Stock: 5424STPS30L45CT Datasheet

MFR RecommendedRFQ

30CTQ040

SMC Diode SolutionsIn Stock: 228630CTQ040 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 30CTQ040 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode (mandatory)
• Technology: Schottky (mandatory)
• Mounting Type: Through Hole (mandatory)
• Package / Case: TO-220-3 (mandatory)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory)

Electrical Performance Criteria:

• Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 40 V
• Current - Average Rectified (Io) (per Diode): Substitute must equal or exceed 15 A
• Voltage - Forward (Vf) (Max) @ If: Substitute must not exceed 620 mV @ rated current
• Current - Reverse Leakage @ Vr: Substitute must not exceed 2 mA @ rated voltage

Substitute parts are grouped into two categories:

Category 1: Manufacturer Recommended Substitutes (MFR Recommended) Parts that exceed the 30CTQ040 specifications in voltage rating (45 V) while maintaining or improving current capacity and forward voltage characteristics. These parts are from active manufacturers with current product status and RoHS3 compliance.

Category 2: Parametric Equivalent (Exact Match) Parts that match the 30CTQ040 specifications identically, sourced from alternative manufacturers with improved compliance certifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent):

The 30CTQ040 manufactured by SMC Diode Solutions is a parametric equivalent offering identical electrical specifications to the original Vishay part. This option maintains the 40 V reverse voltage rating and 15 A current capacity with matching forward voltage characteristics. The SMC variant provides ROHS3 compliance and active product status, addressing the obsolescence of the original Vishay component while preserving all electrical performance parameters.

For Upgraded Performance (Manufacturer Recommended Substitutes):

The STPS3045CT from STMicroelectronics provides a direct functional upgrade with increased voltage rating (45 V), maintained current capacity (15 A), and improved forward voltage performance (570 mV @ 15 A versus 620 mV). This part offers the highest maximum junction temperature rating (200°C) and the largest inventory availability (38,369 units). ROHS3 compliance and active product status ensure long-term supply continuity.

The MBR2545CTG from onsemi matches the 30CTQ040 electrical specifications exactly (40 V equivalent performance at 45 V rating, 15 A, 620 mV forward voltage) while providing ROHS3 compliance and extended temperature range (-65°C to 175°C). This part is suitable for applications requiring the original performance envelope with improved compliance certifications.

The STPS30L45CT from STMicroelectronics offers the lowest forward voltage (550 mV @ 15 A) among available substitutes, providing improved efficiency in switching applications. This part is appropriate for designs where forward voltage loss is a critical performance factor.

For Current-Limited Applications:

The STPS2545CT from STMicroelectronics is suitable for applications where the 30CTQ040 is operated below 12.5 A. This part provides improved forward voltage characteristics (570 mV @ 12.5 A) and ROHS3 compliance. This option is not suitable for applications requiring the full 15 A current capacity.

Compliance Considerations:

All substitute parts except the original Vishay 30CTQ040 are ROHS3 compliant. The SMC Diode Solutions 30CTQ040 variant is REACH Affected, while all STMicroelectronics and onsemi parts are REACH Unaffected. Selection should account for end-product compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the STPS3045CT replace the 30CTQ040 in all applications?

A: The STPS3045CT is functionally compatible with the 30CTQ040 for all applications operating at or below 40 V. The higher voltage rating (45 V) provides additional design margin. The improved forward voltage (570 mV versus 620 mV) reduces power dissipation. The higher maximum junction temperature (200°C versus 175°C) extends thermal operating range. No circuit modifications are required for substitution.

Q: What is the difference between the MBR2545CTG and STPS3045CT?

A: Both parts are rated for 45 V and 15 A. The MBR2545CTG maintains the original forward voltage specification (620 mV @ 15 A) and provides extended low-temperature operation (-65°C). The STPS3045CT offers improved forward voltage (570 mV @ 15 A) and higher maximum junction temperature (200°C). Selection depends on whether forward voltage reduction or extended temperature range is prioritized.

Q: Is the SMC Diode Solutions 30CTQ040 identical to the Vishay original?

A: The SMC Diode Solutions 30CTQ040 matches all electrical specifications of the Vishay original: 40 V reverse voltage, 15 A current, 620 mV forward voltage, and identical temperature range (-55°C to 175°C). The primary differences are manufacturer identity, active product status, and ROHS3 compliance. Packaging is TO-220-3 in both cases.

Q: Why does the STPS2545CT have lower current rating (12.5 A versus 15 A)?

A: The STPS2545CT is rated for 12.5 A average rectified current per diode. This part is suitable only for applications where the 30CTQ040 operates below 12.5 A. For applications requiring the full 15 A capacity, the STPS3045CT, MBR2545CTG, or STPS30L45CT must be selected.

Q: What is the significance of the forward voltage differences among substitutes?

A: Forward voltage directly affects power dissipation in the diode. The STPS30L45CT (550 mV @ 15 A) dissipates less power than the 30CTQ040 (620 mV @ 15 A). The STPS3045CT (570 mV @ 15 A) provides intermediate performance. Lower forward voltage reduces thermal load and improves overall circuit efficiency. Selection should account for thermal design requirements.

Q: Are all substitute parts available in the same TO-220-3 package?

A: All substitute parts are packaged in TO-220-3 through-hole configuration, maintaining mechanical and thermal compatibility with the 30CTQ040. Pinout and mounting footprint are identical across all listed substitutes.

Q: What is the impact of reverse leakage current differences?

A: The 30CTQ040 specifies 2 mA reverse leakage @ 40 V. Substitute parts rated at 45 V show lower leakage at their rated voltage: MBR2545CTG and STPS3045CT at 200 µA @ 45 V, STPS2545CT at 125 µA @ 45 V, and STPS30L45CT at 400 µA @ 45 V. Lower reverse leakage improves circuit performance in high-impedance applications. The SMC 30CTQ040 specifies 1 mA @ 40 V, providing intermediate performance.

Q: Which substitute offers the best long-term availability?

A: The STPS3045CT from STMicroelectronics has the highest current inventory (38,369 units) and is from a major active manufacturer with established supply chain infrastructure. This part provides the strongest assurance of continued availability and supply continuity.

Q: Can substitutes be mixed in the same circuit?

A: All listed substitutes are functionally compatible and can be used interchangeably in circuit designs. However, mixing different part numbers in the same application is not recommended due to potential variations in forward voltage and reverse leakage characteristics, which could affect circuit performance balance.