Equivalent & Substitute Parts for 30CTQ045 Schottky Diode Array

Part Overview

The 30CTQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 45 V DC reverse voltage and 15 A average rectified current per diode. This component is packaged in a Through Hole TO-220-3 configuration and features fast recovery characteristics suitable for switching applications.

The 30CTQ045 has reached obsolete product status. Equivalent and substitute parts are available from active manufacturers including onsemi, STMicroelectronics, and Diotec Semiconductor. These alternatives maintain the core electrical specifications while offering improved availability and compliance with current regulatory standards.

Substiute Parts

30CTQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 193130CTQ045 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

30CTQ045

Diotec SemiconductorIn Stock: 191430CTQ045 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 30CTQ045 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

• Diode Configuration: 1 Pair Common Cathode (must match exactly)
• Technology: Schottky (must match exactly)
• Voltage - DC Reverse (Vr) (Max): 45 V (must equal or exceed)
• Current - Average Rectified (Io) (per Diode): 15 A (must equal or exceed)
• Mounting Type: Through Hole (for direct replacement)
• Package / Case: TO-220-3 (for direct replacement)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (must match)

Allowable Variations:

• Voltage - Forward (Vf) (Max) @ If: May vary within acceptable design margins
• Current - Reverse Leakage @ Vr: May vary; lower values indicate improved performance
• Operating Temperature - Junction (Max): May exceed the original specification
• RoHS Status: Active parts may be ROHS3 Compliant while original is non-compliant
• Product Status: Active parts are preferred over obsolete parts

Substitute parts are grouped into two categories: Manufacturer Recommended equivalents (identical electrical and mechanical specifications with Through Hole TO-220-3 packaging) and Parametric Equivalents (identical electrical specifications but different packaging technology).

Parameter Comparison

Engineering Selection Recommendations

Direct Through-Hole Replacements (Pin-Compatible, TO-220-3 Package):

The following parts are suitable for direct replacement in existing Through Hole TO-220-3 circuit board layouts:

• MBR2545CTG (onsemi): Maintains 15 A current rating and 45 V reverse voltage specification. Offers improved reverse leakage performance (200 µA vs. 2 mA) and extended lower operating temperature range (-65°C). ROHS3 Compliant with Active product status. Recommended for new designs and production restocking.

• STPS3045CT (STMicroelectronics): Maintains 15 A current rating and 45 V reverse voltage specification. Provides lower forward voltage (570 mV vs. 620 mV) and extended maximum junction temperature (200°C). ROHS3 Compliant with Active product status and highest inventory availability (38,369 pcs).

• STPS30L45CT (STMicroelectronics): Maintains 15 A current rating and 45 V reverse voltage specification. Offers lowest forward voltage (550 mV vs. 620 mV) for improved efficiency. ROHS3 Compliant with Active product status. Note: Maximum junction temperature is 150°C, which is lower than the original specification.

Current-Reduced Alternative (Through Hole, TO-220-3 Package):

• STPS2545CT (STMicroelectronics): Rated for 12.5 A average rectified current (vs. 15 A original). Maintains 45 V reverse voltage specification. Provides lower forward voltage (570 mV vs. 620 mV). ROHS3 Compliant with Active product status. Suitable only for applications where 12.5 A current rating is acceptable.

Parametric Equivalent (Surface Mount Alternative):

• 30CTQ045 (Diotec Semiconductor): Identical electrical specifications to the original part (45 V, 15 A, 620 mV forward voltage). Packaged in Surface Mount TO-263-3 (D2PAK) configuration instead of Through Hole TO-220-3. ROHS3 Compliant with Active product status. Requires circuit board redesign for surface mount assembly. Offers superior reverse leakage performance (50 µA vs. 2 mA).

Compliance Consideration:

All substitute parts listed are ROHS3 Compliant, addressing regulatory requirements that the original obsolete 30CTQ045 (Vishay) does not meet. Selection should prioritize Active product status parts to ensure long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use STPS2545CT as a direct replacement for 30CTQ045?

A: STPS2545CT is electrically compatible for most applications but is rated for 12.5 A average rectified current versus the original 15 A specification. Direct substitution is acceptable only if your circuit design operates at or below 12.5 A. For applications requiring the full 15 A rating, use MBR2545CTG, STPS3045CT, or STPS30L45CT instead.

Q: What is the difference between the Through Hole and Surface Mount versions?

A: The Vishay 30CTQ045 and onsemi MBR2545CTG, STMicroelectronics STPS3045CT, and STPS30L45CT are all Through Hole TO-220-3 packages suitable for insertion into existing printed circuit boards. The Diotec 30CTQ045 is a Surface Mount TO-263-3 (D2PAK) package requiring different assembly methods and circuit board layout. Surface mount versions are not pin-compatible with Through Hole designs without board redesign.

Q: Why does the original 30CTQ045 show higher reverse leakage current (2 mA) compared to substitutes?

A: The original Vishay 30CTQ045 specifies 2 mA reverse leakage at 45 V, while active substitutes (MBR2545CTG, STPS3045CT, STPS30L45CT) specify 200 µA, 200 µA, and 400 µA respectively. This difference reflects manufacturing process improvements in modern Schottky diode technology. Lower reverse leakage indicates improved device performance and is not a compatibility concern for substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant. The original Vishay 30CTQ045 is RoHS non-compliant. If your application or supply chain requires RoHS compliance, any of the listed substitutes are acceptable alternatives.

Q: What is the significance of forward voltage differences between parts?

A: Forward voltage varies among substitutes: 30CTQ045 (Vishay) and MBR2545CTG specify 620 mV @ 15 A, while STPS3045CT specifies 570 mV @ 15 A, and STPS30L45CT specifies 550 mV @ 15 A. Lower forward voltage results in reduced power dissipation and improved circuit efficiency. All values are within acceptable design margins for Schottky diode applications. Selection based on forward voltage is application-dependent and should be verified against thermal design requirements.

Q: Can I use a substitute part with a higher maximum junction temperature?

A: Yes. STPS3045CT specifies a maximum junction temperature of 200°C compared to the original 175°C specification. Higher maximum junction temperature provides additional thermal margin and is not a compatibility concern. However, STPS30L45CT specifies a maximum junction temperature of 150°C, which is lower than the original. Use of STPS30L45CT requires verification that your circuit design does not exceed 150°C junction temperature under worst-case operating conditions.

Q: What is the difference between "Manufacturer Recommended" and "Parametric Equivalent" substitutes?

A: Manufacturer Recommended substitutes (MBR2545CTG, STPS2545CT, STPS3045CT, STPS30L45CT) are Through Hole TO-220-3 packages that are pin-compatible with the original 30CTQ045 and can be used as direct replacements in existing circuit board designs. Parametric Equivalents (Diotec 30CTQ045) maintain identical electrical specifications but use different packaging technology (Surface Mount TO-263-3) and require circuit board redesign for implementation.

Q: Is the 30CTQ045 from Diotec a direct replacement for the Vishay version?

A: The Diotec 30CTQ045 is electrically equivalent but not a direct pin-compatible replacement. It uses Surface Mount TO-263-3 (D2PAK) packaging instead of Through Hole TO-220-3. The Diotec part is suitable for new designs or redesigned circuit boards using surface mount assembly methods. For direct Through Hole replacement without board modification, use MBR2545CTG, STPS3045CT, or STPS30L45CT instead.

Q: Which substitute part offers the best overall performance?

A: Selection depends on specific application requirements. STPS3045CT offers the highest inventory availability (38,369 pcs), extended maximum junction temperature (200°C), and improved forward voltage (570 mV). STPS30L45CT offers the lowest forward voltage (550 mV) for maximum efficiency but has a lower maximum junction temperature (150°C). MBR2545CTG offers the best reverse leakage performance (200 µA) and extended lower operating temperature range (-65°C). All three are ROHS3 Compliant with Active product status.