Equivalent & Substitute Parts for 30CTH03

Part Overview

The 30CTH03 is a diode array rectifier manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode design rated for 300 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in a TO-220-3 through-hole format and belongs to the FRED Pt® series of fast recovery diodes.

The 30CTH03 is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and production requirements for legacy systems utilizing this diode array. Active alternatives with identical or superior electrical characteristics are available from the same manufacturer and qualified third-party suppliers.

Substiute Parts

30CTH03

Vishay General Semiconductor - Diodes DivisionIn Stock: 218730CTH03 Datasheet

Current PartRFQ

VS-30CTH03-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 5694VS-30CTH03-M3 Datasheet

Parametric EquivalentRFQ

LQA32T300C

Power IntegrationsIn Stock: 1018LQA32T300C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 30CTH03 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Voltage - DC Reverse (Vr) (Max): 300 V minimum
• Current - Average Rectified (Io) (per Diode): 15 A minimum
• Mounting Type: Through Hole
• Package / Case: TO-220-3 compatible footprint

Acceptable Variation Parameters:

• Voltage - Forward (Vf): Equal or lower values are acceptable
• Reverse Recovery Time (trr): Equal or lower values are acceptable
• Current - Reverse Leakage @ Vr: Equal or lower values are acceptable
• Operating Temperature - Junction (Max): Equal or higher values are acceptable
• Technology: Standard or Schottky diode technology both qualify

Substitute parts must maintain identical pin configuration and mechanical compatibility with the TO-220-3 package to ensure direct board-level replacement without circuit modification.

Parameter Comparison

Engineering Selection Recommendations

VS-30CTH03-M3 (Parametric Equivalent)

The VS-30CTH03-M3 is the direct parametric equivalent to the 30CTH03. Both devices are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications across all critical parameters: 300 V reverse voltage, 15 A average rectified current, 1.25 V forward voltage at 15 A, and 36 ns reverse recovery time. The VS-30CTH03-M3 is currently in active production status with 5661 units in stock. This part achieves ROHS3 compliance, whereas the original 30CTH03 is RoHS non-compliant. The VS-30CTH03-M3 is supplied in tube packaging and maintains full mechanical and electrical compatibility with the original design.

LQA32T300C (Manufacturer-Recommended Alternative)

The LQA32T300C, manufactured by Power Integrations, is a qualified alternative rated for 300 V reverse voltage and 16 A average rectified current per diode, exceeding the 15 A requirement of the 30CTH03. This Schottky diode array demonstrates superior performance characteristics: reverse recovery time of 13 ns (compared to 36 ns), and reverse leakage current of 25 µA at 300 V (compared to 40 µA). The LQA32T300C is currently in active production with 987 units in stock and carries RoHS compliance certification. The forward voltage specification of 1.9 V at 16 A is higher than the 30CTH03 specification of 1.25 V at 15 A; this difference reflects the inherent characteristics of Schottky technology and must be evaluated within the context of the application circuit. The maximum operating junction temperature of 150 °C is lower than the 30CTH03 specification of 175 °C and must be verified against application thermal requirements.

Both substitute parts maintain TO-220-3 package compatibility and identical pin configuration, enabling direct board-level replacement without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the VS-30CTH03-M3 be used as a direct replacement for the 30CTH03?

A: Yes. The VS-30CTH03-M3 is a parametric equivalent with identical electrical specifications and pin configuration. Both devices are manufactured by Vishay and share the same base product number (30CTH). The VS-30CTH03-M3 is the active production variant of the obsolete 30CTH03 and provides full functional compatibility.

Q: What is the difference between the 30CTH03 and the LQA32T300C?

A: Both devices meet the 300 V reverse voltage and 15 A current requirements. The LQA32T300C uses Schottky diode technology, resulting in faster reverse recovery time (13 ns versus 36 ns) and lower reverse leakage current (25 µA versus 40 µA). However, the LQA32T300C has a higher forward voltage (1.9 V at 16 A versus 1.25 V at 15 A) and a lower maximum junction temperature (150 °C versus 175 °C). These differences must be evaluated against specific application requirements.

Q: Are there packaging differences between these substitute parts?

A: The 30CTH03 original packaging specification is not provided in the input data. The VS-30CTH03-M3 is supplied in tube packaging. The LQA32T300C is supplied in tube packaging with a TO-220AB supplier device package designation. All three parts use the TO-220-3 case format for board mounting and are mechanically compatible.

Q: What is the significance of RoHS compliance for these parts?

A: The original 30CTH03 is RoHS non-compliant. The VS-30CTH03-M3 achieves ROHS3 compliance, and the LQA32T300C achieves RoHS compliance. RoHS compliance indicates the absence of restricted substances (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers) in the component. Selection of RoHS-compliant alternatives may be required by regulatory requirements, customer specifications, or manufacturing standards applicable to the end application.

Q: Can the LQA32T300C be used in applications requiring the 175 °C maximum junction temperature specification?

A: The LQA32T300C is rated for a maximum junction temperature of 150 °C, which is 25 °C lower than the 30CTH03 specification of 175 °C. Applications requiring operation at junction temperatures between 150 °C and 175 °C cannot use the LQA32T300C. The VS-30CTH03-M3 maintains the 175 °C maximum junction temperature specification and is the appropriate choice for such applications.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration indicates the diode array contains two diodes with a shared cathode terminal. The common cathode connection is a standard pin configuration in TO-220-3 packages. All three parts (30CTH03, VS-30CTH03-M3, and LQA32T300C) share this identical configuration, ensuring pin-for-pin compatibility.

Q: Are there inventory considerations when selecting a substitute?

A: The VS-30CTH03-M3 has 5661 units in stock, the LQA32T300C has 987 units in stock, and the original 30CTH03 has 2100 units in stock. Inventory availability may influence selection timing and supply chain planning for production or repair operations.