400CMQ045 Equivalent & Substitute Parts

Part Overview

The 400CMQ045 is a Schottky diode module configured as a 1 Pair Common Cathode array rated for 45 V DC reverse voltage and 200 A average rectified current per diode. This component is designed for chassis mount applications in high-current rectification circuits. The original Vishay General Semiconductor - Diodes Division part is classified as obsolete, necessitating identification of functionally equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

400CMQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 2159400CMQ045 Datasheet

Current PartRFQ

400CMQ045

SMC Diode SolutionsIn Stock: 2144400CMQ045 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 400CMQ045 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-Negotiable):

• Diode configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage rating: 45 V DC reverse maximum
• Current rating: 200 A average rectified per diode
• Forward voltage: 570 mV @ 200 A
• Reverse leakage: 20 mA @ 45 V
• Recovery speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Temperature range: -55°C ~ 150°C

Mechanical Parameters (Non-Negotiable):

• Mounting type: Chassis Mount
• Base product number: 400CMQ

Compliance Parameters:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Substitute parts must match all electrical and mechanical parameters. Package variations (TO-244AB versus PRM4) are permitted when the underlying diode array specifications remain identical and the mounting configuration is maintained as chassis mount.

Parameter Comparison

Engineering Selection Recommendations

The 400CMQ045 from SMC Diode Solutions is a direct electrical and mechanical equivalent to the obsolete Vishay 400CMQ045. Both parts share identical electrical specifications, temperature operating range, and chassis mount configuration. The SMC Diode Solutions variant is currently in active production status, ensuring supply chain continuity.

Compliance Considerations:

Both parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), satisfying environmental and moisture sensitivity requirements. The SMC Diode Solutions part is classified as REACH Affected, whereas the original Vishay part is REACH Unaffected. This distinction requires evaluation within the context of end-use application and regional regulatory requirements.

Package Consideration:

The package transition from TO-244AB to PRM4 represents a physical form factor change. Both packages maintain chassis mount capability. PCB layout and thermal management design must accommodate the PRM4 package dimensions and mounting interface to ensure proper thermal dissipation and electrical performance in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SMC Diode Solutions 400CMQ045 be used as a direct replacement for the Vishay 400CMQ045?

A: The SMC Diode Solutions 400CMQ045 is electrically and mechanically equivalent. All critical electrical parameters, temperature range, and chassis mount configuration are identical. Package geometry differs (PRM4 versus TO-244AB), requiring PCB layout verification.

Q: What is the significance of the package change from TO-244AB to PRM4?

A: Both packages support chassis mount applications. The PRM4 package is an isolated variant. Physical dimensions, mounting hole patterns, and thermal interface characteristics differ. Mechanical integration into the target assembly must be validated against the PRM4 package specification.

Q: Does the REACH Affected status of the SMC part affect substitution eligibility?

A: REACH Affected status indicates the part contains substances of concern under REACH regulations. Substitution eligibility depends on end-use application location and applicable regulatory frameworks. This determination is outside the scope of electrical equivalence.

Q: Are the electrical performance characteristics identical between the two parts?

A: Yes. Both parts specify 45 V DC reverse voltage, 200 A average rectified current per diode, 570 mV forward voltage at 200 A, 20 mA reverse leakage at 45 V, and fast recovery speed ≤ 500ns. Operating temperature range is -55°C to 150°C for both.

Q: What is the significance of the SMC part being in Active status while the Vishay part is Obsolete?

A: Active status indicates current production and ongoing supply availability. The Vishay part's obsolete status necessitates transition to an alternative source. The SMC Diode Solutions part provides equivalent functionality with assured supply continuity.

Q: Are there any thermal management differences between the two packages?

A: Thermal performance depends on package design, mounting interface, and PCB thermal plane integration. Both packages support chassis mount configuration. Thermal analysis specific to the PRM4 package and target application thermal requirements must be conducted.