401CMQ045 Equivalent & Substitute Parts

Part Overview

The 401CMQ045 is a Schottky diode module manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode array rated for 45 V DC reverse voltage and 200 A average rectified current per diode. The device is housed in a TO-244AB chassis mount package and features fast recovery characteristics suitable for high-current rectification applications.

This part is classified as Obsolete, necessitating identification of equivalent substitute components that maintain functional and electrical compatibility with existing designs. Substitute parts must satisfy the same electrical specifications, mounting requirements, and environmental operating conditions to ensure direct replacement capability.

Substiute Parts

401CMQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 916401CMQ045 Datasheet

Current PartRFQ

401CMQ045

SMC Diode SolutionsIn Stock: 1229401CMQ045 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 401CMQ045 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Diode configuration must be 1 Pair Common Cathode
• Technology must be Schottky
• Voltage - DC Reverse (Vr) (Max) must equal 45 V
• Current - Average Rectified (Io) (per Diode) must equal or exceed 200 A
• Speed must be Fast Recovery ≤ 500 ns, > 200 mA (Io)
• Current - Reverse Leakage @ Vr must equal 20 mA @ 45 V

Mechanical and Environmental Criteria:

• Mounting Type must be Chassis Mount
• Operating Temperature - Junction range must encompass or match -55°C ~ 175°C
• RoHS3 Compliance required
• MSL rating must be 1 (Unlimited)

Package Compatibility:

• Physical package form must support direct mounting in existing circuit board layouts
• Pin configuration and isolation characteristics must be compatible with application requirements

Substitute parts meeting all electrical, mechanical, and environmental parameters are classified as direct equivalents and may be selected based on availability, compliance status, and operational temperature requirements.

Parameter Comparison

Engineering Selection Recommendations

The SMC Diode Solutions 401CMQ045 (PRM4 package) is an active substitute for the obsolete Vishay 401CMQ045 (TO-244AB package). Both components satisfy the core electrical specifications for Schottky diode array applications requiring 45 V reverse voltage and fast recovery characteristics.

Selection Basis:

The SMC Diode Solutions variant is classified as Active product status, ensuring continued availability and manufacturing support. Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), meeting regulatory and environmental requirements.

Package Consideration:

The substitute part utilizes a PRM4 package form in place of the original TO-244AB package. Physical mounting compatibility must be verified against the application's circuit board layout and mechanical constraints. The PRM4 package is specified as isolated, which may affect electrical isolation characteristics in the application circuit.

Temperature Operating Range:

The SMC Diode Solutions substitute operates across -55°C to 150°C, compared to the original -55°C to 175°C range. Applications requiring junction temperatures above 150°C must retain the original Vishay component or identify alternative substitutes with extended temperature ratings.

Forward Voltage Characteristic:

The SMC Diode Solutions substitute exhibits a lower forward voltage drop (570 mV @ 200 A) compared to the original (670 mV @ 200 A). This represents improved efficiency and reduced thermal dissipation in rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can the SMC Diode Solutions 401CMQ045 directly replace the Vishay 401CMQ045 in all applications?

A: Direct replacement is possible when the application operates within the SMC substitute's specified temperature range (-55°C to 150°C) and the PRM4 package form is mechanically compatible with the circuit board layout. Package form differences require physical verification.

Q: What is the significance of the PRM4 package being specified as "Isolated"?

A: The isolated designation indicates electrical isolation characteristics of the PRM4 package form. Applications requiring specific isolation properties must confirm compatibility with the original TO-244AB package isolation characteristics.

Q: How does the lower forward voltage of the SMC substitute affect circuit performance?

A: The reduced forward voltage drop (570 mV versus 670 mV @ 200 A) results in lower power dissipation and reduced thermal generation during rectification. Circuit designs accounting for the original forward voltage specification will experience improved thermal performance with the substitute.

Q: Is the SMC Diode Solutions substitute suitable for applications operating at 175°C junction temperature?

A: No. The SMC substitute is rated to 150°C maximum junction temperature. Applications requiring 175°C operation must use the original Vishay component or identify alternative substitutes with extended temperature ratings.

Q: What compliance certifications apply to both components?

A: Both the original Vishay 401CMQ045 and the SMC Diode Solutions substitute are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The SMC substitute is REACH Affected, while the original is REACH Unaffected.

Q: Are there inventory considerations for component selection?

A: The SMC Diode Solutions substitute currently maintains higher inventory availability (1175 Pcs) compared to the original Vishay component (865 Pcs). Long-term supply chain planning should account for the original component's obsolete status.