Equivalent & Substitute Parts for 240NQ040 Schottky Diode

Part Overview

The 240NQ040 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 240 A average rectified current, housed in a D-67 HALF-PAK chassis mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Substiute Parts

240NQ040

Vishay General Semiconductor - Diodes DivisionIn Stock: 943240NQ040 Datasheet

Current PartRFQ

240NQ040-1

SMC Diode SolutionsIn Stock: 1145240NQ040-1 Datasheet

MFR RecommendedRFQ

241NQ040-1

SMC Diode SolutionsIn Stock: 881241NQ040-1 Datasheet

MFR RecommendedRFQ

244NQ040-1

SMC Diode SolutionsIn Stock: 1030244NQ040-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 240NQ040 are qualified based on electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications for voltage rating (40 V), current rating (240 A), reverse leakage current (20 mA @ 40 V), capacitance (10300 pF @ 5V, 1MHz), and recovery speed characteristics (Fast Recovery ≤ 500ns, > 200mA). All substitutes are housed in HALF-PAK chassis mount packages and comply with ROHS3 standards.

The primary differentiators among substitute parts are forward voltage drop (Vf) at rated current and maximum operating junction temperature. These parameters are provided explicitly in the component specifications and determine suitability for specific thermal and efficiency requirements.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (240NQ040-1, 241NQ040-1, and 244NQ040-1) are manufactured by SMC Diode Solutions and carry active product status, ensuring long-term availability and supply chain continuity. All substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating, meeting environmental and reliability standards equivalent to the original component.

240NQ040-1 provides direct electrical equivalence to the original 240NQ040, with identical forward voltage drop (610 mV @ 240 A) and is suitable for applications requiring thermal operation up to 150°C junction temperature.

241NQ040-1 offers extended thermal capability to 175°C junction temperature but exhibits higher forward voltage drop (690 mV @ 240 A), resulting in increased power dissipation. This part is appropriate for high-temperature environments where thermal margin is critical.

244NQ040-1 delivers the lowest forward voltage drop (550 mV @ 240 A), minimizing power dissipation and heat generation. However, its maximum junction temperature is limited to 125°C, making it suitable for applications with moderate thermal requirements and efficiency optimization priorities.

Frequently Asked Questions (FAQ)

Q: Can 240NQ040-1 be used as a direct replacement for the obsolete 240NQ040?

A: Yes. The 240NQ040-1 maintains identical electrical specifications including voltage rating (40 V), current rating (240 A), forward voltage drop (610 mV @ 240 A), reverse leakage current (20 mA @ 40 V), and recovery speed characteristics. Both components use HALF-PAK chassis mount packaging and comply with ROHS3 standards.

Q: What is the primary difference between 240NQ040-1 and 244NQ040-1?

A: The primary difference is forward voltage drop. The 244NQ040-1 exhibits lower forward voltage (550 mV @ 240 A) compared to 240NQ040-1 (610 mV @ 240 A), resulting in reduced power dissipation. The 244NQ040-1 is limited to 125°C maximum junction temperature, while 240NQ040-1 operates to 150°C.

Q: Why does 241NQ040-1 have higher forward voltage drop than the other substitutes?

A: The 241NQ040-1 is specified with 690 mV forward voltage drop at 240 A. This higher drop is a characteristic of this particular device variant. The 241NQ040-1 compensates with extended thermal capability to 175°C junction temperature, making it suitable for high-temperature applications where thermal performance takes priority over efficiency.

Q: Are all substitute parts compatible with the original D-67 HALF-PAK footprint?

A: All substitute parts use HALF-PAK chassis mount packaging. The 240NQ040 specifies D-67 HALF-PAK, while substitutes specify HALF-PAK with PRM1-1 module designation. Both designations refer to the same physical package form factor suitable for chassis mount applications.

Q: What compliance certifications apply to the substitute parts?

A: All substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1). The substitutes are REACH Affected, whereas the original 240NQ040 is REACH Unaffected. All parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080.

Q: Which substitute part should be selected for maximum thermal performance?

A: The 241NQ040-1 provides the highest maximum junction temperature rating at 175°C, making it the appropriate choice for applications requiring extended thermal operating range. This part accepts higher forward voltage drop (690 mV @ 240 A) as a trade-off for thermal capability.

Q: Which substitute part minimizes power dissipation?

A: The 244NQ040-1 exhibits the lowest forward voltage drop at 550 mV @ 240 A, resulting in minimum power dissipation at rated current. This part is suitable for efficiency-critical applications operating within its 125°C maximum junction temperature limit.