Equivalent & Substitute Parts for 240NQ045 Schottky Diode

Part Overview

The 240NQ045 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 240 A average rectified current. This component is classified as obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement. The part features a D-67 HALF-PAK chassis mount package and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

240NQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 905240NQ045 Datasheet

Current PartRFQ

240NQ045-1

SMC Diode SolutionsIn Stock: 1067240NQ045-1 Datasheet

MFR RecommendedRFQ

241NQ045-1

SMC Diode SolutionsIn Stock: 985241NQ045-1 Datasheet

MFR RecommendedRFQ

244NQ045-1

SMC Diode SolutionsIn Stock: 801244NQ045-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 240NQ045 is determined by the following critical parameters: voltage rating (45 V DC reverse), technology (Schottky), mounting configuration (Chassis Mount), package type (HALF-PAK), reverse leakage current (20 mA @ 45 V), and fast recovery speed (≤ 500ns, > 200mA). The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional compatibility within the original application circuit.

The three active substitute parts—240NQ045-1, 241NQ045-1, and 244NQ045-1—are manufactured by SMC Diode Solutions and share the HALF-PAK package configuration with PRM1-1 module designation. All substitutes maintain the 45 V reverse voltage rating, 20 mA reverse leakage specification, and fast recovery switching characteristics. Variations in forward voltage drop and average rectified current ratings are noted where applicable.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—240NQ045-1, 241NQ045-1, and 244NQ045-1—are active products manufactured by SMC Diode Solutions and maintain ROHS3 compliance with unlimited moisture sensitivity rating. The primary distinction among substitutes is the forward voltage drop specification and operating temperature range.

240NQ045-1 provides identical forward voltage characteristics (610 mV @ 240 A) to the original 240NQ045 and operates across -55°C to 150°C. This part is the closest electrical equivalent for applications requiring the original voltage drop performance.

241NQ045-1 specifies a higher forward voltage drop (690 mV @ 240 A) but extends the operating temperature range to -55°C to 175°C, suitable for high-temperature applications where the increased forward voltage is acceptable.

244NQ045-1 specifies a lower forward voltage drop (550 mV @ 240 A) and operates across -55°C to 125°C, appropriate for applications prioritizing reduced power dissipation within the specified temperature range.

Selection between these active alternatives depends on circuit requirements for forward voltage drop performance and thermal operating conditions. All substitutes maintain the critical 45 V reverse voltage rating, 20 mA reverse leakage current, and fast recovery switching speed required for functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can 240NQ045-1 be used as a direct replacement for the obsolete 240NQ045?

A: Yes. The 240NQ045-1 maintains identical forward voltage drop (610 mV @ 240 A), reverse voltage rating (45 V), reverse leakage current (20 mA @ 45 V), and fast recovery speed characteristics. Both parts use HALF-PAK chassis mount packaging and are ROHS3 compliant.

Q: What is the difference between 241NQ045-1 and 244NQ045-1?

A: The 241NQ045-1 specifies 690 mV forward voltage drop with -55°C to 175°C operating range. The 244NQ045-1 specifies 550 mV forward voltage drop with -55°C to 125°C operating range. Both maintain 45 V reverse voltage and 20 mA reverse leakage specifications. Selection depends on circuit requirements for voltage drop and thermal operating conditions.

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

A: All substitute parts use HALF-PAK package configuration with PRM1-1 module designation. Physical compatibility with the original D-67 HALF-PAK mounting should be confirmed through mechanical drawing comparison, as supplier device package designations may indicate module-level variations.

Q: Do the substitute parts maintain the same reverse leakage current specification?

A: Yes. All three substitute parts specify 20 mA reverse leakage current @ 45 V, identical to the original 240NQ045.

Q: What is the impact of forward voltage drop differences on circuit performance?

A: Forward voltage drop directly affects power dissipation and heat generation. The 244NQ045-1 (550 mV) produces lower dissipation than the original (610 mV), while the 241NQ045-1 (690 mV) produces higher dissipation. Circuit thermal design and efficiency requirements determine the appropriate selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All three substitute parts—240NQ045-1, 241NQ045-1, and 244NQ045-1—are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).