Equivalent & Substitute Parts for 249NQ135

Part Overview

The 249NQ135 is a Schottky diode rated for 135V DC reverse voltage and 240A average rectified current, housed in a D-67 HALF-PAK chassis mount package. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The fast recovery characteristic (≤500ns for currents >200mA) and low forward voltage drop (1.07V @ 240A) define its primary application requirements.

Substiute Parts

249NQ135

Vishay General Semiconductor - Diodes DivisionIn Stock: 1022249NQ135 Datasheet

Current PartRFQ

249NQ135-1

SMC Diode SolutionsIn Stock: 730249NQ135-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 249NQ135 is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical):

• Voltage - DC Reverse (Vr) (Max): 135V
• Current - Average Rectified (Io): 240A
• Voltage - Forward (Vf) (Max) @ If: 1.07V @ 240A
• Speed: Fast Recovery ≤500ns, >200mA
• Current - Reverse Leakage @ Vr: 6mA @ 135V
• Capacitance @ Vr, F: 6000pF @ 5V, 1MHz

Mechanical Parameters (Critical):

• Mounting Type: Chassis Mount
• Package / Case: HALF-PAK configuration

Compliance Parameters:

• Technology: Schottky
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The 249NQ135-1 qualifies as a direct substitute based on identical electrical specifications and compatible HALF-PAK packaging, with the distinction of active product status and REACH compliance applicability.

Parameter Comparison

Engineering Selection Recommendations

The 249NQ135-1 manufactured by SMC Diode Solutions is the designated substitute for the obsolete 249NQ135. Selection of this substitute is supported by the following factors:

Electrical Equivalence: All critical electrical parameters—reverse voltage rating, average rectified current, forward voltage drop, recovery speed, reverse leakage current, and junction capacitance—are identical between the main part and substitute.

Mechanical Compatibility: Both components utilize HALF-PAK chassis mount packaging, ensuring mechanical fit and thermal interface compatibility in existing designs.

Compliance Status: The 249NQ135-1 maintains ROHS3 compliance and MSL 1 rating, consistent with the original part. The substitute is subject to REACH regulations, whereas the original part is REACH unaffected; this distinction reflects current regulatory applicability and does not affect functional performance.

Product Availability: The 249NQ135-1 holds active product status with current inventory availability (674 units), whereas the 249NQ135 is obsolete. This transition ensures continued supply chain access and long-term design support.

Frequently Asked Questions (FAQ)

Q: Can the 249NQ135-1 be used as a direct replacement for the 249NQ135 in existing designs?

A: Yes. The 249NQ135-1 is electrically and mechanically equivalent to the 249NQ135. All electrical parameters—voltage rating, current capacity, forward voltage, recovery speed, and leakage characteristics—are identical. Both components use HALF-PAK chassis mount packaging, ensuring compatibility with existing PCB layouts and thermal management systems.

Q: What is the difference between the D-67 HALF-PAK and PRM1-1 (Half Pak Module) package designations?

A: Both designations refer to the same HALF-PAK form factor used for chassis mount applications. The D-67 designation is the original Vishay package identifier, while PRM1-1 is the SMC Diode Solutions equivalent designation for the same physical and electrical package configuration.

Q: Why is the 249NQ135 classified as obsolete?

A: The 249NQ135 is no longer in active production. The 249NQ135-1 represents the current active equivalent from SMC Diode Solutions, providing identical electrical and mechanical performance with ongoing supply chain support.

Q: Are there any compliance differences between the 249NQ135 and 249NQ135-1?

A: Both parts are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity) ratings. The 249NQ135-1 is subject to REACH regulations, while the original 249NQ135 is REACH unaffected. This reflects current regulatory classification and does not impact functional performance or reliability.

Q: What are the key electrical parameters that define substitution eligibility for this Schottky diode?

A: Substitution eligibility is determined by matching the following parameters: 135V DC reverse voltage rating, 240A average rectified current, 1.07V forward voltage drop at 240A, fast recovery speed (≤500ns for currents >200mA), 6mA reverse leakage current at 135V, and 6000pF junction capacitance at 5V and 1MHz. Mechanical compatibility requires chassis mount configuration and HALF-PAK packaging.

Q: Is the 249NQ135-1 available in the same packaging options as the 249NQ135?

A: The 249NQ135-1 is supplied in bulk packaging, whereas the original 249NQ135 packaging type is not specified in the available data. Both components use identical HALF-PAK chassis mount form factors, ensuring mechanical and thermal interface compatibility regardless of bulk or alternative packaging configurations.