FQB7N65CTM Equivalent & Substitute Parts

Part Overview

The FQB7N65CTM is an N-Channel MOSFET manufactured by onsemi, rated for 650V drain-to-source voltage and 7A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing.

The FQB7N65CTM belongs to the QFET® series and is designed for high-voltage switching applications requiring reliable performance across industrial temperature ranges. Due to its obsolete status, active alternative components with matching or superior electrical characteristics are required for new designs and production replacements.

Substiute Parts

FQB7N65CTM

onsemiIn Stock: 2374FQB7N65CTM Datasheet

Current PartRFQ

IRF540NSTRLPBF

Infineon TechnologiesIn Stock: 35365IRF540NSTRLPBF Datasheet

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STB8N65M5

STMicroelectronicsIn Stock: 3046STB8N65M5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FQB7N65CTM is determined by strict alignment of electrical and mechanical parameters within the N-Channel MOSFET category. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 650V
• Continuous Drain Current (Id): Must equal or exceed 7A at 25°C
• Package Type: Must be TO-263 (D2PAK) surface mount
• FET Type: N-Channel MOSFET technology
• Gate Drive Voltage: Compatible with 10V drive voltage specification

Secondary Compatibility Parameters:

• On-State Resistance (Rds On): Lower or equal values indicate improved performance
• Gate Charge (Qg): Lower values reduce switching losses
• Operating Temperature Range: Must accommodate -55°C to 150°C minimum
• Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for reliability

Substitutes are grouped based on voltage class (650V) and current rating (7A) alignment. Parts meeting these core electrical specifications within the D2PAK package are considered direct equivalents or functional replacements.

Parameter Comparison

Engineering Selection Recommendations

STB8N65M5 (STMicroelectronics) – Primary Substitute

The STB8N65M5 is the recommended direct substitute for the FQB7N65CTM. Both devices share identical voltage (650V) and current (7A) ratings with matching D2PAK packaging and surface mount configuration. The STB8N65M5 is currently in active production status, ensuring long-term availability and supply chain stability.

Key advantages of the STB8N65M5 include lower on-state resistance (0.6 Ohm versus 1.4 Ohm), reduced gate charge (15 nC versus 36 nC), and ROHS3 compliance certification. The operating temperature range extends to 150°C, meeting the FQB7N65CTM specification. Moisture sensitivity level remains at MSL 1 (Unlimited), maintaining reliability standards.

IRF540NSTRLPBF (Infineon Technologies) – Conditional Substitute

The IRF540NSTRLPBF is not a direct substitute due to significantly lower voltage rating (100V versus 650V). This device is suitable only for applications where the 650V voltage requirement can be reduced to 100V or lower. The IRF540NSTRLPBF offers superior current handling (33A versus 7A) and lower on-state resistance (0.044 Ohm), making it applicable to lower-voltage, higher-current switching circuits.

The IRF540NSTRLPBF is in active production with extended operating temperature range (-55°C to 175°C) and ROHS3 compliance. D2PAK packaging and surface mount configuration remain compatible. This substitute is not recommended for direct replacement in 650V applications.

Compliance and Certification Status

Both active substitutes maintain MSL 1 (Unlimited) moisture sensitivity classification and REACH Unaffected status, matching the FQB7N65CTM environmental compliance profile. ECCN and HTSUS classifications remain consistent across all three devices (EAR99 and 8541.29.0095 respectively).

Frequently Asked Questions (FAQ)

Q: Can the STB8N65M5 directly replace the FQB7N65CTM in existing designs?

A: Yes. The STB8N65M5 meets all primary electrical specifications (650V, 7A) and package requirements (TO-263 D2PAK, surface mount). The lower on-state resistance and reduced gate charge represent performance improvements. No circuit modifications are required for direct substitution.

Q: Why is the IRF540NSTRLPBF listed as a substitute if it has a lower voltage rating?

A: The IRF540NSTRLPBF is listed as a substitute for applications where voltage requirements can be reduced below 650V. It is not suitable for direct replacement in circuits requiring 650V operation. Voltage derating or circuit redesign is necessary for this substitute.

Q: What is the significance of the lower on-state resistance in the STB8N65M5?

A: Lower on-state resistance (0.6 Ohm versus 1.4 Ohm) reduces conduction losses and heat dissipation during switching operation. This improves overall circuit efficiency and may reduce thermal management requirements. The STB8N65M5 provides superior performance in this parameter.

Q: Are there any temperature range differences between the FQB7N65CTM and STB8N65M5?

A: Both devices operate across -55°C to 150°C. The STB8N65M5 maintains this specification, ensuring compatibility in temperature-sensitive applications. The IRF540NSTRLPBF extends to 175°C, offering additional thermal margin for high-temperature environments.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean for component handling?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. Standard storage and handling procedures apply without special dry-pack requirements or bake-out procedures. All three devices in this comparison share this classification.

Q: Is the D2PAK package identical across all three devices?

A: Yes. All three devices use TO-263 (D2PAK) surface mount packaging with 2 leads plus tab configuration. PCB footprints and soldering procedures are identical, enabling direct physical substitution without layout modifications.

Q: What is the impact of gate charge differences on circuit design?

A: Gate charge affects switching speed and driver circuit requirements. The STB8N65M5 (15 nC) requires less gate charge than the FQB7N65CTM (36 nC), resulting in faster switching transitions and reduced driver power consumption. The IRF540NSTRLPBF (71 nC) requires higher gate charge, potentially necessitating driver circuit adjustments.

Q: Are there compliance or certification differences between the substitutes?

A: The STB8N65M5 carries ROHS3 compliance certification. The FQB7N65CTM and IRF540NSTRLPBF compliance status is not specified in available documentation. All three devices maintain REACH Unaffected status and identical ECCN/HTSUS classifications.