IRF3805LPBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRF3805LPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 75A continuous drain current in a TO-262 through-hole package. This device belongs to the HEXFET® series and is classified as obsolete. Due to its obsolete product status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

IRF3805LPBF

Infineon TechnologiesIn Stock: 3248IRF3805LPBF Datasheet

Current PartRFQ

IRFSL3206PBF

Infineon TechnologiesIn Stock: 1822IRFSL3206PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRF3805LPBF are identified based on strict electrical and mechanical compatibility criteria. The primary substitute, IRFSL3206PBF, maintains compatibility through the following allowed parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss): Substitute rating of 60V exceeds the 55V requirement, providing backward compatibility
• Continuous Drain Current (Id): Substitute rating of 120A exceeds the 75A requirement, providing margin
• On-State Resistance (Rds On): Substitute value of 3mOhm @ 75A, 10V is equal to or lower than the original 3.3mOhm, ensuring equivalent or improved performance
• Gate Threshold Voltage (Vgs(th)): Both devices specify 4V maximum, ensuring gate drive compatibility
• Power Dissipation: Both devices rated at 300W (Tc), maintaining thermal design parameters
• Operating Temperature Range: Both devices operate across -55°C to 175°C (TJ), ensuring thermal envelope compatibility

Mechanical Compatibility Criteria:

• Package Type: Both devices use TO-262-3 Long Leads (I2PAK, TO-262AA) through-hole mounting, ensuring direct PCB footprint compatibility
• Mounting Type: Both are through-hole devices with identical lead configuration

Parameter Comparison

Engineering Selection Recommendations

The IRFSL3206PBF is the qualified substitute for the IRF3805LPBF based on the following engineering criteria:

Product Status Justification: The IRF3805LPBF is classified as obsolete, making the active-status IRFSL3206PBF the appropriate replacement for ongoing production and field service applications.

Electrical Performance: The IRFSL3206PBF exceeds the electrical specifications of the IRF3805LPBF across all critical parameters. The higher Vdss rating (60V vs. 55V) and increased continuous drain current capability (120A vs. 75A) provide design margin. The lower on-state resistance (3mOhm vs. 3.3mOhm) at the same gate drive voltage (10V) results in reduced conduction losses and improved thermal performance.

Compliance and Certifications: Both devices share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8541.29.0095). The IRFSL3206PBF carries ROHS3 compliance certification, meeting current regulatory requirements for new designs.

Thermal and Mechanical Compatibility: Identical power dissipation ratings (300W Tc), operating temperature ranges (-55°C to 175°C TJ), and TO-262-3 through-hole packaging ensure direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the IRFSL3206PBF be used as a direct replacement for the IRF3805LPBF in existing designs?

A: Yes. The IRFSL3206PBF is electrically and mechanically compatible with the IRF3805LPBF. Both devices use identical TO-262-3 through-hole packaging, operate across the same temperature range (-55°C to 175°C TJ), and share the same power dissipation rating (300W Tc). The substitute part exceeds the original specifications in voltage rating, current capability, and on-state resistance performance.

Q: What are the key electrical differences between these two parts?

A: The IRFSL3206PBF provides higher voltage and current ratings (60V/120A vs. 55V/75A) and lower on-state resistance (3mOhm vs. 3.3mOhm at 75A, 10V). Gate charge is reduced (170nC vs. 290nC at 10V), resulting in faster switching characteristics. These differences represent performance improvements rather than incompatibilities.

Q: Are there any package or pinout differences?

A: No. Both devices use the TO-262-3 Long Leads package (I2PAK, TO-262AA) with identical through-hole lead configuration. No PCB modifications are required for substitution.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The IRF3805LPBF is obsolete and no longer manufactured. The IRFSL3206PBF is an active product with current manufacturing support, ensuring long-term availability for production and field replacement applications.

Q: Do both devices meet the same regulatory and compliance standards?

A: Both devices share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8541.29.0095). The IRFSL3206PBF additionally carries ROHS3 compliance certification, meeting current environmental regulations for new designs.

Q: How do the gate charge specifications affect circuit design?

A: The IRFSL3206PBF has lower gate charge (170nC vs. 290nC at 10V), requiring less energy to switch the device. This results in faster switching times and reduced gate drive circuit stress, providing a design advantage over the original part.

Q: Is the moisture sensitivity level the same for both parts?

A: Yes. Both devices are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.