IRFS7437-7PPBF Equivalent & Substitute Parts

Part Overview

The IRFS7437-7PPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 195A continuous drain current at 25°C. This device is designed for high-current switching applications requiring low on-resistance and is packaged in a D2PAK (7-Lead) surface mount configuration. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

IRFS7437-7PPBF

Infineon TechnologiesIn Stock: 2063IRFS7437-7PPBF Datasheet

Current PartRFQ

STH320N4F6-6

STMicroelectronicsIn Stock: 25442STH320N4F6-6 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRFS7437-7PPBF is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• FET Type: N-Channel topology
• Drain to Source Voltage (Vdss): 40V rating
• Continuous Drain Current (Id): Minimum 195A at 25°C
• On-Resistance (Rds On): Maximum 1.4 mOhm at specified gate voltage
• Gate Threshold Voltage (Vgs(th)): Within ±20V maximum gate voltage specification
• Operating Temperature Range: -55°C to 175°C
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

Package Compatibility Consideration: The original D2PAK (7-Lead) package must be physically compatible with the application PCB layout. Substitute parts may use alternative surface mount packages (H2PAK-6, TO-263 variants) provided the lead configuration and thermal characteristics support the intended application.

The STH320N4F6-6 meets all critical electrical parameters and maintains RoHS3 compliance, qualifying it as a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: STH320N4F6-6

The STH320N4F6-6 is the manufacturer-recommended substitute for the IRFS7437-7PPBF. This device meets or exceeds all critical electrical specifications:

• Continuous drain current of 200A exceeds the 195A requirement
• On-resistance of 1.3 mOhm at 80A is superior to the 1.4 mOhm specification
• Power dissipation rating of 300W provides increased thermal margin over the 231W original specification
• Gate charge of 240 nC is within acceptable switching performance parameters
• Operating temperature range matches the original specification
• ROHS3 compliance and REACH unaffected status maintain regulatory alignment

Product Status Consideration:

The IRFS7437-7PPBF is discontinued at DiGi Electronics. The STH320N4F6-6 is active in production with 25,400 units in stock, ensuring supply chain continuity. The STH320N4F6-6 carries AEC-Q101 automotive qualification, providing additional reliability assurance for demanding applications.

Package Transition:

The substitute uses H2PAK-6 packaging instead of the original D2PAK (7-Lead). PCB layout modification is required to accommodate the different lead configuration. Thermal performance is enhanced due to improved heat dissipation characteristics of the H2PAK-6 package.

Frequently Asked Questions (FAQ)

Q: Can the STH320N4F6-6 directly replace the IRFS7437-7PPBF without circuit modification?

A: Electrical substitution is valid based on matching Vdss, Id, Rds On, and gate voltage specifications. However, package geometry differs (H2PAK-6 versus D2PAK 7-Lead), requiring PCB layout changes. Gate charge and input capacitance values are similar, minimizing gate drive circuit adjustments.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are: N-Channel FET type, 40V Vdss rating, minimum 195A continuous drain current, on-resistance not exceeding 1.4 mOhm, gate threshold voltage within ±20V, and operating temperature range of -55°C to 175°C. All must be met or exceeded by the substitute part.

Q: Does the higher power dissipation rating of the STH320N4F6-6 (300W vs. 231W) affect circuit design?

A: The higher rating provides additional thermal margin and does not negatively impact circuit design. It indicates improved thermal performance and allows operation at higher power levels without exceeding junction temperature limits.

Q: Are there compliance or certification differences between the original and substitute?

A: Both parts are ROHS3 compliant and REACH unaffected. The STH320N4F6-6 carries AEC-Q101 automotive qualification, which is an additional certification not specified for the original part. This enhances reliability for automotive and industrial applications.

Q: How do gate charge differences affect switching performance?

A: The STH320N4F6-6 has a gate charge of 240 nC compared to 225 nC for the original. This 6.7% increase has minimal impact on switching speed and gate drive requirements. Existing gate drive circuits designed for the IRFS7437-7PPBF will function with the substitute without modification.

Q: What is the impact of different input capacitance values?

A: The STH320N4F6-6 has input capacitance of 13,800 pF at 15V compared to 7,437 pF at 25V for the original. This difference reflects measurement conditions rather than fundamental incompatibility. Gate drive circuits must be verified for adequate current sourcing capability, but typical designs accommodate this variation.

Q: Is the H2PAK-6 package thermally superior to the D2PAK (7-Lead)?

A: Yes. The H2PAK-6 package provides enhanced thermal dissipation characteristics, supporting the higher power rating of 300W. This allows better heat transfer to the PCB and external heat sinks, improving thermal performance in high-current applications.