IRF3711ZCSTRR Equivalent & Substitute Parts

Part Overview

The IRF3711ZCSTRR is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 92A continuous drain current in a D2PAK surface mount package. This device is classified as Obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for applications utilizing this component.

Substiute Parts

IRF3711ZCSTRR

Infineon TechnologiesIn Stock: 1108IRF3711ZCSTRR Datasheet

Current PartRFQ

IRFR3711ZTRPBF

Infineon TechnologiesIn Stock: 6124IRFR3711ZTRPBF Datasheet

MFR RecommendedRFQ

BUK9609-40B,118

Nexperia USA Inc.In Stock: 6360BUK9609-40B,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF3711ZCSTRR is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) must equal or exceed 20V
• Continuous Drain Current (Id) must meet or exceed 92A at 25°C
• On-state resistance (Rds On) must not significantly degrade circuit performance
• Gate threshold voltage (Vgs(th)) must remain within acceptable switching characteristics
• Power dissipation capability must support thermal requirements
• Gate charge and input capacitance must be compatible with drive circuitry

Mechanical Compatibility Criteria:

• Package type must be compatible with existing PCB layouts
• Surface mount configuration must match assembly processes
• Lead configuration and thermal tab design must accommodate existing thermal management

The substitute parts identified are grouped based on their ability to satisfy these parameters within the constraints of available component specifications.

Parameter Comparison

Engineering Selection Recommendations

IRFR3711ZTRPBF (Infineon Technologies): This substitute provides the closest electrical match to the IRF3711ZCSTRR, with identical Vdss (20V) and nearly equivalent continuous drain current (93A versus 92A). The Rds On is marginally improved at 5.7mOhm compared to 6mOhm. However, the package differs: IRFR3711ZTRPBF uses DPAK (TO-252-3) versus the D2PAK (TO-263-3) of the main part, requiring PCB layout modification. The device carries ROHS3 compliance and is rated "Not For New Designs," indicating limited long-term availability. Inventory availability is substantial at 6083 pieces.

BUK9609-40B,118 (Nexperia USA Inc.): This substitute offers higher voltage rating (40V versus 20V) and maintains the same D2PAK package as the main part, eliminating layout redesign requirements. Continuous drain current is lower at 75A compared to 92A, representing a 18.5% reduction in current capacity. Rds On is slightly higher at 7mOhm. The device is classified as Active with AEC-Q101 automotive qualification and ROHS3 compliance, providing superior long-term availability and regulatory standing. Inventory availability is 6346 pieces. This substitute is suitable for applications where the 20V voltage rating is not a hard requirement and where the reduced current capacity is acceptable.

Product Status Considerations: The main part (IRF3711ZCSTRR) is Obsolete. IRFR3711ZTRPBF is rated "Not For New Designs," indicating restricted future support. BUK9609-40B,118 is the only Active substitute, offering the most reliable long-term supply chain position and regulatory compliance for new production.

Frequently Asked Questions (FAQ)

Q: Can IRFR3711ZTRPBF directly replace IRF3711ZCSTRR without PCB modification?

A: No. While electrical parameters are nearly identical, the package differs. IRF3711ZCSTRR uses D2PAK (TO-263-3), while IRFR3711ZTRPBF uses DPAK (TO-252-3). These packages have different footprints and thermal tab configurations, requiring PCB layout redesign and re-qualification of thermal performance.

Q: Is BUK9609-40B,118 suitable for applications designed for 20V operation?

A: BUK9609-40B,118 has a 40V Vdss rating, which exceeds the 20V requirement. This higher voltage rating does not prevent operation in 20V circuits; however, the reduced continuous drain current (75A versus 92A) must be evaluated against circuit requirements. Applications operating near the 92A limit may require thermal or current management adjustments.

Q: What are the thermal implications of switching from IRF3711ZCSTRR to BUK9609-40B,118?

A: Both devices have identical maximum power dissipation ratings of 79W at Tc. However, BUK9609-40B,118 has higher Rds On (7mOhm versus 6mOhm), resulting in increased conduction losses at equivalent current levels. Thermal management design must account for this increased power dissipation in high-current applications.

Q: Are there compliance differences between the substitute parts?

A: Yes. IRF3711ZCSTRR is RoHS non-compliant. Both IRFR3711ZTRPBF and BUK9609-40B,118 are ROHS3 compliant. BUK9609-40B,118 additionally carries AEC-Q101 automotive qualification. Applications subject to RoHS or automotive requirements must use compliant substitutes.

Q: Which substitute offers the best long-term supply chain security?

A: BUK9609-40B,118 is classified as Active, indicating ongoing production and support. IRFR3711ZTRPBF is rated "Not For New Designs," suggesting limited future availability. For applications requiring extended production life, BUK9609-40B,118 provides superior supply chain continuity.

Q: How do gate charge differences affect circuit design?

A: IRF3711ZCSTRR has 24nC gate charge at 4.5V. IRFR3711ZTRPBF has 27nC at 4.5V, and BUK9609-40B,118 has 32nC at 5V. Higher gate charge requires greater drive current or longer switching times. Drive circuits must be verified to deliver sufficient gate current within acceptable switching frequency constraints.

Q: Can package thermal performance be considered equivalent between D2PAK and DPAK?

A: No. D2PAK and DPAK have different thermal tab sizes and lead configurations. D2PAK generally provides superior thermal performance due to larger tab area. When substituting IRFR3711ZTRPBF (DPAK) for IRF3711ZCSTRR (D2PAK), thermal analysis must be re-performed to ensure adequate heat dissipation in the target application.