IRF7331PBF Equivalent & Substitute Parts

Part Overview

The IRF7331PBF is a dual N-channel MOSFET array manufactured by Infineon Technologies, configured as a 2N-channel logic level gate device rated for 20V drain-to-source voltage and 7A continuous drain current. The device is housed in an 8-SOIC surface mount package and features a maximum power dissipation of 2W across an operating temperature range of -55°C to 150°C. The IRF7331PBF is part of the HEXFET® series and is ROHS3 compliant with MSL 1 moisture sensitivity rating.

The IRF7331PBF has been discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute devices must maintain compatibility across electrical parameters, package form factor, and regulatory compliance standards.

Substiute Parts

IRF7331PBF

Infineon TechnologiesIn Stock: 25210IRF7331PBF Datasheet

Current PartRFQ

FDS9926A

onsemiIn Stock: 74335FDS9926A Datasheet

MFR RecommendedRFQ

ZXMN2A04DN8TA

Diodes IncorporatedIn Stock: 6823ZXMN2A04DN8TA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF7331PBF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Configuration: 2 N-Channel (Dual) MOSFET array
• Drain to Source Voltage (Vdss): 20V minimum
• Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width
• Mounting Type: Surface Mount
• FET Feature: Logic Level Gate operation
• Operating Temperature Range: -55°C to 150°C minimum
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

Performance Parameters for Substitution:

• Continuous Drain Current (Id): Minimum 5.9A (acceptable tolerance below 7A specification)
• Rds On (Max): 30 mOhm or lower at rated conditions
• Gate Threshold Voltage (Vgs(th)): Logic level compatible (≤1.5V @ 250µA)

The substitute parts FDS9926A and ZXMN2A04DN8TA meet all mandatory matching criteria and maintain electrical performance within acceptable operating margins for the IRF7331PBF application space.

Parameter Comparison

Engineering Selection Recommendations

FDS9926A (onsemi PowerTrench®)

The FDS9926A is an active product from onsemi with 74,300 units in stock. It maintains identical Vdss (20V) and Rds On (30 mOhm) specifications to the IRF7331PBF. The continuous drain current rating of 6.5A represents a 7.1% reduction from the original 7A specification. Gate charge is significantly lower at 9nC compared to 20nC, resulting in faster switching characteristics. Input capacitance is reduced to 650pF, improving high-frequency performance. Maximum power dissipation is 900mW, lower than the original 2W rating. The device is ROHS3 compliant with MSL 1 rating and maintains the identical 8-SOIC package form factor. This substitute is suitable for applications where the reduced current rating and power dissipation do not exceed design margins.

ZXMN2A04DN8TA (Diodes Incorporated)

The ZXMN2A04DN8TA is an active product from Diodes Incorporated with 6,768 units in stock. It maintains identical Vdss (20V) and provides superior Rds On performance at 25 mOhm compared to the original 30 mOhm specification. The continuous drain current rating of 5.9A represents a 15.7% reduction from the original 7A specification. Gate threshold voltage is lower at 700mV minimum, providing improved logic level gate compatibility. Gate charge is comparable at 22.1nC. Input capacitance is higher at 1880pF, which may impact switching speed in high-frequency applications. Maximum power dissipation is 1.8W, closer to the original 2W rating. The device is ROHS3 compliant with MSL 1 rating and maintains the identical 8-SOIC package form factor. This substitute is suitable for applications where lower on-resistance and higher power dissipation capability are beneficial.

Selection Basis:

Both substitute parts satisfy mandatory regulatory compliance (ROHS3, MSL 1), package compatibility (8-SOIC), and electrical configuration requirements (2 N-Channel, 20V, Logic Level Gate, -55°C to 150°C). Selection between FDS9926A and ZXMN2A04DN8TA depends on application-specific requirements regarding current capacity, power dissipation, and switching characteristics. Both devices are currently in active production status with substantial inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the FDS9926A directly replace the IRF7331PBF in all applications?

A: The FDS9926A is electrically compatible with the IRF7331PBF across all mandatory parameters (Vdss, package, configuration, temperature range, compliance). However, the continuous drain current is rated at 6.5A versus 7A for the original device. Applications operating at or near the 7A specification limit require verification that the 6.5A rating does not exceed design margins. The reduced maximum power dissipation (900mW versus 2W) must also be evaluated for thermal management compatibility.

Q: What are the key differences between FDS9926A and ZXMN2A04DN8TA?

A: Both devices maintain 20V Vdss and 8-SOIC package compatibility. FDS9926A offers lower gate charge (9nC) and input capacitance (650pF), resulting in faster switching response. ZXMN2A04DN8TA provides superior on-resistance (25 mOhm versus 30 mOhm) and higher maximum power dissipation (1.8W versus 900mW). FDS9926A is optimized for high-frequency switching applications; ZXMN2A04DN8TA is optimized for lower on-resistance and power handling. Continuous drain current ratings differ: FDS9926A at 6.5A, ZXMN2A04DN8TA at 5.9A.

Q: Are the substitute parts pin-compatible with the IRF7331PBF?

A: All three devices use the 8-SOIC package with identical 0.154" (3.90mm) width. Pin compatibility is determined by internal die configuration and gate drive requirements. The provided specifications confirm that FDS9926A and ZXMN2A04DN8TA maintain the same dual N-channel configuration and logic level gate feature as the IRF7331PBF. Physical footprint compatibility is confirmed; functional pin mapping must be verified against specific application schematics.

Q: What is the impact of lower continuous drain current ratings on circuit performance?

A: The FDS9926A (6.5A) and ZXMN2A04DN8TA (5.9A) have lower continuous drain current ratings than the IRF7331PBF (7A). In applications where sustained current approaches or exceeds the substitute device rating, thermal stress and potential device failure may occur. Circuit design must ensure that actual operating current remains below the substitute device's continuous drain current specification with appropriate safety margin. Thermal management and duty cycle analysis are required for applications near the current limit.

Q: Are all substitute parts ROHS3 compliant and MSL 1 rated?

A: Yes. Both FDS9926A and ZXMN2A04DN8TA are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original IRF7331PBF specifications. This ensures regulatory compliance and eliminates moisture sensitivity concerns during storage and handling.

Q: What is the significance of gate charge differences between the three devices?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The IRF7331PBF specifies 20nC at 4.5V, FDS9926A specifies 9nC at 4.5V, and ZXMN2A04DN8TA specifies 22.1nC at 5V. Lower gate charge (FDS9926A) enables faster switching and reduced driver power consumption. Higher gate charge (ZXMN2A04DN8TA) may require stronger gate drive circuits but provides more robust switching behavior. Gate drive circuit design must accommodate the substitute device's gate charge specification.

Q: How do input capacitance differences affect circuit design?

A: Input capacitance (Ciss) affects switching speed and gate drive requirements. The IRF7331PBF specifies 1340pF at 16V, FDS9926A specifies 650pF at 10V, and ZXMN2A04DN8TA specifies 1880pF at 10V. Lower capacitance (FDS9926A) enables faster switching transitions and reduced gate drive power. Higher capacitance (ZXMN2A04DN8TA) may slow switching transitions and increase gate drive requirements. High-frequency applications benefit from lower input capacitance; low-frequency applications are less sensitive to this parameter.