IRF7902PBF Equivalent & Substitute Parts

Part Overview

The IRF7902PBF is a dual N-channel MOSFET array manufactured by Infineon Technologies, designed for surface mount applications requiring logic level gate control at 30V drain-source voltage ratings. This component integrates two N-channel MOSFETs in an 8-SOIC package with continuous drain current ratings of 6.4A and 9.7A per channel.

The IRF7902PBF is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

IRF7902PBF

Infineon TechnologiesIn Stock: 1135IRF7902PBF Datasheet

Current PartRFQ

AO4842

Alpha & Omega Semiconductor Inc.In Stock: 210280AO4842 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF7902PBF is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain to Source Voltage (Vdss): 30V minimum
• Configuration: 2 N-Channel (Dual) MOSFET array
• Package: 8-SOIC surface mount form factor
• FET Feature: Logic Level Gate operation
• Operating Temperature Range: -55°C to 150°C minimum
• Rds On (Max): 22.6 mOhm or lower @ specified Id and Vgs conditions
• Continuous Drain Current (Id): 6.4A or higher @ 25°C

Substitute Part Identified:

The AO4842 manufactured by Alpha & Omega Semiconductor Inc. meets the primary substitution criteria. This part maintains the same 30V Vdss rating, dual N-channel configuration, 8-SOIC package geometry, logic level gate feature, and operating temperature range as the IRF7902PBF. The Rds On specification of 22 mOhm @ 7.5A, 10V is within acceptable tolerance relative to the IRF7902PBF specification of 22.6 mOhm @ 6.4A, 10V.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The AO4842 is a direct functional substitute for the IRF7902PBF based on matched electrical specifications and identical package geometry. Both components share the same 30V Vdss rating, dual N-channel configuration, 8-SOIC surface mount package, and logic level gate operation.

Compliance and Status Considerations:

The IRF7902PBF is classified as Obsolete, indicating discontinued manufacturing and limited availability. The AO4842 is classified as Not For New Designs, indicating restricted use for new applications but potential availability for replacement and maintenance purposes.

The AO4842 holds ROHS3 compliance certification, whereas the IRF7902PBF compliance status is not specified in the provided data. Both components are REACH Unaffected and carry EAR99 ECCN classification.

Inventory and Supply:

The IRF7902PBF shows 1,124 pieces in current stock. The AO4842 shows significantly higher inventory at 210,200 pieces, providing improved supply chain availability for substitution applications.

Parameter Tolerance Assessment:

The Rds On specification of the AO4842 (22 mOhm @ 7.5A, 10V) is lower than the IRF7902PBF (22.6 mOhm @ 6.4A, 10V), indicating improved on-resistance performance. The gate charge specification of the AO4842 (11 nC @ 10V) is higher than the IRF7902PBF (6.9 nC @ 4.5V), reflecting differences in measurement conditions. The input capacitance of the AO4842 (448 pF @ 15V) is lower than the IRF7902PBF (580 pF @ 15V).

These parameter variations remain within acceptable engineering tolerances for dual N-channel MOSFET array applications operating at 30V with logic level gate control.

Frequently Asked Questions (FAQ)

Q: Can the AO4842 be used as a direct replacement for the IRF7902PBF in existing designs?

A: The AO4842 meets the primary electrical and mechanical substitution criteria for the IRF7902PBF. Both components share identical Vdss ratings (30V), dual N-channel configuration, 8-SOIC package geometry, logic level gate operation, and operating temperature range (-55°C to 150°C). The on-resistance specifications are comparable. Direct substitution is feasible from an electrical standpoint. However, design validation should confirm that the specific parameter variations (gate charge, input capacitance, and threshold voltage) do not impact circuit performance in the target application.

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

A: Substitution compatibility for dual N-channel MOSFET arrays is determined by: (1) Drain to Source Voltage (Vdss) rating of 30V or higher, (2) Continuous Drain Current (Id) capability of 6.4A or higher, (3) On-resistance (Rds On) specification of 22.6 mOhm or lower, (4) Logic Level Gate feature for low-voltage control, and (5) Operating temperature range of -55°C to 150°C minimum. Package geometry (8-SOIC) and surface mount configuration must also match.

Q: Are there package compatibility concerns when substituting the AO4842 for the IRF7902PBF?

A: No package compatibility concerns exist. Both the IRF7902PBF and AO4842 use the 8-SOIC package with identical dimensions (0.154" width, 3.90mm). Pin configuration and footprint are compatible for direct PCB substitution. Both components are surface mount devices with MSL rating of 1 (Unlimited), indicating identical moisture sensitivity handling requirements.

Q: What is the significance of the product status difference between Obsolete and Not For New Designs?

A: The IRF7902PBF is classified as Obsolete, indicating that Infineon has discontinued manufacturing and support. The AO4842 is classified as Not For New Designs, indicating that Alpha & Omega Semiconductor restricts its use for new product development but may continue limited production for replacement and maintenance applications. For existing designs requiring component replacement, the AO4842 status is more favorable than the Obsolete status of the IRF7902PBF.

Q: How do the gate charge and input capacitance differences affect circuit performance?

A: The AO4842 exhibits higher gate charge (11 nC @ 10V versus 6.9 nC @ 4.5V) and lower input capacitance (448 pF @ 15V versus 580 pF @ 15V) compared to the IRF7902PBF. These differences reflect variations in semiconductor process technology and measurement conditions between manufacturers. Gate charge affects switching speed and driver circuit requirements. Input capacitance affects high-frequency performance. Application-specific circuit analysis is required to determine whether these parameter variations impact performance in the target circuit topology.

Q: What is the inventory advantage of selecting the AO4842 as a substitute?

A: The AO4842 has 210,200 pieces in current stock compared to 1,124 pieces for the IRF7902PBF. This represents approximately 187 times greater inventory availability, providing significant supply chain advantage for production quantities and long-term component availability assurance.