IRF7831TR N-Channel 30V 21A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF7831TR is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 21A continuous drain current at 25°C. This device is packaged in an 8-SOIC surface mount configuration and belongs to the HEXFET® series. The IRF7831TR is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal characteristics while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	21	A
On-State Resistance (Rds On) @ 20A, 10V	3.6	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.35	V
Gate Charge (Qg) @ 4.5V	60	nC
Input Capacitance (Ciss) @ 15V	6240	pF
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-SOIC	-
FET Type	N-Channel	-

Substitute Part Grouping Explanation

Substitution for the IRF7831TR is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id): Must equal or exceed 21A at 25°C
On-State Resistance (Rds On): Must not exceed 3.6mOhm @ 20A, 10V to maintain thermal performance
Gate Threshold Voltage (Vgs(th)): Must be within ±0.5V of 2.35V for gate drive compatibility
Package Type: Must be 8-SOIC surface mount configuration
Operating Temperature: Must support -55°C to 150°C range

Substitute Categories:

Category 1 - Direct Electrical Equivalents (Same Current Rating): Parts maintaining 21A continuous drain current with identical or superior electrical characteristics and active product status.

Category 2 - Reduced Current Equivalents (Lower Current Rating): Parts with reduced continuous drain current (16-17A) but maintaining 30V Vdss rating. These are suitable only when application current requirements do not exceed the substitute part's rating.

Category 3 - Parametric Equivalents (Same Series, Obsolete Status): Parts with identical electrical specifications but different packaging or compliance status, suitable for legacy design continuity.

Parameter Comparison

Parameter	IRF7831TR (Main)	IRF7862TRPBF	IRF7831TRPBF	BSO033N03MSGXUMA1	BSO040N03MSGXUMA1
Manufacturer	Infineon	Infineon	Infineon	Infineon	Infineon
Vdss (V)	30	30	30	30	30
Id @ 25°C (A)	21	21	21	17	16
Rds On @ 20A, 10V (mOhm)	3.6	3.7	3.6	3.3	4.0
Vgs(th) @ 250µA (V)	2.35	2.35	2.35	2.0	2.0
Qg @ Vgs (nC)	60 @ 4.5V	45 @ 4.5V	60 @ 4.5V	124 @ 10V	73 @ 10V
Ciss @ 15V (pF)	6240	4090	6240	9600	5700
Power Dissipation (W)	2.5	2.5	2.5	1.56	1.56
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Series	HEXFET®	HEXFET®	HEXFET®	OptiMOS™	OptiMOS™
Product Status	Obsolete	Active	Not For New Designs	Not For New Designs	Not For New Designs
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Active Production (Recommended Primary Substitute):

IRF7862TRPBF is the preferred substitute for the obsolete IRF7831TR. This part maintains identical electrical specifications (30V, 21A, 2.5W) and package configuration (8-SOIC). IRF7862TRPBF holds Active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), meeting modern environmental and reliability standards. Gate charge is reduced to 45nC at 4.5V compared to 60nC, resulting in improved switching efficiency. Input capacitance is reduced to 4090pF, providing faster gate response characteristics.

For Legacy Design Continuity (Parametric Equivalent):

IRF7831TRPBF provides identical electrical and thermal characteristics to the main part (30V, 21A, 3.6mOhm Rds On, 2.5W dissipation). This part is classified as Not For New Designs but maintains ROHS3 compliance and MSL 1 rating. Use this substitute only when design validation has been completed on the original IRF7831TR and direct parametric equivalence is required.

For Current-Reduced Applications:

BSO033N03MSGXUMA1 and BSO040N03MSGXUMA1 are OptiMOS™ series alternatives suitable only for applications where continuous drain current requirements do not exceed 17A and 16A respectively. These parts offer improved on-state resistance characteristics (3.3mOhm and 4.0mOhm) but reduced power dissipation (1.56W). Both parts are ROHS3 compliant with MSL 3 rating (168-hour moisture sensitivity). Gate threshold voltage is reduced to 2.0V, requiring gate drive circuit verification. These substitutes are classified as Not For New Designs.

Compliance Considerations:

The IRF7831TR is RoHS non-compliant. All recommended substitutes (IRF7862TRPBF, IRF7831TRPBF, BSO033N03MSGXUMA1, BSO040N03MSGXUMA1) are ROHS3 compliant, meeting current environmental regulations. MSL ratings differ: IRF7862TRPBF and IRF7831TRPBF maintain MSL 1 (unlimited), while OptiMOS™ variants require MSL 3 handling (168-hour limit). Verify storage and assembly conditions accordingly.

Frequently Asked Questions (FAQ)

Q1: Can IRF7862TRPBF directly replace IRF7831TR without circuit modification?

A: Yes. IRF7862TRPBF maintains identical electrical specifications (30V Vdss, 21A Id, 2.5W power dissipation) and 8-SOIC package configuration. Gate charge is reduced (45nC vs. 60nC), which improves switching performance without requiring circuit changes. The part is pin-compatible and electrically interchangeable.

Q2: What is the difference between IRF7862TRPBF and IRF7831TRPBF?

A: Both parts maintain identical electrical ratings (30V, 21A, 3.6mOhm Rds On). The primary difference is product status: IRF7862TRPBF is Active (recommended for new designs), while IRF7831TRPBF is Not For New Designs. IRF7862TRPBF also features reduced gate charge (45nC vs. 60nC) and input capacitance (4090pF vs. 6240pF), providing superior switching characteristics. For new production, IRF7862TRPBF is the preferred choice.

Q3: Can BSO033N03MSGXUMA1 or BSO040N03MSGXUMA1 be used as direct substitutes?

A: These parts are suitable only if application current requirements do not exceed 17A (BSO033N03MSGXUMA1) or 16A (BSO040N03MSGXUMA1). Both maintain 30V Vdss rating and 8-SOIC packaging. However, gate threshold voltage is reduced to 2.0V (vs. 2.35V), requiring gate drive circuit verification. Gate charge and input capacitance differ significantly, potentially affecting switching behavior. These are Not For New Designs and should be used only for legacy applications with validated current requirements below their ratings.

Q4: What are the packaging differences between these substitutes?

A: All substitutes use 8-SOIC (0.154", 3.90mm width) surface mount packaging, matching the original IRF7831TR. Packaging variants differ in tape format: IRF7862TRPBF is supplied in Tape & Reel (TR), IRF7831TRPBF in Cut Tape (CT) & Digi-Reel®, and OptiMOS™ variants in Tape & Reel (TR). These differences affect supply chain logistics but do not impact electrical or mechanical compatibility.

Q5: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: IRF7862TRPBF and IRF7831TRPBF carry MSL 1 (unlimited moisture sensitivity), allowing indefinite storage without desiccant protection. BSO033N03MSGXUMA1 and BSO040N03MSGXUMA1 carry MSL 3 (168-hour limit), requiring controlled storage conditions and bake-out procedures before assembly. Verify your manufacturing environment and storage capabilities before selecting OptiMOS™ variants.

Q6: Are all substitutes RoHS compliant?

A: Yes. IRF7862TRPBF, IRF7831TRPBF, BSO033N03MSGXUMA1, and BSO040N03MSGXUMA1 are all ROHS3 compliant. The original IRF7831TR is RoHS non-compliant. Substitution to any of these parts ensures compliance with current environmental regulations (EU Directive 2011/65/EU as amended).

Q7: Which substitute offers the best thermal performance?

A: IRF7862TRPBF and IRF7831TRPBF maintain the original 2.5W power dissipation rating. BSO033N03MSGXUMA1 and BSO040N03MSGXUMA1 are rated for 1.56W, indicating reduced thermal load. However, the lower current ratings (17A and 16A) of OptiMOS™ variants mean they operate at lower power levels in applications designed for 21A. For applications requiring full 21A operation, IRF7862TRPBF or IRF7831TRPBF maintain equivalent thermal performance to the original part.

Q8: What is the inventory status of these substitutes?

A: IRF7862TRPBF has 22,232 pieces in stock (Active status ensures continued availability). IRF7831TRPBF has 7,730 pieces available. BSO033N03MSGXUMA1 has 22,695 pieces in stock. BSO040N03MSGXUMA1 has 3,176 pieces in stock. Verify current inventory with your supplier, as stock levels change continuously.

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