IRFS31N20DPBF N-Channel MOSFET 200V 31A Equivalent & Substitute Parts

Part Overview

The IRFS31N20DPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 200V drain-to-source voltage with 31A continuous drain current in D2PAK surface mount packaging. This device is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The part operates across a temperature range of -55°C to 175°C and is ROHS3 compliant with unlimited moisture sensitivity level.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	31	A
On-Resistance (Rds On) @ 18A, 10V	82	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5.5	V
Gate Charge (Qg) @ 10V	107	nC
Input Capacitance (Ciss) @ 25V	2370	pF
Power Dissipation (Tc)	200	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitute parts for the IRFS31N20DPBF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): 200V (exact match required)
Package Type: D2PAK surface mount (mechanical compatibility)
FET Type: N-Channel (functional requirement)
Technology: MOSFET Metal Oxide (operational principle)

Performance Parameters (within acceptable tolerance):

Continuous Drain Current (Id): 30A to 32.7A range
On-Resistance (Rds On): 45mOhm to 82mOhm at 10V drive
Gate Charge (Qg): 24nC to 107nC at 10V
Operating Temperature: Minimum -55°C to maximum 150°C or higher

Substitute parts are grouped into two categories: direct equivalents with comparable current ratings (30-32.7A) and alternative options with different current ratings that maintain voltage and package compatibility. All substitute parts listed are active products with current manufacturing status and ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ 10V (mOhm)	Qg @ 10V (nC)	Ciss @ 25V (pF)	Package	Status
IRFS31N20DPBF	Infineon	200	31	82	107	2370	D2PAK	Discontinued
PHB33NQ20T,118	Nexperia USA Inc.	200	32.7	77	32.2	1870	D2PAK	Active
FQB34N20LTM	onsemi	200	31	75	72	3900	D2PAK	Active
RCJ300N20TL	Rohm Semiconductor	200	30	80	60	3200	D2PAK	Active
STB30NF20	STMicroelectronics	200	30	75	38	1597	D2PAK	Active
STB40NF20	STMicroelectronics	200	40	45	75	2500	D2PAK	Active
STB19NF20	STMicroelectronics	200	15	160	24	800	D2PAK	Active

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

PHB33NQ20T,118 (Nexperia) and FQB34N20LTM (onsemi) are the closest electrical equivalents to the IRFS31N20DPBF. Both maintain 200V Vdss rating, deliver 31-32.7A continuous drain current, and are packaged in D2PAK. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity level. PHB33NQ20T,118 offers lower on-resistance (77mOhm) and reduced gate charge (32.2nC), while FQB34N20LTM provides identical current rating with comparable on-resistance (75mOhm).

Secondary Substitutes (Current Rating Variations):

STB30NF20 (STMicroelectronics) matches the 30A current rating with 75mOhm on-resistance and is widely available. STB40NF20 provides higher current capability (40A) with superior on-resistance (45mOhm) for applications requiring increased current headroom. Both are active STripFET™ series devices with D2PAK packaging and ROHS3 compliance.

Lower Current Alternative:

STB19NF20 (STMicroelectronics) is suitable only for applications where 15A continuous current is sufficient. This part exhibits higher on-resistance (160mOhm) and reduced gate charge (24nC), making it appropriate for lower-power switching applications within the 200V voltage class.

RCJ300N20TL (Rohm Semiconductor) provides 30A current in LPTS package variant with D2PAK compatibility. This part is active and ROHS3 compliant but operates with a maximum junction temperature of 150°C, compared to 175°C for the original IRFS31N20DPBF.

All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can PHB33NQ20T,118 directly replace IRFS31N20DPBF in all applications?

A: PHB33NQ20T,118 is electrically compatible as a direct substitute. Both parts share 200V Vdss rating, D2PAK packaging, and comparable current ratings (32.7A vs. 31A). The Nexperia part offers improved performance with lower on-resistance (77mOhm vs. 82mOhm) and reduced gate charge (32.2nC vs. 107nC). Verify gate drive voltage compatibility with your circuit design, as Vgs(th) differs (4V vs. 5.5V).

Q: What is the difference between D2PAK and LPTS packaging?

A: Both D2PAK and LPTS are surface mount packages compatible with TO-263-3 footprints. D2PAK is the standard variant used by most manufacturers listed. LPTS (Low Profile TriPak Surface) is a Rohm-specific variant with similar electrical performance but different thermal characteristics. Verify PCB layout compatibility before substitution.

Q: Why does STB40NF20 have lower on-resistance than IRFS31N20DPBF?

A: STB40NF20 is rated for 40A continuous current compared to 31A for IRFS31N20DPBF. Higher current-rated MOSFETs typically exhibit lower on-resistance due to larger die size and optimized channel design. STB40NF20 can be used in applications where the original part is specified, provided thermal management accommodates the different power dissipation profile.

Q: Is RCJ300N20TL suitable for high-temperature applications?

A: RCJ300N20TL operates to a maximum junction temperature of 150°C, compared to 175°C for IRFS31N20DPBF. For applications requiring operation above 150°C, use PHB33NQ20T,118, FQB34N20LTM, STB30NF20, STB40NF20, or STB19NF20, all rated to 150°C or higher.

Q: Can STB19NF20 replace IRFS31N20DPBF in high-current applications?

A: No. STB19NF20 is rated for only 15A continuous current, approximately half the 31A rating of IRFS31N20DPBF. This part is suitable only for applications where current requirements do not exceed 15A. For full current compatibility, use PHB33NQ20T,118, FQB34N20LTM, RCJ300N20TL, STB30NF20, or STB40NF20.

Q: What are the key electrical parameters to verify when substituting?

A: Verify Vdss (must be 200V), package type (D2PAK), continuous drain current rating (minimum 31A for direct replacement), on-resistance at 10V gate drive, gate threshold voltage compatibility with your drive circuit, and operating temperature range. Confirm gate charge and input capacitance are compatible with your gate driver circuit design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—PHB33NQ20T,118, FQB34N20LTM, RCJ300N20TL, STB30NF20, STB40NF20, and STB19NF20—are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status.

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