IRFI730G N-Channel MOSFET 400V 3.7A TO-220-3 Equivalent & Substitute Parts

Part Overview

The IRFI730G is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage with 3.7A continuous drain current at 25°C. The device is housed in a TO-220-3 through-hole package and dissipates a maximum of 35W. The IRFI730G is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	400	V
Continuous Drain Current (Id) @ 25°C	3.7	A
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	1	Ohm @ 2.1A, 10V
Power Dissipation (Max)	35	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the IRFI730G is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 400V
Continuous Drain Current (Id): Must equal or exceed 3.7A at 25°C
Drive Voltage: Must support 10V gate drive
On-State Resistance (Rds On): Must not exceed 1Ohm at specified conditions
Power Dissipation: Must support minimum 35W thermal rating
Operating Temperature: Must span -55°C to 150°C
Mounting Type: Through-hole configuration required
Package: TO-220-3 or compatible TO-220 variant

Substitute Classification:

Parametric Equivalent: IRFI730GPBF maintains identical electrical specifications and packaging to the main part. This substitute differs only in product status (Active vs. Obsolete) and RoHS compliance level.

Manufacturer Recommended Substitute: STP11NK40ZFP provides enhanced electrical performance with higher continuous drain current (9A vs. 3.7A) and improved on-state resistance (550mOhm vs. 1Ohm). This part operates within the same voltage class and temperature range but uses a TO-220FP package variant and includes SuperMESH™ technology.

Parameter Comparison

Parameter	IRFI730G	IRFI730GPBF	STP11NK40ZFP
Manufacturer	Vishay Siliconix	Vishay Siliconix	STMicroelectronics
FET Type	N-Channel	N-Channel	N-Channel
Vdss (V)	400	400	400
Id @ 25°C (A)	3.7	3.7	9
Drive Voltage (V)	10	10	10
Rds On (Max) @ Vgs (Ohm)	1 @ 10V	1 @ 10V	0.55 @ 10V
Power Dissipation (W)	35	35	30
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150
Package	TO-220-3	TO-220-3	TO-220FP
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRFI730GPBF Selection Rationale:

IRFI730GPBF is the direct parametric equivalent of IRFI730G with identical electrical specifications and TO-220-3 packaging. This part is classified as Active product status, ensuring long-term availability and supply chain continuity. IRFI730GPBF achieves ROHS3 compliance, addressing regulatory requirements for new designs and procurement. The packaging format and pin configuration are identical, enabling direct board-level substitution without layout modification. This part is suitable for applications requiring exact electrical and mechanical compatibility with the obsolete IRFI730G.

STP11NK40ZFP Selection Rationale:

STP11NK40ZFP is a manufacturer-recommended substitute offering enhanced electrical performance within the same 400V voltage class. The part provides 9A continuous drain current, exceeding the 3.7A requirement of IRFI730G, and features improved on-state resistance of 550mOhm compared to 1Ohm. STP11NK40ZFP maintains the same operating temperature range and achieves ROHS3 compliance. The TO-220FP package is mechanically compatible with TO-220-3 applications. This part is suitable for applications where higher current capacity and lower conduction losses provide design margin or performance improvement. The reduced power dissipation rating (30W vs. 35W) requires thermal design verification for applications operating at maximum power levels.

Frequently Asked Questions (FAQ)

Q: Can IRFI730GPBF be used as a direct replacement for IRFI730G?

A: Yes. IRFI730GPBF maintains identical electrical specifications including 400V Vdss, 3.7A continuous drain current, 1Ohm Rds On, and 35W power dissipation. The TO-220-3 package is identical. The primary differences are product status (Active vs. Obsolete) and RoHS compliance level (ROHS3 vs. Non-compliant). No circuit modification or board redesign is required.

Q: What are the key differences between IRFI730G and STP11NK40ZFP?

A: Both devices operate at 400V Vdss and share the same -55°C to 150°C temperature range. STP11NK40ZFP provides higher continuous drain current (9A vs. 3.7A) and lower on-state resistance (550mOhm vs. 1Ohm). The package variant differs (TO-220FP vs. TO-220-3), though both are through-hole TO-220 formats. Power dissipation rating is lower for STP11NK40ZFP (30W vs. 35W). These differences make STP11NK40ZFP suitable for applications requiring higher current handling or lower conduction losses.

Q: Are the TO-220-3 and TO-220FP packages mechanically compatible?

A: Both packages are through-hole TO-220 variants with identical pin pitch and mounting hole spacing. TO-220FP includes a full pack isolated tab design. Mechanical board-level compatibility is maintained for standard TO-220 footprints. Pin assignment and electrical function remain consistent across both package variants.

Q: What compliance certifications apply to each part?

A: IRFI730G is RoHS non-compliant. IRFI730GPBF and STP11NK40ZFP are both ROHS3 compliant. All three parts are REACH Unaffected and classified under ECCN EAR99. For applications requiring RoHS compliance, IRFI730GPBF or STP11NK40ZFP must be selected.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring exact electrical and mechanical compatibility with IRFI730G specifications, IRFI730GPBF is the appropriate selection. For applications where higher current capacity or improved efficiency provides design benefit, STP11NK40ZFP is the manufacturer-recommended alternative. Both parts are Active status with established supply availability.

Q: What thermal considerations apply when substituting STP11NK40ZFP for IRFI730G?

A: STP11NK40ZFP has a lower power dissipation rating (30W vs. 35W). Applications operating at maximum power levels require thermal design verification to ensure the lower rating does not compromise thermal performance. The improved on-state resistance (550mOhm vs. 1Ohm) typically reduces conduction losses, partially offsetting the lower dissipation rating in current-limited applications.

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