IRFBF30 N-Channel MOSFET 900V 3.6A TO-220AB Equivalent & Substitute Parts

Part Overview

The IRFBF30 is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 900V drain-to-source voltage with 3.6A continuous drain current at 25°C. This device is housed in a TO-220AB through-hole package and is designed for high-voltage switching applications requiring 125W power dissipation capability. The part is currently Active in product status with 2000 pieces in stock inventory.

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatible mechanical packaging. Substitutes are necessary when the primary part reaches end-of-life, inventory constraints occur, or when design requirements allow for enhanced performance specifications.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	900	V
Current - Continuous Drain (Id) @ 25°C	3.6	A (Tc)
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	3.7	Ohm @ 2.2A, 10V
Power Dissipation (Max)	125	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution logic for the IRFBF30 is based on the following critical parameters:

Voltage Rating (Vdss): Substitute parts must meet or exceed 900V. Parts rated at 1000V are acceptable as they provide additional voltage margin without compromising application compatibility.

Continuous Drain Current (Id): Substitute parts must support a minimum of 3.6A at 25°C. Parts rated at 3A, 3.5A, 4A, or 5.8A are acceptable depending on thermal design requirements.

On-State Resistance (Rds On): Substitute parts must maintain comparable or lower on-state resistance at the specified gate voltage (10V) to ensure equivalent switching performance and thermal characteristics.

Power Dissipation: Substitute parts rated at 90W, 125W, 140W, or 150W are acceptable, with higher ratings providing additional thermal headroom.

Package Compatibility: All substitute parts must use TO-220-3 or TO-220AB through-hole packaging to ensure mechanical and thermal interface compatibility.

Operating Temperature: All substitute parts must support the -55°C to 150°C operating range.

Substitutes are grouped into two categories: Parametric Equivalents (identical electrical specifications with different packaging or compliance status) and Manufacturer Recommended Alternatives (enhanced or comparable performance with different voltage or current ratings).

Parameter Comparison

Parameter	IRFBF30	IRFBF30PBF	IXFP4N100Q	IXTP3N100P	STP3NK90Z	STP5NK100Z	STP6NK90Z
Manufacturer	Vishay Siliconix	Vishay Siliconix	IXYS	IXYS	STMicroelectronics	STMicroelectronics	STMicroelectronics
Vdss (V)	900	900	1000	1000	900	1000	900
Id @ 25°C (A)	3.6	3.6	4	3	3	3.5	5.8
Rds On (Max) @ 10V (Ohm)	3.7 @ 2.2A	3.7 @ 2.2A	3 @ 2A	4.8 @ 1.5A	4.8 @ 1.5A	3.7 @ 1.75A	2 @ 2.9A
Power Dissipation (Max) (W)	125	125	150	125	90	125	140
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Active	Active	Not For New Designs	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRFBF30PBF (Vishay Siliconix): This part is a direct parametric equivalent to the IRFBF30, offering identical electrical specifications (900V, 3.6A, 125W) with the same TO-220-3 package. The primary distinction is RoHS3 compliance status and tube packaging. This substitute is suitable for applications requiring regulatory compliance with environmental standards. Product status is Active with 15,411 pieces in inventory.

IXFP4N100Q (IXYS): This part provides enhanced voltage rating (1000V) and current capability (4A) with improved on-state resistance (3Ohm @ 2A) and higher power dissipation (150W). However, product status is listed as "Not For New Designs," limiting its suitability for new development. This substitute is applicable only for legacy system maintenance or replacement scenarios where existing designs already incorporate this device.

IXTP3N100P (IXYS): This part offers 1000V voltage rating with 3A continuous current and 125W power dissipation, maintaining compatibility with the original 125W thermal specification. On-state resistance is 4.8Ohm @ 1.5A, which is higher than the IRFBF30. Product status is Active with ROHS3 compliance. This substitute is suitable for applications where higher voltage margin is required without exceeding thermal constraints.

STP3NK90Z (STMicroelectronics): This part maintains the 900V voltage rating with 3A continuous current and 90W power dissipation. On-state resistance is 4.8Ohm @ 1.5A. Product status is Active with ROHS3 compliance and 41,469 pieces in inventory. This substitute is applicable for applications where thermal dissipation is not a limiting factor and cost optimization is prioritized.

STP5NK100Z (STMicroelectronics): This part provides 1000V voltage rating with 3.5A continuous current and 125W power dissipation, matching the thermal specification of the IRFBF30. On-state resistance is 3.7Ohm @ 1.75A, providing equivalent switching performance. Product status is Active with ROHS3 compliance. This substitute is suitable for applications requiring higher voltage margin while maintaining thermal performance.

STP6NK90Z (STMicroelectronics): This part maintains the 900V voltage rating with enhanced current capability (5.8A) and 140W power dissipation. On-state resistance is 2Ohm @ 2.9A, providing superior switching efficiency. Product status is Active with ROHS3 compliance and 7,771 pieces in inventory. This substitute is applicable for applications where higher current handling or improved efficiency is required.

Frequently Asked Questions (FAQ)

Q: Can IRFBF30PBF be used as a direct replacement for IRFBF30?

A: Yes. IRFBF30PBF is a parametric equivalent with identical electrical specifications (900V, 3.6A, 125W) and the same TO-220-3 package. The primary difference is RoHS3 compliance status. Both parts are Active in product status and suitable for direct substitution in existing designs.

Q: What is the difference between 900V and 1000V rated substitutes?

A: Substitutes rated at 1000V (IXFP4N100Q, IXTP3N100P, STP5NK100Z) provide 100V additional voltage margin compared to the IRFBF30's 900V rating. This higher voltage rating does not affect circuit compatibility but provides additional safety margin in applications subject to voltage transients or overshoot conditions. All other electrical parameters remain comparable.

Q: Are there current rating differences between substitutes?

A: Yes. The IRFBF30 is rated for 3.6A continuous drain current. Substitutes range from 3A (STP3NK90Z, IXTP3N100P) to 5.8A (STP6NK90Z). Lower-rated substitutes (3A) may require thermal design review if the original application operates near the 3.6A limit. Higher-rated substitutes (3.5A, 4A, 5.8A) provide additional current margin without thermal penalty.

Q: What does "Not For New Designs" mean for IXFP4N100Q?

A: This product status indicates that IXYS has discontinued active development and marketing of this part for new applications. While the part remains available in inventory (1,380 pieces), it is intended only for legacy system support, maintenance, and replacement of existing designs. New designs should select from parts with Active product status.

Q: How do on-state resistance differences affect circuit performance?

A: On-state resistance (Rds On) directly affects switching losses and heat dissipation. The IRFBF30 has 3.7Ohm @ 2.2A, 10V. Substitutes with lower Rds On (STP6NK90Z at 2Ohm, IXFP4N100Q at 3Ohm) reduce conduction losses and improve efficiency. Substitutes with higher Rds On (STP3NK90Z, IXTP3N100P at 4.8Ohm) increase conduction losses. Selection depends on thermal budget and efficiency requirements.

Q: Are all substitutes available in the same TO-220-3 package?

A: Yes. All substitute parts listed are housed in TO-220-3 or TO-220AB through-hole packages, ensuring mechanical and thermal interface compatibility with the IRFBF30. No PCB layout modifications are required for direct substitution.

Q: Which substitute offers the best thermal performance?

A: STP6NK90Z provides the highest power dissipation rating (140W) and the lowest on-state resistance (2Ohm @ 2.9A), resulting in superior thermal efficiency. IXFP4N100Q offers 150W dissipation but is marked "Not For New Designs." For new designs, STP6NK90Z or STP5NK100Z are recommended for enhanced thermal performance.

Q: Are all substitutes RoHS3 compliant?

A: All substitutes except the original IRFBF30 are RoHS3 compliant. IRFBF30PBF is the RoHS3-compliant variant of the IRFBF30. If regulatory compliance is required, select from IRFBF30PBF, IXFP4N100Q, IXTP3N100P, STP3NK90Z, STP5NK100Z, or STP6NK90Z.

Q: What is the operating temperature range for all parts?

A: All parts, including the IRFBF30 and all substitutes, support an operating temperature range of -55°C to 150°C (TJ). This specification is consistent across all options and does not differentiate substitution suitability.

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