RFP45N06 Equivalent & Substitute Parts

Part Overview

The RFP45N06 is an N-Channel MOSFET manufactured by onsemi, rated for 60V drain-to-source voltage and 45A continuous drain current in a Through Hole TO-220-3 package. This device is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The RFP45N06 is suitable for applications requiring moderate-to-high current switching at 60V operating levels.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	45	A
On-State Resistance (Rds On) @ 45A, 10V	28	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 20V	150	nC
Power Dissipation (Max)	131	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the RFP45N06 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 60V
Continuous Drain Current (Id): Must equal or exceed 45A at 25°C
On-State Resistance (Rds On): Must not exceed 28mOhm at rated current and gate voltage
Gate Threshold Voltage (Vgs(th)): Must be compatible at 4V nominal
Package Type: Must be Through Hole TO-220 variant
FET Type: N-Channel MOSFET technology

Acceptable Variations:

Gate Charge (Qg) may vary within application-dependent limits
Power Dissipation (Max) may exceed the original specification
Operating Temperature maximum may vary (minimum -55°C required)
Input Capacitance (Ciss) variations are acceptable if within thermal and switching performance requirements

Substitute parts are grouped into two categories: Direct Equivalents (matching or exceeding all primary criteria with minimal parameter variance) and Enhanced Substitutes (exceeding primary criteria with improved performance characteristics).

Parameter Comparison

Parameter	RFP45N06	STP45NF06	IRFZ40PBF	IRFZ44PBF	IRFZ44RPBF	IXTP80N075L2
Manufacturer	onsemi	STMicroelectronics	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	IXYS
Product Status	Obsolete	Active	Active	Active	Active	Active
Vdss (V)	60	60	60	60	60	75
Id @ 25°C (A)	45	38	50	50	50	80
Rds On (mOhm)	28 @ 45A, 10V	28 @ 19A, 10V	28 @ 31A, 10V	28 @ 31A, 10V	28 @ 31A, 10V	24 @ 40A, 10V
Vgs(th) @ 250µA (V)	4	4	4	4	4	4.5
Qg @ Vgs (nC)	150 @ 20V	58 @ 10V	67 @ 10V	67 @ 10V	67 @ 10V	103 @ 10V
Vgs (Max) (V)	±20	±20	±20	±20	±20	±20
Ciss @ 25V (pF)	2050	980	1900	1900	1900	3600
Power Dissipation (W)	131	80	150	150	150	357
Operating Temperature (°C)	-55 to 175	to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 150
Package	TO-220-3	TO-220	TO-220AB	TO-220AB	TO-220AB	TO-220-3
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Substitutes (60V, ≥45A Category):

The IRFZ40PBF, IRFZ44PBF, and IRFZ44RPBF from Vishay Siliconix are functionally equivalent to the RFP45N06. All three devices are rated for 60V Vdss and 50A continuous drain current, exceeding the original 45A specification. These parts maintain identical on-state resistance (28mOhm) and gate threshold voltage (4V) characteristics. All three are Active products with ROHS3 compliance, providing long-term availability and regulatory support. The IRFZ44RPBF offers the highest inventory level (5420 units) among this group.

Enhanced Performance Substitute (75V, 80A Category):

The IXTP80N075L2 from IXYS represents an enhanced substitute with superior current handling (80A) and voltage rating (75V). This device features improved on-state resistance (24mOhm) and significantly higher power dissipation capability (357W). The IXTP80N075L2 is suitable for applications requiring higher current margins or elevated voltage headroom. This part is Active with ROHS3 compliance. The maximum operating temperature is 150°C, which is 25°C lower than the RFP45N06 specification.

Lower Current Alternative (60V, 38A Category):

The STP45NF06 from STMicroelectronics is rated for 60V Vdss and 38A continuous drain current, which is below the original 45A specification. This device is suitable only for applications where the actual current requirement does not exceed 38A. The STP45NF06 features lower gate charge (58nC) and input capacitance (980pF), resulting in faster switching characteristics. This part is Active with ROHS3 compliance and offers high inventory availability (8822 units).

Selection Basis:

All substitute parts share identical ECCN (EAR99), HTSUS code (8541.29.0095), and Moisture Sensitivity Level (MSL 1 - Unlimited) classifications with the original RFP45N06. All substitute parts are REACH Unaffected. Selection should prioritize Active status products (all listed substitutes) over the Obsolete RFP45N06 to ensure long-term supply chain stability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ40PBF, IRFZ44PBF, or IRFZ44RPBF directly replace the RFP45N06 in existing designs?

A: Yes. All three Vishay devices are direct substitutes. They maintain the same 60V voltage rating, exceed the 45A current requirement at 50A, and match the 28mOhm on-state resistance. All are packaged in TO-220 variants compatible with TO-220-3 footprints. The primary difference is gate charge specification (67nC versus 150nC), which may affect switching speed in gate-drive-limited applications.

Q: What is the difference between IRFZ40PBF, IRFZ44PBF, and IRFZ44RPBF?

A: These three parts are electrically identical with matching electrical specifications. The designations reflect different manufacturing batches or packaging variants. IRFZ44RPBF offers the highest current inventory (5420 units), making it the preferred choice for procurement continuity.

Q: Is the IXTP80N075L2 a suitable replacement for the RFP45N06?

A: The IXTP80N075L2 is functionally compatible but represents an enhanced substitute rather than a direct equivalent. It provides higher voltage (75V) and current (80A) ratings with improved on-state resistance (24mOhm). However, the maximum operating temperature is 150°C versus 175°C for the RFP45N06. Use this device only if the application benefits from the enhanced specifications and operates within the 150°C temperature limit.

Q: Why is the STP45NF06 listed as a substitute if it is rated for only 38A?

A: The STP45NF06 is included as a lower-current alternative for applications where actual drain current does not exceed 38A. It offers advantages in switching speed due to lower gate charge (58nC) and input capacitance (980pF). This device is not suitable for applications requiring the full 45A capability of the RFP45N06.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original RFP45N06 does not specify RoHS status. All substitutes are REACH Unaffected and share identical ECCN and HTSUS classifications.

Q: What is the impact of different gate charge specifications on circuit performance?

A: Gate charge (Qg) affects the speed at which the MOSFET switches on and off. The RFP45N06 specifies 150nC at 20V, while the Vishay substitutes specify 67nC at 10V. Lower gate charge enables faster switching and reduces gate driver power dissipation. Applications with fixed gate drive circuits may experience different switching characteristics. Thermal performance and EMI behavior may also be affected.

Q: Can I use the IXTP80N075L2 in a 60V circuit designed for the RFP45N06?

A: Yes. The IXTP80N075L2 is rated for 75V, which exceeds the 60V requirement. The device operates safely in 60V circuits. However, verify that the application does not depend on the 175°C maximum operating temperature of the RFP45N06, as the IXTP80N075L2 is limited to 150°C.

Q: Are there any package compatibility issues between the RFP45N06 and its substitutes?

A: The RFP45N06 uses TO-220-3 packaging. The Vishay substitutes (IRFZ40PBF, IRFZ44PBF, IRFZ44RPBF) use TO-220AB packaging, which is mechanically and electrically compatible with TO-220-3 footprints. The IXTP80N075L2 uses TO-220-3 packaging, providing direct mechanical compatibility. The STP45NF06 uses TO-220 packaging, also compatible with TO-220-3 layouts. All substitutes are suitable for Through Hole mounting applications.

Q: What inventory considerations should guide my selection?

A: The IRFZ40PBF offers the highest inventory (10265 units), followed by STP45NF06 (8822 units) and IRFZ44RPBF (5420 units). For applications requiring immediate availability and long-term supply security, prioritize parts with higher inventory levels. All listed substitutes are Active products, ensuring continued manufacturing and support.

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