WPH4003-1E N-Channel MOSFET 1700V 2.5A Equivalent & Substitute Parts

Part Overview

The WPH4003-1E is an N-Channel MOSFET manufactured by onsemi, rated for 1700V drain-to-source voltage with a continuous drain current of 2.5A at 25°C. The device is housed in a TO-3PF through-hole package and is designed for high-voltage switching applications. The WPH4003-1E is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, gate charge characteristics, and thermal performance while accommodating the through-hole TO-3PF package format.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	1700	V
Continuous Drain Current (Id) @ 25°C	2.5	A (Tc)
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	10.5	Ohm @ 1.5A, 10V
Gate Charge (Qg) (Max) @ Vgs	48	nC @ 10V
Vgs (Max)	±30	V
Input Capacitance (Ciss) (Max) @ Vds	850	pF @ 30V
Power Dissipation (Max)	3 (Ta), 55 (Tc)	W
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-3P-3 Full Pack	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the WPH4003-1E are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following parameters:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 1700V
Package Type: Must be TO-3PF through-hole configuration
FET Type: N-Channel MOSFET technology
Continuous Drain Current (Id): Must support minimum 2.5A at 25°C
Gate Voltage Rating (Vgs Max): Must accommodate ±30V
Mounting: Through-hole only

Secondary Compatibility Parameters:

Drive Voltage: 10V gate drive compatibility
Gate Charge (Qg): Lower values indicate improved switching performance
Input Capacitance (Ciss): Affects gate drive requirements
Power Dissipation: Thermal performance at case temperature (Tc)
RoHS and REACH Compliance: Environmental regulatory alignment

The STFW3N170 from STMicroelectronics meets all critical matching parameters and is classified as an active product, providing long-term availability and design support advantages over the obsolete WPH4003-1E.

Parameter Comparison

Parameter	WPH4003-1E (onsemi)	STFW3N170 (STMicroelectronics)	Unit
Drain-to-Source Voltage (Vdss)	1700	1700	V
Continuous Drain Current (Id) @ 25°C	2.5	2.6	A (Tc)
Drive Voltage (Max Rds On)	10	10	V
Rds On (Max) @ Id, Vgs	10.5 @ 1.5A, 10V	13 @ 1.3A, 10V	Ohm
Gate Charge (Qg) (Max) @ Vgs	48 @ 10V	44 @ 10V	nC
Vgs (Max)	±30	±30	V
Input Capacitance (Ciss) (Max) @ Vds	850 @ 30V	1100 @ 100V	pF
Power Dissipation (Max)	55 (Tc)	63 (Tc)	W
Operating Temperature (TJ)	150	-55 to 150	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-3P-3 Full Pack	TO-3P-3 Full Pack	—
Product Status	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The STFW3N170 is a direct substitute for the WPH4003-1E based on electrical and mechanical compatibility. Key selection factors include:

Product Status Advantage: The STFW3N170 is classified as an active product with 18,750 units in stock, whereas the WPH4003-1E is obsolete. Active product status ensures continued availability, technical support, and manufacturing consistency for new designs and production runs.

Electrical Compatibility: Both devices share identical voltage ratings (1700V Vdss) and gate voltage specifications (±30V Vgs Max). The STFW3N170 provides slightly higher continuous drain current (2.6A versus 2.5A) and superior power dissipation capability (63W Tc versus 55W Tc), making it suitable for applications requiring thermal headroom.

Package Compatibility: Both parts use the TO-3P-3 Full Pack configuration in TO-3PF through-hole format, ensuring direct mechanical and electrical pin compatibility without PCB redesign.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for industrial and commercial applications.

Thermal Performance: The STFW3N170 offers extended operating temperature range (-55°C to 150°C junction temperature) compared to the WPH4003-1E (150°C maximum), providing improved performance in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the STFW3N170 be used as a direct replacement for the WPH4003-1E in existing designs?

A: Yes. The STFW3N170 is electrically and mechanically compatible with the WPH4003-1E. Both devices share identical TO-3PF package pinouts, 1700V voltage ratings, and ±30V gate voltage specifications. No PCB modifications are required for substitution.

Q: What are the key electrical differences between these two devices?

A: The STFW3N170 provides 2.6A continuous drain current versus 2.5A for the WPH4003-1E, and offers higher power dissipation (63W Tc versus 55W Tc). Gate charge is slightly lower on the STFW3N170 (44 nC versus 48 nC), indicating marginally faster switching characteristics. On-resistance (Rds On) is slightly higher on the STFW3N170 (13 Ohm versus 10.5 Ohm), which may affect conduction losses in high-current applications.

Q: Why is the STFW3N170 recommended over the WPH4003-1E?

A: The STFW3N170 is an active product with established supply chain availability, whereas the WPH4003-1E is obsolete. Active product status ensures long-term technical support, consistent manufacturing quality, and reliable sourcing for production and maintenance applications.

Q: Are there any thermal performance considerations when substituting these parts?

A: The STFW3N170 supports an extended operating temperature range (-55°C to 150°C) compared to the WPH4003-1E (150°C maximum). The STFW3N170 also provides higher power dissipation capability (63W Tc), offering improved thermal performance in demanding applications. Both devices are suitable for standard industrial temperature ranges.

Q: Do both devices meet the same regulatory and compliance standards?

A: Yes. Both the WPH4003-1E and STFW3N170 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for industrial and commercial applications.

Q: What is the impact of the higher input capacitance (Ciss) on the STFW3N170?

A: The STFW3N170 has higher input capacitance (1100 pF @ 100V versus 850 pF @ 30V on the WPH4003-1E). Higher input capacitance increases gate drive current requirements and may slightly increase switching losses. Gate drive circuits must be verified to supply adequate current for reliable switching performance.

Q: Are there any on-resistance (Rds On) considerations for high-current applications?

A: The STFW3N170 has slightly higher on-resistance (13 Ohm @ 1.3A, 10V versus 10.5 Ohm @ 1.5A, 10V on the WPH4003-1E). In applications operating near maximum current ratings, this difference may result in marginally higher conduction losses. Thermal analysis should confirm acceptable performance within the application's power budget.

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