FQP34N20 Equivalent & Substitute Parts

Part Overview

The FQP34N20 is an N-Channel MOSFET manufactured by onsemi, rated for 200V drain-to-source voltage with 31A continuous drain current at 25°C. This device is packaged in a TO-220-3 through-hole configuration and is part of the QFET® series. The FQP34N20 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	31	A
On-State Resistance (Rds On) @ 15.5A, 10V	75	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	78	nC
Power Dissipation (Max)	180	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-220-3	—
Technology	MOSFET (Metal Oxide)	—
FET Type	N-Channel	—

Substitute Part Grouping Explanation

Substitution of the FQP34N20 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 200V
Continuous Drain Current (Id): Must equal or exceed 31A at 25°C
Package Type: Must be TO-220-3 or compatible through-hole TO-220 variant
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)

Secondary Compatibility Parameters:

On-State Resistance (Rds On): Lower values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Must support thermal requirements of the application
Operating Temperature Range: Must encompass application requirements

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent (MFR Recommended): FDP61N20 from onsemi meets all primary criteria with enhanced current rating (61A) and reduced on-state resistance (41mOhm), maintaining identical voltage rating and package type.

Similar Alternatives: IXTP32N20T, STP20NF20, and STP30NF20 meet primary electrical criteria with minor variations in secondary parameters. RCX330N25 from Rohm Semiconductor exceeds voltage rating (250V) and meets current requirements but uses a TO-220FM package variant.

Parameter Comparison

Parameter	FQP34N20	FDP61N20	IXTP32N20T	STP30NF20	STP20NF20	RCX330N25
Manufacturer	onsemi	onsemi	IXYS	STMicroelectronics	STMicroelectronics	Rohm Semiconductor
Vdss (V)	200	200	200	200	200	250
Id @ 25°C (A)	31	61	32	30	18	33
Rds On (mOhm)	75 @ 15.5A, 10V	41 @ 30.5A, 10V	72 @ 16A, 10V	75 @ 15A, 10V	125 @ 10A, 10V	—
Qg @ 10V (nC)	78	75	38	38	39	—
Power Dissipation (W)	180	417	200	125	110	40
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 175	-55 to 150	-55 to 175	—
Package	TO-220-3	TO-220-3	TO-220-3	TO-220	TO-220	TO-220FM
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FDP61N20 (onsemi): This part is the manufacturer-recommended equivalent. It maintains identical voltage rating (200V) and package type (TO-220-3) while providing doubled current capacity (61A versus 31A) and significantly reduced on-state resistance (41mOhm versus 75mOhm). Both parts are ROHS3 compliant and operate across the same temperature range (-55°C to 150°C). The FDP61N20 is currently in active production status, ensuring long-term availability and supply chain stability.

IXTP32N20T (IXYS): This part provides near-equivalent electrical performance with 32A continuous drain current and 200V voltage rating. On-state resistance is comparable at 72mOhm. The device operates across an extended temperature range (-55°C to 175°C) and is ROHS3 compliant. Package compatibility is maintained with TO-220-3 configuration. Product status is active.

STP30NF20 (STMicroelectronics): This part meets the primary electrical criteria with 30A continuous drain current and 200V voltage rating. On-state resistance matches the FQP34N20 at 75mOhm. The device is ROHS3 compliant and operates within the required temperature range (-55°C to 150°C). Package is TO-220 compatible. Product status is active with high inventory availability (15,265 units).

STP20NF20 (STMicroelectronics): This part provides reduced current capacity (18A) relative to the FQP34N20 but maintains 200V voltage rating and TO-220 package compatibility. On-state resistance is higher at 125mOhm. This option is suitable only for applications with lower current requirements. Product status is active.

RCX330N25 (Rohm Semiconductor): This part exceeds the voltage rating (250V) and meets current requirements (33A). However, the TO-220FM package represents a variant form factor. Power dissipation specification differs significantly (40W Tc). This option provides voltage margin but introduces package compatibility considerations. Product status is active.

Frequently Asked Questions (FAQ)

Q: Can the FQP34N20 be directly replaced with the FDP61N20?

A: Yes. The FDP61N20 is the manufacturer-recommended equivalent from onsemi. Both devices share identical voltage rating (200V), package type (TO-220-3), and operating temperature range (-55°C to 150°C). The FDP61N20 provides enhanced current capacity (61A versus 31A) and lower on-state resistance (41mOhm versus 75mOhm), making it a direct pin-compatible upgrade.

Q: What is the primary reason for substituting the FQP34N20?

A: The FQP34N20 is classified as obsolete. Active production has ceased, and long-term availability cannot be assured. Substitute parts listed here are in active production status and provide equivalent or superior electrical performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, matching the compliance status of the FQP34N20.

Q: Can I use STP20NF20 as a substitute if my application requires 31A continuous current?

A: No. The STP20NF20 is rated for 18A continuous drain current, which is below the FQP34N20 specification of 31A. This part is suitable only for applications with lower current requirements.

Q: What is the difference between TO-220-3 and TO-220FM packages?

A: Both are through-hole packages with three leads (Gate, Drain, Source). TO-220FM is a full-pack variant used by Rohm Semiconductor. Pin configuration and lead spacing are compatible, but mechanical mounting may differ slightly. Verify PCB footprint compatibility before substitution.

Q: Does the RCX330N25 offer any advantage over other substitutes?

A: The RCX330N25 provides a higher voltage rating (250V versus 200V), offering additional voltage margin in applications. However, it uses a TO-220FM package variant and has lower power dissipation rating (40W Tc). Verify package compatibility with your PCB design before selection.

Q: Which substitute part offers the best thermal performance?

A: The FDP61N20 provides the highest power dissipation rating (417W Tc), indicating superior thermal capability. This is followed by IXTP32N20T (200W Tc) and the original FQP34N20 (180W Tc). Selection should be based on application thermal requirements.

Q: Are there any operating temperature differences between substitute parts?

A: Yes. The IXTP32N20T and STP20NF20 operate across an extended temperature range (-55°C to 175°C) compared to the FQP34N20 (-55°C to 150°C). The FDP61N20, STP30NF20, and FQP34N20 all operate within -55°C to 150°C. Verify application temperature requirements before selection.

Q: Can I use multiple substitute parts interchangeably in the same design?

A: No. While all listed parts meet the primary electrical criteria (200V, ≥31A, N-Channel MOSFET, TO-220 package), secondary parameters such as on-state resistance, gate charge, and power dissipation vary. Select a single part number for your design and verify all electrical and thermal requirements are met.

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