STW34NB20 N-Channel MOSFET 200V 34A Equivalent & Substitute Parts

Part Overview

The STW34NB20 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 200V drain-to-source voltage with 34A continuous drain current at 25°C. The device is housed in a TO-247-3 through-hole package and is part of the PowerMESH™ series. This part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The STW34NB20 operates at a maximum junction temperature of 150°C and dissipates up to 180W. With an on-state resistance (Rds On) of 75mOhm at 17A and 10V gate-source voltage, this MOSFET is suitable for switching applications requiring moderate current handling and voltage blocking capability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	34	A
On-State Resistance (Rds On) @ 17A, 10V	75	mOhm
Gate-Source Voltage (Vgs) Maximum	±30	V
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	80	nC
Input Capacitance (Ciss) @ 25V	3300	pF
Power Dissipation (Max)	180	W
Operating Junction Temperature (TJ)	150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the STW34NB20 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 34A at 25°C
Gate-Source Voltage (Vgs) Rating: Must accommodate ±30V or higher
Package Type: Must be through-hole compatible with TO-247-3 or equivalent footprint
On-State Resistance (Rds On): Lower values indicate improved performance; values at or below 75mOhm are acceptable
Operating Temperature Range: Must support minimum 150°C junction temperature

Substitute Parts Identified:

The following parts meet the substitution criteria for the STW34NB20:

IRFP250MPBF (Infineon Technologies) – 200V, 30A, TO-247AC package
IRFP250NPBF (Infineon Technologies) – 200V, 30A, TO-247AC package
IRFP250PBF (Vishay Siliconix) – 200V, 30A, TO-247-3 package
IRFP4227PBF (Infineon Technologies) – 200V, 65A, TO-247AC package
IXTQ50N20P (IXYS) – 200V, 50A, TO-3P package

Parameter Comparison

Parameter	STW34NB20	IRFP250MPBF	IRFP250NPBF	IRFP250PBF	IRFP4227PBF	IXTQ50N20P
Manufacturer	STMicroelectronics	Infineon Technologies	Infineon Technologies	Vishay Siliconix	Infineon Technologies	IXYS
Vdss (V)	200	200	200	200	200	200
Id @ 25°C (A)	34	30	30	30	65	50
Rds On (mOhm)	75 @ 17A, 10V	75 @ 18A, 10V	75 @ 18A, 10V	85 @ 18A, 10V	25 @ 46A, 10V	60 @ 50A, 10V
Vgs(th) @ 250µA (V)	5	4	4	4	5	5
Qg @ 10V (nC)	80	123	123	140	98	70
Ciss @ 25V (pF)	3300	2159	2159	2800	4600	2720
Power Dissipation (W)	180	214	214	190	330	360
TJ Max (°C)	150	175	175	150	175	175
Package	TO-247-3	TO-247AC	TO-247AC	TO-247-3	TO-247AC	TO-3P
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority):

IRFP250PBF is the primary recommended substitute. This part maintains the TO-247-3 package footprint identical to the STW34NB20, ensuring direct mechanical compatibility without PCB layout modifications. Although the continuous drain current is rated at 30A (4A lower than the original), the electrical parameters remain within acceptable operating margins for most applications. The on-state resistance of 85mOhm is marginally higher than the STW34NB20 at 75mOhm, resulting in slightly increased power dissipation. This part is actively manufactured and RoHS3 compliant.

IRFP250MPBF and IRFP250NPBF are functionally equivalent alternatives from Infineon Technologies. Both devices feature identical electrical specifications with 200V Vdss, 30A continuous drain current, and 75mOhm on-state resistance. These parts use the TO-247AC package, which is mechanically compatible with TO-247-3 footprints. Both are actively produced with extended operating temperature ranges to 175°C and RoHS3 compliance.

Higher Current Alternatives:

IRFP4227PBF provides increased current handling capability at 65A continuous drain current with superior on-state resistance of 25mOhm. This part is suitable for applications requiring higher current capacity or lower power dissipation. The TO-247AC package is mechanically compatible with the original footprint. This device is actively manufactured with RoHS3 compliance and an extended temperature range to 175°C.

IXTQ50N20P offers 50A continuous drain current in a TO-3P package with 60mOhm on-state resistance and the highest power dissipation rating at 360W. This part requires different PCB layout and mounting considerations due to the TO-3P package format. Selection of this device is appropriate only when the TO-3P package can be accommodated in the design.

Compliance and Availability:

All substitute parts are RoHS3 compliant and REACH unaffected or unaffected. All devices carry ECCN classification EAR99 and HTSUS code 8541.29.0095, matching the original part's regulatory status. Inventory availability is confirmed for all substitute parts, with IRFP4227PBF and IRFP250NPBF showing the highest stock levels.

Frequently Asked Questions (FAQ)

Q: Can the IRFP250PBF directly replace the STW34NB20 without PCB modifications?

A: Yes. The IRFP250PBF uses the TO-247-3 package, which is mechanically and electrically compatible with the STW34NB20 footprint. No PCB layout changes are required. The 4A reduction in continuous drain current (from 34A to 30A) is acceptable for most applications operating below the original current rating.

Q: What is the difference between IRFP250MPBF and IRFP250NPBF?

A: Both parts are electrically identical with 200V Vdss, 30A continuous drain current, and 75mOhm on-state resistance. The primary difference is the manufacturer's internal designation and packaging lot traceability. Both use the TO-247AC package and are functionally interchangeable.

Q: Why do some substitutes use TO-247AC instead of TO-247-3?

A: TO-247AC and TO-247-3 are mechanically compatible package variants with identical pin configurations and footprints. The "AC" designation indicates an updated package revision. Devices in TO-247AC packages can be mounted on PCBs designed for TO-247-3 without modification.

Q: Should I select IRFP4227PBF if my application requires higher current capacity?

A: IRFP4227PBF is appropriate only if your application requires continuous drain currents exceeding 34A. The 65A rating and 25mOhm on-state resistance provide superior performance in high-current switching applications. However, if your design operates at or below 34A, the lower-current alternatives (IRFP250 series) are more cost-effective and equally suitable.

Q: Is the IXTQ50N20P a viable substitute despite the different package?

A: The IXTQ50N20P is electrically compatible but requires different PCB layout and mounting hardware due to the TO-3P package. Selection of this device is limited to applications where the TO-3P package can be accommodated. The TO-247-3 and TO-247AC alternatives are preferred for direct substitution.

Q: What is the impact of higher gate charge (Qg) in substitute parts?

A: Higher gate charge increases the energy required to switch the device and may require gate driver adjustments. IRFP250PBF has 140nC gate charge compared to the STW34NB20's 80nC. This difference is manageable with standard gate drivers but may increase switching losses in high-frequency applications. IXTQ50N20P has the lowest gate charge at 70nC, offering improved switching performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts are RoHS3 compliant and carry identical REACH and ECCN classifications as the original STW34NB20, ensuring regulatory compliance for new designs and procurement.

Q: What is the operating temperature advantage of substitute parts?

A: IRFP250MPBF, IRFP250NPBF, IRFP4227PBF, and IXTQ50N20P all support extended operating temperature ranges to 175°C, compared to the STW34NB20's 150°C maximum. This provides additional thermal margin in high-temperature applications. IRFP250PBF maintains the 150°C limit, matching the original specification.

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