BUZ31 N-Channel MOSFET 200V 14.5A Equivalent & Substitute Parts

Part Overview

The BUZ31 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 200V drain-to-source voltage and 14.5A continuous drain current at 25°C. The device is packaged in TO-220-3 through-hole configuration with a maximum power dissipation of 95W. The BUZ31 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility within the 200V voltage class while accommodating variations in current rating, on-resistance, and thermal characteristics.

Key Parameters

Parameter	BUZ31 Value	Unit	Substitution Relevance
Drain-to-Source Voltage (Vdss)	200	V	Critical - must match or exceed
Continuous Drain Current (Id) @ 25°C	14.5	A (Tc)	Critical - substitute must meet or exceed
On-Resistance (Rds On Max) @ Id, Vgs	200 mOhm @ 9A, 5V	mOhm	Important - affects thermal performance
Gate Threshold Voltage (Vgs(th) Max) @ Id	4	V @ 1mA	Important - affects drive circuit compatibility
Power Dissipation (Max)	95	W (Tc)	Important - thermal design consideration
Operating Temperature Range	-55 to 150	°C (TJ)	Important - defines operational limits
Package / Case	TO-220-3	-	Critical - mechanical compatibility
Mounting Type	Through Hole	-	Critical - PCB assembly compatibility

Substitute Part Grouping Explanation

Substitution logic for the BUZ31 is based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 200V minimum (200V or higher acceptable)
Continuous Drain Current (Id): 14.5A minimum at 25°C
Package: TO-220-3 through-hole configuration
Mounting Type: Through-hole
Gate Threshold Voltage (Vgs(th)): Compatible with standard 5V to 10V drive circuits
Maximum Gate Voltage (Vgs Max): ±20V or higher

Secondary Considerations:

On-Resistance (Rds On): Lower values indicate improved thermal performance
Power Dissipation: Higher ratings provide thermal margin
Operating Temperature: Extended range (-55°C to 175°C preferred over -55°C to 150°C)
Product Status: Active status preferred for long-term availability

Substitutes are grouped into three categories based on current rating alignment: direct current equivalents (12A–15A range), higher current alternatives (20A–32.7A range), and higher voltage alternatives (250V class).

Parameter Comparison

Parameter	BUZ31	IRF200B211	RCX120N25	PHP20NQ20T,127	PHP33NQ20T,127	PSMN057-200P,127	STP19NF20	Unit
Manufacturer	Infineon	Infineon	Rohm	NXP	Nexperia	Nexperia	STMicroelectronics	-
Vdss	200	200	250	200	200	200	200	V
Id @ 25°C	14.5	12	12	20	32.7	39	15	A (Tc)
Rds On (Max)	200 @ 9A, 5V	170 @ 7.2A, 10V	-	130 @ 10A, 10V	77 @ 15A, 10V	57 @ 17A, 10V	160 @ 7.5A, 10V	mOhm
Vgs(th) (Max) @ Id	4 @ 1mA	4.9 @ 50µA	-	4 @ 1mA	4 @ 1mA	4 @ 1mA	4 @ 250µA	V
Vgs (Max)	±20	±20	±30	±20	±20	±20	±20	V
Power Dissipation (Max)	95	80	40 (Tc)	150	230	250	90	W (Tc)
Operating Temperature	-55 to 150	-55 to 175	-55 to 150	-55 to 175	-55 to 175	-55 to 175	-55 to 150	°C (TJ)
Package	TO-220-3	TO-220AB	TO-220FM	TO-220AB	TO-220AB	TO-220AB	TO-220	-
Product Status	Obsolete	Active	Active	Active	Obsolete	Active	Active	-
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

Direct Current Equivalents (12A–15A Range):

IRF200B211 (Infineon, Active): Meets minimum voltage and current requirements with 12A rating. On-resistance of 170 mOhm at 10V drive is comparable to BUZ31. Operating temperature extends to 175°C, providing thermal margin. ROHS3 compliant. Suitable for direct replacement in applications where 12A continuous current is sufficient.

STP19NF20 (STMicroelectronics, Active): Rated at 15A, exceeding BUZ31 current specification. On-resistance of 160 mOhm at 10V is favorable. ROHS3 compliant. Operating temperature limited to 150°C, matching BUZ31. Recommended for applications requiring current margin above 14.5A.

Higher Current Alternatives (20A–39A Range):

PHP20NQ20T,127 (NXP, Active): Rated at 20A with 130 mOhm on-resistance at 10V, providing significant current and thermal margin. Operating temperature extends to 175°C. Suitable for applications where higher current capacity and improved thermal performance are beneficial.

PSMN057-200P,127 (Nexperia, Active): Highest current rating at 39A with 57 mOhm on-resistance at 10V. Operating temperature extends to 175°C. ROHS3 compliant. Recommended for high-current applications or designs requiring maximum thermal headroom.

PHP33NQ20T,127 (Nexperia, Obsolete): Rated at 32.7A with 77 mOhm on-resistance. Obsolete status limits long-term availability. Not recommended for new designs.

Higher Voltage Alternative:

RCX120N25 (Rohm, Active): Rated at 250V, exceeding BUZ31 voltage specification. Current rating of 12A meets minimum requirement. ROHS3 compliant. Suitable for applications requiring voltage margin or operating in higher voltage environments. TO-220FM package variant may require PCB layout verification.

Compliance and Certification: All recommended active substitutes maintain REACH compliance and EAR99 classification. ROHS3 compliance is confirmed for all active parts. Moisture sensitivity level remains at MSL 1 (Unlimited) across all substitutes.

Frequently Asked Questions (FAQ)

Q1: Can I use IRF200B211 as a direct replacement for BUZ31?

A: IRF200B211 is electrically compatible with BUZ31 for applications requiring 12A or less continuous drain current. Both devices share 200V Vdss rating, similar gate threshold voltage (4V to 4.9V), and TO-220 package compatibility. IRF200B211 is active and ROHS3 compliant, making it suitable for new designs. However, verify that your application does not require the full 14.5A rating of BUZ31.

Q2: What is the difference between TO-220-3, TO-220AB, and TO-220FM packages?

A: All three are through-hole TO-220 variants with identical pin configurations (Gate, Drain, Source). TO-220-3 is the standard designation. TO-220AB and TO-220FM are manufacturer-specific variants with identical electrical performance and PCB footprint compatibility. Mechanical mounting and thermal interface characteristics are equivalent across all variants.

Q3: Should I choose a higher current-rated substitute like PSMN057-200P,127?

A: Higher current-rated substitutes provide thermal margin and improved on-resistance characteristics. PSMN057-200P,127 (39A, 57 mOhm) offers superior thermal performance compared to BUZ31 (14.5A, 200 mOhm). Select higher current ratings if your application operates near the BUZ31 current limit or requires reduced power dissipation. Verify that gate drive circuitry can accommodate the higher input capacitance (3750 pF vs. 1120 pF for BUZ31).

Q4: Why is RCX120N25 rated at 250V instead of 200V?

A: RCX120N25 is designed for higher voltage applications. The 250V Vdss rating provides voltage margin and allows operation in circuits with transient overvoltage conditions. This device is suitable for BUZ31 replacement in applications where voltage headroom is beneficial. Verify that your circuit design does not impose constraints on higher voltage-rated devices.

Q5: What does "Obsolete" product status mean for PHP33NQ20T,127?

A: Obsolete status indicates that the manufacturer has discontinued production and support. While existing inventory may be available, long-term supply cannot be guaranteed. For new designs, select active alternatives such as PSMN057-200P,127 or PHP20NQ20T,127 to ensure sustained component availability.

Q6: How do I verify gate drive circuit compatibility with substitute parts?

A: Compare gate threshold voltage (Vgs(th)) and maximum gate voltage (Vgs Max) specifications. All listed substitutes maintain Vgs(th) between 4V and 4.9V and Vgs Max at ±20V or higher, ensuring compatibility with standard 5V to 10V gate drive circuits. Verify input capacitance (Ciss) if using high-frequency PWM drivers; higher capacitance values require lower source impedance.

Q7: Which substitute offers the best thermal performance?

A: PSMN057-200P,127 provides the lowest on-resistance (57 mOhm at 10V) and highest power dissipation rating (250W), resulting in superior thermal performance. For applications operating at or near maximum current, this device minimizes junction temperature rise and extends device lifetime.

Q8: Are all substitutes ROHS3 compliant?

A: All active substitutes (IRF200B211, RCX120N25, PHP20NQ20T,127, PSMN057-200P,127, STP19NF20) are ROHS3 compliant. PHP33NQ20T,127 is also ROHS3 compliant but is obsolete. ROHS3 compliance ensures lead-free construction and environmental compliance for new designs.

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