BUZ73AL N-Channel MOSFET 200V 5.5A Equivalent & Substitute Parts

Part Overview

The BUZ73AL is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 200V drain-to-source voltage with 5.5A continuous drain current at 25°C. This device is part of the SIPMOS® series and features a TO-220-3 through-hole package. The BUZ73AL is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substitute parts listed below maintain the same voltage rating (200V Vdss) and package type (TO-220-3) while offering enhanced current handling and power dissipation capabilities. All substitutes are N-Channel MOSFETs with compatible gate voltage specifications and thermal operating ranges suitable for direct replacement in applications where higher performance margins are acceptable.

Substiute Parts

BUZ73AL

Infineon TechnologiesIn Stock: 7797BUZ73AL Datasheet

Current PartRFQ

PHP20NQ20T,127

NXP SemiconductorsIn Stock: 9905PHP20NQ20T,127 Datasheet

MFR RecommendedRFQ

PHP33NQ20T,127

Nexperia USA Inc.In Stock: 11471PHP33NQ20T,127 Datasheet

MFR RecommendedRFQ

PSMN057-200P,127

Nexperia USA Inc.In Stock: 850PSMN057-200P,127 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BUZ73AL is determined by the following critical parameters:

Mandatory Matching Criteria:

• Drain-to-Source Voltage (Vdss): 200V (exact match required)
• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Package Type: TO-220-3 (through-hole)
• Gate Voltage Range (Vgs): ±20V (compatible)

Performance Enhancement Parameters: All substitute parts exceed the BUZ73AL in continuous drain current (Id) and power dissipation (Ptot), providing higher current capacity and thermal headroom. These enhancements are compatible with applications designed for the BUZ73AL, as they represent upward-compatible specifications.

Substitute Parts Identified:

1. PHP20NQ20T,127 (NXP Semiconductors) – 20A, 150W, Active status
2. PHP33NQ20T,127 (Nexperia USA Inc.) – 32.7A, 230W, Obsolete status
3. PSMN057-200P,127 (Nexperia USA Inc.) – 39A, 250W, Active status

All three substitutes maintain 200V Vdss, TO-220-3 package configuration, and ±20V gate voltage compatibility with the original BUZ73AL.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status Priority:

PSMN057-200P,127 and PHP20NQ20T,127 are both classified as Active products, ensuring long-term availability and continued manufacturer support. PSMN057-200P,127 offers the highest current capacity (39A) and lowest on-state resistance (57 mOhm), making it the preferred choice for new designs requiring maximum performance margin above the BUZ73AL baseline.

For Compliance and Environmental Requirements:

PSMN057-200P,127 and PHP33NQ20T,127 carry ROHS3 Compliant certification. All three substitute parts maintain REACH Unaffected status, matching the regulatory compliance profile of the original BUZ73AL.

For Thermal Operating Range:

All substitute parts extend the maximum operating temperature to 175°C (compared to 150°C for BUZ73AL), providing enhanced thermal margin in high-temperature applications.

Package Compatibility Note:

Substitute parts use TO-220AB package designation, which is mechanically and electrically compatible with TO-220-3 through-hole mounting. Pin configuration and lead spacing remain identical for direct PCB replacement.

Frequently Asked Questions (FAQ)

Q: Can PHP20NQ20T,127, PHP33NQ20T,127, and PSMN057-200P,127 be used as direct replacements for BUZ73AL?

A: Yes. All three substitutes maintain the same 200V drain-to-source voltage rating, N-Channel MOSFET technology, ±20V gate voltage specification, and TO-220-3 through-hole package configuration. The substitutes provide higher current capacity and power dissipation, which are compatible with BUZ73AL applications.

Q: What is the difference between TO-220-3 and TO-220AB package designations?

A: TO-220-3 and TO-220AB refer to the same physical package format with three leads (Gate, Drain, Source). The designations reflect different manufacturer naming conventions. Pin spacing, lead configuration, and PCB footprint are identical, enabling direct mechanical and electrical substitution.

Q: Why do the substitute parts have higher input capacitance (Ciss) values?

A: Higher input capacitance is a characteristic of MOSFETs with larger die sizes and higher current ratings. PSMN057-200P,127 (3750 pF) and PHP20NQ20T,127 (2470 pF) have larger active areas than BUZ73AL (840 pF) to support their increased current capacity. This affects gate drive requirements but does not prevent substitution in applications with adequate gate drive circuitry.

Q: Which substitute part should be selected for new designs?

A: PSMN057-200P,127 is recommended for new designs due to its Active product status, ROHS3 compliance, highest current rating (39A), and lowest on-state resistance (57 mOhm). This ensures long-term availability and maximum performance margin.

Q: Are there inventory considerations for substitute selection?

A: PSMN057-200P,127 has 784 units in stock, PHP20NQ20T,127 has 9872 units, and PHP33NQ20T,127 has 11410 units. For immediate procurement, PHP33NQ20T,127 and PHP20NQ20T,127 offer higher inventory availability.

Q: What is the impact of higher gate threshold voltage (Vgs(th)) on circuit operation?

A: Substitute parts have Vgs(th) = 4V @ 1mA, compared to BUZ73AL at 2V @ 1mA. This requires slightly higher gate drive voltage to achieve full on-state conduction. Standard gate drive circuits operating at 5V or 10V are compatible with all substitute parts.

Q: Do the substitute parts require different thermal management?

A: Substitute parts have significantly higher power dissipation ratings (150W to 250W versus 40W for BUZ73AL). Existing thermal management solutions designed for BUZ73AL will provide additional thermal margin when using substitutes. No additional cooling is required for equivalent operating conditions.