BUX98APW Equivalent & Substitute Parts

Part Overview

The BUX98APW is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 450 V collector-emitter breakdown voltage and 24 A maximum collector current in a TO-247-3 through-hole package. This device is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity. The 200 W power rating and high-voltage capability position this transistor for high-power switching and amplification applications requiring robust thermal management.

Substiute Parts

BUX98APW

STMicroelectronicsIn Stock: 1143BUX98APW Datasheet

Current PartRFQ

BUF420AW

STMicroelectronicsIn Stock: 1485BUF420AW Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BUX98APW is determined by the following critical parameters:

• Transistor Type: Must be NPN to maintain circuit polarity and biasing requirements
• Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 450 V
• Current Rating: Collector current capacity must meet or exceed 24 A
• Power Dissipation: Maximum power rating must support 200 W operation
• Package: TO-247-3 through-hole package ensures mechanical and thermal compatibility
• Saturation Characteristics: Vce(sat) values determine switching efficiency and heat generation

The BUF420AW qualifies as a direct substitute based on matching all critical electrical and mechanical parameters while offering enhanced current capacity (30 A vs. 24 A) and improved saturation voltage characteristics.

Parameter Comparison

Engineering Selection Recommendations

BUX98APW (Obsolete)

The BUX98APW is classified as obsolete and no longer in active production. While 1072 units remain in stock, this part number should not be selected for new designs or long-term production commitments.

BUF420AW (Active Substitute)

The BUF420AW is the recommended substitute for the BUX98APW. This device is in active production status with 1430 units currently in stock. Both components are manufactured by STMicroelectronics and maintain identical voltage and power ratings. The BUF420AW provides superior electrical performance through:

• Higher maximum collector current (30 A vs. 24 A), providing additional design margin
• Lower saturation voltage (0.5 V vs. 1.2 V), reducing power dissipation and heat generation
• Identical thermal and mechanical specifications, ensuring direct PCB compatibility

Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the BUF420AW directly replace the BUX98APW in existing circuit designs?

A: Yes. Both transistors share identical voltage ratings (450 V), power ratings (200 W), operating temperature limits (150°C TJ), and TO-247-3 package specifications. The BUF420AW's higher current rating (30 A vs. 24 A) and lower saturation voltage provide improved performance without requiring circuit modifications.

Q: What are the key differences between these two transistors?

A: The primary differences are product status and electrical performance. The BUX98APW is obsolete, while the BUF420AW is in active production. The BUF420AW offers 25% higher maximum collector current and significantly lower saturation voltage (0.5 V vs. 1.2 V at comparable operating points), resulting in reduced power dissipation.

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

A: Both devices share identical maximum power ratings (200 W) and operating temperature limits (150°C TJ). The BUF420AW's lower saturation voltage generates less heat at equivalent current levels, potentially improving thermal performance in the same application.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the BUX98APW and BUF420AW are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of the TO-247-3 package for these transistors?

A: The TO-247-3 package is a through-hole, three-lead configuration designed for high-power applications. It provides direct mechanical and thermal compatibility between the BUX98APW and BUF420AW, allowing pin-for-pin substitution without PCB redesign.

Q: Why is the BUX98APW classified as obsolete?

A: The BUX98APW has been discontinued by STMicroelectronics. The BUF420AW represents the active product line continuation with enhanced specifications, making it the appropriate choice for new designs and ongoing production support.