BDX33C Equivalent & Substitute Parts

Part Overview

The BDX33C is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 10 A maximum collector current in a TO-220 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with comparable or enhanced performance characteristics within the same package category.

Substiute Parts

BDX33C

onsemiIn Stock: 21688BDX33C Datasheet

Current PartRFQ

BDX33CG

onsemiIn Stock: 2052BDX33CG Datasheet

DirectRFQ

TIP142T

STMicroelectronicsIn Stock: 21597TIP142T Datasheet

DirectRFQ

BDW93C

STMicroelectronicsIn Stock: 21675BDW93C Datasheet

SimilarRFQ

BDX33C

Fairchild SemiconductorIn Stock: 21693BDX33C Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BDX33C is determined by equivalence across the following critical parameters: transistor type (NPN - Darlington), maximum collector current (10 A minimum), collector-emitter breakdown voltage (100 V minimum), power dissipation capability (70 W minimum), package type (TO-220-3), and mounting configuration (through-hole). Parts are classified into two categories:

Direct Equivalents maintain all specified electrical parameters and differ only in packaging format or compliance status. These parts are pin-compatible and functionally interchangeable without circuit modification.

Functional Substitutes meet or exceed the primary electrical specifications (voltage, current, power) and package requirements but may exhibit variations in secondary parameters such as saturation voltage, cutoff current, or current gain. These parts are suitable for applications where the BDX33C specifications define the minimum acceptable performance threshold.

Parameter Comparison

Engineering Selection Recommendations

BDX33CG (onsemi) is the primary direct equivalent for the BDX33C. This part maintains identical electrical specifications and TO-220-3 package configuration. The BDX33CG differs only in packaging format (tube) and product status (active). The transition from the obsolete BDX33C to the active BDX33CG provides design continuity with ROHS3 compliance and sustained manufacturing availability.

TIP142T (STMicroelectronics) serves as a functional substitute with enhanced power dissipation (80 W versus 70 W) and higher DC current gain (1000 @ 5A, 4V versus 750 @ 3A, 3V). The TIP142T meets all minimum electrical requirements and maintains TO-220-3 package compatibility. This part is suitable for applications where the BDX33C specifications represent the baseline performance threshold. The TIP142T is ROHS3 compliant and actively manufactured.

BDW93C (STMicroelectronics) is a functional substitute with increased maximum collector current (12 A versus 10 A) and enhanced power dissipation (80 W versus 70 W). The BDW93C maintains 100 V breakdown voltage and TO-220-3 package configuration. This part is appropriate for designs requiring higher current capacity within the same voltage and package envelope. The BDW93C is ROHS3 compliant and actively manufactured.

BDX33C (Fairchild Semiconductor) is a direct equivalent from an alternative manufacturer. This part maintains identical electrical specifications, 70 W power rating, and TO-220-3 package configuration. The Fairchild variant is ROHS3 compliant and actively manufactured. This option provides supply diversification from a second qualified source.

Selection between active alternatives should prioritize ROHS3 compliance and sustained manufacturing status. The BDX33CG represents the lowest-risk transition path due to identical specifications and onsemi manufacturer continuity. The TIP142T and BDW93C are appropriate where enhanced performance margins are beneficial or where supply from STMicroelectronics is preferred.

Frequently Asked Questions (FAQ)

Q: Can the BDX33CG directly replace the obsolete BDX33C without circuit modification?

A: Yes. The BDX33CG maintains identical electrical specifications (10 A collector current, 100 V breakdown voltage, 70 W power rating, 750 hFE minimum) and TO-220-3 package configuration. Pin assignment and functional behavior are equivalent. No circuit modification is required.

Q: What is the primary difference between the BDX33C and BDX33CG?

A: The BDX33CG is the active production variant of the BDX33C. Both parts share identical electrical specifications and package type. The BDX33CG is supplied in tube packaging, is ROHS3 compliant, and is actively manufactured by onsemi. The original BDX33C is classified as obsolete.

Q: Can the TIP142T be used as a substitute for the BDX33C?

A: Yes, with the following considerations. The TIP142T meets all minimum electrical requirements: 10 A collector current, 100 V breakdown voltage, and TO-220-3 package. The TIP142T provides enhanced performance with 80 W power dissipation (versus 70 W) and higher current gain (1000 @ 5A, 4V versus 750 @ 3A, 3V). The TIP142T is suitable for applications where the BDX33C specifications define the minimum acceptable performance. Pin assignment is identical.

Q: What is the advantage of the BDW93C over the BDX33C?

A: The BDW93C provides increased maximum collector current (12 A versus 10 A) and enhanced power dissipation (80 W versus 70 W) while maintaining 100 V breakdown voltage and TO-220-3 package compatibility. The BDW93C is appropriate for designs requiring higher current capacity or where additional thermal margin is beneficial.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The BDX33CG, TIP142T, BDW93C, and Fairchild BDX33C are all ROHS3 compliant. The original onsemi BDX33C is RoHS non-compliant. For applications subject to RoHS requirements, selection must be limited to active, compliant alternatives.

Q: Is the TO-220-3 package identical across all listed parts?

A: Yes. All listed parts use the TO-220-3 package with through-hole mounting. Pin assignment and mechanical envelope are compatible. PCB layout and heatsink mounting are interchangeable.

Q: What is the operating temperature range for each substitute?

A: The onsemi BDX33C and BDX33CG operate from -65°C to 150°C (TJ). The STMicroelectronics TIP142T and BDW93C, and the Fairchild BDX33C operate to 150°C (TJ) maximum. For applications requiring the full -65°C lower temperature limit, the onsemi variants are specified.

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

A: For new designs, the BDX33CG is the recommended primary choice due to identical specifications, active manufacturing status, and ROHS3 compliance. The TIP142T and BDW93C are appropriate where enhanced performance margins or higher current capacity provide design benefits. All three options ensure long-term supply continuity and regulatory compliance.