BDX33CTU Equivalent & Substitute Parts

Part Overview

The BDX33CTU 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 Through Hole TO-220-3 package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production applications. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

BDX33CTU

onsemiIn Stock: 676BDX33CTU Datasheet

Current PartRFQ

BDX33CG

onsemiIn Stock: 2052BDX33CG Datasheet

SimilarRFQ

BDX33C

Fairchild SemiconductorIn Stock: 21693BDX33C Datasheet

DirectRFQ

TIP142T

STMicroelectronicsIn Stock: 21597TIP142T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BDX33CTU is determined by equivalence in the following critical parameters: transistor type (NPN - Darlington), maximum collector current (10 A), maximum collector-emitter breakdown voltage (100 V), maximum power dissipation (70 W or greater), and Through Hole mounting in TO-220-3 package configuration.

The identified substitute parts are grouped as follows:

Direct Electrical Equivalents (Identical Ratings):

• BDX33CG (onsemi): Matches all electrical specifications and package type. Active product status with extended operating temperature range.
• BDX33C (Fairchild Semiconductor): Matches all electrical specifications and package type. Active product status with RoHS3 compliance.

Functional Equivalent (Enhanced Specifications):

• TIP142T (STMicroelectronics): Exceeds power rating (80 W vs. 70 W) and current gain specifications while maintaining voltage and current ratings. Active product status with RoHS3 compliance.

All substitute parts maintain the required 100 V breakdown voltage, 10 A collector current capability, and TO-220-3 package footprint necessary for direct circuit replacement.

Parameter Comparison

Engineering Selection Recommendations

BDX33CG (onsemi) is the primary substitute for BDX33CTU applications. This part maintains identical electrical specifications and package configuration while offering active product status. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the main part. RoHS3 compliance and REACH unaffected status support regulatory requirements for new production.

BDX33C (Fairchild Semiconductor) provides an alternative equivalent with identical electrical ratings and active status. RoHS3 compliance is confirmed. REACH affected status requires verification against specific application regulatory requirements before selection.

TIP142T (STMicroelectronics) functions as an enhanced substitute with superior power dissipation capability (80 W) and higher current gain specifications. This part is suitable for applications where the main part specifications are met but additional thermal or gain margin is beneficial. Active product status and RoHS3 compliance are confirmed. REACH unaffected status aligns with regulatory requirements.

Selection between BDX33CG and BDX33C depends on supply chain availability and regulatory compliance requirements. TIP142T selection is appropriate when enhanced performance specifications provide system-level advantages.

Frequently Asked Questions (FAQ)

Q: Can BDX33CG directly replace BDX33CTU in existing designs?

A: Yes. BDX33CG maintains identical electrical specifications (10 A collector current, 100 V breakdown voltage, 70 W power rating) and TO-220-3 package configuration. The part is pin-compatible and electrically equivalent for direct circuit substitution.

Q: What is the difference between BDX33CG and BDX33C?

A: Both parts meet the electrical requirements of BDX33CTU. BDX33CG is manufactured by onsemi with REACH unaffected status. BDX33C is manufactured by Fairchild Semiconductor with REACH affected status. Both are RoHS3 compliant and active products. Selection depends on supply availability and regulatory compliance verification.

Q: Why does TIP142T have different Vce saturation and current gain specifications?

A: TIP142T is rated at higher current levels (10 A vs. 3 A for the main part specifications). The different test conditions (40 mA base current at 10 A collector current vs. 6 mA base current at 3 A collector current) reflect the device's performance envelope at maximum rated current. The 80 W power rating exceeds the 70 W requirement, providing additional thermal capability.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use TO-220-3 Through Hole package configuration, maintaining mechanical and thermal interface compatibility. Supplier device package designations may vary (TO-220 vs. TO-220AB vs. TO-220-3), but all are functionally equivalent TO-220 family packages suitable for identical PCB footprints and heatsink mounting.

Q: What compliance certifications should I verify before selecting a substitute?

A: Verify RoHS3 compliance status and REACH regulatory status against your application requirements. BDX33CG and TIP142T are REACH unaffected. BDX33C is REACH affected and requires regulatory verification. All three substitute parts are RoHS3 compliant.

Q: Can I use TIP142T in place of BDX33CTU if my application requires lower power dissipation?

A: Yes. TIP142T exceeds the 70 W power requirement and maintains all voltage and current specifications. The enhanced specifications do not create incompatibility in applications designed for BDX33CTU. The higher current gain and power rating provide additional design margin without adverse effects.