TIP42B Equivalent & Substitute Parts

Part Overview

The TIP42B is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 6 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The TIP42B serves applications requiring moderate-power PNP switching and amplification in industrial and consumer electronics.

Substiute Parts

TIP42B

onsemiIn Stock: 1766TIP42B Datasheet

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D45VH10G

onsemiIn Stock: 50578D45VH10G Datasheet

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TIP32BG

onsemiIn Stock: 3750TIP32BG Datasheet

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TIP42G

onsemiIn Stock: 3248TIP42G Datasheet

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TIP42BG

onsemiIn Stock: 2140TIP42BG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TIP42B is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor polarity (PNP type required)
• Voltage rating (Collector-Emitter Breakdown voltage must equal or exceed 80 V)
• Current rating (Collector current capacity must equal or exceed 6 A)
• Power dissipation (Maximum power rating must support 2 W or greater)
• Frequency response (Transition frequency must support 3 MHz or greater)
• Saturation characteristics (Vce saturation and current gain must be compatible with circuit requirements)

Mechanical Compatibility Criteria:

• Package type (TO-220-3 through-hole configuration)
• Pin configuration (3-pin standard BJT arrangement)
• Thermal characteristics (Operating temperature range must encompass -65°C to 150°C or be suitable for intended application)

Substitute parts are grouped into three categories based on their relationship to the TIP42B:

Direct Equivalent: TIP42BG maintains identical electrical specifications and package configuration, providing pin-for-pin replacement capability.

Functional Equivalent (Lower Current Rating): TIP32BG shares voltage rating, power rating, frequency response, and package type but operates at reduced maximum collector current (3 A versus 6 A), suitable for applications not requiring full 6 A capacity.

Functional Equivalent (Lower Voltage Rating): TIP42G maintains current, power, and frequency specifications but operates at reduced voltage rating (40 V versus 80 V), suitable for lower-voltage applications.

Enhanced Substitute (Higher Performance): D45VH10G exceeds all electrical specifications with higher current capacity (15 A), higher power rating (83 W), and higher frequency response (50 MHz), providing superior performance in the same package type.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-for-Pin Substitution):

TIP42BG is the primary direct equivalent to TIP42B, offering identical electrical specifications and package configuration. TIP42BG is classified as Last Time Buy status with ROHS3 compliance, making it suitable for new designs requiring regulatory compliance. Inventory availability is 2,100 units.

For RoHS Compliance Transition:

If the design requires transition to RoHS3-compliant components, TIP42BG, TIP32BG, TIP42G, or D45VH10G are all acceptable alternatives. All substitute parts carry ROHS3 Compliant status, whereas the original TIP42B is RoHS non-compliant.

For Applications with Reduced Current Requirements:

TIP32BG operates at 3 A maximum collector current while maintaining 80 V voltage rating, 2 W power rating, and 3 MHz frequency response. This part is classified as Active status with the highest inventory availability (3,700 units) among all substitutes, providing long-term procurement security.

For Applications with Reduced Voltage Requirements:

TIP42G maintains 6 A current capacity, 2 W power rating, and 3 MHz frequency response but operates at 40 V maximum collector-emitter breakdown voltage. This part is classified as Last Time Buy status.

For Enhanced Performance Applications:

D45VH10G provides superior electrical performance with 15 A current capacity, 83 W power rating, and 50 MHz frequency response, all within the same TO-220-3 package. This part is classified as Active status with the highest inventory availability (50,501 units) and is suitable for applications requiring higher power handling or faster switching speeds.

For Long-Term Availability:

TIP32BG and D45VH10G are both classified as Active status, indicating ongoing production and long-term availability. These parts are recommended for new designs requiring extended component lifecycle support.

Frequently Asked Questions (FAQ)

Q: Can TIP42BG be used as a direct replacement for TIP42B?

A: Yes. TIP42BG is a direct equivalent with identical electrical specifications (80 V, 6 A, 2 W, 3 MHz) and TO-220-3 package configuration. Pin-for-pin substitution is supported without circuit modification.

Q: What is the difference between TIP42B and TIP42BG?

A: TIP42B and TIP42BG share identical electrical and mechanical specifications. The primary differences are product status (TIP42B is Obsolete; TIP42BG is Last Time Buy) and RoHS compliance (TIP42B is non-compliant; TIP42BG is ROHS3 compliant).

Q: Can TIP32BG replace TIP42B in all applications?

A: TIP32BG can replace TIP42B only in applications where the maximum collector current requirement does not exceed 3 A. TIP32BG maintains the 80 V voltage rating, 2 W power rating, 3 MHz frequency response, and TO-220-3 package. Applications requiring the full 6 A capacity must use TIP42BG, TIP42G, or D45VH10G.

Q: Why would D45VH10G be selected over TIP42BG?

A: D45VH10G is selected when applications require higher current capacity (15 A versus 6 A), higher power dissipation (83 W versus 2 W), or faster switching speeds (50 MHz versus 3 MHz). D45VH10G is also classified as Active status, providing superior long-term availability compared to TIP42BG (Last Time Buy status).

Q: Is TIP42G suitable for 80 V applications?

A: No. TIP42G is rated for 40 V maximum collector-emitter breakdown voltage and is not suitable for applications requiring 80 V operation. TIP42G is appropriate only for circuits operating at 40 V or lower.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All substitute parts (TIP42BG, TIP32BG, TIP42G, and D45VH10G) are packaged in TO-220-3 through-hole configuration, supporting direct mechanical substitution without PCB modification.

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

A: TIP42B, TIP42BG, TIP32BG, and TIP42G all operate across -65°C to 150°C. D45VH10G operates across -55°C to 150°C, which is suitable for most applications but does not extend to the lower temperature limit of the original TIP42B.

Q: Which substitute part offers the best long-term procurement security?

A: D45VH10G and TIP32BG are both classified as Active status, indicating ongoing production. D45VH10G has the highest inventory availability (50,501 units), followed by TIP32BG (3,700 units). Both parts are recommended for new designs requiring extended lifecycle support.

Q: Are all substitute parts RoHS compliant?

A: Yes. TIP42BG, TIP32BG, TIP42G, and D45VH10G are all ROHS3 compliant. The original TIP42B is RoHS non-compliant. For designs requiring regulatory compliance, any of the substitute parts are acceptable alternatives.

Q: Can TIP42G and TIP42BG be used interchangeably?

A: No. While both parts maintain 6 A current capacity and 3 MHz frequency response, TIP42G is rated for 40 V maximum voltage, whereas TIP42BG is rated for 80 V. Selection depends on the circuit voltage requirements. TIP42BG is required for 80 V applications.