TIP126G Equivalent & Substitute Parts

Part Overview

The TIP126G is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220 through-hole package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility across critical electrical parameters while accommodating available inventory and product status considerations.

Substiute Parts

TIP126G

onsemiIn Stock: 7978TIP126G Datasheet

Current PartRFQ

TIP127G

onsemiIn Stock: 1984TIP127G Datasheet

DirectRFQ

TIP125

NTE Electronics, IncIn Stock: 31192TIP125 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TIP126G are classified based on electrical parameter compatibility and product availability status. The primary substitution criterion is maintenance of the PNP Darlington transistor topology with compatible current and voltage ratings. Substitutes are grouped into two categories:

Direct Substitutes (Voltage-Rated Equivalents): Parts that maintain or exceed the 80 V collector-emitter breakdown voltage specification while preserving all other critical electrical parameters, including 5 A maximum collector current, 2 W power dissipation, and TO-220-3 package configuration.

Functional Substitutes (Voltage-Derated Alternatives): Parts that operate within reduced voltage specifications but maintain identical current handling, gain characteristics, and thermal performance. These substitutes are suitable for applications where the full 80 V rating is not required.

The following parameters determine substitution validity:

• Transistor Type: PNP - Darlington (mandatory)
• Current - Collector (Ic) (Max): 5 A (mandatory)
• Vce Saturation: 4V @ 20mA, 5A (mandatory)
• DC Current Gain (hFE): 1000 @ 3A, 3V (mandatory)
• Power - Max: 2 W (mandatory)
• Package / Case: TO-220-3 (mandatory)
• Operating Temperature: -65°C to 150°C (mandatory)

Parameter Comparison

Engineering Selection Recommendations

TIP127G (onsemi): This part is the primary direct substitute for the TIP126G. It maintains identical electrical specifications across all critical parameters while providing an increased collector-emitter breakdown voltage rating of 100 V. The TIP127G is manufactured by onsemi, the original equipment manufacturer of the TIP126G, ensuring design continuity and process consistency. The part holds active product status with current inventory availability. RoHS3 compliance and REACH unaffected status align with the original part's regulatory standing. Selection of TIP127G is appropriate for applications requiring direct replacement without circuit modification.

TIP125 (NTE Electronics, Inc): This part functions as a voltage-derated substitute suitable for applications where the collector-emitter breakdown voltage requirement does not exceed 60 V. The TIP125 maintains all critical electrical parameters including current handling, gain characteristics, and thermal performance. However, the TIP125 carries RoHS non-compliant status, which may present regulatory constraints in certain procurement environments. This substitute is appropriate only when voltage derating is acceptable and RoHS compliance is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can the TIP127G directly replace the TIP126G without circuit modification?

A: Yes. The TIP127G maintains identical electrical specifications across all critical parameters including collector current, saturation voltage, current gain, and power dissipation. The increased breakdown voltage rating of 100 V provides additional design margin. Direct substitution is valid for all applications where the TIP126G was originally specified.

Q: Under what conditions is the TIP125 an acceptable substitute?

A: The TIP125 is acceptable in applications where the maximum collector-emitter voltage does not exceed 60 V. All other electrical parameters—current handling, gain, saturation voltage, and thermal characteristics—remain identical to the TIP126G. The TIP125 is not suitable for applications requiring the full 80 V rating.

Q: What is the significance of the RoHS compliance difference between TIP127G and TIP125?

A: The TIP127G maintains ROHS3 compliance, consistent with the original TIP126G specification. The TIP125 is RoHS non-compliant. In procurement environments subject to RoHS regulations or customer requirements, the TIP127G is the appropriate selection. The TIP125 may be restricted or require exemption documentation.

Q: Are there package or pinout differences between these substitutes?

A: All three parts—TIP126G, TIP127G, and TIP125—utilize the TO-220-3 package configuration with identical through-hole mounting. Pinout compatibility is maintained across all substitutes. No circuit board layout modifications are required.

Q: How does the increased voltage rating of the TIP127G affect circuit performance?

A: The TIP127G's 100 V breakdown voltage rating does not alter circuit performance in applications designed for 80 V operation. The higher rating provides additional safety margin and protection against voltage transients. All other electrical characteristics remain unchanged.

Q: What inventory considerations apply to these substitutes?

A: The TIP127G (onsemi) is actively manufactured with current inventory availability. The TIP125 (NTE Electronics, Inc) is also actively produced with substantial inventory levels. Both parts are suitable for ongoing production requirements. The original TIP126G, classified as obsolete, should not be specified for new designs.