TIP126TU Equivalent & Substitute Parts

Part Overview

The TIP126TU 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-220-3 through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with modified electrical parameters suitable for specific application requirements.

Substiute Parts

TIP126TU

onsemiIn Stock: 2507TIP126TU Datasheet

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TIP127G

onsemiIn Stock: 1984TIP127G Datasheet

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TIP126G

onsemiIn Stock: 7978TIP126G Datasheet

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TIP125

NTE Electronics, IncIn Stock: 31192TIP125 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TIP126TU is determined by the following critical electrical and mechanical parameters:

Mandatory Compatibility Criteria:

• Transistor topology: PNP - Darlington configuration
• Mounting type: Through Hole
• Package form factor: TO-220-3 or equivalent TO-220 variant
• Collector current rating: 5 A minimum
• DC current gain (hFE): 1000 minimum at specified conditions
• Vce saturation: 4 V maximum at rated conditions

Voltage Rating Flexibility: Substitute parts may operate at higher collector-emitter breakdown voltages than the TIP126TU (80 V), provided all other electrical specifications meet or exceed the original part requirements. Lower voltage ratings are not acceptable substitutes.

Identified Substitute Categories:

1. Direct Equivalent (Identical Specifications): TIP126G maintains the 80 V rating with identical current and gain specifications, differing only in packaging designation and temperature range documentation.

2. Higher Voltage Substitute: TIP127G provides 100 V breakdown voltage with identical current and gain ratings, suitable for applications requiring enhanced voltage margin.

3. Lower Voltage Substitute: TIP125 operates at 60 V breakdown voltage with identical current and gain specifications, applicable only to applications with reduced voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

TIP126G: This part is the direct equivalent to TIP126TU, maintaining identical electrical specifications and the same 80 V collector-emitter breakdown voltage. Both parts are classified as obsolete; however, TIP126G offers expanded temperature range documentation (-65°C to 150°C versus 150°C maximum for TIP126TU) and improved current cutoff specification (500 µA versus 2 mA). TIP126G is ROHS3 compliant and represents the preferred direct replacement when 80 V operation is required.

TIP127G: This substitute provides a higher collector-emitter breakdown voltage of 100 V while maintaining all other electrical specifications identical to TIP126TU. TIP127G is currently in active product status, ensuring long-term availability. This part is ROHS3 compliant and suitable for applications where voltage margin enhancement is beneficial. The 100 V rating accommodates transient overvoltage conditions without performance degradation.

TIP125: This substitute operates at a reduced collector-emitter breakdown voltage of 60 V, maintaining identical current and gain specifications. TIP125 is currently in active product status and available in high inventory quantities. However, TIP125 is RoHS non-compliant, which may restrict use in regulated applications. This part is applicable only to applications with confirmed maximum operating voltages below 60 V.

Frequently Asked Questions (FAQ)

Q: Can TIP126G be used as a direct replacement for TIP126TU?

A: Yes. TIP126G maintains identical electrical specifications for collector current (5 A), collector-emitter breakdown voltage (80 V), saturation voltage (4 V), and DC current gain (1000). Both parts use the TO-220-3 package. The primary differences are product status classification and temperature range documentation, with TIP126G offering expanded specifications.

Q: What is the primary difference between TIP127G and TIP126TU?

A: TIP127G operates at 100 V collector-emitter breakdown voltage compared to TIP126TU at 80 V. All other electrical parameters—collector current (5 A), saturation voltage (4 V), and DC current gain (1000)—are identical. TIP127G is currently in active production status, whereas TIP126TU is obsolete.

Q: Is TIP125 a suitable substitute for all TIP126TU applications?

A: TIP125 is suitable only for applications where the maximum operating voltage does not exceed 60 V. The part maintains identical collector current (5 A), saturation voltage (4 V), and DC current gain (1000) specifications. TIP125 is RoHS non-compliant, which may restrict use in certain regulated markets or applications with RoHS compliance requirements.

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

A: Yes. TIP126G, TIP127G, and TIP125 are all available in TO-220-3 through-hole packages, ensuring mechanical and thermal compatibility with TIP126TU in existing circuit board designs.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active product status indicates ongoing manufacturing and long-term availability assurance. Obsolete status indicates discontinued production. TIP127G and TIP125 are active products, ensuring reliable procurement for new designs. TIP126G is obsolete but may remain available through existing inventory channels.

Q: How do the current cutoff specifications differ among these parts?

A: TIP126TU specifies 2 mA maximum collector cutoff current, while TIP126G, TIP127G, and TIP125 specify 500 µA maximum. Lower cutoff current indicates reduced leakage in the off state, which may improve circuit performance in low-power or precision applications.

Q: What compliance certifications apply to these parts?

A: TIP126TU, TIP126G, and TIP127G are ROHS3 compliant. TIP125 is RoHS non-compliant. All parts are REACH unaffected and classified under ECCN EAR99 for export control purposes.