TIP125TU PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The TIP125TU is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete product status. Due to obsolescence, identifying functionally equivalent substitute parts with active product status and maintained electrical specifications is necessary for ongoing design support and procurement continuity.

Substiute Parts

TIP125TU

onsemiIn Stock: 866TIP125TU Datasheet

Current PartRFQ

TIP125

NTE Electronics, IncIn Stock: 31192TIP125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete TIP125TU is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor topology: PNP Darlington configuration
• Voltage rating: 60 V collector-emitter breakdown (maximum)
• Current rating: 5 A maximum collector current
• Saturation voltage: 4 V @ 20 mA base current, 5 A collector current
• DC current gain: minimum 1000 @ 3 A collector current, 3 V Vce
• Power dissipation: 2 W maximum

Mechanical Equivalence Criteria:

• Package type: TO-220-3
• Mounting: Through-hole configuration

The substitute part TIP125 (NTE Electronics, Inc) maintains all critical electrical parameters within the specified ranges and shares identical mechanical packaging, establishing direct functional equivalence for circuit-level replacement.

Parameter Comparison

Engineering Selection Recommendations

TIP125 (NTE Electronics, Inc) as Primary Substitute:

The TIP125 from NTE Electronics maintains active product status, ensuring long-term availability and supply chain continuity. All critical electrical parameters—collector-emitter breakdown voltage, saturation voltage, and DC current gain—match the TIP125TU specification exactly. The substitute demonstrates superior performance in collector cutoff current (500 µA versus 2 mA) and extended operating temperature range (−65 °C to 150 °C versus 150 °C maximum).

Compliance Consideration:

The TIP125TU carries ROHS3 compliance certification, while the NTE Electronics TIP125 is RoHS non-compliant. Applications subject to RoHS regulatory requirements must evaluate compliance obligations independently before substitution.

Mechanical Compatibility:

Both devices utilize identical TO-220-3 through-hole packaging, permitting direct board-level replacement without PCB modification or thermal management redesign.

Frequently Asked Questions (FAQ)

Q: Can TIP125 (NTE Electronics) directly replace TIP125TU (onsemi) in existing circuits?

A: Yes. Both devices share identical electrical specifications for collector-emitter breakdown voltage (60 V), saturation voltage (4 V @ 20 mA, 5 A), and DC current gain (1000 @ 3 A, 3 V). The TO-220-3 package is mechanically identical, permitting direct substitution without circuit redesign.

Q: What is the difference in collector cutoff current between these parts?

A: The TIP125TU specifies maximum collector cutoff current of 2 mA, while the TIP125 specifies 500 µA. The substitute exhibits lower leakage current, which is advantageous for low-power standby applications and does not create compatibility issues.

Q: Does the extended temperature range of the NTE Electronics TIP125 affect substitution suitability?

A: No. The TIP125 operating range (−65 °C to 150 °C) encompasses the TIP125TU maximum junction temperature of 150 °C. The extended lower temperature limit provides additional operational margin and does not compromise circuit compatibility.

Q: Are there RoHS compliance implications for this substitution?

A: Yes. The TIP125TU is ROHS3 compliant; the NTE Electronics TIP125 is RoHS non-compliant. Applications requiring RoHS certification must verify regulatory compliance requirements before implementing this substitution.

Q: Is the TO-220-3 package identical between both parts?

A: Yes. Both the TIP125TU and TIP125 use the TO-220-3 through-hole package with identical pin configuration, thermal characteristics, and mechanical dimensions. No PCB layout modification is required.

Q: Why is the TIP125TU classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued active production and support. The TIP125 from NTE Electronics maintains active product status, providing continued availability and technical support.