TIP125G Equivalent & Substitute Parts

Part Overview

The TIP125G 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 through-hole package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity. Substitute parts maintain functional compatibility while offering alternative availability, compliance status, or enhanced electrical ratings.

Substiute Parts

TIP125G

onsemiIn Stock: 867TIP125G Datasheet

Current PartRFQ

TIP127G

onsemiIn Stock: 1984TIP127G Datasheet

DirectRFQ

TIP125

NTE Electronics, IncIn Stock: 31192TIP125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TIP125G are selected based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Mandatory Matching Parameters:

• Transistor Type: PNP - Darlington
• Current - Collector (Ic) (Max): 5 A
• Vce Saturation (Max) @ Ib, Ic: 4V @ 20mA, 5A
• Current - Collector Cutoff (Max): 500µA
• DC Current Gain (hFE) (Min) @ Ic, Vce: 1000 @ 3A, 3V
• Power - Max: 2 W
• Operating Temperature: -65°C ~ 150°C (TJ)
• Mounting Type: Through Hole
• Package / Case: TO-220-3

Allowable Variation Parameters:

• Voltage - Collector Emitter Breakdown (Max): Equal to or greater than 60 V
• Product Status: Active or Obsolete
• Manufacturer: Any qualified manufacturer

The TIP127G qualifies as a direct substitute with enhanced voltage rating (100 V vs. 60 V), maintaining all other electrical specifications. The TIP125 from NTE Electronics qualifies as a functional equivalent with identical voltage and current ratings, differing only in manufacturer and compliance status.

Parameter Comparison

Engineering Selection Recommendations

TIP127G (onsemi) - Primary Substitute

The TIP127G is the preferred substitute for the obsolete TIP125G. Both devices are manufactured by onsemi and maintain identical electrical specifications for collector current, saturation voltage, cutoff current, and DC current gain. The TIP127G provides enhanced voltage rating (100 V vs. 60 V), offering superior performance margin in applications with voltage transients or design headroom requirements. The TIP127G is in active production status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. Inventory availability is substantial at 1970 pieces.

TIP125 (NTE Electronics) - Secondary Substitute

The TIP125 from NTE Electronics provides functional equivalence with identical electrical ratings to the original TIP125G. This device maintains the 60 V voltage specification and all current and gain parameters. The TIP125 is in active production status with extensive inventory availability at 31,145 pieces. However, this device is RoHS non-compliant, requiring evaluation against project compliance requirements. The NTE Electronics variant is suitable for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the TIP127G replace the TIP125G in all applications?

A: The TIP127G is electrically compatible with the TIP125G for all applications rated at 60 V or below. The enhanced 100 V rating of the TIP127G provides additional voltage margin and does not degrade performance in lower-voltage circuits. Both devices share identical collector current (5 A), saturation voltage (4V @ 20mA, 5A), and DC current gain (1000 @ 3A, 3V) specifications.

Q: What is the difference between the TIP125G and TIP127G?

A: The primary difference is the maximum collector-emitter breakdown voltage: TIP125G is rated for 60 V, while TIP127G is rated for 100 V. All other electrical parameters, including current capacity, saturation characteristics, and thermal operating range, are identical. The TIP127G is in active production, whereas the TIP125G is obsolete.

Q: Is the NTE Electronics TIP125 a direct replacement for the onsemi TIP125G?

A: The NTE Electronics TIP125 is functionally equivalent to the onsemi TIP125G with identical electrical specifications. Both devices are rated for 60 V, 5 A, and 2 W. The primary distinction is RoHS compliance status: the onsemi TIP125G is ROHS3 compliant, while the NTE Electronics TIP125 is RoHS non-compliant. Component selection should account for project compliance requirements.

Q: Are all three devices in the same package?

A: Yes. The TIP125G, TIP127G, and TIP125 are all housed in the TO-220-3 through-hole package. Pin configuration and mechanical dimensions are identical, enabling direct board-level substitution without layout modifications.

Q: What is the significance of the Darlington configuration?

A: The Darlington configuration combines two transistor stages internally, resulting in very high DC current gain (1000 minimum @ 3A, 3V). This allows the device to switch large collector currents with minimal base drive current, making it suitable for applications requiring high current amplification from low-impedance signal sources.

Q: Can I use the TIP125 or TIP127G in a design originally specified for the TIP125G?

A: Yes. Both substitute parts maintain the electrical specifications required for TIP125G applications. The TIP127G offers enhanced voltage rating for improved design margin. The TIP125 provides cost-effective equivalence but requires verification of RoHS compliance requirements for your application.