TIP125-BP Equivalent & Substitute Parts

Part Overview

The TIP125-BP is a PNP Darlington bipolar junction transistor manufactured by Micro Commercial Co, rated for 60 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220AB through-hole package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Substiute Parts

TIP125-BP

Micro Commercial CoIn Stock: 1162TIP125-BP Datasheet

Current PartRFQ

TIP127L-BP

Micro Commercial CoIn Stock: 7235TIP127L-BP Datasheet

SimilarRFQ

TIP125

NTE Electronics, IncIn Stock: 31192TIP125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TIP125-BP is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Transistor type must be PNP configuration
• Collector-emitter breakdown voltage must equal or exceed 60 V
• Maximum collector current must equal or exceed 5 A
• Vce saturation characteristics must be compatible at specified base and collector currents
• DC current gain (hFE) must meet or exceed 1000 at the specified operating point
• Maximum power dissipation must equal or exceed 2 W

Mechanical Compatibility Requirements:

• Package type must be TO-220-3 or TO-220AB (equivalent mechanical form factors)
• Mounting type must be through-hole
• Pin configuration must be compatible with TO-220 standard

Compliance Requirements:

• RoHS3 compliance preferred for new designs
• REACH unaffected status acceptable

Substitute parts are grouped into two categories: direct equivalents (same base product number from alternative manufacturers) and functional substitutes (different part numbers with equal or superior electrical ratings within the same package family).

Parameter Comparison

Engineering Selection Recommendations

TIP125 (NTE Electronics, Inc)

This part is a direct equivalent to the TIP125-BP, sharing the same base product number and identical electrical specifications including 60 V breakdown voltage, 5 A collector current, and Darlington configuration. The NTE Electronics version is currently in active production status with significantly higher inventory availability (31,145 pcs). The primary consideration is RoHS compliance status: this variant is RoHS non-compliant, whereas the original Micro Commercial Co part is ROHS3 compliant. Selection of this substitute requires confirmation that RoHS non-compliance is acceptable for the application and end-use market.

TIP127L-BP (Micro Commercial Co)

This part functions as an electrical substitute with enhanced voltage rating (100 V versus 60 V) while maintaining identical current capacity (5 A), saturation characteristics, power rating, and package form factor. The TIP127L-BP is a standard PNP transistor rather than a Darlington configuration, resulting in different DC current gain measurement conditions (1000 @ 500mA, 3V versus 1000 @ 3A, 3V). This part maintains ROHS3 compliance and is in active production with high inventory availability (7,167 pcs). The higher voltage rating provides design margin for applications with voltage transients or supply variations. The non-Darlington topology may require circuit design review if base drive characteristics differ significantly from the original Darlington implementation.

Frequently Asked Questions (FAQ)

Q: Can the TIP127L-BP directly replace the TIP125-BP in all applications?

A: The TIP127L-BP provides electrical substitution with superior voltage rating (100 V versus 60 V) and maintains identical current and power specifications. However, the TIP127L-BP is a standard PNP transistor, not a Darlington configuration. Applications relying on the high current gain characteristic of Darlington transistors require circuit analysis to confirm base drive requirements remain within acceptable limits.

Q: What is the primary difference between the TIP125-BP and the NTE Electronics TIP125?

A: Both parts are electrically identical PNP Darlington transistors with 60 V breakdown voltage and 5 A current rating in TO-220-3 packages. The NTE Electronics version is currently in active production, whereas the Micro Commercial Co version is obsolete. The NTE part is RoHS non-compliant, while the original is ROHS3 compliant. Regulatory and compliance requirements determine suitability for specific applications.

Q: Are all three parts mechanically interchangeable?

A: Yes. All three parts use the TO-220-3 through-hole package with identical pin configuration and mechanical form factor. Direct physical substitution in PCB layouts and heat sink mounting arrangements is possible without modification.

Q: Which substitute should be selected for new designs?

A: For new designs requiring RoHS3 compliance, the TIP127L-BP is the preferred substitute, offering active production status, higher voltage rating, and full regulatory compliance. For applications where RoHS compliance is not required, the NTE Electronics TIP125 provides a direct electrical equivalent with higher inventory availability.

Q: Does the higher voltage rating of the TIP127L-BP affect circuit performance?

A: The 100 V breakdown voltage of the TIP127L-BP provides additional design margin compared to the 60 V rating of the TIP125-BP. In applications operating below 60 V, this higher rating does not affect performance but provides protection against transient overvoltage conditions. Circuits designed for the TIP125-BP operate identically with the TIP127L-BP at equivalent voltage levels.

Q: What packaging formats are available for these substitutes?

A: The TIP125-BP is supplied in bulk packaging. The TIP127L-BP is supplied in tube packaging. The NTE Electronics TIP125 is supplied in bag packaging. All three parts are available in quantities suitable for production assembly and prototyping applications.