TIP126 Equivalent & Substitute Parts

Part Overview

The TIP126 is a PNP Darlington bipolar junction transistor manufactured by STMicroelectronics, housed in a TO-220-3 through-hole package. This component is rated for 80 V collector-emitter breakdown voltage and 5 A maximum collector current, with a maximum power dissipation of 2 W. The TIP126 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, gain characteristics, and thermal performance while accommodating available product status and supply chain considerations.

Substiute Parts

TIP126

STMicroelectronicsIn Stock: 54238TIP126 Datasheet

Current PartRFQ

TIP127

NTE Electronics, IncIn Stock: 62369TIP127 Datasheet

DirectRFQ

TIP126G

onsemiIn Stock: 7978TIP126G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TIP126 are selected based on strict electrical and mechanical compatibility. The primary substitution criteria are:

Mandatory Matching Parameters:

• Transistor Type: PNP - Darlington configuration
• Current - Collector (Ic) (Max): 5 A minimum
• Voltage - Collector Emitter Breakdown (Max): 80 V minimum
• Vce Saturation: 4V @ 20mA, 5A
• Current - Collector Cutoff (Max): 500µA maximum
• DC Current Gain (hFE) (Min): 1000 @ 3A, 3V minimum
• Power - Max: 2 W minimum
• Operating Temperature: 150°C (TJ) maximum
• Package / Case: TO-220-3
• Mounting Type: Through Hole

Identified Substitutes:

TIP127 (NTE Electronics, Inc): Meets all mandatory electrical parameters with enhanced voltage rating (100 V vs. 80 V). Identical current, gain, saturation, and power specifications. Active product status. TO-220-3 package. ROHS3 compliant.

TIP126G (onsemi): Identical electrical specifications to the main TIP126 part. Matches all mandatory parameters exactly. Obsolete product status. TO-220-3 package. ROHS3 compliant. Extended operating temperature range (-65°C ~ 150°C).

Parameter Comparison

Engineering Selection Recommendations

TIP127 (NTE Electronics, Inc) is the preferred substitute for new designs and production continuity. This part maintains all electrical specifications of the TIP126 while offering an elevated voltage rating of 100 V, providing additional design margin in applications where the 80 V rating is marginal. The TIP127 carries active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance and identical TO-220-3 packaging enable direct board-level substitution without layout modifications.

TIP126G (onsemi) provides an exact electrical equivalent to the original TIP126 with identical 80 V voltage rating and all performance parameters. This part is suitable for applications requiring precise specification matching or where design validation has been performed against the original TIP126. The extended operating temperature range (-65°C ~ 150°C) offers additional thermal flexibility compared to the main part. However, obsolete product status may limit long-term availability.

For applications currently using the TIP126, transition to TIP127 is recommended to ensure sustained component availability and supply chain resilience.

Frequently Asked Questions (FAQ)

Q: Can TIP127 be used as a direct replacement for TIP126 in existing designs?

A: Yes. The TIP127 maintains all electrical specifications of the TIP126 including current (5 A), saturation voltage (4V @ 20mA, 5A), gain (1000 @ 3A, 3V), and power rating (2 W). The higher voltage rating (100 V vs. 80 V) does not create incompatibility; it provides additional design margin. Identical TO-220-3 packaging enables direct board-level substitution.

Q: What is the difference between TIP126 and TIP126G?

A: Both parts are PNP Darlington transistors with identical electrical specifications: 80 V breakdown voltage, 5 A collector current, 2 W power dissipation, and 1000 minimum gain. The primary difference is manufacturer: TIP126 is from STMicroelectronics, while TIP126G is from onsemi. TIP126G offers an extended operating temperature range (-65°C ~ 150°C) compared to the TIP126 (150°C maximum). Both are obsolete.

Q: Why is TIP127 rated for 100 V instead of 80 V?

A: TIP127 is a higher-voltage variant of the TIP126 family. The 100 V rating provides additional voltage headroom for applications with higher supply voltages or transient conditions. All other electrical parameters remain identical, making TIP127 a compatible upgrade path.

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

A: Yes. TIP126, TIP127, and TIP126G are all housed in TO-220-3 through-hole packages with identical pin configurations and thermal characteristics. No PCB layout modifications are required for substitution.

Q: What is the product status significance for component selection?

A: Product status indicates supply chain availability. TIP127 carries active status, ensuring continued manufacturing and long-term availability. TIP126 and TIP126G are obsolete, indicating discontinued production. For new designs and production continuity, active-status parts are preferred to avoid future supply disruptions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. TIP126, TIP127, and TIP126G are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic components in regulated markets.