TIP126 PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The TIP126 is a PNP Darlington bipolar junction transistor manufactured by Central Semiconductor Corp, rated for 80 V collector-emitter breakdown voltage and 5 A maximum collector current. Designed for Through Hole mounting in TO-220-3 package, this component is classified as Obsolete product status. Due to obsolescence and limited ongoing availability from original manufacturers, identifying equivalent substitute parts is necessary for design continuity and procurement planning in legacy system maintenance and new designs requiring compatible performance characteristics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	-
Current - Collector (Ic) Max	5	A
Voltage - Collector Emitter Breakdown (Max)	80	V
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A	-
Current - Collector Cutoff (Max)	500	µA
DC Current Gain (hFE) Min @ Ic, Vce	1000 @ 3A, 3V	-
Power - Max	65	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution eligibility for the TIP126 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

Acceptable Variation Parameters:

Power dissipation rating may vary provided thermal management design accommodates the specific rating
Frequency - Transition specifications may differ if not critical to application
RoHS and REACH compliance status may differ based on procurement requirements

The TIP126G from onsemi meets all mandatory matching parameters and qualifies as a direct substitute.

Parameter Comparison

Parameter	TIP126 (Central Semiconductor)	TIP126G (onsemi)	Unit
Transistor Type	PNP - Darlington	PNP - Darlington	-
Current - Collector (Ic) Max	5	5	A
Voltage - Collector Emitter Breakdown (Max)	80	80	V
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A	4V @ 20mA, 5A	-
Current - Collector Cutoff (Max)	500	500	µA
DC Current Gain (hFE) Min @ Ic, Vce	1000 @ 3A, 3V	1000 @ 3A, 3V	-
Operating Temperature Range	-65 to 150	-65 to 150	°C (TJ)
Package / Case	TO-220-3	TO-220-3	-
Mounting Type	Through Hole	Through Hole	-
Power - Max	65	2	W
RoHS Status	RoHS non-compliant	ROHS3 Compliant	-
Product Status	Obsolete	Obsolete	-

Engineering Selection Recommendations

TIP126G (onsemi) as Primary Substitute:

The TIP126G meets all mandatory electrical and mechanical parameters specified for the TIP126. Both components are classified as Obsolete, indicating limited future availability. The TIP126G provides ROHS3 compliance, which may be advantageous for procurement in regulated markets. The power dissipation rating difference (2 W vs. 65 W) reflects different thermal design specifications; applications requiring the full 65 W dissipation capability must evaluate thermal management requirements independently.

Compliance Considerations:

Selection between TIP126 and TIP126G should account for RoHS compliance requirements in the target application. Both components are REACH Unaffected and classified under ECCN EAR99. The TIP126G's ROHS3 compliance status may be required for certain procurement or regulatory contexts.

Inventory and Availability:

Current inventory levels show TIP126 at 54,200 pieces and TIP126G at 7,960 pieces. Long-term design decisions should account for the Obsolete status of both components and consider planning for future technology transitions.

Frequently Asked Questions (FAQ)

Q: Can TIP126G replace TIP126 in existing designs?

A: Yes. The TIP126G meets all mandatory electrical specifications: 5 A collector current, 80 V breakdown voltage, 4V saturation voltage at specified conditions, 1000 hFE minimum, and identical TO-220-3 Through Hole package. Electrical performance is equivalent for circuit operation.

Q: What is the significance of the power rating difference between TIP126 (65 W) and TIP126G (2 W)?

A: Power rating reflects maximum continuous dissipation under specified thermal conditions. The TIP126G's lower rating does not indicate reduced electrical capability at rated current and voltage. Thermal management design must accommodate the specific power rating of the selected component. Applications operating at maximum current and voltage conditions require thermal analysis based on the chosen part's rating.

Q: Are both parts suitable for new designs?

A: Both TIP126 and TIP126G are classified as Obsolete. While currently available in inventory, long-term design decisions should consider the obsolescence status. New designs may benefit from evaluating current-generation PNP Darlington alternatives for extended product lifecycle support.

Q: What are the package compatibility requirements?

A: Both components use TO-220-3 Through Hole package with identical pinout and mechanical dimensions. PCB layouts and heatsink mounting designs are directly compatible between TIP126 and TIP126G.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance status reflects manufacturing process and material composition, not electrical characteristics. Both RoHS non-compliant (TIP126) and ROHS3 compliant (TIP126G) versions deliver identical electrical performance. Selection should be based on procurement and regulatory requirements.

Q: Are there frequency limitations for high-speed applications?

A: The TIP126 specifies 4 MHz transition frequency. The TIP126G does not provide frequency specification in available data. Applications requiring specific frequency performance should verify compatibility with actual circuit operating conditions.

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