TIP126 Equivalent & Substitute Parts

Part Overview

The TIP126 is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 through-hole package. This component is classified as obsolete product status. Due to obsolescence, equivalent substitute parts with matching electrical and mechanical specifications are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
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
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3A, 3V
Power - Max	2 W
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature (Max)	150°C (TJ)

Substitute Part Grouping Explanation

Substitution of the TIP126 is determined by equivalence across the following critical parameters:

Transistor Type: PNP - Darlington configuration
Maximum Collector Current: 5 A rating
Collector-Emitter Breakdown Voltage: 80 V rating
Saturation Voltage: 4V @ 20mA, 5A
DC Current Gain: 1000 @ 3A, 3V minimum
Power Dissipation: 2 W maximum
Package: TO-220-3 through-hole mounting

The TIP126G qualifies as a direct substitute based on matching all electrical specifications and package requirements. Both components share identical collector current, breakdown voltage, saturation voltage, current gain, and power ratings. Package designation differences (TO-220-3 versus TO-220) represent equivalent mechanical specifications for through-hole mounting applications.

Parameter Comparison

Parameter	TIP126	TIP126G
Transistor Type	PNP - Darlington	PNP - Darlington
Current - Collector (Ic) (Max)	5 A	5 A
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A	4V @ 20mA, 5A
Current - Collector Cutoff (Max)	2mA	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3A, 3V	1000 @ 3A, 3V
Power - Max	2 W	2 W
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)
RoHS Status	Not specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The TIP126G is a direct electrical and mechanical equivalent to the TIP126. Both components are classified as obsolete product status and share identical core electrical parameters: 5 A collector current, 80 V breakdown voltage, 4V saturation voltage, and 1000 minimum DC current gain.

The TIP126G provides additional compliance certification with ROHS3 compliance status, whereas the TIP126 compliance status is not specified. For applications requiring regulatory compliance with current environmental standards, the TIP126G is the appropriate selection.

The TIP126G exhibits lower collector cutoff current (500µA versus 2mA), which represents improved leakage characteristics and may provide enhanced performance in low-power switching applications.

Both components are rated for identical maximum operating temperature of 150°C junction temperature and utilize through-hole TO-220-3 package mounting, ensuring direct mechanical and thermal compatibility in existing circuit board designs.

Frequently Asked Questions (FAQ)

Q: Can TIP126G replace TIP126 in existing designs?

A: Yes. The TIP126G is a direct substitute with matching electrical specifications across all critical parameters: collector current (5 A), breakdown voltage (80 V), saturation voltage (4V @ 20mA, 5A), and DC current gain (1000 @ 3A, 3V). Both components use identical TO-220-3 through-hole packaging.

Q: What is the difference between TO-220-3 and TO-220 package designations?

A: Both designations refer to equivalent through-hole package formats with three leads suitable for TO-220 mounting. The specifications provided indicate these packages are mechanically and electrically compatible for this application.

Q: Does the lower collector cutoff current in TIP126G affect circuit operation?

A: The TIP126G exhibits 500µA maximum collector cutoff current compared to 2mA in the TIP126. This represents improved leakage performance and does not negatively affect circuit operation. In applications sensitive to leakage current, the TIP126G provides superior characteristics.

Q: Are there compliance differences between TIP126 and TIP126G?

A: The TIP126G carries ROHS3 compliance certification. Both components maintain REACH Unaffected status. For applications requiring current environmental compliance standards, the TIP126G is the appropriate selection.

Q: What is the operating temperature range for these components?

A: Both TIP126 and TIP126G are rated for maximum junction temperature of 150°C. The TIP126G specifies an operating temperature range of -65°C to 150°C. Verify application requirements against these thermal specifications.

Q: Are these components suitable for new designs?

A: Both TIP126 and TIP126G are classified as obsolete product status. For new designs, consult onsemi product documentation for current-generation PNP Darlington transistor alternatives with equivalent electrical specifications.

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