TIP127 PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The TIP127 is a PNP Darlington bipolar junction transistor rated for 100 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete by the original onsemi manufacturer, necessitating identification of active equivalent and substitute components for new designs and production applications. Direct equivalents and higher-current alternatives are available from multiple manufacturers with identical or enhanced electrical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Current - Collector (Ic) (Max)	5	A
Voltage - Collector Emitter Breakdown (Max)	100	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	2	W
Operating Temperature	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the TIP127 is determined by the following critical parameters: transistor type (PNP Darlington), collector-emitter breakdown voltage (100 V minimum), collector current rating (5 A minimum for direct equivalents), package type (TO-220-3), and mounting configuration (through-hole).

Direct Equivalents maintain identical electrical specifications across all key parameters and are suitable for one-to-one replacement in existing designs. These include the TIP127G (onsemi, active status) and TIP127 (NTE Electronics, active status).

Pin-Compatible Substitutes with Enhanced Ratings share the same package and pinout but offer higher current capacity or power dissipation. The TIP137 (STMicroelectronics) provides 8 A collector current while maintaining 100 V breakdown voltage and TO-220-3 packaging. The BDX54C (STMicroelectronics) offers 8 A collector current and significantly increased power rating (60 W versus 2 W), enabling use in higher-power applications while maintaining electrical compatibility.

All substitute parts are RoHS3 compliant and REACH unaffected, supporting modern manufacturing and environmental requirements.

Parameter Comparison

Parameter	TIP127 (onsemi)	TIP127G (onsemi)	TIP127 (NTE Electronics)	TIP137 (STMicroelectronics)	BDX54C (STMicroelectronics)
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington
Current - Collector (Ic) (Max)	5 A	5 A	5 A	8 A	8 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A	4V @ 20mA, 5A	4V @ 20mA, 5A	4V @ 30mA, 6A	2V @ 12mA, 3A
Current - Collector Cutoff (Max)	500 µA	500 µA	500 µA	500 µA	500 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3A, 3V	1000 @ 3A, 3V	1000 @ 3A, 3V	1000 @ 4A, 4V	750 @ 3A, 3V
Power - Max	2 W	2 W	2 W	2 W	60 W
Operating Temperature	-65 to 150 °C	-65 to 150 °C	150 °C	150 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select TIP127G (onsemi) or TIP127 (NTE Electronics) when the original TIP127 is no longer available. Both maintain the 5 A collector current rating, 100 V breakdown voltage, and 2 W power dissipation. TIP127G and NTE Electronics TIP127 are both active products with RoHS3 compliance, supporting modern manufacturing standards. The TIP127G is supplied in tube packaging, while the NTE Electronics variant is supplied in bag packaging.

For Enhanced Current Capacity: Select TIP137 (STMicroelectronics) when designs require higher collector current (8 A) while maintaining the same 100 V breakdown voltage and TO-220-3 package. This part is active, RoHS3 compliant, and suitable for applications approaching the 5 A limit of the original TIP127.

For High-Power Applications: Select BDX54C (STMicroelectronics) when thermal dissipation requirements exceed 2 W. The BDX54C provides 8 A collector current and 60 W power rating in the same TO-220-3 package, enabling use in power amplifier and switching applications. This part is active and RoHS3 compliant. Note that the BDX54C exhibits lower saturation voltage (2V @ 12mA, 3A) and reduced DC current gain (750 @ 3A, 3V) compared to the TIP127.

All substitute parts maintain TO-220-3 through-hole packaging and are compatible with existing PCB layouts and thermal management solutions designed for the TIP127.

Frequently Asked Questions (FAQ)

Q: Can TIP127G be used as a direct replacement for the obsolete TIP127 from onsemi?

A: Yes. The TIP127G maintains identical electrical specifications: 5 A collector current, 100 V breakdown voltage, 4V saturation voltage at rated conditions, 1000 minimum DC current gain, and 2 W power dissipation. Both use TO-220-3 through-hole packaging. The primary difference is product status (TIP127G is active) and RoHS compliance (TIP127G is ROHS3 compliant).

Q: What is the difference between TIP127 and TIP137?

A: The TIP137 provides higher collector current (8 A versus 5 A) and is manufactured by STMicroelectronics rather than onsemi. Both maintain 100 V breakdown voltage and TO-220-3 packaging. The TIP137 is suitable for applications requiring current capacity beyond 5 A. Saturation voltage specifications differ slightly: TIP137 is rated at 4V @ 30mA, 6A versus TIP127 at 4V @ 20mA, 5A.

Q: When should BDX54C be selected instead of TIP137?

A: Select BDX54C when power dissipation requirements exceed 2 W. The BDX54C is rated for 60 W maximum power, compared to 2 W for both TIP127 and TIP137. Both BDX54C and TIP137 provide 8 A collector current and 100 V breakdown voltage. The BDX54C exhibits superior saturation characteristics (2V @ 12mA, 3A) but lower DC current gain (750 versus 1000).

Q: Are all substitute parts RoHS compliant?

A: TIP127G, TIP127 (NTE Electronics), TIP137, and BDX54C are all ROHS3 compliant. The original onsemi TIP127 is RoHS non-compliant. For applications requiring RoHS compliance, use only the active substitute parts listed.

Q: Do all substitute parts use the same TO-220-3 package?

A: Yes. All substitute parts (TIP127G, TIP127 from NTE Electronics, TIP137, and BDX54C) use TO-220-3 through-hole packaging with identical pinout. They are mechanically compatible with existing PCB layouts and thermal management solutions designed for the original TIP127.

Q: What is the difference in packaging between TIP127G and NTE Electronics TIP127?

A: TIP127G is supplied in tube packaging, while the NTE Electronics TIP127 is supplied in bag packaging. Electrical specifications and performance are identical. Selection between these two depends on procurement requirements and handling preferences.

Q: Can BDX54C be used in all applications designed for TIP127?

A: BDX54C is electrically compatible and pin-compatible with TIP127 in TO-220-3 packaging. However, the reduced DC current gain (750 versus 1000) and different saturation voltage characteristics (2V @ 12mA, 3A versus 4V @ 20mA, 5A) may affect circuit performance in applications with tight gain or saturation specifications. Verify circuit operation before production deployment.

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