TIP127-BP PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The TIP127-BP is a PNP Darlington bipolar junction transistor manufactured by Micro Commercial Co, rated for 100 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220AB through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement continuity.

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 (Max)	150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TIP127-BP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type classification (PNP configuration)
Maximum collector current rating (5 A)
Maximum collector-emitter breakdown voltage (100 V)
Saturation voltage characteristics (4V @ 20mA, 5A)
Maximum collector cutoff current (500 µA)
Minimum DC current gain (1000 @ specified conditions)
Maximum power dissipation (2 W)

Mechanical Equivalence Criteria:

Through-hole mounting technology
TO-220-3 package footprint compatibility

All identified substitute parts meet these electrical and mechanical requirements. Variations in operating temperature range, product status, and packaging format (tube vs. bag) do not affect functional substitution capability within the specified parameter envelope.

Parameter Comparison

Parameter	TIP127-BP (Micro Commercial Co)	TIP127L-BP (Micro Commercial Co)	TIP127 (NTE Electronics)	TIP127G (onsemi)
Transistor Type	PNP - Darlington	PNP	PNP - Darlington	PNP - Darlington
Current - Collector (Ic) (Max)	5 A	5 A	5 A	5 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A	4V @ 20mA, 5A	4V @ 20mA, 5A	4V @ 20mA, 5A
Current - Collector Cutoff (Max)	500 µA	500 µA	500 µA	500 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3A, 3V	1000 @ 500mA, 3V	1000 @ 3A, 3V	1000 @ 3A, 3V
Power - Max	2 W	2 W	2 W	2 W
Operating Temperature (Max)	150°C (TJ)	150°C	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: TIP127G (onsemi)

The TIP127G from onsemi is the recommended primary substitute. This part maintains full electrical equivalence across all critical parameters, operates across an extended temperature range (-65°C to 150°C), carries active product status, and holds ROHS3 compliance with REACH Unaffected certification. The onsemi TIP127G provides the broadest operational envelope and supply continuity.

Secondary Substitute: TIP127 (NTE Electronics)

The TIP127 from NTE Electronics serves as a secondary substitute option. This part matches all electrical specifications and maintains Darlington configuration identical to the original TIP127-BP. Active product status and ROHS3 compliance support long-term availability. The maximum operating temperature specification (150°C TJ) aligns with the original component.

Tertiary Substitute: TIP127L-BP (Micro Commercial Co)

The TIP127L-BP from Micro Commercial Co provides substitution capability with active product status. This part maintains electrical equivalence across all critical parameters. The DC current gain specification is measured at 500 mA rather than 3 A, representing a minor variation in test conditions that does not affect functional substitution. ROHS3 compliance and REACH Unaffected status are confirmed.

All three substitute parts are electrically and mechanically compatible with applications designed for the TIP127-BP within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can the TIP127L-BP substitute for the TIP127-BP despite the different DC current gain test condition?

A: Yes. The TIP127L-BP maintains the minimum DC current gain specification of 1000, measured at 500 mA instead of 3 A. Both measurements confirm sufficient current amplification for Darlington operation. The saturation voltage and all other electrical parameters remain identical, ensuring functional compatibility.

Q: What is the primary reason to substitute the TIP127-BP?

A: The TIP127-BP is classified as obsolete. The three identified substitute parts—TIP127G, TIP127, and TIP127L-BP—all carry active product status, ensuring ongoing availability and supply chain continuity.

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

A: Yes. All substitute parts use the TO-220-3 through-hole package, providing identical mechanical compatibility and PCB footprint alignment with designs specified for the TIP127-BP.

Q: Do the substitute parts meet the same compliance standards as the original TIP127-BP?

A: All substitute parts are ROHS3 compliant. The TIP127G and TIP127L-BP carry REACH Unaffected certification. The TIP127 from NTE Electronics lists REACH status as Vendor Undefined. All parts carry EAR99 ECCN classification.

Q: What is the difference between the TIP127G and TIP127 in terms of operating temperature?

A: The TIP127G operates across -65°C to 150°C, providing an extended lower temperature range. The TIP127 from NTE Electronics specifies a maximum operating temperature of 150°C (TJ). Both parts support the original TIP127-BP maximum temperature specification of 150°C.

Q: Can I use these substitutes interchangeably in existing designs?

A: Yes. All substitute parts maintain electrical equivalence across collector current, breakdown voltage, saturation voltage, cutoff current, current gain, and power dissipation specifications. Through-hole TO-220-3 package compatibility ensures direct PCB substitution without design modification.

Q: Which substitute offers the best long-term supply availability?

A: The TIP127G from onsemi is recommended for long-term supply assurance. onsemi is a major semiconductor manufacturer with established distribution networks and active product status confirmation. Current inventory of 1970 units supports immediate procurement.

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