2N6045 NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The 2N6045 is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 8 A maximum collector current in a TO-220 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The 2N6045 is suitable for applications requiring high current gain and moderate power dissipation in switching and amplification circuits.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	8	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max) @ Ib, Ic	2 V @ 12 mA, 3 A	—
Current - Collector Cutoff (Max)	20	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3 A, 4 V	—
Power - Max	75	W
Operating Temperature	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 2N6045 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Darlington configuration
Current - Collector (Ic) (Max): 8 A minimum
Voltage - Collector Emitter Breakdown (Max): 100 V minimum
Package / Case: TO-220-3 form factor
Mounting Type: Through Hole

Secondary Compatibility Parameters:

DC Current Gain (hFE): Minimum 1000 @ specified Ic and Vce conditions
Vce Saturation characteristics within acceptable operating range
Operating Temperature range: -65°C to 150°C (TJ)

Substitute parts are classified into two categories:

Direct Equivalent: Parts that maintain identical electrical specifications and are pin-compatible replacements.

Similar Equivalent: Parts that meet or exceed the primary substitution criteria but may exhibit variations in secondary parameters such as power dissipation rating, collector cutoff current, or saturation voltage characteristics. These parts are functionally compatible for the specified application envelope.

Parameter Comparison

Parameter	2N6045	2N6045G	BDX53C	TIP102	TIP132
Manufacturer	onsemi	onsemi	onsemi	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Obsolete	Active	Active
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington
Current - Collector (Ic) (Max)	8 A	8 A	8 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	2 V @ 12 mA, 3 A	2 V @ 12 mA, 3 A	2 V @ 12 mA, 3 A	2.5 V @ 80 mA, 8 A	4 V @ 30 mA, 6 A
Current - Collector Cutoff (Max)	20 µA	20 µA	500 µA	50 µA	500 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3 A, 4 V	1000 @ 3 A, 4 V	750 @ 3 A, 3 V	1000 @ 3 A, 4 V	1000 @ 4 A, 4 V
Power - Max	75 W	75 W	60 W	2 W	2 W
Operating Temperature	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)	150 °C (TJ)	150 °C (TJ)	150 °C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2N6045G (Direct Equivalent - Recommended Primary Substitute)

The 2N6045G is the direct equivalent of the 2N6045, manufactured by onsemi with identical electrical specifications. This part maintains the full 75 W power rating and -65°C to 150°C operating temperature range. The 2N6045G holds Active product status and is ROHS3 compliant, making it the preferred choice for new designs and production continuity. Inventory availability is 1153 pieces in tube packaging.

TIP102 (Similar Equivalent - Active Status)

The TIP102, manufactured by STMicroelectronics, meets all primary substitution criteria with 8 A collector current and 100 V breakdown voltage. This part is ROHS3 compliant and maintains Active product status. The TIP102 exhibits a higher Vce saturation voltage (2.5 V @ 80 mA, 8 A) and significantly lower power rating (2 W) compared to the 2N6045. Selection of TIP102 is appropriate for applications where the reduced power dissipation rating is acceptable and thermal management requirements are less stringent. Inventory availability is 23053 pieces in tube packaging.

TIP132 (Similar Equivalent - Active Status)

The TIP132, manufactured by STMicroelectronics, meets all primary substitution criteria with 8 A collector current and 100 V breakdown voltage. This part is ROHS3 compliant and maintains Active product status. The TIP132 exhibits elevated Vce saturation voltage (4 V @ 30 mA, 6 A) and reduced power rating (2 W) compared to the 2N6045. Selection of TIP132 is appropriate for applications where the reduced power dissipation rating is acceptable. Inventory availability is 15354 pieces in tube packaging.

BDX53C (Similar Equivalent - Obsolete Status)

The BDX53C, manufactured by onsemi, meets all primary substitution criteria with 8 A collector current and 100 V breakdown voltage. This part is classified as Obsolete and is not ROHS3 compliant. The BDX53C exhibits a reduced power rating (60 W) and elevated collector cutoff current (500 µA) compared to the 2N6045. Selection of BDX53C is not recommended for new designs due to obsolete status, but remains available for legacy system support with 21470 pieces in inventory.

Frequently Asked Questions (FAQ)

Q: Can the 2N6045G be used as a direct replacement for the 2N6045?

A: Yes. The 2N6045G is the direct equivalent manufactured by onsemi with identical electrical specifications, including 8 A collector current, 100 V breakdown voltage, 75 W power rating, and -65°C to 150°C operating temperature range. Pin configuration and package form factor are identical. The 2N6045G is the recommended substitute for the obsolete 2N6045.

Q: What is the primary difference between the 2N6045 and TIP102?

A: Both devices share identical maximum collector current (8 A) and breakdown voltage (100 V) ratings. The primary differences are power dissipation rating (2N6045: 75 W; TIP102: 2 W) and Vce saturation characteristics (2N6045: 2 V @ 12 mA, 3 A; TIP102: 2.5 V @ 80 mA, 8 A). The TIP102 is suitable for applications with lower power dissipation requirements.

Q: Are TIP102 and TIP132 interchangeable with the 2N6045?

A: Both TIP102 and TIP132 meet the primary substitution criteria of 8 A collector current, 100 V breakdown voltage, and TO-220-3 package configuration. However, both devices have significantly lower power ratings (2 W) compared to the 2N6045 (75 W). These parts are functionally compatible for applications where thermal management and power dissipation requirements align with their reduced ratings. Verification of thermal performance in the target application is necessary.

Q: What is the significance of the collector cutoff current difference between these parts?

A: Collector cutoff current (Icbo) represents leakage current in the off state. The 2N6045 specifies 20 µA maximum, while BDX53C and TIP132 specify 500 µA maximum. Higher leakage current may affect circuit performance in precision applications requiring minimal standby current. For switching applications with moderate current levels, this difference is typically not significant.

Q: Why is the 2N6045G recommended over other substitutes?

A: The 2N6045G is recommended because it is the direct equivalent with identical electrical specifications, maintains the full 75 W power rating, holds Active product status, and is ROHS3 compliant. These factors ensure seamless integration into existing designs without thermal or performance compromises.

Q: Can the BDX53C be used in new designs?

A: The BDX53C is classified as Obsolete and is not ROHS3 compliant. While it meets the primary substitution criteria, it is not recommended for new designs. The BDX53C remains available for legacy system support and repair applications only.

Q: What packaging options are available for these substitute parts?

A: The 2N6045G is supplied in tube packaging. The TIP102 and TIP132 are supplied in tube packaging. The BDX53C packaging specification is not provided. All parts utilize the TO-220-3 through-hole package form factor.

Q: Are all substitute parts ROHS3 compliant?

A: No. The 2N6045G, TIP102, and TIP132 are ROHS3 compliant. The 2N6045 and BDX53C are not ROHS3 compliant. For applications requiring ROHS3 compliance, selection must be limited to 2N6045G, TIP102, or TIP132.

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