Equivalent & Substitute Parts for 2N6043

Part Overview

The 2N6043 is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 8 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives with comparable or enhanced electrical characteristics are available from both onsemi and STMicroelectronics.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	8	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	2V @ 16mA, 4A	—
Current - Collector Cutoff (Max)	20	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 4A, 4V	—
Power - Max	75	W
Operating Temperature	-65 to 150	°C (TJ)
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the 2N6043 is determined by the following critical parameters: transistor type (NPN Darlington), maximum collector current (8 A), package configuration (TO-220-3 through-hole), and operating temperature range. Substitute parts must maintain compatibility with these core specifications.

The 2N6043G represents a direct equivalent from onsemi with identical electrical ratings but active product status and improved compliance. The BDX53B and TIP102 are similar alternatives from STMicroelectronics that share the same collector current rating and package type but differ in voltage ratings and power dissipation specifications. These alternatives are suitable for applications where the voltage and power requirements align with the original design parameters.

Parameter Comparison

Parameter	2N6043	2N6043G	BDX53B	TIP102
Manufacturer	onsemi	onsemi	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington
Current - Collector (Ic) (Max)	8 A	8 A	8 A	8 A
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	80 V	100 V
Vce Saturation (Max) @ Ib, Ic	2V @ 16mA, 4A	2V @ 16mA, 4A	2V @ 12mA, 3A	2.5V @ 80mA, 8A
Current - Collector Cutoff (Max)	20 µA	20 µA	500 µA	50 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 4A, 4V	1000 @ 4A, 4V	750 @ 3A, 3V	1000 @ 3A, 4V
Power - Max	75 W	75 W	60 W	2 W
Operating Temperature	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)	150 °C (TJ)	150 °C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2N6043G (onsemi): This part is the direct equivalent of the 2N6043 with identical electrical specifications and TO-220-3 packaging. The 2N6043G is active in production and ROHS3 compliant, making it the primary choice for direct replacement in existing designs. No circuit modifications are required.

BDX53B (STMicroelectronics): This substitute offers higher voltage rating (80 V versus 60 V) and is suitable for applications requiring enhanced voltage margin. The BDX53B maintains 8 A collector current and TO-220-3 packaging. Power dissipation is rated at 60 W, which is lower than the 2N6043. This part is ROHS3 compliant and active in production.

TIP102 (STMicroelectronics): This substitute provides the highest voltage rating (100 V) among the alternatives. The TIP102 maintains 8 A collector current and TO-220-3 packaging. Power dissipation is rated at 2 W, significantly lower than the original specification. This part is ROHS3 compliant and active in production. Selection of TIP102 is appropriate only for applications where the reduced power rating does not constrain thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the 2N6043G be used as a direct replacement for the 2N6043?

A: Yes. The 2N6043G is manufactured by onsemi with identical electrical specifications, including 60 V breakdown voltage, 8 A collector current, 75 W power rating, and TO-220-3 package configuration. The 2N6043G is active in production and ROHS3 compliant.

Q: What are the key differences between the 2N6043 and BDX53B?

A: The BDX53B has a higher collector-emitter breakdown voltage (80 V versus 60 V) and lower maximum power dissipation (60 W versus 75 W). Both devices share 8 A collector current and TO-220-3 packaging. The BDX53B is suitable for applications requiring higher voltage headroom.

Q: Is the TIP102 suitable for all 2N6043 applications?

A: The TIP102 shares the 8 A collector current and TO-220-3 package with the 2N6043 but has significantly reduced power dissipation (2 W versus 75 W). Selection of TIP102 requires verification that the application's thermal requirements do not exceed the 2 W rating. The TIP102 offers higher voltage rating (100 V).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 2N6043G, BDX53B, and TIP102 are all ROHS3 compliant. The original 2N6043 is RoHS non-compliant.

Q: Do the substitute parts require circuit modifications?

A: The 2N6043G requires no circuit modifications. The BDX53B and TIP102 may require thermal design review due to differences in power dissipation specifications. Electrical pin configuration and TO-220-3 package dimensions are identical across all parts.

Q: What is the inventory status of these substitute parts?

A: The 2N6043G has 2200 pieces in stock. The BDX53B has 7363 pieces in stock. The TIP102 has 23053 pieces in stock. All parts are listed as new original stock.

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