2N6059 Equivalent & Substitute Parts

Part Overview

The 2N6059 is an NPN Darlington bipolar junction transistor manufactured by STMicroelectronics, rated for 100 V collector-emitter breakdown voltage and 12 A maximum collector current. Housed in a TO-3 chassis mount package, this component is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

2N6059

STMicroelectronicsIn Stock: 12082N6059 Datasheet

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2N6059

Microchip TechnologyIn Stock: 7792N6059 Datasheet

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2N6284G

onsemiIn Stock: 22062N6284G Datasheet

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MJ11022G

onsemiIn Stock: 1160MJ11022G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N6059 NPN Darlington transistor is determined by the following critical parameters:

Primary Substitution Criteria:

• Transistor type classification (NPN - Darlington topology)
• Collector-emitter breakdown voltage rating (minimum 100 V)
• Maximum collector current capacity (minimum 12 A)
• Vce saturation characteristics
• DC current gain (hFE) specifications
• Power dissipation capability (minimum 150 W)
• Package compatibility (TO-3 / TO-204AA form factor)

Substitution Logic: Parts are grouped as direct substitutes when they maintain or exceed the electrical performance envelope of the 2N6059 while preserving the same package footprint and mounting methodology. The 2N6284G and MJ11022G are classified as active product alternatives that satisfy the core functional requirements of the 2N6059 within their respective electrical ratings.

Parameter Comparison

Engineering Selection Recommendations

2N6284G (onsemi) is the primary substitute for the 2N6059. This part maintains identical collector-emitter breakdown voltage (100 V) and exceeds the collector current specification (20 A versus 12 A). The 2N6284G is ROHS3 compliant, carries active product status, and is available in the same TO-3 package. The increased current rating and power dissipation (160 W) provide design margin for the 2N6059 application envelope.

MJ11022G (onsemi) is a secondary substitute suitable for applications requiring higher voltage operation. This part provides 250 V collector-emitter breakdown voltage and 15 A collector current capacity, with 175 W power dissipation. The MJ11022G is ROHS3 compliant and active product status. Selection of this part is appropriate when circuit design permits operation at elevated voltage ratings or when enhanced voltage margin is required.

Both substitute parts are manufactured by onsemi, carry ROHS3 compliance certification, and maintain the TO-3 package form factor. The 2N6059 from Microchip Technology listed in the substitute set is classified as RoHS non-compliant and is not recommended for new designs requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 2N6284G directly replace the 2N6059 in existing designs?

A: The 2N6284G is electrically compatible with the 2N6059 for applications operating at or below 100 V collector-emitter voltage and 12 A collector current. Both parts share identical voltage and current ratings within the 2N6059 operating envelope. The 2N6284G provides additional performance margin through higher current capacity (20 A) and power rating (160 W). Physical package compatibility is maintained in the TO-3 form factor.

Q: What is the difference between chassis mount and through-hole mounting for the 2N6059 and its substitutes?

A: The 2N6059 is specified as chassis mount, while the 2N6284G and MJ11022G are through-hole mounted. Both mounting types utilize the TO-3 package form factor. Chassis mount configuration typically involves direct mounting to a heat sink or chassis structure. Through-hole mounting requires PCB pad preparation. Thermal performance and mechanical integration must be evaluated for the specific application.

Q: Why is the MJ11022G rated for 250 V when the 2N6059 is rated for 100 V?

A: The MJ11022G is a higher-voltage variant within the NPN Darlington family. The 250 V rating reflects the maximum collector-emitter breakdown voltage specification for that device. The MJ11022G can operate safely at 100 V and below, making it suitable for 2N6059 replacement in circuits not requiring the full 250 V capability. Selection of the MJ11022G is appropriate when circuit design includes voltage transients or when future design modifications may require higher voltage operation.

Q: Are all substitute parts RoHS compliant?

A: The 2N6284G and MJ11022G are both ROHS3 compliant. The 2N6059 from Microchip Technology is RoHS non-compliant and is not suitable for applications requiring regulatory compliance. The original 2N6059 from STMicroelectronics is ROHS3 compliant.

Q: What is the significance of DC current gain (hFE) differences between substitute parts?

A: The 2N6059 specifies minimum hFE of 750 at 6 A and 3 V. The 2N6284G maintains this specification at 10 A and 3 V. The MJ11022G specifies minimum hFE of 400 at 10 A and 5 V. Higher hFE values indicate greater current amplification capability. The 2N6284G provides equivalent or superior gain characteristics. The MJ11022G exhibits lower gain but remains suitable for applications where the specified gain margin is sufficient.

Q: Can the 2N6059 be used interchangeably with the 2N6059 from Microchip Technology?

A: The Microchip Technology 2N6059 shares the same part number but is classified as RoHS non-compliant, whereas the STMicroelectronics 2N6059 is ROHS3 compliant. The Microchip part is described as a PNP power transistor, which differs fundamentally from the NPN Darlington topology of the STMicroelectronics version. These parts are not interchangeable and serve different circuit functions.