2N6547 Equivalent & Substitute Parts

Part Overview

The 2N6547 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 400 V collector-emitter breakdown voltage and 15 A maximum collector current. Designed for chassis mount applications in the TO-3 package, this transistor is classified as obsolete. Due to its obsolete status, equivalent substitute parts are necessary to maintain design continuity and ensure component availability for repair, maintenance, and new production applications.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V
Current - Collector (Ic) (Max)	15 A
Power - Max	175 W
Package / Case	TO-204AA, TO-3
Mounting Type	Chassis Mount
Operating Temperature (Max)	200°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 2N6547 is determined by matching the following critical electrical and mechanical parameters:

Electrical Parameters:

Transistor type: NPN configuration
Voltage rating: 400 V collector-emitter breakdown voltage
Current rating: 15 A maximum collector current
Package compatibility: TO-3 or TO-204AA equivalent

Mechanical Parameters:

Package type: TO-3 or TO-204AD (TO-3 variant)
Mounting configuration: Through hole or chassis mount compatible

The substitute parts 2N6678 and 2N6678T1 satisfy these core requirements. Both are manufactured by Microchip Technology and maintain the same voltage and current ratings as the 2N6547, with compatible TO-3 packaging.

Parameter Comparison

Parameter	2N6547 (Main Part)	2N6678	2N6678T1
Manufacturer	STMicroelectronics	Microchip Technology	Microchip Technology
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	Not specified
Current - Collector (Ic) (Max)	15 A	15 A	Not specified
Package / Case	TO-204AA, TO-3	TO-204AA, TO-3	Not specified
Supplier Device Package	TO-3	TO-204AD (TO-3)	Not specified
Product Status	Obsolete	Active	Active
Operating Temperature (Max)	200°C	200°C	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

2N6678 (Microchip Technology)

The 2N6678 is the primary substitute for the 2N6547. It maintains identical voltage (400 V) and current (15 A) ratings and is packaged in TO-204AD (TO-3), ensuring mechanical and electrical compatibility. The 2N6678 holds active product status, providing long-term availability and supply chain stability. However, the 2N6678 is RoHS non-compliant, which may impact applications requiring RoHS3 compliance. The 2N6547 is RoHS3 compliant, so applications with strict RoHS requirements must evaluate compliance implications before substitution.

2N6678T1 (Microchip Technology)

The 2N6678T1 is an alternative variant of the 2N6678 series, supplied in bulk packaging. This part maintains active product status and shares the same base product number (2N6678). Complete electrical specifications are not provided in the available data; therefore, verification against the 2N6678 datasheet is necessary to confirm parameter equivalence. Like the 2N6678, this part is RoHS non-compliant.

Compliance Considerations

Both substitute parts are REACH unaffected and classified under ECCN EAR99, matching the regulatory classification of the 2N6547. The primary compliance difference is RoHS status: the 2N6547 is RoHS3 compliant, while both 2N6678 variants are non-compliant. Applications subject to RoHS3 requirements must address this discrepancy through design review or alternative sourcing.

Frequently Asked Questions (FAQ)

Q: Can the 2N6678 directly replace the 2N6547 in existing designs?

A: The 2N6678 matches the critical electrical parameters (400 V, 15 A) and uses compatible TO-3 packaging. However, RoHS compliance status differs between the parts. Designs requiring RoHS3 compliance must evaluate whether substitution is permissible under applicable regulations.

Q: What is the difference between 2N6678 and 2N6678T1?

A: Both parts share the same base product number (2N6678) and are manufactured by Microchip Technology. The 2N6678T1 is supplied in bulk packaging, while the 2N6678 is supplied in standard packaging. Complete electrical specifications for the 2N6678T1 are not provided; confirmation of parameter equivalence with the 2N6678 is required.

Q: Are there packaging differences between the 2N6547 and substitute parts?

A: The 2N6547 is specified as chassis mount TO-3, while the 2N6678 is specified as through-hole TO-204AD (TO-3). Both use the TO-3 package form factor, ensuring mechanical compatibility. Mounting configuration differences (chassis mount versus through-hole) must be evaluated for specific application requirements.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching transistor type (NPN), voltage rating (400 V collector-emitter breakdown), current rating (15 A maximum collector current), and package compatibility (TO-3). These parameters ensure functional equivalence in the target application.

Q: Why is the 2N6547 classified as obsolete?

A: The 2N6547 is no longer in active production by STMicroelectronics. The substitute parts 2N6678 and 2N6678T1 maintain active product status, providing continued availability and supply chain support.

Q: How do the power ratings compare between the main part and substitutes?

A: The 2N6547 is rated for 175 W maximum power dissipation. The 2N6678 is rated for 3 W maximum power dissipation. This significant difference indicates that the 2N6678 is designed for lower power applications. Applications requiring the full 175 W capability of the 2N6547 may not be suitable for the 2N6678 substitute.

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