BUT100 Equivalent & Substitute Parts

Part Overview

The BUT100 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 125 V collector-emitter breakdown voltage and 50 A maximum collector current in a TO-3 through-hole package. This device is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

BUT100

STMicroelectronicsIn Stock: 787BUT100 Datasheet

Current PartRFQ

2N6274

Microchip TechnologyIn Stock: 22822N6274 Datasheet

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2N6275

Microchip TechnologyIn Stock: 10012N6275 Datasheet

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2N6276

Microchip TechnologyIn Stock: 10762N6276 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BUT100 are identified based on the following critical parameters:

Electrical Compatibility Criteria:

• Transistor type must be NPN
• Maximum collector current (Ic) must be rated at or above 50 A
• Collector-emitter breakdown voltage must meet or exceed 125 V
• Maximum power dissipation must support 300 W operation
• Operating temperature range must accommodate 200°C junction temperature

Mechanical Compatibility Criteria:

• Package type must be TO-3 (TO-204AA)
• Through-hole mounting configuration

The substitute parts 2N6274, 2N6275, and 2N6276 are all manufactured by Microchip Technology and share the NPN transistor type and TO-3 package configuration. However, electrical parameter variations exist that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

2N6274 (Microchip Technology): The 2N6274 is the most completely specified substitute among the available options. It maintains the 50 A collector current rating and TO-3 package configuration. The collector-emitter breakdown voltage is rated at 100 V, which is 25 V lower than the BUT100. The maximum power dissipation is 250 W, compared to 300 W for the BUT100. The operating temperature maximum of 200°C matches the BUT100 specification. This part is currently in active production status with 2211 units in stock. RoHS compliance status differs from the original part.

2N6275 and 2N6276 (Microchip Technology): Complete electrical parameter specifications are not provided for these parts in the available data. Both are manufactured by Microchip Technology, share the TO-3 package configuration, and are classified as active products with inventory availability (919 and 1004 units respectively). Selection of these parts requires access to complete datasheet specifications to verify electrical parameter compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2N6274 directly replace the BUT100 in all applications?

A: The 2N6274 shares the same collector current rating (50 A) and package type (TO-3) as the BUT100. However, the 2N6274 has a lower collector-emitter breakdown voltage (100 V versus 125 V) and lower maximum power dissipation (250 W versus 300 W). Applications operating at voltages above 100 V or requiring the full 300 W power capability require evaluation against the 2N6274 specifications.

Q: What is the significance of the TO-3 package specification?

A: The TO-3 package (also designated TO-204AA) is a through-hole metal can package designed for high-power transistor applications. All substitute parts maintain this package type, ensuring mechanical and thermal compatibility with existing PCB layouts and heat sink mounting configurations.

Q: Why are complete specifications not available for 2N6275 and 2N6276?

A: The provided data contains limited electrical parameter information for these parts. Datasheet consultation is necessary to confirm electrical ratings before selection for specific applications.

Q: How does product status affect part selection?

A: The BUT100 is classified as obsolete, meaning it is no longer manufactured and existing inventory will eventually deplete. The substitute parts 2N6274, 2N6275, and 2N6276 are all active products with current manufacturing and inventory availability, ensuring long-term supply continuity.

Q: What is the impact of RoHS compliance differences?

A: The BUT100 is ROHS3 compliant, while the Microchip substitute parts are RoHS non-compliant. Applications subject to RoHS regulatory requirements must account for this compliance difference in design qualification and procurement processes.