BUT11TU Equivalent & Substitute Parts

Part Overview

The BUT11TU is an NPN bipolar junction transistor manufactured by onsemi, rated for 400 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 100 W power rating and high voltage capability position this transistor for switching and amplification applications in industrial and consumer power electronics.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V
Current - Collector (Ic) (Max)	5 A
Power - Max	100 W
Vce Saturation (Max)	1.5 V @ 600 mA, 3 A
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the BUT11TU is determined by the following critical parameters:

Primary Matching Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 400 V or higher
Current - Collector (Ic) (Max): 5 A or higher
Mounting Type: Through Hole
Package / Case: TO-220-3 or compatible TO-220 variants
Operating Temperature: 150°C (TJ)

Secondary Considerations:

Power - Max: 70 W or higher (acceptable for applications within BUT11TU power envelope)
Vce Saturation characteristics
Current - Collector Cutoff (Max)
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Full Parameter Match (400 V, 5 A): Parts meeting or exceeding the original 400 V and 5 A specifications with 100 W or comparable power ratings.

Category B - Reduced Current or Power (400-450 V, 4-5 A): Parts with slightly reduced current or power ratings but maintaining voltage compatibility and through-hole TO-220 packaging.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Vce Sat (Max)	Package	Status
BUT11TU	onsemi	5 A	400 V	100 W	1.5 V @ 600 mA, 3 A	TO-220-3	Obsolete
BUJ303B,127	WeEn Semiconductors	5 A	400 V	100 W	1.5 V @ 1 A, 3 A	TO-220-3	Active
BUL38D	STMicroelectronics	5 A	450 V	80 W	1.1 V @ 750 mA, 3 A	TO-220-3	Active
BUL49D	STMicroelectronics	5 A	450 V	80 W	1.2 V @ 800 mA, 4 A	TO-220-3	Active
BUL742C	STMicroelectronics	4 A	400 V	70 W	1.5 V @ 1 A, 3.5 A	TO-220-3	Active
ST13005	STMicroelectronics	4 A	400 V	75 W	1 V @ 1 A, 4 A	TO-220-3	Active
TSC742CZ C0G	Taiwan Semiconductor Corporation	5 A	420 V	70 W	1.5 V @ 1 A, 3.5 A	TO-220-3	Active

Engineering Selection Recommendations

Category A - Direct Substitutes (Recommended for Primary Selection):

BUJ303B,127 (WeEn Semiconductors) provides the closest electrical equivalence to BUT11TU with identical 5 A collector current, 400 V breakdown voltage, and 100 W power rating. This part is in active production status with RoHS compliance, ensuring long-term availability and regulatory alignment. The TO-220AB packaging is mechanically compatible with TO-220-3 footprints.

TSC742CZ C0G (Taiwan Semiconductor Corporation) matches the 5 A and 400 V specifications with 420 V breakdown voltage margin. Active production status and RoHS3 compliance support supply chain continuity. The 70 W power rating is reduced from the original 100 W but remains suitable for applications within the 70 W thermal envelope.

Category B - Voltage-Compatible Alternatives (For Reduced Current Applications):

BUL38D and BUL49D (STMicroelectronics) both provide 5 A collector current with elevated 450 V breakdown voltage ratings, offering additional voltage margin. Both are in active production with RoHS3 compliance. The 80 W power rating represents a 20% reduction from BUT11TU specifications and is suitable for applications not requiring the full 100 W dissipation.

BUL742C and ST13005 (STMicroelectronics) are rated for 4 A maximum collector current with 400 V breakdown voltage. These parts are appropriate for applications where collector current does not exceed 4 A. Both maintain active production status and RoHS3 compliance. Power ratings of 70 W and 75 W respectively are reduced from the original specification.

Compliance and Availability:

All substitute parts listed are in active production status, ensuring availability for new designs and production runs. STMicroelectronics parts carry RoHS3 compliance; WeEn Semiconductors and Taiwan Semiconductor Corporation parts carry RoHS compliance. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can BUJ303B,127 directly replace BUT11TU in existing designs?

A: Yes. BUJ303B,127 matches the critical electrical parameters: 5 A collector current, 400 V breakdown voltage, 100 W power rating, and TO-220-3 package. The TO-220AB supplier package designation indicates mechanical compatibility with standard TO-220-3 footprints. No circuit modifications are required.

Q: What is the difference between TO-220-3 and TO-220AB packaging?

A: Both designations refer to the same three-lead through-hole package format with identical pin spacing and mounting hole locations. TO-220AB is a supplier-specific package designation used by WeEn Semiconductors for the same physical package. Mechanical and electrical compatibility is maintained.

Q: Are the STMicroelectronics alternatives (BUL38D, BUL49D) suitable replacements?

A: BUL38D and BUL49D are suitable for applications where the full 5 A collector current and 100 W power dissipation are not simultaneously required. Both parts provide 5 A current capability and elevated 450 V breakdown voltage. The 80 W power rating is a 20% reduction; verify that thermal design accommodates this lower dissipation limit. Both are in active production with RoHS3 compliance.

Q: Why do BUL742C and ST13005 have reduced collector current ratings?

A: BUL742C and ST13005 are rated for 4 A maximum collector current compared to BUT11TU's 5 A specification. These parts are suitable only for applications where peak collector current does not exceed 4 A. Verify circuit current requirements before selection. Both parts maintain 400 V breakdown voltage and active production status.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates ongoing production and long-term availability from the manufacturer. Obsolete status (BUT11TU) indicates discontinued production, making equivalent parts necessary for design continuity. All listed substitute parts carry active status, ensuring supply chain reliability for new designs and production quantities.

Q: Are there thermal or mounting considerations when substituting these parts?

A: All substitute parts use identical TO-220-3 through-hole mounting, requiring no PCB redesign. Thermal performance varies with power rating: 100 W (BUJ303B,127), 80 W (BUL38D, BUL49D), 70 W (BUL742C, TSC742CZ), and 75 W (ST13005). Verify that heatsink thermal resistance accommodates the selected part's power dissipation in the target application.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All listed substitute parts carry either RoHS or RoHS3 compliance certification. BUJ303B,127 is RoHS compliant. BUL38D, BUL49D, BUL742C, ST13005, and TSC742CZ are RoHS3 compliant. All parts are REACH unaffected. Compliance documentation is available from respective manufacturers.

Q: What is the difference in Vce saturation between substitute parts?

A: Vce saturation varies across substitutes: BUT11TU (1.5 V @ 600 mA, 3 A), BUJ303B,127 (1.5 V @ 1 A, 3 A), BUL38D (1.1 V @ 750 mA, 3 A), BUL49D (1.2 V @ 800 mA, 4 A), BUL742C (1.5 V @ 1 A, 3.5 A), ST13005 (1 V @ 1 A, 4 A), and TSC742CZ (1.5 V @ 1 A, 3.5 A). Lower Vce saturation reduces power dissipation in saturated switching applications. Verify saturation voltage requirements for your specific circuit topology.

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