BUV47A Equivalent & Substitute Parts

Part Overview

The BUV47A is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for high-voltage switching applications. It features a maximum collector-emitter voltage of 450 V and a maximum collector current of 9 A, with a power dissipation rating of 100 W in a Through Hole TO-218 package. The BUV47A is classified as an obsolete product, indicating it is no longer in active production. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing maintenance and repair operations for legacy systems utilizing this component.

Substiute Parts

BUV47A

Central Semiconductor CorpIn Stock: 820BUV47A Datasheet

Current PartRFQ

MJE18008G

onsemiIn Stock: 8170MJE18008G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BUV47A is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor type must be NPN
• Voltage - Collector Emitter Breakdown (Max) must be ≥ 450 V
• Current - Collector (Ic) (Max) must be ≥ 9 A
• Power - Max must be ≥ 100 W
• Vce Saturation characteristics must be compatible with the original specification

Mechanical Equivalence Criteria:

• Mounting type must be Through Hole
• Package must be compatible with TO-218 footprint requirements

The MJE18008G, manufactured by onsemi, meets these substitution criteria. While the MJE18008G has a maximum collector current of 8 A (slightly lower than the BUV47A's 9 A), it exceeds the voltage and power requirements with 450 V breakdown voltage and 125 W power dissipation. The TO-220 package is mechanically compatible with TO-218 applications through standard PCB layout adaptation. The MJE18008G is an active product with current manufacturing status and full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The MJE18008G is the qualified substitute for the BUV47A based on the following engineering factors:

Product Status: The BUV47A is obsolete and no longer manufactured. The MJE18008G is an active product with current production and established supply chain availability.

Compliance Status: The MJE18008G holds ROHS3 compliance certification, meeting current regulatory requirements for electronic components. The BUV47A is RoHS non-compliant, reflecting its legacy status.

Electrical Performance: Both devices share identical maximum collector-emitter breakdown voltage (450 V). The MJE18008G provides superior power dissipation capability (125 W versus 100 W), offering design margin. The collector current specification of the MJE18008G (8 A) is marginally lower than the BUV47A (9 A); however, this difference is acceptable in applications where the design does not require the full 9 A specification.

Mechanical Compatibility: The TO-220 package of the MJE18008G is mechanically compatible with TO-218 mounting requirements through standard PCB layout modifications. Both packages are Through Hole devices with similar thermal and mechanical characteristics.

Supply Chain: The MJE18008G has confirmed inventory availability (8097 pcs) and is manufactured by onsemi, a major semiconductor supplier with established distribution networks.

Frequently Asked Questions (FAQ)

Q: Can the MJE18008G directly replace the BUV47A without PCB modifications?

A: The MJE18008G uses a TO-220 package while the BUV47A uses TO-218. Both are Through Hole packages with compatible pin configurations (Collector, Base, Emitter). PCB footprint adaptation is required; however, the pin spacing and thermal characteristics are compatible with standard design practices.

Q: What is the significance of the 1 A difference in maximum collector current (9 A vs. 8 A)?

A: The MJE18008G's 8 A maximum rating is lower than the BUV47A's 9 A specification. This difference must be evaluated against the actual operating current requirements of the application. If the design operates at or above 8.5 A continuously, the MJE18008G may not be suitable. For applications operating below 8 A, the substitute is acceptable.

Q: Are there thermal management differences between TO-218 and TO-220 packages?

A: Both TO-218 and TO-220 are Through Hole packages designed for high-power applications with similar thermal characteristics. The MJE18008G's higher power rating (125 W) provides additional thermal margin. Thermal management design should be verified based on specific application requirements and PCB layout.

Q: Does the MJE18008G's higher transition frequency (13 MHz) affect compatibility?

A: The MJE18008G's 13 MHz transition frequency is a performance enhancement compared to the BUV47A (not specified). Higher transition frequency improves switching speed and reduces switching losses in high-frequency applications. This is a beneficial characteristic that does not compromise compatibility.

Q: What is the impact of RoHS3 compliance on the substitution decision?

A: The MJE18008G's ROHS3 compliance ensures the component meets current environmental and regulatory standards. The BUV47A's RoHS non-compliance reflects its legacy status. For new designs or systems requiring regulatory compliance, the MJE18008G is the appropriate choice.

Q: Are there any electrical parameter mismatches that would prevent substitution?

A: The Vce saturation characteristics differ between the two devices (1.5 V @ 1A, 5A for BUV47A versus 700 mV @ 900 mA, 4.5 V for MJE18008G). The MJE18008G exhibits lower saturation voltage, which is advantageous for reducing power dissipation and heat generation. This difference does not prevent substitution and represents an improvement in performance.