KSC945OBU Equivalent & Substitute Parts

Part Overview

The KSC945OBU is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 50V collector-emitter breakdown voltage rating and supports collector currents up to 150mA with a maximum power dissipation of 250mW in a Through Hole TO-92-3 package.

The KSC945OBU is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Substiute Parts

KSC945OBU

onsemiIn Stock: 1020KSC945OBU Datasheet

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2N6428 PBFREE

Central Semiconductor CorpIn Stock: 9712N6428 PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC945OBU is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor type must be NPN
• Collector-emitter breakdown voltage must equal or exceed 50V
• Maximum collector current must equal or exceed 150mA
• Maximum power dissipation must equal or exceed 250mW
• Operating temperature range must support 150°C maximum junction temperature

Mechanical Compatibility Criteria:

• Mounting type must be Through Hole
• Package must be TO-92-3 or equivalent TO-226-3 variant

The 2N6428 PBFREE meets these substitution criteria with electrical ratings that exceed the KSC945OBU specifications while maintaining identical package and mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 2N6428 PBFREE is a direct substitute for the KSC945OBU based on the following engineering factors:

Electrical Compatibility: The 2N6428 PBFREE exceeds all critical electrical specifications of the KSC945OBU. Maximum collector current is rated at 200mA compared to 150mA, and maximum power dissipation is 1500mW compared to 250mW. Both devices share identical 50V collector-emitter breakdown voltage ratings and support the same maximum operating temperature of 150°C.

Package and Mounting: Both devices utilize the TO-92-3 Through Hole package, ensuring mechanical compatibility with existing PCB layouts and assembly processes without modification.

Product Status and Compliance: The 2N6428 PBFREE maintains Active product status, ensuring ongoing availability and supply chain support. The device is ROHS3 Compliant and carries REACH Unaffected status, meeting current regulatory requirements. The KSC945OBU, classified as Obsolete, lacks these compliance certifications.

Frequency Consideration: The KSC945OBU operates at 300MHz transition frequency, while the 2N6428 PBFREE operates at 100MHz. Applications requiring frequencies above 100MHz must evaluate circuit performance independently.

Frequently Asked Questions (FAQ)

Q: Can the 2N6428 PBFREE directly replace the KSC945OBU in all applications?

A: The 2N6428 PBFREE meets all electrical and mechanical substitution criteria for the KSC945OBU. However, applications operating at frequencies above 100MHz must evaluate performance, as the 2N6428 PBFREE has a transition frequency of 100MHz compared to the KSC945OBU's 300MHz specification.

Q: Are there package compatibility concerns when substituting these parts?

A: No. Both the KSC945OBU and 2N6428 PBFREE use the TO-92-3 Through Hole package. Pin configuration and mechanical dimensions are compatible, requiring no PCB layout modifications.

Q: What is the significance of the 2N6428 PBFREE being ROHS3 Compliant while the KSC945OBU is not?

A: ROHS3 Compliance indicates the 2N6428 PBFREE meets current environmental and material restriction standards for electronic components. This certification is required for many modern applications and supply chains. The KSC945OBU's Obsolete status and lack of compliance certification make it unsuitable for new designs or regulated applications.

Q: Does the higher power rating of the 2N6428 PBFREE affect circuit design?

A: The 2N6428 PBFREE's 1500mW power rating exceeds the KSC945OBU's 250mW rating. This provides additional thermal margin in applications but does not require circuit redesign. Existing thermal management and current-limiting designs remain valid.

Q: What inventory status should be considered when selecting between these parts?

A: The KSC945OBU has 956 pieces in stock, while the 2N6428 PBFREE has 916 pieces in stock. Both devices show adequate inventory availability. However, the KSC945OBU's Obsolete status indicates no future production, making the Active-status 2N6428 PBFREE the preferred long-term choice.