KSC1845EBU Equivalent & Substitute Parts

Part Overview

The KSC1845EBU is a Bipolar (BJT) NPN transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 50 mA, collector-emitter breakdown voltage of 120 V, and maximum power dissipation of 500 mW in a Through Hole TO-92-3 package. The KSC1845EBU is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for legacy systems utilizing this transistor.

Substiute Parts

KSC1845EBU

onsemiIn Stock: 844KSC1845EBU Datasheet

Current PartRFQ

KSC1845FTA

onsemiIn Stock: 31820KSC1845FTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC1845EBU is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Transistor Type: NPN
• Maximum Collector Current (Ic): 50 mA
• Maximum Collector-Emitter Breakdown Voltage: 120 V
• Maximum Power Dissipation: 500 mW
• Transition Frequency: 110 MHz
• Maximum Operating Temperature: 150°C
• Package Type: TO-92-3 Through Hole
• Vce Saturation: 300mV @ 1mA, 10mA
• Collector Cutoff Current: 50 nA

The KSC1845FTA meets all critical electrical specifications and maintains identical package configuration. Substitution is valid based on parameter equivalence across voltage, current, power, and frequency ratings. Packaging format differences (Cut Tape versus bulk) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

KSC1845FTA as Primary Substitute:

The KSC1845FTA is the direct equivalent substitute for the KSC1845EBU. Both devices share identical electrical ratings across all critical parameters: collector current, breakdown voltage, power dissipation, transition frequency, and operating temperature range. The package configuration is identical (TO-92-3 Through Hole), ensuring mechanical and pin compatibility.

The KSC1845FTA holds Active product status, whereas the KSC1845EBU is classified as Obsolete. This status difference makes the KSC1845FTA the preferred selection for new designs and ongoing production support. The KSC1845FTA is RoHS3 Compliant, meeting current environmental and regulatory requirements.

The DC Current Gain (hFE) specification shows a minimum of 300 @ 1mA, 6V for the KSC1845FTA compared to 400 @ 1mA, 6V for the KSC1845EBU. This represents a lower bound specification for the substitute part. Both devices remain within acceptable operating parameters for general-purpose NPN switching and amplification applications where the specified gain characteristics are sufficient.

Both parts carry REACH Unaffected status and EAR99 ECCN classification, confirming equivalent regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the KSC1845FTA directly replace the KSC1845EBU in existing designs?

A: Yes. The KSC1845FTA is electrically and mechanically equivalent to the KSC1845EBU. All critical electrical parameters—collector current, breakdown voltage, power dissipation, transition frequency, and operating temperature—are identical. The TO-92-3 package configuration ensures pin-for-pin compatibility without circuit board modifications.

Q: What is the difference between the KSC1845EBU and KSC1845FTA?

A: The primary differences are product status and packaging format. The KSC1845EBU is classified as Obsolete, while the KSC1845FTA is Active. The KSC1845EBU is supplied in standard packaging, whereas the KSC1845FTA is supplied in Cut Tape (CT) format. Electrically, both devices are equivalent. The KSC1845FTA includes RoHS3 Compliance certification.

Q: Does the DC Current Gain difference affect substitution?

A: The KSC1845FTA specifies a minimum DC Current Gain (hFE) of 300 @ 1mA, 6V, compared to 400 @ 1mA, 6V for the KSC1845EBU. This represents a lower bound specification for the substitute part. For applications where the specified gain characteristics of the KSC1845EBU are required, circuit performance must be evaluated. In general-purpose switching and amplification applications, the KSC1845FTA gain specification is sufficient.

Q: Are there any compliance or regulatory differences?

A: Both the KSC1845EBU and KSC1845FTA carry REACH Unaffected status and EAR99 ECCN classification. The KSC1845FTA includes RoHS3 Compliance certification, meeting current environmental standards. Both devices have Moisture Sensitivity Level (MSL) ratings appropriate for handling and storage.

Q: What is the significance of the TO-92-3 package?

A: The TO-92-3 package is a standard Through Hole configuration with three leads (Base, Collector, Emitter). This package type ensures compatibility with existing printed circuit board designs without requiring layout modifications. Both the KSC1845EBU and KSC1845FTA utilize identical TO-92-3 (TO-226AA) package specifications.

Q: Why is the KSC1845EBU classified as Obsolete?

A: Obsolete product status indicates that the manufacturer has discontinued production and support for this part number. The KSC1845FTA, classified as Active, represents the current production equivalent and is the recommended selection for new designs and ongoing production requirements.