KSC1845FBU Equivalent & Substitute Parts

Part Overview

The KSC1845FBU 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 KSC1845FBU is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this transistor.

Substiute Parts

KSC1845FBU

onsemiIn Stock: 997KSC1845FBU Datasheet

Current PartRFQ

KSC1845FTA

onsemiIn Stock: 31820KSC1845FTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC1845FBU is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Transistor Type: NPN
• Maximum Collector Current (Ic): 50 mA
• Collector-Emitter Breakdown Voltage: 120 V
• Vce Saturation: 300mV @ 1mA, 10mA
• Collector Cutoff Current (ICBO): 50 nA
• DC Current Gain (hFE): 300 minimum @ 1mA, 6V
• Maximum Power Dissipation: 500 mW
• Transition Frequency: 110 MHz
• Maximum Operating Temperature: 150°C

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package Type: TO-92-3

The KSC1845FTA meets all electrical and mechanical requirements for direct substitution with the KSC1845FBU. Both devices share identical electrical specifications and package configuration, differing only in packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The KSC1845FTA is a direct electrical and mechanical equivalent to the KSC1845FBU. Selection between these parts is determined by product availability and supply chain requirements rather than technical performance.

KSC1845FBU Selection Criteria:

• Product Status: Obsolete
• Suitable for applications where existing inventory must be utilized or where design documentation specifically references this part number

KSC1845FTA Selection Criteria:

• Product Status: Active
• Recommended for new designs and ongoing production
• Higher inventory availability (31,783 pcs vs. 982 pcs)
• RoHS3 Compliant certification
• Cut Tape packaging format suitable for automated assembly processes

Both parts carry REACH Unaffected status and EAR99 ECCN classification. The KSC1845FTA provides superior supply chain continuity due to active product status and higher stock levels.

Frequently Asked Questions (FAQ)

Q: Can the KSC1845FTA directly replace the KSC1845FBU in existing designs?

A: Yes. The KSC1845FTA is electrically and mechanically equivalent to the KSC1845FBU. All electrical parameters, including collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, and transition frequency are identical. Both devices use the TO-92-3 Through Hole package with identical pinout and mechanical dimensions.

Q: What is the difference between KSC1845FBU and KSC1845FTA?

A: The primary differences are product status and packaging format. The KSC1845FBU is obsolete and supplied in bulk packaging, while the KSC1845FTA is an active product supplied in Cut Tape (CT) format. The KSC1845FTA also carries RoHS3 Compliant certification. Electrical specifications are identical.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are REACH Unaffected and carry EAR99 ECCN classification. The KSC1845FTA includes RoHS3 Compliant certification. Both parts have Moisture Sensitivity Level (MSL) ratings appropriate for their respective packaging formats.

Q: Which part should be selected for new production?

A: The KSC1845FTA is recommended for new production due to active product status, higher inventory availability, and RoHS3 compliance. The KSC1845FBU should be reserved for applications where existing inventory must be consumed or where design documentation specifically requires this part number.

Q: Is the TO-92-3 package compatible between both parts?

A: Yes. Both the KSC1845FBU and KSC1845FTA use the TO-92-3 (TO-226AA) Through Hole package. Mechanical dimensions, pinout, and mounting requirements are identical, ensuring direct board-level compatibility.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching the following parameters: NPN transistor type, 50 mA maximum collector current, 120 V collector-emitter breakdown voltage, 300 mV saturation voltage at specified bias conditions, 50 nA collector cutoff current, 300 minimum DC current gain, 500 mW maximum power dissipation, 110 MHz transition frequency, and 150°C maximum operating temperature.