KSC1845PTA Equivalent & Substitute Parts

Part Overview

The KSC1845PTA is an NPN bipolar junction 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 KSC1845PTA is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term system maintenance where this transistor is currently deployed.

Substiute Parts

KSC1845PTA

onsemiIn Stock: 2611KSC1845PTA Datasheet

Current PartRFQ

KSC1845FTA

onsemiIn Stock: 31820KSC1845FTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC1845PTA 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
• Maximum Power Dissipation: 500 mW
• Transition Frequency: 110 MHz
• Operating Temperature Range: 150°C (TJ)

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package Type: TO-92-3 (TO-226-3)

Acceptable Variations:

• DC Current Gain (hFE) may exceed the minimum specification of 200 @ 1 mA, 6 V
• Vce Saturation characteristics may be equivalent or superior
• Collector Cutoff Current (ICBO) may be equal to or lower than 50 nA
• Product Status may differ (Active vs. Obsolete)
• Packaging format (Cut Tape vs. Bulk) does not affect electrical compatibility

Parameter Comparison

*DC Current Gain (hFE) of KSC1845FTA exceeds the minimum specification, representing an acceptable variation.

Engineering Selection Recommendations

The KSC1845FTA is a direct electrical and mechanical equivalent to the KSC1845PTA. Both devices share identical electrical specifications across all critical parameters: collector current, breakdown voltage, saturation characteristics, power dissipation, transition frequency, and operating temperature range. Both are packaged in the TO-92-3 Through Hole configuration.

The primary distinction is product status: the KSC1845PTA is obsolete, while the KSC1845FTA is active. The KSC1845FTA is manufactured by the same supplier (onsemi) and maintains compliance with REACH and EAR99 export classifications.

The KSC1845FTA exhibits a higher minimum DC Current Gain (hFE) of 300 @ 1 mA, 6 V compared to the KSC1845PTA specification of 200 @ 1 mA, 6 V. This represents an improvement in gain characteristics and does not introduce incompatibility in applications designed for the original part.

For new designs or component replenishment, the KSC1845FTA is the appropriate selection due to its active product status and continued availability.

Frequently Asked Questions (FAQ)

Q: Can the KSC1845FTA be used as a direct replacement for the KSC1845PTA in existing designs?

A: Yes. The KSC1845FTA is electrically and mechanically equivalent to the KSC1845PTA. All critical electrical parameters—collector current, breakdown voltage, saturation voltage, power dissipation, transition frequency, and operating temperature—are identical. Both devices use the same TO-92-3 Through Hole package. The higher DC Current Gain of the KSC1845FTA does not create incompatibility.

Q: What is the difference between the KSC1845PTA and KSC1845FTA?

A: The primary difference is product status. The KSC1845PTA is classified as obsolete, while the KSC1845FTA is active. Additionally, the KSC1845FTA specifies a minimum DC Current Gain (hFE) of 300 @ 1 mA, 6 V, compared to 200 @ 1 mA, 6 V for the KSC1845PTA. This represents a specification improvement rather than a limitation.

Q: Are there packaging differences between these parts?

A: Both the KSC1845PTA and KSC1845FTA use the TO-92-3 Through Hole package. The KSC1845FTA is supplied in Cut Tape (CT) packaging format, while the KSC1845PTA was supplied in bulk. This packaging difference does not affect electrical performance or mechanical compatibility in circuit applications.

Q: What compliance certifications apply to the KSC1845FTA?

A: The KSC1845FTA maintains REACH Unaffected status and EAR99 export classification, consistent with the KSC1845PTA. Both devices are RoHS3 compliant where applicable.

Q: Is the KSC1845FTA suitable for new product designs?

A: Yes. The KSC1845FTA is an active product with current manufacturing and distribution support. It is appropriate for new designs requiring an NPN transistor with 50 mA collector current, 120 V breakdown voltage, and 500 mW power dissipation in a Through Hole TO-92-3 package.