KSC945CLTA Equivalent & Substitute Parts

Part Overview

The KSC945CLTA is a Bipolar (BJT) NPN transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 50 V collector-emitter breakdown voltage, 150 mA maximum collector current, and 250 mW power dissipation capability in a Through Hole TO-92-3 package. The KSC945CLTA is classified as Obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

KSC945CLTA

onsemiIn Stock: 27714KSC945CLTA Datasheet

Current PartRFQ

KSC945CYTA

onsemiIn Stock: 10500KSC945CYTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC945CLTA is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Transistor Type: NPN
• Current - Collector (Ic) (Max): 150 mA
• Voltage - Collector Emitter Breakdown (Max): 50 V
• Vce Saturation (Max) @ Ib, Ic: 300mV @ 10mA, 100mA
• Current - Collector Cutoff (Max): 100 nA
• Power - Max: 250 mW
• Frequency - Transition: 300 MHz
• Operating Temperature (TJ): 150 °C

Mechanical Parameters (Must Match):

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

Acceptable Variations:

• DC Current Gain (hFE) may vary within manufacturer specifications
• Packaging format (bulk, cut tape, reel) does not affect electrical substitution
• Product status differences (Obsolete vs. Active) do not affect electrical compatibility

Parameter Comparison

Engineering Selection Recommendations

The KSC945CYTA is a direct electrical and mechanical substitute for the KSC945CLTA. Both devices share identical electrical specifications across all critical parameters: collector current, breakdown voltage, saturation voltage, cutoff current, power dissipation, transition frequency, and operating temperature range. Both are packaged in TO-92-3 Through Hole configuration and manufactured by onsemi.

The primary distinction between these parts is product status: the KSC945CLTA is classified as Obsolete, while the KSC945CYTA is Active. For new designs and ongoing procurement, the KSC945CYTA is the appropriate selection. Both parts maintain REACH Unaffected status and EAR99 export classification.

The DC Current Gain (hFE) specification differs between the two parts (350 minimum for KSC945CLTA versus 120 minimum for KSC945CYTA at 1 mA, 6 V). Circuit designs dependent on specific hFE values must account for this variation through appropriate biasing network design.

Frequently Asked Questions (FAQ)

Q: Can the KSC945CYTA directly replace the KSC945CLTA in existing designs?

A: Yes. The KSC945CYTA is electrically and mechanically equivalent to the KSC945CLTA. Both devices meet identical specifications for collector current (150 mA), breakdown voltage (50 V), saturation voltage (300 mV), power dissipation (250 mW), transition frequency (300 MHz), and operating temperature (150 °C). The TO-92-3 package pinout and Through Hole mounting are identical.

Q: What is the significance of the different DC Current Gain (hFE) values?

A: The KSC945CLTA specifies a minimum hFE of 350 at 1 mA and 6 V, while the KSC945CYTA specifies a minimum of 120 at the same conditions. This difference reflects manufacturing variations within the same device family. Circuits designed with proper biasing networks that do not depend on a specific hFE value will function identically with either part. Designs requiring precise current gain should incorporate feedback or current-limiting resistors to ensure stable operation across the hFE range.

Q: Why is the KSC945CLTA classified as Obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production of this specific part number. The KSC945CYTA remains in active production and serves as the current equivalent for new procurement and design support.

Q: Are there packaging format differences between these parts?

A: The KSC945CLTA is supplied in standard packaging format, while the KSC945CYTA is available in Cut Tape (CT) format. Both contain identical die and lead configuration. Packaging format does not affect electrical performance or circuit compatibility; it only influences handling and assembly processes.

Q: Do both parts comply with environmental and export regulations?

A: Yes. Both the KSC945CLTA and KSC945CYTA maintain REACH Unaffected status and are classified under ECCN EAR99, indicating they are not subject to export restrictions. Both parts are suitable for applications requiring regulatory compliance documentation.