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KSC945LBU Equivalent & Substitute Parts
Part Overview
The KSC945LBU is an NPN bipolar junction transistor manufactured by onsemi, rated for 50V collector-emitter breakdown voltage and 150mA maximum collector current. This device is classified as obsolete, necessitating identification of active substitute components for new designs and production continuity. The TO-92-3 through-hole package and electrical specifications define the substitution criteria for equivalent devices.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 50 | V |
| Current - Collector (Ic) (Max) | 150 | mA |
| Power - Max | 250 | mW |
| Frequency - Transition | 300 | MHz |
| Mounting Type | Through Hole | — |
| Package / Case | TO-92-3 | — |
| Operating Temperature (Max) | 150 | °C |
Substitute Part Grouping Explanation
Substitution of the KSC945LBU is determined by matching the following critical electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Transistor type must be NPN
- Voltage - Collector Emitter Breakdown rating must equal or exceed 50V
- Current - Collector (Ic) maximum rating must equal or exceed 150mA
- Package / Case must be TO-92-3 or equivalent TO-226-3 through-hole configuration
- Mounting type must be Through Hole
Compliance Considerations:
- Product status (active vs. obsolete)
- REACH and RoHS compliance status
- Moisture Sensitivity Level (MSL)
The 2N6428 PBFREE meets all electrical and mechanical substitution criteria, with enhanced ratings in collector current (200mA) and power dissipation (1.5W), while maintaining the same 50V breakdown voltage and TO-92-3 package configuration.
Parameter Comparison
| Parameter | KSC945LBU | 2N6428 PBFREE | Unit |
|---|---|---|---|
| Manufacturer | onsemi | Central Semiconductor Corp | — |
| Transistor Type | NPN | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 50 | 50 | V |
| Current - Collector (Ic) (Max) | 150 | 200 | mA |
| Power - Max | 250 | 1500 | mW |
| Frequency - Transition | 300 | 100 | MHz |
| Package / Case | TO-92-3 | TO-92-3 | — |
| Mounting Type | Through Hole | Through Hole | — |
| Operating Temperature (Max) | 150 | 150 | °C |
| Product Status | Obsolete | Active | — |
| REACH Status | REACH Unaffected | REACH Unaffected | — |
Engineering Selection Recommendations
The 2N6428 PBFREE is a direct substitute for the KSC945LBU based on matching electrical ratings and package configuration. The substitute device is classified as active product status, ensuring continued availability and supply chain stability compared to the obsolete KSC945LBU.
Both devices maintain identical voltage ratings (50V breakdown) and compatible current handling (2N6428 PBFREE rated at 200mA exceeds the 150mA requirement). The TO-92-3 package configuration is identical, permitting direct board-level replacement without layout modifications.
The 2N6428 PBFREE carries RoHS3 compliance certification, whereas the KSC945LBU compliance status is not specified. Both devices maintain REACH Unaffected status. The substitute device's higher power dissipation rating (1.5W vs. 250mW) provides additional thermal margin in applications operating near maximum current levels.
The KSC945LBU transition frequency of 300MHz exceeds the 2N6428 PBFREE specification of 100MHz. Applications requiring operation above 100MHz must evaluate frequency-dependent performance characteristics before substitution.
Frequently Asked Questions (FAQ)
Q: Can the 2N6428 PBFREE directly replace the KSC945LBU in existing designs?
A: Yes. Both devices share identical voltage ratings (50V), compatible current ratings (2N6428 PBFREE at 200mA exceeds the 150mA requirement), and identical TO-92-3 package configuration. Direct board-level substitution is mechanically and electrically compatible.
Q: What are the key differences between these devices?
A: The primary differences are product status (KSC945LBU is obsolete; 2N6428 PBFREE is active), transition frequency (KSC945LBU at 300MHz; 2N6428 PBFREE at 100MHz), and power dissipation rating (KSC945LBU at 250mW; 2N6428 PBFREE at 1.5W). Applications operating above 100MHz must evaluate frequency performance.
Q: Are there package compatibility concerns?
A: No. Both devices use the TO-92-3 through-hole package configuration. Pin assignments and mechanical dimensions are compatible for direct substitution.
Q: What compliance certifications apply to the substitute part?
A: The 2N6428 PBFREE carries RoHS3 compliance and REACH Unaffected status. The KSC945LBU is REACH Unaffected; RoHS status is not specified in available documentation.
Q: Does the higher power rating of the 2N6428 PBFREE affect circuit operation?
A: No. Higher power dissipation ratings provide additional thermal margin and do not alter circuit behavior. The device operates within the same voltage and current parameters as the KSC945LBU.
Q: What is the Moisture Sensitivity Level (MSL) for the substitute part?
A: The 2N6428 PBFREE carries MSL Not Applicable status, indicating no moisture sensitivity restrictions. The KSC945LBU is rated MSL 1 (Unlimited).
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