2SC24040CL RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The 2SC24040CL is an RF transistor manufactured by Panasonic Electronic Components, classified as an NPN bipolar junction transistor (BJT) designed for RF applications. This component operates at 20V collector-emitter breakdown voltage with a transition frequency of 650MHz and maximum power dissipation of 150mW in a Surface Mount Mini3-G1 package (SOT-23-3).

The 2SC24040CL is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this RF transistor.

Substiute Parts

2SC24040CL

Panasonic Electronic ComponentsIn Stock: 20302SC24040CL Datasheet

Current PartRFQ

BFS17NTA

Diodes IncorporatedIn Stock: 15179BFS17NTA Datasheet

UpgradeRFQ

BFP843H6327XTSA1

Infineon TechnologiesIn Stock: 7041BFP843H6327XTSA1 Datasheet

SimilarRFQ

KSP10BU

Fairchild SemiconductorIn Stock: 124127KSP10BU Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SC24040CL is determined by compatibility across the following critical parameters:

Package Compatibility: The main part uses Surface Mount SOT-23-3 packaging. Substitute parts must maintain the same or compatible package footprint to ensure PCB assembly compatibility.

Transistor Type: All substitutes must be NPN bipolar junction transistors to maintain circuit functionality and biasing requirements.

Voltage Rating: The collector-emitter breakdown voltage must meet or exceed the 20V specification of the original part to ensure safe operation within the intended application voltage range.

Frequency Performance: The transition frequency of 650MHz establishes the RF operating bandwidth. Substitute parts with equal or higher transition frequency maintain or improve RF performance characteristics.

Power Dissipation: The 150mW maximum power rating defines thermal management requirements. Substitute parts must support equivalent or higher power dissipation to prevent thermal stress.

Current Handling: The maximum collector current of 15mA establishes the current capacity requirement. Substitute parts must support this current level or higher.

Gain and Noise Figure: These parameters define signal amplification and noise performance. Substitute parts with comparable or superior specifications maintain circuit performance.

Three substitute parts are identified based on these criteria, each with distinct trade-offs in voltage rating, frequency capability, and packaging format.

Parameter Comparison

Engineering Selection Recommendations

BFS17NTA (Diodes Incorporated): This part is classified as an upgrade substitute. It maintains the SOT-23-3 Surface Mount package format, ensuring direct PCB footprint compatibility. The BFS17NTA is currently in active production status with 15,100 units in stock. It provides superior frequency performance at 3.2GHz compared to the 650MHz specification of the 2SC24040CL, and increased power dissipation capability at 330mW. However, the collector-emitter breakdown voltage is reduced to 11V, which may limit application in circuits requiring the full 20V rating. The part is RoHS3 compliant and REACH unaffected. Operating temperature range extends to −55°C, providing broader environmental compatibility.

BFP843H6327XTSA1 (Infineon Technologies): This part is classified as a similar substitute. It is currently in active production with 6,992 units in stock. The part uses a SOT-343 package, which differs from the SOT-23-3 footprint and requires PCB layout modification. The collector-emitter breakdown voltage of 2.25V is significantly lower than the 20V requirement and restricts application to low-voltage circuits only. Noise figure performance is superior at 0.9–1.85dB across the 450MHz–10GHz range. The part is RoHS3 compliant and REACH unaffected. This substitute is suitable only for applications with low-voltage operating requirements.

KSP10BU (Fairchild Semiconductor): This part is classified as a similar substitute. It maintains the 650MHz transition frequency and 20V collector-emitter breakdown voltage, matching the original part specifications. However, it uses Through Hole TO-92-3 packaging, which is incompatible with Surface Mount PCB designs and requires significant circuit board redesign. The part is currently in active production with 124,035 units in stock, providing excellent availability. Power dissipation capability is increased to 350mW. This substitute is suitable only for applications where through-hole assembly is acceptable or preferred.

Selection of a substitute part depends on application requirements: voltage rating constraints, frequency performance needs, and PCB assembly methodology (surface mount versus through-hole).

Frequently Asked Questions (FAQ)

Q: Can the BFS17NTA directly replace the 2SC24040CL in all applications?

A: The BFS17NTA maintains the SOT-23-3 Surface Mount package and NPN transistor type, enabling direct PCB footprint compatibility. However, the reduced collector-emitter breakdown voltage of 11V versus the original 20V specification restricts its use to applications operating at 11V or below. Circuit voltage requirements must be verified before substitution.

Q: What is the primary limitation of the BFP843H6327XTSA1 as a substitute?

A: The BFP843H6327XTSA1 uses a SOT-343 package instead of the SOT-23-3 package of the original part. This package difference requires PCB layout modification and is not a direct footprint replacement. Additionally, the 2.25V collector-emitter breakdown voltage severely restricts application to low-voltage circuits only.

Q: Why is the KSP10BU listed as a substitute if it uses a different package type?

A: The KSP10BU maintains critical electrical specifications including the 20V collector-emitter breakdown voltage and 650MHz transition frequency. It is identified as a substitute for applications where through-hole assembly is acceptable or where PCB redesign is feasible. It is not suitable for direct replacement in existing Surface Mount designs without significant circuit board modification.

Q: What is the primary advantage of the BFS17NTA over the original 2SC24040CL?

A: The BFS17NTA provides superior frequency performance at 3.2GHz, increased power dissipation at 330mW, and active production status with substantial inventory availability. It also offers an extended operating temperature range of −55°C to 150°C compared to the fixed 150°C maximum of the original part.

Q: Are all substitute parts RoHS compliant?

A: The BFS17NTA and BFP843H6327XTSA1 are both RoHS3 compliant. Compliance status for the KSP10BU is not specified in the provided data.

Q: What packaging considerations apply when selecting a substitute?

A: The 2SC24040CL uses Surface Mount SOT-23-3 packaging. The BFS17NTA maintains this package format and is a direct footprint replacement. The BFP843H6327XTSA1 uses SOT-343 packaging, requiring PCB layout modification. The KSP10BU uses Through Hole TO-92-3 packaging, requiring significant circuit board redesign. Package selection depends on assembly methodology and PCB design constraints.

Q: Can the BFP843H6327XTSA1 be used in high-voltage applications?

A: No. The BFP843H6327XTSA1 has a maximum collector-emitter breakdown voltage of 2.25V, which is insufficient for applications requiring the 20V rating of the original part. This substitute is restricted to low-voltage circuit designs only.

Q: What is the inventory status of each substitute part?

A: BFS17NTA: 15,100 units in stock. BFP843H6327XTSA1: 6,992 units in stock. KSP10BU: 124,035 units in stock. All three substitutes are currently available from inventory.