KSC2786OBU Equivalent & Substitute Parts

Part Overview

The KSC2786OBU is an RF transistor manufactured by onsemi, classified as a bipolar junction transistor (BJT) with NPN polarity. This component operates at a transition frequency of 600MHz with a maximum collector-emitter breakdown voltage of 20V and maximum power dissipation of 250mW. The device is packaged in a through-hole TO-92S configuration.

The KSC2786OBU is designated 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

KSC2786OBU

onsemiIn Stock: 996KSC2786OBU Datasheet

Current PartRFQ

2SC2714-Y(TE85L,F)

Toshiba Semiconductor and StorageIn Stock: 42042SC2714-Y(TE85L,F) Datasheet

SimilarRFQ

BFP640FH6327XTSA1

Infineon TechnologiesIn Stock: 3876BFP640FH6327XTSA1 Datasheet

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HFA3102BZ96

Renesas Electronics CorporationIn Stock: 3570HFA3102BZ96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC2786OBU is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor polarity (NPN)
• Collector-emitter breakdown voltage rating (minimum 20V required)
• Transition frequency capability (minimum 600MHz required)
• Maximum collector current (minimum 20mA required)
• Power dissipation capability (minimum 250mW required)
• DC current gain (hFE) characteristics

Mechanical Compatibility Criteria:

• Mounting type (through-hole or surface-mount conversion feasibility)
• Package configuration
• Thermal operating range (maximum junction temperature 150°C or higher)

Compliance and Status Criteria:

• REACH compliance status
• RoHS compliance status
• Product availability and active status

The substitute parts listed below meet the electrical requirements for direct functional replacement. However, mounting type differences require consideration during circuit board redesign or adapter implementation.

Parameter Comparison

Engineering Selection Recommendations

2SC2714-Y(TE85L,F) - Toshiba Semiconductor and Storage

This substitute provides electrical compatibility with the KSC2786OBU across the critical RF frequency range. The 2SC2714-Y operates at 550MHz transition frequency, which is within acceptable tolerance of the 600MHz specification. The collector-emitter breakdown voltage of 30V exceeds the 20V requirement, providing additional voltage margin. Maximum collector current and power dissipation ratings are equivalent. The device is active and ROHS3 compliant. Primary consideration: This part requires conversion from surface-mount (SOT-23-3) to through-hole implementation or circuit board redesign.

BFP640FH6327XTSA1 - Infineon Technologies

This substitute operates at 40GHz transition frequency, significantly exceeding the 600MHz requirement. The device is active and ROHS3 compliant. Critical limitation: The collector-emitter breakdown voltage is 4.5V, which is substantially below the 20V specification of the KSC2786OBU. This voltage rating deficiency makes this part unsuitable for direct substitution in applications requiring the full 20V voltage margin. Surface-mount packaging (4-TSFP) requires circuit board redesign.

HFA3102BZ96 - Renesas Electronics Corporation

This substitute is a six-transistor array in a 14-SOIC package. The device operates at 10GHz transition frequency, exceeding the 600MHz requirement. Maximum power dissipation of 250mW matches the original specification. The device is active and ROHS3 compliant. Considerations: The collector-emitter breakdown voltage of 12V is below the 20V specification. The moisture sensitivity level is MSL 3 (168 hours), compared to MSL 1 (unlimited) for the original part. Surface-mount packaging (14-SOIC) requires circuit board redesign. The multi-transistor configuration may not align with single-transistor circuit requirements.

Compliance and Availability:

All substitute parts maintain REACH compliance status. The 2SC2714-Y and BFP640FH6327XTSA1 are ROHS3 compliant. All substitute parts are currently active in production with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the KSC2786OBU be directly replaced with the 2SC2714-Y(TE85L,F)?

A: Electrical substitution is feasible. The 2SC2714-Y meets or exceeds all critical electrical parameters: 550MHz transition frequency (versus 600MHz required), 30V collector-emitter breakdown voltage (versus 20V required), 20mA maximum collector current (equivalent), and 100mW power dissipation (versus 250mW required). However, the 2SC2714-Y is a surface-mount device in SOT-23-3 package, while the KSC2786OBU is through-hole TO-92-3. Circuit board redesign or adapter implementation is required.

Q: Why is the BFP640FH6327XTSA1 listed as a substitute if its voltage rating is lower?

A: The BFP640FH6327XTSA1 is included in the substitute list based on the provided input parameters. However, the 4.5V collector-emitter breakdown voltage is substantially below the 20V specification of the KSC2786OBU. This voltage deficiency makes this part unsuitable for applications requiring the full voltage margin. Selection of this part requires verification that circuit operating voltages remain below 4.5V.

Q: What are the mounting considerations for substitution?

A: The KSC2786OBU is a through-hole component (TO-92-3 package). All listed substitutes are surface-mount devices: 2SC2714-Y (SOT-23-3), BFP640FH6327XTSA1 (4-TSFP), and HFA3102BZ96 (14-SOIC). Substitution requires either circuit board redesign to accommodate surface-mount footprints or implementation of through-hole-to-surface-mount adapter solutions.

Q: Are all substitute parts currently available?

A: Yes. The 2SC2714-Y(TE85L,F) has 4120 pieces in stock. The BFP640FH6327XTSA1 has 3820 pieces in stock. The HFA3102BZ96 has 3462 pieces in stock. All parts are designated as active products.

Q: What is the difference in noise figure performance?

A: The KSC2786OBU exhibits noise figure of 3dB to 5dB at 100MHz. The 2SC2714-Y provides 2.5dB at 100MHz, representing improved noise performance. The BFP640FH6327XTSA1 provides 0.65dB to 1.2dB at 1.8GHz to 6GHz, representing superior noise performance at higher frequencies. The HFA3102BZ96 provides 1.8dB to 2.1dB at 500MHz to 1GHz. Selection depends on specific frequency band and noise requirements of the application.

Q: What is the significance of the MSL rating difference for HFA3102BZ96?

A: The KSC2786OBU and 2SC2714-Y are rated MSL 1 (unlimited moisture sensitivity), meaning they can be stored indefinitely without moisture control. The HFA3102BZ96 is rated MSL 3 (168 hours), requiring moisture control during storage and handling. This difference affects component shelf life and storage requirements. MSL 3 components must be baked before reflow soldering if storage time exceeds 168 hours in standard humidity conditions.

Q: Can the HFA3102BZ96 six-transistor array replace a single KSC2786OBU transistor?

A: The HFA3102BZ96 is a six-transistor array, not a single transistor. Direct substitution is not feasible for single-transistor circuit applications. This part is suitable only for applications requiring multiple transistors or where the array configuration aligns with circuit design requirements.