KSC2786YTA Equivalent & Substitute Parts

Part Overview

The KSC2786YTA is an RF transistor manufactured by onsemi, classified as an NPN bipolar junction transistor (BJT) designed for radio frequency applications. This device operates at a transition frequency of 600MHz with a maximum collector-emitter breakdown voltage of 20V and maximum power dissipation of 250mW. The part is packaged in a Through Hole TO-92S configuration.

The KSC2786YTA is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

KSC2786YTA

onsemiIn Stock: 1141KSC2786YTA Datasheet

Current PartRFQ

BFP193WH6327XTSA1

Infineon TechnologiesIn Stock: 54119BFP193WH6327XTSA1 Datasheet

SimilarRFQ

BFP620FH7764XTSA1

Infineon TechnologiesIn Stock: 5428BFP620FH7764XTSA1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC2786YTA requires evaluation based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor Type: NPN configuration must be maintained
• Voltage Rating: Collector-emitter breakdown voltage must meet or exceed 20V
• Frequency Performance: Transition frequency must support the 600MHz operating range
• Current Capability: Maximum collector current must accommodate 20mA operation
• Power Dissipation: Maximum power rating must support 250mW operation
• Gain Characteristics: DC current gain (hFE) must align with circuit requirements
• Noise Performance: Noise figure specifications must be compatible with RF application requirements

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole configuration is preferred for direct replacement
• Package Type: TO-92-3 Short Body footprint compatibility

The substitute parts identified (BFP193WH6327XTSA1 and BFP620FH7764XTSA1) are surface mount devices that exceed the electrical specifications of the KSC2786YTA. These parts represent functional alternatives for new designs or redesigned applications where surface mount technology is acceptable. Direct pin-for-pin replacement in existing through-hole PCB layouts is not possible due to package differences.

Parameter Comparison

Engineering Selection Recommendations

Product Status Considerations:

The KSC2786YTA is obsolete, while both substitute parts (BFP193WH6327XTSA1 and BFP620FH7764XTSA1) maintain active product status with Infineon Technologies. Active product status ensures ongoing availability, technical support, and compliance with current regulatory standards.

Compliance and Certification:

Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The main part (KSC2786YTA) does not specify RoHS compliance status. Both substitutes carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications as the main part, ensuring consistent export and tariff treatment.

Electrical Performance:

BFP193WH6327XTSA1 operates at a lower maximum collector-emitter breakdown voltage (12V versus 20V) but provides significantly higher transition frequency (8GHz versus 600MHz) and superior noise performance (1dB ~ 1.6dB versus 3dB ~ 5dB). This part is suitable for applications requiring higher frequency operation within lower voltage constraints.

BFP620FH7764XTSA1 operates at the lowest maximum collector-emitter breakdown voltage (2.8V) but provides the highest transition frequency (65GHz) and lowest noise figure (0.7dB ~ 1.3dB). This part is designed for ultra-high-frequency applications and is not suitable for circuits requiring 20V operation.

Packaging and Integration:

Both substitute parts are surface mount devices, requiring PCB redesign for integration into existing through-hole layouts. The choice between SOT-343 (BFP193WH6327XTSA1) and 4-TSFP (BFP620FH7764XTSA1) packaging depends on specific board layout and assembly capabilities.

Frequently Asked Questions (FAQ)

Q: Can BFP193WH6327XTSA1 or BFP620FH7764XTSA1 be used as direct replacements for KSC2786YTA in existing PCB designs?

A: No. The KSC2786YTA uses Through Hole TO-92-3 packaging, while both substitute parts use surface mount packages (SOT-343 and 4-TSFP respectively). Direct pin-for-pin replacement is not possible without PCB redesign and assembly process changes.

Q: Which substitute part is more suitable for a 20V application?

A: Neither substitute part is rated for 20V collector-emitter breakdown voltage. BFP193WH6327XTSA1 is rated to 12V maximum, and BFP620FH7764XTSA1 is rated to 2.8V maximum. Applications requiring 20V operation cannot use these substitutes without circuit redesign to reduce operating voltage.

Q: What are the key differences in frequency performance between these parts?

A: The KSC2786YTA operates at 600MHz transition frequency. BFP193WH6327XTSA1 provides 8GHz capability, and BFP620FH7764XTSA1 provides 65GHz capability. Selection depends on the actual frequency requirements of the application, not merely the availability of higher frequency parts.

Q: Are there any moisture sensitivity concerns with these substitute parts?

A: All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations. Standard handling and storage procedures apply to all parts.

Q: How do the noise figure specifications compare?

A: The KSC2786YTA specifies 3dB ~ 5dB noise figure at 100MHz. BFP193WH6327XTSA1 specifies 1dB ~ 1.6dB at 900MHz ~ 1.8GHz, and BFP620FH7764XTSA1 specifies 0.7dB ~ 1.3dB at 1.8GHz ~ 6GHz. Lower noise figures indicate superior performance, but measurements are taken at different frequency points, requiring application-specific evaluation.

Q: What is the maximum collector current capability of each part?

A: KSC2786YTA is rated for 20mA maximum collector current. BFP193WH6327XTSA1 and BFP620FH7764XTSA1 are both rated for 80mA maximum collector current, providing significantly higher current handling capability.

Q: Are compliance certifications equivalent across all three parts?

A: Both substitute parts are ROHS3 compliant and REACH unaffected. The main part does not specify RoHS compliance. All three parts share identical ECCN and HTSUS classifications. For new designs, the ROHS3 compliance of substitute parts aligns with current regulatory requirements.