BF199_J35Z Equivalent & Substitute Parts

Part Overview

The BF199_J35Z is an RF transistor NPN manufactured by onsemi, rated for 25V collector-emitter breakdown voltage with a transition frequency of 1.1GHz and maximum power dissipation of 350mW. This device is packaged in a through-hole TO-92-3 configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance applications.

Substiute Parts

BF199_J35Z

onsemiIn Stock: 1101BF199_J35Z Datasheet

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2N918 PBFREE

Central Semiconductor CorpIn Stock: 18392N918 PBFREE Datasheet

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BFP405H6327XTSA1

Infineon TechnologiesIn Stock: 40407BFP405H6327XTSA1 Datasheet

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MT3S16U(TE85L,F)

Toshiba Semiconductor and StorageIn Stock: 4003MT3S16U(TE85L,F) Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BF199_J35Z is determined by the following critical parameters: transistor type (NPN), voltage rating, frequency capability, power dissipation, collector current rating, and mounting configuration. The substitute parts listed have been identified based on compatibility within these electrical and mechanical constraints.

The substitution logic is organized into two categories:

Category 1: Through-Hole Mounted Substitutes Parts maintaining through-hole mounting technology with comparable or superior electrical ratings.

Category 2: Surface-Mount Alternatives Parts utilizing surface-mount technology with enhanced frequency and power characteristics, suitable for redesigned applications.

The following parameters determine substitution eligibility:

• Transistor Type: NPN (required)
• Voltage Rating: Equal to or greater than 25V (for through-hole category) or 5V minimum (for surface-mount category)
• Frequency: Equal to or greater than 1.1GHz
• Power Dissipation: Equal to or greater than 350mW (for through-hole category)
• Collector Current: Equal to or greater than 50mA
• Product Status: Active or Obsolete (both acceptable for substitution purposes)

Parameter Comparison

Engineering Selection Recommendations

2N918 PBFREE (Central Semiconductor Corp)

The 2N918 PBFREE is an active product with through-hole TO-72 packaging, maintaining the same mounting technology as the BF199_J35Z. This part is suitable for direct replacement in existing through-hole PCB designs. The 2N918 PBFREE carries RoHS3 compliance and is lead-free, meeting modern environmental standards. However, the voltage rating of 15V is lower than the original 25V specification, and the transition frequency of 600MHz is below the 1.1GHz requirement. This part is applicable only in applications where voltage and frequency requirements can be relaxed.

BFP405H6327XTSA1 (Infineon Technologies)

The BFP405H6327XTSA1 is an active surface-mount RF transistor with a transition frequency of 25GHz, significantly exceeding the 1.1GHz specification of the BF199_J35Z. This part is RoHS3 compliant and carries a noise figure specification of 1.25dB @ 1.8GHz with a gain of 23dB. The surface-mount SOT-343 package requires PCB redesign. The collector current maximum of 25mA is lower than the 50mA rating of the original part, and the voltage rating of 5V is substantially reduced. This part is suitable for high-frequency applications requiring redesigned surface-mount implementations.

MT3S16U(TE85L,F) (Toshiba Semiconductor and Storage)

The MT3S16U(TE85L,F) is an active surface-mount RF transistor with a transition frequency of 4GHz, exceeding the 1.1GHz requirement. This part is RoHS compliant and provides a noise figure of 2.4dB @ 1GHz with a gain of 4.5dBi. The surface-mount SC-70 package requires PCB redesign. The collector current maximum of 60mA exceeds the 50mA rating of the original part. The voltage rating of 5V is substantially reduced compared to the 25V specification. This part is suitable for applications requiring higher frequency performance with surface-mount technology.

Frequently Asked Questions (FAQ)

Q: Can the 2N918 PBFREE be used as a direct replacement for the BF199_J35Z in existing designs?

A: The 2N918 PBFREE maintains through-hole mounting compatibility with the BF199_J35Z, allowing physical installation in existing PCB layouts. However, the reduced voltage rating of 15V versus 25V and lower transition frequency of 600MHz versus 1.1GHz require circuit evaluation to confirm functional compatibility with the original design specifications.

Q: What are the primary differences between through-hole and surface-mount substitute options?

A: Through-hole substitutes (2N918 PBFREE) maintain the same mounting technology as the BF199_J35Z and can be installed in existing PCB designs without layout modifications. Surface-mount substitutes (BFP405H6327XTSA1, MT3S16U(TE85L,F)) require PCB redesign and new assembly processes but offer enhanced frequency performance and reduced package size.

Q: Are the surface-mount alternatives suitable for high-frequency applications?

A: Yes. The BFP405H6327XTSA1 provides a transition frequency of 25GHz, and the MT3S16U(TE85L,F) provides 4GHz, both substantially exceeding the 1.1GHz specification of the BF199_J35Z. These parts are applicable in applications requiring higher frequency operation.

Q: What compliance certifications apply to the substitute parts?

A: The 2N918 PBFREE carries RoHS3 compliance and is lead-free. The BFP405H6327XTSA1 carries RoHS3 compliance. The MT3S16U(TE85L,F) carries RoHS compliance. All substitute parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the impact of reduced voltage ratings on substitute part selection?

A: The 2N918 PBFREE (15V), BFP405H6327XTSA1 (5V), and MT3S16U(TE85L,F) (5V) all have lower voltage ratings than the original BF199_J35Z (25V). Circuit designs operating at voltages exceeding the substitute part ratings require alternative selection or circuit modification to reduce operating voltage.

Q: How do collector current ratings affect substitution decisions?

A: The BF199_J35Z is rated for 50mA maximum collector current. The 2N918 PBFREE matches this rating at 50mA. The BFP405H6327XTSA1 is rated for 25mA, which is lower and may limit current-handling capability. The MT3S16U(TE85L,F) is rated for 60mA, which exceeds the original specification and provides additional current capacity.

Q: What packaging considerations apply when selecting a substitute part?

A: The BF199_J35Z uses through-hole TO-92-3 packaging. The 2N918 PBFREE uses through-hole TO-72 packaging, compatible with existing through-hole PCB designs. The BFP405H6327XTSA1 uses surface-mount SOT-343 packaging, and the MT3S16U(TE85L,F) uses surface-mount SC-70 packaging. Surface-mount alternatives require PCB redesign and new assembly processes.