SS9018FBU Equivalent & Substitute Parts

Part Overview

The SS9018FBU is an RF transistor NPN manufactured by onsemi, rated for 15V collector-emitter breakdown voltage with a transition frequency of 1.1GHz and maximum power dissipation of 400mW. 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. Substitute parts listed below provide functional alternatives with varying electrical specifications and mounting technologies.

Substiute Parts

SS9018FBU

onsemiIn Stock: 784SS9018FBU Datasheet

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BFP450H6327XTSA1

Infineon TechnologiesIn Stock: 9166BFP450H6327XTSA1 Datasheet

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BFR182WH6327XTSA1

Infineon TechnologiesIn Stock: 3270BFR182WH6327XTSA1 Datasheet

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MAPR-002729-170M00

MACOM Technology SolutionsIn Stock: 857MAPR-002729-170M00 Datasheet

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PH3135-5S

MACOM Technology SolutionsIn Stock: 827PH3135-5S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS9018FBU is determined by the following critical parameters: transistor type (NPN), voltage rating, frequency capability, power dissipation, collector current capacity, and DC current gain. The substitute parts listed below are grouped based on their ability to operate within or exceed the electrical specifications of the main part.

Critical Substitution Parameters:

• Transistor Type: NPN (all substitutes match)
• Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 15V
• Frequency - Transition: Must support RF operation at or above 1.1GHz
• Power - Max: Must equal or exceed 400mW
• Current - Collector (Ic) (Max): Must equal or exceed 50mA
• DC Current Gain (hFE): Must provide adequate gain for circuit operation
• Operating Temperature: Must support 150°C or higher
• RoHS Compliance: ROHS3 Compliant (all substitutes match)

Substitution Grouping:

Group 1 - High Frequency Surface Mount Alternatives: BFP450H6327XTSA1 and BFR182WH6327XTSA1 are surface-mount RF transistors with significantly higher transition frequencies (24GHz and 8GHz respectively) and active product status. These parts exceed the frequency and power specifications of the SS9018FBU but operate at lower voltage ratings (5V and 12V respectively).

Group 2 - High Power Chassis Mount Alternatives: MAPR-002729-170M00 and PH3135-5S are high-power RF transistors designed for chassis-mount applications with substantially higher voltage ratings (65V and 60V respectively) and power dissipation capabilities (170W and 5W respectively). These parts are suited for applications requiring higher power handling and voltage tolerance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Electrical Substitution with Mounting Consideration:

BFP450H6327XTSA1 and BFR182WH6327XTSA1 are active-status RF transistors from Infineon Technologies suitable for applications where surface-mount technology is acceptable. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). BFP450H6327XTSA1 provides higher collector current capacity (100mA) and superior frequency performance (24GHz), while BFR182WH6327XTSA1 offers voltage rating closer to the original specification (12V) with enhanced gain characteristics (19dB). Selection between these two depends on circuit voltage requirements and frequency operating point.

For High Power Applications:

MAPR-002729-170M00 and PH3135-5S are active-status RF transistors from MACOM Technology Solutions designed for high-power RF applications. MAPR-002729-170M00 supports substantially higher power dissipation (170W) and collector current (27A) with elevated operating temperature capability (200°C). PH3135-5S provides intermediate power handling (5W) with 60V voltage rating and 750mA collector current. Both maintain ROHS3 compliance and are suitable for applications requiring power levels significantly exceeding the SS9018FBU specification.

Compliance and Availability:

All substitute parts are ROHS3 compliant and carry EAR99 ECCN classification matching the original part. BFP450H6327XTSA1 and BFR182WH6327XTSA1 maintain the same operating temperature maximum (150°C) as the SS9018FBU. MAPR-002729-170M00 and PH3135-5S provide enhanced thermal capability at 200°C. All substitute parts are currently in active production status with documented inventory availability.

Frequently Asked Questions (FAQ)

Q: Can BFP450H6327XTSA1 directly replace SS9018FBU in existing through-hole PCB designs?

A: No. BFP450H6327XTSA1 is a surface-mount device in SOT-343 package, while SS9018FBU uses through-hole TO-92-3 packaging. PCB layout and footprint modifications are required. Additionally, the voltage rating of BFP450H6327XTSA1 (5V maximum) is lower than SS9018FBU (15V maximum), requiring circuit voltage verification.

Q: What is the primary difference between BFP450H6327XTSA1 and BFR182WH6327XTSA1?

A: BFP450H6327XTSA1 operates at 5V maximum with 24GHz transition frequency and 100mA collector current. BFR182WH6327XTSA1 operates at 12V maximum with 8GHz transition frequency and 35mA collector current. BFR182WH6327XTSA1 provides voltage rating closer to the original SS9018FBU specification (15V), while BFP450H6327XTSA1 offers superior frequency performance and current capacity.

Q: Are MAPR-002729-170M00 and PH3135-5S suitable for low-power RF applications?

A: MAPR-002729-170M00 and PH3135-5S are designed for high-power RF applications with power dissipation ratings of 170W and 5W respectively. These parts are oversized for low-power applications equivalent to SS9018FBU (400mW). Selection should be based on actual circuit power requirements and voltage specifications.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed (BFP450H6327XTSA1, BFR182WH6327XTSA1, MAPR-002729-170M00, and PH3135-5S) are ROHS3 compliant, matching the compliance status of SS9018FBU.

Q: What is the operating temperature range difference between substitute options?

A: BFP450H6327XTSA1 and BFR182WH6327XTSA1 maintain the same maximum junction temperature as SS9018FBU at 150°C. MAPR-002729-170M00 and PH3135-5S provide enhanced thermal capability with 200°C maximum junction temperature, suitable for high-temperature operating environments.

Q: Which substitute part most closely matches the electrical specifications of SS9018FBU?

A: BFR182WH6327XTSA1 provides the closest voltage rating match (12V versus 15V) and maintains comparable operating temperature (150°C). However, it operates at lower collector current (35mA versus 50mA) and lower power dissipation (250mW versus 400mW). BFP450H6327XTSA1 exceeds power and current specifications but operates at significantly lower voltage (5V).

Q: Can through-hole SS9018FBU designs be converted to surface-mount using substitute parts?

A: Yes. BFP450H6327XTSA1 and BFR182WH6327XTSA1 are surface-mount alternatives. Design conversion requires PCB layout modification, footprint redesign, and circuit voltage verification. BFR182WH6327XTSA1 is recommended for designs operating at or near 12-15V supply voltage.