2N3663 Equivalent & Substitute Parts

Part Overview

The 2N3663 is an RF transistor NPN manufactured by onsemi, rated for 12V collector-emitter breakdown voltage with a transition frequency of 2.1GHz 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 where the 2N3663 is no longer readily available or manufactured.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	12V	V
Frequency - Transition	2.1GHz	GHz
Power - Max	350mW	mW
Current - Collector (Ic) (Max)	50mA	mA
DC Current Gain (hFE) (Min)	20	@ 8mA, 10V
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the 2N3663 is determined by the following critical parameters: transistor type (NPN), voltage rating, frequency capability, power dissipation, collector current rating, and DC current gain. Substitute parts must maintain electrical compatibility within the application's operating envelope.

The substitute parts are grouped into two categories based on mounting technology and performance characteristics:

Through-Hole Substitutes: Parts that maintain through-hole mounting compatibility with the original 2N3663, allowing direct board-level replacement without layout modification.

Surface-Mount Substitutes: Parts that offer superior electrical performance and modern packaging but require PCB redesign and assembly process changes. These are suitable for new designs or board revisions.

The following parameters determine substitution validity:

Transistor Type: NPN (all substitutes)
Voltage Rating: Must equal or exceed 12V (or be suitable for the application voltage)
Frequency Capability: Must support 2.1GHz operation or higher
Power Dissipation: Must support 350mW or higher
Collector Current: Must support 50mA or higher
DC Current Gain: Must meet or exceed 20 at specified conditions

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Voltage (Max)	Frequency	Power (Max)	Ic (Max)	hFE (Min)	Mounting Type	Package	Product Status
2N3663	onsemi	NPN	12V	2.1GHz	350mW	50mA	20	Through Hole	TO-92-3	Obsolete
2N918 PBFREE	Central Semiconductor Corp	NPN	15V	600MHz	200mW	50mA	20	Through Hole	TO-72	Active
BFP405H6327XTSA1	Infineon Technologies	NPN	5V	25GHz	75mW	25mA	60	Surface Mount	SOT-343	Active
BFR106E6327HTSA1	Infineon Technologies	NPN	15V	5GHz	700mW	210mA	70	Surface Mount	SOT-23-3	Active
BFR360FH6327XTSA1	Infineon Technologies	NPN	9V	14GHz	210mW	35mA	90	Surface Mount	SOT-723	Active
BFR380L3E6327XTMA1	Infineon Technologies	NPN	9V	14GHz	380mW	80mA	90	Surface Mount	SOT-883	Active
MT3S16U(TE85L,F)	Toshiba Semiconductor and Storage	NPN	5V	4GHz	100mW	60mA	80	Surface Mount	SC-70	Active

Engineering Selection Recommendations

For Through-Hole Replacement (Direct Board Compatibility):

The 2N918 PBFREE is the only through-hole substitute available. It is manufactured by Central Semiconductor Corp and carries Active product status with RoHS3 compliance. The 2N918 PBFREE provides a higher voltage rating (15V vs. 12V), matching collector current capability (50mA), and equivalent DC current gain (20). However, the transition frequency is lower at 600MHz compared to the 2N3663's 2.1GHz, and power dissipation is reduced to 200mW. This part is suitable for applications where frequency requirements do not exceed 600MHz and where the lower power rating is acceptable.

For Surface-Mount Designs (New Designs or Board Revisions):

Multiple active surface-mount alternatives are available from Infineon Technologies and Toshiba Semiconductor, all carrying RoHS3 compliance and REACH Unaffected status:

BFR106E6327HTSA1 (Infineon, SOT-23-3): Provides the highest power dissipation (700mW) and collector current (210mA) among all substitutes, with 15V voltage rating matching the original specification envelope. Transition frequency of 5GHz exceeds the 2N3663 requirement. Suitable for high-power RF applications.
BFR380L3E6327XTMA1 (Infineon, SOT-883): Offers 380mW power dissipation and 80mA collector current with 14GHz transition frequency. Voltage rating of 9V is lower than the original but suitable for lower-voltage RF circuits.
BFR360FH6327XTSA1 (Infineon, SOT-723): Provides 14GHz transition frequency with 210mW power dissipation and 35mA collector current. Compact SOT-723 package for space-constrained applications.
MT3S16U(TE85L,F) (Toshiba, SC-70): Offers 4GHz transition frequency with 60mA collector current and 100mW power dissipation. RoHS Compliant status. Suitable for moderate-frequency RF applications.
BFP405H6327XTSA1 (Infineon, SOT-343): Highest transition frequency at 25GHz with lowest power rating (75mW) and collector current (25mA). Voltage rating of 5V limits application scope. Suitable for ultra-high-frequency applications with lower power requirements.

All surface-mount substitutes carry Active product status, ensuring long-term availability and supply chain stability compared to the obsolete 2N3663.

Frequently Asked Questions (FAQ)

Q: Can the 2N918 PBFREE be used as a direct replacement for the 2N3663 in existing PCBs?

A: Yes, the 2N918 PBFREE maintains through-hole mounting compatibility with the TO-92-3 package. However, the lower transition frequency (600MHz vs. 2.1GHz) must be verified against the application's frequency requirements. The reduced power rating (200mW vs. 350mW) must also be confirmed as acceptable for the circuit design.

Q: What is the primary limitation of surface-mount substitutes compared to the 2N3663?

A: Surface-mount substitutes require PCB redesign and different assembly processes. They cannot be directly installed into existing through-hole footprints without board modification. However, they offer superior electrical performance, modern compliance certifications (RoHS3), and active product status with guaranteed long-term availability.

Q: Which substitute part offers the closest electrical match to the 2N3663?

A: The BFR106E6327HTSA1 provides the most comprehensive electrical match, with voltage rating of 15V (exceeding the 12V requirement), transition frequency of 5GHz (exceeding 2.1GHz), and power dissipation of 700mW (exceeding 350mW). Collector current capability of 210mA also exceeds the 50mA requirement. This part is suitable for applications requiring performance equal to or greater than the original specification.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed carry either RoHS3 Compliant or RoHS Compliant status. The 2N918 PBFREE carries RoHS3 Compliant designation. All Infineon parts carry RoHS3 Compliant status. The MT3S16U(TE85L,F) carries RoHS Compliant status. All parts are REACH Unaffected.

Q: What package considerations apply when selecting a surface-mount substitute?

A: Surface-mount substitutes are available in multiple packages: SOT-23-3 (BFR106E6327HTSA1), SOT-343 (BFP405H6327XTSA1), SOT-723 (BFR360FH6327XTSA1), SOT-883 (BFR380L3E6327XTMA1), and SC-70 (MT3S16U(TE85L,F)). Package selection depends on PCB layout constraints, thermal management requirements, and assembly equipment capabilities. Smaller packages (SOT-723, SOT-343) offer space savings but may present thermal challenges in high-power applications.

Q: Can the 2N3663 be replaced with a lower-voltage substitute in a 12V circuit?

A: Substitutes with voltage ratings lower than 12V (such as BFP405H6327XTSA1 at 5V or BFR360FH6327XTSA1 at 9V) must be evaluated against the actual operating voltage of the circuit. If the circuit operates at or near the rated voltage, lower-rated substitutes may not provide adequate voltage margin and could result in device failure. Verification of actual circuit operating conditions is required before selecting lower-voltage alternatives.

Q: What is the significance of the "Active" product status for substitute parts?

A: Active product status indicates that the manufacturer continues to produce and support the part, ensuring long-term availability, consistent quality, and supply chain reliability. This contrasts with the 2N3663's Obsolete status, where production has ceased and availability is limited to existing inventory. Selection of Active substitutes provides design security and production continuity.

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