2SC5646A-TL-H RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The 2SC5646A-TL-H is an RF transistor NPN manufactured by onsemi, designed for high-frequency applications operating in the 10GHz to 12.5GHz frequency range. This device is rated for 4V collector-emitter breakdown voltage, 30mA maximum collector current, and 100mW maximum power dissipation in a 3-SSFP surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	4V	V
Frequency - Transition	10GHz ~ 12.5GHz	GHz
Power - Max	100mW	mW
Current - Collector (Ic) (Max)	30mA	mA
Operating Temperature	150°C	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SC-81 (3-SSFP)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SC5646A-TL-H is determined by compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Operating Temperature: 150°C maximum junction temperature (required match)
Mounting Type: Surface Mount (required match)
RoHS Status: ROHS3 Compliant (required match)
Moisture Sensitivity Level: 1 (Unlimited) (required match)

Application-Dependent Criteria:

Voltage - Collector Emitter Breakdown (Max): 4V minimum required
Frequency - Transition: 10GHz minimum required for RF performance
Power - Max: 100mW minimum required
Current - Collector (Ic) (Max): 30mA minimum required

Substitute parts are grouped into two categories: MFR Recommended (same manufacturer, active product status) and Similar (alternative manufacturers, active product status). Parts within each category maintain the core electrical and mechanical compatibility parameters while offering variations in frequency response, power handling, and package form factors to accommodate different circuit requirements.

Parameter Comparison

Parameter	2SC5646A-TL-H	2SC5488A-TL-H	BFP196E6327HTSA1	BFP420H6327XTSA1	BFR360FH6327XTSA1	BFS17NTA
Manufacturer	onsemi	onsemi	Infineon Technologies	Infineon Technologies	Infineon Technologies	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	4V	10V	12V	5V	9V	11V
Frequency - Transition	10GHz ~ 12.5GHz	7GHz	7.5GHz	25GHz	14GHz	3.2GHz
Power - Max	100mW	100mW	700mW	160mW	210mW	330mW
Current - Collector (Ic) (Max)	30mA	70mA	150mA	35mA	35mA	50mA
Operating Temperature	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-81 (3-SSFP)	SC-81 (3-SSFP)	TO-253-4, TO-253AA (PG-SOT-143-3D)	SC-82A, SOT-343 (PG-SOT343-3D)	SOT-723 (PG-TSFP-3)	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

2SC5488A-TL-H (MFR Recommended Substitute)

The 2SC5488A-TL-H is the manufacturer-recommended substitute from onsemi. This part maintains identical package form factor (SC-81, 3-SSFP), operating temperature rating (150°C), and compliance certifications (ROHS3, MSL 1). The 2SC5488A-TL-H is an active product with higher inventory availability (11,541 pcs) compared to the obsolete 2SC5646A-TL-H. The primary trade-off is reduced frequency capability (7GHz versus 10GHz–12.5GHz) and increased voltage rating (10V versus 4V). This substitute is suitable for applications where the lower frequency specification is acceptable and the higher voltage rating provides additional design margin.

BFP420H6327XTSA1 (Similar Substitute - Highest Frequency)

The BFP420H6327XTSA1 from Infineon Technologies offers the highest frequency capability (25GHz) among all substitutes, exceeding the original part's 10GHz–12.5GHz specification. Voltage rating (5V) closely matches the original 4V specification. Current handling (35mA) exceeds the original 30mA requirement. Power dissipation (160mW) exceeds the original 100mW. Package form factor differs (SOT-343 versus 3-SSFP), requiring PCB layout modification. This substitute is suitable for applications requiring higher frequency performance with minimal voltage and current margin adjustments.

BFR360FH6327XTSA1 (Similar Substitute - Balanced Performance)

The BFR360FH6327XTSA1 from Infineon Technologies provides balanced performance with 14GHz frequency capability, 9V voltage rating, 35mA current capability, and 210mW power dissipation. All parameters exceed or match the original specification. Package form factor differs (SOT-723 versus 3-SSFP), requiring PCB layout modification. This substitute is suitable for applications where frequency performance between the original and highest-frequency options is required.

BFP196E6327HTSA1 (Similar Substitute - High Power)

The BFP196E6327HTSA1 from Infineon Technologies provides the highest power dissipation capability (700mW) and current handling (150mA) among all substitutes. Frequency capability (7.5GHz) is lower than the original specification. Voltage rating (12V) significantly exceeds the original 4V specification. Package form factor differs (TO-253-4 versus 3-SSFP), requiring PCB layout modification. This substitute is suitable for high-power applications where frequency requirements are below 7.5GHz.

BFS17NTA (Similar Substitute - Lower Frequency)

The BFS17NTA from Diodes Incorporated operates at 3.2GHz, significantly below the original 10GHz–12.5GHz specification. Voltage rating (11V) and power dissipation (330mW) exceed original specifications. Current handling (50mA) exceeds the original 30mA. Operating temperature range extends to -55°C. Package form factor differs (SOT-23-3 versus 3-SSFP), requiring PCB layout modification. This substitute is suitable only for applications where frequency requirements are 3.2GHz or lower.

Frequently Asked Questions (FAQ)

Q: Can the 2SC5488A-TL-H directly replace the 2SC5646A-TL-H without PCB modifications?

A: Yes. The 2SC5488A-TL-H uses the identical SC-81 (3-SSFP) package form factor and pin configuration as the 2SC5646A-TL-H. No PCB layout modifications are required. However, circuit performance will differ due to the reduced frequency specification (7GHz versus 10GHz–12.5GHz).

Q: Which substitute part maintains the closest electrical specifications to the original 2SC5646A-TL-H?

A: The 2SC5488A-TL-H maintains the closest match in package form factor, voltage rating proximity, and power dissipation. The BFP420H6327XTSA1 provides the closest frequency match (25GHz exceeds 10GHz–12.5GHz) and voltage rating match (5V versus 4V), but requires PCB layout modification due to different package form factor (SOT-343).

Q: What are the package form factor differences among the substitute parts?

A: The 2SC5488A-TL-H maintains the original SC-81 (3-SSFP) package. The BFP420H6327XTSA1 uses SOT-343 (SC-82A). The BFR360FH6327XTSA1 uses SOT-723. The BFP196E6327HTSA1 uses TO-253-4 (TO-253AA). The BFS17NTA uses SOT-23-3 (TO-236-3, SC-59). Different package form factors require PCB footprint redesign and may affect thermal management and signal integrity.

Q: Are all substitute parts RoHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed are ROHS3 compliant and rated MSL 1 (Unlimited moisture sensitivity level), matching the original 2SC5646A-TL-H compliance certifications.

Q: Which substitute part is recommended for RF applications requiring frequencies above 10GHz?

A: The BFP420H6327XTSA1 (25GHz) and BFR360FH6327XTSA1 (14GHz) both exceed the original 10GHz–12.5GHz specification. The BFP420H6327XTSA1 provides the highest frequency capability. Both require PCB layout modification due to different package form factors.

Q: What is the primary limitation of the BFS17NTA as a substitute?

A: The BFS17NTA operates at 3.2GHz, which is significantly below the original 10GHz–12.5GHz specification. This part is suitable only for applications where the required operating frequency is 3.2GHz or lower.

Q: Can substitute parts with higher voltage ratings be used in circuits designed for the 4V original specification?

A: Yes. Substitute parts with higher voltage ratings (2SC5488A-TL-H at 10V, BFP196E6327HTSA1 at 12V, BFR360FH6327XTSA1 at 9V, BFS17NTA at 11V) can be used in circuits designed for the 4V original specification. The higher voltage rating provides additional design margin and does not create compatibility issues. However, circuit performance characteristics may differ due to variations in other electrical parameters.

Q: Is the 2SC5488A-TL-H the only substitute that does not require PCB modifications?

A: Yes. The 2SC5488A-TL-H is the only substitute that maintains the identical SC-81 (3-SSFP) package form factor, allowing direct PCB replacement without layout modifications. All other substitute parts use different package form factors and require PCB footprint redesign.

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