2SC5508-T2-A Equivalent & Substitute Parts

Part Overview

The 2SC5508-T2-A is an RF transistor NPN manufactured by CEL, designed for high-frequency applications up to 25GHz with a maximum collector-emitter breakdown voltage of 3.3V and power dissipation of 115mW. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning. Substitute parts must maintain compatibility with the original electrical specifications and mounting requirements while considering current product availability and active status.

Key Parameters

Parameter	2SC5508-T2-A
Manufacturer	CEL
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	3.3V
Frequency - Transition	25GHz
Noise Figure (dB Typ @ f)	1.1dB @ 2GHz
Gain	17dB
Power - Max	115mW
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 5mA, 2V
Current - Collector (Ic) (Max)	35mA
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-82A, SOT-343
Supplier Device Package	SOT-343
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 2SC5508-T2-A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (mandatory match)
Frequency - Transition: 25GHz (mandatory match for RF performance)
Voltage - Collector Emitter Breakdown: minimum 3.3V (equal or greater)
Current - Collector (Ic) (Max): minimum 35mA (equal or greater)
Power - Max: minimum 115mW (equal or greater)
Mounting Type: Surface Mount (mandatory match)
Operating Temperature: 150°C (TJ) (mandatory match)

Secondary Compatibility Factors:

Noise Figure and Gain characteristics within acceptable RF performance envelope
DC Current Gain (hFE) compatibility for circuit biasing
Package form factor compatibility (SOT-343 or equivalent 4-pin surface mount)
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped based on their ability to satisfy these parameters while maintaining functional equivalence in RF applications operating at 25GHz.

Parameter Comparison

Parameter	2SC5508-T2-A	BFP420FH6327XTSA1	NSVF4009SG4T1G	BFU630F,115	MCH4020-TL-H
Manufacturer	CEL	Infineon Technologies	onsemi	NXP USA Inc.	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	3.3V	5.5V	3.5V	5.5V	8V
Frequency - Transition	25GHz	25GHz	25GHz	21GHz	16GHz
Noise Figure (dB Typ @ f)	1.1dB @ 2GHz	1.1dB @ 1.8GHz	1.1dB @ 2GHz	0.75dB ~ 1.3dB @ 1.5GHz ~ 5.8GHz	1.2dB @ 1GHz
Gain	17dB	19.5dB	17dB	13dB ~ 22.5dB	17.5dB @ 1GHz
Power - Max	115mW	160mW	120mW	200mW	400mW
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 5mA, 2V	60 @ 5mA, 4V	50 @ 5mA, 1V	90 @ 5mA, 2V	60 @ 50mA, 5V
Current - Collector (Ic) (Max)	35mA	35mA	40mA	30mA	150mA
Operating Temperature	150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)	150°C (TJ)	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-82A, SOT-343	4-SMD, Flat Leads	4-SMD, Flat Leads	SOT-343F	SOT-343F
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

BFP420FH6327XTSA1 (Infineon Technologies) is the most direct substitute for the 2SC5508-T2-A. This part maintains the critical 25GHz transition frequency specification, matches the 35mA maximum collector current, and exceeds the minimum power dissipation requirement at 160mW. The voltage rating of 5.5V provides operational margin above the original 3.3V specification. This part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity rating. The 4-TSFP package is mechanically compatible with SOT-343 form factor requirements.

NSVF4009SG4T1G (onsemi) provides equivalent 25GHz frequency performance with a 3.5V voltage rating closely matching the original 3.3V specification. Maximum collector current of 40mA exceeds the 35mA requirement, and power dissipation of 120mW meets the 115mW minimum. This part carries AEC-Q101 automotive qualification and ROHS3 compliance. Extended operating temperature range of -55°C to 150°C provides additional thermal margin. The SC-82FL/MCPH4 package maintains 4-pin surface mount compatibility.

Secondary Substitutes (Acceptable with Design Verification):

BFU630F,115 (NXP USA Inc.) operates at 21GHz, which is below the original 25GHz specification but remains suitable for applications not requiring the full 25GHz bandwidth. The 5.5V voltage rating and 200mW power dissipation exceed original specifications. Maximum collector current of 30mA is slightly below the 35mA original specification. This part is active, ROHS3 compliant, and available in SOT-343F package.

MCH4020-TL-H (onsemi) operates at 16GHz, representing a significant reduction from the original 25GHz specification. This part is suitable only for applications with reduced frequency requirements. The 8V voltage rating and 400mW power dissipation substantially exceed original specifications. Maximum collector current of 150mA far exceeds the 35mA requirement. This part is active and ROHS3 compliant with SOT-343F package compatibility.

Not Recommended:

The following parts do not meet substitution criteria and are not recommended:

2SC5488A-TL-H: 7GHz frequency is insufficient for 25GHz applications
BFP840FESDH6327XTSA1: 2.6V voltage rating is below the 3.3V minimum requirement
BFQ790H6327XTSA1: Obsolete status and 1.85GHz frequency are unsuitable
KST10MTF: 650MHz frequency is insufficient for 25GHz applications
MMBT5179: 2GHz frequency is insufficient for 25GHz applications

Frequently Asked Questions (FAQ)

Q: Why is the 2SC5508-T2-A classified as obsolete?

A: The 2SC5508-T2-A is listed as obsolete by the manufacturer CEL. Obsolete status indicates the part is no longer in active production. Active substitutes from manufacturers such as Infineon Technologies, onsemi, and NXP USA Inc. provide equivalent or superior performance with current manufacturing support and compliance certifications.

Q: What is the most critical parameter for substitution?

A: The transition frequency of 25GHz is the most critical parameter. Any substitute must operate at or above 25GHz to maintain RF performance in applications designed for this frequency band. Parts operating below 25GHz (such as 21GHz, 16GHz, or lower) are not suitable for direct substitution unless the application circuit is redesigned.

Q: Can I use BFU630F,115 as a substitute?

A: BFU630F,115 operates at 21GHz, which is below the original 25GHz specification. This part is acceptable only if your application does not require the full 25GHz bandwidth. All other electrical parameters are compatible or exceed the original specification. Design verification is required to confirm frequency performance is acceptable for your specific circuit.

Q: What is the difference between the package designations SOT-343 and 4-TSFP?

A: SOT-343 and 4-TSFP are both 4-pin surface mount packages with similar physical dimensions and pin configurations. These packages are mechanically and electrically compatible for PCB layout purposes. Verify specific pin assignments and thermal characteristics in the respective component datasheets before final design implementation.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant. The original 2SC5508-T2-A does not specify RoHS status. If RoHS compliance is a requirement for your application, all listed active substitutes meet this requirement.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level (MSL) 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All parts listed, including the original 2SC5508-T2-A and all substitutes, carry MSL 1 rating, eliminating moisture-related handling concerns.

Q: Can I substitute BFP420FH6327XTSA1 without circuit modifications?

A: BFP420FH6327XTSA1 maintains the critical 25GHz frequency specification and matches the 35mA collector current requirement. The higher voltage rating (5.5V vs. 3.3V) and increased power dissipation (160mW vs. 115mW) are compatible with most circuit designs. However, verify DC biasing conditions and thermal management in your specific application before implementation.

Q: Why is NSVF4009SG4T1G listed with automotive qualification?

A: NSVF4009SG4T1G carries AEC-Q101 automotive qualification, indicating it meets automotive industry reliability and performance standards. This qualification is optional for non-automotive applications but provides additional assurance of component quality and consistency.

Q: What is the significance of the extended temperature range in NSVF4009SG4T1G?

A: NSVF4009SG4T1G specifies an operating temperature range of -55°C to 150°C, compared to the original 2SC5508-T2-A specification of 150°C (TJ). The extended lower temperature limit provides operational capability in cold environments. This is beneficial for applications requiring wide temperature range operation but is not required for direct substitution if your application operates within the original temperature specification.

Q: Are there any package compatibility issues between substitutes?

A: All recommended primary substitutes (BFP420FH6327XTSA1, NSVF4009SG4T1G, and BFU630F,115) use 4-pin surface mount packages compatible with SOT-343 form factor. Verify specific pin assignments, lead spacing, and thermal pad configurations in component datasheets. Secondary substitutes (MCH4020-TL-H) also use SOT-343F package but operate at reduced frequency and require application-specific evaluation.

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