2SC5084-O(TE85L,F) Equivalent & Substitute Parts

Part Overview

The 2SC5084-O(TE85L,F) is an RF transistor manufactured by Toshiba Semiconductor and Storage, classified as an NPN bipolar junction transistor (BJT) designed for RF applications. This component operates at 12V with a transition frequency of 7GHz and maximum power dissipation of 150mW in a surface mount S-Mini package. The part is currently obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	-
Voltage - Collector Emitter Breakdown (Max)	12V	V
Frequency - Transition	7GHz	GHz
Noise Figure (Typ @ f)	1.1dB @ 1GHz	dB
Gain	11dB	dB
Power - Max	150mW	mW
DC Current Gain (hFE) (Min)	80 @ 20mA, 10V	-
Current - Collector (Ic) (Max)	80mA	mA
Operating Temperature (TJ)	125°C	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	RoHS Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 2SC5084-O(TE85L,F) is determined by compatibility across the following critical parameters: transistor type (NPN), mounting technology (surface mount), package form factor, voltage rating, frequency capability, power dissipation, and current handling capacity. The substitute parts are grouped based on their ability to meet or exceed the electrical specifications of the original component while maintaining functional equivalence in RF circuit applications.

The following parameters establish substitution validity:

Transistor Type: NPN configuration required
Voltage Rating: Minimum 12V collector-emitter breakdown voltage
Frequency: Minimum 7GHz transition frequency
Power Dissipation: Minimum 150mW capability
Current Capacity: Minimum 80mA collector current
Mounting: Surface mount technology
Package Compatibility: SOT-23-3 or equivalent form factor

Parameter Comparison

Parameter	2SC5084-O(TE85L,F)	MT3S111(TE85L,F)	BFR181WH6327XTSA1	BFR460L3E6327XTMA1	KSP10TA	MRF455
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	12V	6V	12V	5.8V	25V	18V
Frequency - Transition	7GHz	11.5GHz	8GHz	22GHz	650MHz	-
Noise Figure (Typ @ f)	1.1dB @ 1GHz	1.2dB @ 1GHz	0.9dB ~ 1.2dB @ 900MHz ~ 1.8GHz	1.1dB ~ 1.35dB @ 1.8GHz ~ 3GHz	-	-
Gain	11dB	12dB	19dB	16dB	-	13dB
Power - Max	150mW	700mW	175mW	200mW	350mW	60W
DC Current Gain (hFE) (Min)	80 @ 20mA, 10V	200 @ 30mA, 5V	70 @ 5mA, 8V	90 @ 20mA, 3V	60 @ 4mA, 10V	10 @ 5A, 5V
Current - Collector (Ic) (Max)	80mA	100mA	20mA	50mA	-	15A
Operating Temperature (TJ)	125°C	150°C	150°C	150°C	150°C	-
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Chassis Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	SC-70, SOT-323	SC-101, SOT-883	TO-226-3, TO-92-3	211-07
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

BFR181WH6327XTSA1 (Infineon Technologies) is the primary direct substitute for the 2SC5084-O(TE85L,F). This component maintains identical voltage rating (12V), exceeds frequency capability (8GHz vs. 7GHz), and is housed in a compatible surface mount package (SOT-323). The BFR181WH6327XTSA1 is ROHS3 compliant with active product status and extensive inventory availability (275,300 units). The noise figure specification (0.9dB ~ 1.2dB @ 900MHz ~ 1.8GHz) is superior to the original part, and the gain specification (19dB) exceeds the original (11dB).

MT3S111(TE85L,F) (Toshiba Semiconductor and Storage) provides an alternative from the same manufacturer with identical package form factor (SOT-23-3). This part offers higher frequency capability (11.5GHz) and superior power dissipation (700mW), though the voltage rating is reduced to 6V. This substitute is suitable for applications where the 12V rating is not a critical constraint. The part is ROHS3 compliant with active status.

BFR460L3E6327XTMA1 (Infineon Technologies) represents an upgrade option with the highest frequency capability (22GHz) and improved gain (16dB). However, this component features a different package form factor (SOT-883) and reduced voltage rating (5.8V), requiring PCB layout modifications. This substitute is appropriate for applications prioritizing frequency performance over voltage headroom.

KSP10TA (Fairchild Semiconductor) and MRF455 (MACOM Technology Solutions) are not recommended as direct substitutes. KSP10TA operates at significantly lower frequency (650MHz) and uses through-hole packaging incompatible with surface mount designs. MRF455 is a chassis-mount power transistor designed for high-current applications (15A) and is not suitable for RF small-signal applications requiring the 2SC5084-O specifications.

Frequently Asked Questions (FAQ)

Q: Can the MT3S111(TE85L,F) be used as a direct replacement for the 2SC5084-O(TE85L,F)?

A: The MT3S111(TE85L,F) shares identical package form factor (SOT-23-3) and mounting technology (surface mount). However, the voltage rating is reduced from 12V to 6V. This substitute is valid only for applications where the circuit operates at or below 6V collector-emitter voltage. Both parts are from Toshiba and maintain compatible pinout configurations.

Q: What is the primary advantage of BFR181WH6327XTSA1 over the original 2SC5084-O(TE85L,F)?

A: The BFR181WH6327XTSA1 maintains the 12V voltage rating while providing superior noise figure performance (0.9dB ~ 1.2dB vs. 1.1dB), higher gain (19dB vs. 11dB), and active product status with extensive inventory. The component is ROHS3 compliant and housed in a compatible surface mount package (SOT-323).

Q: Why is BFR460L3E6327XTMA1 not recommended as a primary substitute?

A: While the BFR460L3E6327XTMA1 offers superior frequency capability (22GHz) and gain (16dB), it features a reduced voltage rating (5.8V) and different package form factor (SOT-883). PCB layout modifications are required for implementation, and the lower voltage rating may not satisfy applications requiring 12V operation.

Q: Are KSP10TA and MRF455 suitable alternatives?

A: Neither component is suitable as a direct substitute. KSP10TA operates at 650MHz transition frequency, significantly below the 7GHz requirement, and uses through-hole packaging incompatible with surface mount designs. MRF455 is a high-power chassis-mount transistor rated for 15A collector current and 60W power dissipation, designed for power amplification rather than RF small-signal applications.

Q: What packaging considerations apply when selecting a substitute?

A: The 2SC5084-O(TE85L,F) uses SOT-23-3 surface mount packaging. Direct substitutes maintaining this package form factor (MT3S111, BFR181WH6327XTSA1) require no PCB modifications. Alternatives using different packages (BFR460L3E6327XTMA1 with SOT-883) require PCB layout redesign and are not recommended for direct replacement applications.

Q: What is the significance of RoHS and MSL compliance in substitute selection?

A: The original 2SC5084-O(TE85L,F) is RoHS Compliant with MSL 1 (Unlimited). All recommended substitutes (MT3S111, BFR181WH6327XTSA1, BFR460L3E6327XTMA1) are ROHS3 Compliant with MSL 1 (Unlimited), ensuring compatibility with modern manufacturing processes and environmental regulations. These certifications confirm suitability for lead-free soldering and unlimited shelf life storage.

Q: How does product status affect substitute selection?

A: The original 2SC5084-O(TE85L,F) is obsolete, making substitution necessary. All recommended alternatives maintain active product status with established supply chains and ongoing manufacturer support. Active status ensures long-term availability and consistent manufacturing specifications.

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