2SC4093-A RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The 2SC4093-A is an RF transistor NPN manufactured by CEL, designed for high-frequency applications up to 7GHz with a maximum power dissipation of 200mW. This device operates at 12V collector-emitter breakdown voltage and is housed in a TO-253-4 (SOT-143) surface mount package. The part is classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning. Active alternatives with comparable or enhanced RF performance characteristics are available from multiple manufacturers including Infineon Technologies, NXP USA Inc., onsemi, and Toshiba Semiconductor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	12V	V
Frequency - Transition	7GHz	GHz
Noise Figure (Typ @ 1GHz)	1.1dB	dB
Gain	13dB	dB
Power - Max	200mW	mW
DC Current Gain (hFE Min @ 20mA, 10V)	50	—
Current - Collector (Ic Max)	100mA	mA
Operating Temperature (TJ)	150°C	°C
Mounting Type	Surface Mount	—
Package / Case	TO-253-4, TO-253AA	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 2SC4093-A is determined by alignment of the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be NPN
Voltage rating (Vce breakdown) must equal or exceed 12V
Frequency capability must support 7GHz operation or higher
Power dissipation must accommodate 200mW or greater
Maximum collector current must support 100mA or higher
Operating temperature range must include 150°C junction temperature
Surface mount packaging with compatible footprint

Secondary Compatibility Factors:

Noise figure performance at RF frequencies (1GHz and above)
DC current gain (hFE) characteristics
RoHS3 compliance and REACH status for regulatory alignment
Moisture sensitivity level (MSL 1 preferred for unlimited shelf life)

Substitute parts are grouped into two categories based on frequency performance and power handling:

Group A - Direct RF Performance Equivalents (7GHz+ Operation): Parts maintaining 7GHz or higher transition frequency with comparable or superior power handling and noise characteristics. These include BF771E6327HTSA1, BFU550VL, and 2SC5226A-5-TL-E.

Group B - Extended Frequency Performance (25GHz+ Operation): Parts exceeding 7GHz capability with enhanced gain and noise performance, suitable for applications requiring higher frequency headroom. These include BFP420H6740XTSA1, BFP520H6327XTSA1, BFP740H6327XTSA1, and BFR740L3RHE6327XTSA1.

Group C - Lower Frequency Alternative (550MHz Operation): The 2SC2714-Y(TE85L,F) operates at significantly lower frequency but maintains NPN configuration and surface mount packaging for applications not requiring 7GHz performance.

Group D - High Power Alternative (5W Operation): The PH3135-5S provides substantially higher power dissipation (5W) and collector current (750mA) for power amplification applications, though frequency specification is not provided.

Parameter Comparison

Part Number	Manufacturer	Vce (Max) V	Frequency GHz	Noise Figure dB	Gain dB	Power mW	Ic (Max) mA	hFE (Min)	Package	Status
2SC4093-A	CEL	12	7	1.1 @ 1GHz	13	200	100	50 @ 20mA, 10V	TO-253-4	Obsolete
BF771E6327HTSA1	Infineon	12	8	1.0~1.6 @ 900MHz~1.8GHz	10~15	580	80	70 @ 30mA, 8V	TO-236-3, SOT-23-3	Active
BFU550VL	NXP USA Inc.	12	11	1.3 @ 1.8GHz	15	450	50	60 @ 15mA, 8V	TO-253-4, TO-253AA	Active
2SC5226A-5-TL-E	onsemi	10	7	1 @ 1GHz	12	150	70	135 @ 20mA, 5V	SC-70, SOT-323	Active
2SC2714-Y(TE85L,F)	Toshiba	30	0.55	2.5 @ 100MHz	23	100	20	100 @ 1mA, 6V	TO-236-3, SOT-23-3	Active
BFP420H6740XTSA1	Infineon	5	25	1.1 @ 1.8GHz	21	160	35	60 @ 20mA, 4V	SC-82A, SOT-343	Active
BFP520H6327XTSA1	Infineon	3.5	45	0.95 @ 1.8GHz	22.5	100	40	70 @ 20mA, 2V	SC-82A, SOT-343	Active
BFP740H6327XTSA1	Infineon	4.7	42	0.5~0.85 @ 1.8GHz~6GHz	27	160	30	160 @ 25mA, 3V	SC-82A, SOT-343	Active
BFR740L3RHE6327XTSA1	Infineon	4.7	42	0.5~0.8 @ 1.8GHz~6GHz	24.5	160	30	160 @ 25mA, 3V	SC-101, SOT-883	Active
PH3135-5S	MACOM	60	—	—	8.5	5000	750	—	—	Active

Engineering Selection Recommendations

For Direct Replacement in 7GHz RF Applications:

The BFU550VL (NXP USA Inc.) provides the closest functional equivalence to the 2SC4093-A. Both devices maintain 12V Vce breakdown voltage, operate at comparable RF frequencies (11GHz vs. 7GHz), and are housed in identical TO-253-4 surface mount packages. The BFU550VL offers superior power handling (450mW vs. 200mW) and improved gain (15dB vs. 13dB) while maintaining acceptable noise figure (1.3dB @ 1.8GHz). This part is RoHS3 compliant and carries active product status with established supply chain availability.

The BF771E6327HTSA1 (Infineon Technologies) represents an alternative with matching 12V rating and 8GHz frequency capability. This device provides significantly enhanced power dissipation (580mW) and improved noise performance across the 900MHz to 1.8GHz band. Package compatibility requires evaluation, as this part uses TO-236-3 (SOT-23-3) footprint rather than TO-253-4.

For Applications Requiring Frequency Headroom:

The 2SC5226A-5-TL-E (onsemi) maintains 7GHz frequency matching with lower voltage rating (10V vs. 12V). This part is suitable for applications where 10V operation is acceptable and offers improved DC current gain characteristics. The SC-70 (SOT-323) package requires PCB layout modification.

For Extended Frequency Performance (25GHz+):

The BFP420H6740XTSA1, BFP520H6327XTSA1, BFP740H6327XTSA1, and BFR740L3RHE6327XTSA1 (all Infineon Technologies) provide substantially higher frequency capability (25GHz to 45GHz) with superior gain and noise characteristics. These parts are suitable for applications requiring frequency performance beyond 7GHz. Voltage ratings range from 3.5V to 5V, requiring circuit redesign for applications dependent on 12V operation. All parts carry RoHS3 compliance and active product status.

For Lower Frequency Applications:

The 2SC2714-Y(TE85L,F) (Toshiba Semiconductor) operates at 550MHz and is not suitable for 7GHz applications. This part is included in the substitute list but applies only to applications not requiring RF performance above 550MHz.

For High Power Amplification:

The PH3135-5S (MACOM Technology Solutions) provides 5W power dissipation and 750mA collector current for power amplification stages. This part is not suitable for direct replacement in small-signal RF applications but serves applications requiring substantially higher power handling.

Compliance and Supply Considerations:

All recommended active substitutes carry RoHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. Moisture sensitivity level (MSL 1) is consistent across all alternatives, providing unlimited shelf life storage. All parts are available in current inventory with established supply chain status.

Frequently Asked Questions (FAQ)

Q: Can the BFU550VL directly replace the 2SC4093-A without PCB modification?

A: The BFU550VL uses the same TO-253-4 (TO-253AA) package as the 2SC4093-A, enabling direct footprint compatibility. No PCB layout modification is required. Electrical performance is superior, with higher power handling and improved gain characteristics.

Q: What is the primary limitation when substituting with BFP420H6740XTSA1 or other high-frequency Infineon parts?

A: The primary limitation is voltage rating. These parts operate at 5V or lower (BFP420H6740XTSA1 at 5V, BFP520H6327XTSA1 at 3.5V, BFP740H6327XTSA1 at 4.7V), compared to the 2SC4093-A at 12V. Circuit redesign is required for applications dependent on 12V operation. These parts are suitable only for applications operating at their specified voltage levels.

Q: Why is the 2SC2714-Y(TE85L,F) listed as a substitute if it operates at only 550MHz?

A: The 2SC2714-Y(TE85L,F) is listed because it appears in the provided substitute list for the 2SC4093-A. However, its 550MHz frequency capability is substantially below the 7GHz requirement of the main part. This substitute applies only to applications not requiring RF performance above 550MHz and represents a significant frequency reduction.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed carry RoHS3 compliance status. The 2SC4093-A (obsolete) does not specify RoHS status. All alternatives meet current regulatory requirements for lead-free and restricted substance compliance.

Q: What package options are available among the substitute parts?

A: Package options include TO-253-4 (BFU550VL, matching the original), TO-236-3/SOT-23-3 (BF771E6327HTSA1, 2SC2714-Y(TE85L,F)), SC-70/SOT-323 (2SC5226A-5-TL-E), SC-82A/SOT-343 (BFP420H6740XTSA1, BFP520H6327XTSA1, BFP740H6327XTSA1), and SC-101/SOT-883 (BFR740L3RHE6327XTSA1). Package selection depends on PCB layout constraints and footprint availability.

Q: How do noise figure specifications compare across substitute options?

A: The 2SC4093-A specifies 1.1dB noise figure at 1GHz. Comparable alternatives include BF771E6327HTSA1 (1.0~1.6dB @ 900MHz~1.8GHz), BFU550VL (1.3dB @ 1.8GHz), and 2SC5226A-5-TL-E (1dB @ 1GHz). Higher-frequency parts show improved noise performance: BFP420H6740XTSA1 (1.1dB @ 1.8GHz), BFP520H6327XTSA1 (0.95dB @ 1.8GHz), and BFP740H6327XTSA1 (0.5~0.85dB @ 1.8GHz~6GHz).

Q: What is the significance of DC current gain (hFE) differences among substitutes?

A: DC current gain (hFE) affects biasing circuit design and amplification characteristics. The 2SC4093-A specifies hFE minimum of 50 @ 20mA, 10V. Substitutes show variation: BF771E6327HTSA1 (70 @ 30mA, 8V), BFU550VL (60 @ 15mA, 8V), 2SC5226A-5-TL-E (135 @ 20mA, 5V), and BFP740H6327XTSA1 (160 @ 25mA, 3V). Higher hFE values reduce base current requirements but may affect frequency response. Circuit biasing must be adjusted accordingly.

Q: Is the PH3135-5S suitable for RF small-signal applications?

A: No. The PH3135-5S is designed for power amplification with 5W dissipation and 750mA collector current. It is not suitable for small-signal RF applications equivalent to the 2SC4093-A. This part applies only to high-power amplification stages requiring substantially higher power handling than the original device.

Q: What inventory status should be considered when selecting a substitute?

A: All recommended active substitutes carry established inventory levels: BFU550VL (975 Pcs), BF771E6327HTSA1 (2817 Pcs), 2SC5226A-5-TL-E (4069 Pcs), BFP420H6740XTSA1 (9219 Pcs), BFP520H6327XTSA1 (35200 Pcs), BFP740H6327XTSA1 (14215 Pcs), and BFR740L3RHE6327XTSA1 (2353 Pcs). The 2SC4093-A (obsolete) has 969 Pcs remaining in stock. Long-term design should prioritize active parts with higher inventory levels.

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