2SC4226-A RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The 2SC4226-A is an RF transistor NPN manufactured by CEL, designed for RF applications operating at 4.5GHz with a maximum collector-emitter breakdown voltage of 12V and maximum power dissipation of 150mW. The device is packaged in SC-70-3 surface mount configuration and is classified as obsolete product status.

Due to the obsolete status of the 2SC4226-A, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. The substitute parts listed below provide functional equivalence based on electrical performance parameters and mechanical compatibility within defined operating ranges.

Key Parameters

Parameter	2SC4226-A	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	12V	V
Frequency - Transition	4.5GHz	GHz
Noise Figure (Typ @ f)	1.2dB @ 1GHz	dB
Gain	9dB	dB
Power - Max	150mW	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 7mA, 3V	—
Current - Collector (Ic) (Max)	100mA	mA
Operating Temperature (TJ)	150°C	°C
Mounting Type	Surface Mount	—
Package / Case	SC-70, SOT-323	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 2SC4226-A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown (Max): Minimum 12V to maintain voltage margin compatibility
Frequency - Transition: Minimum 4.5GHz to support RF application bandwidth
Power - Max: Minimum 150mW to handle thermal dissipation requirements
Current - Collector (Ic) (Max): Minimum 100mA to support circuit current demands
Mounting Type: Surface Mount required
Operating Temperature: Maximum 150°C (TJ) to match thermal specifications

Secondary Compatibility Factors:

Package / Case: SC-70 or SOT-323 preferred for mechanical fit; alternative SOT packages acceptable with PCB layout verification
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred to match handling requirements
Product Status: Active status preferred to ensure long-term availability

The substitute parts listed below meet or exceed the primary substitution criteria. Parts are grouped by their electrical performance characteristics relative to the original 2SC4226-A specification.

Parameter Comparison

Part Number	Manufacturer	Vce (Max) [V]	Frequency [GHz]	Power (Max) [mW]	Ic (Max) [mA]	Package	Product Status
2SC4226-A	CEL	12	4.5	150	100	SC-70, SOT-323	Obsolete
BFR93AWH6327XTSA1	Infineon Technologies	12	6	300	90	SC-70, SOT-323	Active
BFP196WH6327XTSA1	Infineon Technologies	12	7.5	700	150	SC-82A, SOT-343	Active
BFP196WNH6327XTSA1	Infineon Technologies	12	7.5	700	150	SC-82A, SOT-343	Active
BFP450H6327XTSA1	Infineon Technologies	5	24	450	100	SC-82A, SOT-343	Active
BFP620H7764XTSA1	Infineon Technologies	2.8	65	185	80	SC-82A, SOT-343	Active
BFP720H6327XTSA1	Infineon Technologies	4.7	45	100	25	SC-82A, SOT-343	Active
BFP842ESDH6327XTSA1	Infineon Technologies	3.7	60	120	40	SC-82A, SOT-343	Active
BFQ19SH6327XTSA1	Infineon Technologies	15	5.5	1000	120	TO-243AA	Active
BFR380FH6327XTSA1	Infineon Technologies	9	14	380	80	SOT-723	Active
CMPT918 TR PBFREE	Central Semiconductor Corp	15	0.6	350	50	TO-236-3, SC-59, SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitute (Recommended for Direct Replacement):

BFR93AWH6327XTSA1 (Infineon Technologies) is the primary recommended substitute for the 2SC4226-A. This part maintains identical collector-emitter breakdown voltage (12V), operates at higher frequency (6GHz versus 4.5GHz), provides increased power dissipation capability (300mW versus 150mW), and is packaged in the same SC-70, SOT-323 configuration. The part is Active status with ROHS3 compliance and unlimited moisture sensitivity level. Mechanical and electrical compatibility is direct with no PCB layout modifications required.

Secondary Substitutes (Voltage-Compatible, Package Adaptation Required):

BFP196WH6327XTSA1 and BFP196WNH6327XTSA1 (Infineon Technologies) maintain the 12V collector-emitter breakdown voltage specification and provide superior frequency performance (7.5GHz) and power handling (700mW). These parts are packaged in SC-82A, SOT-343 configuration, requiring PCB footprint verification and potential layout adaptation. Both parts are Active status with ROHS3 compliance.

BFQ19SH6327XTSA1 (Infineon Technologies) provides higher voltage rating (15V) and increased power dissipation (1W), suitable for applications requiring enhanced thermal margin. Packaged in TO-243AA (SOT-89), this part requires PCB layout modification. Active status with ROHS3 compliance.

Application-Specific Alternatives:

BFP450H6327XTSA1, BFP620H7764XTSA1, BFP720H6327XTSA1, and BFP842ESDH6327XTSA1 are high-frequency RF transistors with frequency capabilities ranging from 24GHz to 65GHz. These parts are suitable for applications requiring extended frequency performance beyond the 4.5GHz specification of the 2SC4226-A. Voltage ratings and current handling vary; circuit design verification is required. All parts are Active status with ROHS3 compliance.

Lower-Frequency Alternative:

CMPT918 TR PBFREE (Central Semiconductor Corp) operates at 600MHz frequency, suitable only for applications where RF frequency requirements are significantly lower than the original 4.5GHz specification. This part is not recommended as a direct substitute due to frequency mismatch. Active status with ROHS3 compliance.

Compliance and Availability:

All recommended substitute parts are Active product status, ensuring long-term availability and supply chain continuity. All parts comply with ROHS3 requirements and maintain REACH Unaffected status. Moisture sensitivity level is MSL 1 (Unlimited) for all substitutes, matching the original part specification.

Frequently Asked Questions (FAQ)

Q: Can BFR93AWH6327XTSA1 be used as a direct replacement for 2SC4226-A without PCB modifications?

A: Yes. BFR93AWH6327XTSA1 is packaged in SC-70, SOT-323 configuration, identical to the 2SC4226-A. The footprint is mechanically compatible, and electrical parameters meet or exceed the original specification. No PCB layout modifications are required.

Q: What is the primary difference between BFP196WH6327XTSA1 and BFP196WNH6327XTSA1?

A: Both parts are electrically identical with 12V collector-emitter breakdown voltage and 7.5GHz frequency. The primary difference is packaging format: BFP196WH6327XTSA1 is supplied in Cut Tape (CT) & Digi-Reel format, while BFP196WNH6327XTSA1 is supplied in Tape & Reel (TR) format. Both require PCB footprint adaptation from the original SC-70, SOT-323 package to SC-82A, SOT-343 configuration.

Q: Why is CMPT918 TR PBFREE not recommended as a substitute?

A: CMPT918 TR PBFREE operates at 600MHz transition frequency, significantly below the 4.5GHz specification of the 2SC4226-A. This frequency limitation makes it unsuitable for RF applications requiring 4.5GHz or higher performance. The part is listed as a historical reference only.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of using BFP450H6327XTSA1 in a circuit designed for 2SC4226-A?

A: BFP450H6327XTSA1 has a lower collector-emitter breakdown voltage (5V versus 12V), which may limit voltage margin in the circuit. However, it provides significantly higher frequency capability (24GHz). This part is suitable only for applications where the 5V voltage rating is acceptable and where extended frequency performance is beneficial. Circuit design verification is required.

Q: What packaging considerations apply when substituting with BFQ19SH6327XTSA1?

A: BFQ19SH6327XTSA1 is packaged in TO-243AA (SOT-89) configuration, which differs from the original SC-70, SOT-323 package. PCB footprint modification is required. The part provides higher voltage rating (15V) and increased power dissipation (1W), making it suitable for applications requiring enhanced thermal performance.

Q: Can substitute parts with higher frequency ratings be used in circuits designed for 4.5GHz operation?

A: Yes. Substitute parts with higher frequency ratings (such as BFP620H7764XTSA1 at 65GHz or BFP720H6327XTSA1 at 45GHz) can be used in circuits designed for lower frequencies. The higher frequency capability provides design margin and does not degrade performance at lower operating frequencies. Electrical parameter compatibility (voltage, current, power) must be verified for the specific application.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control during storage or handling. This matches the original 2SC4226-A specification and simplifies supply chain management and component storage procedures.

Q: Are there any ECCN or HTSUS code differences between the main part and substitutes?

A: All parts listed share identical ECCN (EAR99) and HTSUS codes (8541.21.0075 or 8541.29.0075), indicating equivalent export classification and tariff treatment. No additional regulatory documentation is required for substitution.

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