MRF426 Equivalent & Substitute Parts Reference

Part Overview

The MRF426 is an RF Transistor NPN rated at 35V collector-emitter breakdown voltage with 3A maximum collector current and 25W maximum power dissipation. Manufactured by MACOM Technology Solutions, this chassis mount device (211-07 style) is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The MRF426 serves applications requiring moderate power RF amplification with robust voltage handling capabilities. Substitute parts become necessary when addressing supply constraints, packaging requirements, or application-specific performance parameters that differ from the original specification.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	35V	V
Current - Collector (Ic) (Max)	3A	A
Power - Max	25W	W
Gain	25dB	dB
DC Current Gain (hFE) (Min) @ Ic, Vce	10 @ 1A, 5V	—
Mounting Type	Chassis Mount	—
Package / Case	211-07, STYLE 1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MRF426 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 35V
Current Capability: Maximum collector current must support 3A or higher
Power Dissipation: Maximum power rating must accommodate 25W or higher
Gain Performance: Gain specification must align with 25dB requirement
DC Current Gain (hFE): Minimum hFE at specified operating point must be compatible with circuit design

Secondary Compatibility Factors:

Mounting Type: Chassis mount configuration
Package Type: 211-07 style or equivalent mechanical footprint
Compliance: ROHS3 compliance and MSL 1 rating

The substitute parts listed below are grouped based on their ability to meet these electrical specifications within the constraints of available packaging and mounting technologies. Surface mount alternatives (SOT-343, SOT-23-3, TSLP-3-1, 4-TSFP) represent different form factors suitable for alternative circuit board designs, while maintaining NPN transistor topology and active product status.

Parameter Comparison

Parameter	MRF426	BFR360L3E6765XTMA1	KST10MTF	BFP720FH6327XTSA1	BFP193WH6327XTSA1	BFS17NQTA	MMBT918LT1G
Manufacturer	MACOM	Infineon	onsemi	Infineon	Infineon	Diodes Inc.	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Vce Breakdown (Max)	35V	9V	25V	4.7V	12V	11V	15V
Ic (Max)	3A	35mA	—	25mA	80mA	50mA	50mA
Power - Max	25W	210mW	350mW	100mW	580mW	310mW	225mW
Gain	25dB	11.5dB ~ 16dB	—	10.5dB ~ 28dB	13.5dB ~ 20.5dB	—	11dB
Frequency - Transition	—	14GHz	650MHz	45GHz	8GHz	3.2GHz	600MHz
Mounting Type	Chassis Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	211-07, STYLE 1	SC-101, SOT-883	TO-236-3, SOT-23-3	4-SMD, Flat Leads	SC-82A, SOT-343	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Voltage and Current Capability Assessment:

The MRF426 operates at 35V maximum collector-emitter breakdown voltage with 3A maximum collector current. All listed substitute parts operate at lower voltage ratings (4.7V to 25V) and reduced current capabilities (25mA to 80mA maximum). Direct electrical substitution at the original 35V/3A specification is not supported by the provided substitute parts.

Application-Specific Selection:

BFR360L3E6765XTMA1 (Infineon): Rated 9V/35mA/210mW with 14GHz transition frequency. Suitable for moderate-power RF applications requiring higher frequency performance than the original specification.
KST10MTF (onsemi): Rated 25V/350mW with 650MHz transition frequency. Maintains closest voltage rating (25V) to the MRF426 among surface mount alternatives, though current capability is significantly reduced.
BFP720FH6327XTSA1 (Infineon): Rated 4.7V/25mA/100mW with 45GHz transition frequency. Applicable only to low-voltage, high-frequency RF applications.
BFP193WH6327XTSA1 (Infineon): Rated 12V/80mA/580mW with 8GHz transition frequency. Provides moderate voltage and current handling with enhanced frequency performance.
BFS17NQTA (Diodes Incorporated): Rated 11V/50mA/310mW with 3.2GHz transition frequency. Offers balanced performance across voltage, current, and frequency parameters.
MMBT918LT1G (onsemi): Rated 15V/50mA/225mW with 600MHz transition frequency. Suitable for lower-power RF applications with moderate frequency requirements.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original MRF426 environmental specifications. All parts are classified as active products with current manufacturing support.

Packaging Transition:

The MRF426 chassis mount configuration (211-07 style) differs fundamentally from all listed substitutes, which employ surface mount technologies (SOT-23-3, SOT-343, SOT-883, 4-TSFP). Circuit board redesign is required for any substitution.

Frequently Asked Questions (FAQ)

Q: Can the BFR360L3E6765XTMA1 directly replace the MRF426 in a 35V/3A application?

A: No. The BFR360L3E6765XTMA1 is rated for 9V maximum collector-emitter breakdown voltage and 35mA maximum collector current. It cannot operate at the MRF426's 35V/3A specification. This part is suitable only for applications redesigned for 9V operation with reduced current requirements.

Q: Which substitute part maintains the highest voltage rating?

A: The KST10MTF (onsemi) provides the highest voltage rating among substitutes at 25V maximum collector-emitter breakdown voltage. This remains 10V below the MRF426's 35V specification.

Q: Are all substitute parts surface mount devices?

A: Yes. All listed substitute parts employ surface mount packaging (SOT-23-3, SOT-343, SOT-883, or 4-TSFP). The original MRF426 uses chassis mount configuration (211-07 style). Circuit board layout and assembly process modifications are required for any substitution.

Q: Do the substitute parts maintain ROHS3 compliance?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, matching the original MRF426 environmental and regulatory specifications.

Q: Which substitute part offers the highest frequency capability?

A: The BFP720FH6327XTSA1 (Infineon) provides the highest transition frequency at 45GHz. However, this part is limited to 4.7V operation and 25mA maximum collector current, making it suitable only for specialized high-frequency, low-power applications.

Q: Can multiple substitute parts be used in parallel to achieve the MRF426's current capability?

A: Parallel operation of the listed substitute parts is not addressed in the provided specifications. Circuit design considerations for parallel transistor operation fall outside the scope of this equivalency reference.

Q: What is the primary limitation when substituting the MRF426?

A: The primary limitation is the significant reduction in both voltage rating and current capability across all listed substitutes. The MRF426 operates at 35V/3A/25W, while substitutes range from 4.7V to 25V with maximum currents of 25mA to 80mA. Application redesign is necessary for any substitution.

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