MRF313 Equivalent & Substitute Parts

Part Overview

The MRF313 is an RF transistor manufactured by MACOM Technology Solutions, classified as a Bipolar Junction Transistor (BJT) with NPN polarity. This component is designed for RF applications requiring 30V collector-emitter breakdown voltage, 150mA maximum collector current, and 1W power dissipation at 2.5GHz transition frequency. The device is housed in a 305A-01 chassis mount package and maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified to provide design flexibility for applications where the MRF313 may be unavailable, discontinued, or where alternative packaging or performance characteristics are required.

Substiute Parts

MRF313

MACOM Technology SolutionsIn Stock: 848MRF313 Datasheet

Current PartRFQ

BFP405H6327XTSA1

Infineon TechnologiesIn Stock: 40407BFP405H6327XTSA1 Datasheet

MFR RecommendedRFQ

BFP843H6327XTSA1

Infineon TechnologiesIn Stock: 7041BFP843H6327XTSA1 Datasheet

MFR RecommendedRFQ

KSP10BU

Fairchild SemiconductorIn Stock: 124127KSP10BU Datasheet

MFR RecommendedRFQ

MMBTH10-4LT1G

onsemiIn Stock: 18418MMBTH10-4LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MRF313 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN polarity required
• Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 30V
• Current - Collector (Ic) (Max): Must equal or exceed 150mA
• Power - Max: Must equal or exceed 1W
• Frequency - Transition: Must support 2.5GHz operation or higher
• DC Current Gain (hFE): Must meet or exceed minimum specification at rated conditions
• RoHS Status: ROHS3 Compliant preferred for regulatory alignment
• Product Status: Active status required for ongoing availability

Secondary Considerations:

• Mounting Type: Chassis Mount preferred; Surface Mount alternatives acceptable with circuit redesign
• Package compatibility: 305A-01 is primary; alternative packages require PCB layout modification

The four substitute parts listed (BFP405H6327XTSA1, BFP843H6327XTSA1, KSP10BU, MMBTH10-4LT1G) are identified based on manufacturer recommendations and meet the core NPN transistor classification. However, each substitute exhibits trade-offs in voltage rating, current capacity, frequency response, power dissipation, and packaging that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

BFP405H6327XTSA1 (Infineon Technologies)

This substitute is suitable for applications where high-frequency performance (25GHz) is prioritized over power handling and current capacity. The 5V voltage rating and 25mA maximum collector current represent significant derating from the MRF313 specification. The 75mW power dissipation is substantially lower than the 1W requirement. Surface mount SOT-343 packaging requires PCB redesign. ROHS3 compliance and Active product status align with regulatory and availability requirements. Selection is appropriate only for low-power, high-frequency RF signal processing applications.

BFP843H6327XTSA1 (Infineon Technologies)

This substitute exhibits the lowest voltage rating (2.25V) and is unsuitable for 30V applications. The 55mA maximum collector current and 125mW power dissipation fall below MRF313 specifications. Surface mount SOT-343 packaging requires PCB modification. ROHS3 compliance and Active status are maintained. This part is not recommended as a direct substitute due to severe electrical parameter derating.

KSP10BU (Fairchild Semiconductor)

This substitute maintains 25V voltage rating, approaching the MRF313 30V specification. The 650MHz transition frequency is significantly lower than 2.5GHz, limiting RF application scope. The 350mW power dissipation is substantially below 1W requirement. Through-hole TO-92-3 packaging allows direct board-level substitution without PCB redesign. RoHS compliance status is not specified. This part is suitable for lower-frequency RF and general-purpose NPN applications where 30V voltage margin is not critical.

MMBTH10-4LT1G (onsemi)

This substitute maintains 25V voltage rating and provides 800MHz transition frequency, supporting moderate RF applications below 2.5GHz. The 225mW power dissipation is below 1W specification. Surface mount SOT-23-3 packaging requires PCB redesign. ROHS3 compliance and Active product status are confirmed. Operating temperature range (-55°C to 150°C) provides extended thermal specification. This part is suitable for surface-mount RF designs operating below 1GHz where power dissipation requirements are reduced.

General Selection Guidance

All substitute parts are classified as Active products with confirmed inventory availability. Selection must prioritize application-specific requirements: voltage rating, current capacity, frequency response, power dissipation, and packaging constraints. No substitute part meets all electrical specifications of the MRF313 simultaneously. Circuit redesign and performance validation are required when implementing any substitute.

Frequently Asked Questions (FAQ)

Q: Can BFP405H6327XTSA1 directly replace MRF313 in a 30V application?

A: No. The BFP405H6327XTSA1 has a maximum collector-emitter breakdown voltage of 5V, which is insufficient for 30V circuit operation. Additionally, the 25mA maximum collector current and 75mW power dissipation are substantially below MRF313 specifications (150mA, 1W). This part is suitable only for low-voltage, high-frequency applications.

Q: What are the packaging implications of substituting MRF313 with surface-mount alternatives?

A: The MRF313 uses a 305A-01 chassis mount package. Substitutes BFP405H6327XTSA1, BFP843H6327XTSA1, and MMBTH10-4LT1G employ surface-mount packages (SOT-343, SOT-23-3) requiring PCB layout redesign, new footprints, and potentially different thermal management approaches. The KSP10BU through-hole TO-92-3 package allows direct board-level substitution without PCB modification.

Q: Which substitute part best maintains the 30V voltage specification?

A: KSP10BU and MMBTH10-4LT1G both maintain 25V maximum collector-emitter breakdown voltage, approaching but not exceeding the MRF313 30V rating. Neither part fully meets the 30V specification. BFP405H6327XTSA1 and BFP843H6327XTSA1 have significantly lower voltage ratings (5V and 2.25V respectively) and are unsuitable for 30V applications.

Q: Can any substitute part handle the full 1W power dissipation of MRF313?

A: No. All substitute parts have power dissipation ratings below 1W: BFP405H6327XTSA1 (75mW), BFP843H6327XTSA1 (125mW), KSP10BU (350mW), and MMBTH10-4LT1G (225mW). Applications requiring 1W power handling cannot use these substitutes without circuit modification to reduce power dissipation requirements.

Q: Which substitute supports the 2.5GHz frequency requirement?

A: BFP405H6327XTSA1 is the only substitute with a transition frequency (25GHz) exceeding 2.5GHz. However, this part has severely reduced voltage, current, and power ratings. KSP10BU (650MHz) and MMBTH10-4LT1G (800MHz) support only lower-frequency RF applications. BFP843H6327XTSA1 does not specify transition frequency.

Q: Are all substitute parts ROHS3 compliant?

A: BFP405H6327XTSA1, BFP843H6327XTSA1, and MMBTH10-4LT1G are confirmed ROHS3 compliant. KSP10BU RoHS compliance status is not specified in the provided data. All parts maintain Active product status with confirmed inventory availability.

Q: What is the primary trade-off when selecting KSP10BU as a substitute?

A: KSP10BU offers the advantage of through-hole TO-92-3 packaging, eliminating PCB redesign requirements. However, the 650MHz transition frequency is significantly below the 2.5GHz MRF313 specification, limiting RF application scope. The 350mW power dissipation is also substantially below 1W requirement. This part is suitable for lower-frequency applications where packaging compatibility is prioritized.

Q: Can MMBTH10-4LT1G be used in high-temperature environments?

A: MMBTH10-4LT1G specifies an operating temperature range of -55°C to 150°C (TJ), providing extended thermal specification. This range supports high-temperature applications. However, the 225mW power dissipation and 800MHz frequency response remain below MRF313 specifications, limiting RF performance in high-power applications.

Q: What is the inventory advantage of selecting KSP10BU?

A: KSP10BU has the highest confirmed inventory (124,035 pieces) compared to MRF313 (764 pieces), BFP405H6327XTSA1 (40,333 pieces), MMBTH10-4LT1G (18,400 pieces), and BFP843H6327XTSA1 (6,992 pieces). This availability advantage may support high-volume production requirements, provided electrical specifications are acceptable for the application.