BFP 405 H6433 Equivalent & Substitute Parts

Part Overview

The BFP 405 H6433 is an RF transistor NPN manufactured by Infineon Technologies, designed for high-frequency applications up to 25GHz with a maximum power dissipation of 75mW. This device operates at 5V collector-emitter breakdown voltage and is packaged in the SC-82A/SOT-343 surface mount configuration.

The BFP 405 H6433 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this RF transistor.

Substiute Parts

BFP 405 H6433

Infineon TechnologiesIn Stock: 749BFP 405 H6433 Datasheet

Current PartRFQ

2SC4713KT146R

Rohm SemiconductorIn Stock: 17872SC4713KT146R Datasheet

MFR RecommendedRFQ

MRF422

MACOM Technology SolutionsIn Stock: 1125MRF422 Datasheet

MFR RecommendedRFQ

NSVMMBTH10LT1G

onsemiIn Stock: 30250NSVMMBTH10LT1G Datasheet

MFR RecommendedRFQ

SMMBTH10-4LT3G

onsemiIn Stock: 1081SMMBTH10-4LT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BFP 405 H6433 is determined by the following critical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN configuration
• Mounting Type: Surface Mount
• Package Compatibility: SOT-343 or equivalent surface mount packages (SOT-23-3, TO-236-3, SC-59)
• Voltage Rating: Collector-Emitter breakdown voltage equal to or greater than 5V
• Frequency Performance: Transition frequency sufficient for intended RF application
• Power Dissipation: Maximum power rating equal to or greater than 75mW
• DC Current Gain (hFE): Minimum gain characteristics suitable for RF amplification
• Maximum Collector Current: Equal to or greater than 25mA

Substitution Logic: The BFP 405 H6433 operates in the high-frequency RF domain (25GHz transition frequency). Substitute parts are selected from active product lines with compatible surface mount packaging and electrical characteristics that meet or exceed the original specifications. Substitutes may operate at lower transition frequencies if the application permits, provided voltage and power ratings are maintained or exceeded.

Parameter Comparison

Engineering Selection Recommendations

For Direct Surface Mount Substitution (SOT-23-3 / TO-236-3 Package):

NSVMMBTH10LT1G and SMMBTH10-4LT3G are active product alternatives from onsemi with surface mount SOT-23-3 packaging compatible with the BFP 405 H6433 footprint. Both devices are ROHS3 compliant and maintain MSL 1 rating. SMMBTH10-4LT3G provides higher DC current gain (120 vs. 60) and operates at 800MHz transition frequency. NSVMMBTH10LT1G operates at 650MHz with equivalent DC current gain to the original part. Both support the 25V voltage rating, exceeding the original 5V specification, and provide 225mW power dissipation, exceeding the original 75mW.

For Lower Frequency RF Applications:

2SC4713KT146R from Rohm Semiconductor is an active product with 800MHz transition frequency, suitable for applications not requiring the original 25GHz performance. This device operates at 6V breakdown voltage and provides 200mW power dissipation with higher DC current gain (180). Packaging is SMT3 (SOT-23-3 equivalent), supporting surface mount integration.

For High-Power Chassis Mount Applications:

MRF422 from MACOM Technology Solutions is a chassis mount device rated for 150W power dissipation and 35V breakdown voltage. This part is suitable only for applications requiring significantly higher power handling and is not a direct form-factor substitute due to its 211-11 package configuration.

Compliance Status:

All active substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can NSVMMBTH10LT1G or SMMBTH10-4LT3G be used as direct replacements for BFP 405 H6433 in existing PCB designs?

A: Both onsemi devices use SOT-23-3 (TO-236-3) packaging, which is mechanically and electrically compatible with the BFP 405 H6433 SOT-343 footprint for surface mount applications. Pin configuration and electrical characteristics support direct substitution in most RF circuit topologies. Verification of circuit performance at the lower transition frequencies (650MHz and 800MHz respectively) is required for applications originally designed for 25GHz operation.

Q: What is the primary difference between NSVMMBTH10LT1G and SMMBTH10-4LT3G?

A: Both devices are onsemi RF transistors in SOT-23-3 packaging with 25V breakdown voltage and 225mW power dissipation. SMMBTH10-4LT3G operates at 800MHz transition frequency with DC current gain of 120 @ 4mA, 10V. NSVMMBTH10LT1G operates at 650MHz transition frequency with DC current gain of 60 @ 4mA, 10V. Selection depends on frequency requirements and desired gain characteristics for the specific application.

Q: Is 2SC4713KT146R suitable for high-frequency RF applications?

A: 2SC4713KT146R operates at 800MHz transition frequency, which is significantly lower than the original BFP 405 H6433 (25GHz). This device is suitable for RF applications in the UHF band and lower frequency ranges. Applications requiring GHz-level performance should use NSVMMBTH10LT1G or SMMBTH10-4LT3G instead.

Q: Can MRF422 replace BFP 405 H6433 in surface mount designs?

A: No. MRF422 uses a 211-11 chassis mount package, which is not compatible with surface mount PCB designs. This device is intended for high-power RF amplification applications requiring 150W dissipation and is not a form-factor substitute for the BFP 405 H6433.

Q: What are the voltage rating implications when substituting with higher-rated devices?

A: Substitute parts with higher voltage ratings (6V, 25V, 35V) are electrically compatible with circuits designed for 5V operation. The higher voltage rating provides additional design margin and does not create incompatibility. Circuit biasing and impedance matching should be verified to ensure optimal performance at the intended operating point.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (2SC4713KT146R, NSVMMBTH10LT1G, SMMBTH10-4LT3G, and MRF422) are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the inventory status of substitute parts?

A: NSVMMBTH10LT1G has the highest inventory availability (30,200 pcs). SMMBTH10-4LT3G has 994 pcs available. 2SC4713KT146R has 1,745 pcs available. MRF422 has 1,110 pcs available. All parts are listed as new original stock.