BFU910FX Equivalent & Substitute Parts Reference

Part Overview

The BFU910FX is an RF transistor NPN manufactured by NXP USA Inc., designed for surface mount applications in the SOT-343F package. This component operates at 9.5V collector-emitter breakdown voltage with a maximum collector current of 15mA and power dissipation of 300mW. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility within RF circuit applications while accommodating the electrical and mechanical constraints of the original design.

Key Parameters

Parameter	BFU910FX Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	9.5	V
Current - Collector (Ic) (Max)	15	mA
Power - Max	300	mW
Gain	13.5	dB
Operating Temperature	-40 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SOT-343F	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BFU910FX is determined by the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown (Max) must equal or exceed 9.5V
Current - Collector (Ic) (Max) must equal or exceed 15mA
Power - Max must equal or exceed 300mW
Operating temperature range must encompass -40°C to 150°C

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package must be compatible with SOT-343F footprint or equivalent surface mount package

Compliance Criteria:

RoHS3 compliance required
MSL rating of 1 (Unlimited) preferred for manufacturing flexibility

The substitute parts identified below meet these criteria with varying degrees of parameter overlap. Parts are grouped by their primary application suitability and parameter alignment with the original BFU910FX specification.

Parameter Comparison

Part Number	Manufacturer	Vce (Max) [V]	Ic (Max) [mA]	Power (Max) [mW]	Gain [dB]	Package	Status
BFU910FX	NXP USA Inc.	9.5	15	300	13.5	SOT-343F	Obsolete
BFU710F,115	NXP USA Inc.	2.8	10	136	—	SOT-343F	Active
2SC4774T106S	Rohm Semiconductor	6	50	200	—	SC-70, SOT-323	Not For New Designs
2SC5226A-4-TL-E	onsemi	10	70	150	12	SC-70, SOT-323	Active
BFP193WH6327XTSA1	Infineon Technologies	12	80	580	13.5–20.5	SC-82A, SOT-343	Active
HFA3102BZ96	Renesas Electronics Corporation	12	30	250	12.4–17.5	14-SOIC	Active
MMBTH10-7-F	Diodes Incorporated	25	50	300	—	SOT-23-3	Active
MRF10031	MACOM Technology Solutions	55	3000	30000	9.5	332A-03	Active
NSVF4020SG4T1G	onsemi	8	150	400	17.5	SC-82FL/MCPH4	Active

Engineering Selection Recommendations

Direct Electrical Substitutes (Recommended for Equivalent Performance):

BFP193WH6327XTSA1 (Infineon Technologies) meets or exceeds all electrical parameters of the BFU910FX. It provides 12V Vce breakdown (exceeds 9.5V requirement), 80mA Ic (exceeds 15mA requirement), and 580mW power dissipation (exceeds 300mW requirement). Gain specification of 13.5–20.5dB encompasses the original 13.5dB. Active product status and ROHS3 compliance ensure long-term availability and regulatory conformance. Package transition from SOT-343F to SC-82A/SOT-343 requires PCB layout verification but maintains surface mount compatibility.

Alternative Substitutes (Application-Dependent Selection):

2SC5226A-4-TL-E (onsemi) provides 10V Vce breakdown and 70mA Ic with 150mW power dissipation. While power rating is below the original specification, this part is suitable for applications where the full 300mW is not required. Active status and ROHS3 compliance are confirmed. Package change to SC-70/SOT-323 requires footprint evaluation.

MMBTH10-7-F (Diodes Incorporated) offers 25V Vce breakdown, 50mA Ic, and 300mW power dissipation matching the original power rating. Extended operating temperature range (-55°C to 150°C) provides additional margin. Active status and ROHS3 compliance confirmed. SOT-23-3 package requires PCB redesign.

NSVF4020SG4T1G (onsemi) provides 8V Vce, 150mA Ic, and 400mW power dissipation with automotive-grade qualification (AEC-Q101). Suitable for applications requiring higher current capability and automotive reliability standards.

Not Recommended for Direct Substitution:

BFU710F,115 exhibits insufficient Vce breakdown (2.8V vs. 9.5V requirement) and reduced Ic (10mA vs. 15mA requirement), making it unsuitable for equivalent replacement.

2SC4774T106S carries "Not For New Designs" status, limiting its use to legacy system maintenance only.

MRF10031 represents a different application class (high-power, chassis-mount RF transistor) and is not suitable for direct substitution in surface mount RF circuits.

HFA3102BZ96 is a multi-transistor array (6 NPN) in 14-SOIC package, requiring significant circuit redesign and not recommended as a direct equivalent.

Frequently Asked Questions (FAQ)

Q: Can BFU710F,115 replace BFU910FX in my circuit?

A: No. BFU710F,115 has a maximum Vce breakdown of 2.8V, which is insufficient for the BFU910FX requirement of 9.5V. Additionally, maximum Ic is 10mA compared to the 15mA requirement. This part does not meet the electrical specifications for equivalent substitution.

Q: What is the primary reason for substituting BFU910FX?

A: BFU910FX is classified as obsolete. Substitute parts ensure design continuity, manufacturing support, and long-term component availability. Active-status alternatives provide equivalent or superior electrical performance with confirmed RoHS3 compliance and extended product lifecycles.

Q: Does package change from SOT-343F to SOT-343 affect compatibility?

A: SOT-343 and SOT-343F are related but distinct packages. While both are surface mount with similar pin configurations, PCB footprint verification is required. Consult package datasheets to confirm mechanical and electrical compatibility before implementation.

Q: Is BFP193WH6327XTSA1 a direct replacement for BFU910FX?

A: BFP193WH6327XTSA1 meets all electrical requirements of BFU910FX with superior performance margins (12V vs. 9.5V Vce, 80mA vs. 15mA Ic, 580mW vs. 300mW power). Package transition from SOT-343F to SC-82A/SOT-343 requires PCB layout verification. Active product status and ROHS3 compliance confirm suitability for new designs.

Q: What is the difference between MSL 1 and MSL 3 ratings?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life without moisture exposure controls. MSL 3 (168 Hours) requires moisture bake-out procedures if the component is exposed to ambient humidity for more than 168 hours. HFA3102BZ96 carries MSL 3 rating, requiring additional handling protocols compared to MSL 1 parts.

Q: Can MMBTH10-7-F be used in high-frequency RF applications?

A: MMBTH10-7-F has a transition frequency of 650MHz, which is significantly lower than BFU910FX (frequency not specified but implied for RF use). This part is suitable for lower-frequency RF and general-purpose switching applications but may not perform adequately in high-frequency RF circuits requiring GHz-range operation.

Q: Why is MRF10031 listed as a substitute if it is not recommended?

A: MRF10031 is included in the original substitute list provided but is not recommended for direct substitution. It represents a different application class (high-power, 3A, 30W, chassis-mount) compared to the low-power surface-mount RF transistor category of BFU910FX. Inclusion reflects the source data; engineering judgment indicates unsuitability for equivalent replacement.

Q: What compliance certifications should I verify before selecting a substitute?

A: Verify RoHS3 compliance for all substitute parts to ensure regulatory conformance with EU and global environmental directives. Confirm MSL rating compatibility with your manufacturing process. For automotive applications, verify AEC-Q101 qualification if required by your design standards. All recommended substitutes in this reference meet ROHS3 compliance.

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