BFM520,115 Equivalent & Substitute Parts

Part Overview

The BFM520,115 is a dual NPN RF transistor manufactured by NXP USA Inc., designed for high-frequency applications up to 9GHz with a maximum power rating of 1W. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part is available in 6-TSSOP surface mount packaging and maintains full RoHS3 compliance with unlimited moisture sensitivity rating.

Key Parameters

Parameter	BFM520,115
Transistor Type	2 NPN (Dual)
Voltage - Collector Emitter Breakdown (Max)	8V
Frequency - Transition	9GHz
Noise Figure (dB Typ @ f)	1.2dB ~ 2.1dB @ 900MHz
Power - Max	1W
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 20mA, 6V
Current - Collector (Ic) (Max)	70mA
Operating Temperature	175°C (TJ)
Package / Case	6-TSSOP, SC-88, SOT-363
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BFM520,115 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor configuration: Dual NPN (2 NPN) topology
Package type: 6-TSSOP surface mount (SC-88, SOT-363)
Frequency capability: Minimum 9GHz transition frequency
Voltage rating: Minimum 8V collector-emitter breakdown voltage
Current handling: Minimum 70mA collector current capacity
Power dissipation: Minimum 1W capability
Compliance: RoHS3 compliant

The BFU520YX qualifies as a direct substitute based on these parameters. While the BFU520YX exhibits enhanced electrical specifications (12V breakdown voltage, 10GHz frequency, 450mW power rating), it maintains full compatibility with the 6-TSSOP package footprint and exceeds all minimum performance requirements of the original BFM520,115.

Parameter Comparison

Parameter	BFM520,115	BFU520YX	Compatibility
Transistor Type	2 NPN (Dual)	2 NPN (Dual)	Identical
Voltage - Collector Emitter Breakdown (Max)	8V	12V	BFU520YX exceeds requirement
Frequency - Transition	9GHz	10GHz	BFU520YX exceeds requirement
Noise Figure (dB Typ @ f)	1.2dB ~ 2.1dB @ 900MHz	0.65dB @ 900MHz	BFU520YX superior performance
Power - Max	1W	450mW	BFM520,115 exceeds requirement
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 20mA, 6V	60 @ 5mA, 8V	Equivalent gain, different test conditions
Current - Collector (Ic) (Max)	70mA	30mA	BFM520,115 exceeds requirement
Package / Case	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	Identical
Product Status	Obsolete	Active	BFU520YX actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

Primary Substitute: BFU520YX

The BFU520YX is the manufacturer-recommended substitute for the obsolete BFM520,115. Selection of the BFU520YX is supported by the following factors:

Product Status: The BFU520YX maintains active production status with NXP USA Inc., ensuring long-term availability and supply chain continuity.
Compliance and Certification: Both components maintain ROHS3 compliance and identical regulatory status (EAR99, REACH Unaffected). The BFU520YX carries AEC-Q101 automotive qualification, providing additional reliability assurance for demanding applications.
Package Compatibility: Identical 6-TSSOP surface mount packaging ensures direct PCB footprint compatibility without layout modifications.
Electrical Performance: The BFU520YX meets or exceeds all critical electrical parameters of the BFM520,115, including voltage rating (12V vs. 8V), frequency capability (10GHz vs. 9GHz), and noise figure (0.65dB vs. 1.2dB~2.1dB).
Current Handling Trade-off: The BFU520YX specifies a lower maximum collector current (30mA vs. 70mA). Circuit designs operating at collector currents exceeding 30mA require detailed analysis to confirm compatibility with the substitute part's current rating.

Frequently Asked Questions (FAQ)

Q: Can the BFU520YX be used as a direct replacement for BFM520,115 in existing designs?

A: The BFU520YX is electrically compatible with the BFM520,115 for applications operating within the BFU520YX's specified current limits (30mA maximum). The identical 6-TSSOP package permits direct PCB substitution without layout changes. Designs requiring collector currents exceeding 30mA require circuit re-evaluation.

Q: What is the primary difference between BFM520,115 and BFU520YX?

A: The BFU520YX provides enhanced voltage rating (12V vs. 8V), higher frequency capability (10GHz vs. 9GHz), and superior noise figure (0.65dB vs. 1.2dB~2.1dB). The BFM520,115 offers higher maximum collector current (70mA vs. 30mA) and power dissipation (1W vs. 450mW). The BFU520YX is actively manufactured while the BFM520,115 is obsolete.

Q: Are there packaging differences between these parts?

A: Both components use identical 6-TSSOP surface mount packaging (also designated SC-88 or SOT-363). No PCB layout modifications are required for substitution.

Q: Does the BFU520YX carry automotive qualification?

A: Yes, the BFU520YX is qualified to AEC-Q101 automotive standards, providing enhanced reliability documentation for applications requiring automotive-grade components.

Q: What is the operating temperature range difference?

A: The BFM520,115 specifies a maximum junction temperature of 175°C. The BFU520YX specifies an operating temperature range of -40°C to 150°C (TJ), indicating a lower maximum junction temperature. Thermal design analysis is required for high-temperature applications.

Q: Is the BFU520YX available in the same packaging options as BFM520,115?

A: The BFU520YX is supplied in Cut Tape (CT) and Digi-Reel® packaging formats. Both components are available in 6-TSSOP surface mount configuration.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message