BF1101WR,115 RF MOSFET Equivalent & Substitute Parts

Part Overview

The BF1101WR,115 is an RF MOSFET manufactured by NXP USA Inc., designed for RF applications operating at 800MHz with a 5V test voltage rating. This component is classified as an N-Channel Dual Gate MOSFET in a surface mount SC-82A/SOT-343 package (CMPAK-4 supplier designation).

The BF1101WR,115 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this RF MOSFET.

Substiute Parts

BF1101WR,115

NXP USA Inc.In Stock: 771BF1101WR,115 Datasheet

Current PartRFQ

3SK293(TE85L,F)

Toshiba Semiconductor and StorageIn Stock: 421223SK293(TE85L,F) Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BF1101WR,115 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Technology type: MOSFET
• Configuration: N-Channel Dual Gate
• Operating frequency: 800MHz
• Voltage rating: Test voltage and rated voltage must meet or exceed the original specification
• Current rating: Must support minimum 30mA
• Noise figure: Lower or equivalent values ensure signal integrity

Mechanical Compatibility Criteria:

• Package type: SC-82A/SOT-343 surface mount package
• Mounting type: Surface mount
• Pin configuration: Must maintain electrical equivalence

Compliance Criteria:

• RoHS3 compliance required
• MSL rating of 1 (Unlimited) acceptable
• REACH unaffected status maintained

The substitute part 3SK293(TE85L,F) manufactured by Toshiba Semiconductor and Storage meets all critical substitution parameters within the allowed electrical and mechanical specifications for this RF MOSFET category.

Parameter Comparison

Engineering Selection Recommendations

The 3SK293(TE85L,F) from Toshiba Semiconductor and Storage is a direct substitute for the obsolete BF1101WR,115 based on the following engineering criteria:

Electrical Equivalence: The substitute part maintains identical technology (MOSFET), configuration (N-Channel Dual Gate), and operating frequency (800MHz). Voltage ratings of the substitute exceed the original specification, providing enhanced margin. Current ratings are identical at 30mA. The noise figure of the substitute (2.5dB) is higher than the original (1.7dB) but remains within acceptable RF performance parameters for this component category.

Mechanical Compatibility: Both parts utilize the SC-82A/SOT-343 surface mount package with identical pin configurations, enabling direct PCB layout compatibility without redesign.

Compliance and Supply Status: The substitute part maintains ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring regulatory alignment. The substitute is currently in active production status with substantial inventory availability (42,100 pieces), addressing the supply discontinuation of the obsolete original part.

Substitution Validity: The 3SK293(TE85L,F) is suitable for direct replacement in applications where the BF1101WR,115 was originally specified, provided circuit design accommodates the slightly elevated noise figure characteristic.

Frequently Asked Questions (FAQ)

Q: Can the 3SK293(TE85L,F) be used as a direct replacement for the BF1101WR,115 without PCB modifications?

A: Yes. Both parts share identical package types (SC-82A/SOT-343) and surface mount configurations. Pin-to-pin compatibility is maintained, eliminating the need for PCB layout changes.

Q: What is the significance of the voltage rating difference between the original and substitute parts?

A: The substitute part (3SK293) has a rated voltage of 12.5V compared to the original 7V. This higher rating provides additional design margin and does not create compatibility issues. The test voltage of 6V for the substitute exceeds the original 5V specification, confirming adequate electrical performance headroom.

Q: How does the noise figure difference affect circuit performance?

A: The substitute part exhibits a noise figure of 2.5dB versus the original 1.7dB. This 0.8dB increase represents a measurable but modest elevation in noise performance. Circuit designers must evaluate whether this noise figure increase is acceptable within the system's signal-to-noise ratio requirements.

Q: Are there compliance or regulatory concerns with substituting this part?

A: No. Both the original and substitute parts maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and REACH unaffected status. Regulatory and environmental compliance requirements are satisfied by the substitute part.

Q: What is the current availability status of each part?

A: The BF1101WR,115 is obsolete with limited remaining inventory (740 pieces). The 3SK293(TE85L,F) is in active production with substantial availability (42,100 pieces), ensuring reliable long-term supply for new designs or production continuity.

Q: Are there any frequency or gain considerations for this substitution?

A: Both parts operate at 800MHz, maintaining frequency compatibility. The substitute part specifies a gain of 22dB, whereas the original part does not provide gain specification. This additional performance data for the substitute may be beneficial for circuit analysis and optimization.