BF545B,215 Equivalent & Substitute Parts Reference

Part Overview

The BF545B,215 is an RF MOSFET JFET N-Channel device manufactured by NXP USA Inc., housed in a SOT-23 (TO-236AB) surface mount package. This component is rated for 30 V operation with a maximum drain current of 15 mA and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

BF545B,215

NXP USA Inc.In Stock: 1137BF545B,215 Datasheet

Current PartRFQ

2SK932-23-TB-E

onsemiIn Stock: 67002SK932-23-TB-E Datasheet

MFR RecommendedRFQ

CPH3910-TL-E

onsemiIn Stock: 17965CPH3910-TL-E Datasheet

MFR RecommendedRFQ

MMBF4416A

onsemiIn Stock: 6439MMBF4416A Datasheet

MFR RecommendedRFQ

SMMBF4393LT1G

onsemiIn Stock: 45414SMMBF4393LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BF545B,215 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Technology: N-Channel JFET
• Package: TO-236-3 / SOT-23-3 surface mount configuration
• Voltage Rating: Minimum 30 V drain-to-source voltage (Vdss)
• Current Capability: Minimum 15 mA drain current (Id)
• RoHS3 Compliance and MSL Level 1 rating

Substitution Logic: All four substitute parts maintain N-Channel JFET topology and SOT-23-3 package compatibility. Substitutes are grouped by their ability to meet or exceed the voltage and current specifications of the original BF545B,215. Parts with higher voltage ratings (35 V, 50 V, or 25 V) and equal or greater current ratings (50 mA) are electrically compatible. The SMMBF4393LT1G provides exact voltage matching (30 V) with enhanced current capability and automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

SMMBF4393LT1G (Primary Substitute) This part provides exact voltage rating matching (30 V Vdss) with doubled current capability (30 mA vs. 15 mA). It carries AEC-Q101 automotive qualification and extended operating temperature range (-55°C to 150°C), making it suitable for both commercial and automotive applications. All compliance certifications (ROHS3, MSL 1) align with the original part.

MMBF4416A (Electrical Equivalent) Offers identical current rating (15 mA) and higher voltage rating (35 V). Maintains all compliance requirements and active product status. Suitable for direct pin-compatible replacement in applications not requiring automotive qualification.

CPH3910-TL-E (Higher Power Alternative) Provides 25 V voltage rating with 50 mA current capability and 400 mW power dissipation. Appropriate for designs requiring increased current headroom while maintaining voltage compatibility within acceptable margins.

2SK932-23-TB-E (Lower Voltage Alternative) Rated at 15 V with 50 mA current capability. Suitable only for applications where the 30 V voltage specification can be reduced to 15 V without circuit performance degradation.

All substitute parts maintain SOT-23-3 package compatibility, surface mount configuration, and ROHS3 compliance. Selection should be based on specific circuit voltage and current requirements.

Frequently Asked Questions (FAQ)

Q: Can the BF545B,215 be directly replaced with any of these substitutes? A: Direct replacement depends on circuit voltage and current requirements. SMMBF4393LT1G and MMBF4416A are pin-compatible with identical or higher voltage ratings. CPH3910-TL-E operates at 25 V (lower than 30 V specification). 2SK932-23-TB-E operates at 15 V and is suitable only if circuit design permits voltage reduction.

Q: What is the primary reason for substitution? A: The BF545B,215 is classified as obsolete. All substitute parts are active products from onsemi, ensuring long-term availability and supply chain continuity.

Q: Are all substitutes in the same package? A: Yes. All substitute parts use TO-236-3 / SOT-23-3 surface mount packages, enabling direct PCB footprint compatibility without layout modifications.

Q: Do the substitutes meet the same compliance standards? A: All substitute parts are ROHS3 compliant with MSL Level 1 rating, matching the original BF545B,215 specifications. SMMBF4393LT1G additionally carries AEC-Q101 automotive qualification.

Q: Which substitute offers the best performance match? A: SMMBF4393LT1G provides exact voltage rating (30 V) with enhanced current capability (30 mA) and automotive qualification. MMBF4416A offers identical current rating (15 mA) with higher voltage margin (35 V).

Q: Can substitutes be used in RF applications? A: MMBF4416A is specified for RF operation at 400 MHz with 4 dB noise figure. Other substitutes are general-purpose N-Channel JFETs suitable for analog switching and amplification applications.

Q: What are the key electrical differences between substitutes? A: Voltage ratings range from 15 V to 35 V. Current capabilities range from 15 mA to 50 mA. Power dissipation ranges from 200 mW to 400 mW. Selection should match circuit requirements for voltage headroom and current demand.