BF545C,215 Equivalent & Substitute Parts Reference

Part Overview

The BF545C,215 is an N-Channel JFET RF transistor manufactured by NXP USA Inc., housed in a SOT-23 (TO-236AB) surface mount package. This component is rated for 30V operation with a maximum drain current of 25mA and is designed for RF applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

BF545C,215

NXP USA Inc.In Stock: 1256BF545C,215 Datasheet

Current PartRFQ

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 BF545C,215 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Technology: N-Channel JFET
• Package: SOT-23-3 (TO-236-3, SC-59) surface mount
• Voltage Rating: Minimum 30V drain-source voltage (Vdss)
• Current Capability: Minimum 25mA drain current (Id)
• Mounting: Surface mount configuration
• Compliance: ROHS3 compliant, MSL 1 rating

Substitute Parts Identified:

1. CPH3910-TL-E (onsemi): N-Channel JFET, 25V Vdss, 50mA Id max, SOT-23-3 package. Voltage rating is 5V below the main part; current capability exceeds requirement.

2. MMBF4416A (onsemi): N-Channel JFET, 35V Vdss, 15mA Id max, SOT-23-3 package. Voltage rating exceeds requirement; current capability is below the main part specification.

3. SMMBF4393LT1G (onsemi): N-Channel JFET, 30V Vdss, 30mA Idss, SOT-23-3 package. Voltage and current ratings match or exceed the main part; includes automotive qualification (AEC-Q101).

Parameter Comparison

Engineering Selection Recommendations

SMMBF4393LT1G is the primary substitute for the BF545C,215. This part matches the rated voltage specification (30V Vdss) and exceeds the current requirement (30mA Idss vs. 25mA). All three substitute parts maintain ROHS3 compliance and MSL 1 rating. SMMBF4393LT1G includes AEC-Q101 automotive qualification, providing additional reliability assurance for applications requiring extended temperature operation (-55°C to 150°C).

CPH3910-TL-E is suitable for applications where the 25V voltage rating is acceptable and higher current capability (50mA) is beneficial. This part operates at a maximum junction temperature of 150°C.

MMBF4416A is applicable only in circuits where the 15mA current requirement is sufficient. The 35V voltage rating provides margin above the 30V specification. This part is not recommended for designs requiring the full 25mA current specification of the original BF545C,215.

All substitute parts are active products with established supply chains, eliminating obsolescence risk associated with the original part.

Frequently Asked Questions (FAQ)

Q: Can CPH3910-TL-E replace BF545C,215 in all applications?

A: CPH3910-TL-E has a 25V Vdss rating, which is 5V below the BF545C,215 specification. It is suitable only for circuits operating at or below 25V. The higher current capability (50mA) does not compensate for the reduced voltage margin.

Q: What is the key difference between MMBF4416A and SMMBF4393LT1G?

A: MMBF4416A is rated for 15mA maximum drain current, which is below the BF545C,215 requirement of 25mA. SMMBF4393LT1G is rated for 30mA Idss and matches the 30V voltage specification. SMMBF4393LT1G is the preferred substitute.

Q: Are all substitute parts in the same package?

A: Yes. BF545C,215 and all three substitute parts use the SOT-23-3 (TO-236-3, SC-59) surface mount package. PCB layout and footprints are compatible without modification.

Q: Does SMMBF4393LT1G automotive qualification affect non-automotive applications?

A: No. AEC-Q101 qualification indicates additional testing and reliability assurance. This certification does not restrict use in non-automotive applications and provides enhanced reliability margins.

Q: What is the moisture sensitivity level (MSL) for all parts?

A: All parts, including the original BF545C,215 and all substitutes, carry MSL 1 (Unlimited) rating. No special moisture control measures are required during storage or handling.

Q: Are there any frequency or gain specifications that differ between these parts?

A: Frequency and gain specifications are not provided for BF545C,215, CPH3910-TL-E, or SMMBF4393LT1G. MMBF4416A specifies 400MHz operation and 4dB noise figure. Frequency response characteristics must be evaluated based on application requirements.

Q: What is the REACH and ECCN status for substitute parts?

A: All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, consistent with the original BF545C,215. No additional export or compliance documentation is required.