MMBF5457 Equivalent & Substitute Parts

Part Overview

The MMBF5457 is an N-Channel JFET transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This device operates at a maximum breakdown voltage of 25 V with a maximum power dissipation of 350 mW and is rated for operating temperatures from -55°C to 150°C. The part is currently in active production status and carries ROHS3 compliance with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that allow direct functional replacement in circuit designs.

Substiute Parts

MMBF5457

onsemiIn Stock: 35508MMBF5457 Datasheet

Current PartRFQ

MMBFJ309LT1G

onsemiIn Stock: 17826MMBFJ309LT1G Datasheet

DirectRFQ

MMBFJ310LT1G

onsemiIn Stock: 33865MMBFJ310LT1G Datasheet

DirectRFQ

MMBFJ310LT3G

onsemiIn Stock: 9302MMBFJ310LT3G Datasheet

DirectRFQ

MMBFU310LT1G

onsemiIn Stock: 28463MMBFU310LT1G Datasheet

DirectRFQ

SMMBFJ310LT3G

onsemiIn Stock: 26754SMMBFJ310LT3G Datasheet

DirectRFQ

CPH3910-TL-E

onsemiIn Stock: 17965CPH3910-TL-E Datasheet

SimilarRFQ

SMMBF4393LT1G

onsemiIn Stock: 45414SMMBF4393LT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MMBF5457 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Electrical Equivalents): Parts that share identical or compatible voltage ratings (25 V breakdown), N-Channel configuration, SOT-23-3 package, and surface mount technology. These parts maintain functional equivalence for circuit applications requiring the same electrical performance envelope.

Similar Substitutes (Functional Alternatives): Parts that operate within the same voltage class and package family but may have different current ratings, power dissipation, or specialized characteristics (such as automotive qualification). These parts are suitable for applications where the specific electrical parameters of the MMBF5457 are not critical constraints.

Key parameters determining substitution eligibility:

• Voltage - Breakdown (V(BR)GSS): 25 V or higher
• Configuration: N-Channel JFET
• Package: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C or compatible subset

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are manufactured by onsemi and maintain active product status with ROHS3 compliance and MSL 1 rating, ensuring availability and environmental regulatory alignment with the MMBF5457.

For Direct Replacement: MMBFJ309LT1G, MMBFJ310LT1G, MMBFJ310LT3G, and MMBFU310LT1G are N-Channel JFET devices in SOT-23-3 packages with 25 V voltage ratings. These parts share the same mechanical footprint and voltage class as the MMBF5457, making them suitable for applications requiring equivalent electrical performance.

For Automotive Applications: SMMBFJ310LT3G and SMMBF4393LT1G carry AEC-Q101 automotive qualification, appropriate for designs requiring automotive-grade component certification.

For Higher Voltage Margin: SMMBF4393LT1G provides a 30 V breakdown voltage rating, offering additional voltage headroom compared to the 25 V MMBF5457, suitable for applications with elevated voltage stress requirements.

For Higher Power Dissipation: CPH3910-TL-E supports 400 mW maximum power dissipation, exceeding the MMBF5457's 350 mW rating, and accommodates higher drain current (50 mA maximum) for applications requiring increased power handling capability.

Frequently Asked Questions (FAQ)

Q: Can MMBFJ310LT1G and MMBFJ310LT3G be used interchangeably with MMBF5457?

A: Both parts share identical voltage ratings (25 V), N-Channel JFET configuration, and SOT-23-3 package. The primary difference is packaging format: MMBFJ310LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while MMBFJ310LT3G is supplied in Tape & Reel (TR) format. Electrical performance is equivalent; selection depends on procurement and assembly requirements.

Q: What is the difference between MMBFU310LT1G and MMBFJ310LT1G?

A: Both are N-Channel JFETs in SOT-23-3 packages with 25 V ratings. MMBFU310LT1G exhibits higher drain current (24 mA @ 10 V) and lower power dissipation (225 mW) compared to MMBFJ310LT1G. Selection depends on specific circuit current and power requirements.

Q: Is SMMBF4393LT1G a direct substitute for MMBF5457?

A: SMMBF4393LT1G operates at 30 V breakdown voltage, exceeding the MMBF5457's 25 V rating. While both are N-Channel JFETs in SOT-23-3 packages, the higher voltage rating makes SMMBF4393LT1G suitable for applications requiring additional voltage margin. It is not a direct one-to-one replacement but a functional alternative for designs tolerating higher voltage specifications.

Q: Can CPH3910-TL-E replace MMBF5457 in all applications?

A: CPH3910-TL-E shares the 25 V voltage rating and SOT-23-3 package with MMBF5457 but features higher maximum drain current (50 mA) and power dissipation (400 mW). It is suitable for applications requiring higher current handling. Verify circuit design compatibility with the different electrical characteristics before substitution.

Q: What does the "S" prefix in SMMBFJ310LT3G and SMMBF4393LT1G indicate?

A: The "S" prefix denotes automotive-grade qualification (AEC-Q101). These parts meet automotive industry standards and are appropriate for automotive applications. Standard MMBF and MMBFJ series parts without the "S" prefix are general-purpose industrial grade.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity level, matching the environmental and regulatory status of the MMBF5457.