MMBF5484 Equivalent & Substitute Parts

Part Overview

The MMBF5484 is an RF MOSFET JFET N-Channel transistor manufactured by onsemi, rated for 15 V operation at 400 MHz with a 4 dB noise figure in a SOT-23-3 surface mount package. This device is classified as Active product status and is RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining the same package form factor and mounting technology. The MMBF5484 operates in RF applications requiring low noise performance and specific frequency characteristics. Alternative devices may be selected based on voltage rating compatibility, current handling capacity, and package standardization across the SOT-23-3 family.

Substiute Parts

MMBF5484

onsemiIn Stock: 19348MMBF5484 Datasheet

Current PartRFQ

MMBFJ309LT1G

onsemiIn Stock: 17826MMBFJ309LT1G 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 MMBF5484 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain functional equivalence through matching or exceeding the following critical parameters:

• N-Channel JFET configuration
• SOT-23-3 surface mount package
• Voltage-rated operation at 25 V or higher
• Active product status
• RoHS3 compliance and MSL 1 rating

Similar Substitutes provide functional alternatives with variations in specific performance characteristics such as voltage test rating, current capacity, or gain specifications, while maintaining package compatibility and core JFET technology.

The substitution logic prioritizes package standardization (SOT-23-3), mounting technology (surface mount), and compliance certifications (RoHS3, REACH Unaffected) as primary selection criteria. Secondary parameters including current rating, voltage test specifications, and gain characteristics determine the degree of functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full RoHS3 compliance with MSL 1 (Unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the MMBF5484.

MMBFJ309LT1G, MMBFJ310LT3G, and MMBFU310LT1G are Direct Substitutes classified by onsemi as equivalent alternatives. These devices share identical SOT-23-3 packaging, N-Channel JFET configuration, and 25 V voltage rating. Current handling capacity ranges from 24 mA to 60 mA, exceeding the MMBF5484 specification of 5 mA. These parts are suitable for applications where the primary requirement is RF JFET functionality within the specified voltage envelope.

SMMBFJ310LT3G is a Direct Substitute with AEC-Q101 automotive qualification. This device is electrically equivalent to MMBFJ310LT3G and carries automotive-grade certification, making it appropriate for applications requiring automotive-level reliability and traceability.

CPH3910-TL-E is a Similar Substitute with a 3-CPH package variant while maintaining SOT-23-3 dimensional compatibility. This device provides 50 mA maximum drain current and 400 mW power dissipation, offering enhanced current handling for applications requiring higher power delivery.

SMMBF4393LT1G is a Similar Substitute with a 30 V voltage rating and AEC-Q101 automotive qualification. This device provides increased voltage headroom and is suitable for applications requiring higher voltage tolerance with automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can MMBFJ310LT3G directly replace MMBF5484 in all applications?

A: MMBFJ310LT3G shares the same SOT-23-3 package, N-Channel JFET configuration, and 25 V voltage rating as MMBF5484. The primary difference is the voltage test specification (10 V versus 15 V) and current capacity (60 mA versus 5 mA). Direct replacement is valid for applications where the lower voltage test rating and higher current capacity do not conflict with circuit requirements.

Q: What is the difference between Direct Substitutes and Similar Substitutes?

A: Direct Substitutes are classified by onsemi as equivalent alternatives with matching electrical performance within specified parameters. Similar Substitutes provide functional alternatives with variations in voltage rating, current capacity, or package designation while maintaining core JFET technology and SOT-23-3 compatibility.

Q: Are automotive-grade variants (SMMBFJ310LT3G, SMMBF4393LT1G) compatible with non-automotive applications?

A: Automotive-grade devices with AEC-Q101 qualification exceed the reliability and traceability requirements of standard industrial applications. These parts are fully compatible with non-automotive circuits and provide enhanced quality assurance.

Q: Does package designation affect physical compatibility?

A: All listed substitute parts utilize SOT-23-3 surface mount packaging with identical pin configuration (TO-236-3, SC-59). CPH3910-TL-E uses a 3-CPH supplier package designation but maintains SOT-23-3 dimensional and electrical compatibility. Physical board layout compatibility is assured across all listed substitutes.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are RoHS3 compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. SMMBFJ310LT3G and SMMBF4393LT1G additionally carry AEC-Q101 automotive qualification. All parts maintain Active product status with onsemi.

Q: How does current rating affect substitution suitability?

A: The MMBF5484 specifies 5 mA current rating. All substitute parts exceed this specification, ranging from 24 mA to 60 mA. Higher current capacity does not prevent substitution; however, circuit design must account for the device's actual current handling characteristics to avoid exceeding component ratings in the application.

Q: Is frequency specification critical for substitution?

A: The MMBF5484 specifies 400 MHz operation. Substitute parts do not list frequency specifications in the provided data. Frequency compatibility must be verified through detailed device datasheets and application circuit analysis to ensure RF performance requirements are met.