MMBFJ175 Equivalent & Substitute Parts

Part Overview

The MMBFJ175 is a P-Channel JFET transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum breakdown voltage of 30 V with a power dissipation rating of 225 mW and an on-resistance of 125 Ohms. The MMBFJ175 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Substiute Parts

MMBFJ175

onsemiIn Stock: 1658MMBFJ175 Datasheet

Current PartRFQ

MMBFJ175LT1G

onsemiIn Stock: 65382MMBFJ175LT1G Datasheet

DirectRFQ

MMBFJ175LT3G

onsemiIn Stock: 10110MMBFJ175LT3G Datasheet

SimilarRFQ

CMPFJ175 TR

Central Semiconductor CorpIn Stock: 9302CMPFJ175 TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBFJ175 is determined by strict equivalence across the following electrical and mechanical parameters:

• FET Type: P-Channel configuration
• Voltage - Breakdown (V(BR)GSS): 30 V minimum
• Current - Drain (Idss) @ Vds (Vgs=0): 7 mA @ 15 V
• Voltage - Cutoff (VGS off) @ Id: 3 V @ 10 nA
• Resistance - RDS(On): 125 Ohms
• Package / Case: SOT-23-3 surface mount
• Operating Temperature Range: -55°C to 150°C minimum

Substitute parts are grouped into two categories: direct manufacturer equivalents from onsemi with identical electrical specifications and active product status, and cross-manufacturer alternatives that maintain electrical parameter compatibility while offering different packaging or compliance profiles.

Parameter Comparison

Engineering Selection Recommendations

MMBFJ175LT1G and MMBFJ175LT3G are direct onsemi equivalents with active product status and identical electrical specifications. Both maintain ROHS3 compliance and are suitable for applications requiring regulatory adherence. Selection between these two depends on procurement packaging requirements: MMBFJ175LT1G is available in Cut Tape and Digi-Reel formats, while MMBFJ175LT3G is supplied in Tape & Reel configuration.

CMPFJ175 TR from Central Semiconductor Corp maintains electrical parameter equivalence and offers increased power dissipation capability at 350 mW compared to the 225 mW rating of the MMBFJ175. This part extends the operating temperature range to -65°C minimum. However, CMPFJ175 TR is RoHS non-compliant and should be selected only when regulatory compliance is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can MMBFJ175LT1G and MMBFJ175LT3G be used interchangeably with the obsolete MMBFJ175?

A: Yes. Both parts are onsemi direct equivalents with identical electrical specifications, including breakdown voltage, drain current, cutoff voltage, on-resistance, and power rating. The difference is packaging format: MMBFJ175LT1G uses Cut Tape and Digi-Reel, while MMBFJ175LT3G uses Tape & Reel. Electrical performance is identical.

Q: What is the primary difference between onsemi and Central Semiconductor Corp substitutes?

A: The onsemi parts (MMBFJ175LT1G and MMBFJ175LT3G) are ROHS3 compliant with 225 mW power rating. The CMPFJ175 TR from Central Semiconductor Corp offers 350 mW power dissipation and extended low-temperature operation to -65°C, but is RoHS non-compliant. Electrical parameters remain equivalent across all three substitutes.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All substitute parts use the SOT-23-3 surface mount package, ensuring mechanical and electrical compatibility with existing PCB designs. Pin configuration and footprint are identical.

Q: Which substitute should be selected for new designs?

A: For new designs requiring regulatory compliance, select MMBFJ175LT1G or MMBFJ175LT3G based on procurement packaging preference. Both maintain active product status and ROHS3 compliance. CMPFJ175 TR should be reserved for applications where RoHS compliance is not required and the additional 125 mW power headroom provides design benefit.

Q: Is the increased power rating of CMPFJ175 TR a functional advantage?

A: The 350 mW rating of CMPFJ175 TR provides additional thermal margin compared to the 225 mW rating of onsemi equivalents. This is a design advantage only if the application requires higher power dissipation. For circuits designed to the 225 mW specification, all three substitutes perform identically.