MPF4393RLRPG JFET N-Channel Equivalent & Substitute Parts

Part Overview

The MPF4393RLRPG is a JFET N-Channel transistor rated for 30 V operation with 350 mW power dissipation in a through-hole TO-92 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain functional compatibility through matching electrical characteristics and package compatibility.

Substiute Parts

MPF4393RLRPG

onsemiIn Stock: 937MPF4393RLRPG Datasheet

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J109-D26Z

onsemiIn Stock: 40106J109-D26Z Datasheet

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J112-D74Z

onsemiIn Stock: 65467J112-D74Z Datasheet

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J211-D74Z

onsemiIn Stock: 4793J211-D74Z Datasheet

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MMBF4393LT1G

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MPF4393RLRPG is determined by the following criteria:

Primary Compatibility Criteria:

• FET Type: N-Channel configuration required
• Voltage Rating: Vdss must equal or exceed 30 V
• Current Characteristics: Idss and VGS(off) parameters must support equivalent circuit operation
• On-Resistance: RDS(On) values determine switching performance and power dissipation
• Power Dissipation: Maximum power rating must support application requirements
• Package Type: Through-hole TO-92-3 configuration for direct pin compatibility
• Operating Temperature Range: Must support -65°C ~ 150°C or equivalent range

Substitute Categories:

Category 1: Direct Through-Hole Equivalents (Same Package) Parts maintaining TO-92-3 through-hole packaging with electrical parameters within acceptable tolerance ranges.

Category 2: Surface-Mount Alternatives (Different Package) Parts with equivalent electrical characteristics but in surface-mount packages (SOT-23-3), suitable for redesigned PCB layouts.

Category 3: Enhanced Voltage Rating (Higher Vdss) Parts with Vdss ratings exceeding 30 V, providing additional design margin while maintaining core electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

J112-D74Z (Recommended Primary Substitute)

• Active product status with ROHS3 compliance
• Vdss rating of 35 V exceeds the 30 V requirement, providing design margin
• Idss of 5 mA matches the original specification
• RDS(On) of 50 Ohms is lower than the original 100 Ohms, improving switching efficiency
• Power rating of 625 mW exceeds the 350 mW requirement
• TO-92-3 package provides direct pin compatibility
• Operating temperature range -55°C ~ 150°C covers the critical upper range

MMBF4393LT1G (Surface-Mount Alternative)

• Active product status with ROHS3 compliance
• Electrical parameters identical to MPF4393RLRPG (Vdss 30 V, Idss 5 mA, RDS(On) 100 Ohms)
• SOT-23-3 package requires PCB redesign but offers space efficiency
• Power rating of 225 mW is lower than the original 350 mW; verify application power requirements
• Operating temperature range -55°C ~ 150°C

J109-D26Z (Lower Voltage Alternative)

• Active product status with ROHS3 compliance
• Vdss rating of 25 V is below the 30 V specification; use only if circuit operates below 25 V
• Idss of 40 mA significantly exceeds the original 5 mA; verify circuit compatibility
• RDS(On) of 12 Ohms provides superior switching performance
• Power rating of 625 mW exceeds requirements
• TO-92-3 package provides direct pin compatibility

J211-D74Z (Limited Data Alternative)

• Active product status with ROHS3 compliance
• Vdss rating of 25 V is below the 30 V specification
• Current rating of 20 mA provided; detailed electrical parameters not specified
• TO-92-3 package provides direct pin compatibility
• Use only when detailed parameter matching is not critical

Frequently Asked Questions (FAQ)

Q: Can J112-D74Z directly replace MPF4393RLRPG without circuit modification? A: J112-D74Z is electrically compatible as a direct replacement. The higher Vdss rating (35 V vs. 30 V) and lower RDS(On) (50 Ω vs. 100 Ω) improve performance margins. TO-92-3 package pinout is identical. No circuit modification is required.

Q: Why is MMBF4393LT1G listed as a substitute if it has lower power rating (225 mW vs. 350 mW)? A: MMBF4393LT1G provides electrical equivalence with identical Vdss, Idss, and RDS(On) specifications. The lower power rating is a package limitation of SOT-23-3 versus TO-92-3. Use this part only if application power dissipation remains below 225 mW.

Q: Is J109-D26Z suitable for direct replacement? A: J109-D26Z is not recommended as a direct replacement due to Vdss rating of 25 V, which is below the 30 V specification. Use only if circuit design operates at voltages below 25 V. The significantly higher Idss (40 mA vs. 5 mA) requires circuit verification.

Q: What is the difference between TO-92-3 and SOT-23-3 packages? A: TO-92-3 is a through-hole package with formed leads for PCB insertion. SOT-23-3 is a surface-mount package requiring reflow soldering. Pin functions are equivalent, but PCB layout and assembly processes differ significantly.

Q: Can I use J211-D74Z as a substitute? A: J211-D74Z is electrically compatible in TO-92-3 package form. However, detailed electrical parameters (RDS(On), VGS(off)) are not specified in available data. Use only when complete parameter matching is not critical to circuit operation.

Q: Which substitute offers the best performance improvement? A: J112-D74Z provides the best overall performance improvement with higher voltage rating (35 V), lower on-resistance (50 Ω), and higher power dissipation capability (625 mW), while maintaining identical Idss characteristics and TO-92-3 package compatibility.

Q: Are all substitutes ROHS3 compliant? A: J112-D74Z, J109-D26Z, J211-D74Z, and MMBF4393LT1G are all ROHS3 compliant. The original MPF4393RLRPG is classified as obsolete and does not carry ROHS3 certification.