MMBF4391LT1 Equivalent & Substitute Parts

Part Overview

The MMBF4391LT1 is a JFET single-channel N-type transistor rated for 30V operation in a SOT-23 surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The MMBF4391LT1G serves as the direct functional equivalent with improved availability and active product status.

Substiute Parts

MMBF4391LT1

onsemiIn Stock: 1632MMBF4391LT1 Datasheet

Current PartRFQ

MMBF4391LT1G

onsemiIn Stock: 54550MMBF4391LT1G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBF4391LT1 is determined by electrical and mechanical parameter alignment across the following criteria:

• Drain to Source Voltage (Vdss): 30 V maximum rating
• Drain current characteristics (Idss): 50 mA @ 15 V
• Gate-source cutoff voltage (VGS off): 4 V @ 10 nA
• Power dissipation capability: 225 mW
• Operating temperature range: -55°C to 150°C
• Package configuration: SOT-23-3 (TO-236) surface mount

The MMBF4391LT1G meets all specified electrical parameters and maintains identical package geometry, establishing it as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The MMBF4391LT1G is the appropriate substitute for the obsolete MMBF4391LT1. Both components are manufactured by onsemi and share identical electrical specifications and package geometry. The MMBF4391LT1G maintains active product status with established supply chain availability. Additionally, the MMBF4391LT1G carries ROHS3 compliance, providing regulatory advantage for new designs and production environments requiring RoHS adherence. Both parts maintain equivalent moisture sensitivity and REACH compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can MMBF4391LT1G be used as a direct replacement for MMBF4391LT1?

A: Yes. Both components share identical electrical parameters (Vdss, Idss, VGS off, power rating, and operating temperature range) and are housed in the same SOT-23-3 package. No circuit modifications are required.

Q: What is the primary advantage of switching to MMBF4391LT1G?

A: The MMBF4391LT1G carries active product status with established inventory availability, whereas the MMBF4391LT1 is obsolete. The MMBF4391LT1G also provides ROHS3 compliance for regulatory requirements.

Q: Are there any package or pinout differences between these parts?

A: No. Both components use the SOT-23-3 (TO-236) surface mount package with identical pinout and mechanical dimensions.

Q: Do these parts require different handling or storage procedures?

A: No. Both components share Moisture Sensitivity Level 1 (Unlimited), indicating equivalent handling and storage requirements.

Q: Can circuit board layouts designed for MMBF4391LT1 be used without modification for MMBF4391LT1G?

A: Yes. Identical package geometry and pinout allow direct PCB layout reuse without modification.