MMBF4118 Equivalent & Substitute Parts

Part Overview

The MMBF4118 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 40 V with a power dissipation rating of 225 mW and an operating temperature range of -55°C to 150°C. The MMBF4118 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and component procurement.

Substiute Parts

MMBF4118

onsemiIn Stock: 16938MMBF4118 Datasheet

Current PartRFQ

2SK545-11D-TB-E

onsemiIn Stock: 7142SK545-11D-TB-E Datasheet

SimilarRFQ

2SK209-GR(TE85L,F)

Toshiba Semiconductor and StorageIn Stock: 22122SK209-GR(TE85L,F) Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MMBF4118 are identified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Parameters:

• FET Type: N-Channel configuration
• Package / Case: SOT-23-3 (mechanical compatibility)
• Voltage - Breakdown (V(BR)GSS): Equal to or greater than 40 V
• Power - Max: Equal to or greater than 225 mW
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Identified Substitute Parts:

1. 2SK545-11D-TB-E (onsemi): Meets core electrical parameters with 40 V breakdown voltage and 125 mW power rating. Operates in SOT-23-3 package. Classified as obsolete.

2. 2SK209-GR(TE85L,F) (Toshiba Semiconductor and Storage): Exceeds electrical specifications with 50 V breakdown voltage and 150 mW power rating. Operates in SC-59 package (equivalent to SOT-23-3). Classified as active product status.

Parameter Comparison

Engineering Selection Recommendations

2SK545-11D-TB-E Selection Criteria: This substitute maintains electrical parity with the MMBF4118 at 40 V breakdown voltage and operates within the same SOT-23-3 package envelope. Both devices are ROHS3 compliant with MSL 1 rating. However, the 2SK545-11D-TB-E is classified as obsolete, presenting the same long-term availability constraints as the original part.

2SK209-GR(TE85L,F) Selection Criteria: This substitute provides enhanced electrical specifications with 50 V breakdown voltage, exceeding the MMBF4118 requirement. The device is classified as active product status, ensuring continued availability and manufacturing support. The SC-59 package is mechanically equivalent to SOT-23-3. ROHS3 compliance and MSL 1 rating match the original specification. The 2SK209-GR(TE85L,F) is suitable for applications where the MMBF4118 is no longer procurable and where the higher drain current (14 mA versus 80 µA) does not present circuit constraints.

Frequently Asked Questions (FAQ)

Q: Can the 2SK545-11D-TB-E be used as a direct replacement for the MMBF4118?

A: The 2SK545-11D-TB-E shares identical breakdown voltage (40 V) and package configuration (SOT-23-3), making it electrically and mechanically compatible. However, both devices are classified as obsolete, so this substitution does not resolve long-term procurement challenges.

Q: What are the key differences between the 2SK209-GR(TE85L,F) and the MMBF4118?

A: The 2SK209-GR(TE85L,F) operates at 50 V breakdown voltage compared to 40 V for the MMBF4118, providing additional voltage margin. The drain current (Idss) is significantly higher at 14 mA versus 80 µA. The SC-59 package is mechanically equivalent to SOT-23-3. The 2SK209-GR(TE85L,F) is active product status, ensuring ongoing availability.

Q: Are package differences between SOT-23-3 and SC-59 significant for PCB layout?

A: SOT-23-3 and SC-59 are mechanically equivalent packages with identical pin configurations and footprints. No PCB layout modifications are required when substituting between these package designations.

Q: Do all substitute parts meet RoHS and MSL requirements?

A: Yes. Both the 2SK545-11D-TB-E and 2SK209-GR(TE85L,F) are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the MMBF4118 specification.

Q: Which substitute is recommended for new designs?

A: The 2SK209-GR(TE85L,F) is recommended due to active product status, ensuring long-term availability and manufacturing support. The higher drain current and voltage rating provide design margin for most applications.