MMFTN138 Equivalent & Substitute Parts Reference

Part Overview

The MMFTN138 is an N-Channel MOSFET with a 50 V drain-source voltage and a continuous drain current rating of 220mA (Ta), offered in a SOT-23-3 (TO-236) surface mount package. This active model is sourced from Diotec Semiconductor and belongs to the Transistors, FETs, MOSFETs category. Identifying substitute and equivalent models is necessary for supply chain flexibility, multisourcing, and maintenance, particularly when inventory constraints or compliance requirements arise.

Key Parameters

Parameter	Value
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	50 V
Current - Continuous Drain (Id) @ 25°C	220mA (Ta)
Drive Voltage (Max Rds On, Min Rds On)	4.5V, 10V
Rds On (Max) @ Id, Vgs	3.5Ohm @ 220mA, 10V
Vgs(th) (Max) @ Id	1.6V @ 1mA
Vgs (Max)	±20V
Input Capacitance (Ciss) (Max) @ Vds	60 pF @ 25 V
Power Dissipation (Max)	360mW (Ta)
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Supplier Device Package	SOT-23-3 (TO-236)
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	Not applicable
Moisture Sensitivity Level (MSL)	Not Applicable
Product Status	Active
ECCN	EAR99
HTSUS	8541.21.0095

Substitute Part Grouping Explanation

Substitute parts for the MMFTN138 are selected strictly based on the following explicit parameters: FET Type (N-Channel), Technology (MOSFET), Drain to Source Voltage (Vdss), Continuous Drain Current (Id), Rds On, Drive Voltage, Gate Threshold Voltage (Vgs(th)), Maximum Gate-Source Voltage (Vgs Max), Input Capacitance (Ciss), Power Dissipation, Operating Temperature, Mounting Type, Device Package, RoHS Status, Moisture Sensitivity Level (MSL), Product Status, ECCN, and HTSUS. Only parts matching these electrical, mechanical, and compliance characteristics are considered equivalent or substitutes.

Parameter Comparison

Parameter	MMFTN138 (Diotec Semiconductor)	BSS138LT1G (onsemi)
FET Type	N-Channel	N-Channel
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	50 V	50 V
Current - Continuous Drain (Id) @ 25°C	220mA (Ta)	200mA (Ta)
Drive Voltage (Max Rds On, Min Rds On)	4.5V, 10V	5V
Rds On (Max) @ Id, Vgs	3.5Ohm @ 220mA, 10V	3.5Ohm @ 200mA, 5V
Vgs(th) (Max) @ Id	1.6V @ 1mA	1.5V @ 1mA
Vgs (Max)	±20V	±20V
Input Capacitance (Ciss) (Max) @ Vds	60 pF @ 25 V	50 pF @ 25 V
Power Dissipation (Max)	360mW (Ta)	225mW (Ta)
Operating Temperature	150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	SOT-23-3 (TO-236)	SOT-23-3 (TO-236)
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	Not applicable	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Not Applicable	1 (Unlimited)
Product Status	Active	Active
ECCN	EAR99	EAR99
HTSUS	8541.21.0095	8541.21.0095

Engineering Selection Recommendations

MMFTN138 from Diotec Semiconductor and BSS138LT1G from onsemi both have an "Active" product status. RoHS status differs: MMFTN138 is "Not applicable," while BSS138LT1G is "ROHS3 Compliant." Moisture Sensitivity Level is specified as "Not Applicable" for MMFTN138 and "1 (Unlimited)" for BSS138LT1G. Both devices are classified under ECCN EAR99 and HTSUS 8541.21.0095. Selection can be based on matching compliance, inventory requirements, and available certifications as documented in the input parameters.

Frequently Asked Questions (FAQ)

Q1: What are the primary criteria for substituting MMFTN138 with BSS138LT1G?
A1: The main criteria are matching FET type, technology, Drain to Source Voltage (Vdss), Rds On, continuous drain current rating, drive/gate characteristics, package, and compliance parameters.

Q2: Are there mechanical or packaging considerations when selecting these MOSFETs?
A2: Both MMFTN138 and BSS138LT1G are supplied in the SOT-23-3 (TO-236) surface mount package, supporting direct mechanical interchangeability when the same footprint is required.

Q3: How does RoHS status affect substitution?
A3: MMFTN138 lists RoHS status as "Not applicable," while BSS138LT1G is "ROHS3 Compliant." Selection must consider required environmental compliance for the application.

Q4: Are there differences in moisture sensitivity levels (MSL)?
A4: MMFTN138 is specified as "Not Applicable" for MSL, while BSS138LT1G is "1 (Unlimited)," which indicates unlimited shelf life under specified conditions. Review manufacturing requirements as per the provided MSL information.

Q5: Can BSS138LT1G fully substitute for MMFTN138 in terms of electrical rating?
A5: Substitution is based on matching FET type, voltage, current rating, Rds On, and package as explicitly noted in provided parameters. Continuous drain current and power dissipation figures must be considered according to application requirements and the stated specifications.

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