FMMT415TC Equivalent & Substitute Parts

Part Overview

The FMMT415TC is a Surface Mount NPN Avalanche Mode Bipolar Junction Transistor manufactured by Diodes Incorporated. This device is rated for 100 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 330 mW power dissipation in a SOT-23-3 package. The FMMT415TC is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	FMMT415TC
Manufacturer	Diodes Incorporated
Transistor Type	NPN - Avalanche Mode
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	500 mA
Power - Max	330 mW
Frequency - Transition	40 MHz
Vce Saturation (Max)	500 mV @ 1 mA, 10 mA
DC Current Gain (hFE) (Min)	25 @ 10 mA, 10 V
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FMMT415TC is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Voltage - Collector Emitter Breakdown: Equal to or greater than 100 V
Current - Collector (Ic) (Max): Equal to or greater than 500 mA
Power - Max: Equal to or greater than 330 mW
Operating Temperature Range: Minimum -55°C to 150°C

Parametric Equivalents maintain identical electrical specifications and are direct replacements within the same product line.

Manufacturer Recommended Substitutes provide equivalent or enhanced performance characteristics while maintaining SOT-23-3 package compatibility and surface mount configuration. These parts may exceed the original specifications in voltage, current, or frequency ratings.

Parameter Comparison

Parameter	FMMT415TC	FMMT415TD	FMMT417TD	BCX41E6327HTSA1	FJV1845FMTF	MMBT2484LT1G	MMBT2484LT3G	MMBT6429LT1G
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Infineon	onsemi	onsemi	onsemi	onsemi
Transistor Type	NPN - Avalanche Mode	NPN - Avalanche Mode	NPN - Avalanche Mode	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	125 V	120 V	60 V	60 V	45 V
Current - Collector (Ic) (Max)	500 mA	500 mA	500 mA	800 mA	50 mA	100 mA	100 mA	200 mA
Power - Max	330 mW	330 mW	330 mW	330 mW	300 mW	225 mW	225 mW	225 mW
Frequency - Transition	40 MHz	40 MHz	40 MHz	100 MHz	110 MHz	—	—	700 MHz
Vce Saturation (Max)	500 mV @ 1 mA, 10 mA	500 mV @ 1 mA, 10 mA	500 mV @ 1 mA, 10 mA	900 mV @ 30 mA, 300 mA	300 mV @ 1 mA, 10 mA	350 mV @ 100 µA, 1 mA	350 mV @ 100 µA, 1 mA	600 mV @ 5 mA, 100 mA
DC Current Gain (hFE) (Min)	25 @ 10 mA, 10 V	25 @ 10 mA, 10 V	25 @ 10 mA, 10 V	40 @ 200 mA, 1 V	300 @ 1 mA, 6 V	250 @ 1 mA, 5 V	250 @ 1 mA, 5 V	500 @ 100 µA, 5 V
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	150°C	150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

FMMT415TD and FMMT417TD are parametric equivalents of the FMMT415TC. Both devices maintain identical electrical specifications including 100 V breakdown voltage, 500 mA maximum collector current, 330 mW power dissipation, and 40 MHz transition frequency. Both are Active products manufactured by Diodes Incorporated in SOT-23-3 packages. FMMT415TD is available in Tape & Reel packaging, while FMMT417TD is supplied in Cut Tape & Digi-Reel format. These parts are ROHS3 compliant and suitable for direct substitution in applications requiring the original FMMT415TC specifications.

Manufacturer Recommended Substitutes:

BCX41E6327HTSA1 (Infineon Technologies) exceeds the original specifications with 125 V breakdown voltage, 800 mA maximum collector current, and 100 MHz transition frequency. This part is classified as Last Time Buy and maintains SOT-23-3 package compatibility. The enhanced current and voltage ratings provide design margin for applications requiring higher performance.

FJV1845FMTF (onsemi) is rated for 120 V breakdown voltage with 50 mA maximum collector current and 110 MHz transition frequency. This device is suitable for applications where collector current requirements are lower than the original 500 mA specification.

MMBT2484LT1G and MMBT2484LT3G (onsemi) are rated for 60 V breakdown voltage with 100 mA maximum collector current. These parts are suitable for applications with reduced voltage and current requirements. MMBT2484LT1G is supplied in Cut Tape & Digi-Reel format, while MMBT2484LT3G is available in Tape & Reel packaging.

MMBT6429LT1G (onsemi) is rated for 45 V breakdown voltage with 200 mA maximum collector current and 700 MHz transition frequency. This device is suitable for high-frequency applications with reduced voltage requirements.

All substitute parts are ROHS3 compliant, MSL Level 1, and maintain surface mount SOT-23-3 package compatibility with the original FMMT415TC.

Frequently Asked Questions (FAQ)

Q: Can FMMT415TD be used as a direct replacement for FMMT415TC?

A: Yes. FMMT415TD is a parametric equivalent with identical electrical specifications. The primary difference is product status: FMMT415TC is Obsolete while FMMT415TD is Active. Both devices are manufactured by Diodes Incorporated with matching 100 V breakdown voltage, 500 mA collector current, and 330 mW power dissipation in SOT-23-3 packages.

Q: What is the difference between FMMT415TD and FMMT417TD?

A: Both are parametric equivalents with identical electrical specifications. The difference is packaging format: FMMT415TD is supplied in Tape & Reel (TR), while FMMT417TD is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Can BCX41E6327HTSA1 replace FMMT415TC in all applications?

A: BCX41E6327HTSA1 exceeds the original specifications with higher voltage (125 V vs. 100 V), higher current (800 mA vs. 500 mA), and higher frequency (100 MHz vs. 40 MHz). It is suitable for applications where the original specifications are met, but the higher ratings provide additional design margin. BCX41E6327HTSA1 is classified as Last Time Buy, indicating limited future availability.

Q: Are MMBT2484LT1G and MMBT2484LT3G interchangeable?

A: Yes, electrically. Both parts have identical specifications with 60 V breakdown voltage, 100 mA collector current, and 225 mW power dissipation. The difference is packaging: MMBT2484LT1G is Cut Tape & Digi-Reel format, while MMBT2484LT3G is Tape & Reel format. Selection depends on assembly process requirements.

Q: Can MMBT6429LT1G be used in place of FMMT415TC?

A: MMBT6429LT1G has reduced voltage (45 V vs. 100 V) and current (200 mA vs. 500 mA) ratings compared to FMMT415TC. It is suitable only for applications where the circuit operates within these lower specifications. The higher transition frequency (700 MHz vs. 40 MHz) may provide benefits in high-frequency applications.

Q: What does "Avalanche Mode" mean in the FMMT415TC specification?

A: Avalanche Mode indicates the transistor is designed to operate in avalanche breakdown conditions, providing protection against voltage transients. FMMT415TC and FMMT417TD both feature this capability. Other substitute parts (BCX41E6327HTSA1, FJV1845FMTF, MMBT series) do not specify avalanche mode operation and may not provide equivalent transient protection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and suitable for applications requiring RoHS compliance. All parts also maintain MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of the SOT-23-3 package specification?

A: SOT-23-3 is the surface mount package format for all listed parts. This ensures mechanical and electrical compatibility with PCB layouts designed for FMMT415TC. All substitute parts maintain this package specification, allowing direct board-level substitution without layout modifications.

Q: Why is FMMT415TC classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. FMMT415TD and FMMT417TD are Active equivalents from the same manufacturer and should be used for new designs and ongoing procurement.

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